应用模态分析技术、振型截断法，对专利证书号第352466号的ZJ50 J双升式机械驱动石油钻机振动特性进行研究。
Using the modal analysis method in this paper, the vibration characteristics of ZJ50J double-lifting mechanical driven oil drilling rig (patent No. 352466) is studied.
对现役钻机底座做了现场振动测试，得到频响函数曲线及前10阶模态频率。
On-site vibration test of the servicing rig substructure is made, and the frequency response function curve and preceding 10 modes frequency are obtained.
钻柱将其扭转振动传至钻机动力头，引起动力头齿轮传动系统的非线性振动。
The BHA transmits its torsional vibration to the gear system of drill power pack and brings about nonlinear vibration.
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