Strategy and loading-test of servo electro-hydraulic fatigue testing machine based on XPC system

Abstract

Fatigue testing plays a more and more important role in modern industry. In order to obtain the general features and the optimal algorithms of closed-loop control systems of the electro-hydraulic fatigue testing machines, a mathematical model of servo electro-hydraulic fatigue testing machine based on xPC real-time control system is developed and simulated in Simulink. In this model, the compound control system with feed-forward (speed feed-forward and acceleration feed-forward) is introduced. And then the static and dynamic loading testing for both position and force control are done to get the control laws and strategies. The research and results not only reveal the control laws and suitable control strategies of the fatigue-testing machine but also prove that the system has high control accuracy, fast signal processing and response ability. It can also realize the position and force control of the fatigue testing machines perfectly.