Light lateral and axis and torsion vibrations do not affect the normal work, but the resonance state has severity effect to drill string.
轻微的横向、轴向及扭转振动不影响钻井的正常作业，而钻柱的共振状态会对钻井产生严重的影响。
2
To Compare the difference between the data of normal lumbar plexus nerve measured through Magnetic Resonance Neurography (MRN) with specimen.
比较正常腰丛神经的磁共振神经成像(MRN)测量数据和大体标本的差异。
3
Normal modes in the pole and important characteristic parameters such as resonance frequency and position of the displacement node are obtained using the finite element method.