减推力飞越噪声合格审定优化方法

飞越噪声合格审定可以采用发动机减推力方式进行,不同减推力航迹对应的噪声级不同,存在最优减推力飞越噪声级;利用噪声功率距离(NPD)数据库计算不同减推力飞越噪声航迹上特征点噪声级,根据最优减推力实施点的判定原则,可以确定最优航迹及其合格审定噪声级;减推力飞越噪声优化方法可以替代飞行试验,节约噪声合格审定的时间和成本。

Optimization Method of Flyover Noise Certification with Thrust Cutback

Engine thrust cutback can be applied to flyover noise certification, sound level varies with different thrust cutback flight paths, and there exits the optimized noise level with thrust cutbacks. The noise level corresponding to typical points on each flight path with different thrust cutback point can be derived from noise-powerdistance(NPD) database. According to the optimization thrust cutback conditions, the optimized flight path and its corresponding noise level can be determined. As an alternative method for flight test, the optimization method with thrust cutback can save the time and cost of noise certification.