In chapter seven, the problem of reducing vibration in the speed-down process of a rotor system is noticed and its balancing methods are discussed in detail.
第七章研究了转子系统降速过程中过临界转速时的减振问题，讨论了其平衡方法。
Based on the analyses of the vibration and noise oft he trains and its propagation law, the methods for reducing the influence of them are put forward in this paper.
在分析了铁路振动与噪声及其传播规律的基础上，列出了减小铁路振动与噪声影响的方法。
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。
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