To reduce the radiated waterborne noise and improve the capability of acoustic stealth of ships, the method can be implemented conveniently and effectively by inserting isolators between the vibration source and the base. A dynamic model for twodegreeoffreedom vibration isolation system with nonlinear spring was established. The vibration transmissibility and the isolation effectiveness of the system are analyzed. Bifurcation diagrams of the system with different excitation amplitude f1 were gained and the dynamic behaviors with different excitation frequencies ω were also obtained by numerical method. The research results reveal that chaotic motion of the system appears at the 1.12~1.18 frequency component when f1=12.0, and the reduction of the line spectrum in chaotic state is much greater than that in nonchaotic state and the isolation effectiveness of the system is eminent. The application of chaos method in line spectrum reduction is preferably validated.
黄志伟,何雪松,陈志刚,杜堃.非线性隔振系统振动特性分析[J].动力学与控制学报,2013,11(3):252~256; Huang Zhiwei, He Xuesong, Chen Zhigang, Du Kun. Research on the vibration characteristics of Nonlinear Isolation system[J]. Journal of Dynamics and Control,2013,11(3):252-256.