On the basis of the analysis of the twistingvibration of rotary sucher-rod string, a formula of calculating every harmonic vibration eigenfrequency is presented.
在对旋转抽油杆柱的扭转振动分析的基础上，给出了各阶扭转振动固有特性参数的计算式。
2
A general model is developed to analyze drill string vibration considering the coupled relations between longitudinal vibration, lateral vibration, and twistingvibration.
考虑钻柱的纵向振动、横向振动及扭转振动之间的耦合关系，建立了钻柱振动分析的综合模型。
3
After slipping of crank shaft sleeve in large Marine diesel engine, there will appear obvious vibration and twisting on the hull and shaft system.