Describes drill string dynamics system models and numerical algorithms. And describes the details of NEWMARK method and HHT method.
介绍了钻柱系统动力学模型以及其数值算法，对直接积分法中的NEWMARK法和HHT法的计算过程进行了详细的阐述。
A problem about tubing string vibration caused by the fluid unsteady flow inside tubing string is studied from the Angle of solid liquid coupling vibration in dynamics.
文章从动力学中固液耦合振动的角度出发，研究了油管柱内流体不稳定流动引起的油管柱振动问题。
The quark-fragment effects in the source term are described by using the phenomenal SU(3 ) string model with a flavor dynamics.
源项中的夸克碎块效应则是通过唯象SU（3）弦模型味动力学进行描写的。
Dynamic vibration equation of drilling string is established based on the theory of dynamics.
根据动力学理论建立钻柱动力学振动方程。
For fluid dynamics parameters, media properties of check valve performance relationship in China, in order to promote the drill string check valve research theory and technology progress.
寻求流体动力学参数、介质性质对止回阀性能的影响关系，以推进我国钻柱止回阀研究理论和技术进步。
Finally, in order to control the well path by dynamics, great attention should be paid to the interaction between bit and drill string.
为了实现依据钻柱动力学的井眼轨迹控制，应特别重视钻柱振动特性与钻头受力状况的相互影响。
The dynamics of roller cone bit under the interaction of drilling string, bit and rock during the drilling process was investigated.
研究了钻井过程中钻柱、钻头、岩石相互作用下的牙轮钻头动力学特性。
On the system dynamics, the dynamics model for roller cone bit under the interaction of drilling string and rock was established.
从系统动力学的角度出发，建立了基于钻柱、岩石相互作用下的牙轮钻头动力学模型。
On the system dynamics, the dynamics model for roller cone bit under the interaction of drilling string and rock was established.
从系统动力学的角度出发，建立了基于钻柱、岩石相互作用下的牙轮钻头动力学模型。
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