喷气式发动机地面静态噪声测试数据的修正方法

摘要

Noise airworthiness recertification is necessary before a derived aircraft putting into the market. Using the engine noise data of static testing to predict the flight noise level of the aircraft can save time and reduce the cost. In this article, the noise data of the testing engine is modified according to the flight condition and then used to predict the flight noise level of the aircraft. The correction factors have a direct impact on the accuracy of experimental results of from ground to flight status equivalent mapping (GTFE). The accuracy of this method is verified by comparing the results with those in the real flight test.%衍生机型要投入运营必须进行再审定。利用发动机地面静态噪声测试来预测飞行中的噪声级，可以达到节约时间和成本的目的。通过发动机在翼的试验方法，获得某型发动机的地面静态噪声数据，将静态测试数据修正到飞行状态，从而预测装配该型发动机的衍生型飞机的飞行噪声级。从地面到飞行状态等效映射中的修正因素直接影响实验结果的准确性。围绕修正因素进行研究，来验证该修正方法的准确性。