Nonlinear Response Characteristics of Giant Magnetostrictive-Piezoelectric Composite Sensors

The nonlinear magnetoelectric response characteristics of a giant magnetostrictivepiezoelectric composite sensor in harmonic magnetic fields are described in this paper. Nonlinear differential items are introduced to explain the hysteresis phenomena of a giant magnetostrictive material. The nonlinear dynamic model of giant magnetostrictivepiezoelectric composite sensors in harmonic magnetic fields is developed, and the dynamic response of the system is obtained. The numerical and experimental results show that there are multiple frequencies in the response of the system, and the system's motions change from periodic orbits to chaos with the increase in the level of outside excitation. The results of this study are helpful for the optimal design and improvement of giant magnetostrictive-piezoelectric composite sensors.