The study in the paper is aimed to develop a yaw stability controller (YSC) by way of actively dynamic distribution of the longitudinal tire forces, which is considered to be one of the promising means of chassis cont...
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This paper presents the concepts, configuration and special models for the RF-injection method applied to a radar-based missile hardware-in-the-loop simulation. The missile RF-injection method inserts sum and differen...
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ISBN:
(纸本)1565553012
This paper presents the concepts, configuration and special models for the RF-injection method applied to a radar-based missile hardware-in-the-loop simulation. The missile RF-injection method inserts sum and difference channel signals into the radar-based missile- under-test downstream from where these signals are normally created by the missile's antenna electronics. The missile RF-injection method reduces costs by eliminating the need for an anechoic chamber, moveable target generator, flight table and their maintenance. Some fidelity is expected to be lost but multiple-target simulation capabilities are increased. The methodology is not new and has been used for testing radar units, but its use for a missile hardware-in-the- loopsimulation is new. Video-injection techniques for missiles using IR or visible light to track targets are not described.
The Stinger missile system has been in the field for almost 30 years. As the system has matured and gone through several upgrades, the target modeling requirements in the hardware-in-the-loop (HWIL) simulation have be...
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ISBN:
(纸本)9781622763511
The Stinger missile system has been in the field for almost 30 years. As the system has matured and gone through several upgrades, the target modeling requirements in the hardware-in-the-loop (HWIL) simulation have become more stringent. One of the more difficult tasks is the registration of simulation irradiance models to the models used in the lethality program. This paper will describe the process by which the BRL-CAD™ models used in the lethality program are converted to models that are compatible with the HWIL simulation. The process by which the simulation models are validated to test data will also be discussed.
A series of river trials are carried out to verify the feasibility of the velocity matching method and the velocity plus attitude matching method. First of all, a hardware-in-the-loop simulation system is designed in ...
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ISBN:
(纸本)9781424426928
A series of river trials are carried out to verify the feasibility of the velocity matching method and the velocity plus attitude matching method. First of all, a hardware-in-the-loop simulation system is designed in this paper. Secondly, the kalman filter models for velocity matching and velocity plus attitude matching are introduced. Four types of river trials are done, respectively, velocity matching under the mooring condition, velocity matching under the uniform direct motion condition, velocity plus attitude matching under the uniform direct motion condition, velocity matching and velocity plus attitude matching under the 360-deg turn condition. Finally, the results of river trials are given. These results show that velocity matching and velocity plus attitude matching are practicable. Both of them are
This paper presents a real time digital simulator based test system as a new method for testing microgrid management system (MMS). This system is composed of a real time digital simulator and a developed communication...
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ISBN:
(纸本)9781424452293
This paper presents a real time digital simulator based test system as a new method for testing microgrid management system (MMS). This system is composed of a real time digital simulator and a developed communication emulator. Real time digital simulator runs a simulation case for microgrid model and distributed generation source model. Communication module emulates communication functions of micro-sources in microgrid by transmitting the simulated signals to MMS. The MMS controls operation of micro-sources to control the power flow at the point of common coupling (PCC) and the voltage and frequency of microgrid. A prototype MMS was tested for stand-alone and grid-connected operation to verify the validation of the developed HILS system.
This paper extends an XML based system of systems simulation framework using DEVS to support hardware-in-the-loop simulations for SoS. A system of systems approach enables the simulation and analysis of multiple compl...
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ISBN:
(纸本)9781424427932
This paper extends an XML based system of systems simulation framework using DEVS to support hardware-in-the-loop simulations for SoS. A system of systems approach enables the simulation and analysis of multiple complex, independent, and cooperative systems by concentrating on the data transferred among systems. This paper wraps information exchanged among heterogeneous systems in XML to enable receiving systems to correctly parse and interpret the information. A Groundscout robot is deployed as a real agent working cooperatively with virtual agents in a robotic swarm. The DEVS activity concept facilitates conununication between the real system and virtual systems in the SoS. A robust threat detection example is provided. Initial performance metrics of the SoS are briefly discussed.
The UAVs are controlled by the control system that is including the sophisticated software to stabilize and move the plants. In the development of the UAVs, financial waste and time cost is grown because even a failur...
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This paper presents a comprehensive comparison of several real-time motion controller topologies implemented on a field programmable gate array (FPGA). Controller topologies are selected as proportional-integral-deriv...
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ISBN:
(纸本)9781424451777
This paper presents a comprehensive comparison of several real-time motion controller topologies implemented on a field programmable gate array (FPGA). Controller topologies are selected as proportional-integral-derivative controller with command feedforward, sliding mode controller, fuzzy controller, and a hysteresis controller. Controllers and other necessary modules are developed using Verilog HDL and they are implemented on a ML505 development board with a Xilinx Virtex-5 FPGA chip. In order to take full advantage of FPGA and to provide a more accurate comparison, an (soft-core) embedded processor is not employed in the design. The developed modules, which include PWM generator, quadrature encoder decoder, velocity estimator, reference profile generator etc, are fully tailored for the application. To perform the necessary calculations for certain controller topologies, an open-core floating point unit (FPU) is also adopted to the design. The performances of the aforementioned controllers are rigorously evaluated via a hardware-in-the-loop simulation of a field-oriented induction motor system.
Real-time hardware-in-the-loop simulations demonstrate the utility of a hybrid approach to total system modeling. Part of a system is modeled and simulated with computational hardware, which interacts in real-time wit...
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ISBN:
(纸本)9781424442515
Real-time hardware-in-the-loop simulations demonstrate the utility of a hybrid approach to total system modeling. Part of a system is modeled and simulated with computational hardware, which interacts in real-time with physical equipment operating in the real world. In order to achieve a realistic system environment for a physical device, both the dynamics and the power required must be included in the simulation. In this power-hardware-in-the-loop (PHIL) study, a Variable Voltage Source (VVS), under the control of a real-time power systems simulator, is used to emulate the dynamics of a ship-board electrical bus. This bi-directional, controllable bus supplies power to a commercial 2.5 MW variable speed drive (VSD) and induction motor (IM). To complete the environment, realistic ship propeller loads are provided by a 2.5 MW dynamometer which is also under the control of the real-time simulator. The simulation includes multiple features of an all-electric ship, including multiple generator dynamics, propulsion motor power regeneration, and pulse loads.
In view of introduction of the composition and working principle of the electro-hydraulic position servo control system, the mathematical model of the system was built. In order to acquire more accuracy system mathema...
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ISBN:
(纸本)9780769537528
In view of introduction of the composition and working principle of the electro-hydraulic position servo control system, the mathematical model of the system was built. In order to acquire more accuracy system mathematical model, System model identification and verification of electro-hydraulic position servo system were carried out based on hardware-in-the-loop simulation environment of Real-time Workshop (RTW) and system identification toolbox in MATLAB. A hybrid controller composed of a proportional controller, a fuzzy controller and a classical PID controller, for which the parameters of the PID controller can be adjusted online by using the fuzzy control rule, The zero position of fuzzy domain was regarded as the switching threshold, and stable switching is implemented between the proportional control and the proportion-fuzzy PID control. The simulation results show that the steady-state error of system is eliminated, the rapidity is enhanced by the hybrid control strategy, Moreover, and its ability of adapting to system parameter variation is superior to the other controllers.
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