大型客机机舱内饰板隔声性能计算与试验

Calculation and Testing of Sound Transmission Loss for Interior Panels of Large Aircraft Fuselages

结合单层板与夹层板隔声理论,推导了应用于计算典型飞机机舱内饰板隔声量的分析方法。根据所推导的计算公式,将真实环境条件与内饰板材料参数代入其中,获得地面与飞行状态下的隔声量计算结果。与实测数据对比之后,发现在特定频率区域内饰板计算量值与趋势都与试验吻合较好,但在共振频率、吻合频率和压缩频率上,计算值与试验测量值有较大起伏。对比飞行与地面两种条件,飞机状态下的隔声量普遍大于地面状态。

Combining the acoustic theories of plain panel and sandwich panel, an analysis method to calculate sound transmission loss of interior panel of typical aircraft fuselages is provided. According to the sound transmission loss equations, the real parameters of interior panel are defined and put into calculation process. Then, the results of sound insulation in flight and ground conditions are obtained. It is found that the value and tendency of the sound insulation agree well with the measurement data from the testing in a special frequency range. However, there are somewhat large differences between them in resonance frequencies, coincidence frequencies and dilatation frequencies of the sandwich panel. The sound insulation effect in flight condition is better than that in ground condition.