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WHITHER FAST SEALIFT - A CALL TO ACTION

NAVAL ENGINEERS JOURNAL 1989年第4期101卷 81-92页

作者： HOPE, JP The author:received his B.S. degree in mechanical engineering from the University of Virginia in 1969. Upon graduation he began his career with the Navy in NavShips and in 1971 he transferred to the ship arrangements branch of NavSec. He was selected for the Navy long-term training program at The George Washington University in 1974 and completed the program in 1976 with the degree of master of engineering administration. While at NavSec he served as a task leader on numerous ship designs. He was selected for the first class of the NavSea commander's development program. While on that program he served in NavSea combat system program management system engineering and machinery engineering positions and also was assigned to the Navy secretariat. In 1985 he joined the staff of the assistant secretary of the Navy for shipbuilding and logistics where he is the assistant director for naval construction.

This paper begins with comments on accomplishments in sealift and a summary of current problems in fast sealift. These include: few fast sealift ships in the inventory, a diminishing industrial base capable of producing such ships, and a lack of production programs to build ships that would increase our national fast sealift capability. The paper discusses strategic mobility concepts and highlights system interactions and linkages in moving war materials and replacement forces from depots and factories to the front lines. From this foundation, the paper then discusses operational requirements “pull” as related to analysis and allocation of performance among components of the strategic mobility system. Sealift technology options are characterized and performance potential of these options are described. These characterizations include speed, ship lift capacity, equal cost fleet size, and fuel demands for a range of speeds from 24 to 50 knots. Performance potential for each option includes the total fleet lift capability stream over a 100-day time span for a notional mission with and without an assumed rate of attrition. Alternative program plans are described for each technology option addressing technological risk, system and component development needs, design requirements, production strategies, acquisition time lines, and resource requirements. The paper then revisits the operational requirements from a technologist's perspective. In a technology “push” approach, a set of practical and achievable requirements are selected that could be the basis of an effective and cost efficient production program for fast sealift ships. Finally, the paper concludes with a call to action that would suggest a modest reallocation of transportation resources to establish and sustain a fast sealift production program, sustain a sector of the maritime industrial base hard pressed by a lack of commercial shipbuilding, and achieve a relatively near-term increase in fast sealift capabil

关键词： Military engineering

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Application of programmable Logic Controller to Build-up an Intelligent Industry 4.0 Platform

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Procedia CIRP 2017年 63卷 150-155页

作者： Jian-Yu Chen Kuo-Cheng Tai Guo-Chin Chen Bachelor's Program of Precision System Design Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung 407 Taiwan Department of Mechanical and Computer-Aided Engineering Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung 407 Taiwan

Industry 4.0 is initiated by the German government as a high level technology strategy in order to keep Germany in a global leading position in manufacturing, also intends to solve energy and aging issues in parallel. Germany has proposed the “Reference Architecture Model Industries 4.0” which is based on the regulations published by the International Electrotechnical Commission. The manifestation of Industry 4.0 can be achieved by the realization of digital factory. And it's emphasized on total integration with Cyber Physical system as its core technology, via Internet of Things to realize the operational environment of human machine interaction, and the utilization of Big Data for decision making. The research motivation of this thesis is to utilize Totally Integrated Automation Portal as a digital factory software development platform, to achieve the fundamental educational requirements of digital factory, and to understand Industry 4.0 concept. Methodology of this research is based on a set of experimental and training mechanism, the sequence of machine movements is controlled by a programmable Logic Controller, and this PLC has to be complied with IEC61131 International Standard. Regarding communication technology also to be complied with IEC61158 and IEC62541 e.g. PROFINET and OPC UA protocol. And finally realizing the operational environment of human machine interaction via smart phone according to the outcome of this research, it has been shown that total integration concept can be realized by single production machine. By standardization of factory environment and increasing the level of operational environment of human machine interaction, productivity and quality of production could be significantly increased. PLC could be used to analyze intelligent platform and comply with the Industry 4.0 standard at the same time.

关键词： I4.0 Digitalization Factory PLC and IEC61131

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Loading Dependent Electrical Properties of Hybrid Perovskite Composite Media

Loading Dependent Electrical Properties of Hybrid Perovskite...

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MRS Advances

作者： Murphy, John P. Andriolo, Jessica M. Sutton, Nathan J. Wyss, Gary Skinner, Jack L. Montana Tech Nanotechology Laboratory 1300 W. Park Street ButteMT59701 United States Materials Science PhD Program Montana State University System United States Individual Interdisiplinary PhD Program University of Montana 32 Campus Drive MissoulaMT59812 United States Mechanical Engineering Department Montana Tech 1300 W. Park Street ButteMT59701 United States Center for Advanced Mineral and Metallurgical Processing Montana Tech ButteMT59701 United States

Hybrid organic-inorganic perovskites (HOIPs) have been previously compounded with hydrophobic polymers in order to improve the resilience of HOIPs in humid environments. In this study HOIP particles were synthesized and dispersed into a polymer solution. The weight loading of the HOIP phase in the composite was increased until an abrupt change in the electrical conduction was observed indicating a percolation threshold was approached. Additionally, the CH3NH3PbI3/ polystyrene composite media was characterized to assess morphology and the effect it has on the observed electrical properties. Copyright © Materials Research Society 2017.

关键词： Perovskite

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A Study on Giant Magnetostrictive Actuator for Interior Sound Control system of the Ultra-Compact Mobility: Fundamental Consideration on Formation of the Giant Magnetostrictive Phases Depending on Heat Treatment Condition 27

A Study on Giant Magnetostrictive Actuator for Interior Soun...

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27th International Conference on Electrical Machines and systems, ICEMS 2024

作者： Kato, Taro Naganuma, Ryusei Bando, Koki Sawada, Kentaro Wenbao, Wu Kobayashi, Ikkei Kuroda, Jumpei Uchino, Daigo Ogawa, Kazuki Ikeda, Keigo Endo, Ayato Kato, Hideaki Narita, Takayoshi Furui, Mitusaki Tokyo University of Technology Department of Mechanical Engineering 1404-1 Katakura Hachioji-shi Tokyo192-0982 Japan Sustainable Engineering Program Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura Hachioji-shi Tokyo192-0982 Japan Tokai University Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan Tokai University Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan Numazu College Department of Mechanical Engineering Ohoka 3600 Shizuoka Numazu-shi410-0022 Japan Aichi University of Technology Department of Electronic Robotics 50-2 Manori Nishisako-machi Aichi Gamagori-shi443-0047 Japan Hokkaido University of Science Department of Mechanical Engineering 7-Jo 15-4-1 Maeda Teine Hokkaido Sapporo006-8585 Japan Fukuoka Institute of Technology Department of Electrical Engineering Wajiro Higashi 3-30-1 Higashi-ku Fukuoka Fukuoka-shi811-0295 Japan Tokai University Department of Mechanical System Engineering Kitakaname 4-1-1 Kanagawa Hiratsuka-shi259-1292 Japan

ISBN: (纸本)9784886864406

An active noise control system using giant magnetostrictive actuator has been proposed as a countermeasure for interior noise of the ultra-compact mobilities, which is a new transportation tools. In this paper, as basic research toward the development of the proposed giant magnetostrictive actuator for active noise control, we conduct experiments on the material properties when terbium, dysprosium, and iron powder, which make up the giant magnetostrictive material, are mixed and the heat treatment conditions are changed. In this study, the heat treatment temperature was varied from 800°C to 1100°C in 100°C incrementsbased on the equilibrium state temperature of each material, and the heat treatment time was set in 30-minute increments from 1 hour to 3 hours. As a result, TbFe2 was confirmed after heat treatment at an electric furnace temperature of 1000°C for 3 hours, although its strength was insufficient. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Active noise control

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Numerical analysis of the unsteady cavitating flow in a 2D-cascade and a 3D-inducer

Numerical analysis of the unsteady cavitating flow in a 2D-c...

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43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference

作者： Ugajin, Hiroki Kawai, Masafumi Okita, Kohei Ohta, Takashi Kajishima, Takeo Nakano, Masataka Tomaru, Hiroshi IHI Corporation Tokyo 190-1297 Japan IHI Corporation Yokohama 235-8501 Japan RIKEN Wako Saitama 113-8656 Japan Osaka University Osaka 565-0871 Japan Space Technology Group Research and Engineering Division Aero-Engine and Space Operations 229 Tonogaya Mizuho-machi Nishitama-gun AIAA Fluid Group Research Laboratory Functionality Simulation and Information Team VCAD System Research Program Center for Intellectual Property Strategies Department of Mechanical Engineering Space Technology Group Research and Engineering Division Aero-Engine and Space Operations

ISBN: (纸本)1563479036

The unsteady cavitating flow in a turbopump inducer has been analyzed using CFD simulation results. An accurate three-dimensional detached eddy simulation (DES) code which took into account the cavitating phenomena was used. The three-dimensional code is based on the numerical method for compressible flow using low Mach number flow approximation. The cavitation is modeled by the source/sink of vapor phase in the liquid flow. The code has been applied for cavitating flows in both a 2D cascade and a 3D inducer. The computational results showed similar unsteady behaviors to experimental measurements in terms of the direction in cavity propagations and tendency in cavity developments. Mechanism for the unsteady cavitating flow such as rotating cavitation is investigated by analyzing the numerical results. One model is proposed to describe the reason why the cavity appears to propagate in the forward direction.

关键词： Unsteady flow

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Autonomous aerial perching and unperching using omnidirectional tiltrotor and switching controller

Autonomous aerial perching and unperching using omnidirectio...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Dongjae Lee Sunwoo Hwang Jeonghyun Byun Seung Jae Lee H. Jin Kim Department of Aerospace Engineering Seoul National University (SNU) Seoul South Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology (SEOULTECH) Seoul South Korea Department of Aerospace Engineering and Interdisciplinary Program in Artificial Intelligence (IPAI) Seoul National University Seoul Korea

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

Aerial unperching of multirotors has received little attention as opposed to perching that has been investigated to elongate operation time. This study presents a new aerial robot capable of both perching and unperching autonomously on/from a ferromagnetic surface during flight, and a switching controller to avoid rotor saturation and mitigate overshoot during transition between free-flight and perching. To enable stable perching and unperching maneuvers on/from a vertical surface, a lightweight (≈ 1 kg), fully actuated tiltrotor that can hover at 90 ◦ pitch angle is first developed. We design a perching/unperching module composed of a single servomotor and a magnet, which is then mounted on the tiltrotor. A switching controller including exclusive control modes for transitions between free-flight and perching is proposed. Lastly, we propose a simple yet effective strategy to ensure robust perching in the presence of measurement and control errors and avoid collisions with the perching site immediately after unperching. We validate the proposed framework in experiments where the tiltrotor successfully performs perching and unperching on/from a vertical surface during flight. We further show effectiveness of the proposed transition mode in the switching controller by ablation studies where large overshoot and even collision with a perching site occur. To the best of the authors’ knowledge, this work presents the first autonomous aerial unperching framework using a fully actuated tiltrotor.

关键词： Measurement uncertainty Rotors Switches Control systems Autonomous aerial vehicles Task analysis Servomotors

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The electric field distribution of a hybrid rectangular and circular waveguide resonator for use in granular material dielectric measurements

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IEEJ Transactions on Fundamentals and Materials 2015年第8期135卷 439-449页

作者： Kittiamornkul, Navapadol Jirasereeamornkul, Kamon Kiattisin, Supaporn Chamnongthai, Kosin Higuchi, Kohji Department of Electronic and Telecommunication Engineering King Mongkut's University of Technology Thonburi 126 Bangmod Tungkru Bangkok10140 Thailand Technology of Information System Management Program Faculty of Engineering Mahidol University 999 Salaya Nakhon Pathom73170 Thailand Department of Mechanical Engineering University of Electro-Communications 1-5-1 Chofugaoka Chofu182-8585 Japan

This paper represents a design for a hybrid rectangular and circular waveguide resonator. The resonator is designed specifically for the purpose of granular dielectric measurements, which resonates at 2.45 GHz. The electric field distributions of the proposed resonator will be compared against ordinary resonators, and illustrated using a 3D computer simulation of isosurfaces and their contours and 3D projections. In this simulation the properties of samples (paddies and soils) are loaded into each design, in order to observe the electrical field distributions of each sample. Next, the probability density functions (PDF) and cumulative distribution functions (CDF) shall be used to determine the probability of electric field distributions within each type of resonator. Each designed resonator was created in order to process real experiment circumstances. The experiments for each resonator were processed using 20 paddy samples and 20 soil samples, in order to replicate real circumstances in an efficient manner. The percentages of moisture content (%MC) from each design were compared against %MC obtained using dry weight methodology, used to find errors. From the results, mean square error (MSE) shows that the hybrid resonator can improve output greater than the ordinary resonators, which are the rectangular resonator and circular resonator, with 78.738% and 63.213% respectively for paddy sample, and 70.605% and 46.520% respectively for soil sample, respectively. This demonstrates that the proposed resonator creates better results than the ordinary resonators, although the sample is changed. © 2015 The Institute of Electrical Engineers of Japan.

关键词： Moisture

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Digital transformation of the healthcare value chain: Emergence of medical internet of things (MIoT) may need an integrated clinical environment, ICE Platform

arXiv

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arXiv 2017年

作者： Datta, Shoumen Palit Austin Goldman, Julian M. MIT Auto-ID Labs and Research Affiliate Dept of Mechanical Engineering Massachusetts Institute of Technology Medical Interoperability Program MDPnP Labs Massachusetts General Hospital Harvard Medical School Biomedical Engineering Department of Anesthesiology Director Medical Interoperability Program MDPnP Labs Partners HealthCare System Massachusetts General Hospital Harvard Medical School

The complexity of the healthcare ecosystem and the trans-disciplinary convergence which is essential for its function, makes it difficult to address healthcare as one domain. Divided in various stages for ease of management, healthcare is quintessentially a continuum which commences at birth and may cease at death. In this paper, we have attempted to take a broad view but it still isn't broad enough. We have focused on issues, such as, data and interoperability, yet it scratches only the surface of these sub-domains. For the specific problem at hand, we propose an "http" approach to adopt open standards to enable medical equipment and devices to share and synthesize data using ICE (integrated clinical environment), a medical device interoperability platform. ICE may help reduce deaths due to preventable medical errors. Thinking about the future of data in personal healthcare, we propose creating an ecosystem which contributes data from multiple health related domains. Data curation and analysis of the information may boost our health related knowledge. Increasing connectivity and improving infrastructure may help, among other things, to uncover facts and observations which may influence the future of global health. Copyright © 2017, The Authors. All rights reserved.

关键词： Health care

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A Conceptual Model of a Stereo Vision system to Aid a Teleoperated Robot in Pruning Vegetation Close to Overhead Urban Power Lines

A Conceptual Model of a Stereo Vision System to Aid a Teleop...

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2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2018

作者： Filho, Jose Francisco Bianchi Siebert, Luciano Cavalcante Mariani, Viviana Cocco Dos Santos Coelho, Leandro Electrical Engineering Department Federal University of Parana Power System Division Lactec Institutes Curitiba Brazil Mechanical Eng. Graduate Program - PPGEM And Federal University of Parana - UFPR Department of Electrical Engineering - DEE Pontifical Catholic University of Parana - PUCPR Uritiba PR Brazil

ISBN: (纸本)9781538649411

Detection of overhead urban lines is a primal information to ensure that a telerobotic pruning system will perform its task in a safe manner. In this context, this paper proposes a conceptual model of a computer vision system capable of identifying overhead urban lines and its three dimensional positioning by reviewing sensing technologies, applications of stereo vision with telerobotics and proposing a conceptual model to perform such task. © 2018 IEEE.

关键词： Maintenance

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Numerical Study of the Effective Combination of Microbubbles and Ultrasound in HIFU Therapy

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AIP Conference Proceedings 2011年第1期1359卷 437-442页

作者： Kohei Okita Kazuyasu Sugiyama Kenji Ono Shu Takagi Yoichiro Matsumoto aFunctionality Simulation and Information Team VCAD System Research Program RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan bDepartment of Mechanical Engineering The University of Tokyo 7‐3‐1 Hongo Bunkyo Tokyo 113‐8656 Japan cOrgan and Body Scale Simulation Team Computational Science Research Program RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan

The effective combination of microbubbles and ultrasound in HIFU therapy has been investigated through a numerical simulation. The equations for conservation of mass, momentum and energy are solved for a microbubble‐infused mixture, and model HIFU therapy in the presence of microbubbles. The bubbles follow Rayleigh‐Plesset equation, and are coupled with the mixture using the Euler‐Lagrange method. The impacts of both the volume fraction due to the microbubbles and the amplitude of the ultrasound on the heat distribution are analyzed by using a two dimensional cylindrical simulation of the propagation of focused ultrasound (1 MHz) through a mixture of bubbles 1.3 μm in diameter. As the initial void fraction increased, the shape of the high temperature region was observed to change from cigar shape, to tadpole shaped, to cone shape. It was numerically confirmed that the temperature dramatically increased by means of inertial cavitation. The results show that the effectiveness of HIFU therapy increases with increased initial void fraction, as well as an input ultrasound amplitude above the threshold required for inertial cavitation.

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