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第29届中国控制与决策会议

作者： Lianchun Wang Peichang Yu Jinhui Li Danfeng Zhou Jie Li College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509046584

The objective of this paper is to design a new method,based on machine learning,to detect the abnormal status of the suspension system of maglev train by using the real-time signals collected by the levitation *** abnormal status is harmful to the operation of maglev *** is necessary to detect the abnormity ***,the operation data of train is recorded online,but it is analyzed by experts off-line,the efficiency of this approach is very ***,an efficient and accurate method is urgently *** are 120 levitation sensors in a carriage,which measure the levitation states with nearly 40 khz sampling *** tradition,the information of sensors is just used as the feedback of suspension *** paper will study how to use these information for detecting the abnormal status of suspension system by using support vertical machine(SVM).Firstly,some reasonable features originate from experience are extracted from levitation ***,considering that the fault rate is very low,resulting in less fault ***,the SVM method is *** last,the raised machine learning model is applied in the practical usage on maglev train by using the programming in the Digital signal processor(DSP) *** this method,the existing abnormal status of suspension system can be diagnosed in *** experiment results show that this algorithm can achieve the detection accuracy of 91.3%.

关键词： Machine learning Support Vertical Machine Suspension System Maglev train

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Sitting Posture Detection using Adaptively Fused 3D Features 2

Sitting Posture Detection using Adaptively Fused 3D Features

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2017 IEEE 2nd Information Technology, Networking, Electronic and automation Control Conference (ITNEC 2017)

作者： Sun Bei Zeng Xing Liu Taocheng Lu Qin College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509064151;9781509064144

This paper presents a sitting posture detection method based on a depth sensor. Effectively detecting bad sitting posture can help protect eyesight and prevent cervical *** most current approaches conduct the sitting detection with traditional sensors, which leads to inferior performance. Therefore, this paper introduces a novel method based on a depth sensor, in which we 1) model the sitting posture by splitting body profile and locating six body joints, 2) extract two kinds of features: relative topological characters and local edge features, and 3) jointly fuse the two features for sitting posture detection. The proposed method is tested on our 3 D sitting posture dataset, which includes 18 individuals, and totally 9 different sitting postures. The experimental results show that, using an adaptively fusion of the joints features, this method performs a high accuracy(more than 94%) and achieves a real-time detection(17 fps).

关键词： depth image sitting posture modeling sitting posture detection

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Magnetic Flux Density Modeling Method of Maglev System 36

Magnetic Flux Density Modeling Method of Maglev System

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第36届中国控制会议

作者： Qiang Chen Siyang Zhou Jie Li College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781538629185

Modeling is the basis work of the analysis and design of a control system,and models obtained by different modeling methods have different *** the maglev system,current is generally used as a state to *** analysis and comparison in this paper,compared with modeling with current state,using magnetic flux density as a state to model the maglev system,the model is much simpler,the linear model is more accurate and more close to the real ***,based on the model built by magnet flux density state method,state feedback is more beneficial to the stabilization of the system,the control performance is better and the coupling interference between suspension points is smaller.

关键词： Maglev Model Magnetic Flux Density

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Centralized Control Implementation Using Distributed Observer for Meglev Systems 36

Centralized Control Implementation Using Distributed Observe...

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第36届中国控制会议

作者： Qiang Chen Ying Tan Qing Yang Jie Li Iven Mareels College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781538629185

In the control of maglev systems,decentralized control structure is widely used due to its *** to the existence of mechanical coupling,the performance of decentralized control is *** paper focuses on designing a centralized controller for a small maglev platform that already has a decentralized control structure.A distributed reduced-order observer is first proposed for one suspension point to estimate the state of other suspension points using the model of the ***,a centralized control is designed and implemented with the help of the proposed decentralized *** simulation results show that centralized control based on distributed observer can reject the state coupling of maglev system and improve the maglev control performances *** future,the proposed distributed observer based centralized controller will be tested on the small maglev platform.

关键词： Maglev Centralized Control Distributed Observer

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Probabilistic Teleportation of an Arbitrary Two-Qubit State via Positive Operator-Valued Measurement with Multi Parties

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Communications in Theoretical Physics 2017年第4期67卷 377-382页

作者：石磊魏家华李云霞马丽华薛阳罗均文 Information and Navigation College Air Force Engineering University Department of Automatic Control College of Mechatronics and AutomationNational University of Defense Technology

We propose a novel scheme to probabilistically transmit an arbitrary unknown two-qubit quantum state via Positive Operator-Valued Measurement with the help of two partially entangled states. In this scheme, the teleportation with two senders and two receives can be realized when the information of non-maximally entangled states is only available for the senders. Furthermore, the concrete implementation processes of this proposal are presented, meanwhile the classical communication cost and the successful probability of our scheme are calculated.

关键词： probabilistic teleportation positive operator-valued measurement successful probability classical communication cost

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Gender Recognition Using Dynamic Gait Energy Image 2

Gender Recognition Using Dynamic Gait Energy Image

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2017 IEEE 2nd Information Technology, Networking, Electronic and automation Control Conference (ITNEC 2017)

作者： Taocheng Liu Bei Sun Mingyi Chi Xing Zeng College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509064151;9781509064144

This paper presents an improved gait energy image(GEI) named D-GEI. Nowadays, numerical literatures have focused on gait analysis, yet most approaches do not fully exploit the dynamic walking information, which leads to inferior performance under the appearance change and viewpoint variation. Furthermore, an improved gait energy image, D-GEI,is proposed. Firstly, we calculate and divide the GEI into dynamic region. Then the region of GEI has the logic ‘and'operation with the sequence to get the dynamic region of ***, we calculate the weighted average of these dynamic regions to get the D-GEI. In tests, HOG characteristics of D-GEI is regarded as features representation and the tests based on the CASIA dataset are conducted, in which we select the SVM as classifier. The experimental results show that with HOG based on dynamic gait energy image, the proposed method outperforms HOG based on GEI method.

关键词： gender recognition dynamic gait energy image HOG SVM

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Satellite-ground Joint Positioning System Based on Pseudolite

Satellite-ground Joint Positioning System Based on Pseudolit...

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IEEE Chinese Guidance, Navigation and Control Conference (CGNCC)

作者： Chao Ma Jun Yang Jianyun Chen College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (数字)9781538611715

ISBN: (纸本)9781538611722

With the development of new industries such unmanned aerial vehicles (UAV), the accuracy and reliability of positioning and navigation are higher. Relying on the existing satellite system, it is impossible to provide high precision three-dimensional positioning because of the poor Vertical Dilution of Precision (VDOP). We use pseudo-satellite (pseudolite) technology to improve the DOP value, and give some suggestions for the construction of the whole system.

关键词： Clocks Satellite broadcasting Timing Receivers Antenna arrays Directive antennas Satellite navigation systems

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Active Compliance Control for a Hydraulically-Actuated Articulated Robotic Leg 29

Active Compliance Control for a Hydraulically-Actuated Artic...

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第29届中国控制与决策会议

作者： Changyou Li Honglei An Hongxu Ma Qing Wei College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509046584

This paper focus on the modelling and control of a hydraulically-actuated biologically-inspired articulated robotic *** leg has two hydraulically-actuated degrees of freedom(DoF),the hip and knee joints,and a passive spring DoF,the ankle *** a brief description of the prototype leg,the paper developed a nonlinear model of the leg,including its kinematics and ***,an actively compliant control architecture based on outer virtual compliant leg model and inner torque controller was designed to achieve a spring-damper like touchdown dynamics ***,both a Pushdown experiment and a Dropdown experiment were carried to verify the designed *** result confirmed that a hydraulically-actuated robot articulated leg can successfully emulate virtual passive components through proper mechanical design and actively compliant control under dynamic situations.

关键词： Active Compliance Control Virtual Leg Model Hydraulic Actuation Bio-inspired Leg

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Research on Fault-Tolerant Control Problem for Suspension System of Medium Speed Maglev Train 29

Research on Fault-Tolerant Control Problem for Suspension Sy...

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第29届中国控制与决策会议

作者： Le Jin Zhiqiang Long Jiewei Zeng College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509046584

With suspension control of the medium speed maglev train as the research background,a new suspension joint structure is proposed and an active fault-tolerant control algorithm based on state gain refactoring is designed by referring to the joint structure of high speed maglev train of German and the patent from *** new structure connects the two adjacent bogies by mechanical structure,which not only increases the redundancy degree of the system but also takes the fault-tolerant control problem of the end bogie into *** demonstrates that the joint structure and its active fault-tolerant control method can increase significantly the fault-tolerant performance of suspension system,which can contribute greatly to engineering application.

关键词： low-middle speed maglev train suspension system joint structure active fault-tolerant control

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A Practical Magnetic Flux Density Observer for Hybrid Suspension System of Maglev Train 36

A Practical Magnetic Flux Density Observer for Hybrid Suspen...

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第36届中国控制会议

作者： Lianchun Wang Peichang Yu Jie Li Peng Cui College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781538629185

The purpose of this paper is to design a practical flux density observer which provides the accurate magnetic flux density signal for the flux feedback control of electromagnet-permanent magnet（EM-PM） hybrid suspension system in maglev ***,the property of two basic kinds of flux observers based on current model and voltage model are *** improve the design of the observed flux density,a practical observer is raised by extracting the low frequency flux density signal from current model and high frequency flux density signal from voltage *** more,based on the analysis of error source of the flux observer,the parameter self-tuning scheme using model reference adaptive system（MRAS） and the track irregularity estimation are applied in it for the purpose of higher *** then,based on the suspension module,the numerical comparisons and related experiments are carried *** show that the raised observer can get satisfied signal for the control in suspension *** the closed loop control system with observed flux feedback can achieve satisfied performance.

关键词： Maglev Flux Density Observer Hybrid Suspension System

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