{"id":1086,"date":"2020-11-17T11:51:36","date_gmt":"2020-11-17T11:51:36","guid":{"rendered":"https:\/\/wordpress.peters-research.com\/?page_id=1086"},"modified":"2020-11-17T12:12:15","modified_gmt":"2020-11-17T12:12:15","slug":"simulation-for-control-system-design-and-traffic-analysis","status":"publish","type":"page","link":"https:\/\/wordpress.peters-research.com\/index.php\/papers\/simulation-for-control-system-design-and-traffic-analysis\/","title":{"rendered":"Simulation for Control System Design and Traffic Analysis"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1086\" class=\"elementor elementor-1086\">\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=\"70959\" data-id=\"2bd44fca\" data-element_type=\"section\" 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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\">Simulation for Control System Design and Traffic Analysis\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>Dr Richard Peters, Peters Research Ltd<\/p><p><em>This paper was presented at ELEVCON\u00a0ZURICH\u00a01998, The International Congress on Vertical Transportation Technologies\u00a0and first published in the IAEE book &#8220;Elevator Technology 9&#8221;, edited by G. C. Barney.\u00a0 It is reproduced with permission from The International Assocication of Elevator Engineers.\u00a0 The paper was republished by Elevatori January\/February 1999.\u00a0 This web version \u00a9 Peters Research Ltd 2009.<\/em><\/p><h3>Abstract<\/h3><p>Elevate is a development platform for elevator control systems and an advanced elevator traffic analysis tool.\u00a0 The program is written in the C++ language using the latest object oriented programming techniques, and has a Microsoft Windows[TM] user interface.\u00a0 Passengers are generated automatically from arrival rates entered by the user.\u00a0 The elevators answer passenger calls as directed by the selected dispatcher algorithm.\u00a0 An analysis of passenger waiting and transit times is given.\u00a0 Elevate applies research in ideal elevator kinematics giving total control of elevator speed profiles.<\/p><h3><br \/>1.\u00a0\u00a0 Introduction<\/h3><p>Elevate is a development platform for elevator control systems and an advanced elevator traffic analysis tool.\u00a0 Elevate\u2019s features and functions include:<\/p><ul><li>Dynamic simulation providing a visual display of the elevators as they answer passenger landing and car calls.<\/li><li>A Microsoft Windows^ interface.<\/li><li>Advanced traffic analysis tool for planning elevator installations.<\/li><li>Full user control over the inputs to the systems, e.g. number of elevators, speeds, passenger arrival rates.<\/li><li>Standard and Advanced options allowing the user to enter basic information for a quick analysis, or comprehensive data for a detailed model.<\/li><li>Kinematics research applied to generate accurate elevator speed profiles.<\/li><li>Results include graphs of passenger waiting and transit times.<\/li><li>Data and results can be transferred to a spreadsheet for further analysis if required.<\/li><li>Programmed in Microsoft Visual C++ using object oriented technology.<\/li><li>Platform for developing, testing, and demonstrating control systems.<\/li><\/ul><p><br \/><br \/>In this paper we will review how Elevate is designed using object oriented technology, give an overview of its interface, and discuss some applications.<\/p><p>(Windows is a registered trademark of the Microsoft Corporation.)<\/p><h3><br \/>2.\u00a0\u00a0 Object oriented programming<\/h3><p>Traditional structural programming techniques break a program into several smaller tasks by defining a set of functions.\u00a0 Object oriented programming (OOP) builds on structured programming techniques by introducing objects. The variables and functions of an object are defined by the class to which it belongs.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image002.jpg\" alt=\"\" border=\"0\" \/><\/p><p><br \/><em><strong>Figure 1 Ginger the cat graphic from [1]<br \/><\/strong><\/em><br \/>For an example of how OOP is mimicking the real world, consider Ginger the cat in Figure 1.<\/p><p>The world has a class cat.\u00a0 Everything in the cat class has a set of the same variables (no of paws, age, sex, etc.) and a range of functions (if you chase it, it runs; if you pat it, it\u00a0 purrs).\u00a0 \u201cGinger\u201d is an object, and an instance of the cat class.\u00a0 He has all the functions and variables of a cat.<\/p><p>Once a class is defined, its complexities are hidden, so we can create and apply objects simply.\u00a0 In this way OOP helps break down complex problems into manageable parts that are easy to work with as they represent familiar ideas or components.<\/p><p>Applying this approach, consider a circle class with a radius variable r, and functions CalculateArea() and DrawCircle().\u00a0 Here is an extract of a C++ application using the circle class (the functionality of which has been defined elsewhere):<\/p><pre>\/\/(double lines precede comments)<\/pre><pre>\/\/create a circle object, called \u201ccir\u201d with a radius r circle cir(r);<\/pre><pre>\/\/display the circle\u2019s area\u00a0 cout &lt;&lt; \u201cThe area is \u201d &lt;&lt; cir.CalculateArea();<\/pre><pre>\/\/draw the circle on the screen\u00a0 cir.DrawCircle();\u00a0<\/pre><p>Returning to elevators, we can define the class elevator with variables such as capacity and speed, and functions such as StartJourney().\u00a0 We can create as many elevator objects as we need; each elevator object is independent, but may use all the variables and functions defined by the class.<\/p><h3><br \/>3.\u00a0\u00a0 Applying OOP to Elevate<\/h3><p>Elevate has six main classes which it uses to implement a simulation.\u00a0 They are:<\/p><ul><li><strong><em>building<\/em><\/strong>\u00a0The building class defines the building in terms of number of stories and story heights.<\/li><li><strong><em>motion<\/em><\/strong>\u00a0The motion class generates elevator kinematics curves, examples of which are given in Figure 2.\u00a0 To use this class, an \u201celevator\u201d specifies the journey distance, rated velocity, acceleration and jerk;\u00a0 motion outputs the current distance travelled, and velocity at any time, t since the journey began.\u00a0\u00a0\u00a0\u00a0\u00a0<br \/><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image004.gif\" alt=\"\" border=\"0\" \/><br \/><strong><em>Figure 2\u00a0\u00a0 Example velocity curves produces by motion class.<br \/><\/em><\/strong><\/li><li><strong><em>elevator\u00a0<\/em><\/strong>The elevator class defines an elevator (rated speed, capacity, floors served, etc.) and its current status (position, speed, load, etc.).\u00a0 The motion class is applied to enable the elevator to move according to the selected journey profile.\u00a0 The elevator class includes algorithms to allow elevators to answer landing and car calls according to the principles of directional collective control.\u00a0 (Most elevator control systems adopt a directional collective control strategy regardless of the complexities of their dispatcher algorithm.)<\/li><li><strong><em>dispatcher<\/em><\/strong>\u00a0The dispatcher class defines rules for deciding which elevator is to serve each landing call.\u00a0 The standard dispatcher logic has been based on conventional group control with dynamic sectoring as defined by Barney and dos Santos[2].<\/li><li><strong><em>person<\/em><\/strong>\u00a0The person class defines a person, what time he\/she arrives at the landing station, where he\/she wants to go, their mass, etc.\u00a0 Once the journey is complete, the class provides details about passenger waiting and transit times.<\/li><li><strong><em>traffic<\/em><\/strong>\u00a0The traffic class converts user information about the passenger traffic into a corresponding set of person objects.<\/li><\/ul><h3><br \/>4.\u00a0\u00a0 Data entry<\/h3><p>Elevate\u2019s interface is Windows based, and allows the user to edit all the system data in dialog boxes containing standard Windows controls (radio buttons, drop downs, etc.), and a spreadsheet-like control for tabular data entry.\u00a0 The program uses a multi-document interface, so the user can be working on a number of different simulations at the same time.\u00a0 In addition to the standard Windows features (save, print, etc.) there are five data entry dialog boxes which can be accessed via the menus or button bar:<\/p><ul><li><em>Building data<\/em>\u00a0In Building data the user enters floor names and levels.<\/li><li><em>Elevator data<\/em>\u00a0In Elevator\u00a0 data the user enters details about the elevators.\u00a0 The dialog box has two modes.\u00a0 In<br \/>Standard mode only basic information is entered, e.g. number of elevators, capacity, speed; Elevate selects default values for other variables.\u00a0 In Advanced mode, the user can edit all parameters including the acceleration, jerk, motor start delay, and dwell times.<\/li><li><em>Passenger data<\/em>\u00a0In Passenger data the user enters details of the passengers that will be transported by the elevators.\u00a0 Again, there are two modes of operation.\u00a0 In Standard mode the user enters basic information, e.g. a five minute handling capacity and floor populations (as a basis for determining passenger destinations).\u00a0 In Advanced mode the user can define complex traffic flows using arrival rates and destination probabilities.<\/li><li><em>Simulation data<\/em>\u00a0In Simulation data the user can select the control algorithm, time slice, and frequency of the graphical display being updated.<\/li><li><em>Job data\u00a0<\/em>In Job data the user can enter job and calculations titles.<\/li><\/ul><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image006.gif\" alt=\"\" border=\"0\" \/><\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image008.gif\" alt=\"\" border=\"0\" \/><\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image010.gif\" alt=\"\" border=\"0\" \/><br \/><strong><em>Figure 3\u00a0\u00a0 Examples of data entry dialog boxes<br \/><\/em><\/strong><\/p><h3><br \/>5.\u00a0\u00a0 Running the simulation<\/h3><p>The passenger generator uses the traffic class to create passengers (person objects) in software based on the Passenger data entered by the user.<\/p><p>The program then performs a time slice simulation; it calculates the status (position, speed, etc.) of the elevators, increments the time, re-calculates status, increments time, and so on.\u00a0 Provided that there are not too many other demands on the computer\u2019s processor, the simulation will run faster than real time on a Pentium PC using a time slice of 0.01 seconds.<\/p><p>The main area of the screen is used to give a visual display of the simulation as shown in Figure 4. The user can zoom in\/out of this display using buttons on the Toolbar.<\/p><p>\u00a0<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image012.gif\" alt=\"\" border=\"0\" \/><br \/><strong><em>Figure 4\u00a0\u00a0 Simulation display<\/em><\/strong><\/p><p><br \/>Elevators are displayed according to their current position and door status:<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image014.gif\" alt=\"\" border=\"0\" \/>\u00a0Indicates that the elevator\u2019s doors are fully closed.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image016.gif\" alt=\"\" border=\"0\" \/>\u00a0Indicates that the elevator\u2019s doors are opening or closing.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image018.gif\" alt=\"\" border=\"0\" \/>\u00a0Indicates that the elevator\u2019s doors are fully open.<\/p><p><br \/>Landing and car calls are displayed according to their status:<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image020.gif\" alt=\"\" border=\"0\" \/>\u00a0Red arrows indicate which up and down landing calls have been registered by waiting passengers at each floor.<\/p><p><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image022.gif\" alt=\"\" border=\"0\" \/>\u00a0Red squares indicate car calls registered by the passengers travelling in each elevator.\u00a0 Car calls are aligned with the floors for which\u00a0they are registered.<\/p><p>P\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Indicates a parking call used to re-locate an \u201cidle\u201d car (used in up peak algorithms).<\/p><p>The current direction, position, speed and load is displayed above each elevator.\u00a0 The number of passengers queuing is displayed at each floor.<\/p><h3><br \/>6.\u00a0\u00a0 Results<\/h3><p>Once the simulation is complete, a print preview of the data and results are displayed as shown in Figure 5.\u00a0 Results include:<\/p><ul><li>average waiting time, longest waiting time, and a plot of the waiting time distribution.<\/li><li>average transit time, longest transit time, and a plot of transit time distribution.<br \/><br \/><br \/><img decoding=\"async\" src=\"https:\/\/wordpress.peters-research.com\/images\/stories\/papers\/Simulationforcontrolsystemdesign\/image024.gif\" alt=\"\" border=\"0\" \/><br \/><strong><em>Figure 5\u00a0\u00a0 Results displayed on screen<br \/><\/em><\/strong><br \/><br \/>In addition to these results, a file is written to disk that includes details of every passenger generated by Elevate: what time they arrived, at which floor, what was their destination, what were their individual waiting and transit times, etc.\u00a0 This file can be loaded into a spreadsheet for further analysis if required.<\/li><\/ul><h3><br \/>7\u00a0\u00a0 Applications<\/h3><h4>7.1\u00a0\u00a0 Control System Design<\/h4><p>The object oriented nature of Elevate makes it relatively straightforward to design new control systems by revising the dispatch object.<\/p><p>The dispatch object has to review new landing calls, and allocate them to an appropriate elevator.\u00a0 The elevators can be queried to find out their position, direction of travel, load,\u00a0 etc. For example, given an array of elevator objects,\u00a0<em>e<\/em><\/p><pre>\/\/the current position (m above reference) of elevator 2 is e[2].m_CurrentPosition;<\/pre><pre>\/\/the direction (where -1 down, 0 none, 1 up) of elevator 2 is e[2].m_Direction;<\/pre><pre>\/\/this allocates an up landing call to elevator 2 for floor 5 e[2].m_UpLandingCalls[5]=1;<\/pre><p>Once calls have been allocated to an elevator, the elevator will answer the landing calls in the right order, and accept car calls from the passengers.\u00a0 These and all the other features of Elevate are available to the new control system without additional programming.<\/p><p>The result of this approach is that new control systems can be implemented in Elevate in as little as 300 lines of software code.<\/p><p>Elevate has been used to develop and test a range of control systems.\u00a0 Its application in the research and development of energy saving, green elevator control systems is discussed in [3].<\/p><h4><br \/>7.2\u00a0\u00a0 Traffic Analysis<\/h4><p>Elevate can be used to analyse the elevator performance of all building types including offices, hotels, hospitals, shopping centers, flats, warehouses, etc.\u00a0 Unlike conventional \u201cup peak\u201d round trip time calculations, you are not restricted to passengers loading at the ground floor; all types of passenger and goods loads can travel between all floors.<\/p><p>An example print out of data\/results in Appendix 1 shows how Elevate can be used to model the performance of a elevator system in a shopping center.\u00a0 Note that in a shopping center:<\/p><ul><li>people will be arriving at all floors<\/li><li>some passengers will be alone, others may be with children in buggies.\u00a0 By entering passenger traffic in \u201cperiods\u201d Elevate allows you to have different types of passengers using the elevators at the same time.\u00a0 In this example, an adult with a child in a buggy can be set to take more room in the elevator, and to take longer to get into and out of the elevator.<\/li><\/ul><h3><br \/>8.\u00a0\u00a0 Conclusions<\/h3><p>Elevate has been designed as a development platform for elevator control systems and as an advanced traffic analysis tool.<\/p><p>Elevate is written in Microsoft Visual C++.\u00a0 It uses object oriented techniques, breaking down the programming tasks into classes.\u00a0 These classes represent objects (e.g. elevator, person, building) which are straight forward to conceptualise, and therefore easier to work with.<\/p><p>The interface is Windows based.\u00a0 The user enters data about the system into dialog boxes titled: Building data, Elevator data, Passenger data, Simulation data and Job data.<\/p><p>The program performs a time slice simulation, providing a graphical representation of the elevators as they serve the passenger calls.\u00a0 Once the simulation is complete, Elevate displays results on screen in a print preview format.\u00a0 These results include details of input data, waiting times and transit times.<\/p><p><strong><br \/>REFERENCES<br \/><\/strong><\/p><ol><li>Perry G, Ross J\u00a0 Visual C++ By Example (Indianapolis: Que Publishing) (1994)<\/li><li>Barney G C, dos Santos S M\u00a0 Elevator Traffic Analysis Design and Control\u00a0 (London: Peter Peregrinus) 2nd edition (1985)<\/li><li>Peters R D, Mehta P Green Lift Control Strategies\u00a0 The International Journal of Elevator Engineers, Volume 2 (1998)<\/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>Simulation for Control System Design and Traffic Analysis Dr Richard Peters, Peters Research Ltd This paper was presented at ELEVCON\u00a0ZURICH\u00a01998, The International Congress on Vertical Transportation Technologies\u00a0and first published in the IAEE book &#8220;Elevator Technology 9&#8221;, edited by G. C. Barney.\u00a0 It is reproduced with permission from The International Assocication of Elevator Engineers.\u00a0 The paper [&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-1086","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>Simulation for Control System Design and Traffic Analysis - 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=\"Simulation for Control System Design and Traffic Analysis - Peters Research\" \/>\n<meta property=\"og:description\" content=\"Simulation for Control System Design and Traffic Analysis Dr Richard Peters, Peters Research Ltd This paper was presented at ELEVCON\u00a0ZURICH\u00a01998, The International Congress on Vertical Transportation Technologies\u00a0and first published in the IAEE book &#8220;Elevator Technology 9&#8221;, edited by G. 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