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Behavior of plane synthetic jets generated by an asymmetric stepped slot

International Journal of Fluid Machinery and systems 2020年第1期13卷 253-265页

作者： Kobayashi, Ryota Terakado, Hiroaki Sato, Kotaro Taniguchi, Junya Nishibe, Koichi Yokota, Kazuhiko Mechanical Engineering Program in the Graduate School of Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Mechanical Engineering Program in the Graduate School of Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Department of Mechanical System Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Graduate School of Integrative Science and Engineering Tokyo City University 1-28-1 Tamatsuzumi Setagaya-ku Tokyo158-8557 Japan Department of Mechanical Engineering Tokyo City University 1-28-1 Tamatsuzumi Setagaya-ku Tokyo158-8557 Japan Department of Mechanical Engineering Aoyama Gakuin University 5-10-1 Fuchinobe Sagamihara-shi Kanagawa252-5258 Japan

This paper presents a fundamental study of jet directional control, i.e., thrust vectoring, using a synthetic jet generated by an asymmetric stepped slot. We present and discuss the results for a synthetic jet generated by a one-sided asymmetric stepped slot and focus on the relationship between the traveling direction of the formed jet and the offset ratio of the stepped slot and/or dimensionless frequency of the synthetic jet, within a jet deflection angle range of 0–90°. We demonstrate that there is an optimum offset ratio for jet deflection under the same dimensionless frequency because the traveling direction of the synthetic jet is dependent on the offset ratio of the stepped slot and the dimensionless stroke length (dimensionless frequency). © 2020, Turbomachinery Society of Japan. All rights reserved.

关键词： Jets

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Variations in the acoustic measurement of earbud earphones in an ane-choic chamber due to changes in the earphone placement in ear Concha

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Canadian Acoustics - Acoustique Canadienne 2020年第4期48卷 29-40页

作者： Pawar, S.J. Liu, Y.C. Huang, Jin H. Department of Applied Mechanics Motilal Nehru National Institute of Technology Allahabad Prayagraj India Bachelor's Program in Precision System Design Feng Chia University Taichung Taiwan Department of Mechanical and Computer-Aided Engineering Feng Chia University Taichung Taiwan

The growth of consumer electronic products is encouraged by innovations and has stimulated the persistent development of earphones for high-quality sound reproduction. Earbud earphone is located in the concha of the human ear facing an ear-canal. The placement of earphones in the concha plays a remarkable role in the sound pressure level response of an earphone. In this study, ten earphones were tested for frequency response and total harmonic distortion using head and torso simulator in an anechoic chamber. Three positions and two orientations of earphones in the concha were identified for measurement. Based on the responses of all earphones at all orientations and positions, it is concluded that there is a variation in the frequency response and total harmonic distortion. Even though the variation is small in magnitude, its effect on sound perception, sound exposure, and the hearing threshold is phenomenal. Based on the proposition presented in this work and the safe daily sound exposure, it has been determined that the variation in the frequency response affects the perceived loudness of sound and can cause signif-icant differences in the daily sound exposure limit for a human being. © 2020, Canadian Acoustical Association. All rights reserved.

关键词： Frequency response

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Analysis of the bending and torsion strength of TOPCon solar cells cut by thermal laser separation technology: Advantages for vehicle-integrated photovoltaics

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Solar Energy Materials and Solar Cells 2025年 292卷

作者： Daisuke Sato Shunto Honda Tomoya Tanimoto Benjamin Lee Steffen Geißler Yukio Miyashita Noboru Yamada Faculty of Engineering Electrical and Electronic System Program University of Miyazaki 1-1 Gakuen Kibanadai-nishi Miyazaki 889-2192 Japan GX Research Center University of Miyazaki 1-1 Gakuen Kibanadai-nishi Miyazaki 889-2192 Japan Department of Mechanical Engineering Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan Hanwha Q CELLS GmbH Sonnenallee 17-21 06766 Bitterfeld-Wolfen Germany

The rapid deployment of photovoltaic (PV) systems in diverse applications is crucial for facilitating the transition to a carbon-neutral society. Vehicle-integrated PV (VIPV) technology shows promise in reducing CO 2 emissions within the transportation sector. However, several challenges must be addressed in the design and fabrication of VIPV modules, including compatibility with 3D curved vehicle bodies and durability under various mechanical loads encountered in operating environments—such as torsion of the targeted installation bodies—which differ from the requirements of conventional static PV modules. This study quantitatively analyzes the mechanical strength (bending and torsion) of tunnel oxide passivated contact (TOPCon) crystalline silicon solar cells cut using thermal laser separation (TLS) technology through comparison with identical solar cells cut using laser scribing and cleaving (LSC) technology. Ball-on-ring and four-line bend tests are conducted on state-of-the-art TOPCon half-cells, and their stress characteristics under spherical surface deformation are evaluated through finite element method simulations, revealing the optimal cell size (182 mm × 45.5 mm, aspect ratio = 4) for integration into a spherical surface with curvature radius of 1 m. In addition, the torsional strength of the TOPCon half-cells integrated into a polymer-based submodule is experimentally assessed, and the mechanism of crack initiation is identified. The results demonstrate the superior durability of TLS-cut cells against bending and torsion loads compared with LSC-cut cells, indicating their advantages for VIPV applications.

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Dynamic Load Comparison between Fully Coupled and Simplified Models on Offshore Wind Turbines with Jacket Support Structures under Seismic Conditions 28

Dynamic Load Comparison between Fully Coupled and Simplified...

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28th International Ocean and Polar engineering Conference, 2018

作者： Lai, Wen-Jeng Su, Wei-Nian Huang, Chin-Cheng Huang, Yi-Mei Mechanical and System Engineering Program Institute of Nuclear Energy Research Taiwan Department of Mechanical Engineering National Central University Taiwan

ISBN: (纸本)9781880653876

The dynamic load calculation of offshore wind turbine is an important technology in the future development of wind turbine industry in Taiwan. This paper presents a simplified equivalent-monopile model of reducing the dynamic load simulation time for offshore wind turbines with jacket support structures under seismic conditions. The FAST v7 code that only simulates monopile substructure is chosen as the analysis tool and is further recompiled to include the effect of seismic-pile-soil interaction in the simplified model. The numerical analysis results are then validated by comparing with the results from the fully coupled model, calculated by Bladed software, in a NREL 5MW offshore wind turbine. Two seismic load scenarios, operational and idling conditions, are studied in this work. The results show that usage of simplified model may offer advantages in preliminary support structure design. The advantages are apparent in seismic simulation since the simplified equivalent-monopile modeling allows current FAST v.7 code constraints relaxed for simulating jacket structures and leads to quicker and more convenient dynamic load calculation. The influence of earthquake and soil flexibility is especially important in design considerations since Taiwan is located in a seismically active region. Thus, the developed simplified numerical model will be helpful to shorten the simulation time of a series of seismic design load cases in the preliminary design phase. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Dynamic loads

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Numerical Fatigue Analysis for Jacket-type Substructure of Offshore Wind Turbines under Local Environmental Conditions in Taiwan 28

Numerical Fatigue Analysis for Jacket-type Substructure of O...

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28th International Ocean and Polar engineering Conference, ISOPE 2018

作者： Fan, Ting-Yu Lin, Chin-Yu Huang, Chin-Cheng Chu, Tung-Liang Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan City Taiwan

ISBN: (纸本)9781880653876

This paper is to perform a series of fatigue analyses for reference offshore wind turbine (OWT) under Taiwan local environmental conditions to investigate the potential design load cases (DLCs) which could affect the overall calculation procedure and improve the design calculation efficiency. Based on sequentially coupled approaches, NREL FAST and ANSYS software are employed to analyze the dynamic responses of offshore wind turbine system and jacket-type substructure under various DLCs defined in the international standard IEC 61400-3. The stress distributions around the intersection of tubular joints under the axial, in-plane and out-of-plane loads are computed to determine the stress concentration factors. Using conventional Rainflow counting algorithm, the cumulative fatigue damage (CFD) factors for tubular joints can be thus calculated with S-N curves and Palmgren-Miner's rule. The computed results show fatigue damage caused by power production design scenario is more dominant and accounting for the ratio of total cumulative fatigue damage up to 90%. This work with more efficient load calculation procedure (LCP) in preliminary design will be helpful for cost assessment and selection of adequate types of substructures to be utilized in future offshore wind farms in Taiwan. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Offshore wind turbines

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Lateral force analysis of an acoustic levitated plate using boundary element method 25

Lateral force analysis of an acoustic levitated plate using ...

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Matsumoto, Kosuke Masuda, Arata Kyoto Institute of Technology Master Program of Mechanical and System Engineering Kyoto Japan Kyoto Institute of Technology Mechanical Engineering Kyoto Japan

ISBN: (纸本)9781510868458

In this study, the lateral force acting on an acoustically levitated plate in a near-field acoustic levitation setup is numerically analyzed to understand the in-plane behavior of the levitated plate. A vibrating surface in a ultrasound frequency can levitate a planer object by the effect of the acoustic pressure radiated from the surface. This is called near-field acoustic levitation. At the same time, the sound pressure distribution in the air gap between the radiation surface and the levitated plate generates an acoustic streaming which yield the acoustic viscous stress on the surface of the levitated plate. The resulting force and torque acting on the levitated plate governs the stability and the in-plane motion of the plate. In this paper, the force acting on the levitated plate is calculated by integrating the acoustic viscous stress which is derived through the Nyborg's formulation of the acoustic streaming and the sound field analysis using the boundary element method (BEM), which can properly take account of the effect of the infinite medium. The validity of the calculation is verified by comparing the calculated force with experimental results reported in the *** dependence of the force on the lateral position of the levitated plate is then discussed in terms of the in-plane stability. © 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved.

关键词： Boundary element method

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Autonomous Base Station Placement for Localization of the GNSS Interference Source

Autonomous Base Station Placement for Localization of the GN...

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2018 International Symposium on Global Navigation Satellite system, ISGNSS 2018

作者： Kim, Sun Young Kang, Chang Ho Park, Chan Gook Mechanical and Aerospace Engineering and Automation and System Research Institute Seoul National University Gawnak-Gu Seoul08826 Korea Republic of BK21+ Transformative Training Program for Creative Mechanical and Aerospace Engineers Seoul National University Gawnak-Gu Seoul08826 Korea Republic of Mechanical and Aerospace Engineering and the Institute of Advanced Aerospace Technology Seoul National University Gawnak-Gu Seoul08826 Korea Republic of

This paper presents the control strategy of autonomous base station placement for localization of the GNSS interference source. The proposed algorithm deals with the optimization of the base station trajectory for target motion analysis based on bearing only tracking problem. The control strategy of the proposed algorithm is designed to maximize a cost function which is generally a functional of the Fisher information matrix. Compared to the optimal control methods, the proposed algorithm is easy to be designed and implemented, and constraints of multiple base stations' trajectories can be effectively included. In addition, the proposed algorithm also considered target's dynamics that is both uncertain and random, and there are multiple base stations for observing the target. In order to verify the performance of the proposed algorithm, simulation was performed with dynamic target case in the 2D scenario. It is assumed that the base stations' networks have non-fully connected topology. According to the simulation results, it was confirmed that the proposed algorithm presents a flexible control strategy of autonomous multiple base stations' placement for bearing only target tracking system. © The Authors, published by EDP Sciences, 2019.

关键词： Base stations

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Preliminary study on modelling and simulation of virtual reality assistive tool for autism children using gaming software

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AIP Conference Proceedings 2023年 040001页

作者： Shahrol Mohamaddan Ting Sing Hong Annisa Jamali Siti Raudzah Ghazali Saidatul Ardeenawatie Awang Peeraya Sripian Akihiko Hanafusa Department of Bioscience and Engineering College of System Engineering and Science Shibaura Institute of Technology Fukasaku 307 3378570 Saitama Japan Department of Mechanical and Manufacturing Faculty of Engineering Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia Department of Medical Psychology Faculty of Medicine and Health Sciences Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia Department of Biomedical Electronics Faculty of Electronics Engineering Universiti Malaysia Perlis 02600 Arau Perlis Malaysia Innovative Global Program College of Engineering Shibaura Institute of Technology Kotoku Toyosu 3-7-5 135-8548 Tokyo Japan

Autism Spectrum Disorder (ASD) is an early childhood disorder that affects individual ability to interact and socialize with other people. Children with ASD have problems interacting with their peers and have difficulty to exercise their social skills. In this study, a virtual reality (VR) based assistive tool was modelled and simulated using a gaming software called Dark Basic Professional (DBPro). The assistive tool was developed to support ASD children to interact and apply the social skills. Seven tasks were designed for the VR assistive tool based on three targeted skills including facial expression recognition, reading comprehension, and task delivery. As a preliminary study, only three non-ASD children were participated in the VR assistive tool experiment to analyse the tasks. The experiment results showed that all participants successfully performed five out of seven tasks. However, all participants failed to perform the video prompting task while one participant was not able to recognize the emotion from robotics-based faces in the facial expression. The results from pulse sensor showed that the heart rate was stable during the basic experiment using VR but unstable during the applied experiment and real-world discussion. There is a need to review the overall modelling and simulation technique, and the number of participants among ASD children should be increased for the future study.

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Double Layers Omega FETs with Ferroelectric HfZrO2 for One-Transistor Memory

Double Layers Omega FETs with Ferroelectric HfZrO2 for One-T...

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Annual International Symposium on Reliability Physics

作者： K.-T. Chen C. Lo Y.-Y. Lin C.-Y. Chueh C. Chang G.-Y. Siang Y.-J. Tseng Y.-J. Yang F.-C. Hsieh S.-H. Chang H. Liang S.-H. Chiang J.-H. Liu Y.-D. Lin P.-C. Yeh C.-Y. Wang H.-Y. Yang P.-J. Tzeng M.-H. Liao S. T. Chang Y.-Y. Tseng M. H. Lee Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Electronic and Optoelectronic System Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan Department of Mechanical Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Chung Hsing University Taichung Taiwan TCAD Silicon Engineering Group Synopsys Taiwan Co. Ltd. Hsinchu Taiwan

ISBN: (数字)9781728131993

ISBN: (纸本)9781728132006

The 3D double layer Ω-type FETs with ferroelectric HfZrO 2 gate served for one-transistor (1T) architecture is demonstrated and studied for memory reliability. The high endurance is presented more than 10 6 cycles P/E with 4V. Multi-domain model integrated with TCAD is proposed by adding a coupling coefficient for the polarization gradient term of the free energy, and calculating for nanosheet GAA-FETs. The polarization orientation is assigned randomly by Gaussian distribution into individual domain for multi-dimensional 3D device simulation. The data retention is degraded due to depolarization field occurrence at the corner by modeling results. The feasible structure paves the candidate for emerging memory applications.

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Improve the through-thickness electrical conductivity of cfrp laminate using flow-aligned carbon nanofiber Z-threads

Improve the through-thickness electrical conductivity of cfr...

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SAMPE Long Beach 2018 Conference and Exhibition

作者： Ranabhat, Bikash Hsiao, Kuang-Ting University of South Alabama Department of Mechanical Engineering Shelby Hall 150 Jaguar Drive MobileAL36608 United States System Engineering Program United States

ISBN: (纸本)9781934551271

Traditional Carbon Fiber Reinforced Plastics (CFRPs), carry high in-plane strength and electrical conductivity but exhibit intrinsic weaknesses in strength, toughness and conductivity in the through-thickness direction (i.e. z-direction). This paper presents a novel approach to align and thread Carbon Nanofibers (CNFs) through the porous medium (Carbon fiber fabric) using an interesting radial-flow alignment method and manufacture a novel CNFs z-threaded CFRP prepreg. This new radial-flow alignment approach is unique and has been found highly effective to z-thread the array of carbon fibers (diameter ~ 7 microns) with numerous long CNFs (length ~ 50-200 microns) under a Scanning Electronic Microscope (SEM) analysis. Experimental tests performed on a cured laminate sample prepared by this novel technique with 1 wt% aligned CNF concentration showed a significant improvement on the z-directional electrical conductivity for direct current (DC). The 1 wt% CNFs z-threaded CFRP was found about 100 times as conductive as the control CFRP;whereas the unaligned 1 wt% CNFs modified CFRP was only about 16 times as conductive as the control sample. © 2017 by Bikash Ranabhat and Kuang-Ting Hsiao. Published by Society for the Advancement of Material and Process engineering with permission.

关键词： Carbon nanofibers

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