变风量空调系统末端的变论域模糊PID控制

针对目前传统PID控制对模型依赖性强,参数难以在线调整,对不确定性强的变风量(VAV)空调系统的控制快速性和准确性差的特点,提出一种变论域模糊PID控制,以提高系统的控制速度和精度,使系统具有良好的动、静态性能。在推导的变风量空调房间和末端装置数学模型的基础上进行了仿真研究。结果表明,控制系统具有很好的鲁棒性和自适应能力,可以明显提高系统的响应速率,控制器的动态结构更适用于变风量空调系统。     

飞航导弹变论域自适应模糊PID控制方法

对于导弹飞行控制,当系统在大动态范围运行时,常规模糊PID控制由于固定论域、调整因子以及根据个别专家经验制定的有限控制规则不够完善,其固定的论域范围就会使得模糊控制对PID参数的调整过大或者过小,造成系统响应变慢,出现震荡,难以稳定等。针对导弹在飞行过程中具有非线性、耦合性以及时变性等特点,设计了一种自适应变论域模糊PID复合控制策略,采用变论域模糊控制实现控制参数自整定和控制规则的自调整,采用PID控制弥补模糊控制固有的精度盲区。实验结果表明该方法无论在随机扰动还是幅值扰动情况下都能够实现快速响应,自适应抗干扰能力强,具有动态响应快、稳定精度高,鲁棒性强等特点。     

模糊PID控制在中央空调系统中的应用研究

将模糊控制和普通PID控制相结合,提出了一种基于模糊控制规则的模糊PID控制器的设计方法并将其应用于中央空调系统的控制。实验表明,这种方法比普通的PID控制方法精度高、超调量减少,具有较强的鲁棒性。     

基于变论域模糊PID算法的MOCVD温升控制

将变论域思想加入到常规模糊控制中,实现了对MOCVD系统温升过程的有效控制.该控制器包含两个模糊控制过程,一个实现对输入输出论域的自调整,一个实现对温升的控制,通过实验仿真表明,所采用的控制方案能提高温升过程控制的整体性能.     

基于免疫遗传算法与变论域模糊PID的船舶航向控制研究

针对船舶航向控制的非线性、大时滞等特点,提出一种融合免疫遗传算法与变论域模糊PID控制算法的船舶航向控制方案.建立变论域模糊控制器,通过引入论域伸缩因子提高自适应性,根据船舶航行状况实时调整PID控制参数.采用免疫遗传算法的抗体多样性、免疫记忆等特性改进算法寻优性能,进一步提高收敛效率、优化控制参数.最后,通过构建PI...     

模糊内模PID控制及应用

工业控制系统经常存在时滞现象,且含有一定程度的非线性环节,采用常规控制方法很难满足控制要求.内模控制对时滞系统具有较好的控制作用.当内模与系统实际模型相差较大时,控制效果将会下降.根据影响系统参数的主要因素,预先确定在不同条件下系统的传递函数.当系统运行时,借助模糊控制理论,直接调用相应的系统参数,并采用内模PID进行控制.实际应用表明,该方法具有很好的控制效果.     

参数在线调整的模糊自适应PID控制研究

PID是工程中最为广泛应用的控制器技术,因其需要在实际使用中多次凑试来确定参数,这个过程非常耗时。而且凑试出来的参数往往固定,虽然能够使被控系统最终达到控制要求,但收敛过程较慢。模糊PID的提出部分地解决了这些问题,通过偏差量来选择模糊规则表里的不同数值,达到了动态地调整PID参数的效果,使被控系统能够快速收敛。然而,模糊PID依然存在改进的空间,通过对模糊PID的输入论域和输出论域分别引入指数型函数作为伸缩因子的方法,使模糊PID的参数达到了在线调整的效果,实现了模糊自适应PID。通过仿真应用的比较结果,证实了提出的参数在线调整的模糊自适应PID控制方法,相较于普通的模糊PID具有更优的动态特性。     

时滞系统的模糊自适应PID控制研究

将模糊控制和常规PID控制相结合,设计了一种模糊自适应PID控制器,该控制器根据偏差和偏差变化率的要求实时调整PID参数。通过仿真表明：该控制器既具有常规PID控制器高精度的优点,又具有模糊控制器快速、适应性强的特点,并可以迅速消除系统误差,保证了系统具有良好的动、静态特性。     

自适应模糊PID控制在AUV控制中的应用

自治潜水器(AUV,Autonomous Underwater Vehicle)是非线性、强耦合、大惯性的多输入多输出系统,又由于受到海流、传感器、执行机构等不确定性的影响,对AUV控制器的鲁棒性能提出了更高的要求.本文针对我国正在研制开发的长航程自治潜水器的特性及其对航行控制的要求,将PID控制与模糊控制的简便性、灵活性以及鲁棒性结合起来,为AUV设计了可在线修改PID参数的自适应模糊PID控制器,仿真结果证明了该种控制方法不但提高了AUV系统的动态特性,而且可在参数摄动和外界扰动时获得较好的控制性能.     

Predictive functional control based on fuzzy T-S model for HVAC systems temperature control

In heating, ventilating and air-conditioning (HVAC) systems, there exist severe nonlinearity, time-varying nature, disturbances and uncertainties. A new predictive functional control based on Takagi-Sugeno (T-S) fuzzy model was proposed to control HVAC systems. The T-S fuzzy model of stabilized controlled process was obtained using the least squares method, then on the basis of global linear predictive model from T-S fuzzy model, the process was controlled by the predictive functional controller. Especially the feedback regulation part was developed to compensate uncertainties of fuzzy predictive model. Finally simulation test results in HVAC systems control applications showed that the proposed fuzzy model predictive functional control improves tracking effect and robustness. Compared with the conventional PID controller, this control strategy has the advantages of less overshoot and shorter setting time, etc.     

Predictive functional control based on fuzzy T-S model for HVAC systems temperature control

In heating, ventilating and air-conditioning （HVAC） systems, there exist severe nonlinearity, time-varying nature, disturbances and uncertainties. A new predictive functional control based on Takagi-Sugeno （T-S） fuzzy model was proposed to control HVAC systems. The T-S fuzzy model of stabilized controlled process was obtained using the least squares method, then on the basis of global linear predictive model from T-S fuzzy model, the process was controlled by the predictive functional controller. Especially the feedback regulation part was developed to compensate uncertainties of fuzzy predictive model. Finally simulation test results in HVAC systems control applications showed that the proposed fuzzy model predictive functional control improves tracking effect and robustness. Compared with the conventional PID controller, this control strategy has the advantages of less overshoot and shorter setting time, etc.     

基于导管机器人的变论域模糊PID控制研究

在微创血管介入手术中,当操作者通过主手给出期望位置后,要求导管机器人能够控制导管快速稳定并精确到达目标位置。但由于导管机器人的电机响应迟滞以及血管内的复杂环境因素,传统的模糊PID控制已经不能满足血管介入手术对导管机器人快速性、精确性、强鲁棒性的要求。通过对导管建模,导管机器人运动学、手术坐标空间变换分析,采用变论域模糊PID控制,并运用Matlab进行仿真。仿真结果证明,所设计的变论域模糊PID控制器能够提高导管机器人的响应速度、定位精度与稳定性,为血管介入手术导管机器人的控制提供良好的理论依据。     

A fuzzy PID controller for nonlinear and uncertain systems

 In order to control systems that contain nonlinearities or uncertainties, control strategies must deal with the effects of these. Since most control methods based on mathematical models have been mainly focused on stability robustness against nonlinearities or uncertainties, they are limited in their ability to improve the transient responses. In this paper, a nonlinear fuzzy PID control method is suggested, which can stably improve the transient responses of systems disturbed by nonlinearities or unknown mathematical characteristics. Although the derivation of the control law is based on the design procedure for general fuzzy logic controllers, the resultant control algorithm has analytical form with time varying PID gains rather than linguistic form. This means the implementation of the proposed method can be easily and effectively applied to real-time control situations. Control simulations are carried out to evaluate the transient performance of the suggested method through example systems, by comparing its responses with those of the nonlinear fuzzy PI control method developed in [9].     

基于灰色预测模糊PID算法的空调房间温度控制

针对中央空调系统房间温度控制系统的大惯性、纯滞后和时变性特点,设计了将等维新息灰色预测控制与模糊自整定PID相结合的新型控制器,建立中央空调房间温度控制系统的数学模型,介绍灰色预测模糊PID控制器结构,并对该控制方案进行了数字仿真。仿真结果表明,该控制器比PID控制器、模糊PID控制器有更多优越性,调节迅速,超调小,有更好的动、静态性能,具有一定的可行性。     

The application of fuzzy control systems to industrial processes

The paper describes the application of fuzzy algorithms to the control of dynamic processes. The fuzzy control algorithm is used to implement linguistically expressed heuristic control policies directly, with a view to automating those complex and poorly-defined processes where modelling difficulties and lack of suitable measurements make manual control imperative. The results obtained from two pilot-scale studies are presented and the stability of the fuzzy control system is discussed.     

Comfort-based fuzzy control optimization for energy conservation in HVAC systems

The work presented herein illustrates the use of computational intelligence and optimization approaches for improving the fuzzy controller׳s performance in architectural heating, ventilation, and air conditioning system (HVAC). The primary purpose of the performed research is to find a method to moderate the energy use without compromising the comforts of the inhabitants. The control design used to meet this purpose includes the predicted mean vote (PMV) and predicted percentage dissatisfied (PPD) indices. The software of choice for evaluating PMV and PPD is EnergyPlus. Whereas, for the fuzzy controller and the evolutionary optimization framework, the co-simulation tool with building controls virtual test bed (BCVTB) is used in conjunction with Simulink. The ensuing comparison between EnergyPlus׳s thermal control of HVAC and our fuzzy approach is the outcome of the present research.     

自主汽车的侧向H∞自适应变论域模糊控制

自主侧向控制实现汽车自动调节转向和车道变换,是复杂的非线性控制系统.本文将变论域模糊控制,自适应技术和H_∞最优控制理论相结合对自主汽车的侧向系统进行控制,提高了系统的鲁棒性和控制精度.设计直接自适应变论域模糊控制器,利用Lyapunov稳定性理论证明了整个闭环系统的稳定性.然后与H_∞相结合,通过选取控制变量的权重因子,可以将逼近误差和外部扰动对跟踪误差的影响减小到任意给定的标准.最后把这种算法应用到了自主汽车的侧向系统的控制,仿真结果表明算法的实用性和有效性.     

气动位置伺服系统的非对称模糊PID控制

对于有杆气缸的非对称物理及摩擦力特性,提出了采用非对称模糊策略的模糊PID控制算法,较好地解决了有杆气缸由于左右两腔物理结构和摩擦力特性的不对称而造成运动过程中压力变化复杂的问题,改善了系统的动态响应性能.实验证明,采用非对称模糊策略的模糊PID控制可以明显地提高气动位置伺服系统的动态响应性能,系统具有较小的超调量和过渡过程时间,并获得了满意的重复稳态精度.     

PCR温度模糊PID控制器的设计及仿真

根据PCR对温度控制的要求设计出一种模糊PID控制器,采用误差和误差变化率作为模糊PID控制器的输入,PID参数作为模糊PID控制器的输出,并使用一组模糊规则实现对PID参数的在线优化调节.通过使用Simulink图形化工具平台对模糊PID控制器和传统的PID控制器进行建模和仿真.结果表明,与传统PID控制器相比,模糊PID控制器性能优良,使系统响应速度加快,超调减小.