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描述函数法是分析非线性系统的最常用的方法之一。因为应用这种方法时,非线性系统的阶数不受限制,所以在分析非线系统的方法中,描述函数法占有极其重要的地位。由于描述函数法是分析非线性控制系统的一种近似方法,它是线性系统理论中的频率法,在一定假设条件下,在非线性系统中应用,所以,以前文献上所介绍的用描述函数法分析非线性系统的手段,都是建立在频率法基础上的,如利用奈魁斯特图、尼柯尔斯图及伯德图进行分
Describing function methods is one of the most commonly used methods for analyzing nonlinear systems. Because of the unrestricted order of non-linear systems when applying this method, describing function methods plays a very important role in the analysis of nonlinear systems. Since descriptive function method is an approximate method for analyzing nonlinear control systems, it is a frequency method in linear system theory and is applied to nonlinear systems under certain assumptions. Therefore, the description function The method of analyzing non-linear systems is based on the frequency method, such as the use of Niquist Diagram, Nicols Stuttgart and Byrd chart