单次飞行事件噪声等值线计算新方法的研究

The Study on New Method of Single Flight Contour Calculation

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.