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检索条件"机构=State Key Laboratory of Intelligent Control and Decision of-Complex Systems"

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Optimal Distributed Fusion for state Estimation in Multirate Wireless Sensor Networks

Optimal Distributed Fusion for State Estimation in Multirate...

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第三十四届中国控制会议

作者： Lu Jiang Liping Yan Yuanqing Xia Mengyin Fu Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology

ISBN: (纸本)9781467374439

This paper is concerned with the distributed fusion estimation problem for linear system observed by multirate sensors in the environment of wireless sensor networks(WSNs). Rates of the sampling, estimation, transmission in the WSNs are different. The distributed fusion estimation is composed of two stages. At the first stage, every sensor in the WSNs collects measurements of its own to generate a local estimation, then the local estimations from the neighboring sensors and the neighbour's neighbor sensors are further collected to form the fusion estimation at the second stage. The main result is that a distributed fusion estimation algorithm is presented which is simple and low energy consumption. The performance, namely, the effectiveness and the stability of the algorithm under multiple sensors, is analyzed. A numerical example is given to show the feasibility and effectiveness of the presented algorithm.

关键词： state estimation,distributed fusion,multirate multisensor,Kalman filter,wireless sensor networks

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TDMA based IEEE 802.15.4 for Low Latency Deterministic Networked control systems

TDMA based IEEE 802.15.4 for Low Latency Deterministic Netwo...

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第27届中国控制与决策会议

作者： Mashood Anwar Yuanqing Xia School of Automation Key Laboratory of Intelligent Control and Decision of Complex SystemsBeijing Institute of Technology

ISBN: (纸本)9781479970186

In this paper,we propose a time division multiple access(TDMA) based protocol that works on slightly modified IEEE 802.15.4 network in star topology for low latency deterministic networked control *** end device in network transmits its data frame after certain time delay in response to periodic request from network *** time delay is optimized for channel bandwidth utilization and reliable data frame *** this TDMA based protocol eliminates the risk of frame collisions to great extent,MAC sub-layer modifications reduces the non-determinism of the network and increases its bandwidth *** were conducted to evaluate the suggested *** upon these experiments results,the proposed protocol is a feasible solution for control systems with real time constraints.

关键词： IEEE 802154 Networked control system Low latency deterministic networks(LLDN) Medium access control(MAC) Real time systems TDMA

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Wearable Human Foot Mechanical Energy Harvesting Device Based on Moving-coil Generator

Wearable Human Foot Mechanical Energy Harvesting Device Base...

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第三十八届中国控制会议

作者： Ning Ding Fang Deng Yeyun Cai Peng Gui Xinyu Fan School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems

In order to solve the problem of energy supply for smart wearable devices, this paper proposes a wearable human foot mechanical energy harvesting device based on moving-coil generator, and designs a moving-coil type power generation shoes prototype. Firstly, the human foot horizontal movement is analyzed based on the human gait model. Combined with the characteristics of wearable devices, we determine that mechanical energy harvesting device installed in the heel is the most effective. Secondly, the moving-coil generator is designed and the prototype of moving-coil type power shoes is made. Finally,using the movement test platform of the laboratory, We complete the comfort test and optimize the structure, as well as analyze the basic performance of the device, which has good high-frequency characteristics.

关键词： Wearable energy harvesting Moving-coil generator Mechanical energy Human body

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Torque Ripple Reduction of a Modular-Stator Outer-Rotor Flux-Switching Permanent-Magnet Motor

Torque Ripple Reduction of a Modular-Stator Outer-Rotor Flux...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Jing Zhao Yun Zheng Congcong Zhu Hao Chen Liu Yang Key laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology Beijing China

In order to reduce the permanent magnet (PM) volume and combine the advantages of in-wheel motor, a novel modular-stator outer-rotor flux-switching permanent-magnet motor (MSOR-FSPM) whose PM volume is half of that in conventional outer-rotor flux-switching permanent-magnet (COR-FSPM) motor is proposed. However, cogging torque and torque ripple of MSOR-FSPM motor are especially worse due to the inherent double salient effect and the back-EMF harmonics caused by module stator structure. In this paper, structure and operation principle of MSOR-FSPM motor are described simply. Secondly, cogging torque and torque ripple are reduced by using traditional rotor two-step skewing method, but the result is unsatisfactory. Thirdly, a new rotor two-step skewing method is adopted since the ratio of back-EMF period to cogging torque period is the odd. Compared with traditional rotor step skewing method, the new method eliminates the even harmonics of back-EMF and remains the amplitude of fundamental waveform;the odd harmonics of cogging torque and electromagnetic torque are eliminated. Finally, the results of the new rotor step skewing method is verified by 3D finite element method (FEM) and further improved by embedding non-magnetic blocks in the middle of the stator and rotor.

关键词： Rotors Torque Forging Harmonic analysis Brushless motors Torque measurement AC motors

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Distributed Conditional Gradient Algorithm for Two-Network Saddle-point Problem

Distributed Conditional Gradient Algorithm for Two-Network S...

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第34届中国控制与决策会议

作者： Jie Hou Xianlin Zeng Key Laboratory of Intelligent Control and Decision of Complex Systems School of AutomationBeijing Institute of Technology

We consider a two-network saddle-point problem with constraints,whose projections are *** propose a projection-free algorithm,which is referred to as Distributed Frank-Wolfe Saddle-Point algorithm（DFWSP）,which combines the gradient tracking technique and Frank-Wolfe *** prove that the algorithm achieves O（1/k） convergence rate for strongly-convex-strongly-concave saddle-point *** empirically shows that the proposed algorithm has better numerical performance than the distributed projected saddle-point algorithm.

关键词： Saddle-Point Problem Distributed Algorithm Projection-Free Method Convergence Rate

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Modeling of hysteresis in piezoelectric actuator based on adaptive IIR filter

Modeling of hysteresis in piezoelectric actuator based on ad...

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IEEE International Conference on Mechatronics and Automation

作者： Ning Dong Fengmin Shan Xiangdong Liu Key Laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology Beijing China

This paper presents a novel adaptive IIR filter modeling for the hysteresis characteristic in PEA (piezoelectric actuator). First, the PEA hysteresis operators are introduced and the modeling methods of traditional adaptive IIR (infinite-impulse response) filter are discussed. Then, delay operators of IIR adaptive filter are replaced with Backlash operators to compose a new adaptive IIR filter model. During the modeling process, LMS (Least Mean Square) algorithm is used to adjust the weight values. At last the modeling effectiveness is verified via a micro-positioning system experiment platform based on PEA. Experimental results show that the proposed Backlash operator based IIR adaptive filter can achieve accurate hysteresis modeling.

关键词： Adaptation models IIR filters Finite impulse response filters Adaptive filters Mathematical model Hysteresis Delays

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Design and analysis of a novel double-sided five-phase modular linear permanent magnet machine

Design and analysis of a novel double-sided five-phase modul...

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Annual Conference of Industrial Electronics Society

作者： keyu Guo Jing Zhao Xiangdong Liu Liu Yang Hao Chen Key laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology Beijing China

In this paper, in order to replace a conventional electric linear actuator which is consist of rotary PM machine and ball screw, a novel double-sided five-phase modular linear permanent magnet synchronous machine (MLPMSM) is proposed and designed with the same volume. The basic structure of the machine is firstly described and the major dimensions of one module are then optimized to acquire the largest thrust force. Through these methods, the average force of the MLPMSM reaches 206N, which is 58.4% larger than the conventional linear actuator. After that, the 5 th order harmonic in thrust ripple is analyzed and diminished by adjusting the distance between slot openings of the module. As the result the 5 th order harmonic is diminished greatly by 57%.

关键词： Force Optimization Stator cores Actuators Harmonic analysis Iron

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IEEE 802.15.4e LLDN:Superframe Configuration For Networked control systems

IEEE 802.15.4e LLDN:Superframe Configuration For Networked C...

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第三十三届中国控制会议

作者： Mashood Anwar Xia Yuanqing School of Automation Key Laboratory of Intelligent Control and Decision of Complex SystemsBeijing Institute of Technology

Wireless networked control systems have gained significant popularity due to commissioning and maintenance *** there are various wireless communication protocols available to accomplish the control networks. Recently, IEEE802.15.4e protocol for low latency deterministic network has been introduced that shows prominent theoretical characteristics under effective frequency planning to minimize mutual interference. Factory automation, highly exacting from low latency point of view, requires sensors refresh rate not more than of order 10 milliseconds. This new protocol meets such stringent requirement of industrial automation systems. In this paper, we compare the new protocol with its previous version and observe its suitability for industrial networked control systems as a communication protocol. We introduce different LLDN(low latency deterministic network) superframe configurations that show trade-offs among various network parameters. It gives an insight of relationship among various network parameters like sensors refresh rate, number of devices accommodated in network and data payload exchanged between coordinator and end devices with emphasis on different levels of security incorporated.

关键词： Wireless,Networked control systems,IEEE 802.15.4e,LLDN,Industrial wireless networked control systems

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The Distributed System of Smart Wearable Energy Harvesting Based on Human Body

The Distributed System of Smart Wearable Energy Harvesting B...

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第37届中国控制会议

作者： Yeyun Cai Fang Deng Jiachen Zhao Huangbin Qiu Xinyu Fan Zelang Liang School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems

Wearable devices have appeared in every aspect of our lives, from small items such as wristbands and eyeglasses to finished garments as shoes and clothing. With the promoting of scientific development, intelligent technology is also combined with wearable devices to form a unique network that depends on the human body. The increasing demand for equipment has made smart wearable devices a research hotspot. Such equipment is usually small, light-weight, good flexibility, and can be adapted to the complex use of the environment. But these advantages just become the limitations of power supply for ***, the fixed charger can not be used to charge the device during use, and the volume of such a special battery can not be increased in order to increase the storage capacity. Therefore, how to solve the problem of power suppling for the wearable device effectively is a big challenge. Based on this, the paper proposes a distributed system of smart wearable energy harvesting, which considers the human body as the core and uses a variety of ubiquitous energy sources such as solar energy, thermal energy and mechanical energy. The system makes a combination of wearable and distributed design to form a wireless body area network,and provides a stable power output for smart wearable devices.

关键词： wearable energy harvesting distributed system human body

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Multilane Detection and Tracking Based on Binocular Vision Stixel World Estimation and IPM

Multilane Detection and Tracking Based on Binocular Vision S...

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第三十八届中国控制会议

作者： Jing Li Junzheng Wang Guangtao Cui Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology

Road detection is the basic component of many intelligent vehicle systems. In this paper, a robust multi-lane detection method based on binocular vision is proposed. First, a fast estimation technique of the Stixel World, which is the outside environment representation of stereo-vision, is developed. Taking advantage of the estimate for free space under the plane road hypothesis, the proposed method is robust against on-road obstacles when detecting lane markings. Then, the bird-view of the transitable area is obtained through Inverse Perspective Mapping(IPM) Transform;Steerable filter, parallel parabolas modal and RANdom SAmple Consensus(RANSAC) technique are introduced for multi-lane fitting. Experimental results in real urban driving situations indicate that our algorithm is robust under various conditions.

关键词： Multilane detection and tracking Binocular vision Stixel World RANSAC

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