舰船弹性支撑轴系振动特性研究  

On vibration characteristics of ship shafting under elastic support

作　　者：尹红升 刘金林[1] 曾凡明[1] YIN Hong-sheng;LIU Jin-lin;ZENG Fan-ming(College of Power Engineering, Naval Univ. of Engineering, Wuhan 430033, China)

机构地区：[1]海军工程大学动力工程学院,武汉430033

出　　处：《海军工程大学学报》2022年第1期55-61,112,共8页Journal of Naval University of Engineering

基　　金：国家部委基金资助项目(20172B0815,2019C080744);湖北省自然科学基金资助项目(2017CFB584)。

摘　　要：为研究柔性结构对轴系振动特性的影响,以某弹性支撑轴系为研究对象,考虑到筏架柔性及气囊刚度特性,建立了弹性支撑的桨-轴-筏架-基座模型,并用力锤敲击模态试验验证了该模型的可信度,再结合有限元法计算分析了弹性支撑结构对轴系纵向振动及横向振动的影响。结果表明:在弹性边界条件下,轴系模态和振动特性在0~100 Hz范围内发生了较大变化,弹性支撑处纵向振动及横向振动响应增大,低阶固有频率显著降低;相较于刚性支撑,弹性支撑结构能有效衰减振动能量传递,但会增大轴系的局部振动响应,并在低频段引发明显的纵横耦合振动。In order to study the influence of flexible structure on the vibration characteristics of the shafting,considering the flexibility of the raft and the stiffness of the air spring,a propeller-shaft-raft-base model was established for elastic support shaft system.After verifying the credibility of the model through the hammer percussion modal test,the finite element method was used to calculate and analyzed the influence of the elastic support structure on the longitudinal vibration and cyclotron vibration of the shafting.The results show that,under the elastic boundary conditions,the shafting modal and vibration characteristics change greatly in the range of 0~100 Hz,and that the longitudinal vibration and cyclotron vibration response of the elastic support increases,whereas the low-order natural frequency is significantly reduced.In comparison to the rigid support,the elastic support structure can effectively attenuate the vibration energy transmission,but increase the local vibration response of the shafting system and cause obvious vertical and horizontal coupled vibrations in the low frequency range.

关 键 词：舰船轴系 弹性支撑 振动特性 模态验证 耦合振动 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置]