Dynamic characteristics analysis of vibration isolation system with nonlinear energy sink on flexible foundation
For low-frequency line spectrum control in naval and other engineering fields,a nonlinear energy sink vibration isolation system dynamics model considering a flexible foundation was established,and the nonlinear dynamics of the system was analyzed using the harmonic balance method and Runge-Kutta meth-od.The influence of the foundational parameters on the amplitude-frequency characteristics of the system was explored,and the nonlinear dynamical behavior of the system at the resonant frequency was analyzed.The influence law of mass ratio,cubic stiffness,and damping on the damping effect of nonlinear energy sink was explored with vibration power flow as the evaluation parameter.For the computational model analyzed,re-search shows:when the foundation stiffness is weak,the nonlinear energy sink has a large effect on the ampli-tude and frequency response characteristics of the equipment;for specific parameters,the state of motion of the base and the equipment at the first order resonant frequency may be different;the nonlinear energy sink has a superior damping effect,reducing the peak power flow to the base by 13.95 dB in this example.
flexible foundationnonlinear energy sinkharmonic balance methodpower flow analysis
万方数据
维普
