Dynamics Analysis Of The Nonlinear Flexible Isolate System Simulated By The Wave

The study on the transmission mechanism of power flow in nonlinear system, which aims at the optimum control of the system dynamic performance, is one of the most challenging and prospective work in the field of vibration and noise control. The linear vibration theory has tended to the perfect situation, but it more and more cannot satisfy the actual project need. This dissertation, based on the knowledge of domestic and abroad progress in the vibration control technology, carries out a research work on the vibration transmission characteristics and control strategy in nonlinear system.Combined with nonlinear isolation theory, flexible isolation theory and power flow idea, establish a nonlinear model to the system which is comprised of ship, nonlinear isolator and wave, then have a research on the vibration control about this system, which mainly contains three parts: one is the power flow compare to the flexible foundation and rigidity foundation; anther is the effect of nonlinear damper and spring parameter to power flow; the last one is effect of the change of wave length to the power flow. About the research method, this dissertation establishes a nonlinear model to the system which is comprised of ship, nonlinear isolator and wave, uncoil the model with harmonic balance method and Newton iteration and golden division approximately, research the power flow characteristics according to the change of the parameters and then carry out the design principle to the nonlinear isolation system.It reveals the transmission mechanism of power flow in the flexible nonlinear system according to the analysis to the transmission power flow in the flexible nonlinear system and the compare to serial parameters with the transmission power flow characteristics, and then discuss the control strategy of the power flow. The research reveals: the larger rigidity the less kinetic energy transmitted to the fixed equipment; the larger spring parameter the higher peak of the according spectra, and more disadvantageous to isolation; the damping has obvious effect to Ek (kinetic energy transmitted to the fixed equipment), at low frequency, as increase the damping p, Ek decreases, but not obviously, at high frequency, as the increase of the damping p, Ek increases acutely; as the increase of the wave length , Ek increases, and the larger difference of the wave length, the larger difference of Ek.