基于神经网络Smith预估器的预测控制

针对非线性系统时滞问题,给出了一种新型的单神经元Smith预测控制算法.神经网络的预测控制器由不完全微分的单神经元自适应PID控制器和神经网络的Smith预估器组成.预估器对输出进行多步预测,控制器超前动作以消除时滞对系统的影响.不完全微分的单神经元自适应PID控制器通过改进的Hebb学习规则实现其权值调节,通过权系数的在线调整实现自适应控制.仿真实验证明了该方法具有较快的响应速度和较好的响应性能.     

一类基于Smith预估器的神经元控制器的实现研究

本文提出一种基于Smith预估器的神经元控制器的实现方法,该神经元控制器的控制算法是不完全微分先行PID控制.利用MATLAB仿真软件对该控制器在电加热炉中的应用进行仿真研究.仿真结果表明,该控制器具有Smith预估控制和神经元控制的优点.     

基于PID神经网络的电加热炉Smith预估温度控制

本文提出了基于PID神经网络和Smith预估器的电热炉温度控制器。PID神经网络将PID控制器与具有自学习功能的神经网络相结合,综合了PID和神经网络控制各自的优点,改善参数时变对系统性能的影响。PIDNN-Smith控制器加入Smith预估器解决了加热炉的滞后影响,使控制器对加热炉的温度控制有了更好的效果。利用MATLAB软件对温控系统进行了仿真测试,并对测试结果进行了分析。     

一种基于DTFEL的非线性自适应逆控制

提出一种基于离散时间反馈误差学习(DTFEL)的两自由度非线性自适应逆控制(AIC)方法,其控制器由动态RBF神经网络(DRBFNN)前馈控制器和参数固定的PD反馈控制器构成.PD控制器用来保证闭环系统稳定,动态RBF神经网络以PD控制器输出和反馈误差的线性组合为学习信号,通过一种改进的NLMS(VS MNLMS)算法在线学习和逼近对象的动态逆,提高反馈控制器的性能.稳定性分析证明了该AIC系统稳定.数字仿真结果表明,该AIC具有良好的自适应能力和鲁棒性,是一种有效的非线性控制方法.     

强非线性系统的一种快速神经网络控制策略

采用传统的神经网络逆模策略控制具有强非线性的系统,因其计算量过大导致在线实时性能不佳.本文提出一种新型快速径向基神经网络在线逆模控制策略,并利用锥度准则对控制系统的稳定性进行了理论分析.对强非线性对象的控制仿真结果表明,在保证控制精度的前提下,该算法大大提高了控制器运算的速度,且对扰动、时延、非线性及对象参数的摄动有较强的适应能力,具有较好的控制品质,适合应用于复杂工业过程控制器的设计.     

基于NARX网络的无刷直流电机自适应逆控制

针对无刷直流电机(bnmhless DC motor,BLDCM)非线性的特点,引入了一种基于神经网络的自适应逆控制方法.该方案中,用非线性自回归(NARX)动态网络做为模型辨识器和控制器.辨识器采用了BP(back propagation)算法在线调整参数,并获取被控时象精确的Jacobian信息,再由实时递归学习算法(RTRL)实现对控制器的在线整定.仿真结果表明,方法具有响应速度较快、无超调的优点,且具备较强的自适应性和鲁棒性.     

挖泥船泥浆管道输送流速的自适应预估控制

针对挖泥船泥浆管道输送流速控制的大惯性、大时滞、参数时变和建模困难等特点, 提出一种单神经元自适应预估控制方案. 该方案利用神经网络的自学习能力, 对系统结构、参数、不确定性和非线性进行学习, 结合Marsik和Strejc提出的无辨识自适应控制算法对控制参数进行在线修正, 在控制方案中加入Smith预估器, 利用搜索寻优的方法对时变的时滞进行在线优化, 提高了预估算法的鲁棒性和适应能力. 通过现场实验证明了本控制方法的有效性, 在疏浚施工环境变化, 时滞较大的条件下仍然能够使泥浆流速基本保持稳定, 具有     

基于PNDSC 的欠驱动AUV编队控制器设计

针对含有模型不确定与未知海洋环境扰动下的欠驱动自主水下航行器(AUV)的编队控制问题, 提出一种基于预估器的神经网络动态面(PNDSC) 控制算法. 将动态面法引入控制器的设计中, 采用神经网络逼近AUV模型中的不确定项与海洋环境的扰动, 并结合预估器设计了神经网络权值的离散迭代更新率. Lyapunov 稳定性分析表明, 闭环系统所有信号是一致最终有界的. 仿真结果验证了所提出方法的有效性.

     

基于小波神经网络的板形板厚系统解耦预测控制

带材轧制是一个复杂的非线性过程, 板形控制和板厚控制又是强耦合、非线性、含时延环节的复杂系统. 提出了一种基于小波神经网络的解耦预测控制方案; 利用小波神经网络来辨识原系统的α阶时延逆系统, 将该逆系统与原系统串联后形成一个伪线性复合系统, 从而把多变量系统控制转化为多个单变量系统的控制实现了系统解耦, 并对解耦后的系统采用闭环预测控制. 仿真表明该控制方法具有结构简单、易于实现, 且有较强的抗扰性和鲁棒性.     

时滞对象的自适应Smith预估控制方案

针对时滞被控对象提出了一种自适应Ｓｍｉｔｈ预估控制方案,利用变遗忘因子递推最小二乘法进行参数在线辨识以构成Ｓｍｉｔｈ预估器,采用模糊神经网络控制器完成对被控对象的控制。仿真结果证明了这种方法的有效性。     

Indirect adaptive control of nonlinear dynamic systems using self recurrent wavelet neural networks via adaptive learning rates

This paper proposes an indirect adaptive control method using self recurrent wavelet neural networks (SRWNNs) for dynamic systems. The architecture of the SRWNN is a modified model of the wavelet neural network (WNN). However, unlike the WNN, since a mother wavelet layer of the SRWNN is composed of self-feedback neurons, the SRWNN can store the past information of wavelets. In the proposed control architecture, two SRWNNs are used as both an identifier and a controller. The SRWNN identifier approximates dynamic systems and provides the SRWNN controller with information about the system sensitivity. The gradient-descent method using adaptive learning rates (ALRs) is applied to train all weights of the SRWNN. The ALRs are derived from discrete Lyapunov stability theorem, which are applied to guarantee the convergence of the proposed control system. Finally, we perform some simulations to verify the effectiveness of the proposed control scheme.     

时滞系统的神经网络辨识与控制算法

针对时滞系统、应用神经网络的非线性逼近能力，采用神经网络实现内模控制中被控对象的正模型及内模控制器，用Lyapunov稳定性定理证明神经网络控制系统的稳定性。仿真结果说明神经网络内模控制方案的优越性。     

热工过程时滞对象的神经网络内模控制

针对火电厂热工过程的时滞对象，提出采用基于神经网络的内模控制方法，即用神经网络对复杂系统的辨识能力来实现内模控制中被控对象的正模型及内模控制器。仿真研究表明，文中所采用的控制方案比常规PID控制表现出更好的控制品质，在实际应用中具有一定的实用价值。     

Intelligent transportation control system design using wavelet neural network and PID-type learning algorithms

In this paper, an intelligent transportation control system (ITCS) using wavelet neural network (WNN) and proportional-integral-derivative-type (PID-type) learning algorithms is developed to increase the safety and efficiency in transportation process. The proposed control system is composed of a neural controller and an auxiliary compensation controller. The neural controller acts as the main tracking controller, which is designed via a WNN to mimic the merits of an ideal total sliding-mode control (TSMC) law. The PID-type learning algorithms are derived from the Lyapunov stability theorem, which are utilized to adjust the parameters of WNN on-line for further assuring system stability and obtaining a fast convergence. Moreover, based on H_∞ control technique, the auxiliary compensation controller is developed to attenuate the effect of the approximation error between WNN and ideal TSMC law, so that the desired attenuation level can be achieved. Finally, to investigate the effectiveness of the proposed control strategy, it is applied to control a marine transportation system and a land transportation system. The simulation results demonstrate that the proposed WNN-based ITCS with PID-type learning algorithms can achieve favorable control performance than other control methods.     

基于改进型Volterra 基函数网络的直接自适应逆控制方法

构造一种改进型Volterra基函数网络,其特点是结构简单,容易离线确定最佳网络结构和初始权值。通过利用该网络在线学习非线性系统的逆,构造了一种非线性系统的直接自适应逆控制策略,并从理论上证明了闭环系统跟踪误差一致最终有界。仿真结果表明该方法的鲁棒性能良好。     

基于模糊神经网络的5连杆双足机器人混杂控制

针对双足机器人单脚支撑期控制问题, 提出了一种新型的模糊神经网络混杂控制方法. 该种方法结合了模糊神经网络、H_∞ 控制及逆系统方法的优点. 应用了一种新的多层模糊CMAC神经网络对系统进行逼近, 一方面将模糊神经网络的构造误差看作系统的干扰, 利用H_∞ 控制对干扰进行抑制. 另一方面利用模糊神经网络对系统模型进行逼近, 为逆系统的构建和H_∞ 控制率的设计提供了有效的系统信息. 并证明了在采用本文提出的模糊神经网络和自适应算法后可以抑制 L₂ 增益.     

Development of PI training algorithms for neuro-wavelet control on the synchronization of uncertain chaotic systems

This paper investigates a neuro-wavelet control (NWC) system to address the problem of synchronization control of uncertain chaotic systems. In this NWC system, a wavelet neural network (WNN) controller is the principal tracking controller designed to mimic the perfect control law and an auxiliary compensation controller is used to recover the residual approximation error so that the favorable synchronization can be achieved. Moreover, the proportional-integral (PI) training algorithms of the control system are derived from the Lyapunov stability theorem, which are utilized to update the adjustable parameters of WNN controller on-line for further assuring system stability and obtaining a fast convergence. In addition, to relax the requirement of unknown uncertainty bound, a bound estimation law is derived to estimate the uncertainty bound. Finally, some numerical simulations are presented to illustrate the effectiveness of the proposed control strategy. The simulation results demonstrate that the proposed NWC with PI training algorithms can synchronize the chaotic systems more accurately than the other control strategies.     

Wavelet reduced order observer based adaptive tracking control for a class of uncertain nonlinear systems using reinforcement learning

This Paper investigates the mean to design the reduced order observer and observer based controllers for a class of uncertain nonlinear system using reinforcement learning. A new design approach of wavelet based adaptive reduced order observer is proposed. The proposed wavelet adaptive reduced order observer performs the task of identification of unknown system dynamics in addition to the reconstruction of states of the system. Reinforcement learning is used via two wavelet neural networks (WNN), critic WNN and action WNN, which are combined to form an adaptive WNN controller. The “strategic” utility function is approximated by the critic WNN and is minimized by the action WNN. Owing to their superior learning capabilities, wavelet networks are employed in this work for the purpose of identification of unknown system dynamics. Using the feedback control, based on reconstructed states, the behavior of closed loop system is investigated. By Lyapunov approach, the uniformly ultimate boundedness of the closed-loop tracking error is verified. A numerical example is provided to verify the effectiveness of theoretical development.     

Bioreactor temperature profile controller using inverse neural network (INN) for production of ethanol

This paper presents the use of inverse neural networks (INN) for temperature control of a biochemical reactor and its effect on ethanol production. The process model is derived indicating the relationship between temperature, pH and dissolved oxygen. Using fundamental model obtained data sets; an inverse neural network has been trained using the back-propagation learning algorithm. Two types of temperature profile are used to compare the performance of the INN and conventional PID controllers. These controllers have been simulated in MATLAB for a quantitative comparison. The results obtained by the neural network based INN controller and by the PID controller are presented and compared. There is an improvement in the performance of INN controller in settling time and dead time and steady state error over the PID controller.     

基于电加热炉温度系统的Smith-FNNC-PI复合控制器研究

针对大滞后的电加热炉温度控制系统,研究了一种由Smith预估控制、模糊神经网络控制(FNNC)与传统PI相结合的复合控制器。该控制器将模糊控制具有的较强逻辑推理功能、神经网络具有的较强自学习能力以及传统PI控制的优点融为一体。仿真结果表明该复合式控制器具有良好的稳定性和鲁棒性,对于大时间滞后的电加热炉温控系统是一种实用而简便的控制方法。