短舱进气道复合材料声衬声学特性试验研究

目的应用旋转声模态发生试验系统测试无缝复材声衬试验件的传递损失声学特性。方法根据短舱进气道声衬实际应用环境,采用整体环状成型工艺和无缝拼接技术,针对性地设计研制出复合材料制成的环形无缝进气道声衬。利用风扇旋转声模态发生试验系统开展基于旋转径向传声器阵列的管内声模态测试识别方法研究,并发展相应的模态测试装置。结果设计的无缝复材声衬在目标工况下降噪效果良好。结论基于旋转径向传声器阵列可同时识别径向和周向声模态,并显著减小所用传声器总数。

Acoustic Performance Test on Nacelle Inlet Composite Material Annular Acoustic Liner

The paper aims to test the acoustic characteristics of transmission loss of seamless composite acoustic liner test pieces with the rotating acoustic mode generation test system. Considering the actual potential application environment characteristic of acoustic liner in the aero-engine nacelle inlet, the seamless annular acoustic liner made of composite materials was designed and developed by the whole circle forming process and seamless stitching technology. Based on the spinning radial microphone array, the method and the test rig of acoustic mode test and identification were developed by applying in rotating acoustic mode generation test system. The corresponding mode test device was developed. The experimental results showed that the designed seamless composite acoustic liner has a good noise reduction effect under the target condition. The spinning radial microphone array can both identity the radial and circular acoustic mode and apparently reduce the microphones used.