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频率法是工程技术界的工程技术人员、科研工作者以及大专院校师生进行系统分析、综合、测定和设计的重要分析方法,应用极广。然而,要得到一个系统频率特性的图解却需要经过繁琐的计算过程,对于高阶系统,这种计算的复杂程度甚至是难以想象的。但是,电子数字计算机的问世,特别是中小型和微型数字计算机的普及使用,为这种繁琐计算的自动化提供了得心应手的工具。本文从工程应用的角度介绍了线性系统频率特性的三种数字计算方法。特别是第三种方法,它能一次计算出开环和闭环频率特性;而且,最重要的是,在任意点上,不需要进行数值因式分解,是一种简单易行的新颖算法,具有许多优点,对从事系统分析和理论计算的同志很有参考价值。文后附有能自动输出解答清单和自动作出幅频、相频特性图解的 FORTRAN 程序和 BASIC 程序,在工程应用上也很有实用价值。译者曾将这个 BASIC 程序作了必要修改,在国产 DJS—130上调试计算,获得了满意的结果,证明这种方法确实是一种先进的方法。
Frequency method is engineering and technical personnel in engineering and technology, scientific research workers and teachers and students in tertiary institutions to carry out systematic analysis, synthesis, measurement and design of important analytical methods, a very wide range of applications. However, obtaining a graphical representation of the frequency characteristics of the system requires tedious calculations that are even more difficult to imagine with higher order systems. However, the advent of electronic digital computers, especially the widespread use of small and medium-sized and miniature digital computers, provides a handy tool for the automation of such tedious calculations. This paper introduces three kinds of numerical calculation methods of linear system frequency characteristics from the perspective of engineering application. In particular, the third method, which calculates the open-loop and closed-loop frequency characteristics at once, and, most importantly, does not require numerical factorization at any point, is a simple and straightforward new algorithm with Many advantages, for engaging in system analysis and theoretical comrades of great reference value. The text attached to the FORTRAN program and BASIC program can automatically output the list of answers and automatic amplitude and phase frequency characteristics diagram is also very useful in engineering applications. The translator once made necessary modifications to this BASIC program, commissioned the calculation on the domestic DJS-130 and obtained satisfactory results, proving that this method is really an advanced method.