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arXiv 2020年

作者： Liu, Teng Yang, Xing Wang, Hong Tang, Xiaolin Chen, Long Yu, Huilong Wang, Fei-Yue State Key Laboratory of Mechanical Transmissions College of Automotive Engineering Chongqing University Chongqing400044 China Department of Mechanical and Aerospace Engineering Nanyang Technological University Singapore School of Vehicle and Mobility Tsinghua University Beijing China Waytous Inc. Qingdao Shandong266109 China Department of Mechanical and Mechatronics Engineering University of Waterloo N2L 3G1 Canada State Key Laboratory for Management and Control of Complex System Institute of Automation Beijing China

Digital quadruplets aiming to improve road safety, traffic efficiency and driving cooperation for future connected automated vehicles are proposed with the enlightenment of ACP based parallel driving. The ACP method denotes Artificial societies, Computational experiments and Parallel execution modules for cyber-physical-social systems. Four agents are designed in the framework of digital quadruplets: descriptive vehicles, predictive vehicles, prescriptive vehicles and real vehicles. The three virtual vehicles (descriptive, predictive, and prescriptive) dynamically interact with the real one in order to enhance the safety and performance of the real vehicle. The details of the three virtual vehicles in the digital quadruplets are described. Then, the interactions between the virtual and real vehicles are presented. The experimental results of the digital quadruplets demonstrate the effectiveness of the proposed framework. Copyright © 2020, The Authors. All rights reserved.

关键词： Vehicles

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Ultra-Sensitive Force Transduction in Weakly Coupled Resonators

Ultra-Sensitive Force Transduction in Weakly Coupled Resonat...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Hemin Zhang Milind Pandit Jiangkun Sun Dongyang Chen Guillermo Sobreviela Chun Zhao Ashwin Seshia University of Cambridge Cambridge United Kingdom College of Mechatronics Engineering and Automation National University of Defense Technology Changsha People's Republic of China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou People's Republic of China MOE Key Laboratory of Fundamental Physical Quantities Measurement Huazhong University of Science and Technology Wuhan People's Republic of China

ISBN: (数字)9781728135816

ISBN: (纸本)9781728135823

This paper, for the first time, reports on a transducer configuration employing weakly coupled resonators demonstrating significant modal overlap. Existing multimode/mode-localized sensors conventionally operate in a regime where modal overlap is negligible; however, theoretically, the sensitivity of such systems significantly increases as the coupling strength between resonators is reduced, moving the system to a regime described by modal overlap. In this work, operation in the modal overlap regime is made possible with consequent benefits in input-referred resolution and stability. Specifically, a coupled resonator microsystem subject to electrostatic stiffness perturbations shows a sensitivity enhancement of 33682 and an input-referred amplitude ratio stability of 28.2ppb, demonstrating a ~3x improvement in resolution compared to the resonant frequency shift technique.

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Event-triggered encirclement control of multi-agent systems with bearing rigidity

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Science China(Information Sciences) 2017年第11期60卷 91-108页

作者： Yangguang YU Zhiwen ZENG Zhongkui LI Xiangke WANG Lincheng SHEN College of Mechatronics & Automation National University of Defense Technology State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Aerospace EngineeringCollege of Engineering Peking University

In recent years, the problem of multi-agent encirclement has attained much attention and was extensively studied. However, few work consider the factor that the on-board calculation as well as the communication capacity in the multi-agent system is limited. We investigate the encirclement control by employing the newly developed bearing rigidity theory and event-triggered mechanism. Firstly, in order to reduce the onboard loads,the event-triggered mechanism is considered in the framework and further an event-triggered control law based on bearing rigidity is proposed. The input-to-state stability(ISS) of networked agents is also analyzed by using the Lyapunov method and the cyclic-small-gain theory. In addition, the lower bound for the inter-event times is provided. Finally, to verify the efficiency and feasibility of the proposed encirclement control law, numerical experiments are investigated.

关键词： encirclement control event-triggered multi-agent system bearing rigidity

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Design and Performance Analysis of a New Environmental Energy Powered Marine Vehicle 5

Design and Performance Analysis of a New Environmental Energ...

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2018 5th International Conference on Advanced Composite Materials and Manufacturing engineering, ACMME 2018

作者： Sun, Chongfei Shang, Jianzhong Luo, Zirong Lu, Zhongyue Zhu, Yiming Wu, Guoheng College of Mechatronics and Automation National University of Defense Technology Changsha410073 China School of Mechanical Aerospace and Civil Engineering University of Manchester ManchesterM17JR United Kingdom

The efficient and reliable marine vehicle is an important tool to develop marine resources, and the lack of reliable power supply methods is one of the important issues that restrict the development of marine vehicle. This paper designs a new type of marine vehicle that can use environmental energy to absorb wave energy and convert it into electricity. The generated electric energy is temporarily stored in a battery or directly supplied to its own equipment. This article describes the main structure of the new marine vehicle and focuses on the energy module of the vehicle. And the energy module has been analysed and optimized. In this paper, the influence of the blade angle on the performance characteristics of the energy module is numerically analysed, and its variation law which lays a foundation for further structural optimization is obtained. © 2018 Published under licence by IOP Publishing Ltd.

关键词： Electric power systems

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Landing Condition Analysis of a Loss-of-thrust UAV Based on Adjoint Method 29

Landing Condition Analysis of a Loss-of-thrust UAV Based on ...

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第29届中国控制与决策会议

作者： Zhang Maohua Ma Jianjun Zheng Zhiqiang College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509046584

A loss-of-thrust UAV(unmanned aerial vehicle) needs to land to a predetermined area,which not only requires a higher accuracy of landing area,but also needs to maintain a certain attitude *** this paper,the Schwartz inequality and state space form are used to derive the guidance law with angle *** influence of heading error and angle constraint on aircraft landing area are analyzed quantitatively based on the adjoint *** simulations show the range of the heading error and angle constraint on the condition of certain miss *** with traditional Monte-Carlo method,the method of adjoint in this paper has the advantages of small computation and simple data processing.

关键词： UAV Schwartz inequality heading error adjoint method

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Response and control of a levitation module under track irregularities when the maglev train is traveling 29

Response and control of a levitation module under track irre...

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第29届中国控制与决策会议

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

ISBN: (纸本)9781509046584

The EMS(Electro-Magnetic Suspension) maglev train uses attractive magnetic forces to neutralize its weight, which puts a rather high requirement on the smoothness of the track since the levitation gap is generally 80 mm. It has been observed that in a traveling urban maglev train, the levitation gap error of the rear levitation unit in a levitation module is generally more prominent than that of the front levitation units;and under poor track conditions, the rear electromagnet of the levitation unit is more likely to clash with the track and to cause a levitation failure. However, this phenomenon has not yet been well interpreted. In this paper, a model of the levitation module in a maglev train is built to study the responses of the levitation gaps under different vehicle speed and track conditions, and results show that the levitation module is sensitive to some specified wavelengths of the track irregularities, and the analysis well interprets the reason that causes the difference of the response for the front and the rear levitation unit under track irregularities. A control strategy is also proposed to reduce the rear gap fluctuation.

关键词： Maglev Track irregularity Levitation Module

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Analysis of Wave Energy and Energy Storage Characteristics of Wave Energy Converters 5

Analysis of Wave Energy and Energy Storage Characteristics o...

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2018 5th International Conference on Advanced Composite Materials and Manufacturing engineering, ACMME 2018

作者： Sun, Chongfei Luo, Zirong Shang, Jianzhong Lu, Zhongyue Zhu, Yiming Wu, Guoheng College of Mechatronics and Automation National University of Defense Technology Changsha410073 China School of Mechanical Aerospace and Civil Engineering University of Manchester ManchesterM17JR United Kingdom

With the development of wave energy extraction technology, the performance requirements of wave energy converters have also become higher in order to maximize operating efficiency and the use of wave energy. In this paper, the wave energy characteristics and energy storage characteristics of current common wave energy converters are studied for this demand. Because small-scale wave energy convertors are characterized by their strong mobility and relatively lower power generation, it is not easy to integrate the generated energy directly into the power grid. Therefore, a small, highly efficient and environmentally friendly storage method is needed. Through investigation, the lithium battery pack is used to store the energy output from the convertors by means of a filtered regulated charging circuit. © Published under licence by IOP Publishing Ltd.

关键词： Lithium batteries

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Investigation of flow characteristics in helical separator 3

Investigation of flow characteristics in helical separator

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2018 3rd International Conference on Insulating Materials, Material Application and Electrical engineering, IMMAEE 2018

作者： Zhou, Chuangchuang Guo, Hua Sang, Xiaohu Zhou, Xiaojun School of Mechatronics Engineering and Automation Shanghai University Shanghai20007 China Shanghai Technical Institute of Electronics and Information Shanghai201411 China College of Information and Mechanical and Electrical Engineering Ningde Normal University Ningde352100 China

The oil recovery technology of submersible electric pump has the advantages of multi-function and strong adaptability, which has become one of the important lifting methods at present. High gas-liquid ratio and low downhole pressure in oil well will lead to a large amount of natural gas in crude oil. Cavitation and air lock will shorten the pump operation cycle. Therefore, a gas separator is installed at the inlet of the pump to separate the gas from the well fluid, reducing the volume fraction of the gas entering the pump and improving the production efficiency of the pump. In this study, the flow passage of the helical separator is treated as an equal-section pipeline in the research process. Through theoretical analysis and numerical simulation, the separation efficiency and pressure loss in the helical separator are studied and the expression of the total liquid phase drag multiplier applicable to the separator structure is obtained by the method of fitting. © 2018 Published under licence by IOP Publishing Ltd.

关键词： Separators

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A Robust NF-GMMCP algorithm for Multi-Pedestrian Tracking 2

A Robust NF-GMMCP algorithm for Multi-Pedestrian Tracking

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

作者： Huimin Chen Xingwei Li Yongbin Zheng Nan Chen College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509064151;9781509064144

In this paper, we proposed a novel NF-GMMCP algorithm for Multi-Pedestrian Tracking(MPT) problems, which implements data association in video sequences by connecting network flows(NF) and maximum generalized multi-group algorithm(GMMCP). In the case where the detection set of the video sequence is given, the first step is to generate the pre-level tracklets by using dynamic programming(DP) algorithms to compute shortest paths in the NF problems. Secondly, to find the middle-level tracklets by using CPLEX toolkit to solve the Mixed Binary-Integer Program(MBIP) problem of GMMCP algorithm. Finally, we selected a simple threshold determination model to create final trajectories. CLEAR MOT metrics are used to evaluate our model performance. The experimental results on three challenging video sequences show that our method is able to obtain the superior performance under the compare with recently several state-of-the-art methods.

关键词： NF-GMMCP GMMCP VMOT MPT NF

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Maintenance Decision Based on Probabilistic Risk Assessment for Maglev Train Braking System 36

Maintenance Decision Based on Probabilistic Risk Assessment ...

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第36届中国控制会议

作者： Chengxin Fan Zhiqiang Long Fengshan Dou College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781538629185

Maglev train is a new type of green environmental protection urban rail *** security and reliability are the key issues which must be considered in the future *** this paper,the working principle of the braking system in maglev train is comprehensively *** analyzing the characteristics of the braking system,the fault tree（FT） is employed to establish the fault model of braking *** on this fault model,the potential source of risk is easily *** ranking the values of different importance,the weak links of the key components which lead to the failure of the braking system are *** score of each risk factor is obtained by weighted sum of the result of comprehensive risk *** results of probabilistic risk assessment provide an important basis of the subsequent fault diagnosis and maintenance:the resources can be effectively allocated to the main risk factors to optimize the maintenance decision for maglev train.

关键词： maglev train braking system probabilistic risk assessment fault tree

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