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High-Precision Wide-Range Current Transformer Based on Compensation Algorithm

High-Precision Wide-Range Current Transformer Based on Compe...

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2023 IEEE International Conference on Advanced Power System Automation and Protection, APAP 2023

作者： Xu, Yuefei Wu, Qinghua Ye, Minghao Wen, Jingmao Ma, Jiaqing Zheng, Taiying Hangzhou Electric Power Equipment Manufacturing Co. Ltd Hangzhou China Polytechnic Institute Zhejiang University Zhejiang Provincial Key Laboratory of Electrical Machine Systems Hangzhou China Zhejiang University College of Electrical Engineering Zhejiang Provincial Key Laboratory of Electrical Machine Systems Hangzhou China PowerChina Huadong Engineering Co. Ltd Hangzhou China School of Electrical Engineering Guizhou University Guiyang China

ISBN: (纸本)9798350306668

Current transformers (CTs) are critical devices in power systems, and their measurement accuracy directly affects the safety and stability of the power grid. This paper proposes a compensation algorithm for CTs to enhance measurement precision effectively. Firstly, offline measurements of the primary and secondary side currents and the magnetic flux of the CT under different operational conditions are conducted. A model of the magnetic flux versus excitation current curve is fitted from this. With the help of this fitted model, during online measurements, the excitation current is obtained from the magnetic flux, which is then used to compensate for the secondary current. To verify the performance of the proposed method, this paper conducted validations through simulations and physical experiments. In EMTP-RV, simulations were conducted based on the data from actual 10P10-rated protection CTs, choosing several known and unknown operating conditions. A physical experimental platform was set up for compensation experiments on closed and open-type 10P10 protection CTs. Both simulation and physical experimental results indicate that the proposed method can effectively enhance the measurement accuracy of wide-range CTs, validating the feasibility of high-precision wide-range CTs. © 2023 IEEE.

关键词： Electric instrument transformers

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Toward Improving the Performance of Hand Movement Intention Recognition for Upper Limb Amputees Using Flexible Ultrasound Transducers 17

Toward Improving the Performance of Hand Movement Intention ...

引用

17th International Convention on Rehabilitation engineering and Assistive Technology, i-CREATe 2024

作者： Peng, Xinhao Oyemakinde, Tolulope Tofunmi Wang, Mengtao Zhao, Hang Tian, Lan Zheng, Yue Guo, Yao Ma, Teng Liu, Zhiyuan Li, Guanglin Li, Xiangxin Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Cas Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen518055 China Shenzhen People's Hospital China Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China

ISBN: (纸本)9798350355154

In recent years, with the development of ultrasonic sensing technology, ultrasound is considered as a promising alternative to surface electromyography for the recognition of human hand movements. However, the existing ultrasound transducer is bulky and poor wearability, and the performance of ultrasound based motion recognition for amputees was not comprehensively investigated yet. So, in this study, we used a wearable, flexible and lightweight B-mode ultrasound probe to detect the morphological change of muscles of 24 fine hand movements for four subjects. In order to develop an effective B-mode ultrasound based motion recognition method, the performances of five kinds of image features and three kinds of classification algorithms were systematically investigated. And the results showed that the combination of HOG+SVM had the highest average recognition accuracy of 97.84% and the combination of Sobel+SVM was the most robust to individual difference. The work of this study may provide help for the application of muscle ultrasound image based motion recognition. © 2024 IEEE.

关键词： Ultrasonic transducers

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A Pilot Study on Coupling Behaviors of Limb Movements and Brain Activation Based on EEG and fNIRS Synchronization Information

A Pilot Study on Coupling Behaviors of Limb Movements and Br...

引用

2023 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2023

作者： Tang, Xi Li, Qingge Tang, Yao Tian, Lan Zheng, Yue Li, Xiangxin Jiang, Naifu Shang, Peng Li, Guanglin Peng, Liang Fang, Peng Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Cas Key Laboratory of Human-Machine Intelligence-Synergy Systems The Shenzhen Engineering Laboratory of Neural Rehabilitation Technology Shenzhen518055 China University of Chinese Academy of Sciences Shenzhen College of Advanced Technology Shenzhen518055 China Chinese Academy of Sciences State Key Laboratory of Management and Control for Complex Systems Institute of Automation Beijing100190 China

ISBN: (纸本)9798350327182

Motion is one of the basic physiological functions of human beings. However, many brain diseases such as stroke may cause different degrees of motor dysfunctions for patients. As a commonly used rehabilitation method, active and passive exercise training may enhance patients' neuromuscular functions and recover their motor abilities. It is known that limb movements are strongly coupled with brain activation but there is currently insufficient exploration on the coupling behaviors from the perspective of informatics. In this study, the coupling relationship between limb movements and brain activation was preliminarily studied based on three healthy subjects. Electroencephalogram (EEG) and functional near-infrared spectroscopy (fNIRS) signals were synchronously collected during lower limb movements, and time-frequency analysis (TFA) and transfer entropy (TE) analysis were performed to quantitatively study the brain activation behaviors. In the experiments, a desynchronization phenomenon of μ rhythm in EEG was observed during exercise states, and the experimental results demonstrate the activation rule of motor and prefrontal cortexes upon limb movements. Calculations show that there exists a bidirectional flow of information between EEG and cerebral oxygen metabolism signals, but with a difference between different directions. This work may support the rehabilitation for patients with motor dysfunctions with a guidance of quantitative indicators and also benefit the exploration on neuroscience. © 2023 IEEE.

关键词： Electroencephalography

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Design of a Mesh Crawling Robot with Beetle-Inspired Variable Stiffness Tarsus

Design of a Mesh Crawling Robot with Beetle-Inspired Variabl...

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2024 IEEE International Conference on Robotics and Biomimetics, ROBIO 2024

作者： Chen, Hao Hu, Kai Hu, Longlong Zhou, Ziqi Li, Yao Li, Bing Key University Laboratory of Mechanism & Machine Theory and Intelligent Unmanned Systems of Guangdong Guangdong Provincial Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics Shenzhen518055 China School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781665481090

Compared with large robots, micro-robots have the advantages of small size, low power consumption, and high concealment. For complex terrain, the crawling performance of micro-robots will be significantly reduced. In this study, the mesh surface was used as the crawling base of the robot, and a variable stiffness tarsus was designed with the beetle as a reference. This tarsus composed of multiple bending parts achieves a large range of stiffness changes, 0.070.495 N/mm. We have achieved stiffness control of the tarsus in a single actuation by trajectory planning of the claw ends. The proposed robot can achieve a big stiffness of the tarsus to resist the deformation of the tarsus due to external forces, which means that the robot can increase the adhesion ability when crawling at the stance phase. Therefore, even when the load was increased from 10g to 40g, the average crawling speed of the robot was not significantly reduced. This new tarsus can improve the crawling performance of the micro-robot on the mesh. © 2024 IEEE.

关键词： Microrobots

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A Systematic Review and Meta-Analysis of Older Adults’ Cognitive Impairments and Effects on Road Safety 68th

A Systematic Review and Meta-Analysis of Older Adults’ Cogn...

引用

68th International Annual Meeting of the human Factors and Ergonomics Society, HFES 2024

作者： Zhang, Yunru Zhu, Wenchao Xiao, Yan Kramer, Arthur F. Lin, Yingzi Intelligent Human-Machine Systems Laboratory Mechanical and Industrial Engineering Department Northeastern University BostonMA United States College of Nursing and Health Innovation University of Texas at Arlington TX United States Center for Cognitive & Brain Health Center Psychology Department Northeastern University BostonMA United States

Driving is challenging for older adults, especially those with cognitive impairments. This paper systematically reviewed 39 peer-reviewed studies to examine the impact of cognitive deficits on older adults’ driving abilities, focusing on the discussion of neuropsychological assessments including Trail Making Tests, Useful Field of View, Maze Test, and Mini-Mental Status Exam. The study proposed the concept of Road Safety Cognitive Health, which encompasses the cognitive processes crucial for safe driving, aiming to inform future driver training, licensing regulations, roadway designs, and vehicle technology innovations. Concussively, this research advances understanding of road safety challenges for cognitively impaired older adults and advocates for an integrative approach to ensure their driving safety. © 2024 human Factors and Ergonomics Society.

关键词： Ergonomics

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An Objective Pain Measurement machine Learning Model through Facial Expressions and Physiological Signals

An Objective Pain Measurement Machine Learning Model through...

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International Conference on Mechatronics and machine Vision in Practice (M2VIP)

作者： Jianan Zheng Yingzi Lin Intelligent Human Machine Systems Laboratory Mechanical and Industrial Engineering Northeastern University Boston USA Department of Mechanical and Industrial Engineering Intelligent Human Machine Systems Laboratory Northeastern University

ISBN: (纸本)9798350334340

The widely used technique for measuring patient pain in modern medicine is based on patients' self-reported pain. Since each human body experiences pain differently and has its own distinct pain threshold, it is very difficult for professionals to objectively evaluate a patient's level of pain based on their own description. In order for pain management treatments and prescribed therapy to be efficient and effective, a precise evaluation of pain is crucial. This study developed an objective pain measurement model based on machine learning algorithms and an open-source BioVid heat pain database. More specifically, the properties of skin conductance at various pain thresholds were examined. Electrocardiogram (ECG) and facial expression data were also assessed for performance. The study's findings demonstrate that both facial expression-based and ECG-based models can detect whether a patient is in pain. The physiological response of the subject can be utilized as a nonverbal test to gauge the patient's level of discomfort. The ECG-based model is more precise than the one based on facial expressions because we are able to gather more data with the former, therefore improving the model's accuracy, by increasing the period of the pain stimulation and the number of participants.

关键词： Pain Databases Biological system modeling Sociology Electrocardiography Physiology Data models

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Microscopic Modeling of Traffic through an Intersection via a Hybrid System with Recursive Links 15

Microscopic Modeling of Traffic through an Intersection via ...

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15th International Conference Management of Large-Scale System Development, MLSD 2022

作者： Valuev, Andrey M. Mechanical Engineering Research Institute Named after A.A.Blagonravov of Ras Laboratory of Dynamics of Man-Machine Systems Moscow Russia

ISBN: (数字)9781665497015

ISBN: (纸本)9781665497015

A general model for the safe and correct traffic through a regulated intersection with a given road organization is introduced. The model is concretized based on a given correct car-following model extended to all possible situations when passing through an intersection. A recursive method for calculating a set of vehicles' trajectories is described. © 2022 IEEE.

关键词： Hybrid systems

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Options for Regulating Traffic Flows at Intersections and Some Ways to Choose Them 15

Options for Regulating Traffic Flows at Intersections and So...

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15th International Conference Management of Large-Scale System Development, MLSD 2022

作者： Solovyev, Anatoliy A. Valuev, Andrey M. Mechanical Engineering Research Institute Named after A.A.Blagonravov of Ras Laboratory of Dynamics of Man-Machine Systems Moscow Russia

ISBN: (数字)9781665497015

ISBN: (纸本)9781665497015

The method of controlling an intersection by jointly choosing a phase-wise traffic separation scheme and optimizing traffic light control at the required intensity of traffic flows along the directions of movement is being developed, taking into account the interaction of clusters on exit roads. The sequence of passage schemes on phases and temporal phase shifts for individual routes are optimized. © 2022 IEEE.

关键词： Roads Traffic control Conference management Large-scale systems Vehicle dynamics Task analysis

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Investigation of Electromagnetic Forces under Stator and Rotor Reference Frames in PMSM 5

Investigation of Electromagnetic Forces under Stator and Rot...

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5th IEEE Student Conference on Electric machines and systems, SCEMS 2022

作者： Yao, Lei Wang, Yunchong Qin, Xue-Fei Yu, Fengyuan Zhang, Youhao Shen, Jian-Xin Zhejiang University College of Electrical Engineering Hangzhou China Zhejiang Provincial Key Laboratory of Electrical Machine Systems Hangzhou China

ISBN: (数字)9781665476898

ISBN: (纸本)9781665476898

The electromagnetic vibration and torque ripple are crucial to the NVH performance of permanent magnet synchronous motor (PMSM). In this paper, take a motor with 9 slots and 6 poles as an example, the spatial and temporal orders of the force harmonics under the stator stationary reference frame and rotor rotating reference frame are derived. Both the theoretical analysis and the finite element method (FEM) demonstrate the differences between the force harmonic characteristics under the two reference frames. Then the radial and tangential vibrations on the stator and rotor are simulated and compared. The orders of force harmonics dominantly causing vibration and torque ripple are identified, respectively. The force harmonics, vibration and torque ripple are compared with motors before and after torque optimization as examples, and the intrinsic relation among them is revealed accordingly to give recommendations for optimization. © 2022 IEEE.

关键词： Stators

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High-performance Optical Surfaces Polishing Technology and machine Tools 4

High-performance Optical Surfaces Polishing Technology and M...

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Advanced Optical Manufacturing Technologies and Applications 2024, AOMTA 2024 and 4th International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2024

作者： Wu, Dongxu Li, Baozhen Li, Yunfei Peng, Yunfeng Sun, Lin GENERTEC Machine Tool Engineering Research Institute CO. LTD Beijing100102 China Department of Mechanical and Electrical Engineering Xiamen University Xiamen361005 China State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies Xi'an Jiaotong University Shaanxi 710049 China

ISBN: (数字)9781510683037

ISBN: (纸本)9781510683020

High-performance optical surfaces are crucial in advanced optics as they ensure the performance and longevity of essential devices. Achieving high-performance optical surfaces involves strict contour control requirements and demanding machining accuracy standards. The capability to manufacture these surfaces depends on advancements in manufacturing processes and machine tool equipment for difficult-to-machine optical materials. In the manufacturing process of high-performance optical surfaces, polishing technology and machine tools play a central role. This includes critical polishing technologies and related machine tools such as CCOS small grinding head polishing, bonnet polishing, and magnetorheological finishing. These technologies have unique polishing mechanisms, processing characteristics, and deep academic and application backgrounds. The current status and progress of research by optical manufacturers and scholars and the associated problems and risks of different polishing techniques and equipment in processing high-performance optical mirrors are discussed. To meet the extreme manufacturing accuracy requirements of optical components in the future, technical challenges and development directions are pointed out. Developing new polishing machine tools and equipment is necessary to meet the ever-increasing precision requirements of optical surfaces. This will promote the development of high-performance optical surface manufacturing technology to achieve extreme precision, higher efficiency, and a more comprehensive range of applications. © 2024 SPIE.

关键词： Polishing machines

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