直升机舱内噪声预估与分析

结合直升机自身结构特点,采用统计能量分析方法,建立了机械噪声和气动噪声中高频预测分析模型。通过对试验测量结果的分析,获得了直升机主要噪声源的声场能量频率分布特性以及壁板机身结构的振动水平,并以此作为模型的输入,预估了直升机驾驶舱内噪声响应特性。同时,根据计算结果分析了影响直升机舱内噪声的主要能量传递途径,并提出了相应的减振降噪措施。

Prediction and Analysis of Helicopter Cockpit Noise

Abstract The mechanical and aerodynamic noise analytical models were built by statistical energy analysis method, according to the characteristics of the helicopter. The energy distribution of surface noise sources and the vibration response of airframe were obtained by analyzing experimental data and then used as the input conditions for the models. The noise response in cockpit was predicted in average form. Additionally, the primary energy transfer paths to cockpit noise response were brought out by comparison of different energy contributors. At last, corresponding measures for reducing cockpit noise were analyzed, which are useful for practical projects.