基于APDL的涡旋压缩机转子组件轻量化实现

Lightweight design of scroll compressor′s rotor system with finite element method

针对涡旋压缩机的系统振动与噪声,在主轴结构简化的基础上创建了其等效力学模型;以铁木辛柯梁(Timoshenko Beam)理论为依据,利用APDL语言开发了基于参数化的转子组件有限元建模程序。通过多载荷步下的转子动力学分析,计算提取了主轴传动系统的模态参数及Campbell图,在此基础上确定了转子的1~4阶临界转速。建立了多变量条件下的动力学优化数学模型,采用零阶寻优算法对转子组件进行轻量化设计,结果将平衡铁总质量M减轻了1.041 kg,同时优化了配重质量M2,M3和偏心半径R2,R3,并提高了主轴系统前4阶的临界转速,有利于涡旋压缩机的减振降噪和高速化发展。

In view of scroll compressor＇s vibration and noise, an equivalent mechanical model of its rotor was created which based on the principal axis simplified, and the program of parametric finite element modeling for the rotor assembly was designed by APDL on the basis of Timoshenko Beam. Modal parameters and Campbell chart for the principal axis were extracted through rotor dynamics analysis with multi-load steps, and then critical speed of the rotor from 1st to 4th was confirmed. The mathematical model of dynamic optimization for the rotor with multi variables was set up, and then lightweight design of the ro- tor system was carried out with zero-order optimizing arithmetic. The results indicated that, total mass of the balance iron M was decreased by 1.041 kg and mass of balance weight M2, M3 and eccentric radius R2, R3 were improved. Besides, top four order critical speed of the rotor was also enhanced. All of those were not only beneficial to scroll compressor＇s vibration and noise reduction, but also high speed development.