压缩机振动与辐射低噪声结构分析

Analysis of structural vibration and radiation noise of compressor based on virtual prediction method

针对某往复压缩机噪声偏高问题,采用虚拟预测技术对压缩机进行了低噪声结构分析研究。首先建立了由柔性机体、柔性曲轴和刚性连杆、活塞及飞轮组成的往复压缩机的多体动力学模型。通过动力学仿真求解得到传递给机体的各种激励载荷,再根据直接积分法法求解出压缩机机体的振动响应结果,仿真得到的机体部分测点结果与实验结果吻合较好。最后根据有限元动态结果来预测其机体表面辐射噪声,计算出机体的辐射声功率与实测结果相一致。

An improved reciprocating compressor noise reduction analysis method based on virtual prediction method was presented to reduce the compressor’s overall vibration and noise.A multi-body dynamic model was established to perform dynamic simulation,which consisted of a flexible block,a flexible crankshaft,rigid connecting rods,rigid pistons and a rigid fly wheel.The loads acting on the compressor block during operation were simulated.The vibration response results of the compressor block were resolved by direct integral method.The results agreed with the test data.The block surface radiation noise was predicted via finite element dynamic results.The results indicate that the acquired radiated acoustic power is consistent with the experimental result.