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振荡是控制回路中存在的普遍现象,而调节阀的迟滞是造成控制系统振荡的重要原因。诸如迟滞等非线性因素的存在,大大限制了控制回路的性能。所以迟滞检测对查找控制回路振荡的原因,提高控制回路的准确性、稳定性具有着重要意义,无论在技术应用还是经济效益方面都是大有裨益的。把研究的重点集中于对迟滞产生机理的理解和此时调节阀的具体变化,并注重检测方法在实际工业应用中的可行性。借鉴成熟的波形拟合检测体系,结合大量的事例,提出一种基于控制器输出波形分割拟合分析的迟滞检测方法。在连续系统取得良好的检测效果之后,将其推广到离散的实际工业应用中,仿真表明了该方法在不同系统中的有效性。
Oscillation is a common phenomenon in the control loop, and the hysteresis of the control valve is an important reason for the oscillation of the control system. The existence of nonlinear factors such as hysteresis greatly limits the performance of the control loop. Therefore, hysteresis detection to find the reasons for the control loop oscillation, control loop to improve the accuracy and stability of great significance, both in technical application and economic benefits are of great benefit. The research focuses on the understanding of the mechanism of hysteresis and the specific changes of the control valve at this time, and pay attention to the feasibility of the detection method in practical industrial applications. With reference to the mature waveform fitting detection system and a large number of examples, a hysteresis detection method based on controller output waveform fitting analysis is proposed. After the continuous system obtains the good detection effect, it is extended to the discrete practical industrial applications. The simulation shows the effectiveness of this method in different systems.