基于有限元的轴系回旋振动响应计算及试验

为更好地了解轴系振动对舰船声辐射的影响,以某台架轴系为研究对象,基于Workbench软件建立仿真分析,对轴系回旋振动涡动频率及响应和轴系振动对轴承基座的影响进行研究。研究表明,有限元法计算所得回旋振动的固有频率与传统的传递矩阵法结果一致。通过轴系激励力的分析,给出有限元法回旋振动响应的分析方法,获取轴系振动的位移响应。提取轴承处频域激励力施加于尾轴承上,得到尾轴承基座上点的振动响应加速度。设计台架测试方案,通过试验验证轴系振动的位移响应和轴承基座振动加速度响应计算的正确性。基于有限元的轴系回旋振动涡动频率及响应提出的计算方法,可为推进轴系振动对舰船声辐射的研究提供一定的理论指导。

Calculation and Test of Shafting Cyclotron Vibration Response Based on Finite Element Method

In order to better understand the impact of shafting vibration on the acoustic radiation of ships, a certain test-bench shafting is taken as the research object, and the simulation analysis is established based on the Workbench software to study the vortex frequency and response of shafting cyclotron vibration, and the impact of shafting vibration on the bearing base. The results show that the natural frequency of cyclotron vibration calculated by the finite element method is consistent with that of the traditional transfer matrix method. Based on the analysis of shafting excitation force, the analysis method of finite element method cyclotron vibration response is given to obtain the displacement response of shafting vibration. The frequency domain excitation force at the bearing is extracted and applied to the stern bearing to obtain the vibration response acceleration at the point on the stern bearing base. The test-bench test scheme is designed to verify the calculation correctness of shafting vibration displacement response and bearing base vibration acceleration response through tests. The calculation method according to the vortex frequency and response of shafting cyclotron vibration based on the finite element method can provide a certain theoretical guidance for promoting the research of shafting vibration on the acoustic radiation of ships.