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2019 IEEE 8th Data Driven Control and Learning Systems Conference (DDCLS)最新文献

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A DSC Based Adaptive Control Scheme for A Class of Uncertain Non-lower Triangular Nonlinear Systems 一类不确定非下三角非线性系统的DSC自适应控制方法
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908994
Gang Sun, Mingxin Wang
An adaptive tracking controller design method is developed for a class of nonlinear systems with non-lower triangular form and linear parameterized uncertainties by combining backstepping and dynamic surface control (DSC) technology. In the design, traditional backstepping design process is used to establish control laws recursively, and unknown parameters of control laws are estimated online. By using DSC technology, the problem of circular structure of the controller is eliminated. Stability results of closed-loop system show that the uniform ultimate boundedness of closed-loop system signals can be guaranteed. Besides, the steady state tracking error of the system can be adjusted to a small neighborhood of zero by selecting appropriate control parameters. The efficacy of the designed approach is demonstrated via a numerical simulation example.
针对一类具有非下三角形和线性参数化不确定性的非线性系统,将反演技术与动态曲面控制技术相结合,提出了一种自适应跟踪控制器设计方法。在设计中,采用传统的反步设计过程递归建立控制律,并在线估计控制律的未知参数。采用DSC技术,消除了控制器的圆形结构问题。闭环系统的稳定性结果表明,闭环系统信号的一致极限有界性是可以保证的。此外,通过选择合适的控制参数,可以将系统的稳态跟踪误差调整到零的小邻域。通过数值仿真算例验证了所设计方法的有效性。
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引用次数: 0
A Novel Self-tuning Control Method with Application to Nonlinear Processes 一种应用于非线性过程的自整定控制方法
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908973
Bi Zhang, Xiaowei Tan, Xingang Zhao
Hammerstein models have been considered as a class of well-known nonlinear systems, which have been prove to be attractive for system modeling and controller design tasks. In this brief, we introduce a new control strategy for such kind of systems. Interestingly, the system uncertainties, including the input block description error, the linear subsystem's unstable zero property and the colored added noise issues, have all been considered. According to the modified cost function, the parameter adaptation law has been online implemented throughout the use of a robust estimator. Meanwhile, based on the parameter estimates, the control law has been designed for the compensation of the modeling mismatch which is caused by unmodeled dynamics estimation. A simple but rigorous proof has been given to illustrate that the nonlinear model based control system stability can be properly achieved based on some reasonable and practical conditions. Finally, the proposed controller has been used for a representative nonlinear system, that is, a continuous stirred tank reactor (CSTR) system. Comparison studies have been presented to show the wider applicability of the novel method than some existing ones.
Hammerstein模型已被认为是一类众所周知的非线性系统,它已被证明是有吸引力的系统建模和控制器设计任务。本文介绍了一种新的控制策略。有趣的是,系统的不确定性,包括输入块描述误差,线性子系统的不稳定零特性和彩色附加噪声问题,都被考虑在内。根据修正后的代价函数,利用鲁棒估计器在线实现了参数自适应律。同时,在参数估计的基础上,设计了控制律,对未建模的动力学估计引起的建模失配进行补偿。给出了一个简单而严谨的证明,说明基于非线性模型的控制系统在一定的合理和实际条件下是可以实现稳定的。最后,将所提出的控制器应用于具有代表性的非线性系统,即连续搅拌槽式反应器(CSTR)系统。比较研究表明,这种新方法比现有的方法适用性更广。
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引用次数: 0
Feature Extraction for Controller Design by Deep Auto-Encoder Neural Network and Least squares Policy Iteration 基于深度自编码器神经网络和最小二乘策略迭代的控制器设计特征提取
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908971
Dazi Li, Zhudan Chen, Xin Ma, Q. Jin
Due to the extensively existing complexity and uncertainty of systems, feature extraction based on samples is an important task in controller design. As one of the research hotspots, deep auto-encoder neural network can be used to extract features from raw data. This paper proposed a modified deep auto-encoder neural network (MDAENN). An accelerated proximal gradient (APG) method is proposed in this method. MDAENN has lower computational complexity, easier parameters tuning and better convergence than traditional neural network methods, such as RBF, in feature extraction and reconstruction. Based on the feature extraction, least squares policy iteration (LSPI) is used to design the optimal controller. When the dimension of state space is large or even continuous, value function approximation (VFA) method is used instead of value function. Experimental results show that the proposed method can successfully deal with feature extraction and learn control policies with low computational complexity.
由于系统普遍存在复杂性和不确定性,基于样本的特征提取是控制器设计中的一项重要任务。深度自编码器神经网络可以从原始数据中提取特征,是研究热点之一。提出了一种改进的深度自编码器神经网络(MDAENN)。提出了一种加速近端梯度法(APG)。与传统神经网络方法(如RBF)相比,MDAENN在特征提取和重构方面具有计算复杂度低、参数调整容易、收敛性好等优点。在特征提取的基础上,采用最小二乘策略迭代(LSPI)设计最优控制器。当状态空间维数较大甚至连续时,采用值函数逼近法代替值函数法。实验结果表明,该方法能够成功地处理特征提取和控制策略学习,且计算复杂度较低。
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引用次数: 0
Adaptive Reinforcement Learning Tracking Control for Second-Order Multi-Agent Systems 二阶多智能体系统的自适应强化学习跟踪控制
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908978
Weiwei Bai, Liang Cao, Guowei Dong, Hongyi Li
In this paper, the adaptive reinforcement learning tracking control problem is studied for second-order pure-feedback multi-agent systems (MASs). The pure-feedback MASs are transformed into strict-feedback form by using the mean value theorem. The reinforcement learning approach is applied to handle the unknown functions and system control performance index. Moreover, the error terms are introduced to the controller, which can improve the robust of the control scheme. The theoretical analysis indicates that all the signals and tracking errors in close-loop system are semi-global uniformly ultimately bounded (SGUUB), and the numerical simulation are conducted to verify the superiority of this scheme.
研究了二阶纯反馈多智能体系统的自适应强化学习跟踪控制问题。利用中值定理将纯反馈质量转化为严格反馈形式。采用强化学习方法处理未知函数和系统控制性能指标。此外,在控制器中引入误差项,提高了控制方案的鲁棒性。理论分析表明,闭环系统的所有信号和跟踪误差都是半全局一致最终有界的(SGUUB),并通过数值仿真验证了该方案的优越性。
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引用次数: 2
Improved SVDD-WMV Method for Fluidized Bed Multi-Sensor Agglomeration Detection 改进的SVDD-WMV方法用于流化床多传感器团聚检测
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908938
Yu Chen, Haiyan Wu, Jing Wang
Multi-sensor based fluidized bed reactor (FBR) agglomeration monitoring system faces the problem with mismatching from different sensors. Moreover, acoustic signals are sensitive to agglomeration as well as the environment interference, so information fusion method is required to improve the stability of fault monitoring systems based on acoustic sensors. In this paper, a support vector data description (SVDD) combined with improved weighted majority voting (WMV) method is proposed for FBR. Firstly, sigmoid function is added to each SVDD model, so the Boolean outputs of SVDD are converted to probability estimations to meet the need of information fusion and improve the detection accuracy. Moreover, a multi-penalty parameter is designed to evaluate classifier in different situations, replacing the single overall penalty parameter in general WMV method. Through the penalty vector, performance of each classifier is added to the prior condition of voting. The proposed method is tested in a pilot device. From the test results, it can be concluded that the conflict handling performance of proposed method is enhanced greatly, and the decision risk is reduced. Compared with that of general method, the detection accuracy of proposed method is improved.
基于多传感器的流化床反应器(FBR)团聚监测系统面临不同传感器的不匹配问题。此外,声信号对聚集和环境干扰非常敏感,因此需要采用信息融合的方法来提高基于声传感器的故障监测系统的稳定性。本文提出了一种支持向量数据描述(SVDD)与改进加权多数投票(WMV)相结合的FBR算法。首先,在每个SVDD模型中加入sigmoid函数,将SVDD的布尔输出转换为概率估计,满足信息融合的需要,提高检测精度;此外,设计了一个多惩罚参数来评估不同情况下的分类器,取代了一般WMV方法中单一的总体惩罚参数。通过惩罚向量,将每个分类器的性能添加到投票的先验条件中。该方法已在中导装置上进行了试验。测试结果表明,该方法的冲突处理性能得到了较大的提高,降低了决策风险。与一般方法相比,该方法的检测精度得到了提高。
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引用次数: 0
Iterative Learning Control for Automatic Train Operation with Discrete Gears 离散齿轮列车自动运行的迭代学习控制
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8909057
Hua Chen, Z. Xiong, Yindong Ji
In the traditional iterative learning control (ILC) for automatic train operation (ATO), control inputs are usually continuous signals. In this paper, a practical ILC is presented to carry out the train operation by discrete traction or braking force. The train motion dynamic model is described by linear time-varying perturbation model along with the reference trajectories, which can be identified by the historical data. The ILC based on the perturbation model can be easily used to the case with the continuous control signals because the updating law of the ILC can be derived theoretically. Then the proposed ILC method is extended to the case with discrete gears by transforming the ILC with discrete control signals into a well-defined mixed integer programming (MIP) problem. The proposed method has been illustrated on the simulation case. Simulation results show that the method can not only track the reference trajectories to a fine accuracy but also restrict the gear shift frequency of the operation process, which is helpful to improve the ride comfort index of the whole train operation.
在传统的列车自动运行迭代学习控制(ILC)中,控制输入通常是连续信号。本文提出了一种实用的自动控制系统,利用离散牵引力或制动力实现列车运行。列车运动动力学模型采用随参考轨迹的线性时变摄动模型来描述,该模型可通过历史数据进行识别。基于摄动模型的ILC可以从理论上推导出ILC的更新规律,可以很容易地应用于控制信号连续的情况。然后将控制信号离散的ILC问题转化为一个定义良好的混合整数规划问题,将所提出的ILC方法推广到具有离散齿轮的情况。仿真算例说明了该方法的有效性。仿真结果表明,该方法既能较好地跟踪参考轨迹,又能有效地限制列车运行过程中的换挡频率,有利于提高列车整体运行的乘坐舒适性。
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引用次数: 2
A Check Valve Fault Diagnosis Method Based on Variational Mode Decomposition and Permutation Entropy 基于变分模态分解和置换熵的单向阀故障诊断方法
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8909065
Zhen Pan, Guoyong Huang, Yugang Fan
Aiming at the problem that the vibration signal of the check valve has background noise and low fault recognition rate, a signal characteristics extraction method based on variational mode decomposition and permutation entropy was proposed. The extreme learning machine was used for fault recognition. Firstly, the check valve vibration signal was decomposed by the variational mode decomposition, and the intrinsic mode functions were obtained in different scales. Secondly, the permutation entropy of each intrinsic mode function was calculated and used to compose the multiscale feature vector. Finally, the high-dimensional feature vector was input to the extreme learning machine for check valve fault diagnosis. The comparison is made with EEMD and LCD (local characteristic-scale decomposition). The experimental results show that the method can effectively identify the fault type of the check valve.
针对单向阀振动信号存在背景噪声和故障识别率低的问题,提出了一种基于变分模态分解和排列熵的信号特征提取方法。采用极限学习机进行故障识别。首先,对单向阀振动信号进行变分模态分解,得到不同尺度下单向阀的固有模态函数;其次,计算各本征模态函数的排列熵,并利用其组成多尺度特征向量;最后,将高维特征向量输入极限学习机进行单向阀故障诊断。并与EEMD和LCD(局部特征尺度分解)进行了比较。实验结果表明,该方法能有效地识别止回阀的故障类型。
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引用次数: 0
Adaptive Fuzzy Control for a Constrained Robot in the Presence of Input Nonlinearity 输入非线性约束下机器人的自适应模糊控制
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908900
Linghuan Kong, Wei He
An adaptive fuzzy finite-time control policy is developed for an uncertain $n$-link robot with input saturation and time-varying output constraints. Compared with previous works, the introduced finite-time stability criterion is used for the tracking control of the robot. Furthermore, cot-type Barrier Lyapunov functions (BLFs) are introduced for guaranteeing output constraints, which can be considered as a substitution of other BLFs. A fuzzy approximation-based adaptive finite-time control scheme is constructed for stabilizing the robotic system. With Lyapunov theory, it has been proved that all the error signals are semi-global practical finite-time stable (SGPFS). At last, the effectiveness of the proposed scheme is verified by simulation results.
针对具有输入饱和和时变输出约束的不确定n连杆机器人,提出了一种模糊自适应有限时间控制策略。与以往的研究相比,本文将引入的有限时间稳定性准则用于机器人的跟踪控制。此外,为了保证输出约束,引入了cot-type Barrier Lyapunov函数(blf),可以将其视为其他blf的替代。为了稳定机器人系统,构造了一种基于模糊逼近的自适应有限时间控制方案。利用李雅普诺夫理论,证明了所有误差信号都是半全局实用有限时间稳定的。最后,通过仿真结果验证了所提方案的有效性。
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引用次数: 0
Adaptive Neural Inverse Optimal Control for a Class of Strict Feedback Stochastic Nonlinear Systems 一类严格反馈随机非线性系统的自适应神经逆最优控制
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908901
Fengxue Cao, Tingting Yang, Yong-ming Li, Shaocheng Tong
This study develops an adaptive neural inverse optimal control method for a class of stochastic nonlinear systems. Neural networks (NN) are used to approximate the unknown nonlinear functions. The designed inverse optimal control strategy avoids the objective of solving the Hamilton-Jacobi-Bellman (HJB) equation and devises an optimal controller, which is related to the meaningful cost functional. Based on adaptive backstepping algorithm and Lyapunov stability theory, it is proved that the proposed control strategy guarantees the asymptotic stability in probability of the control systems and solves the inverse optimal problem.
研究了一类随机非线性系统的自适应神经逆最优控制方法。神经网络(NN)用于逼近未知的非线性函数。所设计的逆最优控制策略避免了求解Hamilton-Jacobi-Bellman (HJB)方程的目标,设计了一个与有意义代价泛函相关的最优控制器。基于自适应反步算法和Lyapunov稳定性理论,证明了所提出的控制策略保证了控制系统的概率渐近稳定,并解决了逆最优问题。
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引用次数: 6
Direct Learning Control of Trajectories Subject to Second-Order Internal Model for a Class of Nonlinear Systems 一类非线性系统二阶内模轨迹的直接学习控制
Pub Date : 2019-05-01 DOI: 10.1109/DDCLS.2019.8908897
W. Zhou, Miao Yu
In this paper, we focus on the direct learning control method for a class of continuous-time nonlinear systems with parametric uncertainties. First, the definitions of direct learning control are introduced. Second-order internal model is used to define the structure of non-repeatable reference trajectories. Then, a direct learning control algorithm is proposed to achieve control objective without iterations. By means of historical control data, direct learning control technique operates in a direct way. In order to achieve a satisfactory tracking performance, the second-order internal model is applied and embedded into the direct learning control law. Finally, the efficacy of the proposed direct learning control algorithm is demonstrated by a single-link robotic manipulator with desired trajectory matching second-order internal model.
研究了一类具有参数不确定性的连续非线性系统的直接学习控制方法。首先,介绍了直接学习控制的定义。采用二阶内模来定义不可重复参考轨迹的结构。在此基础上,提出了一种无需迭代即可实现控制目标的直接学习控制算法。直接学习控制技术利用历史控制数据,直接进行控制。为了获得满意的跟踪性能,将二阶内部模型嵌入到直接学习控制律中。最后,以期望轨迹匹配二阶内模型的单连杆机械臂为例,验证了所提直接学习控制算法的有效性。
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引用次数: 1
期刊
2019 IEEE 8th Data Driven Control and Learning Systems Conference (DDCLS)
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