摩擦激励下螺旋桨推进轴系自激振动特性分析  

Study on the Self-excited Oscillation of a Propeller-shaft System under Friction Excitation

作　　者：陈锋[1] 张振果[1] 张志谊[1] 华宏星[1] 

机构地区：[1]上海交通大学振动,冲击,噪声研究所,上海200240

出　　处：《噪声与振动控制》2015年第3期117-120,共4页Noise and Vibration Control

基　　金：中国自然科学基金青年基金项目(51405292)

摘　　要：水润滑轴承摩擦诱导的螺旋桨推进轴系振动是造成舰艇艉部高频振动噪声的重要诱因。针对摩擦诱导的螺旋桨推进轴系非线性自激振动特性进行研究。基于拉格朗日方程和模态叠加方法建立摩擦激励下螺旋桨推进轴系的非线性动力学方程,轴承—轴颈的动摩擦特性采用速度依赖型的Stribeck摩擦模型进行描述,同时考虑非线性摩擦、扭转振动和横向振动的耦合作用。运用Newmark-β和Newton-Raphson迭代相结合的方法求解系统非线性动力学响应。分析结果表明,在摩擦激励自激振动作用下系统动力学特性均被激发,系统的弯扭耦合振动特性易诱发螺旋桨推进轴系产生摩擦自激振动现象。Friction-induced self-excited vibration in a propeller-shaft system supported by water-lubricated stern-tube bearing was studied. Nonlinear dynamic equations of the propeller-shaft system were formulated by using the Lagrange approach in conjunction with the modal superposition technique to exhibit the excitation mechanism. The model accounted for the lateral-torsional vibrations interaction of the shaft and the bearing-shaft friction represented by the velocity-dependent Stribeck friction model in the low velocity region. Dynamic analyses were carried out using the Newmark-β method with the Newton-Raphson iteration. Analytical and numerical investigations reveal that the instability induced by the negative friction damping gives a rise to the self-excited vibrations and the lateral-torsional vibrations interaction is a reasonable source to enhance the instability.

关 键 词：振动与波 螺旋桨推进轴系 摩擦 自激振动 水润滑轴承 

分 类 号：TH311[机械工程—机械制造及自动化]