{"id":989,"date":"2020-11-17T11:24:59","date_gmt":"2020-11-17T11:24:59","guid":{"rendered":"https:\/\/wordpress.peters-research.com\/?page_id=989"},"modified":"2020-11-17T11:29:07","modified_gmt":"2020-11-17T11:29:07","slug":"green-lift-control-strategies-2","status":"publish","type":"page","link":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/","title":{"rendered":"Green Lift Control Strategies"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"989\" class=\"elementor elementor-989\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-2bd44fca elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"41311\" data-id=\"2bd44fca\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-691f4c74\" data-eae-slider=\"43698\" data-id=\"691f4c74\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1907e04f elementor-widget elementor-widget-text-editor\" data-id=\"1907e04f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"457\" class=\"elementor elementor-457\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-18f9bc28 elementor-section-full_width elementor-section-content-middle elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"16505\" data-id=\"18f9bc28\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-3e31ad68\" data-eae-slider=\"10199\" data-id=\"3e31ad68\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-72297194 elementor-widget elementor-widget-image\" data-id=\"72297194\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"\/index.php\">\n\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/wp-content\/uploads\/elementor\/thumbs\/grey-back-or3ftrbi74b1izha3jb4hu9squmw6mk92kpjh3js9i.png\" title=\"grey back\" alt=\"grey back\" class=\"elementor-animation-grow\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-3d4ddb8c\" data-eae-slider=\"51967\" data-id=\"3d4ddb8c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6f55fd7f elementor-widget elementor-widget-spacer\" data-id=\"6f55fd7f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-161f74d elementor-hidden-desktop elementor-hidden-tablet hfe-menu-item-space-between hfe-submenu-icon-arrow hfe-link-redirect-child elementor-widget elementor-widget-navigation-menu\" data-id=\"161f74d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;hamburger_align&quot;:&quot;center&quot;,&quot;hamburger_menu_align&quot;:&quot;space-between&quot;,&quot;width_flyout_menu_item&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:300,&quot;sizes&quot;:[]},&quot;width_flyout_menu_item_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;width_flyout_menu_item_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_flyout_menu_item&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:30,&quot;sizes&quot;:[]},&quot;padding_flyout_menu_item_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_flyout_menu_item_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_horizontal_menu_item&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:15,&quot;sizes&quot;:[]},&quot;padding_horizontal_menu_item_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_horizontal_menu_item_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_vertical_menu_item&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:15,&quot;sizes&quot;:[]},&quot;padding_vertical_menu_item_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_vertical_menu_item_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;menu_space_between&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;menu_space_between_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;menu_space_between_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;menu_top_space&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;menu_top_space_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;menu_top_space_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;dropdown_border_radius&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;dropdown_border_radius_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;dropdown_border_radius_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;top&quot;:&quot;&quot;,&quot;right&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;left&quot;:&quot;&quot;,&quot;isLinked&quot;:true},&quot;padding_horizontal_dropdown_item&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_horizontal_dropdown_item_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_horizontal_dropdown_item_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_vertical_dropdown_item&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:15,&quot;sizes&quot;:[]},&quot;padding_vertical_dropdown_item_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;padding_vertical_dropdown_item_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_size&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_size_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_size_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_border_width&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_border_width_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_border_width_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_border_radius&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_border_radius_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;toggle_border_radius_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;close_flyout_size&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;close_flyout_size_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;close_flyout_size_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"navigation-menu.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"hfe-nav-menu__toggle elementor-clickable hfe-flyout-trigger\" tabindex=\"0\" role=\"button\" aria-label=\"Menu Toggle\">\n\t\t\t\t\t<div class=\"hfe-nav-menu-icon\">\n\t\t\t\t\t\t<i aria-hidden=\"true\" tabindex=\"0\" class=\"fas fa-align-justify\"><\/i>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<div class=\"hfe-flyout-wrapper\" >\n\t\t\t\t<div class=\"hfe-flyout-overlay elementor-clickable\"><\/div>\n\t\t\t\t<div class=\"hfe-flyout-container\">\n\t\t\t\t\t<div id=\"hfe-flyout-content-id-161f74d\" class=\"hfe-side hfe-flyout-left hfe-flyout-open\" data-layout=\"left\" data-flyout-type=\"normal\">\n\t\t\t\t\t\t<div class=\"hfe-flyout-content push\">\n\t\t\t\t\t\t\t<nav >\n\t\t\t\t\t\t\t\t<ul id=\"menu-1-161f74d\" class=\"hfe-nav-menu\"><li id=\"menu-item-39\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-home parent hfe-creative-menu\"><a href=\"https:\/\/wordpress.peters-research.com\/\" class = \"hfe-menu-item\">Home<\/a><\/li>\n<li id=\"menu-item-697\" class=\"menu-item menu-item-type-post_type menu-item-object-page parent hfe-creative-menu\"><a href=\"https:\/\/wordpress.peters-research.com\/index.php\/products-services\/\" class = \"hfe-menu-item\">Products and Services<\/a><\/li>\n<li id=\"menu-item-698\" class=\"menu-item menu-item-type-post_type menu-item-object-page parent hfe-creative-menu\"><a href=\"https:\/\/wordpress.peters-research.com\/index.php\/training-support\/\" class = \"hfe-menu-item\">Training and Support<\/a><\/li>\n<li id=\"menu-item-696\" class=\"menu-item menu-item-type-post_type menu-item-object-page parent hfe-creative-menu\"><a href=\"https:\/\/wordpress.peters-research.com\/index.php\/download\/\" class = \"hfe-menu-item\">Download<\/a><\/li>\n<li id=\"menu-item-699\" class=\"menu-item menu-item-type-post_type menu-item-object-page parent hfe-creative-menu\"><a href=\"https:\/\/wordpress.peters-research.com\/index.php\/team\/\" class = \"hfe-menu-item\">About us<\/a><\/li>\n<li id=\"menu-item-700\" class=\"menu-item menu-item-type-custom menu-item-object-custom parent hfe-creative-menu\"><a href=\"https:\/\/store.peters-research.com\/\" class = \"hfe-menu-item\">Store<\/a><\/li>\n<\/ul>\t\t\t\t\t\t\t<\/nav>\n\t\t\t\t\t\t\t<div class=\"elementor-clickable hfe-flyout-close\" tabindex=\"0\">\n\t\t\t\t\t\t\t\t<i aria-hidden=\"true\" tabindex=\"0\" class=\"far fa-window-close\"><\/i>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-2e467c1\" data-eae-slider=\"79922\" data-id=\"2e467c1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-56f0c74 elementor-align-center animated-fast elementor-hidden-phone elementor-invisible elementor-widget elementor-widget-button\" data-id=\"56f0c74\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;,&quot;_animation_delay&quot;:0}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xl elementor-animation-grow\" href=\"\/index.php\/products-services\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Products &amp; Services\u200b<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-ee5d266\" data-eae-slider=\"67012\" data-id=\"ee5d266\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7dc6c8fc elementor-align-center animated-fast elementor-hidden-phone elementor-invisible elementor-widget elementor-widget-button\" data-id=\"7dc6c8fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;,&quot;_animation_delay&quot;:0}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xl elementor-animation-grow\" href=\"\/index.php\/training-support\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Training &amp; Support\u200b<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-4df95089\" data-eae-slider=\"27502\" data-id=\"4df95089\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-22f993ce elementor-align-center animated-fast elementor-hidden-phone elementor-invisible elementor-widget elementor-widget-button\" data-id=\"22f993ce\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;,&quot;_animation_delay&quot;:0}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xl elementor-animation-grow\" href=\"\/index.php\/download\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Download\u200b<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-787805\" data-eae-slider=\"71612\" data-id=\"787805\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6b4aaf05 elementor-align-center animated-fast elementor-hidden-phone elementor-invisible elementor-widget elementor-widget-button\" data-id=\"6b4aaf05\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;,&quot;_animation_delay&quot;:0}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xl elementor-animation-grow\" href=\"\/index.php\/team\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">About Us<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-14 elementor-inner-column elementor-element elementor-element-16d52443\" data-eae-slider=\"11386\" data-id=\"16d52443\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-31529b70 elementor-align-center animated-fast elementor-hidden-phone elementor-invisible elementor-widget elementor-widget-button\" data-id=\"31529b70\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;,&quot;_animation_delay&quot;:0}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xl elementor-animation-grow\" href=\"https:\/\/store.peters-research.com\/\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Store\u200b<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-45d24470 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"28038\" data-id=\"45d24470\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-48487994\" data-eae-slider=\"6189\" data-id=\"48487994\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-624c56e elementor-widget elementor-widget-heading\" data-id=\"624c56e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Green Lift Control Strategies\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-550f1783 elementor-widget elementor-widget-text-editor\" data-id=\"550f1783\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Richard Peters, Peters Research Ltd and Brunel University<br \/>Pratap Mehta, Brunel University<\/p><p><em>This paper was published\u00a0in the International Journal of Elevator Engineers. Volume\u00a02 (1998).\u00a0<\/em><em>It is reproduced with permission from The International Assocication of Elevator Engineers.\u00a0<\/em><em>This web version \u00a9 Peters Research Ltd 2009.<\/em><\/p><h3>Abstract<\/h3><p>In general terms, green lifts are lifts with a low energy consumption.\u00a0 The energy consumption of a lift installation is a function of many variables ranging from the accessibility of the stairs to the type of lift drive selected.\u00a0 One variable is the strategies implemented by the lift control system,\u00a0 i.e. the choices the lift system makes in deciding how the lifts respond to passenger landing and car calls.\u00a0 This paper outlines various lift control strategies which result in a reduction in energy consumption.\u00a0 Improvements are measured using an object oriented lift simulation program which has been developed to test these strategies.<\/p><h3><br \/>Introduction<\/h3><p>Peters [1] has demonstrated that the dominating environmental burdens of lifts are the non-renewable resources depleted, the waste created and the emissions generated through the production of electricity for operation of the lifts while in use.<\/p><p>Buildings account for about a third of the energy we consume.\u00a0 Lifts are not the largest energy users in buildings, but they are significant enough (4% to 10% of electrical load) to warrant energy saving measures; a typical office four lift installation consumes in the region of 300kWh per working day.\u00a0 Each time someone takes a lift, they contribute to the generation of greenhouse gasses, which evidence suggests is leading to damaging environmental effects such global warming.\u00a0 If we can reduce the causes of these effects, we should do so.\u00a0 Apart from environmental concerns, the financial cost of the electricity used by lifts is a major incentive for adopting energy saving designs.<\/p><p>The energy consumption of a lift installation is a function of many variables ranging from the accessibility of the stairs to the type of lift drive selected.\u00a0\u00a0 In this paper we discuss some of these variables.\u00a0 Having established the basis for a green lift installation, various lift control strategies are outlined which result in a further reduction in energy consumption.<\/p><p>Improvements in energy consumption achieved by the green lift control strategies are measured using an object oriented lift simulation program that has been developed to test the strategies.\u00a0 The program introduces passengers as they arrive at the lift lobby, then simulates the operation of the lifts and the energy consumption of the lift drives as the passengers are transported.<\/p><h3><br \/>Basis for green lift installation<\/h3><p>There is limited value in developing green lift control strategies if other aspects of the installation are not specified with energy conservation in mind.\u00a0 The following issues need to be considered by the designer.<\/p><h4><br \/>Lift drives<\/h4><p>Hydraulic lifts are energy inefficient in comparison with electric lifts.\u00a0 In his site measurements, Doorlaard [2] concluded that\u00a0<em>the energy consumption of hydraulic lifts travelling at the same nominal speed is over two times the consumption of conventional two-speed lifts.<\/em>\u00a0Hydraulic lifts do have benefits (e.g. low structural building load, flexible motor room position, low capital cost).\u00a0 But they are not green.<\/p><p>Lift manufactures offer a wide range of electric lift drives ranging from single speed AC machines to variable speed AC and DC machines.\u00a0 A summary of these drives and their applications is given by Peters [3].\u00a0 Their energy efficiencies vary significantly.\u00a0 The most efficient electric lift drives are the modern fully controlled static converter DC and variable voltage variable frequency AC drives (including vector control drives); the AC drives provide better power factor control.<\/p><p>Green lift drives should be regenerative, i.e. return power to the mains when delivering negative torque (braking).\u00a0 The alternative, dissipating the energy in resistors can be doubly wasteful, as the waste heat introduces an additional cooling load in an air conditioned building.\u00a0 Installation of regenerative systems should be co-ordinated with the electrical building services design engineer as additional protection and harmonic filtering may be required.<\/p><h4><br \/>Other installation issues<\/h4><p>The torque, and therefore the energy, required of a motor to accelerate a lift can be reduced if we minimise inertia and other resisting forces.\u00a0\u00a0 All rotating components (gear, brake, sheaths, etc.) and travelling components (lift car, counterweight, finishes, ropes, etc.) contribute to the inertia and to resisting forces in the system.\u00a0 Compared with the conventional worm gear, significant reduction in inertia and higher efficiencies have been demonstrated by Zinke [4] for planetary gears, and by Stawinoga [5] for V-belt drives.<\/p><p>Lift car lighting should use efficient sources and be switched off automatically if a lift is not in use for long periods.<\/p><h4><br \/>Planning issues<\/h4><p>The total energy consumption of the installation is also dependant on planning issues.\u00a0\u00a0 If stairs are accessible, attractive and adjacent to the lifts, there is likely to be a reduction in the use of lifts for short trips.\u00a0 It is also good to avoid over-sizing of lifts, as larger lifts result in greater inertia, larger motors and more energy use.\u00a0 While it is important to design spare handling capacity into a lift installation, over-sizing can be the result of:<\/p><ul><li>poor knowledge of probably traffic flows, leading to \u201csafe\u201d overestimates of required handling capacity.<\/li><li>where traffic analysis suggests small lifts are acceptable, it is common to up-size the lifts selected.\u00a0 For instance, in a new office development where six, eight person lifts meet handling capacity and interval design criteria, ten or thirteen person lifts might be selected as larger lifts are perceived as prestigious.<\/li><\/ul><h3><br \/>Lift simulation program<\/h3><p>The lift simulation program,\u00a0<em>Liftsim<\/em>\u00a0has been developed as a design planning tool, and as development platform for green control strategies.\u00a0 The program has been written using Microsoft Visual C++ (for Windows 95 and Windows NT).\u00a0 C++ is a complex object oriented language, but it produces very fast programs, and easily reusable\/portable code.\u00a0 The object oriented approach encourages the programmer to think in terms of objects (e.g. a lift, a person) rather than subroutines or procedures.\u00a0 This helps break down complex problems into manageable parts that are easy to work with as they represent familiar ideas or components.<\/p><p>The main simulation classes are as follows (a class defines the behaviour of an object):<\/p><ul><li><strong>building<\/strong>\u00a0defines the building in terms of number of stories and story heights.<\/li><li><strong>motion<\/strong>\u00a0implements research by Peters [6] in ideal lift kinematics.\u00a0 Programs using the class can specify the journey distance, rated velocity, etc. and output the current distance travelled, velocity, etc. at any time, t since the journey began.<\/li><li><strong>lift\u00a0<\/strong>defines a lift (rated speed, capacity, floors served, etc.) and its current status (position, speed, load, etc.).\u00a0 The motion class is applied to enable the lift to move according to the selected journey profile.\u00a0 The lift class includes algorithms to allow lifts to answer landing and car calls according to the principles of directional collective control.\u00a0 (Most lift control systems adopt a directional collective control strategy regardless of the complexities of the dispatcher algorithms.)<\/li><li><strong>dispatcher<\/strong>\u00a0defines rules for allocating which lift serves which calls.\u00a0 For fair comparison of the green control strategies, the default dispatcher logic has been based on conventional group control with dynamic sectoring as defined by Barney and Dos Santos [7].<\/li><li><strong>person<\/strong>\u00a0defines a person, what time they arrive at the landing station, where they want to go, their mass, etc.\u00a0 Once the journey is complete, the class provides details about passenger waiting, transit and journey times.\u00a0 Waiting time is calculated as the actual time a prospective passenger waits after registering a landing call (or entering the waiting queue if a call has been registered) until the responding elevator doors begin to open.\u00a0 This definition has been taken from the NEI Vertical Transportation Standards [8].\u00a0 For continuity, transit time is calculated\u00a0 from the time the responding elevator doors begin to open to the time the doors begin to open again at the passenger\u2019s destination.\u00a0 Journey time is the sum of waiting and transit times.<\/li><li><strong>motor<\/strong>\u00a0defines the characteristics of the drive.\u00a0 The class calculates the energy consumption and other characteristics as per research by Peters [3] in motor modelling.\u00a0 The motor model is of a DC six pulse static converter drive.\u00a0 Motor simulation results by So [9] show that other regenerative drives have comparable power consumption profiles, thus it is reasonable to assume that the relative performance of green control strategies will be common to these drives.<\/li><\/ul><p>The user can edit all the system parameters (No of lifts, speeds, floor heights, passenger traffic, choice of dispatcher algorithm, etc.) in Windows based tables\/dialogue boxes.\u00a0 The program is a time slice simulation; it calculates the status (position, speed, etc.) of the lifts, increments the time, then re-calculates, and so on in a loop.\u00a0 On a Pentium PC, simulations run faster than real time using a time slice of 0.01 seconds.<\/p><h3><br \/>Green control systems<\/h3><h4>Definitions<\/h4><p>Barney and Dos Santos [7] define a group supervisory control system as\u00a0<em>a control mechanism to command a group of interconnected lift cars with the aim of improving lift system performance<\/em>.\u00a0 Conventionally this system performance has concerned maximising the handling capacity of the lift system, and minimising passenger waiting and transit times.\u00a0 So [10] provides a review of the increasing advanced control strategies applied by designers in order to realise improved performance in these terms.<\/p><p>It would be counterproductive to ignore conventional system performance criteria as excessive waiting for lifts is very frustrating for passengers.\u00a0 So let us define a green lift control system as a\u00a0<em>group control system that considers conventional measures of system performance<\/em>,\u00a0<em>as well as means to reduce energy consumption<\/em>.\u00a0 In the following subsections we shall consider three strategies that would be appropriate to a green lift control system.<\/p><h4><br \/>Green strategy no.1 &#8211; control of kinematics<\/h4><p>Conventionally lifts have the same maximum velocity, acceleration and jerk (rate of change of acceleration) for every trip.\u00a0 If the system does allow any variation, this is generally pre-set by the lift service engineer or building owner.<\/p><p>Research by Peters [6] in ideal lift kinematics has allowed us to generate, quickly and easily, motion profiles for any input of journey distance, velocity, acceleration and jerk.\u00a0 This allows us to consider control systems that vary all these parameters on line in lift system controllers.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/figure1.gif\" alt=\"\" border=\"0\" \/><\/p><p><strong><em>Figure 1\u00a0\u00a0 Four quadrant operation of lift drive<\/em><\/strong><\/p><p>One reason for varying the lift kinematics could be for energy saving purposes.\u00a0 Indeed simulation results suggest that significant savings can be achieved without a significant overall reduction in performance from the passenger\u2019s prospective. To understand how these savings can be realised, consider:<\/p><p>When a lift leaves the ground floor full of passengers, it is motoring, requiring predominantly positive torque in a positive direction.\u00a0 As passengers are dropped off up the building, the counterweight becomes heavier than the lift, so the motor is providing predominantly negative torque in a positive direction.\u00a0 Similarly for a journey down the building, a negative direction, the motor can be required to deliver both positive and negative torque.\u00a0 Thus the lift motor is said to operate in \u201cfour quadrants\u201d, as represented graphically in Figure 1.<\/p><p>(This well known example of how a lift operates in four quadrants is not the whole story as the required motor torque is a function of not just the static load, but also of the angular acceleration and inertia of the system.\u00a0 Zhou [11] provides equations for calculating how the load torque varies over a lift trip.)<\/p><p>In general terms, reducing the performance of the lift when it is \u201cmotoring\u201d will save energy; just as car driver who moderates his acceleration and breaking saves fuel.\u00a0 Likewise, increasing the performance of a lift when it is \u201cgenerating\u201d will regenerate additional energy.\u00a0 Consequently, we can gain energy in both instances, without an significant overall effect on passenger waiting and transit times.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image006.gif\" alt=\"\" border=\"0\" \/><\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image008.gif\" alt=\"\" border=\"0\" \/><br \/><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image010.gif\" alt=\"\" border=\"0\" \/><\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image012.gif\" alt=\"\" border=\"0\" \/><br \/><strong><em>Figure 2\u00a0\u00a0 Simulation results for green strategy no.1 &#8211; control of kinematics<\/em><\/strong><\/p><p>An algorithm has been developed that tests a range of velocity and acceleration options (ranging \u00b1 20% from rated velocity and acceleration) before the start of each trip.\u00a0 Figure 2 summarises the results of tests for a 10 storey building with 4 lifts.\u00a0 An inter-floor passenger traffic profile has been used.<\/p><p>Results show the % of calls answered or complete in a certain time, e.g. the waiting time graph shows that, for both normal and green systems, approximately 60% of calls are answered within 20 seconds, and 80% of calls are answered within 40 seconds.<\/p><p>In this analysis a 33.4% saving in energy consumption has been achieved using the green strategy.\u00a0 The average journey time has increased by just 1.3 seconds.<\/p><h4>Green strategy no.2 &#8211; reducing the number of stops<\/h4><p>Figure 3 demonstrates the energy consumed by a lift over a single trip (motoring), as presented by Peters[3].\u00a0 The energy consumption peaks during the acceleration phase, and is relatively low once the lift reaches full speed.\u00a0 There is regeneration during the deceleration phase, but this is less in total than the energy expended during the acceleration phase.\u00a0\u00a0 Thus it is reasonable to assume that there will be energy savings if we can transport the same number of passengers, with less stops, but without an increase in the overall distance travelled by the lifts.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image014.gif\" alt=\"\" border=\"0\" \/><br \/><strong><em>Figure 3\u00a0\u00a0 Energy consumed by a lift over a single trip (motoring)<\/em><\/strong><\/p><p>One way to achieve this is by forcing the dispatcher to allocate a landing call to a lift when it is:<\/p><ul><li>already due to stop at that floor for a passenger\u2019s car call, and<\/li><li>travelling in the right direction to serve the landing call.<\/li><\/ul><p>This condition for a \u201cforced\u201d allocation may not occur for some time, e.g. it is unlikely during solely up peak traffic, or during light inter-floor traffic. But most lift systems are likely to benefit from the strategy at some time during their daily cycle.<\/p><p>Figure 4 records the results of a simulation of a 14 storey building with 6 lifts.\u00a0 The traffic profile is based on the beginning of the lunch period in an office building &#8211; down peak traffic to the ground floor, plus inter-floor traffic.<\/p><p>In this case, the \u201cgreen\u201d algorithm implementing the discussed strategy causes a 3.2% reduction in the number of motor starts, leading to a 6.2% reduction in the energy consumption.\u00a0 The waiting time distribution remains very similar, but there is a minor improvement in transit times.\u00a0 The improvement in transit time performance is explicable as the strategy will result in some passengers experiencing less intermediate stops during their journey.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image016.gif\" alt=\"\" border=\"0\" \/><\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image018.gif\" alt=\"\" border=\"0\" \/><br \/><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image020.gif\" alt=\"\" border=\"0\" \/><\/p><p><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image022.gif\" alt=\"\" border=\"0\" \/><\/p><p><strong><em>Figure 4\u00a0\u00a0 Simulation results for green strategy no.2 &#8211; reducing the number of stops<\/em><\/strong><\/p><p>Reducing the number of stops is not a new goal for lift control systems.\u00a0 This is because reducing the number of stops reduces the round trip time, increasing the passenger handling capacity of the lift system, and sometimes the lift performance.\u00a0 Other systems that reduce the number of stops include:<\/p><ul><li>fixed zone systems where lifts are divided into zones to serve groups of floors, e.g. 4 lifts serving ground and levels 1 to 10, 4 lifts serving ground and levels 11 to 20.<\/li><li>dynamic zoning systems, where the dispatcher indicates to the waiting passengers which floors a lift will be serving every round trip, e.g. Channelling as presented by Powell [12].<\/li><li>call allocation systems, as described by Barney and Dos Santos [7], where passengers are required to register their destination (as opposed to direction of travel) at the landing.<\/li><\/ul><p>While these systems do result in less stops, they do not necessarily result in an energy saving as:<\/p><ul><li>the overall distance travelled by the lifts is sometimes greater.<\/li><li>the number, speed, capacity, etc. of the lifts will differ from a corresponding conventional, single zone design.<\/li><\/ul><p>To assign credit for energy saving based on these methods, a designer would need to\u00a0 carry out a direct comparison of alternative schemes for the project in question.<\/p><h4><br \/>Green strategy no.3 &#8211; selective parking policies<\/h4><p>When a lift has answered all its calls and becomes free, it can be \u201cparked\u201d at the floor it last answered a call, or sent to another floor in anticipation of future calls.\u00a0 Barney &amp; Dos Santos [7] describe how re-positioning a free car to a particular floor as part of a parking strategy can improve the overall performance of a lift system.<\/p><p>For instance, consider the morning up peak in an office building where the main passenger traffic flow is from the ground floor to upper floors.\u00a0 In this scenario, the dispatcher can improve system performance by returning free cars to the ground floor, and parking them with their doors closed.\u00a0 When a preceding lift departs from the ground floor, and another is needed, a free lift is available immediately rather than having first to be brought to the ground floor.<\/p><p>Similarly during off-peak traffic, answering a series of calls may leave free lifts poorly positioned to answer future calls.\u00a0 Consequently, lift control systems sometimes apply parking policies to improve performance in these scenarios as well.<\/p><p>From the energy saving viewpoint, we should apply parking policies selectively.\u00a0 Figure 5 summarises the results of the simulation of a fifteen storey building with very light inter-floor traffic.\u00a0 The simulation has been run with and without a parking policy that implements a parking strategy.<\/p><p>The results demonstrate that the parking policy improves performance.\u00a0 The question is whether the improvement in performance justifies that additional energy consumed;\u00a0 in this instance, probably not.\u00a0 Other scenarios will be less clear cut.<\/p><p>Green control systems should place parking calls selectively.\u00a0 This could be achieved by the dispatcher reviewing the potential contribution to system performance of parking calls before deciding whether or not they should be made.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image024.gif\" alt=\"\" border=\"0\" \/><\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image026.gif\" alt=\"\" border=\"0\" \/><\/p><p><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image028.gif\" alt=\"\" border=\"0\" \/><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/image030.gif\" alt=\"\" border=\"0\" \/><\/p><p><strong><em>Figure 5\u00a0\u00a0 Simulation results for green strategy no.3 &#8211; selective parking policies<\/em><\/strong><\/p><h3><br \/>Conclusions<\/h3><p>The use of electricity at current levels is unsustainable, and damaging to our environment.\u00a0 As responsible stewards of the earth, we should be reducing our energy consumption and seeking to develop sustainable energy sources.\u00a0 Lifts are not the largest energy users in building, but are significant enough to warrant energy saving measures.\u00a0 Apart from environmental concerns, the financial cost of the electricity used by lifts is a major incentive for adopting energy saving designs.\u00a0 Energy savings do not necessarily have to result in a significant loss in performance.<\/p><p>Before considering green, energy saving control strategies, there are other aspects of the installation that should be considered. For instance, there is limited value in implementing energy saving lift control strategies if an inappropriate drive is selected.<\/p><p>Given that there is an appropriate basis for a green lift installation, various control strategies can be adopted in order to reduce energy consumption further.\u00a0 In this paper we have discussed strategies involving control of kinematics, reducing number of lift stops, and selective parking policies.<\/p><p>Simulation has demonstrated that each of these strategies will allow green control systems to reduce energy consumption significantly.\u00a0 The magnitude of savings is a function of the installation and traffic flow, so cannot declared absolutely.\u00a0 However, simulation suggests that installations with regenerative drives could achieve additional savings in excess of 30% without a major impact on the overall system performance.<\/p><p><br \/><strong>REFERENCES<\/strong><\/p><ol><li>Peters R D\u00a0 \u201cGreen lifts?\u201d\u00a0 Proceedings of CIBSE National Conference 1994 (The Chartered Institution of Building Services Engineers), Vol. 1, October 1994, pp. 312-321.<\/li><li>Doolaard D A\u00a0 \u201cEnergy consumption by different types of drive system\u201d\u00a0 Elevator Technology 4, Proceedings of ELEVCON\u201992 (The International Association of Elevator Engineers), Vol. 4, May 1992, pp. 77-85.<\/li><li>Peters R D\u00a0 \u201cMathematical modelling of lift drive motion and energy consumption\u201d\u00a0 Proceedings of CIBSE National Conference 1995 (The Chartered Institution of Building Services Engineers), loose leaf insert<\/li><li>Zinke W\u00a0 \u201cPlanetary gear and frequency inverter set new standards in lift drive efficiency\u201d\u00a0 Elevator World, January 1996, pp. 132-135.<\/li><li>Stawinoga R\u00a0 \u201cNew Mechanical Solutions for High Efficiency Gears\u201d\u00a0 Elevator Technology 5, Proceedings of ELEVCON\u201993 (The International Association of Elevator Engineers), November 1993, pp. 193-202.<\/li><li>Peters R D\u00a0 \u201cIdeal Lift Kinematics: Complete Equations for Plotting Optimum Motion\u201d\u00a0 Elevator Technology 6, Proceedings of ELEVCON\u201995 (The International Association of Elevator Engineers),\u00a0 March 1995, pp. 175-184.<\/li><li>Barney G C, Dos Santos S M\u00a0 Elevator Traffic Analysis Design and Control, Peter Peregrinus, London,\u00a0 2nd edition, 1985.<\/li><li>National Elevator Industry Inc., 7th Edition Vertical Transportation Standards, 1994 Supplement.<\/li><li>So A T P\u00a0 \u201cComputer Simulation-based Analysis of Elevator Drive Systems\u201d,\u00a0\u00a0 HKIE Transactions, Vol. 3, 1992, pp. 13-22.<\/li><li>So A T P, Liu S K\u00a0 \u201cAn Overall Review of Advances Elevator Technologies\u201d, Elevator World, June 1996, pp. 96-101.<\/li><li>Zhou T\u00a0 \u201cAnalysis of Motion Equations of Elevator Drive Systems\u201d, Elevator Technology 4, Proceedings of ELEVCON\u201992 (The International Association of Elevator Engineers), May 1992, pp. 306-315.<\/li><li>Powell B A\u00a0\u00a0 \u201cImportant Issues in Up Peak Traffic Handling\u201d\u00a0 Elevator Technology 4, Proceedings of ELEVCON\u201992 (The International Association of Elevator Engineers), May 1992, pp. 207-218.<\/li><\/ol><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Green Lift Control Strategies Richard Peters, Peters Research Ltd and Brunel UniversityPratap Mehta, Brunel University This paper was published\u00a0in the International Journal of Elevator Engineers. Volume\u00a02 (1998).\u00a0It is reproduced with permission from The International Assocication of Elevator Engineers.\u00a0This web version \u00a9 Peters Research Ltd 2009. Abstract In general terms, green lifts are lifts with a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":860,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_canvas","meta":{"footnotes":""},"class_list":["post-989","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Green Lift Control Strategies - Peters Research<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Green Lift Control Strategies - Peters Research\" \/>\n<meta property=\"og:description\" content=\"Green Lift Control Strategies Richard Peters, Peters Research Ltd and Brunel UniversityPratap Mehta, Brunel University This paper was published\u00a0in the International Journal of Elevator Engineers. Volume\u00a02 (1998).\u00a0It is reproduced with permission from The International Assocication of Elevator Engineers.\u00a0This web version \u00a9 Peters Research Ltd 2009. Abstract In general terms, green lifts are lifts with a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Peters Research\" \/>\n<meta property=\"article:modified_time\" content=\"2020-11-17T11:29:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/figure1.gif\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"17 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/\",\"url\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/\",\"name\":\"Green Lift Control Strategies - Peters Research\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/wordpress.peters-research.com\\\/images\\\/stories\\\/papers\\\/greenliftcontrolstrategies\\\/figure1.gif\",\"datePublished\":\"2020-11-17T11:24:59+00:00\",\"dateModified\":\"2020-11-17T11:29:07+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/#primaryimage\",\"url\":\"https:\\\/\\\/wordpress.peters-research.com\\\/images\\\/stories\\\/papers\\\/greenliftcontrolstrategies\\\/figure1.gif\",\"contentUrl\":\"https:\\\/\\\/wordpress.peters-research.com\\\/images\\\/stories\\\/papers\\\/greenliftcontrolstrategies\\\/figure1.gif\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/green-lift-control-strategies-2\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/wordpress.peters-research.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Papers\",\"item\":\"https:\\\/\\\/wordpress.peters-research.com\\\/index.php\\\/papers\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Green Lift Control Strategies\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/#website\",\"url\":\"https:\\\/\\\/wordpress.peters-research.com\\\/\",\"name\":\"Peters Research Ltd Devlopment\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/wordpress.peters-research.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-GB\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/#organization\",\"name\":\"Peters Research Ltd\",\"url\":\"https:\\\/\\\/wordpress.peters-research.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/wordpress.peters-research.com\\\/wp-content\\\/uploads\\\/2020\\\/06\\\/cropped-peters_research-logo-white-small.png\",\"contentUrl\":\"https:\\\/\\\/wordpress.peters-research.com\\\/wp-content\\\/uploads\\\/2020\\\/06\\\/cropped-peters_research-logo-white-small.png\",\"width\":1519,\"height\":669,\"caption\":\"Peters Research Ltd\"},\"image\":{\"@id\":\"https:\\\/\\\/wordpress.peters-research.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Green Lift Control Strategies - Peters Research","robots":{"index":"noindex","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"og_locale":"en_GB","og_type":"article","og_title":"Green Lift Control Strategies - Peters Research","og_description":"Green Lift Control Strategies Richard Peters, Peters Research Ltd and Brunel UniversityPratap Mehta, Brunel University This paper was published\u00a0in the International Journal of Elevator Engineers. Volume\u00a02 (1998).\u00a0It is reproduced with permission from The International Assocication of Elevator Engineers.\u00a0This web version \u00a9 Peters Research Ltd 2009. Abstract In general terms, green lifts are lifts with a [&hellip;]","og_url":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/","og_site_name":"Peters Research","article_modified_time":"2020-11-17T11:29:07+00:00","og_image":[{"url":"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/figure1.gif","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_misc":{"Estimated reading time":"17 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/","url":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/","name":"Green Lift Control Strategies - Peters Research","isPartOf":{"@id":"https:\/\/wordpress.peters-research.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/#primaryimage"},"image":{"@id":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/#primaryimage"},"thumbnailUrl":"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/figure1.gif","datePublished":"2020-11-17T11:24:59+00:00","dateModified":"2020-11-17T11:29:07+00:00","breadcrumb":{"@id":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/#primaryimage","url":"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/figure1.gif","contentUrl":"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/greenliftcontrolstrategies\/figure1.gif"},{"@type":"BreadcrumbList","@id":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/green-lift-control-strategies-2\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/wordpress.peters-research.com\/"},{"@type":"ListItem","position":2,"name":"Papers","item":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/"},{"@type":"ListItem","position":3,"name":"Green Lift Control Strategies"}]},{"@type":"WebSite","@id":"https:\/\/wordpress.peters-research.com\/#website","url":"https:\/\/wordpress.peters-research.com\/","name":"Peters Research Ltd Devlopment","description":"","publisher":{"@id":"https:\/\/wordpress.peters-research.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/wordpress.peters-research.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-GB"},{"@type":"Organization","@id":"https:\/\/wordpress.peters-research.com\/#organization","name":"Peters Research Ltd","url":"https:\/\/wordpress.peters-research.com\/","logo":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/wordpress.peters-research.com\/#\/schema\/logo\/image\/","url":"https:\/\/wordpress.peters-research.com\/wp-content\/uploads\/2020\/06\/cropped-peters_research-logo-white-small.png","contentUrl":"https:\/\/wordpress.peters-research.com\/wp-content\/uploads\/2020\/06\/cropped-peters_research-logo-white-small.png","width":1519,"height":669,"caption":"Peters Research Ltd"},"image":{"@id":"https:\/\/wordpress.peters-research.com\/#\/schema\/logo\/image\/"}}]}},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/pages\/989","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/comments?post=989"}],"version-history":[{"count":4,"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/pages\/989\/revisions"}],"predecessor-version":[{"id":1004,"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/pages\/989\/revisions\/1004"}],"up":[{"embeddable":true,"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/pages\/860"}],"wp:attachment":[{"href":"https:\/\/wordpress.peters-research.com\/index.php\/wp-json\/wp\/v2\/media?parent=989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}