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2015年中国智能自动化学术会议

作者： Hongzhi Chen Yongli Zhao Jie Huang Chang Cheng State Key Laboratory of Hybrid Process Industry Automation System and Equipment Technology Automation Research and Design Institute of Metallurgical Industry Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Fujian Institute of Education

By taking into account the hits-density imaging technique that has been introduced by authors' previous publications, the acoustic emission bursts emitted from the automatic-gauge-control hydraulic cylinder under normal loading and early-stage vibration were investigated. First, six acoustic emission descriptors that showed significance regarding the cumulative probability distribution were visualised, followed by the reconstruction of the hits-density images using these features;Through the visual examination of the hits-density images regarding the cylinders' normal loading and early-stage vibration, apparent visual differences between normal and early-stage vibration under the same loading can be observed;By projecting the hits-density images onto the principal component space, a trajectory which represents the condition developments was observed, which shows a visual-based resolution for dealing with vast transient bursts data reduction,reconstruction and visualisation.

关键词： Visualisation Hits-density imaging Early-stage vibration Acoustic emission

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Study of control parameters tuning method for hydro-viscous driver system

Study of control parameters tuning method for hydro-viscous ...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Ligang Ma Deyang Zhang Shoukun Wang Junzheng Wang Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing China Chinese North Vehicle Research Institute Beijing China

ISBN: (纸本)9781479987719

Hydro-viscous speed clutch (HVC) is a central control element of the driver system. Because of nonlinearities and hysteresis of the clutch, the setting of control parameters has a significant impact on the performance of the speed control system. This paper studies the HVC of a vehicle temperature control system, and analyzes the parameters tuning method of a PID controller for the closed-loop control system. By employing a two-storey optimized control framework, the resulting model from identification can be used to complete the control parameters auto-tuning. Simulation and experimental results have showed that this auto-tuning method can obtain a group of parameters in terms of a desired performance index, which guarantees the balance of dynamic characteristics, stability and anti-jamming in closed-loop system.

关键词： Mathematical model Vehicles Tuning Friction Velocity control Cooling Valves

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A Composite controller Strategy for Electromechanical Actuator Using a Permanent-Magnet Synchronous Motor 33

A Composite Controller Strategy for Electromechanical Actuat...

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第三十三届中国控制会议

作者： WANG Chenyi GAN Minggang QIAO Zhi School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems

ISBN: (纸本)9781479947249

Considering the uncertainties parameters and unknown dynamics of permanent-magnet synchronous motors in real applications,a composite controller strategy for electromechanical actuator is proposed in this *** composite strategy consists of a disturbances observer based on linear extended state observer that suppresses disturbances by feedforward compensation and a Lyapunov stability-based position controller.A non-singular terminal sliding mode position controller is used here due to its good performance,under which state errors would converge to zero in finite ***,special forms of load torque,hinge moment,and sinusoidal torque disturbances have been taken into consideration in this *** proposed control strategy is verified via *** performance with respect to position tracking and robustness to load disturbances and parametric uncertainties of the motor have been demonstrated.

关键词： Electromechanical Actuator,PMSM,Non-Singular Terminal Sliding Mode,Extended State Observer,hinge moment

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A Novel Link Scheduling for Special Re-use TDMA on Ad Hoc Networks 33

A Novel Link Scheduling for Special Re-use TDMA on Ad Hoc Ne...

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第三十三届中国控制会议

作者： Li Weijie School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems

ISBN: (纸本)9781479947249

Special Re-use TDMA(STDMA) emerges as a promising channel access technique for providing Quality of Service(QoS) guarantees in multi-hop ad Hoc networks such as community mesh and sensor networks. The contention-free channel access combined with special reuse of the channel provides significant benefits in the energy/throughput trade-off. However, the protocol may introduce scheduling delay if, on the same path, an outbound link on a router is scheduled to transmit before an inbound link on that router. The total scheduling delay can be quite large since it accumulates at every hop on a path. This paper presents a method to solve this problem to improve the performance of the network system. Compared to the origin STDMA protocol, simulation results present us the superior performance of the proposed algorithm.

关键词： STDMA,multi-hop ad Hoc networks,scheduling delay

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Global MPPT for PV systems under Partially Shaded Conditions Based on Voltage Band 33

Global MPPT for PV Systems under Partially Shaded Conditions...

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第三十三届中国控制会议

作者： Fan Xinyu DENG Fang LI Fengmei School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems

ISBN: (纸本)9781479947249

This paper presents a novel maximum power point(MPP) tracking(MPPT) method to increase photovoltaic(PV)system performance during partially shaded conditions(PSCs). The method is based on voltage scanning method. Voltage band method and restricted voltage scanning method is used to increase the scanning speed. A method is proposed to determine whether partial shading occurs. The main advantage of the proposed method is the ability to search the global peak *** results shows the good performance of proposed method.

关键词： Maximum Power Point Tracking(MPPT),Voltage band,Partially Shaded Conditions

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Sliding Mode control Using linear extended state observer(LESO) and Hysteresis Compensator based on Bouc-Wen model in Sinusoidal Position control of a Piezoelectric Actuator 33

Sliding Mode Control Using linear extended state observer(LE...

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第三十三届中国控制会议

作者： QIAO zhi GAN minggang WANG chenyi School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems

ISBN: (纸本)9781479947249

In this paper,a sliding mode control using LESO coupled with an inverse hysteresis compensator is proposed for the motion tracking control of a microposition system with piezoelectric actuator(PEA).The inverse hysteresis compensator is involved in eliminating the hysteresis nonlinearity reducing the nonlinear system to a linear ***,a sliding mode controller combining with LESO is adopted to handle all the unmodeled dynamics and disturbances,with an intention of improving and enhancing the dynamic performance and the robustness of *** feasibility of the proposed control scheme is verified by experiment of a *** result shows that when faced with a fast-rate control input,the proposed method can also ensure the system a good performance.

关键词： Bouc-Wen Model,Hysteresis Compensator,Sliding Mode control,Linear Extended State Observer

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Multi-Channel Ad Inventory Allocation in Real-Time Bidding Advertising Market

Multi-Channel Ad Inventory Allocation in Real-Time Bidding A...

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第七届社会计算会议

作者： Li Juanjuan Yuan Yong Qin Rui The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100190China Qingdao Academy of Intelligent Industries Qingdao Shandong266109China

Real-time bidding(RTB)advertising is a promising business model emerging with the integration of big data and online *** on analysis of Web users' Cookie data,RTB has the potential of identifying target audiences and delivering best matched ads in real time,and also enabling advertisers bid for each matched ad impression via auction-based programmatic buying *** RTB markets,publishers are suppliers of ad impressions(or ad inventory),and typically they have multiple channels to sell these ad *** this paper,we analyze three commonly-used strategies for publishers to allocate the ad inventory,i.e.,the offline guaranteed contract,the online RTB channel,and the hybrid *** explicitly take the quality of ad impressions into consideration,since it is a key parameter for publishers' decision when choosing a proper channel to sell these ad *** establish models to optimize the reserve price for maximizing the revenue of those publishers choosing the online RTB channel and the hybrid *** also compared these three strategies in pursuit of finding the proper strategy for publishers when selling ad impressions with different qualities.

关键词： Real-time bidding ad inventory allocation reserve price ad impression quality

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Distributed tracking for networked Euler-Lagrange systems without velocity measurements

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Journal of systems Engineering and Electronics 2014年第4期25卷 671-680页

作者： Yang, Qingkai Fang, Hao Mao, Yutian Huang, Jie School of Automation Beijing Institute of Technology Beijing100081 China Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing100081 China

The problem of distributed coordinated tracking control for networked Euler-Lagrange systems without velocity measurements is investigated. Under the condition that only a portion of the followers have access to the leader, sliding mode estimators are developed to estimate the states of the dynamic leader in finite time. To cope with the absence of velocity measurements, the distributed observers which only use position information are designed. Based on the outputs of the estimators and observers, distributed tracking control laws are proposed such that all the followers with parameter uncertainties can track the dynamic leader under a directed graph containing a spanning tree. It is shown that the distributed observer-controller guarantees asymptotical stability of the closed-loop system. Numerical simulations are worked out to illustrate the effectiveness of the control laws. © 2014 Beijing Institute of Aerospace Information.

关键词： Velocity

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Flocking of multi-robot systems with connectivity maintenance on directed graphs

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Journal of systems Engineering and Electronics 2014年第3期25卷 470-482页

作者： Mao, Yutian Dou, Lihua Fang, Hao Chen, Jie School of Automation Beijing Institute of Technology Beijing 100081 China Key Laboratory of Intelligent Control Decision of Complex Systems Beijing 100081 China

Analysis and design techniques for cooperative flocking of nonholonomic multi-robot systems with connectivity maintenance on directed graphs are presented. First, a set of bounded and smoothly distributed control protocols are devised via carefully designing a class of bounded artificial potential fields (APF) which could guarantee the connectivity maintenance, collision avoidance and distance stabilization simultaneously during the system evolution. The connectivity of the underlying network can be preserved, and the desired stable flocking behavior can be achieved provided that the initial communication topology is strongly connected rather than undirected or balanced, which relaxes the constraints for group topology and extends the previous work to more generalized directed graphs. Furthermore, the proposed control algorithm is extended to solve the flocking problem with a virtual leader. In this case, it is shown that all robots can asymptotically move with the desired velocity and orientation even if there is only one informed robot in the team. Finally, nontrivial simulations and experiments are conducted to verify the effectiveness of the proposed algorithm. © 1990-2011 Beijing Institute of Aerospace Information.

关键词： Multipurpose robots

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Distributed observer-based coordination for multiple Lagrangian systems using only position measurements

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IET control Theory and Applications 2014年第17期8卷 2102-2114页

作者： Yang, Qingkai Fang, Hao Chen, Jie Wang, Xueyuan School of Automation Beijing Institute of Technology Beijing100081 China Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing100081 China

This study addresses the distributed coordination problem for multiple Lagrangian systems under a directed graph. Two cases are considered, namely, the distributed tracking control problem with a dynamic leader and the leaderless synchronisation problem. To overcome the difficulty that only positions are measured, a kind of new distributed observer is designed to estimate the velocity for each follower. The velocity observer is updated using only position information from the agent itself and from its neighbours. Based on the outputs of the observer, the distributed control protocols are proposed, respectively, such that the tracking errors locally exponentially converge to zero in the tracking scenario and the agents synchronise in the leaderless synchronisation scenario. Furthermore, the stability of the overall scheme is discussed under the directed interaction graphs that contain a directed spanning tree. Finally, cooperative simulations are provided to show the effectiveness of the proposed observer and control algorithms. © 2014 The Institution of Engineering and Technology.

关键词： Directed graphs

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