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。

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By the numerical simulation of classical models, the high accuracy of this method is verified, and the efficiency of the method is remarkable compared with other numerical algorithms.

通过对经典孔缝电磁耦合模型的数值仿真，验证了该算法具有较高的准确性和计算效率。

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By the numerical simulation of classical models, the high accuracy of this method is verified, and the efficiency of the method is remarkable compared with other numerical algorithms.

通过对经典孔缝电磁耦合模型的数值仿真，验证了该算法具有较高的准确性和计算效率。

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