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本文提出了一种时域和频域测辨相结合的线性定常系统测辨新方法。当高阶系统传递函数已知时,它就是具有多可调参数的Pade逼近。此法由测辨高阶系统前n阶时间矩和测辨描述系统主要动态性能的一些典型频率响应数据,确定动态系统“类等效”简化模型的参数。此外,“外推函数”的使用有效地提高了时矩测辨的精度。实例表明,本方法简易、精确和灵活,适于工程建模,便于工程设计。
In this paper, a new method of linear stationary system identification combining time domain and frequency domain detection is proposed. When the higher order system transfer function is known, it is a Pade approximation with multi-adjustable parameters. This method determines the parameters of a “class equivalent” simplified model of a dynamical system by identifying the first n order moments of a higher order system and by identifying some typical frequency response data describing the main dynamic performance of the system. In addition, the use of the “extrapolation function” effectively improves the accuracy of the moment measurement. The example shows that this method is simple, accurate and flexible, suitable for engineering modeling and easy for engineering design.