船舶推进轴系扭转振动的仿真与试验研究

Torsional Vibration Simulation and Experimental Study about the Ship Propulsion Shafting System

将船舶推进轴系简化为分支轴系系统,建立了系统的传递矩阵和频率方程,通过非线性齐次方程求根的Newton-Raphson方法,分析计算推进轴系的振型、共振转速和共振频率。建立扭振测试系统对联轴器输出端法兰处进行测试,以确定各轴段扭振应力是否低于规范限制值或确定转速禁区。测试结果显示,各简谐振动频率与相应的计算值最大误差值仅为1.7%,说明了计算模型的正确性,同时按扭振计算结果核算各轴段的扭振附加应力和扭矩,证实最大扭振附加应力出现在曲轴处,为8.75 MPa,小于规定的持续运转许用应力。

The ship propulsion shafting system is simplified to the branch shafting system. The transfer matrix and the frequency equation of the system are established. By using Newton Raphson method to solve the nonlinear homogeneous equation, the propulsion shafting vibration mode, the resonance speed and the resonance frequency are calculated and analyzed. The torsional vibration test system based on coupling output flange is established to determine whether the axis section of the torsional stress is below the specification limit or determine the speed penalty area. Test results show tha! the harmonic vibration frequency and the maximum error of the corresponding calculatiml value is only 1.7C/c . It proves the validity of calculatiml model. And it accounts the additional stress and torque of the shaft torsional vibration according to the calculation results of the torsional vibration, lit confirmed that the maximunl additional stress is in the and its torsional vibration is 8.75 MPa, which is less than the specified operatiug allowable stress.