民用飞机发动机噪声辐射特性研究

摘要

In order to study the engine noise radiation characteristics of civil aircraft on the cruise state, a similar transformation law was used in which the engine state parameter measured on ground work was transfered to one of the flight state. Analyzing two known aircraft engines, the engine noise pressure level changes corresponding to the ground test state and the air cruise state were investigated with different speed and the radiation angle, and the noise radiation field change rule of these two kind of state was obtained.%为了探索民用飞机在巡航状态下发动机噪声的辐射声场特性,利用相似转换法则将易于测量的发动机地面工作状态参数转换到飞行状态下发动机工作状态参数,通过分析两个已知飞机发动机型号,变换其转速以及辐射角度,研究发动机在地面试验状态与空中巡航对应状态下噪声声压级的变化,由此探索和了解两种状态下的噪声辐射声场变化规律.