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Prognostics and system Health Management Conference (PHM-Qingdao)

作者： Xinguang Ma Li Zhan Jie Liu Lin Zhang Jun Liu Mian Zhang Nuclear Power Institute of China Chengdu China Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechanical System Tianjin University of Technology China

Planetary gearboxes are `hearts' of transmission train among heavy industrials. The health condition of planetary gearboxes is the key to maintain reliable operation of industrial and promote harmonious social development. Frequency spectrum analysis of vibration measurements is a popular way for condition assessing. As prior guidance for spectrum analyzing, phenomenological modeling emerges as a simple and effective mathematical description of the vibration measurements referring to the sensor. A reasonable model of a non-faulty planetary gearbox is the essential work, either in understanding the motion behavior, or in condition monitoring and even for fault diagnosis. In this paper, traditional models are reexamined and investigated: we found the contradicting results from two classical references on the selection of fundamental period components when constructing models. The rationality of the traditional models is mathematically and experimentally studied, the more reasonable one is indicated.

关键词： Vibrations Fault diagnosis Analytical models Vibration measurement Frequency measurement Mathematical model Spectral analysis

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design and preliminary experimentation of passive weight-support exoskeleton

Design and preliminary experimentation of passive weight-sup...

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2018 IEEE International Conference on Information and Automation, ICIA 2018

作者： Zhu, Aibin Shen, Zhitao Shen, Huang Song, Jiyuan Key Laboratory of Intelligent Robot of Shaanxi Province Institute of Robotics and Intelligent Systems xi'An Jiaotong University Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'An Jiaotong University Xi'an China

ISBN: (纸本)9781538680698

In view of the fatigue and pain of the leg muscles caused by prolonged standing or squatting work, a passive weight support exoskeleton that assists the body's sitting posture is designed and designed. The exoskeleton accords with the physiological movement characteristics of human body and can follow the walking motion of human body. The multi link mechanism based on redundant rods is designed to avoid the interference between the exoskeleton and the leg during walking by redundant rods, and can guide the body weight to the ground when the wearer sits down. Based on the theoretical calculation of the connecting rod model and the prototype, the feasibility of the scheme is verified. A posture adjustment mechanism is designed to meet the needs of different working conditions. The EMG experiment shows that the exoskeleton design has obvious effect compared with no auxiliary squatting. Our work provides a method, model and experimental verification for solving the fatigue problem of human muscle during squatting work. © 2018 IEEE.

关键词： Muscle

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Finite Element Analysis of Series Elastic Actuator for Exoskeleton Robot Joint

Finite Element Analysis of Series Elastic Actuator for Exosk...

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IEEE International Conference on Mechatronics and Automation

作者： Pengyu Xi Weimin Ge Sen Zhang Zhili Zhang Teresa Zielinska Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Intelligent Manufacturing College Tianjin Sino-German University of Applied Science Tianjin China Institute of Aeronautics and Applied Mechanics Warsaw University of Technology Warsaw Poland

ISBN: (数字)9781728164168

ISBN: (纸本)9781728164175

The finite element simulation for the joints of an exoskeleton robot is conducted in this paper. Using software OpenSim to simulate the normal walking gait of the human body, the motion angle and moment of the human hip, knee and ankle joints are obtained. Using the obtained data as the input parameters in the finite element simulation of the simulation software Ls-dyna, the strain diagrams and contact force curves of the circular roller and cam disk were obtained. In this study, three commonly used materials are selected: alloy steel, ductile iron and hard aluminum alloy. Finally, the effects of different materials on the key components of the series elastic actuator are studied.

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A Method for Multi-HVDC Grouping Based on Spectral Clustering

A Method for Multi-HVDC Grouping Based on Spectral Clusterin...

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IEEE/IAS Industrial and Commercial Power system Asia (I&CPS Asia)

作者： Xiaohui Wang Yu Bai Yadong Gao Dong Liu Yan Zhang Zhidong Wang Feng Gao Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Zhejiang Huayun Electric Power Engineering Design & Consulting Co. Ltd Hangzhou China State Grid Corporation of China (SGCC) State Grid Economic and Technological Research Institute Co. Ltd Beijing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

To satisfy the increasing power demands in load center, multiple HVDCs have been integrated into the receiving grid in China. The reality raises the coordination issues of HVDCs. A HVDC grouping method for optimizing the management of multiple HVDCs is proposed in this paper. Several kinds of relationship in coordination and complementarity between HVDCs are analyzed and quantified. Based on graph theory, HVDC grouping is transformed into a graph-cut problem and solved by spectral clustering algorithm. The proposed method is implemented on a practical multi-HVDC grid, and the results show its feasibility and effectiveness.

关键词： HVDC transmission Voltage control Reactive power Couplings Indexes Clustering algorithms Converters

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Manipulator of robust fuzzy adaptive compensation control 3

Manipulator of robust fuzzy adaptive compensation control

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3rd Asia-Pacific Conference on intelligent Robot systems, ACIRS 2018

作者： Yangjian, Wang Xiaofei, Chen Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineeringline Binshui Xidao 391 Tianjin China

ISBN: (纸本)9781538672266

Dynamics system for reconfigurable manipulator of uncertainty, based on the fuzzy adaptive algorithm is proposed to approach the system control law from adaptation to friction and external disturbance, the compensation control of the reconfigurable robot arm. At the same time in order to improve the control law of compensation precision and anti-interference performance, reduce the approximation error of the algorithm and the robust items added in the control law. By Lyapunov stability theory proves that the proposed fuzzy adaptive robust fuzzy control law and the adaptive control law can be in reconfigurable manipulator dynamics contained in friction and the external disturbance to ensure the stability of the system. Last three do f reconfigurable robot arm as an example to design a reconfigurable robotic arm controller, the simulation results show that the algorithm has good trajectory tracking performance, and proves the feasibility and effectiveness of the algorithm. © 2018 IEEE.

关键词： Friction

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Capacity improvement for mixed traffic flow by installing vehicle-to-vehicle devices on partial human-driven vehicles to serve connected automated vehicles

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Physica A: Statistical Mechanics and its Applications 2025年 674卷

作者： Yan Wang Yanyan Qin Zhongbin Luo Hao Wang Chongqing Key Laboratory of Intelligent Integrated and Multidimensional Transportation System Chongqing Jiaotong University Chongqing 400074 China School of Traffic and Transportation Chongqing Jiaotong University Chongqing 400074 China College of Computer Science Chongqing University Chongqing 400044 China China Merchants Chongqing Communications Reseach & Design Institute Co. Ltd. Chongqing 400067 China Transportation Industry R&D Center for Autonomous Driving Technology Chongqing 400067 China Jiangsu Key Laboratory of Urban ITS Southeast University Nanjing 211189 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Nanjing 211189 China School of Transportation Southeast University Nanjing 211189 China

Vehicle-to-vehicle (V2V) communication technology in connected automated vehicles (CAVs) substantially improves traffic capacity. During initial CAV deployment phases, mixed traffic flow combining CAVs and human-driven vehicles (HVs) will inevitably co-exist on highways. The absence of V2V capabilities in HVs prevents them from providing V2V services to CAVs, thereby constraining CAVs’ capacity improvement in mixed traffic environments. To address this limitation, we propose equipping partial HVs with V2V communication devices, enabling these retrofitted HVs to transmit V2V information and create essential communication environment for CAVs. This study develops a mixed traffic capacity analysis framework that simultaneously incorporates CAV penetration rate and V2V installation rate of HVs, which aims to improve mixed traffic capacity by adjusting the V2V installation rate of HVs. Firstly, we classified car-following patterns within mixed traffic flow and calculate their probabilities. Secondly, a mixed traffic capacity model was constructed using fundamental diagram theory. Using the established model, critical values for V2V installation rate of HVs were analytically derived to achieve capacity improvements under varying CAV penetration rates. Finally, numerical experiments validated both the model’s reliability and theoretical derivations. Results demonstrate that the proposed model effectively quantifies how CAV penetration rate and V2V installation rate of HVs jointly influence mixed traffic capacity. Strategic adjustment of V2V installation rate of HVs based on each level of CAV penetration rates significantly enhances mixed traffic capacity.

关键词： Capacity modeling Connected automated vehicles Mixed traffic flow Vehicle-to-vehicle devices

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Research on Stress-Relaxation Property of Different Layers ment under Compression 16

Research on Stress-Relaxation Property of Different Layers m...

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16th IEEE International Conference on Mechatronics and Automation, ICMA 2019

作者： Zhou, Jinlai Song, Yang Shi, Xue Xu, Chenguang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China Periodontitis Department Tianjin Stomatological Hospital Tianjin300041 China

ISBN: (纸本)9781728116983

As a connective tissue connecting teeth and alveolar bone, periodontal ligament (PDL) has the mechanical properties of nonlinearity, viscoelasticity, anisotropy. In this paper, the pig mandibular central incisors were taken as subjects, a loading machine(CARE-MI00) was used to perform compression tests and the PDL stress-relaxation characteristics under different strain conditions were obtained. The stress-time curves and the relaxation modulus curves were obtained. The three-parameters Zener model and five-parameter generalized Maxwell model proposed by the author were used to fit the data. The experimental results show that the elastic modulus of PDL decreases gradually in the apex(ranges from 2.64 to 3.06 MPa), cervical margin(ranges from 1.44 to 1.76 MPa) and midroot (ranges from 1.03 to 1. 06MPa). Zener model has a relatively high fitting degree, and the squared correction coefficient is about 0.98, however, the adjusted R square of the five-parameter model was above 0.99. Compared with the Zener model, the five-parameter model can better reflect the sudden drop of relaxation modulus at the initial stage, which is more suitable for describing stress-relaxation in viscoelastic behavior of PDL. The advantage of this paper is to compare the descriptive ability of three-parameter and five-parameter generalized Maxwell equation to the mechanical properties of PDL and to provide an effective procedure for the preparation of PDL specimens. © 2019 IEEE.

关键词： Elastic moduli

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Unleashing the Power of Edge-Cloud Generative AI in Mobile Networks: A Survey of AIGC Services

arXiv

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arXiv 2023年

作者： Xu, Minrui Du, Hongyang Niyato, Dusit Kang, Jiawen Xiong, Zehui Mao, Shiwen Han, Zhu Jamalipour, Abbas Kim, Dong In Shen, Xuemin Leung, Victor C.M. Poor, H. Vincent The School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore The School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China The Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore The Department of Electrical and Computer Engineering Auburn University AuburnAL36849-5201 United States The Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States The Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of The School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia The Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of The Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada The College of Computer Science and Software Engineering Shenzhen University Shenzhen518061 China The Department of Electrical and Computer Engineering The University of British Columbia VancouverBCV6T 1Z4 Canada The Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States

Artificial Intelligence-Generated Content (AIGC) is an automated method for generating, manipulating, and modifying valuable and diverse data using AI algorithms creatively. This survey paper focuses on the deployment of AIGC applications, e.g., ChatGPT and Dall-E, at mobile edge networks, namely mobile AIGC networks, that provide personalized and customized AIGC services in real time while maintaining user privacy. We begin by introducing the background and fundamentals of generative models and the lifecycle of AIGC services at mobile AIGC networks, which includes data collection, training, fine-tuning, inference, and product management. We then discuss the collaborative cloud-edge-mobile infrastructure and technologies required to support AIGC services and enable users to access AIGC at mobile edge networks. Furthermore, we explore AIGC-driven creative applications and use cases for mobile AIGC networks. Additionally, we discuss the implementation, security, and privacy challenges of deploying mobile AIGC networks. Finally, we highlight some future research directions and open issues for the full realization of mobile AIGC networks. © 2023, CC BY.

关键词： Life cycle

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Unraveling anisotropic corrosion behaviors of CoCrMo biomedical alloy fabricated by laser powder bed fusion: Microstructure heterogeneity insights

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Journal of Alloys and Compounds 2025年 1036卷

作者： Li Zhang Jian Tu Yingrui Liu Xingqun Zhang Li Yang Yanxiang Liang Yanbin Du Jinru Luo Shuqian Fan College of Material Science and Engineering Chongqing University of Technology Chongqing 400054 PR China Chongqing Materials Research Institute Co. Ltd Chongqing 400707 PR China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 PR China State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu 610031 PR China Chongqing Key Laboratory of Manufacturing Equipment Mechanism Design and Control Chongqing Technology and Business University Chongqing 400067 PR China Department of Ferrous Metallurgy University of Science and Technology Beijing Beijing 100083 PR China JITRI Advanced Materials R&D Co. Ltd. Yangtze Delta Suzhou 215133 PR China

CoCrMo biomedical alloys are extensively used in medical implants for their superior biocompatibility and mechanical properties. The present study investigates the relationship between microstructure and corrosion behavior on the building surface (XY-plane) and side surface (YZ-plane) of CoCrMo alloys fabricated by laser powder bed fusion (LPBF). Comprehensive electrochemical tests revealed significant anisotropy in corrosion behavior between the XY and YZ planes due to the microstructure heterogeneity. In the XY-plane, finer grain sizes, higher dislocation densities, longer sub-grain boundaries, and a more extensive distribution of inclusions facilitate the formation and stability of a dense protective film, effectively preventing the intrusion of corrosive media. In contrast, the YZ-plane, characterized by a higher density of melt pool boundaries (MPBs), demonstrated pronounced selective corrosion, particularly within the sub-grain regions and along the MPBs. These insights can guide the optimization of manufacturing processes to enhance corrosion resistance, thereby improving the performance and safety of medical implants by reducing the risk of implant failure due to corrosion-related issues.

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Two methods of determining target orientation by robot visual principle

Two methods of determining target orientation by robot visua...

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作者： Liu, Gang School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory of Advanced Mechanical and Electrical System Design and Intelligent Control Tianjin300384 China

ISBN: (纸本)9781538636749

By analyzing the imaging principle of the fish-eye lens in the robot vision, two methods of determination of the target orientation based on the fish-eye lens are summarized. One method uses the distortion correction to determine the target orientation, and the other uses the relationship between the target in the actual orientation and its correspondence in the imaging coordinates to determine the target orientation, both methods all use image processing technology, fast and efficiently determine the orientation of the target in the fish eye image. In this paper, the theoretical basis and experimental process of the two methods are introduced respectively. By comparing the data after the experiment, the more accurate method is analyzed and applied to the target azimuth determination of the fish-eye lens. © 2017 IEEE.

关键词： Fish-eye lens Image processing Robot vision Target orientation

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