含串联非线性能量汇的整星系统吸振效果研究

Here, in order to improve dynamic environment of a satellite in launching stage, a nonlinear energy sink device was introduced into the satellite adapter structure, it was coupled with the main structure of the satellite to realize the whole satellite system's vibration suppression. For the equivalent lumped mass model of the whole satellite system after coupled, considering influences of the nonlinear energy sink's gravity on nonlinear spring restoring force, using the 4th order Runge-Kutta method, vibration responses of the whole satellite system under harmonic excitation and impact excitation were solved. Results showed that vibration responses considering gravity are more accurate than those without considering gravity, their amplitudes are a bit smaller; to further lift the nonlinear energy sink device's vibration suppression efficiency without changing original natural frequencies of the whole satellite system, a nonlinear energy sink device with the same mass and a two-stage series structure was adopted, and its nonlinear stiffness parameters were optimized based on the theory of target energy transfer. The analysis results showed that the nonlinear energy sink with 2-stage series structure can have better vibration reduction effect than the one with a single-stage structure can under impact excitation.