飞机舱内噪声综合治理技术

针对某国产飞机改装中遇到的舱内噪声问题,进行了飞机舱内噪声空测,摸清了噪声的属性,在声学试验室对国内外多种先进的降噪材料进行了性能摸底和对比试验,并针对螺旋桨飞机降噪特点专门研制了皱褶芯材夹层板这一集隔声和装饰功能于一体的新型材料.为了在地面真实地模拟和测试螺旋桨飞机的舱内噪声,提出了一种混响室-消声室隔声性能试验方法,利用一个废弃的机身段,进行了降噪效果验证试验,对比了各种降噪材料在不同组合下的降噪效果,在此基础上,确定了多种组合降噪措施综合使用的降噪方案.经机上应用和空中试飞表明:降噪效果达到了要求.

Integrated methods for cabin noise control

When a domestic propeller aircraft was modified to an aerial testing platform, the cabin noise was too high to suffer. The characteristics of original cabin noise were tested in flight condition. The performance of various advanced noise descending materials were tested and compared in an acoustic laboratory. According to the noise speciality of propeller aircraft, a totally new anti-noise crease plate which can segregate noise and decorate the cabin was developed. To simulate and test the cabin noise of propeller aircraft authentically, a method called sound segregate performance test within noise reverberation chamber-noise elimination chamber was suggested. The combination effect of various noise descending materials was verified in an abandon section of fuselage. Based on the test result, the integrated methods for cabin noise control were determinated. Flight test of the modified aircraft shows that the methods are quite effective.