【作者】 乔渭阳； 王伟； 武兆伟； 李文兰；

【Author】 QIAO Wei-yang WANG Wei WU Zhao-wei LI Wen-lan (School of Power and Energy,Northwestern Polytechnical University,Xi’an 710072,China)

【机构】 西北工业大学动力与能源学院；

【摘要】 研究了飞机APU排气噪声的降噪设计,建立了排气管道的微穿孔板吸声结构几何参数、气流参数等与吸声特性参数之间的关联关系,发展了排气管道微穿孔板吸声结构的理论设计方法。基于飞机现场测量得到的APU排气噪声的基本特征,完成了新舟60飞机APU排气管道微穿孔板吸声结构的设计加工。在新舟60飞机APU排气管道上的实际应用和现场实验测量分析表明,本文设计的排气管道吸声结构有良好的降噪效果,APU轻负载工作状态下,所有测点的空间平均A加权声级平均降低7.16 dB,APU满负载工作状态下,所有测点的空间平均A加权声级平均降低4.32 dB,在飞机舱门位置可以降低噪声3.5～4 dB。更多还原

【Abstract】 A theoretical design and the experimental analysis of the micro-perforated absorber for the reduction of aircraft APU noise was presented in this paper.The theoretical analysis formula to calculate the coefficient of sound absorption of mi- cro perforated absorber was firstly given.Based on this theoretical formula,a micro perforated absorber used to reduce ex- haust noise of flow duct was designed and was used in the noise reduction for the airplane MA60 APU.Experimental results of the spectra and directivities of the MA60 APU noise show that the APU noise was obviously reduced with the using of this micro perforated absorber.The sound pressure level at the cabin door of the airplane is reduced about 4 dB.更多还原