Study on nonlinear dynamics characteristics of electrohydraulic servo system

Abstract

The electrohydraulic servo system (EHSS) has been widely utilized in industry and national defense. However, it is a complex dynamics system composed of many parts. The anomalies are easy to happen in operation, such as nonlinear vibration, noise, impact and so on. These anomalies significantly influence the stability of EHSS. Hence, in order to reveal the incentives, a nonlinear dynamic model was established. Then, the bifurcation characteristics and typical nonlinear dynamics behaviors implied within system were revealed. Moreover, the dynamic signals were measured from an experimental system and deeply analyzed by the effective methods of nonlinear dynamics. Results indicate that the variation of excitation force, spring force nonlinear term and damping can result in complicated nonlinear dynamic behaviors. The measured vibration signals of EHSS possess chaotic characteristic. Therefore, EHSS is a nonlinear dynamic system. This research provides a potent base for the study on nonlinear dynamics behavior of EHSS and makes the comprehensive analysis on nonlinear dynamics characteristics of EHSS become closer to reality.