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基于高阶内模的变参考轨迹鲁棒迭代学习控制

计算机应用 2024年第7期44卷 2279-2284页

作者：郑俊豪陶洪峰教育部轻工过程先进控制重点实验室(江南大学) 江苏无锡214122

针对一类带有非重复不确定参数的线性离散系统跟踪批次变化的参考轨迹问题,提出一种双环控制结构的鲁棒间接型迭代学习控制(ILC)算法。通过在内环部分设计比例-积分(PI)型反馈控制器保证闭环系统沿时间轴方向的稳定性,实现前几批次对参... 详细信息

针对一类带有非重复不确定参数的线性离散系统跟踪批次变化的参考轨迹问题,提出一种双环控制结构的鲁棒间接型迭代学习控制(ILC)算法。通过在内环部分设计比例-积分(PI)型反馈控制器保证闭环系统沿时间轴方向的稳定性,实现前几批次对参考轨迹的快速跟踪。在外环部分,通过高阶内模(HOIM)描述参考轨迹变化规律,并设计一个基于内模原理的高阶比例(P)型ILC控制器提升系统在批次方向上对变参考轨迹的跟踪性能,实现对变化的参考轨迹精确跟踪。针对不确定性参数带来的扰动问题,设计一类性能指标函数,将系统模型在间接型ILC控制器作用下转换为等价的重复过程模型;基于重复过程模型稳定性理论,将保证系统具有沿批次鲁棒稳定的性能指标条件转换为线性矩阵不等式(LMI)。最后通过一类永磁电机的控制仿真验证了所提算法的有效性。

关键词：迭代学习控制高阶内模变参考轨迹鲁棒控制重复过程模型

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基于优化堆叠自编码器的故障诊断方法

控制工程 2024年第2期31卷 231-237页

作者：李启泽徐琛陶洪峰杨慧中江南大学物联网工程学院江苏无锡214122 江南大学教育部轻工过程先进控制重点实验室江苏无锡214122

针对当前堆叠自编码器故障诊断方法在识别有效分类特征方面的缺陷,提出一种基于Fisher判别准则优化的堆叠自编码器故障诊断方法。将Fisher判别准则中寻找最佳投影方向的特征学习方法融入到堆叠自编码器的预训练中,利用样本标签信息在堆... 详细信息

针对当前堆叠自编码器故障诊断方法在识别有效分类特征方面的缺陷,提出一种基于Fisher判别准则优化的堆叠自编码器故障诊断方法。将Fisher判别准则中寻找最佳投影方向的特征学习方法融入到堆叠自编码器的预训练中,利用样本标签信息在堆叠自编码器的逐层非线性映射中学习最佳的投影方向。在Fisher判别准则优化的损失函数约束下训练,增加不同类别故障特征的类间距离,减小同类别特征的类内距离。由于在堆叠自编码器的预训练中,同时设计最小化重构特征和最大化分类特征的约束条件,预训练后的堆叠自编码器能够提取到更有效的特征信息,以提升最终故障诊断的准确率。通过在Tennessee Eastman(TE)化工过程的应用验证了所提故障诊断方法的可行性。

关键词：堆叠自编码器 Fisher判别准则故障诊断特征提取

基于自训练SGAN的调压器半监督故障诊断模型

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控制工程 2024年第4期31卷 722-728页

作者：程龙陶洪峰邱吉尔沈凌志江南大学物联网工程学院轻工过程先进控制教育部重点实验室江苏无锡214122

针对实际工况下调压器标记样本稀缺导致故障诊断效果不佳的问题,基于自训练算法与半监督生成对抗网络(semi-supervised generative adversarial network,SGAN)设计了故障诊断模型。首先,对燃气调压器一维压力信号进行预处理,得到灰度图... 详细信息

针对实际工况下调压器标记样本稀缺导致故障诊断效果不佳的问题,基于自训练算法与半监督生成对抗网络(semi-supervised generative adversarial network,SGAN)设计了故障诊断模型。首先,对燃气调压器一维压力信号进行预处理,得到灰度图像样本。之后,基于深度卷积生成对抗网络,设计SGAN进行特征提取,判别器采用具有共享权值的堆叠鉴别器模型。然后,设计自训练算法,使用训练好的初始分类器预测无标签样本的类别标签。最后,采用重复标记方式将满足要求的样本扩充到有标签样本集重新训练,保存最终的分类器。实验结果表明,在少量调压器标签样本的情况下,所提模型依旧具有良好的性能。

关键词：半监督学习生成对抗网络自训练调压器故障诊断

Skew t Distribution-Based Nonlinear Filter with Asymmetric Measurement Noise Using Variational Bayesian Inference

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Computer Modeling in Engineering & Sciences 2022年第4期131卷 349-364页

作者： Chen Xu Yawen Mao Hongtian Chen hongfeng tao Fei Liu Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Jiangnan UniversityWuxi214122China School of Science Jiangnan UniversityWuxi214122China Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 2G6Canada

This paper is focused on the state estimation problem for nonlinear systems with unknown statistics of measurement *** on the cubature Kalman filter,we propose a new nonlinear filtering algorithm that employs a skew t distribution to characterize the asymmetry of the measurement *** system states and the statistics of skew t noise distribution,including the shape matrix,the scale matrix,and the degree of freedom(DOF)are estimated jointly by employing variational Bayesian(VB)*** proposed method is validated in a target tracking *** of the simulation indicate that the proposed nonlinear filter can perform satisfactorily in the presence of unknown statistics of measurement noise and outperform than the existing state-of-the-art nonlinear filters.

关键词： Nonlinear filter asymmetric measurement noise skew t distribution unknown noise statistics variational Bayesian inference

Iterative Learning Fault Diagnosis Algorithm for Non-uniform Sampling Hybrid System

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 534-542页

作者： hongfeng tao Dapeng Chen Huizhong Yang Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Jiangnan UniversityWuxi 214122China

For a class of non-uniform output sampling hybrid system with actuator faults and bounded disturbances,an iterative learning fault diagnosis algorithm is ***,in order to measure the impact of fault on system between every consecutive output sampling instants,the actual fault function is transformed to obtain an equivalent fault model by using the integral mean value theorem,then the non-uniform sampling hybrid system is converted to continuous systems with timevarying delay based on the output delay ***,an observer-based fault diagnosis filter with virtual fault is designed to estimate the equivalent fault,and the iterative learning regulation algorithm is chosen to update the virtual fault repeatedly to make it approximate the actual equivalent fault after some iterative learning trials,so the algorithm can detect and estimate the system faults *** results of an electro-mechanical control system model with different types of faults illustrate the feasibility and effectiveness of this algorithm.

关键词： Equivalent fault model fault diagnosis iterative learning algorithm non-uniform sampling hybrid system virtual fault

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变批次长度非线性时滞系统的迭代学习控制

信息与控制 2023年第4期52卷 542-550,560页

作者：韩洋陶洪峰江南大学教育部轻工过程先进控制重点实验室江苏无锡214122

针对一类变批次长度的非线性系统,研究了其带输入时滞情况下的期望轨迹跟踪PD(proportional-derivative)型迭代学习控制问题。批次长度变化通过系统在时刻点输出的概率进行描述,其造成的跟踪误差信息缺失使用零补偿方法进行修正,以便于... 详细信息

针对一类变批次长度的非线性系统,研究了其带输入时滞情况下的期望轨迹跟踪PD(proportional-derivative)型迭代学习控制问题。批次长度变化通过系统在时刻点输出的概率进行描述,其造成的跟踪误差信息缺失使用零补偿方法进行修正,以便于不同批次控制律的全时间轴信息更新;然后基于给定超前法设计PD型迭代学习控制算法,消除输入时滞对控制律更新的影响;再根据数学期望与范数分析证明了所提算法能够保证跟踪误差在初始状态相同时严格收敛,在初始状态不同时期望收敛。最后通过直流电机驱动单杆系统的输出跟踪控制仿真验证了所提算法的有效性。

关键词：迭代学习控制变批次长度非线性系统输入时滞

Localization of q-form fields on a de Sitter brane in chameleon gravity

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Frontiers of physics 2024年第3期19卷 11-18页

作者： Yi Zhong tao-tao Sui School of Physics and Electronics Science Hunan UniversityChangsha 410082China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Provinceand Key Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China College of Physics Nanjing University of Aeronautics and AstronauticsNanjing 211106China

Recently,it was found that the vector field can be naturally localized on the thick brane in chameleon *** this work,we extend this study to encompass de Sitter brane *** focus on the localization of q-form *** scalar and vector fields can be localized on the de Sitter brane,while the KR field cannot be *** condition for localization of the scalar and vector fields is ***,we investigate the localization characteristics in two examples with given conformal factor b(ϕ).In the first case,the effective potentials and KK modes of the matter fields are obtained asymmetric even though the de Sitter brane has Z2 *** the second case,volcano-like effective potentials are generated in the de Sitter brane model.

关键词： brane q-form field chameleon gravity

A Global Optimality Principle for Fully Coupled Mean-field Control Systems

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 379-413页

作者： tao HAO School of Statistics and Mathematics Shandong University of Finance and EconomicsJinan 250014China

This paper concerns a global optimality principle for fully coupled mean-field control *** the first-order and the second-order variational equations are fully coupled mean-field linear FBSDEs. A new linear relation is introduced, with which we successfully decouple the fully coupled first-order variational equations. We give a new second-order expansion of Y^(ε) that can work well in mean-field framework. Based on this result, the stochastic maximum principle is proved. The comparison with the stochastic maximum principle for controlled mean-field stochastic differential equations is supplied.

关键词： optimal control global maximum principle fully coupled general mean-field FBSDE adjoint equation recursive utility

Track-before-detect for bistatic radar based on pseudo-spectrum

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Chinese Journal of Aeronautics 2024年第1期37卷 236-246页

作者： tao HAN Gongjian ZHOU School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Marine Environmental Monitoring and Information Processing Ministry of Industry and Information TechnologyHarbin 150001China

Track-Before-Detect(TBD) is an efficient method to detect dim targets for radars. Conventional TBD usually follows an approximate motion model of the target, which may cause an inaccurate integration of the target energy. A TBD technique on basis of pseudo-spectrum in mixed coordinates adopting an accurate motion model for bistatic radar system is developed in this *** predicted position in bistatic polar plane is derived according to a nonlinear function that exactly describes the constant Cartesian velocity motion. Then around the predicted position, a pseudo-spectrum is formulated and its samples are accumulated to the integration frame for energy integration. The evolution of the state and the procedure of accumulation of the target energy are derived elaborately. The superior performance of the proposed method is demonstrated by some simulations.

关键词： Weak target detection Bistatic radar Track-before-detect Pseudo-spectrum Multiframe integration