针对现行单次飞行事件噪声等值线计算中存在的需要布点、插值繁琐等缺点,提出单次飞行事件噪声等值线的分段函数计算模型,将航迹各分段产生的噪声等值线表示成函数形式.该模型具有在计算单次飞行事件噪声影响等值线时不需要布点、程序设计简单等优点.根据某型飞机的基础飞行数据,将分段函数模型与常规模型的计算结果进行了对比,结果表明两种模型的计算误差在±1%之内,从而验证单次飞行事件噪声等值线分段函数模型的有效性.该方法在机场噪声影响范围评价中值得推广.%To overcome the defects of stationing needs and the bothersome interpolation in current noise contour calculation for single flight event, a sub-function mathematical model is proposed.In this model, the aircraft noise contour of different flight path subsection is expressed as several sub-functions.This model has such advantages that stationing is not necessary and it is easy for programming and designing in the process of noise contours calculation.Using a certain type aircraft flight data, the noise contour is computed based on the sub-function model.And the result of computation is compared with that using the current noise contour calculation method.The relative difference between them is less than 1％.Thus, the validity of the new model is proved.This new model is worth promoting in evaluation of aircraft noise.
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