振动和冲击是液压平衡回路使用中常出现的问题，直接影响到液压系统的正常工作。
Being a very obvious problem of hydraulic balancing circuit, vibration and impulse affect the normal work of hydraulic system directly.
振动是影响水力机组正常运行和危害机组寿命的主要故障。
Vibration is the main fault which affects the regular run and endangers the life-span of hydropower unit.
本文指出螺旋弹簧有偏离中心的弹性作用，是引起车辆不正常振动和摇枕纵向挡严重磨损的一个重要因素。
This paper sets forth the fact that the eccentric action of coil spring is an important factor in the causation of abnormal vibration of vehicle and severe wear on bolster guide.
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