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Steam Pressure Control of 1000 MW Ultra-Supercritical Coal-Fired Power Unit Based on Multi-Model Predictive Control
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作者 王国良 丁宝苍 阎威武 《上海交通大学学报:英文版》 EI 2019年第1期86-93,共8页
Ultra-supercritical(USC) coal-fired unit is more and more popular in these years for its advantages.But the control of USC unit is a difficult issue for its characteristic of nonlinearity, large dead time and coupling... Ultra-supercritical(USC) coal-fired unit is more and more popular in these years for its advantages.But the control of USC unit is a difficult issue for its characteristic of nonlinearity, large dead time and coupling among inputs and outputs. In this paper, model predictive control(MPC) method based on multi-model and double layered optimization is introduced for coordinated control of USC unit running in sliding pressure mode and fixed pressure mode. Three inputs(i.e. valve opening, coal flow and feedwater flow) are employed to control three outputs(i.e. output power, main steam temperature and main steam pressure). The step responses for the dynamic matrix control(DMC) are constructed using the three inputs by the three outputs under both pressure control mode. Piecewise models are built at selected operation points. In simulation, the output power follows load demand quickly and main steam temperature can be controlled around the setpoint closely in load tracking control. The simulation results show the effectiveness of the proposed methods. 展开更多
关键词 ULTRA-SUPERCRITICAL COORDINATED CONTROL MULTI-MODEL model PREDICTIVE CONTROL STEAM pressure CONTROL
Adaptive Fuzzy Dynamic Surface Control of Flexible-Joint Robot Systems With Input Saturation 预览
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作者 Song Ling Huanqing Wang Peter X.Liu 《自动化学报:英文版》 CSCD 2019年第1期97-107,共11页
In this paper, we propose an adaptive fuzzy dynamic surface control(DSC) scheme for single-link flexible-joint robotic systems with input saturation. A smooth function is utilized with the mean-value theorem to deal w... In this paper, we propose an adaptive fuzzy dynamic surface control(DSC) scheme for single-link flexible-joint robotic systems with input saturation. A smooth function is utilized with the mean-value theorem to deal with the difficulties associated with input saturation. An adaptive DSC design with an auxiliary first-order filter is used to solve the 'explosion of complexity'problem. It is proved that all the signals in the closed-loop system are semi-globally uniformly ultimately bounded, and the tracking error eventually converges to a small neighborhood around zero. The main advantage of the proposed method is that only one adaptation parameter needs to be updated,which reduces the computational burden significantly. Simulation results demonstrate the feasibility of the proposed scheme and the comparison results show that the improved DSC method can reduce the computational burden by almost two thirds in comparison with the standard DSC method. 展开更多
关键词 Adaptive fuzzy CONTROL dynamic surface CONTROL (DSC) flexible-joint (FJ) ROBOTS single-link TRACKING CONTROL
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The Combination of Two Control Strategies for Series Hybrid Electric Vehicles 预览
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作者 Can Luo Zhen Shen +2 位作者 Simos Evangelou Gang Xiong Fei-Yue Wang 《自动化学报:英文版》 CSCD 2019年第2期596-608,共13页
With most countries paying attention to the environment protection, hybrid electric vehicles have become a focus of automobile research and development due to the characteristics of energy saving and low emission. Pow... With most countries paying attention to the environment protection, hybrid electric vehicles have become a focus of automobile research and development due to the characteristics of energy saving and low emission. Power follower control strategy(PFCS) and DC-link voltage control strategy are two sorts of control strategies for series hybrid electric vehicles(HEVs). Combining those two control strategies is a new idea for control strategy of series hybrid electric vehicles. By tuning essential parameters which are the defined constants under DClink voltage control and under PFCS, the points of minimum mass of equivalent fuel consumption(EFC) corresponding to a series of variables are marked for worldwide harmonized light vehicles test procedure(WLTP). The fuel economy of series HEVs with the combination control schemes performs better compared with individual control scheme. The results show the effects of the combination control schemes for series HEVs driving in an urban environment. 展开更多
关键词 DC-Link VOLTAGE CONTROL power FOLLOWER CONTROL strategy series hybrid electric VEHICLES tuning
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An execution control method for the Aerostack aerial robotics framework
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作者 Martin MOLINA Alberto CAMPORREDONDO +2 位作者 Hriday BAVLE AlejANDro RODRIGUEZ-RAMOS Pascual CAMPOY 《信息与电子工程前沿:英文版》 SCIE EI CSCD 2019年第1期60-75,共16页
Execution control is a critical task of robot architectures which has a deep impact on the quality of the final system. In this study, we describe a general method for execution control, which is a part of the Aerosta... Execution control is a critical task of robot architectures which has a deep impact on the quality of the final system. In this study, we describe a general method for execution control, which is a part of the Aerostack software framework for aerial robotics, and present technical challenges for execution control and design decisions to develop the method. The proposed method has an original design combining a distributed approach for execution control of behaviors(such as situation checking and performance monitoring) and centralizes coordination to ensure consistency of the concurrent execution. We conduct experiments to evaluate the method. The experimental results show that the method is general and usable with acceptable development efforts to efficiently work on different types of aerial missions. The method is supported by standards based on a robot operating system(ROS) contributing to its general use, and an open-source project is integrated in the Aerostack framework. Therefore, its technical details are fully accessible to developers and freely available to be used in the development of new aerial robotic systems. 展开更多
关键词 AERIAL ROBOTICS CONTROL ARCHITECTURE Behavior-based CONTROL EXECUTIVE system
Active fault-tolerant tracking control of a quadrotor with model uncertainties and actuator faults
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作者 Yu-jiang ZHONG Zhi-xiang LIU +2 位作者 You-min ZHANG Wei ZHANG Jun-yi ZUO 《信息与电子工程前沿:英文版》 SCIE EI CSCD 2019年第1期95-106,共12页
This paper presents a reliable active fault-tolerant tracking control system(AFTTCS) for actuator faults in a quadrotor unmanned aerial vehicle(QUAV). The proposed AFTTCS is designed based on a well-known model refere... This paper presents a reliable active fault-tolerant tracking control system(AFTTCS) for actuator faults in a quadrotor unmanned aerial vehicle(QUAV). The proposed AFTTCS is designed based on a well-known model reference adaptive control(MRAC) framework that guarantees the global asymptotic stability of a QUAV system. To mitigate the negative impacts of model uncertainties and enhance system robustness, a radial basis function neural network is incorporated into the MRAC scheme for adaptively identifying the model uncertainties online and modifying the reference model. Meanwhile, actuator dynamics are considered to avoid undesirable performance degradation. Furthermore, a fault detection and diagnosis estimator is constructed to diagnose lossof-control-effectiveness faults in actuators. Based on the fault information, a fault compensation term is added to the control law to compensate for the adverse effects of actuator faults. Simulation results show that the proposed AFTTCS enables the QUAV to track the desired reference commands in the absence/presence of actuator faults with satisfactory performance. 展开更多
关键词 MODEL reference adaptive CONTROL Neural network QUADROTOR FAULT-TOLERANT CONTROL Fault detection and diagnosis
Optimal Control for a Class of Complex Singular System Based on Adaptive Dynamic Programming 预览
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作者 Zhan Shi Zhanshan Wang 《自动化学报:英文版》 CSCD 2019年第1期188-197,共10页
This paper presents a new design approach to achieve decentralized optimal control of high-dimension complex singular systems with dynamic uncertainties. Based on robust adaptive dynamic programming(robust ADP) method... This paper presents a new design approach to achieve decentralized optimal control of high-dimension complex singular systems with dynamic uncertainties. Based on robust adaptive dynamic programming(robust ADP) method, controllers for solving the singular systems optimal control problem are designed. The proposed algorithm can work well when the system model is not exactly known but the input and output data can be measured. The policy iteration of each controller only uses their own states and input information for learning,and do not need to know the whole system dynamics. Simulation results on the New England 10-machine 39-bus test system show the effectiveness of the designed controller. 展开更多
关键词 Adaptive dynamic PROGRAMMING (ADP) DECENTRALIZED CONTROL frequency CONTROL power system SINGULAR systems
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A Reliability Aware Protocol for Cooperative Communication in Cognitive Radio Networks
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作者 Munam Ali Shah Si-Jing Zhang Hong-Ji Yang 《国际自动化与计算杂志:英文版》 EI CSCD 2019年第1期84-92,共9页
One of the challenging tasks in cognitive radio(CR)networks is to agree on a common control channel to exchange control information.This paper presents a novel medium access control(MAC)protocol for CR network which e... One of the challenging tasks in cognitive radio(CR)networks is to agree on a common control channel to exchange control information.This paper presents a novel medium access control(MAC)protocol for CR network which efficiently and intelligently establishes a common control channel between CR nodes.The proposed protocol is the first CR MAC protocol which is hybrid in nature and lies between global common control channel(GCCC)and non-GCCC family of MAC protocols.The dynamic nature of the protocol makes the CR nodes converge on a newly found control channel quicker whenever the interference from a licensed user is sensed.The analytical results show that the dynamic,hybrid and adaptive nature of proposed protocol yields higher throughputs when compared with other CR MAC protocols. 展开更多
关键词 COGNITIVE radio COMMON CONTROL CHANNEL co-operative communication MEDIUM access control(MAC)protocols DTMC
Sliding Mode Fault Tolerant Attitude Control Scheme for Spacecraft with Actuator Faults 预览
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作者 CAO Teng GONG Huajun HAN Bing 《南京航空航天大学学报:英文版》 EI CSCD 2019年第1期119-127,共9页
An active fault tolerant control scheme is investigated for the attitude control systems of spacecraft with external disturbance and actuator faults by using the sliding mode technique. Firstly,the dynamic equations a... An active fault tolerant control scheme is investigated for the attitude control systems of spacecraft with external disturbance and actuator faults by using the sliding mode technique. Firstly,the dynamic equations and kinematic equations of spacecraft are given. For the dynamic mode of spacecraft in faulty case,a fault diagnosis component is used for fault detection and estimation by using a nonlinear observer. According to the fault estimation information obtained during the fault diagnosis,the fault tolerant control scheme is developed by adopting the backstepping sliding mode control technique. Meanwhile,the Lyapunov theory is used to analyze the stability of the closed-loop attitude systems. Finally,simulation results for the attitude dynamics models show the feasibility of the proposed fault tolerant scheme. 展开更多
关键词 FAULT tolerant CONTROL FAULT estimation actuator FAULTS sliding mode CONTROL
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Adaptive and Predictive Control Strategies for Wind Turbine Systems: A Survey 预览
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作者 Magdi S.Mahmoud Mojeed O.Oyedeji 《自动化学报:英文版》 CSCD 2019年第2期364-378,共15页
The wind turbine(WT) is a renewable energy conversion device for transformation of kinetic energy from the wind to mechanical energy for subsequent use in different forms.This paper focuses on wind turbine control des... The wind turbine(WT) is a renewable energy conversion device for transformation of kinetic energy from the wind to mechanical energy for subsequent use in different forms.This paper focuses on wind turbine control design strategies.The content is divided into the following parts: 1) An overview of the recent advances that have been made in the application of adaptive and model predictive control strategies for wind turbines. 2) Summarizes some important aspects of modeling of wind turbines for control studies. 3) Provides an outlook on the application of adaptive model predictive control for uncertain systems to stimulate new research interests for wind turbine systems. We provide an overall picture of the research results with evaluation of the merits/demerits. 展开更多
关键词 ADAPTIVE CONTROL model PREDICTIVE CONTROL WIND turbine(WT)
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Inverse Optimal Control of Evolution Systems and Its Application to Extensible and Shearable Slender Beams 预览
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作者 K.D.Do A.D.Lucey 《自动化学报:英文版》 CSCD 2019年第2期395-409,共15页
An optimal(practical) stabilization problem is formulated in an inverse approach and solved for nonlinear evolution systems in Hilbert spaces. The optimal control design ensures global well-posedness and global practi... An optimal(practical) stabilization problem is formulated in an inverse approach and solved for nonlinear evolution systems in Hilbert spaces. The optimal control design ensures global well-posedness and global practical K∞-exponential stability of the closed-loop system, minimizes a cost functional,which appropriately penalizes both state and control in the sense that it is positive definite(and radially unbounded) in the state and control, without having to solve a Hamilton-Jacobi-Belman equation(HJBE). The Lyapunov functional used in the control design explicitly solves a family of HJBEs. The results are applied to design inverse optimal boundary stabilization control laws for extensible and shearable slender beams governed by fully nonlinear partial differential equations. 展开更多
关键词 BOUNDARY CONTROL evolution system HILBERT space INVERSE optimal CONTROL slender BEAMS
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Optimal Matching Control of a Low Energy Charged Particle Beam in Particle Accelerators 预览
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作者 Zhigang Ren Tehuan Chen Zongze Wu 《自动化学报:英文版》 CSCD 2019年第2期460-470,共11页
Particle accelerators are devices used for research in scientific problems such as high energy and nuclear physics.In a particle accelerator, the shape of particle beam envelope is changed dynamically along the forwar... Particle accelerators are devices used for research in scientific problems such as high energy and nuclear physics.In a particle accelerator, the shape of particle beam envelope is changed dynamically along the forward direction. Thus, this reference direction can be considered as an auxiliary 'time' beam axis. In this paper, the optimal beam matching control problem for a low energy transport system in a charged particle accelerator is considered. The beam matching procedure is formulated as a finite 'time' dynamic optimization problem, in which the Kapchinsky-Vladimirsky(K-V) coupled envelope equations model beam dynamics. The aim is to drive any arbitrary initial beam state to a prescribed target state, as well as to track reference trajectory as closely as possible, through the control of the lens focusing strengths in the beam matching channel. We first apply the control parameterization method to optimize lens focusing strengths, and then combine this with the time-scaling transformation technique to further optimize the drift and lens length in the beam matching channel. The exact gradients of the cost function with respect to the decision parameters are computed explicitly through the state sensitivity-based analysis method. Finally, numerical simulations are illustrated to verify the effectiveness of the proposed approach. 展开更多
关键词 Beam matching COMPUTATIONAL optimal CONTROL CONTROL PARAMETERIZATION sensitivity-based analysis time-scaling transformation
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A Real Time Self-Tuning Motion Controller for Mobile Robot Systems 预览
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作者 Mohamed Boukens Abdelkrim Boukabou Mohammed Chadli 《自动化学报:英文版》 CSCD 2019年第1期84-96,共13页
This paper proposes an intelligent controller for motion control of robotic systems to obtain high precision tracking without the need for a real-time trial and error method.In addition, a new self-tuning algorithm ha... This paper proposes an intelligent controller for motion control of robotic systems to obtain high precision tracking without the need for a real-time trial and error method.In addition, a new self-tuning algorithm has been developed based on both the ant colony algorithm and a fuzzy system for real-time tuning of controller parameters. Simulations and experiments using a real robot have been addressed to demonstrate the success of the proposed controller and validate the theoretical analysis. Obtained results confirm that the proposed controller ensures robust performance in the presence of disturbances and parametric uncertainties without the need for adjustment of control law parameters by a trial and error method. 展开更多
关键词 Learning and adaptive SYSTEMS motion CONTROL METAHEURISTIC robust CONTROL real-time tuning SELF-TUNING WHEELED mobile robot
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Distributed Model Predictive Control for Networked Plant-wide Systems With Neighborhood Cooperation 预览
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作者 Ting Bai Shaoyuan Li Yi Zheng 《自动化学报:英文版》 CSCD 2019年第1期108-117,共10页
For large-scale networked plant-wide systems composed by physically(or geographically) divided subsystems, only limited information is available for local controllers on account of region and communication restriction... For large-scale networked plant-wide systems composed by physically(or geographically) divided subsystems, only limited information is available for local controllers on account of region and communication restrictions. Concerning the optimal control problem of such subsystems, a neighbor-based distributed model predictive control(NDMPC) strategy is presented to improve the global system performance. In this scheme, the performance index of local subsystems and that of its neighbors are minimized together in the determination of the optimal control input, which makes the local control decision also beneficial to its neighboring subsystems and further contributes to improving the convergence and control performance of overall system.The stability of the closed-loop system is proved. Moreover, the parameter designing method for distributed synthesis is provided.Finally, the simulation results illustrate the main characteristics and effectiveness of the proposed control scheme. 展开更多
关键词 Distributed CONTROL model predictive CONTROL (MPC) NEIGHBORHOOD COOPERATION plant-wide SYSTEMS
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船体建造中焊接检验与质量控制分析 预览
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作者 黄海霞 李富 《科技创新与应用》 2019年第7期131-132,共2页
在船体的建造过程中,焊接质量的好坏至关重要,不仅关系到船舶的建造成本,更关系到行驶安全。笔者通过对焊接技术进行研究分析,给出了焊接表面质量和焊接内部质量的相应检测技术,对于焊接前、焊接过程中和焊接后的质量控制进行了分析探讨... 在船体的建造过程中,焊接质量的好坏至关重要,不仅关系到船舶的建造成本,更关系到行驶安全。笔者通过对焊接技术进行研究分析,给出了焊接表面质量和焊接内部质量的相应检测技术,对于焊接前、焊接过程中和焊接后的质量控制进行了分析探讨,得到了相应的原因和预防措施。为相关技术人员学习和进行现场焊接施工提供了参考和指导。 展开更多
关键词 船体 焊接 检验 质量 控制 分析
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塑料包装材料中双酚A毒性及检测研究进展 预览
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作者 汪仕韬 曹霞 +3 位作者 朱昊浩 陈君 王敏 殷晶晶 《包装与食品机械》 CAS 北大核心 2019年第1期69-72,共4页
双酚A(BPA)主要用于生产聚碳酸酯、环氧树脂等高分子材料,广泛用于食品及生活品的包装。本文介绍了BPA的毒性、各国对BPA在食品包装上的管控情况及BPA的仪器分析技术进展,为相关食品包装材料中BPA研究提供参考。
关键词 双酚A(BPA) 毒性 管控 仪器分析
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以英美为教训谈中国雾霾治理策略 预览
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作者 王飞飞 《环境与发展》 2019年第1期1-4,共4页
雾霾环境在国内已持续多年,多方治理并未见显著效果。历史上,经济强国英国美国均发生过雾霾事件。本文借英美雾霾发生及治理的结果剖析中国雾霾现状及治理对策,从经济发展与历史的角度阐述了雾霾现象发生的原因及经验教训。从2010年到2... 雾霾环境在国内已持续多年,多方治理并未见显著效果。历史上,经济强国英国美国均发生过雾霾事件。本文借英美雾霾发生及治理的结果剖析中国雾霾现状及治理对策,从经济发展与历史的角度阐述了雾霾现象发生的原因及经验教训。从2010年到2014年,国内雾霾的严重程度日益加重,同时,我国环保预算大幅增加。但是,雾霾的治理效果并不理想。通过与其他各国案例比较分析,得出结论,健全法律法规体系是遏制环境继续污染的根本途径。单纯的加大财政支出只能治标不治本。另外,要充分发挥社会的力量,环境治理,人人有责。 展开更多
关键词 大气污染 治理 策略 雾霾
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软岩硐室通道掘进围岩控制技术研究 预览
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作者 宋星星 《山东煤炭科技》 2019年第2期80-82,共3页
本文针对五矿软岩巷道稳定性差的特点,对巷道掘进围岩变形破坏情况进行了分析,在此基础上进行锚杆、锚索支护参数的优化设计并对巷道表面进行了喷浆加固。对优化后支护效果进行了现场数据监测,监测结果表明:软岩硐室通道两帮围岩移近量... 本文针对五矿软岩巷道稳定性差的特点,对巷道掘进围岩变形破坏情况进行了分析,在此基础上进行锚杆、锚索支护参数的优化设计并对巷道表面进行了喷浆加固。对优化后支护效果进行了现场数据监测,监测结果表明:软岩硐室通道两帮围岩移近量和顶底板围岩移近量均大幅度降低,成功实现了对中央轨道大巷硐室通道掘进围岩变形的控制. 展开更多
关键词 软岩 围岩 控制
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电解加工间隙检测系统的研制及试验研究
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作者 汪小路 孙伦业 +1 位作者 付志波 王晖 《工具技术》 2019年第3期72-75,共4页
为实现复合进给电解加工机床对刀间隙的实时控制和检测,研制了一种以PMAC多轴运动控制卡、对刀电源和NI6221USB数据采集卡为主要硬件的对刀系统。在研制机床对刀系统过程中,用LabVIEW作为上位机软件开发平台对机床对刀系统进行开发,并... 为实现复合进给电解加工机床对刀间隙的实时控制和检测,研制了一种以PMAC多轴运动控制卡、对刀电源和NI6221USB数据采集卡为主要硬件的对刀系统。在研制机床对刀系统过程中,用LabVIEW作为上位机软件开发平台对机床对刀系统进行开发,并设计了人性化的操作界面。为了验证机床对刀系统的可靠性和稳定性进行了对刀试验。试验结果表明,该系统能够实现对刀电流的采集以及间隙的控制,操作方便,稳定可靠,满足了研发要求。 展开更多
关键词 复合进给 电解加工机床 对刀系统 LABVIEW 控制 检测
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凝结水系统自控方案优化 预览
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作者 谢文奋 《仪器仪表用户》 2019年第4期41-43,81共4页
优化瓦斯回收装置凝结水系统的控制方案,取缔现场的PLC逻辑控制器,将现场仪表测量信号远传至DCS系统,实现远程操作和监控,提高生产安全可靠性,减少设备成本,降低操作人员劳动强度。
关键词 凝结水 控制 PLC逻辑控制器 DCS系统
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水源切换对给水管网水质影响的研究 预览
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作者 翟学东 《环境与发展》 2019年第2期118-119,共2页
水源切换工程可能会造成供水管网中水质指标如铁、浊度、色度超标的黄水问题,严重影响人们的日常生活。本文研究了水源切换对供水管网水质稳定性的影响及控制技术。
关键词 源切换 “黄水” 控制
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