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Broadband electrical Impedance Matching of Sandwiched Piezoelectric Ultrasonic Transducers for Structural Health Monitoring of the Rail In-Service

SSRN

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SSRN 2023年

作者： Yang, Yahui Wei, Xiaoyuan Yao, Wenqing Lan, Jianping Institute of Automotive Engineers Hubei University of Automotive Technology Shiyan442002 China Department of Electrical and Information Engineering Lanzhou University of Technology Lanzhou730050 China Key Laboratory of Gansu Advanced Control for Industrial Processes Lanzhou University of Technology Lanzhou730050 China Faculty of Automation and Information Engineering Xi’an University of Technology Xi’an710048 China

To achieve high power transmission efficiency and high signal-to-noise ratio of sandwiched piezoelectric ultrasonic transducers (SPUTs) over a wide bandwidth, broadband electrical impedance matching (EIM) is investigated in-depth. Firstly, L type, T type, III type, IV type and V type EIM networks are designed and the corresponding component parameters are determined by the Smith chart with a quality factor Q constraint. Secondly, the above EIM networks are compared by reflection coefficient S11, transducer power gain (TPG) and active power. It is shown that they can effectively improve the TPG, and active power by two times and greatly reduce S11. Then the emitted voltage and received voltage under different excitation frequencies and EIM networks are analyzed. It is shown that the III type network presents optimal performance, which can make the aforementioned voltage values increase by two times over entire frequency range of interest. Finally, the effect of III type and IV type networks on electromechanical characteristics is studied by using the PSpice model of SPUTs. Compared to non-matching, the electro-acoustical gain ratio is improved almost two times, while the electro-acoustical power ratio is greatly reduced. © 2023, The Authors. All rights reserved.

关键词： Ultrasonic transducers

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Lessons learned from human lava tube exploration and research during simulated lunar and Martian missions at the HI-SEAS space research station 24

Lessons learned from human lava tube exploration and researc...

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24th IAA Symposium on Human Exploration of the Solar System 2021 at the 72nd International Astronautical Congress, IAC 2021

作者： Musilova, Michaela McAdam, Amy Seto, Emily P. Bower, Dina Millan, Maëva Fishman, Chloe International MoonBase Alliance United States Institute of Robotics and Cybernetics Faculty of Electrical Engineering and Information Technology STU Bratislava Slovakia Bratislava Slovakia NASA Goddard Space Flight Center United States Honeybee Robotics United States University of Maryland College Park United States Georgetown University United States

ISBN: (纸本)9781713842989

Lava tube systems are of great interest for the future exploration of the Moon and Mars. On both celestial bodies, lava tubes could serve as sheltered environments for the construction of human settlements. Furthermore, Martian lava tubes may contain extant life and biosignatures. Accessing lava tubes, however, remains a challenge for both robotic and human operations, from a scientific, logistical and safety perspective. For these reasons, the exploration of lava tubes by humans and robots requires preparation in terrestrial analog environments, and is mandatory to successfully study lava tube systems elsewhere in the Solar System. Such studies have been performed on a regular basis during simulated lunar and Martian missions at the Hawaii Space Exploration Analog and Simulation (HI-SEAS) space research station in Hawaii. The International MoonBase Alliance organizes missions at HI-SEAS, during which crews of six analog astronauts perform research and technology testing relevant to the exploration of the Moon and Mars. Since the HI-SEAS habitat is located on lava flows on the volcano Mauna Loa, minimal plants and animals are present. Therefore, the wide variety of volcanic features can be explored for high-fidelity planetary science fieldwork, such as lava tubes, channels, and tumuli. This terrain is also ideal for rover and in situ resource utilization testing because of its great similarity to the basaltic terrains on the Moon and Mars. . HI-SEAS crews explored and collected research samples in the most accessible lava tubes while wearing Extra-vehicular Activity (EVA) analog spacesuits and following strict EVA protocols. HI-SEAS crews then performed biochemical and geophysical analyses for a variety of research projects. These activities are very challenging for the crew, due to the bulky gloves and EVA equipment they have to wear, while performing precise biochemical research that is sensitive to contamination. The crews also have to take into consideration the

关键词： Manned space flight

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Edge Dislocations and Their Effects on the Corrosion Evolution of Iron Based Materials in Liquid Lead Bismuth Eutectic: A Molecular Dynamics Study

SSRN

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SSRN 2023年

作者： Chen, Liming Liu, Sijie Wang, Li Gan, Shuyun Wen, Chunmei Li, Jiaqi Wu, Zhongzheng He, Xiaoxun Xu, Shuai Deng, Zhiyong Krsjak, Vladimir Daghbouj, Nabil Cao, Qilong Li, Bingsheng Faculty of Science Yibin University Yibin644000 China State Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and Technology Sichuan Mianyang621010 China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu610041 China Slovak University of Technology Faculty of Electrical Engineering and Information Technology Institute of Nuclear and Physical Engineering Ilkovicova 3 Bratislava81219 Slovakia Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Technická 2 Prague 6160 00 Czech Republic

The study investigated the effect of liquid lead bismuth eutectic (LBE) on the corrosion evolution of iron based materials with varying densities of edge dislocation defects. Molecular dynamics simulations were conducted at temperatures ranging from 823 K to 1173 K, and the process of penetration of Pb and Bi atoms at the dislocation core was analyzed. The results indicated that Fe atoms near the dislocation core have the lowest substitution energy 4.79 eV/atom), making them more likely to be replaced by Pb and Bi atoms. Moreover, it was found that the increase in dislocation density did not result in a higher penetration depth of LBE atoms, attributed to the interaction of dislocations. These findings provide crucial insights into the LBE corrosion mechanism in iron based materials with dislocation defects. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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Analysis of Digital Filtering with the Use of STM32 Family Microcontrollers 1

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20th Polish control Conference, PCC 2020

作者： Marciniak, Tomasz Podbucki, Kacper Suder, Jakub Dąbrowski, Adam Faculty of Control Robotics and Electrical Engineering Institute of Automatic Control and Robotics Division of Electronic Systems and Signal Processing Poznan University of Technology Jana Pawla II 24 Poznan60-965 Poland

ISBN: (数字)9783030509361

ISBN: (纸本)9783030509354

The paper presents an analysis of the realization of digital signal processing algorithms with the use of STM32F4 microcontrollers. Various programming techniques have been demonstrated focusing on the implementation of FIR filters and FFT calculations based on Cortex Microcontroller Software Interface Standard. During the tests we use STM32F407 Discovery module with WM5102 Wolfson Audio Card. The speed of algorithms and the accuracy of calculations were checked. The quality of digital filters were tested using LMS adaptive filter or Analog Discovery 2 device. © 2020, Springer Nature Switzerland AG.

关键词： Microcontrollers

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Fully Automated Bi-Hormonal Intraperitoneal Artificial Pancreas Using a Two-Layer PID control Scheme

Fully Automated Bi-Hormonal Intraperitoneal Artificial Pancr...

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European control Conference (ECC)

作者： Jana Langholz Karim Davari Benam Bindu Sharan Sebastien Gros Anders Lyngvi Fougner Institute of Control Systems Technical University of Hamburg Eißendorfer Straße 40 Hamburg Germany Department of Engineering Cybernetics Faculty of Information Technology and Electrical Engineering Norwegian University of Science and Technology (NTNU) O. S. Bragstads Plass 2D Trondheim Norway

Treatment of type 1 diabetes mellitus is significantly improved by using commercially available hybrid closed-loop systems to deliver insulin. These systems, also called artificial pancreas (AP), use the subcutaneous (SC) route to deliver insulin. However, meal announcements are necessary due to the slow insulin absorption from the SC tissue. Thus due to the need for human intervention, it is called “hybrid closed loop” AP. In this work, a bi-hormonal AP with intraperitoneal (IP) infusion is designed to increase the time within the range of 3.9-10.0 mmol/l and alleviate the burden of meal announcements. A two-layer controller is designed to provide safe and effective insulin and glucagon delivery. The primary layer is based on classical PID controllers for insulin and glucagon, and the supervisory layer includes four parts: (A) Zone-based control settings, (B) Extrapolation of sensor data to compensate for sensor delay in SC tissue, (C) Auto-tuning of the PID parameters in the primary layer through simulation in an animal model, and (D) Safety barriers. The controller is designed to prevent hypoglycemia after meals and during physical activity, as well as prevent postprandial hyperglycemia. The designed AP achieved 92.5% of the time within the range of 3.9-10.0 mmol/l on a simulator trained on data from animal experiments. The results indicate that this two-layer control structure with IP infusions makes it feasible to achieve a fully automated artificial pancreas without the need for meal announcements, i.e. without human intervention.

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The Effects of Edge Dislocaitons on the Corrosion Behavior of Pure Iron in Liquid Lead-Bismuth Eutectic: A Molecular Dynamics Study

SSRN

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SSRN 2023年

The study investigated the effect of liquid lead-bismuth eutectic (LBE) on the corrosion evolution of iron-based materials with varying densities of edge dislocation defects. Molecular dynamics simulations were conducted at temperatures ranging from 823 K to 1173 K, and the process of penetration of Pb and Bi atoms at the dislocation core was analyzed. The results indicated that Fe atoms near the dislocation core have the lowest substitution energy (-4.79 eV/atom), making them more likely to be replaced by Pb and Bi atoms. Moreover, it was found that the increase in dislocation density did not result in a higher penetration depth of LBE atoms, attributed to the interaction of dislocations. These findings provide crucial insights into the LBE corrosion mechanism in iron-based materials with dislocation defects. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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Reinforcement Learning with Large Language Model for Hybrid Disassembly Lines in Remanufacturing Contexts

Reinforcement Learning with Large Language Model for Hybrid ...

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IEEE International Conference on Automation Science and engineering (CASE)

作者： Peng Ji Xi Wang Guo Jiacun Wang Weitian Wang Shu Jin Qin Ying Tang Qi Kang College of Information and Control Engineering Liaoning Petrochemical University Fushun China Dept of Comp. Sci. and Soft. Eng. Monmouth University W. Long Branch NJ USA Collaborative Robotics and Smart Systems Laboratory (CRoSS Lab) Montclair State University Montclair NJ USA College of Economics and Management Shangqiu Normal University Shangqiu China Electrical and Computer Engineering Rowan University Glassboro New Jersey USA Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (数字)9798350358513

ISBN: (纸本)9798350358520

Large language models (LLM), ChatGPT is making substantial impact across various fields. This study for the first time presents a novel approach to the hybrid disassembly line balancing problem using LLM and reinforcement learning algorithms in remanufacturing contexts. The problem is divided into two sub-stages. LLM is innovatively used to capture a disassembly sequence well in the first stage, while reinforcement learning is utilized to address the problem in the second stage. Upon comparing the performance with and without LLM, the proposed approach significantly reduces the trial-and-error space and achieves faster convergence to achieve the desired solution. Future work of this study is also discussed.

关键词： Computer aided software engineering Automation Large language models Reinforcement learning Chatbots Convergence

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Mechanism of defect evolution in H^(+)and He^(+)implanted InP

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Chinese Physics B 2021年第8期30卷 70-74页

作者： Ren-Jie Liu Jia-Jie Lin N Daghbouj Jia-Liang Sun Tian-Gui You Peng Gao Nie-Feng Sun Min Liao Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China Hunan Provincial Key Laboratory of Thin Film Materials and Devices School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China China Nanhu Academy of Electronics and Information Technology Jiaxing 314000China Department of Control Engineering Faculty of Electrical EngineeringCzech Technical University in PragueTechnick´a 216000 Prague 6Czechia Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Science and Technology on Power Sources Laboratory Tianjin Institute of Power SourcesTianjin 300384China The 13th Research Institute CETCShijiazhuang 050051China

The defect evolution in InP with the 75 keV H^(+)and 115 keV He^(+)implantation at room temperature after subsequent annealing has been investigated in *** the same ion implantation fluence,the He^(+)implantation caused much broader damage distribution accompanied by much higher out-of-plane strain with respect to the H^(+)implanted *** annealing,the H^(+)implanted InP did not show any blistering or exfoliation on the surface even at the high fluence and the H2 molecules were stored in the heterogeneously oriented platelet ***,the He molecules were stored into the large bubbles which relaxed toward the free surface,creating blisters at the high fluence.

关键词： ion implantation defect evolution ion-slicing damaged band

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An Efficient Trajectory Planner for Car-like Robots on Uneven Terrain

arXiv

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arXiv 2023年

作者： Xu, Long Chai, Kaixin Han, Zhichao Liu, Hong Xu, Chao Cao, Yanjun Gao, Fei State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou310027 China Huzhou Institute of Zhejiang University Huzhou313000 China Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University Shaanxi Xi'An710049 China School of information and electrical engineering Hangzhou City University Hangzhou310015 China

Autonomous navigation of ground robots on uneven terrain is being considered in more and more tasks. However, uneven terrain will bring two problems to motion planning: how to assess the traversability of the terrain and how to cope with the dynamics model of the robot associated with the terrain. The trajectories generated by existing methods are often too conservative or cannot be tracked well by the controller since the second problem is not well solved. In this paper, we propose terrain pose mapping to describe the impact of terrain on the robot. With this mapping, we can obtain the SE(3) state of the robot on uneven terrain for a given state in SE(2). Then, based on it, we present a trajectory optimization framework for car-like robots on uneven terrain that can consider both of the above problems. The trajectories generated by our method conform to the dynamics model of the system without being overly conservative and yet able to be tracked well by the controller. We perform simulations and real-world experiments to validate the efficiency and trajectory quality of our algorithm. Copyright © 2023, The Authors. All rights reserved.

关键词： Trajectories

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Forewarning Crossing Intention of Pedestrians Using Multimodal Deep Learning Approach

Forewarning Crossing Intention of Pedestrians Using Multimod...

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International Conference on Green Technology and Sustainable Development (GTSD)

作者： Chi-Tam Nguyen Minh-Thien Duong Thanh-Danh Phan Van-Binh Nguyen My-Ha Le Intelligent System Laboratory HCMC University of Technology and Education Ho Chi Minh City Vietnam Dept. of Information and Telecommunication Engineering Soongsil University Seoul South Korea Dept. of Intelligent Systems and Robotics Chungbuk National University Cheongju South Korea Institute of Engineering-Technology Thu Dau Mot University Thu Dau Mot City Vietnam Faculty of Electrical and Electronics Engineering HCMC University of Technology and Education Ho Chi Minh City Vietnam

ISBN: (数字)9798350386073

ISBN: (纸本)9798350386080

Nowadays, traffic accidents not only come from public transportation but also from pedestrians. Therefore, designing a solution to protect pedestrian safety is essential. This article proposes a system for forewarning the crossing intentions of pedestrians, comprising the tasks of detection, tracking, and intention prediction. Firstly, our proposed system performs the detection and pose estimation of pedestrians using the YOLOv7-Pose model. Subsequently, the OC-SORT algorithm is employed for the tracking task. Ultimately, an efficient architecture based on the VoVNet backbone and Temporal Shift Module is provided to forewarn whether pedestrians will cross the road or not. The input of the proposed network in multimodality includes RGB image or semantic image map, keypoints, and vehicle speed. In addition, the bag-of-freebies technique is applied to enhance the model's overall performance and address the issue of biased model creation caused by imbalanced data. Comprehensive experiments performed on the JAAD benchmark dataset demonstrate that our proposed method performs better than existing benchmark classification models.

关键词： Pedestrians Roads Semantics Pose estimation Benchmark testing Prediction algorithms Data models

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