Most existing studies on connected and automated vehicle (CAV) applications apply simulation to evaluate system effectiveness. Model accuracy, limited data for calibration, and simulation assumptions limit the validit...
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ISBN:
(纸本)9781728103235
Most existing studies on connected and automated vehicle (CAV) applications apply simulation to evaluate system effectiveness. Model accuracy, limited data for calibration, and simulation assumptions limit the validity of evaluation results. One alternative approach is to use emerging hardware-in-the-loop (HIL) testing methods that allow physical test vehicles to interact with virtual vehicles from traffic simulation models. This provides an evaluation environment that can replicate deployment conditions at early stages of CAV implementation-without incurring excessive costs related to large field tests. In this study, a hardware-in-the-loop (HIL) testing system for CAV applications is proposed. Cooperative adaptive cruise control (CACC) is one of the key CAV applications that has received a lot of attention. This study develops a HIL proof-of-concept testing prototype for CAV applications in a vehicle-to-vehicle (V2V) environment. The contributions of this study include developing a HIL testing architecture for V2V-based CAV applications;implementing the proposed HIL architecture;developing a prototype;and testing CACC as the selected use case to observe HIL system performance. The results of this effort also contribute to a better understanding of CACC string performance.
Firstly, this paper analyzed in theory two kinds of frequency regulation control strategies, swing equation control strategy and additional frequency regulation characteristics control strategy, which were adopted by ...
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ISBN:
(纸本)9781538667750
Firstly, this paper analyzed in theory two kinds of frequency regulation control strategies, swing equation control strategy and additional frequency regulation characteristics control strategy, which were adopted by the demonstration project. The differences between two strategies in frequency modulation start-up time, oscillation risk, mode of supporting power, inertia response dead zone and so on were compared and studied. Then, relying on the recorded field data, paper showed the actual frequency modulation effect and characteristics of differences between the two strategies. Lastly, we optimized the VSG control strategies and proposed two new ones to make full ues of the available power of PV-VSG and coordination of photovoltaic and energy storage effectively to stable the grid frequency. The effectiveness of new control strategies was verified on a RT-LAB semi-physical simulation platform. This work is supported by science and technology project of the headquarter of State Grid Corporation of China.
The hardware-in-the-loop simulation technique is a promising technique which is widely used in many fields such as aviation and Automotive Systems. This kind of technique comprises software and reconfigurable hardware...
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An electro-hydraulic actuation system with critically lapped servovalve and pressurized return line is exposited. The dynamic equations governing the behavior of various components are explained;using these nonlinear ...
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An electro-hydraulic actuation system with critically lapped servovalve and pressurized return line is exposited. The dynamic equations governing the behavior of various components are explained;using these nonlinear equations, a simulation model is developed in Simulink software for the purpose of controller design and verification. Model requires very small integration step size as the equations involved are stiff. A relationship between the various pressures in the system is derived, and a simplified method for the nonlinear modeling of electro hydraulic actuating system is developed using these relationships. The simplified model is computationally efficient as the integration step-size is large compared to the original model. The computationally efficient model finds application in real-time hardware-in-loopsimulation (HILS). (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
In this article, through the introduction and analysis of the shell and tube heat exchanger, given the calculation formula, transfer resistance and equation about dynamic characteristics of the exchanger. A self-learn...
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ISBN:
(纸本)9789881563958
In this article, through the introduction and analysis of the shell and tube heat exchanger, given the calculation formula, transfer resistance and equation about dynamic characteristics of the exchanger. A self-learning fuzzy algorithm is designed to optimize main temperature controller PID parameters online, did the Matlab simulation and hardware-in-the-loop simulation experiment in the platform of SMPT1000. Achieved on-line temperature control and efficiency monitor of the heat exchanger. Experiments show that the self-learning fuzzy optimization of the heat exchanger temperature control and efficiency monitor, have high temperature control precision, short adjustment time, strong disturbance resistance and high heat transfer efficiency. o(3) It solves the problem that the temperature of the heat exchanger is not well controlled and the efficiency is difficult to be effectively monitored.
The simulation turntable is an important device for the hardware-in-the-loop simulation of satellites or other spacecraft. It can simulate the movement attitude of the spacecraft in space such as roll, pitch, and yaw,...
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ISBN:
(纸本)9781538645093
The simulation turntable is an important device for the hardware-in-the-loop simulation of satellites or other spacecraft. It can simulate the movement attitude of the spacecraft in space such as roll, pitch, and yaw, and is widely applied in electromagnetic countermeasure, space shooting and other fields. This paper takes the on-orbit service spacecraft as the research object, studies the coordinate system transformation and implementation problems of ground simulation of spacecraft attitude based on the five-axis turntable, designs the coordinate system conversion process and verifies the effectiveness of the conversion process. The coordinate system conversion method studied in this paper can effectively realize the ground simulation of spacecraft attitude on the five-axis turntable, providing theoretical guidance and effective methods for solving the problems of attitude simulation in on-orbit service tasks, having more important guiding values for simulating experiments in the field of aerospace engineering such as rendezvous and docking.
The energy transition requires simulators that aid the research on and validation of energy management systems. Hereby, these systems not solely focus on electricity, but involve the optimization of multiple energy ca...
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The energy transition requires simulators that aid the research on and validation of energy management systems. Hereby, these systems not solely focus on electricity, but involve the optimization of multiple energy carriers in a multi-energy system. This paper presents DEMKit, an open-source toolkit with device, grid and control components for such a multi-energy management solution. The modular design allows DEMKit to test different optimization algorithms on the same scenario. Device components can be replaced by adapters to control real hardware in a deployment or hardware-in-the-loop simulation. Results of a demonstration setup of DEMKit in a smart home show the potential of using DEMKit to bridge the gap between scientific research and test new solutions in practice.
On the basis of the market demand, our company proposed to upgrade the power steering system of some cars, from hydraulic power steering to electric power steering (EPS). First of all, the system match of key parts wa...
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Converter losses play a crucial role in the process of power converter design. Especially semiconductor components and heat sink selection are strongly dependent on the total power converter losses and thus affect the...
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Converter losses play a crucial role in the process of power converter design. Especially semiconductor components and heat sink selection are strongly dependent on the total power converter losses and thus affect the power converter size and its price. The most popular techniques for determination of the losses are based on the computer simulation of the power converter. These kinds of simulations could be very time consuming, because on one side, the simulation needs very short step-time for differential equations calculation to model power converter switching. On the other side, the temperature dynamics of heat sink are commonly slow and depend on power cycles of converter. With the help of FPGA-based hardware in the loop (HIL), the simulation could run real-time and it is possible to test different scenarios, different modulation techniques and see their influences on converter losses. This approach can lead to reduction of losses to the state, when it is possible to reduce the size of converter. Furthermore, the HIL simulation could be used for testing and developing control algorithm in real time conditions. It also offers flexibility in the easy change of model parameters and monitoring values which are not or hardly obtainable in real machine. This paper presents the FPGA-based HIL simulator of induction motor drive with three phase voltage source inverter based on Semikron IGBT modules.
This paper analyzes the potential benefits in terms of fuel consumption and NOX emissions of an optimized speed trajectory in a real driving situation. The speed management of the vehicle is approached as an optimal c...
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This paper analyzes the potential benefits in terms of fuel consumption and NOX emissions of an optimized speed trajectory in a real driving situation. The speed management of the vehicle is approached as an optimal control problem, based on a simplified vehicle model supported by experimental measurements. This optimal control problem is addressed twice on a daily commuting route: one for minimum fuel consumption and another for minimum NOX emissions. These speed trajectories are followed in a vehicle test bench, simulating the actual road conditions, with a fully instrumented vehicle. The experimental results are compared to the way two different drivers perform the same route in the same amount of time with their own natural driving styles. Optimal results demonstrate that optimal speed trajectory is strongly dependent on the minimization objective (either fuel or NOX), and that reductions around 4% in fuel consumption and 35% in NOX emissions were possible in the testing route compared to intuitive human driving styles. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
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