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。

youdao

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。

youdao

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。

youdao