Changes of the natural characteristics of the system are caused by changes of load, and the fixed parameters of PID controller are difficult to continue to ensure a good control effect. During experiments, the different disturbance torques are generated according to the different dimension scales of the anti-rolling tanks. But the uncertainties, such as the couplings and the nonlinearty of the swing bench, make it difficult to establish the precise mathematical model of system. Generally, the PID control method can achieve an ideal control effect. Its function is to simulate the ship roll motion and to verify the performance of the anti-rolling tank. The anti-rolling tank swing bench is a typical hydraulic position servo system.
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