This paper investigates a relative coupling control strategy based on the sliding mode controller to solve the problem of poor synergy performance of the axes of the dynamic seat during operation and to realize the multiaxis servo synergic control with variable proportions during the operation of the system. Firstly, the proposed method is theoretically proven to be accurate in eliminating tracking errors and synchronization errors between servos in the process of system operation. Secondly, the system simulation model is built in the Simulink simulation environment of MATLAB. On one hand, the final simulation result verifies the accuracy of the theoretical proof. On the other hand, the control strategy is characterized by fast convergence, high synchronization accuracy, and strong robustness; thus, the system has excellent synergy performance. Finally, the motion control platform of the dynamic seat was built for physical verification. The experimental result shows the effectiveness and feasibility of the control strategy.
In networked control system (NCS) where control loop is closed over communication network, limited data rate may deteriorate control performance even destabilize the control system. In this paper, performance analysis of a typical second-order control system with data rate constraints is conducted, and the concept of critical data rate (CDR) is presented. In order to find the CDR in NCS, an approximate searching method is proposed to guarantee acceptable control performance.
Based on the vehicle dynamics theory, the 2-DOF active suspension model was studied to establish its dynamic model and the road model. Besides, the fuzzy controller were designed with dynamic deflection of the suspension as the controlling object. The 2-DOF active suspension model was established in Adams/View and the stochastic uneven road model was established in Matlab/Simulink in combination of the fuzzy controller to joint CO-Simulation analysis . The results show that the active suspension can effectively suppress vehicle vibration, and improve the riding performance and security.
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