Mining the fuzzy control rules of aeration in a Submerged Biofilm Wastewater Treatment Process

This paper presents a special rule base extraction analysis for optimal design of an integrated neural-fuzzy process controller using an “impact assessment approach.” It sheds light on how to avoid some unreasonable fuzzy control rules by screening inappropriate fuzzy operators and reducing over fitting issues simultaneously when tuning parameter values for these prescribed fuzzy control rules. To mitigate the design efforts, the self-learning ability embedded in the neural networks model was emphasized for improving the rule extraction performance. An aeration unit in an Aerated Submerged Biofilm Wastewater Treatment Process (ASBWTP) was picked up to support the derivation of a solid fuzzy control rule base. Four different fuzzy operators were compared against one other in terms of their actual performance of automated knowledge acquisition in the system based on a partial or full rule base prescribed. Research findings suggest that using bounded difference fuzzy operator (O_b) in connection with back propagation neural networks (BPN) algorithm would be the best choice to build up this feedforward fuzzy controller design.     

基于Elman神经网络的浓相输送模糊控制系统

由于粉末物料的浓相输送系统存在严重的非线性和时变性,故要想建立其准确数学模型难度非常大,本文提出了使用模糊神经网络控制系统,并对于模糊控制规则由Elman神经网络联想记忆后提取,它不但可以获得最佳控制规则,而且响应速度快并能够进行在线进行规则的修正。经仿真实验,该控制器能够对粉末物料流量在一定范围内进行协调优化时实控制。     

复杂工业过程的遗传模糊神经网络控制

本文提出一种基于遗传算法和监督学习方法的有效模糊神经网络控制，这种控制器采用并行处理的推理网络，具有两个重要特点：自适应和学习性，所提方法经过仿真和温控验证表明控制性能良好。     

Fuzzy neural networks for estimation and fuzzy controller design: simulation study for a pulp batch digester

A structural implementation of a fuzzy inference system through connectionist network based on MLP with logical neurons connected through binary and numerical weights is considered. The resulting fuzzy neural network is trained using classical backpropagation to learn the rules of inference of a fuzzy system, by adjustment of the numerical weights. For controller design, training is carried out off line in a closed loop simulation. Rules for the fuzzy logic controller are extracted from the network by interpreting the consequence weights as measure of confidence of the underlying rule. The framework is used in a simulation study for estimation and control of a pulp batch digester. The controlled variable, the Kappa number, a measure of lignin content in the pulp, which is not measurable is estimated through temperature and liquor concentration using the fuzzy neural network. On the other hand a fuzzy neural network is trained to control the Kappa number and rules are extracted from the trained network to construct a fuzzy logic controller.     

污水处理过程中对泥龄的模糊神经网络控制

针对污水处理过程的高度非线性、进水流量及水质变化剧烈、各状态变量之间存在强耦合关系等特性，提出了一种自适应模糊神经网络控制方法，以泥龄作为运转控制参数，调节排出的污泥量．仿真结果表明该控制器能够在线调整输入变量的隶属函数、优化控制规则，将其应用于活性污泥法污水处理系统中，可以快速地去除污水中的污染物，使污泥具有良好的去污能力和沉淀性能，并且具有很强的鲁棒性．     

基于DSP的防空火箭炮模糊神经网络位置控制器设计

针对多管火箭炮发射时恶劣的负载特性,设计了一种模糊神经网络自适应位置控制器.用梯度下降法实时修正模糊控制器的输入输出隶属度参数,以使模糊神经网络能根据火箭炮跟踪发射过程中的负载特性实时调整速度给定值,从而减小系统参数变化和外部干扰对火箭炮性能的影响.采用对空间分区建立索引表的方法,建立了一种基于TMS320F2812的新型模糊神经网络位置控制器的编程实现方法.仿真及实验结果表明该方法可有效提高火箭炮位置伺服系统的动态响应性能、稳定性和鲁棒性.     

Neural and Neurofuzzy FELA Adaptive Robot Control Using Feedforward and Counterpropagation Networks

In this paper, the application of neural networks and neurofuzzy systems to the control of robotic manipulators is examined. Two main control structures are presented in a comparative manner. The first is a Counter Propagation Network-based Fuzzy Controller (CPN-FC) which is able to self-organize and correct on-line its rule base. The self-tuning capability of the fuzzy logic controller is attained by taking advantage of the structural equivalence between the fuzzy logic controller and a counterpropagation network. The second control structure is a more familiar neural adaptive controller based on a feedforward (MLP) network. The neural controller learns the inverse dynamics of the robot joints, and gradually eliminates the model uncertainties and disturbances. Both schemes cooperate with the computed torque control algorithm, and in that way the reduction of their complexity is achieved. The ability of adaptive fuzzy systems to compete with neural networks in difficult control problems is demonstrated. A sufficient set of numerical results is included.     

遗传优化的径向基函数船舶模糊控制器

研究径向基函数模糊神经网络在船舶控制器设计中的应用 ,设计了一个新型的径向基函数模糊神经网络控制器用以适应船舶在时变和不确定环境下的控制性能要求 .控制器设计的主导思想是在传统的径向基函数神经网络中增加一个模糊隐层 ,并采用遗传算法对控制器参数进行优化 .与传统方法相比 ,控制器模糊规则库的设计过程所需的先验知识更少 .最后采用Matlab 6 .1的Simulink工具以船舶运动模型为对象进行了船舶控制的仿真试验 ,结果证明了其有效性     

模糊神经网络pH控制器的DSP实现

针对pH值控制过程具有较强非线性、纯滞后性的特点，传统PID控制往往达不到满意控制效果。介绍一种将模糊控制技术与神经网络技术相结合构成的模糊神经网络pH控制器，通过数字仿真显示了该控制算法的控制效果优于传统的PID控制和一般的模糊控制算法。并将提出的模糊神经网络控制算法在DSP上进行了实现．通过模拟实验验证了该控制器的可行性。     

Intelligent process control using neural fuzzy techniques

In this paper, we combine the advantages of fuzzy logic and neural network techniques to develop an intelligent control system for processes having complex, unknown and uncertain dynamics. In the proposed scheme, a neural fuzzy controller (NFC), which is constructed by an equivalent four-layer connectionist network, is adopted as the process feedback controller. With a derived learning algorithm, the NFC is able to learn to control a process adaptively by updating the fuzzy rules and the membership functions. To identify the input–output dynamic behavior of an unknown plant and therefore give a reference signal to the NFC, a shape-tunable neural network with an error back-propagation algorithm is implemented. As a case study, we implemented the proposed algorithm to the direct adaptive control of an open-loop unstable nonlinear CSTR. Some important issues were studied extensively. Simulation comparison with a conventional static fuzzy controller was also performed. Extensive simulation results show that the proposed scheme appears to be a promising approach to the intelligent control of complex and unknown plants, which is directly operational and does not require any a priori system information.     

基于模糊神经网络的统一潮流控制器

为了减少先验知识对统一潮流控制器中模糊规则的设计和电力系统参数的变化对统一潮流控制器性能的影响,文中采用模糊神经网络来设计统一潮流控制器.为此首先简单介绍了统一潮流控制器的控制策略,然后阐述了自组织模糊神经网络和基于遗传算法的模糊神经网络的构造方法,接着将自组织模糊神经网络、基于遗传算法的模糊神经网络结合统一潮流控制器的控制策略应用于两种统一潮流控制器.最后通过MATLAB仿真例子来验证:这两种统一潮流控制器的设计方法的有效性.     

遗传模糊神经网络在航空发动机控制中的应用

模糊神经网络控制器是一种将模糊逻辑与神经网络相结合的智能控制器,其既不依赖于被控对象精确的数学模型,又能根据被控对象参数和环境的变化自适应地调节控制规则和隶属函数参数,但是存在着收敛速度慢,较多局部极小的情况下很容易陷入局部极小值等缺点。针对存在的问题,提出一种模糊神经网络控制器的优化方法。隶属度函数的参数具有全局性,用遗传算法来优化;神经网络的权值代表模糊系统的控制规则,它用神经网络的误差反传算法(BP)来调整。将算法用于航空发动机控制,实现对低压转子转速的无静差控制,与应用BP算法的模糊神经控制相比,控制性能改善较大,结果令人满意。     

基于自组织模糊神经网络电力系统稳定器的设计

采用一种自组织模糊神经网络设计电力系统稳定器,该稳定器能通过结构和参数的学习,克服传统模糊控制器设计过程吕存在的盲目性及拚养伤性,避免模糊控制器中模糊逻辑规则的冗余成欠缺。仿夫表明该电力系统稳定器具有良好控制性能。     

采掘机器人的模糊监督——神经网络控制器技术

介绍一种基于规则的自学习神经网络控制器在采掘机器人上的应用。它根据实时执行的结果，采用多步学习－模糊监督学习方法，修正神经网络的教师信号，使控制算法简化，提高了计算的实时性，加快了学习速度实验验证了采用该方法取得的一些结果。     

A novel design of high-sensitive fuzzy PID controller

A hybrid model is designed by combining the genetic algorithm (GA), radial basis function neural network (RBF-NN) and Sugeno fuzzy logic to determine the optimal parameters of a proportional-integral-derivative (PID) controller. Our approach used the rule base of the Sugeno fuzzy system and fuzzy PID controller of the automatic voltage regulator (AVR) to improve the system sensitive response. The rule base is developed by proposing a feature extraction for genetic neural fuzzy PID controller through integrating the GA with radial basis function neural network. The GNFPID controller is found to possess excellent features of easy implementation, stable convergence characteristic, good computational efficiency and high-quality solution. Our simulation provides high sensitive response (∼0.005 s) of an AVR system compared to the real-code genetic algorithm (RGA), a linear-quadratic regulator (LQR) method and GA. We assert that GNFPID is highly efficient and robust in improving the sensitive response of an AVR system.     

Knowledge-based unmanned automation and control systems for the SBR wastewater treatment process

Wastewater treatment processes are usually located in rural seclusion. we designed an unmanned and automated control system for a sequencing batch reactor (SBR) wastewater treatment pilot plant. The pilot plant was constructed in the countryside, a small distance from a large city. Networks and wireless modules were employed for data transmission. A local controller was installed in the SBR pilot plant as a client, and a monitoring system was located in another place as a server. The communication system consisted of an asymmetric digital subscriber line (ADSL) network and a code division multiple access (CDMA) module. A remote control and monitoring system were constructed in a laboratory in the city. We describe a fuzzy inference system which was constructed with the operator's assistance, and acquired sensor data to determine the threshold and influent. This work was presented in part at the 7th International Symposium on Artificial Life and Robotics, Oita, Japan, January 16–18, 2002     

基于自适应模糊神经网络控制器的网络控制系统

网络控制系统中存在着时延、丢包、网络干扰等问题。针对网络控制系统中存在恶化系统的控制性能,甚至导致系统不稳定的因素,提出了一种基于自适应模糊神经网络控制器的网络控制系统,它能根据系统的实际输出与期望输出误差,利用自适应模糊控制和神经网络自学习的原理进行控制参数的自行调整,以符合控制系统的实际要求,同时,分析了网络延时,丢包率及网络干扰因素对系统性能的影响。利用TrueTime工具箱建立了包含自适应模糊神经网络控制器的网络控制系统的仿真模型,并将其分别与基于常规PID控制器的网络控制系统和基于模糊参数PID控制器的网络控制系统进行了比较。实验结果表明,在相同的网络环境下,基于自适应模糊神经网络控制器的网络控制系统的控制效果比基于常规的PID控制器和基于模糊参数PID控制器的要好,且具有较好的抗干扰能力和鲁棒性能。     

基于HGA的模糊神经控制器设计及其应用

将神经网络与模糊控制相结合,实现了模糊控制器的自学习和自适应。给出一种基于递阶遗传算法的模糊神经网络优化算法,通过对每个染色体采用递阶编码,可以同时优化模糊神经网络结构和权值参数。将这种模糊神经网络控制器应用于镍氢电池的充电控制中,证明了算法的有效性。     

基于模糊神经网络PID控制器的EEC数字化设计

为实现航空发动机模拟式电子控制器(EEC)的数字化设计,以其低压压气机导流叶片调节通道为主要研究对象,提出一种模糊神经网络PID控制器,将模糊控制、神经网络、PID控制相结合,利用模糊控制专家经验优势和神经网络的自学习、自适应能力,优化PID控制参数,实现控制性能提升。仿真结果显示,基于模糊神经网络的PID控制器控制性能有较大提高,具有比常规神经网络PID控制器更小的超调量和更好的抗干扰性;适用于定常系统和非定常系统,具有更好的自适应性与鲁棒性;可应用于航空发动机模拟式电子控制器(EEC)的数字化设计。     

基于增强型算法并能自动生成规则的模糊神经网络控制器

给出了一种基于增强型算法并能自动生成控制规则的模糊神经网络控制器RBFNNC（reinforcements based fuzzy neural network comtroller）。该控制器能根据被控对象的状态通过增强型学习自动生成模糊控制规则,RBFNNC用于倒立摆小车平衡系统控制的仿真实验表明了该系统的结构及增强型学习算法是有效和成功的。