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A Large-Stroke 3-DOF Micromirror With Novel Lorentz Force-Based Actuators Utilizing Metallic Glass Thin Film

Journal of Microelectromechanical systems 2024年第1期33卷 46-53页

作者： Ou, Chuan-Hui Van Toan, Nguyen Tsai, Yao-Chuan Voiculescu, Ioana Toda, Masaya Ono, Takahito Tohoku University Department of Mechanical Systems Engineering Sendai980-8570 Japan National Chung Hsing University Department of Bio-Industrial Mechatronics Engineering Taichung City40227 Taiwan The City College of New York Department of Mechanical Engineering New YorkNY10031 United States Tohoku University Micro System Integration Center Department of Mechanical Systems Engineering Sendai980-8570 Japan

An electromagnetic tip-tilt-piston micromirror with a large stroke is presented. This research introduced a novel actuation structure, based on a spring made from conductive metallic glass with excellent mechanical properties. For the first time, two functional elements, an electromagnetic actuation element and a mechanical support structure, were successfully integrated into a single-layer spring, made of metallic glass. With this novel actuator, the performance of stroke and angle controllability is remarkably improved. The fabricated device can achieve a 418 ~\mu \text{m} static stroke in upward direction. Furthermore, the tilting angles of the micromirror can be controlled with maximum accuracy of 0.05°/mA. The device is robust and has miniature dimensions, comparable or smaller, than existing electromagnetic micromirror dimensions published in literature. The displacement values of the micromirror are larger, compared to state-of-the-art electromagnetic micromirrors, which usually have strokes under 300 ~\mu \text{m} and do not have angle control mechanism. In spectrometer applications, the micromirror with a large stroke and controllable angle allows spectrometers to achieve higher resolution. These special qualities of the micromirror, will provide efficient, and reliable spatial light modulation required for interferometer applications. [2023-0104] © 1992-2012 IEEE.

关键词： Interferometers

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Investigation of Wheel Robot Grouser Width Parameter Effect on Robot Mobility in Soft Sand Terrain Using Sand Test Bed 1

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4th International conference on Innovative Manufacturing, mechatronics and Materials Forum, iM3F2023

作者： Basri, Ikmanizardi Aziz, Intan Nur Aqiella Che Ibrahim, Ahmad Najmuddin Fukuoka, Yasuhiro Faculty of Manufacturing and Mechatronics Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pekan Campus Pahang Pekan26600 Malaysia Department of Mechanical System Engineering Ibaraki University College of Engineering Ibaraki University Hitachi316-8511 Japan

ISBN: (数字)9789819988198

ISBN: (纸本)9789819988181

Much research has been done to investigate the most ideal grouser parameters to improve a robot’s wheel mobility in sandy terrain. However, their area of research mainly focused on the normal wheel with fixed grousers. This paper showcases the study of performance of the assistive grouser wheel moving on a flat surface sandy terrain attached with different grouser width parameters. Two different grouser shapes were fabricated which consist of C-Shape and Wider C-Shape, with two configurations forward facing and inverse. For each grouser set, one of the grousers was attached with 2 load cell sensors used to measure force. The grousers were tested across a total of 3 runs to identify its total average traction force acting on the grouser during the wheel’s movement. The results show increased maximum positive and negative forces when the grouser width is increased, which resulted in less net traction force. The inverse configuration also showed better results than forward facing. This shows that for assistive mechanism, increasing the width of the grouser may not increase the effectiveness of the grouser in generating traction force. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Wheels

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Thermal Management and Dynamic Performance of a Cooler Design for the Supercritical CO2 Turbine Shaft Cooling

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FRONTIERS IN ENERGY RESEARCH 2022年 10卷

作者： Li, Jun Gurgenci, Hal Guan, Zhiqiang Li, Jishun Xue, Yujun Li, Lun School of Mechatronics Engineering Henan University of Science and Technology Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang China School of Mechanical and Mining Engineering University of Queensland Brisbane QLD Australia

This paper presents the results of a numerical study on a supercritical CO2 (SCO2) turboshaft cooling device by considering heat transfer and hydrodynamics. A micro-cooling device with a radius clearance of 50 micron and a nozzle diameter of 4 mm was designed and used to investigate the heat transfer characteristics of a micro-spacing impinging and gas film dynamics. Sixteen nozzles (N = 16) are equally spaced around the shaft in single or double rows. Investigations include journal speed- and eccentricity-dependent forward and cross-coupled force coefficients, and the effects of nozzle layouts and mass flow rate on the heat transfer efficiency. Analysis of the correlation coefficient shows that the gas density in the radial clearance is the dominant factor affecting the convective heat transfer performance, while the fluid velocity is a secondary factor. And the cooling efficiency (mass flow utilization rate) at low cooling pressure (p(s) < 0.7 MPa) is significantly greater than that at high cooling pressure (p(s) > 0.7 MP). In addition, considering the structure alone, a dual-row cooler exhibits a higher average Nusselt number, also registers a higher mass flow rate at the same pressure. Once the shaft is heated only one end, the difference in effectiveness between single- and dual-row cooling is not significant, so coolers with a single-row configuration should be preferred. Then, experimental values for the temperature of the heated rotor are provided under specific cooling airflow conditions. Dynamic analysis results show that the force coefficient of the single-row configuration is more dependent on the journal rotation speed and eccentricity ratio, and exhibits a negative direct stiffness coefficient at higher inlet pressure and journal rotation speed. Moreover, cross-coupled terms (stiffness coefficient) generally have a more explicit variation tendency than direct terms, and are more sensitive to changes in shaft speed and eccentricity. Small clearance cool

关键词： shaft cooling gas film stiffness heat transfer cooler jet impingement

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A generative deep learning framework for inverse design of compositionally complex bulk metallic glasses

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npj Computational Materials 2023年第1期9卷 2196-2203页

作者： Ziqing Zhou Yinghui Shang Xiaodi Liu Yong Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina City University of Hong Kong(Dongguan) 523000 DongguanChina College of Mechatronics and Control Engineering Shenzhen University518060 ShenzhenChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina

The design of bulk metallic glasses(BMGs)via machine learning(ML)has been a topic of active research ***,the prior ML models were mostly built upon supervised learning algorithms with human inputs to navigate the high dimensional compositional space,which becomes inefficient with the increasing compositional complexity in ***,we develop a generative deep-learning framework to directly generate compositionally complex BMGs,such as high entropy *** framework is built on the unsupervised Generative Adversarial Network(GAN)algorithm for data generation and the supervised Boosted Trees algorithm for data *** studied systematically the confounding effect of various data descriptors and the literature data on the effectiveness of our framework both numerically and *** importantly,we demonstrate that our generative deep learning framework is capable of producing composition-property mappings,therefore paving the way for the inverse design of BMGs.

关键词： inverse metallic entropy

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Design of a Novel Safe Approach to Monitor Drivers While Operating Their Cars 7

Design of a Novel Safe Approach to Monitor Drivers While Ope...

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7th International Conference on Advances in Biomedical engineering, ICABME 2023

作者： Elhawawsha, Aseel Zeine, Carla Zeid Daou, Roy Abi Kalinowski, Dominik Khattar, Joseph Telawi, Samer Boercsoek, Josef University of Kassel Department of Computer Architecture and System Programming Kassel Germany Université la Sagesse Saculty of Engineering Mechatronics Eng. Department Beirut Lebanon

ISBN: (纸本)9798350325850

Road accidents have been known to be one of the leading death causes around the world for a long time. Thus, cars and all kinds of road vehicles form a huge source of danger, and they relate to multiple high risks. There are many factors that can contribute to road traffic accidents such as the health condition of the driver if a medical emergency event happened while driving, drowsiness, or mind-wandering. The proposed system can monitor the behavior of the driver while driving as well as his/her health status. Moreover, it analyzes the monitored data, alerts the driver in a timely manner, and assists him/her in adjusting the driving behavior. Different dangerous and risky situations which can be faced during driving can be captured and avoided by using such a system which leads at the end to increase road traffic safety and reduce vehicle collisions. Notifications are developed in cases of drowsiness, loss of focus, or other concerns that may emerge while driving. However, when the driver's ability to operate the vehicle safely is hampered by a health concern, the implemented system is only able at this stage to alarm the driver itself and the surrounding cars as a first level of alarms. © 2023 IEEE.

关键词： Roads and streets

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Reward-Driven Clustered Federated Learning for DRL Based UAV-RIS Networks 8

Reward-Driven Clustered Federated Learning for DRL Based UAV...

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8th IEEE International Conference on Recent Advances and Innovations in engineering, ICRAIE 2023

作者： Wong, Yi Jie Tham, Mau-Luen Kwan, Ban-Hoe Iqbal, Amjad Lee, Ying Loong Chang, Yoong Choon Universiti Tunku Abdul Rahman Department of Electrical and Electronic Engineering Kajang Malaysia Universiti Tunku Abdul Rahman Department of Mechatronics and Biomedical Engineering Kajang Malaysia Carleton University Department of System and Computer Engineering Canada

ISBN: (纸本)9798350315516

Deep reinforcement learning (DRL) has empowered numerous reconfigurable intelligent surface (RIS) aided millimeter-wave unmanned aerial vehicle (UAV) communications. However, most existing works often employ single-Task DRL, that could only handle one specific environment (or task). This hurdles the large-scale adoption of DRL-based UAV-RIS networks, since the environment has infinite variations. In this paper, we aim to solve diverse UAV-RIS tasks with a minimum number of DRLs required. Specifically, we proposed a reward-driven clustering technique to autonomously cluster all 50 simulated tasks into 10 clusters. For each cluster, we train a multi-Task DRL using Federated Learning to handle all tasks in the cluster. Simulation shows that given 50 unique tasks, the proposed method could reduce the total agents required from 50 to 10, which is a 5-fold reduction. © 2023 IEEE.

关键词： Reinforcement learning

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Design of Seaweed Dryer Using Sugeno's Fuzzy Logic Control Approach 9

Design of Seaweed Dryer Using Sugeno's Fuzzy Logic Control A...

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9th IEEE Information Technology International Seminar, ITIS 2023

作者： Findiastuti, Weny Adiputra, Firmansyah Annisa, Rullie Hanafi, Firmansyah Hidayat, Samsul University of Trunojoyo Madura Department of Industrial Engineering Bangkalan Indonesia University of Trunojoyo Madura Department of Information System Bangkalan Indonesia University of Trunojoyo Madura Department of Mechatronics Engineering Bangkalan Indonesia

ISBN: (纸本)9798350306835

This research aims to develop an innovative seaweed dryer with Sugeno Fuzzy Logic Control. In Indonesia, seaweed, especially Eucheuma cottonii, has high economic value, but traditional drying risks reducing its quality. This research focuses on developing an efficient and effective drying mechanism using the fuzzy logic concept. With Sugeno Fuzzy Logic Control, this system can overcome environmental uncertainties such as temperature and humidity, and adapt well. As a result, the quality and efficiency of seaweed drying are significantly improved, potentially providing benefits to the seaweed industry and expanding the understanding of fuzzy logic in industrial control. © 2023 IEEE.

关键词： Fuzzy logic

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Influence of unstable working conditions on friction torque of angular contact ball bearings 6

Influence of unstable working conditions on friction torque ...

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2023 6th World Conference on Mechanical engineering and Intelligent Manufacturing, WCMEIM 2023

作者： Zhang, Ruoyu Yu, Yongjian Li, Jishun Xue, Yujun School of Mechatronics Engineering Henan University of Science and Technology Henan Luoyang China Henan Key Laboratory for Machinery Design and Transmission System Henan Luoyang China Longmen Laboratory Henan Luoyang China

The influence of rolling element material on friction torque of angular contact ball bearing under variable speed, variable load, and variable load conditions are studied. Based on the unstable working conditions of variable speed and load, the dynamic model of bearing is established by using CMD language in the ADAMS system, and the simulation analysis is carried out. The results show that under variable speed conditions, the shorter the acceleration time is, the greater the radial and axial loads are, and the greater the friction torque of the bearing is;Under variable load conditions, the friction torque of the bearing increases with the increase of load change frequency, and the friction torque of the hybrid ceramic ball bearing is smaller than that of the GCr15 rolling element bearing. The research results provide a reference for reducing the friction heat generation of bearings and improving the operation reliability of bearings under unstable working conditions. © Published under licence by IOP Publishing Ltd.

关键词： Angular contact ball bearings

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Movement Analysis of a Landing Buffer Mobile Mechanism with Eccentric Load 16th

Movement Analysis of a Landing Buffer Mobile Mechanism with ...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Liu, Wei Chen, Zhijun Yang, Fei Zhao, Yong Yang, Jianzhong Gao, Feng Beijing Institute of Spacecraft System Engineering Beijing100094 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200030 China School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China

ISBN: (纸本)9789819964949

Based on the traditional four-legged landing buffer mechanism, a buffer mobile integration mechanism with landing cushioning and active movement is proposed, providing the moving capability of the lunar surface for the large mass lander of more than 1 ton. The mobile planning strategy is designed and a mobile gait planning method is provided. The kinematics model of the mechanism is established, and the movement performance of the four-leg parallel system in a symmetrical standing posture is analyzed. As for the gravity center offset of the lander, an adjustment method for the asymmetric standing posture of the four legs is proposed, and the movement characteristics of the lander after applying this method are further analyzed. The results show that the lander can successfully move uphill, flat, and downhill, solving the problem of omnidirectional movement under the uncertainty of landing terrain and orientation. The proposed buffer mobile mechanism and the adjustment method for an asymmetric standing posture of four legs provide support for future catalog buffering movement detection tasks. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Landing

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Mn-based MXene with high lithium-ion storage capacity

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Nano Research 2024年第5期17卷 4181-4191页

作者： Yanyan Wu Dongqing Liu Xiaonan Wang Usman Ghani Muhammad Asim Mushtaq Jinfeng Yang Huarui Sun Panagiotis Tsiakaras Xingke Cai School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of Technology ShenzhenShenzhen 5180552 China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Laboratory of Alternative Energy Conversion Systems Department of Mechanical EngineeringSchool of EngineeringUniversity of ThessalyPedion Areos 38834Greece

3d-transition metal(Fe,Co,Ni,and Mn)-based MXene materials have been predicted to demonstrate exceptional electrochemical performance because of their good electrical conductivity and the presence of metallic atoms with multiple charge ***,until now,there have been no reports on MXenes based on Fe,Co,Ni,and Mn,due to the lack of 3d-metal-layered ***,we successfully synthesized the first 3d-transition metal-based MXenes,Mn_(2)CT_(x) by exfoliating a layered precursor derived from the anti-perovskite bulk *** as-prepared Mn_(2)CT_(x) MXene nanosheets were employed as anode materials in lithium-ion batteries,which exhibited stable storage capacity of 764.7 mAh·g^(-1) at 0.5 C,placing its storage capacities at an upper-middle level compared with other reported MXene materials as well as other Mn-based anode ***,this study opens a new avenue for MXene research by synthesizing 3d-transition metal-based MXenes for electrochemical applications.

关键词： Mn_(3)GaC Mn_(2)CT_(x) MXenes lithium-ion battery anode materials negative fading capacity

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