Through instrumental variable identification method, the single input single output difference equations and the Z transfer function were gotten.

采用辅助变量辨识方法辨识得到单输入单输出差分方程和Z传递函数。

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Using method of variable difference, random error was parted from general error.

对测量误差中随机误差采用了变量差分法进行了分离。

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Euler equations of generalized Riemann variable are derived from unsteady primitive variable Euler equations and solved by using two - a point-two-step upwind finite difference method.

该方法将原参数非定常欧拉方程组重新组合成以广义黎曼变量表示的欧拉方程组，再用二点二步迎风格式离散求解。

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