非线性隔振系统振动特性分析  

RESEARCH ON THE VIBRATION CHARACTERISTICS OF NONLINEAR LSOLATION SYSTEM

作　　者：黄志伟[1] 何雪松[1] 陈志刚[1] 杜堃[1] 

机构地区：[1]中国舰船研究设计中心船舶振动噪声重点实验室,武汉430064

出　　处：《动力学与控制学报》2013年第3期252-256,共5页Journal of Dynamics and Control

摘　　要：在舰艇振动较大的部位加装隔振系统是提高其自身声隐身性能最有效、最常用的方法之一，而混沌隔振方法可以很好地提高舰船线谱的隔振能力．以双层隔振系统为对象，建立两自由度非线性隔振系统的动力学模型，研究系统振动传递率特性及刚度对隔振效果的影响，采用数值积分方法分析不同激励幅值f1下系统随频率甜变化的分岔规律及非线性动力学行为．结果表明，当f1=12．0时，双层混沌隔振系统在1．11～1．18倍频区域出现混沌运动，该特征可以有效地降低结构噪声中的线谱成分，其整体隔振性能良好，验证了基于混沌理论的线谱控制方法的有效性．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 two-degree-of-freedom vibration isolation system with nonlinear spring was estab- lished. The vibration transmissibility and the isolation effectiveness of the system are analyzed. Bifurcation dia- grams of the system with different excitation amplitude fl 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 fl = 12.0, and the reduction of the line spectrum in chaotic state is much greater than that in non-chaotic state and the isolation effectiveness of the sys- tern is eminent. The application of chaos method in line spectrum reduction is preferably validated.

关 键 词：双层隔振系统 振动传递率 分岔 混沌 

分 类 号：TB535.1[理学—物理]