摘要
曲轴作为压缩机的关键部件,其扭转振动是引起压缩机共振故障的重要因素。针对大型往复式压缩机曲轴复杂的结构特点和曲轴扭转振动的实际情况,提出具有连续分布质量的等截面轴和弯曲梁相组合的曲轴扭振模型,以曲柄臂和等截面轴的扭转振动微分方程为基础,推导给出了计算曲轴扭振固有频率的状态方程。大型曲轴实例分析结果表明,此方法的计算精度优于传统的集中质量模型、阶梯轴模型,非常接近有限元结果,适合大型往复式压缩机轴系的快速设计计算。
Crankshaft plays an important role in torsional-vibration destruction of compressor. Considering the structural features and the actually torsional-vibration situation of a large reciprocating compressor crankshaft,it puts forward a continuous mass model consisting of a homogeneous shaft with identical cross section and bent beam. Based on the vibrational differential equation of crank web and homogeneous shaft,a formula of natural frequency function is derived. Result of the example analysis shows that this formula is close to the finite element results,which possesses a higher accuracy than ordinary lumped-mass model and stepped shaft model and suitable for engineer design and calculation of large reciprocating compressor crankshaft.
出处
《机械设计与制造》
北大核心
2016年第4期228-230,共3页
Machinery Design & Manufacture
关键词
往复式压缩机
曲轴
扭转振动
分布质量模型
Reciprocating Compressor
Crankshaft
Torsional Vibration
Continuous Mass Model
