Real-time simulation is proving very useful in simulating complex and expensive systems using the high performance multi-processors. It has many applications in the area of testing of controllers and protection system...
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ISBN:
(纸本)9781457711091
Real-time simulation is proving very useful in simulating complex and expensive systems using the high performance multi-processors. It has many applications in the area of testing of controllers and protection systems under real-field like situations. In this project, an effort has been made to prepare a low-cost system to carry out real-time simulation in an educational laboratory setting. The system is useful in explaining and demonstration of the dynamics and control of complex real-life systems that cannot be set up in an academic institute in any practical way. Examples of such systems include complex electric power systems, wind mills, automobiles and locomotives. The simulation system implements the system model, and its control system, in real-time. The generalized software for real-time simulation has been developed in assembly language. The testing and validation of the software and hardware tools has been accomplished.
The inherent non-idealities, especially the time delay, in the interface of a PHIL simulation may lead to large simulation errors or even instabilities. Therefore, it is extremely important to have an effective way to...
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ISBN:
(纸本)9781622763580
The inherent non-idealities, especially the time delay, in the interface of a PHIL simulation may lead to large simulation errors or even instabilities. Therefore, it is extremely important to have an effective way to evaluate the simulation accuracy in order to justify the reliability of a PHIL experiment. A generalized metric defining the error functions from two types of PHIL interface perturbations is proposed in this paper. Two simulation examples are performed to show the validity of the proposed method.
The demand for highly accurate attitude determination sensors has increased in the last few decades. One of the best and more accurate attitude determination sensors for spacecraft is the star tracker, which determine...
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ISBN:
(纸本)9780877035695
The demand for highly accurate attitude determination sensors has increased in the last few decades. One of the best and more accurate attitude determination sensors for spacecraft is the star tracker, which determines 3-axis attitude with an accuracy of a few arc-secs. In order to achieve this high accuracy, the star tracker hardware and software can be tested on-ground with an accurate optical simulator. This work presents an open-loop and closed-loophardware test bench to demonstrate a star tracker's functionality. The test bench consists of an optical star field simulator, a real-time simulation computer and the star tracker to be tested. A dSPACE real-time simulator is used to simulate vehicle attitude and the associated sky image is provided as input to the star tracker camera using the optical simulator. To close the simulationloop, the dSPACE simulator can respond to the star tracker measurements by changing the vehicle dynamics and thus the simulated star field image. The hardware-in-the-loop test bench was used to test the star tracker for the Hybrid Navigation Experiment for the SHEFEX-2 sounding rocket mission, which will be launched in late 2011. The test bench was first calibrated and aligned to remove errors in the simulation. End-to-end results using both the open- and the closed-loop test benches are then analyzed and discussed, which include measuring the total turn-around time and maximum vehicle rotation rate for the star tracker.
This paper aims at designing a modeling approach for multidisciplinary integration complex product. A new ideology is introduced, that each subject is taken like a subsystem, using a nested structure as its autonomous...
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ISBN:
(纸本)9781424487554
This paper aims at designing a modeling approach for multidisciplinary integration complex product. A new ideology is introduced, that each subject is taken like a subsystem, using a nested structure as its autonomous model, and each autonomy model paralleling its counterparts. The dynamic autonomy model can be expressed in a universal format, with the Parameters Pool (PP) and the Coupling Estimate (CE) two items, reflecting parameters' alteration and the total impact of other interaction's subjects, respectively. The model of PP and CE nested in the autonomy model. All state variables are shared through the data exchange interface between each subsystems, and the coupling of interdisciplinary is implemented by PP and CE. Each subject has an enable coefficient for its working state, which can implicate single subject real-time plugging and pulling, such as systems change during hardware-in-the-loop-simulation and random noise. Also, this modeling approach can be easily used for multi-disciplinary, distributed integration platform. Two examples are provided to check its accuracy and illustrate its application.
This paper proposes an algorithm development and test procedure for power electronics and power system research using simulation, hardware in the loop (HIL) simulation, and electrical experiments. A flexible and recon...
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ISBN:
(纸本)9781622763580
This paper proposes an algorithm development and test procedure for power electronics and power system research using simulation, hardware in the loop (HIL) simulation, and electrical experiments. A flexible and reconfigurable experimental setup is introduced in this paper first and the related problems of power electronics and power system research are identified. The importance of the simulation, especially the real time HIL simulation is emphasized, and a complete design procedure is proposed and analyzed in detail. Using the proposed procedure, the research and test cycle can be greatly reduced. The algorithm development can also be standardized according to design requirements. A converter control case study demonstrates the entire design procedure and verifies the effectiveness of the proposed design procedure.
In order to verify the performance of the designed temperature controller of the plastic extruder using supercritical CO2, we developed a hardware-In-the-loop (HIL) simulation system. The specified HIL simulation syst...
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ISBN:
(纸本)9781457703218
In order to verify the performance of the designed temperature controller of the plastic extruder using supercritical CO2, we developed a hardware-In-the-loop (HIL) simulation system. The specified HIL simulation system was founded upon the NI products, while the temperature controller and its accessorial parts were constructed in Matlab/Simulink environment. Labview and Simulink were combined together with NI simulation Interface Toolkit (SIT), and a friendly Human Machine Interface (HMI) was developed and implemented in the host computer by using TCP/IP protocol for data communication. The result showed that the designed temperature control algorithm had better effect when used in the plastic extruder production field. This HIL simulation system can shorten the development cycle and cost, improve the design level of the control system, and provide a solution to the demonstration of the controller in the real-time mode. Meanwhile, the HMI solved the problem of real-time monitoring in the process of the HIL simulation. What's more, this simulation system can be applied in other process control fields as flow, pressure, etc.
In order to improve hybrid electric vehicle's energy efficiency, this paper did a research on the regenerative braking system of HEV. In this paper we proposed a new parallel regenerative braking control strategy ...
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ISBN:
(纸本)9783037850817
In order to improve hybrid electric vehicle's energy efficiency, this paper did a research on the regenerative braking system of HEV. In this paper we proposed a new parallel regenerative braking control strategy for HEV and analyzed its characteristics in details. Based on theoretical analysis, we developed a parallel regenerative braking controller for a certain HEV, and built hardware-in-the-loop simulation system to test the controller's performance. We chose the UDDS driving condition for simulation, and the result shows that the regenerative braking controller we developed is effective and reliable. The controller fulfills the parallel regenerative braking control strategy and distributes the braking force accurately. The energy recovery efficiency reaches 16.7%, which significantly improves the vehicle's energy efficiency.
The main function of a suspension system is to reduce/isolate vibration caused by road irregularities to improve comfort, reliability and road holding of the vehicle. In this paper, various control aspects in controll...
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The Hybrid Navigation System is being developed to achieve the required attitude accuracy and calculate a navigation solution for the SHEFEX2 mission, which will be launched in February 2012 from Andøya Rocket Ra...
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ISBN:
(纸本)9781624101540
The Hybrid Navigation System is being developed to achieve the required attitude accuracy and calculate a navigation solution for the SHEFEX2 mission, which will be launched in February 2012 from Andøya Rocket Range in Norway by the German Aerospace Center (Deutsches-Zentrum fur Luft- und Raumfahrt, DLR). This system fuses data from an IMU, GPS receiver, and star tracker using the extended Kalman filter. For testing it needs a realistic software- and hardware-in-the-loop test bench that can simulate the expected flight conditions and test the system. The hardware test bench requirements include: real-time simulation progression, accurate synchronization of all components, and providing stimulation inputs for the GPS receiver, star tracker and gyro instruments (inside the IMU) representative of the expected flight profile. Another key requirement is that the test bench must be easily reconfigurable by swapping real and modeled instruments. This allows the system to be tested with variable levels of complexity, which decreases debugging time by allowing the user to separate or remove the problem points by simply swapping cables. The developed software-in-the-loopsimulation consists of the navigation flight code wrapped in a Simulink s-function and fed by several high-fidelity Matlab/Simulink models which simulate the rocket dynamics and system sensors. The hardware-in-the-loop test bench runs the models from the software simulation on a dSPACE real-time simulator, which feeds the modeled sensor outputs to the hybrid navigation system's navigation computer. With the help of a Spirent GSS7700 GPS signal generator, a Jenoptik Optical Sky field Simulator, and an Acutronic 3-axis rotation table all synchronized to the dSPACE simulation, the modeled sensors can be replaced with real sensors fed with stimulated input. Navigation results from the hardware test bench are compared with results from the software-in-the-loopsimulation to ensure that the hardware-in-the-loop sim
To reduce the development cycle time and cost of the transmission control unit (TCU) for automated manual transmission (AMT), a rapid testing platform (RTP) based on the concept of hardware-in-the-loop simulation is i...
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