压缩机连杆的静态及模态分析

Static and Modal Analysis on Connecting Rod of Refrigerator Compressor

为改善冰箱压缩机的工作性能,避免压缩机连杆在工作过程中因振动而失效,采用ANSYS软件对压缩机连杆进行了静态和模态分析。静态分析表明,变形主要发生在连杆小头,大头承受较小的变形。连杆处于最大压缩工况时,其大头与杆身的过渡部位存在应力集中的现象;处于最大拉伸工况时,其小头内表面存在最大的应力。在连杆的自由模态固有频率结果中,6阶之后的固有频率才是连杆结构产生弹性变形并发生振动的固有频率。通过对连杆的约束模态前6阶振型分析得出,1阶和2阶模态振型的固有频率相近,且均未发生变形,4~6阶模态振型中均存在着不同程度弯曲变形,且固有频率相差较大,振动不会叠加。

In order to improve the working performance of refrigerator compressor and reduce the failure of the connecting rod of compressor in the working process due to vibration,the static analysis and the modal analysis on the connecting rod of compressor are performed using ANSYS software.The result of the static analysis shows that the deformation occurs mainly in the smaller end of the connecting rod,the larger end of the connecting rod bears the minor deformation.When the connecting rod is in the maximum compression operating condition,the stress concentration exists in the transition part between the larger end and the rod body.Under the maximum tension operating condition,the maximum stress exists on the inner surface of the smaller end.In the results of natural frequency of the connecting rod＇s free modal,the natural frequency after the sixth phase is the one that makes elastic deformation and vibration of the connecting rod structure.The constraint modal analysis of the first six phases of the connecting rod shows that the natural frequencies of the first and second phase of modal shapes are close and are without deformation; from the fourth to sixth phase of modal shapes,varying degrees of bending deformation exists.And there is great differences between natural frequencies,the vibration will not stack.