The methods of parameters identification are analyzed and low-order equivalent system is identified by frequency domain maximum likelihood method and least square method.
分析了等效系统参数辨识方法，采用最小二乘法与频域极大似然法求解先进飞机的低阶等效系统。
According to the features of equivalent enthalpy-drop method applied to thermodynamic system, the methods of local quantitative calculation for cycle function method in regenerative system is deduced.
根据等效焓降法在热力系统计算时的特点，推导了循环函数法在回热系统中的局部定量计算方法，导出了回热系统局部定量计算的几个重要结论。
From theory of root locus derived are the criteria of universal interest for stability of nonlinear system on the basis of equivalent gain, and methods for its qualitative and quantitive analyses.
本文用等效增益概念，根据根轨逊理论，导出了具有普遍意义的非线性系统稳定性的判别准则以及定性定量分析稳定性的方法。
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