A direct self-repairing controller based on adaptive sliding mode control technique designed for the quadrotor helicopter with actuator faults is studied in this *** any fault diagnosis,such adaptive sliding mode-base...
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ISBN:
(纸本)9781479946983
A direct self-repairing controller based on adaptive sliding mode control technique designed for the quadrotor helicopter with actuator faults is studied in this *** any fault diagnosis,such adaptive sliding mode-based fault-tolerant control is implemented to track the desired output signal,when any actuator of the quadrotor loses ***,the Lyapunov stability theory applied can guarantee the stability of the whole system and the convergence of the tracking ***,the availability of the proposed method is verified by the numerical simulation and HIL (hardware-in-loop) simulation on Qball-X4 to ensure the tracking performance of this nonlinear system under both normal and faulty conditions.
Inner-Formation Gravity Measurement Satellite System (IFGMSS) is an original and innovative scheme for Earth gravity measurement. To achieve high precision Earth gravity mapping, outer satellite in IFGMSS should track...
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ISBN:
(纸本)9781479903337
Inner-Formation Gravity Measurement Satellite System (IFGMSS) is an original and innovative scheme for Earth gravity measurement. To achieve high precision Earth gravity mapping, outer satellite in IFGMSS should track the motion of inner satellite tightly and avoid the possible collision between them. To restrain the atmospheric drag effects and achieve the high precision relative position keeping, this paper presents an effective control method and a hardware-in-loop simulation system for IFGMSS. In the control algorithm, the compensation term of atmospheric drag with an exponent atmosphere density model is added. Considering the dynamic effects and uncertainty of real atmospheric drag, a PD-like control term is also introduced in the control algorithm. Since IFGMSS adopts micro-thrusters sets as the actuators, a modulation method is used to map the discrete impulse thrust into equivalent continuous thrust. In the hardware-in-loop simulation system, high-orders' Earth gravity model and high precision atmospheric drag model are included, which can testify the controller effectively. A set of simulations are performed, and the results demonstrate that the controller are valid. It shows that the devised controller can effectively compensate each kind of disturbances and achieve mm-order's high precision relative position keeping.
It has been shown that high seasonal energy efficiency ratio (SEER) air conditioner compressor motors will stall during a voltage sag of 30% or greater such as during a sub-transmission fault. When these motors stall,...
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ISBN:
(纸本)9781479936571
It has been shown that high seasonal energy efficiency ratio (SEER) air conditioner compressor motors will stall during a voltage sag of 30% or greater such as during a sub-transmission fault. When these motors stall, they draw two to three times their rated current and reactive power. The motor stall affects the entire power system beyond the duration of voltage drop of the fault resulting in a system-wide impact. This phenomenon is known as fault induced delayed voltage recovery (FIDVR) or slow voltage recovery (SVR). The FIDVR or SVR event is not only influenced by the air conditioner motor penetration but also by the voltage sensitivity of the load composition in the distribution system. In this study, the single-phase induction machine model that is available in the real time digital simulator (RTDS) is used to simulate the stall nature of these high SEER machines. This paper also addresses the effect of distribution system loads on FIDVR and analyzes the effect using RTDS. A group of the machine models are installed in a test power system along with constant impedance (Z), constant current (I), and constant power (P) load models to study the effect of these loads on the stall nature of the single phase induction machines.
In the hydrostatic thrust bearing with open-loop quantity oil supply system for the heavy NC machine tool, the time-variable oil viscosity and the loads will cause the lubricant film thickness deviating from the optim...
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ISBN:
(纸本)9781424425020
In the hydrostatic thrust bearing with open-loop quantity oil supply system for the heavy NC machine tool, the time-variable oil viscosity and the loads will cause the lubricant film thickness deviating from the optimum value, which reduce the bearing film rigidity and affect the machine tool precision. This paper proposed a controllable hydrostatic thrust bearing, which combined the constant flow chambers and the controllable flow chambers. The chamber flow can be adjusted automatically according to the load, the cutting force, and the thermal results of thrust bearing. The controllable chamber flow was adjusted by the electro-hydraulic servo variable mechanism. The oil film thickness error was measured in real time to maintain the most optimum film thickness. The models of controllable chamber flow and servo variable mechanism were established, and the model identification experiments for servo variable mechanism were carried on. The hardware-in-loop simulation results show that the controllable bearings assure the stability and rapidity of system, compensate effectively the effect of load parameter on oil film thickness, and improve the position tracking performance, and validate the creditability of the identification model.
Load simulator (LS) is a key equipment for rudder system in hardware-in-loop simulation experiment. In this paper, the present main research results of LS are reviewed. These methods are divided into four kinds based ...
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ISBN:
(纸本)9781467303118
Load simulator (LS) is a key equipment for rudder system in hardware-in-loop simulation experiment. In this paper, the present main research results of LS are reviewed. These methods are divided into four kinds based on their mechanism in suppressing "surplus torque/force" and their characteristics are analyzed. The mathematical model of electro-hydraulic load simulator is carried out and the source of "surplus torque" is discussed. A new strategy called "Dual-loop Control" is proposed to meet some new challenges. Extensive simulation results by means of AMESim confirm that this control scheme results in excellent ability against disturbance, as the same time, with the advantage of simple structure and easy of application.
A hardware-in-loop simulation system via line of sight angle for MMW guidance and relative simulation method are presented. The simulation system is made up of a small quantity of hardware and is proved to be feasible...
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ISBN:
(纸本)9783037854648
A hardware-in-loop simulation system via line of sight angle for MMW guidance and relative simulation method are presented. The simulation system is made up of a small quantity of hardware and is proved to be feasible by analyzing its system error theoretically. The effectiveness of the simulation system and method presented are tested by several experiments and the experiment results are proved to be authentic.
作者：
Dong, ZheTsinghua Univ
Inst Nucl & New Energy Technol Beijing 100084 Peoples R China
Due to the inherent safety feature, the modular high-temperature gas-cooled nuclear reactor (MHTGR) is proper to be utilized to build a new generation of nuclear power plants. Motivated by the large scale closed-loop ...
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ISBN:
(纸本)9781457705472;9781457705465
Due to the inherent safety feature, the modular high-temperature gas-cooled nuclear reactor (MHTGR) is proper to be utilized to build a new generation of nuclear power plants. Motivated by the large scale closed-loop stability provided by nonlinear controllers, a nonlinear output feedback power-level control based on both the techniques of feedback dissipation and well-established backstepping is given in this paper. The virtue of this controller, i.e. the ability of globally asymptotic stabilization is based on the inherent zero-state detectability property of the dynamics of the MHTGR. This controller is then simplified to a proportional output feedback controller which guarantees strong stability performance if the uncertainty of control rod dynamics is small enough. This simplified power-level controller has chosen to be the practical implementation strategy. Verification results provided by the hardware-in-loop simulation show the feasibility of this simplified control strategy.
Small cylindrical object navigating near free-surface is subject to wave disturbance. Wave disturbance can dramatically influence the depth control of the near-surface navigating object. A self-regulating fuzzy depth ...
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ISBN:
(纸本)9783037852842
Small cylindrical object navigating near free-surface is subject to wave disturbance. Wave disturbance can dramatically influence the depth control of the near-surface navigating object. A self-regulating fuzzy depth control method is proposed to keep the small cylindrical object navigate at the expected depth under free-surface disturbance. The near-surface dynamic model of the cylindrical object is presented and the fuzzy depth control method is modeled. The results obtained by a series of hardware-in-loop simulations demonstrate that the self-tuning fuzzy depth control method is valid to keep the small cylindrical object navigate steadily in the expected depth under free-surface disturbances.
This paper Studies attitude control of the ESMO satellite using six reaction thrusters. Bang-bang control with dead-zone and Pulse-Width Modulation (PWM) for the modulation of the on-time of the thrusters are treated....
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This paper Studies attitude control of the ESMO satellite using six reaction thrusters. Bang-bang control with dead-zone and Pulse-Width Modulation (PWM) for the modulation of the on-time of the thrusters are treated. Closed loophardware-in-loop simulations, using the microcontroller unit (MCU) Microchip PIC181F452 for implementation of attitude control and MatLab in a standard PC for simulating satellite dynamics, are carried Out. Results for real time simulation are compared with autonomous simulations. The controller gives a satisfactory performance in the real time environment.
This paper evaluates the performance of an industrial power electronic building block (PEBB) controller in a large scale all electric ship power system by means of real-time hardware in the loop (RT-HIL) simulation. A...
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ISBN:
(纸本)0780392590
This paper evaluates the performance of an industrial power electronic building block (PEBB) controller in a large scale all electric ship power system by means of real-time hardware in the loop (RT-HIL) simulation. As an example relevant to future all electric navy ships, transients originating from the charging circuit of a puls power load integrated with the prolusion motor drive and its impact on the system are studied. Different solutions to mitigate the impact by coordinating the power sharing between the pulse load's energy storage system and the ship propulsion motor drive are proposed and evaluated. The second part of the paper discusses how the RT-HIL tool can be used for system-wide performance optimization. Experimental results show the effectiveness of this method in finding the optimal parameter setting for the voltage loop control. It is concluded that due to distinct advantages of the RT-HIL method over conventional (off-line) simulations for system response analysis as well as for performance optimization, RT-HIL shall be employed more rigorously for electric ship system designs in the future.
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