The performance of the model algorithm control method is partially based on the accuracy of the system's model. It is difficult to obtain a good model of a nonlinear system, especially when the nonlinearity is high. ...The performance of the model algorithm control method is partially based on the accuracy of the system's model. It is difficult to obtain a good model of a nonlinear system, especially when the nonlinearity is high. Neural networks have the ability to "learn"the characteristics of a system through nonlinear mapping to represent nonlinear functions as well as their inverse functions. This paper presents a model algorithm control method using neural networks for nonlinear time delay systems. Two neural networks are used in the control scheme. One neural network is trained as the model of the nonlinear time delay system, and the other one produces the control inputs. The neural networks are combined with the model algorithm control method to control the nonlinear time delay systems. Three examples are used to illustrate the proposed control method. The simulation results show that the proposed control method has a good control performance for nonlinear time delay systems.展开更多
Control of pH neutralization processes is challenging in the chemical process industry because of their inherent strong nonlinearity. In this paper, the model algorithmic control (MAC) strategy is extended to nonlinea...Control of pH neutralization processes is challenging in the chemical process industry because of their inherent strong nonlinearity. In this paper, the model algorithmic control (MAC) strategy is extended to nonlinear processes using Hammerstein model that consists of a static nonlinear polynomial function followed in series by a linear impulse response dynamic element. A new nonlinear Hammerstein MAC algorithm (named NLH-MAC) is presented in detail. The simulation control results of a pH neutralization process show that NLH-MAC gives better control performance than linear MAC and the commonly used industrial nonlinear propotional plus integral plus derivative (PID) controller. Further simulation experiment demonstrates that NLH-MAC not only gives good control response, but also possesses good stability and robustness even with large modeling errors.展开更多
This paper presents a nonlinear model predictive control(NMPC) approach based on support vector machine(SVM) and genetic algorithm(GA) for multiple-input multiple-output(MIMO) nonlinear systems.Individual SVM is used ...This paper presents a nonlinear model predictive control(NMPC) approach based on support vector machine(SVM) and genetic algorithm(GA) for multiple-input multiple-output(MIMO) nonlinear systems.Individual SVM is used to approximate each output of the controlled plant Then the model is used in MPC control scheme to predict the outputs of the controlled plant.The optimal control sequence is calculated using GA with elite preserve strategy.Simulation results of a typical MIMO nonlinear system show that this method has a good ability of set points tracking and disturbance rejection.展开更多
The pneumatic artificial muscles are widely used in the fields of medicalrobots, etc. Neural networks are applied to modeling and controlling of artificial muscle system. Asingle-joint artificial muscle test system is...The pneumatic artificial muscles are widely used in the fields of medicalrobots, etc. Neural networks are applied to modeling and controlling of artificial muscle system. Asingle-joint artificial muscle test system is designed. The recursive prediction error (RPE)algorithm which yields faster convergence than back propagation (BP) algorithm is applied to trainthe neural networks. The realization of RPE algorithm is given. The difference of modeling ofartificial muscles using neural networks with different input nodes and different hidden layer nodesis discussed. On this basis the nonlinear control scheme using neural networks for artificialmuscle system has been introduced. The experimental results show that the nonlinear control schemeyields faster response and higher control accuracy than the traditional linear control scheme.展开更多
An adaptive internal mode control is proposed to eliminate effectively periodic disturbance with uncertain frequency caused by input error angle of PIGA (Pendulous Integrating Gyro Accelerometer). An adaptive algori...An adaptive internal mode control is proposed to eliminate effectively periodic disturbance with uncertain frequency caused by input error angle of PIGA (Pendulous Integrating Gyro Accelerometer). An adaptive algorithm with periodic disturbance frequency identification on line is applied and the internal model controller parameters are adjusted to eliminate disturbance. Then the convergence of this algorithm and the stability of the system are proved by the averaging method. Simulation results verify the proposed scheme can eliminate periodic disturbance and improve the test precision for PIGA effectively.展开更多
Polyvinyl chloride (PVC) polymerizing process is a typical complicated industrial process with the characteristics of large inertia, big time delay and nonlinearity. Firstly, for the general nonlinear and discrete t...Polyvinyl chloride (PVC) polymerizing process is a typical complicated industrial process with the characteristics of large inertia, big time delay and nonlinearity. Firstly, for the general nonlinear and discrete time system, a design scheme of model-free adaptive (MFA) controller is given. Then, particle swarm optimization (PSO) algorithm is applied to optimizing and setting the key parameters for controller tuning. After that, the MFA controller is used to control the system of polymerizing temperature. Finally, simulation results are given to show that the MAC strategy based on PSO obtains a good controlling performance index.展开更多
为改善复杂工况下四轴重型自卸车(four-axle heavy dump truck,FAHDT)举升卸货过程的稳定性,防止FAHDT发生侧翻,提出一种基于模糊自抗扰控制(fuzzy active disturbance rejection control,FADRC)算法和混棚阻尼控制(hybrid-hook damping...为改善复杂工况下四轴重型自卸车(four-axle heavy dump truck,FAHDT)举升卸货过程的稳定性,防止FAHDT发生侧翻,提出一种基于模糊自抗扰控制(fuzzy active disturbance rejection control,FADRC)算法和混棚阻尼控制(hybrid-hook damping control,HHDC)算法融合的集成控制方法。首先,构建重型FAHDT举升-行驶耦合动力学模型,以簧载质量质心及货箱质量质心至地面的垂直距离作为稳定性评价指标;随后,结合FADRC-HHDC控制原理与半主动悬架控制策略设计控制器,在TruckSim/Simulink联合仿真环境中开展验证试验;最后,以D级随机路面为典型工况进行仿真分析,将所提控制方法与无控制、单一控制策略的控制效果进行对比。仿真结果表明:所提出的举升作业稳定性控制方法能更有效地抑制FAHDT的侧倾趋势,提升举升卸货过程中的车辆稳定性与作业安全性。展开更多
针对永磁同步电机单矢量模型预测控制在一个周期内只有一个基本电压矢量作用于逆变器,从而造成电流和转矩波动较大,尽管双矢量模型预测控制在一定程度能够改善该问题,但其电压矢量通过遍历法选择,存在计算量大、实时性差等问题,因此提...针对永磁同步电机单矢量模型预测控制在一个周期内只有一个基本电压矢量作用于逆变器,从而造成电流和转矩波动较大,尽管双矢量模型预测控制在一定程度能够改善该问题,但其电压矢量通过遍历法选择,存在计算量大、实时性差等问题,因此提出了一种基于灰狼算法(Grey Wolf Optimizer,GWO)优化BP(Back Propagation,BP)神经网络的永磁同步电机控制方法。将原系统选择最优电压矢量过程看作是一种神经网络分类任务,通过原系统产生的大量离散数据离线训练网络,并利用GWO算法优化BP神经网络的初始权值和偏置,加快神经网络的训练速度和精度,训练好的网络代替模型预测控制,避免矢量遍历选择。最后仿真验证了该控制策略的可行性,有效的减小了电流和转矩的波动,提高了系统控制性能。展开更多
基金supported by the Brain Korea 21 PLUS Project,National Research Foundation of Korea(NRF-2013R1A2A2A01068127NRF-2013R1A1A2A10009458)Jiangsu Province University Natural Science Research Project(13KJB510003)
摘要The performance of the model algorithm control method is partially based on the accuracy of the system's model. It is difficult to obtain a good model of a nonlinear system, especially when the nonlinearity is high. Neural networks have the ability to "learn"the characteristics of a system through nonlinear mapping to represent nonlinear functions as well as their inverse functions. This paper presents a model algorithm control method using neural networks for nonlinear time delay systems. Two neural networks are used in the control scheme. One neural network is trained as the model of the nonlinear time delay system, and the other one produces the control inputs. The neural networks are combined with the model algorithm control method to control the nonlinear time delay systems. Three examples are used to illustrate the proposed control method. The simulation results show that the proposed control method has a good control performance for nonlinear time delay systems.
摘要Control of pH neutralization processes is challenging in the chemical process industry because of their inherent strong nonlinearity. In this paper, the model algorithmic control (MAC) strategy is extended to nonlinear processes using Hammerstein model that consists of a static nonlinear polynomial function followed in series by a linear impulse response dynamic element. A new nonlinear Hammerstein MAC algorithm (named NLH-MAC) is presented in detail. The simulation control results of a pH neutralization process show that NLH-MAC gives better control performance than linear MAC and the commonly used industrial nonlinear propotional plus integral plus derivative (PID) controller. Further simulation experiment demonstrates that NLH-MAC not only gives good control response, but also possesses good stability and robustness even with large modeling errors.
基金Supported by the National Natural Science Foundation of China(21076179)the National Basic Research Program of China(2012CB720500)
摘要This paper presents a nonlinear model predictive control(NMPC) approach based on support vector machine(SVM) and genetic algorithm(GA) for multiple-input multiple-output(MIMO) nonlinear systems.Individual SVM is used to approximate each output of the controlled plant Then the model is used in MPC control scheme to predict the outputs of the controlled plant.The optimal control sequence is calculated using GA with elite preserve strategy.Simulation results of a typical MIMO nonlinear system show that this method has a good ability of set points tracking and disturbance rejection.
基金This project is supported by Foundation of Public Laboratory on Robotics of Chinese Academy of Sciences.
摘要The pneumatic artificial muscles are widely used in the fields of medicalrobots, etc. Neural networks are applied to modeling and controlling of artificial muscle system. Asingle-joint artificial muscle test system is designed. The recursive prediction error (RPE)algorithm which yields faster convergence than back propagation (BP) algorithm is applied to trainthe neural networks. The realization of RPE algorithm is given. The difference of modeling ofartificial muscles using neural networks with different input nodes and different hidden layer nodesis discussed. On this basis the nonlinear control scheme using neural networks for artificialmuscle system has been introduced. The experimental results show that the nonlinear control schemeyields faster response and higher control accuracy than the traditional linear control scheme.
摘要An adaptive internal mode control is proposed to eliminate effectively periodic disturbance with uncertain frequency caused by input error angle of PIGA (Pendulous Integrating Gyro Accelerometer). An adaptive algorithm with periodic disturbance frequency identification on line is applied and the internal model controller parameters are adjusted to eliminate disturbance. Then the convergence of this algorithm and the stability of the system are proved by the averaging method. Simulation results verify the proposed scheme can eliminate periodic disturbance and improve the test precision for PIGA effectively.
基金supported by University of Science and Technology Liaoning,National Financial Security and System Equipment Engineering Research Center(No.USTLKFGJ201502)
摘要Polyvinyl chloride (PVC) polymerizing process is a typical complicated industrial process with the characteristics of large inertia, big time delay and nonlinearity. Firstly, for the general nonlinear and discrete time system, a design scheme of model-free adaptive (MFA) controller is given. Then, particle swarm optimization (PSO) algorithm is applied to optimizing and setting the key parameters for controller tuning. After that, the MFA controller is used to control the system of polymerizing temperature. Finally, simulation results are given to show that the MAC strategy based on PSO obtains a good controlling performance index.
摘要为改善复杂工况下四轴重型自卸车(four-axle heavy dump truck,FAHDT)举升卸货过程的稳定性,防止FAHDT发生侧翻,提出一种基于模糊自抗扰控制(fuzzy active disturbance rejection control,FADRC)算法和混棚阻尼控制(hybrid-hook damping control,HHDC)算法融合的集成控制方法。首先,构建重型FAHDT举升-行驶耦合动力学模型,以簧载质量质心及货箱质量质心至地面的垂直距离作为稳定性评价指标;随后,结合FADRC-HHDC控制原理与半主动悬架控制策略设计控制器,在TruckSim/Simulink联合仿真环境中开展验证试验;最后,以D级随机路面为典型工况进行仿真分析,将所提控制方法与无控制、单一控制策略的控制效果进行对比。仿真结果表明:所提出的举升作业稳定性控制方法能更有效地抑制FAHDT的侧倾趋势,提升举升卸货过程中的车辆稳定性与作业安全性。
摘要针对永磁同步电机单矢量模型预测控制在一个周期内只有一个基本电压矢量作用于逆变器,从而造成电流和转矩波动较大,尽管双矢量模型预测控制在一定程度能够改善该问题,但其电压矢量通过遍历法选择,存在计算量大、实时性差等问题,因此提出了一种基于灰狼算法(Grey Wolf Optimizer,GWO)优化BP(Back Propagation,BP)神经网络的永磁同步电机控制方法。将原系统选择最优电压矢量过程看作是一种神经网络分类任务,通过原系统产生的大量离散数据离线训练网络,并利用GWO算法优化BP神经网络的初始权值和偏置,加快神经网络的训练速度和精度,训练好的网络代替模型预测控制,避免矢量遍历选择。最后仿真验证了该控制策略的可行性,有效的减小了电流和转矩的波动,提高了系统控制性能。