船舶推进轴系不平衡-碰摩耦合故障振动特性分析

Vibration analysis of ship propulsion shafting under unbalanced-rubbing coupling fault

针对不平衡-碰摩耦合故障引发轴系振动的问题,采用多体系统动力学法进行理论与仿真研究。首先在螺旋桨推进轴系动力学模型的基础上,推导耦合故障作用下的多柔体系统动力学方程;然后利用SolidWorks、Adams建立螺旋桨推进轴系试验台刚柔混合模型,对模型进行仿真;最后分析耦合故障作用下轴系的振动特性。仿真研究表明:不平衡-碰摩耦合故障的发生,会使得轴系的振动变得更加复杂,特征频率出现了大量的高倍转频;转速越高,出现高倍转频的现象越明显,振动越复杂。

Aiming at the problem of shafting vibration caused by unbalanced-rubbing coupling fault,the multi-body system dynamics method is used to carry out theoretical and simulation research.Firstly,based on the propeller propulsion shafting dynamic model,the dynamic equation of multi-flexible body system under coupling fault is derived.Then,SolidWorks and ADAMS are used to establish the rigid and flexible mixing model of propeller propulsion shafting test bench,and the model is simulated.Finally,the vibration characteristics of shafting under coupling fault are analyzed.The simulation research shows that the occurrence of unbalanced and rubbing coupling fault will make the vibration of shafting more complex,and a large number of high frequency conversion and some frequency division appear at the characteristic frequency.The higher the rotational speed and rubbing stiffness,the more obvious the phenomenon of high frequency conversion and frequency division is,that is,the more complex the vibration is.