Event-triggered control for hydraulic servo systems with asymmetric time-varying output constraint
GONG Chi-kun
RU Qing-yang
YUAN Li-peng
Abstract：In response to issues such as unknown nonlinearities,unmodeled dynamics and limited communication network bandwidth in hydraulic servo systems,a robust control method with asymmetric time-varying constraint command filtering and adaptive event triggering is proposed.Compared to conventional static constraints on the output displacement of hydraulic servo systems,this control method ensures that the output displacement of the hydraulic servo system remains within preset asymmetric time-varying constraints,even in the presence of unmodeled dynamics.For unknown functions in the hydraulic servo control system,the radial basis function(RBF)neural network adaptive approach is utilized for approximation and compensation.The introduction of an event-triggering mechanism means that control inputs are no longer continuously updated,thereby making efficient use of limited communication resources.A novel filtering error compensation mechanism is constructed,which not only converges within a finite time,but also overcomes the issue of chattering.The global boundedness of the closed-loop system is proved by using the Lyapunov method.Simulation examples demonstrate the effectiveness of the control method.
Keywords：unmodeled dynamicsasymmetric time-varying constraintrobust controlradial basis function networksevent-triggered controlfinite time convergence
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 979-988 )