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Transmission Theory Analysis of a Dynamic Spiral Combination Lifting Mechanism

Energy Procedia 2016年 100卷 526-531页

作者： Faliang Zhou Xiaojun Xu Haoyue Zhang Xiang Zhang College of Mechatronics Engineering and Automation National University of Defense Technology Changsha Hunan China

For traditional screw transmission with long stroke length, the long screw is difficult to be processed, and the original space is large. Aiming at making up the defects, a novel dynamic combination screw transmission mechanism is put forward. The transmission principle, the parameter of extension ratio and meshing conditions of bracing screw and connecting screw are introduced. The carrying capacity is analyzed by simulation. The results show that number of connecting screw is key of parameter ratio and can be adjusted, and the large carrying capacity and accurate positioning meet the special requirement of big trip overloading linear drive applications.

关键词： Lifting Mechanism Transmission Theory Dynamic Combination

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Kalman Tracking Algorithm for Medicine Bottle Capturing in Real-Time Vision

Kalman Tracking Algorithm for Medicine Bottle Capturing in R...

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2016 IEEE Chinese Guidance, Navigation and Control Conference (IEEE CGNCC2016)

作者： Ligang Ge Honglei An Feng Chen Xinhua Li Hongxu Ma College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781467383196

According to measurement error which is brought by collision and extrusion between the bottles and imaging distortion from the camera during the motion of the bottles,we proposed an adaptive measurement covariance of discrete kalman filter *** dynamically adjusting measurement covariance,the method improves the tracking precision of the target motion as the basic condition of *** solution is verified by the *** image acquisition rate of 20frame/s and maximum operating speed more than 0.5 m/s,the algorithm can effectively overcome the influence of measurement noise and data loss ***,the proposed method also can give an excellent tracking result when the moving radius of the bottle is varying.

关键词： Kalman Tracking Algorithm for Medicine Bottle Capturing in Real-Time Vision filter

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Fiber‐in‐Tube Design of Co9S8‐Carbon/Co9S8: Enabling Efficient Sodium Storage

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Angewandte Chemie 2019年第19期131卷

作者： Xiaoyan Li Kaikai Li Sicong Zhu Ke Fan Linlong Lyu Haimin Yao Yiyang Li Jinlian Hu Haitao Huang Yiu‐Wing Mai John B. Goodenough Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong China Department of Mechanical Engineering The Hong Kong Polytechnic University Hong Kong China College of Science and Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong China Centre for Advanced Materials Technology (CAMT) School of Aerospace Mechanical and Mechatronics Engineering J07 The University of Sydney Sydney NSW 2006 Australia Texas Materials Institute and Materials Science and Engineering Program The University of Texas at Austin Austin TX 78712 USA

The sodium‐ion battery is a promising battery technology owing to its low price and high abundance of sodium. However, the sluggish kinetics of sodium ion makes it hard to achieve high‐rate performance, therefore impairing the power density. In this work, a fiber‐in‐tube Co 9 S 8 ‐carbon(C)/Co 9 S 8 is designed with fast sodiation kinetics. The experimental and simulation analysis show that the dominating capacitance mechanism for the high Na‐ion storage performance is due to abundant grain boundaries, three exposed layer interfaces, and carbon wiring in the design. As a result, the fiber‐in‐tube hybrid anode shows a high specific capacity of 616 mAh g −1 after 150 cycles at 0.5 A g −1 . At 1 A g −1 , a capacity of ca. 451 mAh g −1 can be achieved after 500 cycles. More importantly, a high energy density of 779 Wh kg −1 and power density of 7793 W kg −1 can be obtained simultaneously.

关键词： Anoden Co9S8-Kohlenstoff/Co9S8 Korngrenzen Pseudokapazität Natriumionenbatterien

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Sample Capacity for Autonomous Underwater Vehicle Range Accreditation

Sample Capacity for Autonomous Underwater Vehicle Range Accr...

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2016 IEEE International Conference on Big Data Analysis

作者： Xiaojun Guo Shaojing Su Zhiping Huang Yimeng Zhang Chunwu Liu College of Mechatronics Engineering and Automation National University of Defense Technology

In this paper we are interested in the hypothesis test(HT) solution in the presence of prior information and conjugated prior distribution. Truncated Bayesian sequential posterior odd test(SPOT) is introduced to predict the required test sample size in autonomous underwater vehicle(AUV) range accreditation. We focus on the connection between risks(type I and type II) and truncated threshold, required test sample size. And the computational approach based on numerical approaching is given in steps. Supported by prior information after fusion on credibility, we deeply analyzed the effect of risk base value on SPOT performance, and an array of random bootstrapping data is generated to validate the conclusion. A mature solution to small-size-sample test accreditation is proposed in this paper, which provides vital suggestions for test sample size prediction in small-size-sample parameter hypothesis test.

关键词： truncated Bayesian sequential posterior odd test(SPOT) test sample size prediction bootstrap

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Approximate Compressor Based Multiplier Design Methodology for Error-Resilient Digital Signal Processing

Approximate Compressor Based Multiplier Design Methodology f...

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2016 IEEE International Conference on Signal and Image Processing

作者： Zhixi Yang Jun Yang Kefei Xing Guang Yang College of Mechatronics Engineering and Automation National University of Defense Technology

Multiplier is a fundamental component for digital signal processing(DSP) applications and takes up the most part of the resource utilization, namely power and *** circuitry architectures have been studied as innovative paradigm for reducing resource utilization for DSP *** this paper, the 4:2 compressor based approximate multiplier architecture which uses both truncation and approximation of compressor is studied.A greedy selection algorithm is then proposed to identify the Pareto frontier to give the optimal accuracy-power tradeoff.A finite impulse response(FIR) filter is used as an *** architecture proposed in this paper has achieved up to 21.03% and 27.72% saving on power and area for FIR filter case compared to conventional multiplier designs with a decrease of 0.3d B in output SNR.

关键词： compressor multiplier approximate circuit design digital signal processing

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The Underlying Principles of Self-Excited Vibration in Maglev Vehicle-Bridge Coupled System

The Underlying Principles of Self-Excited Vibration in Magle...

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第28届中国控制与决策会议

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

ISBN: (纸本)9781467397155

The maglev stationary self-excited vibration problems degrade the stability of the levitation control,decrease the ride comfort,and restrict the construction cost of maglev *** master the problems,the underlying principles the self-excited vibration are explored from three *** of all,a minimum interaction model containing a flexible bridge and a single levitation unit is *** based on the minimum interaction model,the underlying principle of the self-excited vibration from the energy transmission is *** shows that the active property of the levitation system is the root of self-excited ***,the bridge subsystem is seen as the forward channel and the levitation subsystem is viewed as the feedback channel of the coupled *** this case,the underlying principle of the self-excited vibration from the characteristic polynomial of the coupled system is ***,the stability is explored from the open-loop transfer function,and four conclusions are obtained,which may provide theoretical references for the suppression of maglev stationary self-excited vibration problems.

关键词： Maglev Levitation system Bridge Underlying principle Self-excited vibration

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Analysis of Ground Anchor Stations' Influence on Autonomous Orbit Determination with Distributed Algorithm

Analysis of Ground Anchor Stations' Influence on Autonomous ...

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第七届中国卫星导航学术年会

作者： Fanghong Huang Wende Huang Yueke Wang Yifan Zhou Kui Lin College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9789811009396

The orbit determination of the navigation constellation is the premise for navigation satellite system to realize navigation and position. Autonomous orbit determination based on ground anchor stations can improve the accuracy and survivability of the navigation system, but it has the rotation error. The addition of the ground anchor stations is a valid way to solve the problem. And because of the limited calculation resources on the satellite boards, the algorithm should be a distributed one which however is not the optimal. So it is meaningful to study the influence of the ground anchor stations on the distributed orbit determination algorithm. According to the requirement, first, this article describes the principle of distributed orbit determination algorithm. Second, it analyses the characteristics of it. Third, it studies the effect of ground anchor stations. In the last, it designs a work way in period and test the feasibility of it. The simulation result shows that ground anchor stations can control the rotation error well, but the simple EKF algorithm used to fuse the data of inter-satellite and satellite-to-ground range measurements constricts slow. In the last an improving algorithm is raised.

关键词： Autonomous orbit determination distributed algorithm anchor stations navigation constellation

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Velocity Control for Trotting of A NUDT Quadruped Robot

Velocity Control for Trotting of A NUDT Quadruped Robot

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2016 IEEE Chinese Guidance, Navigation and Control Conference (IEEE CGNCC2016)

作者： Chunyu Chen Honglei An Jian Wang Hongxu Ma Qing Wei College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781467383196

In this paper,we propose a control strategy for the quadruped robot in the trotting *** quadruped robot is simplified as a planar seven-link closed kinematic chain and a LIP(linear inverted pendulum).The quadruped robot can achieve steady locomotion by velocity *** paper designs a method of virtual sliding mode controller for estimation of velocity and applys to the method of velocity *** and experimental results demonstrate the method of control and estimation of velocity as a quadruped robot successfully trotting.

关键词： Section Velocity Control for Trotting of A NUDT Quadruped Robot

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Tracking Loops with Time-Varying Sampling Periods for the TH-CDMA Signal

Tracking Loops with Time-Varying Sampling Periods for the TH...

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2016 IEEE International Conference on Signal and Image Processing

作者： Kai Liu Xiye Guo Jun Yang National University of Defense Technology College of Mechatronics Engineering and Automation

Time-hopping signal structure is adopted for overcoming the near-far problem in the Ground-based Navigation *** signal model of TH-CDMA signal is *** track the pulse signals with pseudorandom active-timeslot, tracking loops with time-varying sampling periods are *** linear model of the second order TVSP-PLL is *** stability of the time-varying model is analyzed based on the First Method of Lyapunov for the linear time-varying system.A transient-response simulation of the second order TVSP-PLL is provided as a *** ranging performance of the TVSP-DLL is evaluated.A hardware experiment and a MATLAB simulation are used to verify the noise performance of the *** tracking loops with time varying sampling periods are implemented on the FPGA platform and *** simulation and experiment results show that the ranging accuracy can achieve centimeter level.

关键词： ground-based navigation system TH-CDMA tracking loops time-varying sampling periods stability

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An Performance Assessment Method for Suspension Control System of Maglev Train

An Performance Assessment Method for Suspension Control Syst...

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第28届中国控制与决策会议

作者： Peichang Yu Jie Li Danfeng Zhou Zhaoyu Guo Junyu Wei College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781467397155

The objective of this study is to investigate a practical performance assessment method for the control system in maglev train based on its operation ***,several features related to performance assessment are extracted with the analysis of the suspension system mathematical *** that the vehicle operation conditions are complex and there are many uncertain disturbances,the assessment process of suspension system performance is studied by using support vector machine and clustering based on operating *** more,experiments are conducted on maglev train CMS04,the suspension system performances are evaluated at different working conditions,and the results proved the correctness of the assessment *** last,to further system improvement,some experiments are carried out for the research of optimal parameters in the ground of results calculated by the raised assessment method.

关键词： Performance Assessment Suspension System Maglev train

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