飞机噪声预测和分析

PREDICTION AND ANALYSIS OF AIRCRAFT NOISE

根据中国民航规章中有关飞机适航噪声审定的要求和噪声预测原理建立了飞机噪声预测系统软件。该软件除可预测飞机适航噪声审定的起飞、进场和边线有效感觉噪声级外,还可计算巡航过程机体表面声压分布。各种噪声源的声功率在软件中均可单独计算,因此改变发动机和飞机参数可以考查这些参数对声功率的影响;对发动机和飞机设计有参考价值。通过算例计算出的起飞、进场和边线有效感觉噪声级与实测结果符合较好,能很好地满足工程应用需要。

According to the requirement of aircraft noise certification of CCAR and the foundation of aircraft prediction, a program system for aircraft noise prediction (ANPS) has been developed. This system can be used to calculate the aircraft take-off, approach and side-line noise (EPNL) for the purpose of aircraft noise certification, and to calculate the sound pressure and spectrum at airframe surface in cruise flying. The sound power of every source can be calculated separately by the system; therefore, the effects of design parameters for engine and aircraft on the sound power can be inspected through change in these parameters. The calculated effective perceived noise levels of aircraft take-off, approach and side-line are in agreement with measurement results, so this system can make service for aeronautical engineering satisfactorily.