The wheels will idle when the relative slipping speed between the wheel and rail exceeds the reference slipping speed. In order to avoid this phenomenon, the simplified model of wheel-rail traction torque transmission...
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ISBN:
(纸本)9783037852958
The wheels will idle when the relative slipping speed between the wheel and rail exceeds the reference slipping speed. In order to avoid this phenomenon, the simplified model of wheel-rail traction torque transmission was established. And the adhesion coefficient and vehicle velocity are got through the disturbance observer. Then the recursive least squares method was used to forecast the slope of the adhesion-slip curve. sliding variable structure controller was used to control the error of wheel velocity and reference velocity. From the results of simulation, this method can be effective to maintain the adhesion coefficient around the maximum. And the slipping speed approached the reference value, so the damage for wheel and rail was effectively prevented which achieved the desired effect.
In order to achieve the target of no-load cutting-in smoothness and security of double-fed induction wind generator, a control strategy based on combination of integral variablestructurecontrol and field-oriented ve...
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ISBN:
(纸本)9781424427994
In order to achieve the target of no-load cutting-in smoothness and security of double-fed induction wind generator, a control strategy based on combination of integral variablestructurecontrol and field-oriented vector control is presented. So as to get a better dynamic performance and robustness in disturbance, the sliding model variablestructurecontroller is used to control rotor current before cutting-in on the basis of establishment of wind turbine model with variable parameters. For the chattering of current, produced by variablestructurecontrol, the saturation function is employed to switch control and the integral transform is used to eliminate steady-state error, which can make the system produce quasi slide mode movement and reduce the distortion rate of controlled voltage. Finally, the proposed method is simulated with MATLAB/simulink and the results shows that the method can control the variable-parameters wind turbine model robustly.
The guiding principle and composition of CyberCar based on machine vision was introduced. Applying IM sequence signals as input response signals and least squares method to establish the dynamic equation for CyberCar ...
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ISBN:
(纸本)9781424417612
The guiding principle and composition of CyberCar based on machine vision was introduced. Applying IM sequence signals as input response signals and least squares method to establish the dynamic equation for CyberCar steering system by system identification experiments firstly, and then combined with the preview kinematics model and two-degree steering dynamic model of vehicle. Therefore, the steering control mathematics model based on preview kinematics for CyberCar was established. And then the switching hyper plane is designed by applying the optimal control theory, during the change of the curve curvature radius is little, the curve tracking of the intelligent vehicle is carried out by adopting sliding variable structure controller. Aim at the parameter uncertainty of tire, a vehicle steering system uncertain model was founded and analyzed. A H-infinity optimal controller is designed with the method of H-infinity control theory to solve the problem about model uncertainty. The simulation and experiment results show that the controller designed by the proposed method has good robustness and adaptability;it can trace the path steadily and reliably.
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