The numerical solution of the governing equations, pertaining to one-dimensional unsteady gas dynamics, utilizes an implicit finite-difference scheme combined with the method of characteristics.
控制方程是一维非定常气体动力学偏微分方程组，用隐式中心差分结合特征线法解算。
To investigate the torsional vibration of the system, the dynamics governing equations of the system is established using the Lagrange equation and the assumed mode method.
为了研究此系统的扭转振动，运用拉格朗日方程和假设模态法建立了系统的动力学方程。
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