Research on Coupling Characteristics and Decoupling Control Strategy of Electrohydraulic Servo Loading System With Positional Perturbation

BW Gao and SC Du and W Zhang and XP Tang and ZH Sun, OPTIMAL CONTROL APPLICATIONS & METHODS, 46, 2459-2473 (2025).

DOI: 10.1002/oca.70009

To realize the decoupling control of the electrohydraulic servo loading system with positional perturbation, a decoupling control method of state feedback based on the improved Gray Wolf Optimization Algorithm (iGWO) is proposed, which ensures the output force accuracy of the force loading system (FLS) and the output displacement accuracy of the position system (PS). First, the coupling characteristics of the system are dynamically analyzed, and the coupling characteristics of the system are verified by simulation and experiment. Second, a decoupling control strategy of state feedback is designed. The variable convergence factor with nonlinear characteristics and positional weighting factor are introduced to the Gray Wolf Optimization Algorithm, and the elements of the state feedback matrix and input transformation matrix in the state feedback decoupling are searched for optimality using iGWO and transformed into the fitness function when the optimization algorithm is searched for optimality. The LADRC-based front controller is designed to improve the tracking accuracy and response characteristics. Finally, simulation is carried out, and the evaluation indexes of the response results of the comprehensive decoupling simulation show that the simulation effect of the decoupling control strategy of state feedback based on iGWO is better than that of the feedback decoupling, and the superiority of the decoupling control strategy of state feedback is verified.

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