CAJ | 학술논문

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。
수윤활축승마찰유도적라선장추진축계진동시조성함정미부고빈진동조성적중요유인。침대마찰유도적라선장추진축계비선성자격진동특성진행연구。기우랍격랑일방정화모태첩가방법건립마찰격려하라선장추진축계적비선성동역학방정，축승—축경적동마찰특성채용속도의뢰형적Stribeck마찰모형진행묘술，동시고필비선성마찰、뉴전진동화횡향진동적우합작용。운용Newmark-β화Newton-Raphson질대상결합적방법구해계통비선성동역학향응。분석결과표명，재마찰격려자격진동작용하계통동역학특성균피격발，계통적만뉴우합진동특성역유발라선장추진축계산생마찰자격진동현상。
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.