Research on the Steam Valve Joystick Loading System and its Control Strategy

In this paper, an idea about the hydraulic loading device is proposed to simulate the working mechanical environment of the steam valve joystick. The simulation based on the mathematical model of active and passive loading system is utilized to reveal that the stiffness of connection components in loading system has an important influence on the control accuracy of the system. Additionally, the paper provides a design on the structure of the connecting components of valve stem. For the control strategy, a dual inertia link is used to stabilize the system. Besides, a compensation method of partial structural invariance is adopted to reduce the influence of redundant force in passive loading test. Finally, The development mode of control engineering based on xPC rapid control prototype model is used to validate the loading system. The simulation and experimental results show that the dual inertia link and compensation method are effective techniques, and the passive loading error can be controlled within the tolerance of 300N.