基于声品质的直升机舱内典型降噪措施分析

直升机舱内噪声严重降低了乘员的乘坐舒适性,进行直升机舱内降噪设计研究十分必要.本文以声品质最优为目标,以直升机舱内噪声烦恼度评价结果为依据,通过多元线性回归方法构建舱内声品质模型,利用计算声学软件模拟直升机舱内添加不同种类降噪措施后的双耳可听声信号,从不同角度对典型降噪措施的效果进行测评及对比分析.结果表明:在舱内添加...

Analysis of Typical Noise Reduction Measures in a Helicopter Cabin Based on Sound Quality

The helicopter cabin noise seriously reduces the ride-comfort of passengers,so it is necessary to study the design of noise reduction in the helicopter cabin.This thesis aims at the sound quality optimization,and uses multiple linear regressions to build a sound quality model based on the evaluation of noise annoyance in the helicopter cabin.The binaural audible signals in the case of adding 12 typical noise control measures in the helicopter cabin are obtained by use of the acoustical software and used to evaluate and compare the effects of the 12 typical noise control measures from different aspects.The results show that adding perforated plates with perforation rate 13%,0.5 m thick cavity and 0.1 m thick mineral wool at the front of the cabin is the best measure for the sound quality improvement;while adding the foam rubber with carpet and latex backing attached and 5 mm-thick needle felt only has the poor effect for the sound quality improvement.From the viewpoint of the type of sound absorption measures,the sound absorption structure has the best improvement effect of the sound quality,followed by the sound absorption material and the damping material.