降低飞机边线有效感觉噪声级的方法

Research on the Method of Reducing the Aircraft Lateral Effective Perceived Noise Level

为了使新飞机能够满足越来越严格的噪声适航审定要求,需要降低飞机三个噪声测量点的有效感觉噪声级。以边线噪声测量点为研究对象,研究飞机边线有效感觉噪声级的影响因素,提出降低飞机边线有效感觉噪声级的方法。采用飞机边线噪声预测算法进行方法有效性验证,结果表明增大发动机涵道比、减小飞机起飞推力并增加机翼面积是一种可行的降低飞机边线有效感觉噪声级方法。

In order to meet the stringent requirements of noise airworthiness approval for the new aircrafts,it isnecessary to reduce the effective perceived noise level(EPNL)at the three noise measurement points of the aircraft.In thispaper,taking lateral noise measurement point as the research object,the influencing factors of the lateral EPNL of theaircraft are studied.The method to reduce the lateral EPNL is put forward.Noise prediction algorithm for the lateral noise isused to verify the effectiveness of the method.The results show that increasing engine bypass ratio,reducing takeoff thrustand increasing wing area are the feasible measures for aircraft lateral EPNL reduction.