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频域分析法是控制系统设计、分析和参数调整最经典的方法之一。理论上,对象或系统频域特性是通过以正弦波或余弦波频率信号为激励信号的频率响应实验获得。由于实际生产过程条件所限,经典的频率响应实验法难以实施,致使过程控制系统频率特性难以发挥其理论指导工业实践的优势。在计算机技术高度发展的今天,传统的频率响应以及系统或对象频率特性获取的方法得到了根本性的突破。该文提出了一种采用数字无源LCR振荡器从时域过程响应数据提取对象或系统的频率特性的方法,该方法为过程控制系统频率特性分析提供了一种较为简便和有效手段。仿真实验和实际应用结果表明了该方法的正确性和有效性。
Frequency domain analysis is one of the most classic methods of control system design, analysis and parameter tuning. In theory, the frequency domain characteristics of an object or system are obtained by experimenting with the frequency response of a sine wave or cosine wave frequency signal as an excitation signal. Because of the actual production process conditions, the classical frequency response experiment method is difficult to implement, resulting in the process control system frequency characteristics difficult to play its theory to guide the advantages of industrial practice. In today’s highly developed computer technology, a fundamental breakthrough has been made in the traditional methods of frequency response and system or object frequency characteristics acquisition. This paper presents a method of using digital passive LCR oscillator to extract the frequency characteristics of object or system from time-domain process response data. This method provides a simple and effective method for analyzing the frequency characteristics of process control system. Simulation results and practical application show that the method is correct and effective.