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在用古典控制理论中的频率响应法进行电液伺服阀或伺服系统的动态分析时,经常需要绘制对数频率特性。传统的方法是找出转折频率,绘制对数幅频特性的渐近线再加以修正,绘制各个环节的相频特性曲线再进行迭加。由这样得出开环对数频率特性,再利用尼柯尔斯算图,才能求出闭环频率特性。这种方法很烦琐,精度低,工作量大。我们在进行电液伺服阀的分析与设计时,比较多地使用了Sharp EL-5002型袖珍计算器。这种计算器有六个数据存储器和一个寄存器,能进行代数运算、函数运算、统计运算、还能按预先编好的程序进行重复运算。国产DS-5(大连产)或广州8031型计算器的功能与Sharp 5002完全相同。下面介绍用计算器计算频率特性的方法。
In the classical control theory of the frequency response method for electro-hydraulic servo valve or servo system dynamic analysis, often need to draw logarithmic frequency characteristics. The traditional method is to find out the transition frequency, draw the asymptotic line of the logarithmic amplitude-frequency characteristic and then correct it, and then draw the phase-frequency characteristic curve of each link and then add it. From this open-loop logarithmic frequency characteristics, and then use the Nichols diagram, to find the closed-loop frequency characteristics. This method is cumbersome, low accuracy, heavy workload. When we carry out the analysis and design of electro-hydraulic servo valve, more use of the Sharp EL-5002 pocket calculator. This calculator has six data memory and a register, can carry out algebraic operations, function operations, statistical operations, but also pre-programmed procedures for repeated operations. Domestic DS-5 (Dalian) or Guangzhou 8031 calculator and Sharp 5002 exactly the same function. The following describes how to use the calculator to calculate the frequency characteristics.