Three controllers, namely the skyhook controller, the mixed-single-sensor controller and the groundhook controller, are compared using two validation approaches, namely the hardware-in-the-loop approach and the softwa...
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Three controllers, namely the skyhook controller, the mixed-single-sensor controller and the groundhook controller, are compared using two validation approaches, namely the hardware-in-the-loop approach and the software-in-the-loop approach. The software-in-the-loop approach considers the dynamics (e.g. the body heave, the yaw, the roll, the pitch and the force) and the geometric parameters (the motion ratio of the suspension) without the real-time constraints. This allows an easier debugging and design procedure to be carried out for the controlsystems. The hardware-in-the-loop approach includes a commercial magnetorheological damper for testing the dynamic and transient responses in a controlsystem. It is of interest to compare the conclusions generated under both approaches. The hardware-in-the-loop approach considers an on-off magnetorheological damper, and a quarter-vehicle model in a real-time embedded system. Two types of test were applied: chirp surface road tests and type F surface tests (ISO 8606:1995). For the software-in-the-loop approach the non-linearities and dynamics due to the geometric and physical component characteristics of a vehicle model were simulated by CarSim (R) software, while the non-linear magnetorheological damper model and the controller were running in MATLAB (R)/Simulink (R). The classical tests for the vehicle, namely the dynamics bounce sine sweep test, the double-lane-change test and the fishhook test, were applied. In the hardware-in-the-loop approach, the best controller was the skyhook controller for comfort and the groundhook controller for road holding. In the software-in-the-loop approach, the mixed-single-sensor controller is the best for comfort, and the groundhook controller can be used in emergency driving conditions since it improves the stability, the road holding and the wheel tramp. The best controller in the hardware-in-the-loop approach and the best controller in the software-in-the-loop approach are not the sam
The philosophy. aims and recent results obtained in an investigation of improvements in the human-computer interface for computer-aided analysis. simulation and implementation of controlsystems are described in this ...
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The philosophy. aims and recent results obtained in an investigation of improvements in the human-computer interface for computer-aided analysis. simulation and implementation of controlsystems are described in this paper. It is shown that descriptions of controlsystems in the form of block diagrams and signal flow graphs with standard mathematical text improves the interface by making it more natural. familiar and friendly for the user. The support of this natural interface. through a menu-driven. high-resolution colour graphics workstation environment with both local and networked computing resources is described. design criteria are develLlped for the data structures. data transformations and consistency-checking algorithms that are necessary to support the user and allow the system to be used in a flexible fashion. Rule-driven symbolic manipulation for system transformation. with computer algebra systems for mathematical processing at all stages of the design process, are shown to be powerful new concepts for application in this stage of computer-aided control system design and simulation.
In this paper we will describe and illustrate some applications of CACSD packages in Dutch industry. Some typical usages of CACSD in industry will be illustrated. Further we will analyse the results of an inquiry with...
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In this paper we will describe and illustrate some applications of CACSD packages in Dutch industry. Some typical usages of CACSD in industry will be illustrated. Further we will analyse the results of an inquiry with respect to the use and need for CACSD in industry and universities which was held in 1982/1983 in the Benelux and we will resume the activities of a working group in the Benelux which aims to promote CACSD
This paper describes a new computer simulation package for nonlinear dynamic systems that can be described by a block diagram and/or state space equations. Graphics routines are used to draw the block diagram for the ...
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This paper describes a new computer simulation package for nonlinear dynamic systems that can be described by a block diagram and/or state space equations. Graphics routines are used to draw the block diagram for the system. Elements for the diagram are selected from a menu that includes transfer functions, summers, state space equations, and several nonlinearities such as dead zone, limiters, hysteresis, etc. Once the diagram is complete, the user activates the analysis package which can be used to generate transfer functions, root locus plots, Bode plots, and/or transient response plots. A unique feature of this simulation package is the automatic formulation of the state-space equations from the graphics image of the system.
The focus of this paper is to investigate stabilizing control (single-loop PID control) of a dividing wall column (DWC) for separating ethanol, n-propanol and n-butanol at atmospheric pressure. Three control structure...
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The focus of this paper is to investigate stabilizing control (single-loop PID control) of a dividing wall column (DWC) for separating ethanol, n-propanol and n-butanol at atmospheric pressure. Three control structures arc studied: control structure with fixed split ratios (CS1), control structure with an active liquid split (CS2) and control structure with an active vapor split ratio (CS3). The dynamic performances of the three proposed control structures prove that the three control structures are able to handle feed disturbances inserted into DWC. The simple control structure with fixed split ratios (CS1) is more applicable in industry. Considering the vapor split ratio disturbance, CS2 and CS3 are better than CS1. If the feed composition of A rarely changes, CS3 is able to handle the other feed disturbances. This paper proves that the three-product DWC can be controlled with only three temperature controllers. (C) 2016;IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.
This paper addresses dispatch of a microgrid system using nonlinear economic model predictive control. Constraints in the model predictive control formulation are used to ensure that microgrid units stay within their ...
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This paper addresses dispatch of a microgrid system using nonlinear economic model predictive control. Constraints in the model predictive control formulation are used to ensure that microgrid units stay within their desired operational range (i.e. power output, storage level, and temperature) and that the net energy exchange with the macrogrid over each hour stays within some scheduled bounds. A dynamic, continuous-time microgrid model is developed and used to test this dispatch strategy over a 24-hour period. The proposed dispatch strategy is able to satisfy the bounds on energy exchange and desired temperature.
This paper examines microgrid unit dispatch, with hourly bounds on energy exchange with the macrogrid and minimum storage level constraints. These goals can be used to meet market constraints and to ensure there is su...
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This paper examines microgrid unit dispatch, with hourly bounds on energy exchange with the macrogrid and minimum storage level constraints. These goals can be used to meet market constraints and to ensure there is sufficient energy reserved for future periods, respectively. In particular, economic model predictive control is used to minimize cost while ensuring these scheduling goals and other operational constraints are satisfied. Simulation of a dynamic microgrid system over a 24-hour period shows that the proposed dispatch strategy is able to effectively reject forecasting errors and meet the established energy exchange and storage level goals. (C) 2016, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.
The paper deals with the case studies concerning the problems of dynamic optimization. It introduces the following examples: problem with free time and fixed end point, problem with fixed time and free end point, and ...
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ISBN:
(纸本)9783902823144
The paper deals with the case studies concerning the problems of dynamic optimization. It introduces the following examples: problem with free time and fixed end point, problem with fixed time and free end point, and problem with fixed time and fixed end point. It shows the construction of the models in Matlab&Simulink and Dynopt toolbox, and their solution and verification of the results.
This paper describes the design and implementation of an external DSF-based controller for a laboratory robot. This external controller has an open architecture and is easily programmable, so that it can be used far i...
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ISBN:
(纸本)085296708X
This paper describes the design and implementation of an external DSF-based controller for a laboratory robot. This external controller has an open architecture and is easily programmable, so that it can be used far implementing a wide variety of central schemes on a single device. A simple independent-joint PID control is implemented and experimentally tested, and the results are compared with those obtained with the robot's internal built-in controller, which uses a similar central strategy. To further illustrate the flexibility of the presented external controller a simple sliding-made central scheme is also implemented and tested.
A computer-aided control system design tool is presented. This tool is able to take advantage of a database of Pareto optimal PID controllers. The idea is to give to the control engineer an useful tool to close the ga...
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