一、引言民机座舱的降噪处理是一项复杂的工作。随着航空运输业的迅速发展,对运载旅客的飞机座舱微环境的舒适性提出了更高的要求,噪声作为影响座舱环境舒适性的重要因素之一,越来越引起人们的高度重视。过高的噪声使旅客极不舒适。对座舱噪声进行综合治理,应从以下两个方面着手:首先要弄清噪声源的特性及分布;其次对噪声的传播途径进行识别。民机舱内噪声主要来自:涡轮机噪声、排气噪声、机体气动噪声、结构振动噪声、设备噪声、附面层噪声等,它们分别通过空气和机体结构 First, the introduction of civil aircraft cockpit noise reduction is a complex task. With the rapid development of air transport industry, higher requirements are placed on the comfort of micro-environment of aircraft cockpits carrying passengers. As one of the important factors that affect the comfort of cabin environment, noise has drawn more and more attention. Excessive noise makes the traveler extremely uncomfortable. Comprehensive management of cockpit noise should proceed from the following two aspects: first of all, to clarify the characteristics and distribution of noise sources; secondly, to identify the way of noise transmission. Civil aircraft cabin noise comes mainly from: turbine noise, exhaust noise, body aerodynamic noise, structural vibration noise, equipment noise, surface noise, etc., respectively, through the air and body structure