Abstract: Aiming at the chaotic characteristics of the nonlinear vibration system of giant magnetostrictive actuator , the response of the system was studied with the variation of excitation frequency and excitation force parameters. Based on the analysis of the working principle of GMA, the mathematical model of GMA nonlinear vibration system was established and the vibration equation of the system was given. The numerical simulation analysis was carried out by using Matlab software. By calculating the response of the GMA nonlinear vibration system with the excitation frequency and the excitation force parameter, the range of excitation frequency and excitation force parameters of the system was determined. The displacement time history diagram, phase diagram, Poincaré map and amplitude spectrum of GMA nonlinear vibration system were drawn by the fourthorder RungeKutta method. The ADAMS software was used to verify the simulation of the displacement time history curve. The results indicate that the GMA nonlinear vibration system has chaotic characteristics. By studying the chaotic characteristics of the system, the conclusions obtained can provide theoretical basis and technical support for the application of chaotic characteristics of the system.
Key words: giant magnetostrictive actuator(GMA); nonlinear vibration system; chaos characteristics; bifurcation