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Numerical Treatment of Parametric Gradient Problems in Source Term by New Difference Methods

Journal of the Chinese Society of mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2018年第6期39卷 609-618页

作者： Shieh, Tzong-Hann Li, Meng-Rong Li, Yu-Tso Chen, Yung-Ting Department of Aerospace and Systems Engineering Feng Chia University 100 Wenhwa Rd. Seatwen Taichung Taiwan Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University 100 Wenhwa Rd. Seatwen Taichung Taiwan Department of Mathematical Sciences National Chengchi University 64 Sec. 2 ZhiNan Rd. Wenshan District Taipei Taiwan Department of Mechanical Engineering Minghsin University of Science and Technology No.1 Xinxing Rd. Xinfeng Hsinchu30401 Taiwan

In this paper, we expand the energy equation of unsteady Euler equations as the form of mixture gas and carry out the numerical resolution through the FVM to discuss the nonphysical oscillations near the contact discontinuity interface and shock wave. We resolve the equations by using the AUSMDV Riemann solver with different flux limiters, the FVM and the second-order with two-step discrete-time stepping method. For the source term in the investigated Euler equations with multi-species, we discuss the facing problem of for the numerical treatment of gradient in different type and test the non-physical oscillation problem by establishing a new applied method of gradient control. © 2018, Chinese mechanical engineering Society. All right reserved.

关键词： Euler equations

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Longitudinal motion control of air-breathing hypersonic vehicles based on time-varying models

Longitudinal motion control of air-breathing hypersonic vehi...

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14th AIAA/AHI International Space Planes and Hypersonics systems Technologies Conference

作者： Fidan, Bariş Kuipers, Matthew Ioannou, Petros A. Mirmirani, Maj National ICT Australia Ltd. Australian National University Canberra ACT 2601 Australia University of Southern California Los Angeles CA 90089 United States California State University Los Angeles CA 90032 United States Systems Engineering and Complex Systems Program Australia AIAA United States Electrical Engineering Department Mechanical Engineering Department

ISBN: (纸本)1563478269

The non-standard dynamic characteristics of air-breathing hypersonic flight vehicles together with the aerodynamic effects of hypersonic flight make the flight control of such systems highly challenging. Moreover the wide range of speed during operation and the lack of a broad flight dynamics database add significant plant parameter variations and uncertainties to the problem of controlling air-breathing hypersonic flight. In this paper, we present a general approach to this challenging problem based on linear time-varying plant models. This approach lets employment of some recent techniques developed for adaptive and non-adaptive control of systems with fast varying parameters via exploitation of a priori information about parameter variations. We discuss application of this approach to a generic analytical hypersonic flight vehicle model that is widely used in the literature as well as a detailed generic hypersonic vehicle concept model developed at the California State University - Los Angeles. The paper is concluded with some remarks on validations and extensions of the presented approach.

关键词： Spacecraft

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Addressing knowledge management transfer in project management at digital manufacturing

Addressing knowledge management transfer in project manageme...

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2018 Institute of Industrial and systems Engineers Annual Conference and Expo, IISE 2018

作者： Muncinelli, Gianfranco De Lima, Edson Pinheiro Deschamps, Fernando Gouvea Da Costa, Sergio E. Beller, Cassiano S. Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Parana Curitiba Brazil Federal University of Technology - Parana Curitiba Brazil Department of Mechanical Engineering Federal University of Parana Curitiba Brazil Superior Institute of Administration and Economy of Mercosul Curitiba Brazil

Manufacturing has been changing drastically the way it approaches facility design and implementation, that is, there is a growing adoption of digital techniques. This paper intends to determine the theoretical concepts and guidelines for assisting the study of alternatives for problem-solving in a specific case of an automaker digital manufacturing project. The main objective of the research is to determine the theoretical components that will assist in the forwarding of solutions to the problems observed in the current model of project management of digital manufacturing projects. The conceptual guidelines proposed based on systematic literature and guided the construction of research protocol that collects data from technical visits (semi-participative observation), technical documents and procedures, information systems log and archives, and semi-structured interviews. Data analysis use the mechanism of triangulation and workshops for producing a conceptual analysis about how each factor can assist in addressing the solving of the issues observed, building the theoretical constructs. The manufacturing engineering team could identify strengths and weakness on the ongoing practices and better plan improvements for reaching opportunities and mitigating threats/risks. The findings are classified in the following aspects: cultural, technology, knowledge content, organization, processes, and project management;and showed a complete analysis on how ready is the organization for developing digital manufacturing projects. © 2018 Institute of Industrial Engineers (IIE). All rights reserved.

关键词： Knowledge management

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Proposal of a framework for a disaster management system

Proposal of a framework for a disaster management system

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2016 Industrial and systems engineering Research Conference, ISERC 2016

作者： Foggiatto, Anderson Avanzi, Daniel de Freitas Rocha Loures, Eduardo Deschamps, Fernando Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Parana Curitiba Brazil Instituto Curitiba de Informática Curitiba Brazil Federal University of Technology - Parana Curitiba Brazil Department of Mechanical Engineering Federal University of Parana Curitiba Brazil

During a disaster, the more coordinated the response, the lesser its impacts are. One of the factors that has a major influence in response coordination is the interoperability among involved actors - public and private entities that interact to exchange information through the communication of people and systems. This factor is critical because it allows an efficient and effective mobilization of available resources towards reducing the effects caused by an event. This work proposes a framework for the development of Disaster Management systems (DMS) that promote real time communication (information flow and process coordination) among different involved entities, primarily focusing on interoperability in its different levels. This framework is based both on a literature review of scientific works and a survey of worldwide initiatives related to improving disaster response. The main components of the related framework architecture are an SDK (software development kit), a common relational database, multiple communication platforms (e.g., a Web portal and a mobile app), and low-cost hardware to better collect and make needed information available quickly and accurately. © 2016 Proceedings of the 2016 Industrial and systems engineering Research Conference, ISERC 2016. All rights reserved.

关键词： Interoperability

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Optimized Filling of a Given Cuboid with Spherical Powders for Additive Manufacturing

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Journal of the Operations Research Society of China 2021年第4期9卷 853-868页

作者： Zoya Duriagina Igor Lemishka Igor Litvinchev Jose Antonio Marmolejo Alexander Pankratov Tatiana Romanova Georgy Yaskov Lviv Polytechnic National University Lviv 79013Ukraine Katolicki Uniwersytet Lubelski Jana Pawła II Al.Racławickie 1420950 LublinPoland Graduate Program in Systems Engineering Nuevo Leon State University(UANL)MonterreyCP 66455 San Nicolas de los GarzaNuevo LeonMexico Engineering Department Panamerican UniversityCP 03920 Mexico CityMexico Department of Mathematical Modeling and Optimal Design Institute for Mechanical Engineering Problemsthe National Academy of Sciences of UkraineKharkiv 61046Ukraine Department of Systems Engineering of Kharkiv National University of Radio Electronics Kharkiv 61166Ukraine

In additive manufacturing(also known as 3D printing),a layer-by-layer buildup process is used for manufacturing *** laser 3D printers can work with various materials including metal *** particular,mixing various-sized spherical powders of titanium alloys is considered most promising for the aerospace *** achieve desired mechanical properties of the final product,it is necessary to maintain a certain proportional ratio between different powder *** this paper,a modeling approach for filling up a rectangular 3D volume by unequal spheres in a layer-by-layer manner is proposed.A relative number of spheres of a given radius(relative frequency)are known and have to be fulfilled in the final packing.A fast heuristic has been developed to solve this special packing *** results are compared with experimental findings for titanium alloy spherical *** relative frequencies obtained by using the imposed algorithm are very close to those obtained by the *** provides an opportunity for using a cheap numerical modeling instead of expensive experimental study.

关键词： Sphere packing Heuristic algorithm Titanium alloy spherical powders 3D printing

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SYSTEM-75 - PHYSICAL ARCHITECTURE AND DESIGN

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AT&T TECHNICAL JOURNAL 1985年第1期64卷 175-195页

作者： LOVERDE, AS FRISCH, HD LINDEMULDER, CR BAKER, D All Authors are employees of AT&T Information Systems Laboratories an entity of AT&T Information Systems Inc. Donn Baker: M.E. (Engineering) 1953 Stevens Institute of Technology Bell Laboratories Communications Development Training Program 1956 Bell Laboratories 1953–1982 AT&T Information Systems Laboratories 1983—. Howard D. Frisch: B.S.M.E. M.M.E. M.B.A. (Finance/Operations) Cornell University in 1979 1980 and 1981 respectively Bell Laboratories 1981–1983 Albert S. Loverde: B.S. (Mechanical Engineering) 1961 Purdue University M. S. (Engineering Mechanics) 1963 New York University Bell Laboratories Communications Development Training Program 1964 Bell Laboratories 1961–1982

This paper discusses the physical architecture, the rationale for design choices, and the physical design of the System 75 office communication system. The design features a single equipment cabinet housing up to 720 ports, a display-enhanced attendant console, and a modular-jack-based station-administration facility. The architecture minimizes the small system cost while providing modular building blocks for feature additions and growth. Customer participation in maintenance and administration is encouraged by attention to human factors in design and labeling details.

关键词： DIGITAL COMMUNICATION systems

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Haptic display for virtual reality: progress and challenges

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Virtual Reality & Intelligent Hardware 2019年第2期1卷 136-162页

作者： Dangxiao WANG Yuan GUO Shiyi LIU Yuru ZHANG Weiliang XU Jing XIAO State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100083China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100083China Peng Cheng Laboratory Shenzhen 518055China Department of Mechanical Engineering University of AucklandAuckland 1142New Zealand School of Computer Science and the Robotics Engineering Program Worcester Polytechnic InstituteWorcesterMA 01609-2280USA

Immersion, interaction, and imagination are three features of virtual reality (VR). Existing VR systems possess fairly realistic visual and auditory feedbacks, and however, are poor with haptic feedback, by means of which human can perceive the physical world via abundant haptic properties. Haptic display is an interface aiming to enable bilateral signal communications between human and computer, and thus to greatly enhance the immersion and interaction of VR systems. This paper surveys the paradigm shift of haptic display occurred in the past 30 years, which is classified into three stages, including desktop haptics, surface haptics, and wearable haptics. The driving forces, key technologies and typical applications in each stage are critically reviewed. Toward the future high-fidelity VR interaction, research challenges are highlighted concerning handheld haptic device, multimodal haptic device, and high fidelity haptic rendering. In the end, the importance of understanding human haptic perception for designing effective haptic devices is addressed.

关键词： Haptic display Virtual reality Desktop haptics Surface haptics Wearable haptics Multimodal haptics

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Micro-CT-based analysis of fibre-reinforced composites: Applications 18

Micro-CT-based analysis of fibre-reinforced composites: Appl...

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18th European Conference on Composite Materials, ECCM 2018

作者： Straumit, I. Baran, I. Gorbatikh, L. Farkas, L. Hahn, C. Ilin, K. Ivens, J. Lessard, L. Liu, Y. Nguyen, N. Matveeva, A. Mehdikhani, M. Shishkina, O. Soete, J. Takahashi, J. Vandepitte, D. Vasiukov, D. Wan, Y. Winterstein, E. Wevers, M. Lomov, S.V. Department of Materials Engineering KU Leuven Belgium Chair of Production Technology Faculty of Engineering Technology University of Twente Netherlands Siemens Industry Software NV Leuven Belgium Germany Department of Mechanical Engineering McGill University Montreal Canada Polymers and Composites Technology and Mechanical Engineering Department IMT Lille Douai France SIM M3 program Technologiepark 935 ZwijnaardeB-9052 Belgium Department of Systems Innovation University of Tokyo Japan Department of Mechanical Engineering KU Leuven Belgium

ISBN: (纸本)9781510896932

The paper presents an overview of cases in which the analysis of the internal structure and mechanical properties of fibre reinforced composites is performed based on the micro-computed X-ray tomography (micro-CT) reconstruction of the composite reinforcement geometry. In all the cases, the analysis relies on structure tensor-based algorithms for quantification of the micro-CT image, implemented in VoxTex software. © CCM 2020 - 18th European Conference on Composite Materials. All rights reserved.

关键词： Computerized tomography

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A compilation of home energy assessments for cool roofs, above-sheathing ventilation, radiant barriers, and other attic strategies 12

A compilation of home energy assessments for cool roofs, abo...

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11th International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings, Buildings XI

作者： Miller, William Desjarlais, Andre Kosny, Jan Oak RidgeTN United States Department of Mechanical Engineering University of Tennessee KnoxvilleTN United States Building Envelope Program ORNL United States Fraunhofer-MIT Center for Sustainable Energy Systems United States

A combined experimental and analytical study documented the thermal performance of cool roofs in combination with other roof and attic strategies. Cool-colored roofs are a first line of defense against heat transfer penetrating the conditioned space. However, radiant barriers, above-sheathing ventilation, low-emittance (low-e) surfaces in an inclined air space above the roof deck, insulation, and conventional and advanced thermal masses (i.e., phase-change materials) are all possible candidates that can enhance cool roof and attic performance. Field data and benchmarked computer simulations are reviewed to better understand energy and economic trade-offs in a variety of climates. © 2010 ASHRAE.

关键词： Roofs

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Pulse repetition interval-based excess fraction method for length measurement directly linked to a femtosecond optical frequency comb

Pulse repetition interval-based excess fraction method for l...

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Frontiers in Optics, FiO 2011

作者： Wei, Dong Takamasu, Kiyoshi Matsumoto, Hirokazu Global COE Program 'Mechanical Systems Innovation' School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-8656 Japan Department of Precision Engineering The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-8656 Japan

The principle of an arbitrary and absolute length measurement technique, called pulse repetition interval-based Excess Fraction method which is directly linked to a femtosecond optical frequency comb length standard t... 详细信息

ISBN: (纸本)9781557529176

关键词： Natural frequencies

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