摘要
随着大涵道比发动机的广泛应用以及发动机降噪技术的发展,机体噪声在飞机总噪声中的占比逐渐增大。为了能够快速、直接地获得飞机机体在适航状态下的噪声级,利用噪声预测方法,对机体边线噪声进行了研究。由于边线噪声适航审定测量点的位置并不固定,所以通过对噪声-功率-距离(noise-power-distance,NPD)数据作插值计算从而得到边线上任意一点的噪声级,进而确定出该点的具体位置。然后结合飞行航迹,在波音方法的基础上通过修正完善建立了一套应用于噪声适航审定领域内的机体噪声预测算法。最后通过实例计算,结果表明该算法不仅能够较好地预测出在实际情况下的机体噪声,还能够直观地反映出机体噪声的指向性,而这对于后续机体降噪工作的开展以及飞机适航取证都具有十分重要的意义。
With the wide application of high bypass ratio engine and the development of engine noise reduction technology,the proportion of airframe noise in total aircraft noise is increasing.In order to obtain the noise level of airframe in airworthiness condition quickly and directly,the airframe lateral noise is studied by means of noise prediction.Because the location of the measurement point of the lateral noise airworthiness certification is not fixed,the noise level of any point on the lateral can be obtained by interpolating the NPD data,and then the specific location of the point is determined.Then,combining flight path,a set of airframe noise prediction algorithm applied in the field of noise airworthiness certification is established by modifying and perfecting the Boeing method.Finally,an example is given to show that the algorithm can not only predict the airframe noise in the actual situation,but also intuitively reflect the directivity of the airframe noise,which is of great significance for the subsequent airframe noise reduction work and aircraft airworthiness certification.
作者
闫国华
李成晨
Yan Guohua;Li Chengchen(Civil Aviation University of China,Tianjin 300300,China)
出处
《航空科学技术》
2021年第3期6-13,共8页
Aeronautical Science & Technology
关键词
机体噪声
适航状态
噪声预测
边线噪声适航审定测量点
波音方法
airframe noise
airworthiness condition
noise prediction
lateral noise airworthiness certification measurement point
Boeing method
