The acoustic modal analysis of cavity is the important matter on vehicle NVH performance study. Identifying system mode is of importance to avoid acoustic resonance and reduce interior noise.
车室声学模态分析是汽车NVH特性研究的重要内容，识别系统模态对避免声学共振、降低车内噪声有重要意义。
It is very important to study methods for predicting propeller cavitation and induced fluctuations in order to reduce vibrations and noise on ships.
研究螺旋桨空泡及其诱导的船体脉动压力的预报方法，对于减小其引起的船尾振动和辐射噪声是极其重要的。
After that, the improvement methods are proposed to reduce the noise, and the numerical simulations and experiments are performed to study every improvement method.
根据涡流场计算结果并结合振动噪音分析，提出了改善母线桥工作噪音的措施，并对各项措施进行了数值模拟和实验研究。
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