基于统计能量法的排气管道系统的振动和噪声分析与研究

基于统计能量分析(SEA)原理,结合压缩机排气管道系统的实际结构尺寸建立了SEA模型。采用理论及经验结果讨论了统计能量分析法三个重要参数确定,利用现场测试壳体加速度来确定输入功率。运用AutoSEA2004仿真软件预测了距离管道系统外部一定距离的声压级,并与现场测试所得数据进行了对比分析,结果表明,预测管道系统的总声压级为102.7dB(A),比实测结果低4.2dB(A),在500 Hz以上主要频段上,预测曲线与实测曲线吻合较好,为管道系统噪声治理提供了数值仿真依据。

Vibration and noise analysis of an exhaust piping system based on stastical energy analysis

A SEA model of a compressor's exhaust piping system was established based on statistical energy analy-sis (SEA) theory and actual size. In the method developed, the theoretical and experiental results were used to estimate 3 parameters of SEA and the input power was obtained from the pipe shell acceleration measurement. The sound pressure level at a certain distance out from the piping system was predicted by using the software AutoSEA2004, and then com-pared with the results from the site testing. The comparison results showed that the calculation value of the piping system's noise level is 102.7dBA, it is lower than the test result value by 4.2 dB ; the predicted curve fits well with the test curve in the main frequency band of above 500Hz. The simulation results provided a numeral simulation basis for the piping sys-tem noise control.