摘要
时滞是典型的非线性环节,通常存在于流体动力学中例如航空飞行器控制。一个新型的改进史密斯预估器的控制方案被提出,可以解决扰动影响下的积分时滞系统控制中出现的稳态误差问题。首先积分时滞过程被预测为一阶时滞模型。通过使用劳思赫尔维斯稳定判据设计的PID控制策略可以实现系统稳定。该设计方法可以成功消除扰动的影响。但是在跟踪控制的瞬态响应中会产生较大的超调量。因此模糊逻辑方法被用于调节设计的PID控制器,以降低超调量。最终研究设计的控制方法具有很好的鲁棒性同时在应对系统不确定性时表现了很好的控制性能。
As is known,time delay（ alternatively named dead time） is a typical nonlinear action and always exists in fluid dynamics such as areospace vehicle control. In this paper,a novel improved Smith predictor control scheme is put forward,which can solve the offset problems caused by the time delay and disturbance in the control Integral Plus Dead Time（ IPDT） process control. At first,IPDT process is predict for the First Order Plus Dead Time（ FOPDT） transfer function.By using Routh-Hurwitz Stability Criterion,PID related control scheme is then designed to attain system stability. In this developed IPDT-FOPDT based Smith Predictor control sheme,loading disturbance could be eliminated successfully. However,a big overshoot is appeared during the tracking control of transient response. Thus fuzzy logic method is applied for setpoint weight tuning of the designed PID controller. As a result,the overshoot is dramatically reduced. Eventually a good robustness and performance for the controlling nonlinear IPDT process with uncertainties are presented.
出处
《空间电子技术》
2016年第4期35-40,46,共7页
Space Electronic Technology
基金
西南民族大学基金项目(编号:2014NZYQN08)
关键词
非线性系统
模糊逻辑
稳定性分析
时滞
Nonlinear process control
Fuzzy logic
Stability analysis
Time delay
