基于ANSYS Workbench的双螺杆膨胀机主箱体模态分析

Modal Analysis of Main Box of Twin Screw Expander Based on ANSYS Workbench

摘要: 双螺杆膨胀机阴阳转子与箱体之间间隙小，为避免工作过程中的共振现象影响结构间的配合精度，本文针对螺杆膨胀机主箱体结构的固有频率展开了分析。通过仿真分析得到了主箱体的前四阶振型图及其对应的固有频率，分析了其危险转速在44374~86622 r/min间变化。通过分析发现双螺杆膨胀机主箱体固有频率有效避开了其输入频率范围，分析结果可为箱体类机械结构的模态分析提供参考。

Abstract: The gap between the Yin and Yang rotor and the box body of the twin screw expander is small. In order to avoid the resonance phenomenon in the working process affecting the fitting precision between the structures, this paper analyzes the natural frequency of the main box structure of the screw expander. Through simulation analysis, the first four vibration patterns of the main box and their corresponding natural frequencies are obtained, and the changes of its dangerous speed between 44374 - 86622 r/min are analyzed. It is found that the natural frequency of the main box of twin-screw expander avoids the input frequency range effectively, the results of which can pro-vide references for modal analysis of box-like mechanical structures.