摘要
提高轴系扭振计算精度,必须有精确的原始参数,以准确掌握船舶轴系扭振情况。在有限元分析软件中,建立曲柄半拐等的三维模型,用有限元分析方法精确的确定了各质量、轴段的转动惯量、扭转刚度等精确原始参数。基于建立的实船轴系当量系统,计算出了各结自由振动的频率及对应的共振转速,自由端和飞轮输出端的振幅,分析了轴段应力和扭矩随曲轴转角及转速的变化关系。结果表明在整个转速范围内,扭转振幅小于限定值,轴段的最大扭矩和应力均小于材料许用值,本船舶轴系扭转振动状况是良好的。
The precise original parameters are critical for improving the calculation accuracy of shaft torsional vibration.A three-dimensional mode of a half crank is established in the finite element analysis software to accurately calculate the original parameters such as the moment of inertia and torsional stiffness of each shaft section.Based on the established real ship shafting equivalent system,this paper calculated the free vibration frequency and the corresponding resonance speed,as well as the vibration amplitude of the free end and the flywheel output end,analyzed the relationship of the stress and torque of shafts and the crank angle and engine speed.The results show that in the whole speed range,the torsional amplitude is less than the allowable value and the largest shaft torque and stress are less than limited value of the material.So that the ship shafting torsional vibration is in a good situation.
出处
《船舶》
2011年第5期46-49,共4页
Ship & Boat
关键词
船舶推进轴系
有限元
转动惯量
扭振
marine propulsion shafting
FEM
inertia moment
torsional vibration
