In order to reduce or eliminate such vibration, it must be provided with counter balanced weights that extend radically from the crankshaft centerline in the opposite direction of the crank arms.
为了减少或降低这种震动，需要把平衡重量从曲轴中心线沿着曲轴臂相反方向安置其上。
2
Any system capable of a free vibration without external force is a counter example, e. g. a wire in the piano.
任何一个无外力而能自由振动的系统就是一个反例，譬如钢琴中的一条钢丝。
3
A high performance electromagnetic counter-force actuator is designed for engine active vibration control system.