变刚度曲轴弯扭耦合振动分析

发布时间：2018-01-14 13:08

本文关键词：变刚度曲轴弯扭耦合振动分析　出处：《机械设计与制造》2017年06期 　论文类型：期刊论文

【摘要】：曲轴作为压缩机的关键部件,其振动形式复杂且相互耦合。针对曲轴旋转时弯曲刚度不断变化的特性,给出了变刚度的曲轴振动模型,推导了弯扭耦合振动的非线性微分方程组并应用多尺度法求解。求解结果和曲轴实例分析表明,由于变刚度的影响,曲轴的弯曲、扭转振动发生更大振幅的耦合振动。相比定刚度解,变刚度曲轴的轴心轨迹波动、弯曲振动振幅明显增大。在扭转振动主共振时,弯曲振动也出现较大振幅,忽略变刚度因素,将造成较大的误差。
[Abstract]:As the key component of compressor, the vibration form of crankshaft is complex and coupled with each other. According to the changing characteristic of bending stiffness of crankshaft, a crankshaft vibration model with variable stiffness is given. The nonlinear differential equations of bending and torsional coupled vibration are derived and solved by multi-scale method. The results of the solution and the analysis of crankshaft examples show that the bending of crankshaft is due to the influence of variable stiffness. The torsional vibration is coupled with larger amplitude. Compared with the fixed stiffness solution, the axis trajectory of the variable stiffness crankshaft fluctuates, and the amplitude of the bending vibration increases obviously. When the torsional vibration is main resonance, the flexural vibration also has a larger amplitude. Ignoring the factor of variable stiffness will result in great error.
【作者单位】：华东理工大学机械与动力工程学院;
【基金】：国家自然科学基金资助项目(50905061) 中国博士后科学基金资助项目(2011M500554) 上海市引进技术的吸收和创新计划(产-30-方向-28)
【分类号】：TH45
【正文快照】： 1引言近年来,随着压缩机向高速化、巨型化发展,压缩机曲轴的振动问题日益突出。曲轴在运行过程中,振动形式复杂且相互耦合,具有复杂的非线性动力学特性,容易引发系统不稳定等多种振动问题,直接影响到整机的运行安全。现有的曲轴振动分析多以定刚度和具有偏心质量的Jeffcott转

【相似文献】