The mechanism and methods of viscosity drag reduction are briefly discussed. Some of its applications for saving energy and materials, improving efficiency or reducing noise and vibration are given.
本文综述了几种粘性减阻方法及其减阻的机理，联系了其在水相、油相中节约能源、材料，提高速度和效率等方面的应用。
In this paper, the mechanism of flow noise production and the methods of flow noise reduction are presented.
本文阐述了水下流噪声产生的机理以及物体表面状态性能对湍流边界层的影响。
Based on experimental research of porous elastic road surface (PERS) in Japan, the noise reduction properties and mechanism are analyzed from porous absorption and damping vibration.
结合多孔弹性路面的试验研究，从多孔吸声和阻尼减振两个角度分析了其降噪机理和性能。
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