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Numerical Investigation on Super-cooled Large Droplet Icing of Fan Rotor Blade in Jet Engine

Journal of Thermal Science 2014年第5期23卷 432-437页

作者： Keisuke Isobe Masaya Suzuki Makoto Yamamoto Graduate School of Mechanical Engineering Tokyo University of Science6-3-1 NiijukuKatsushika-kuTokyo125-8585Japan Aviation Program Group Japan Aerospace Exploration Agency(JAXA)7-44-1 Jindaiji Higashi-machiChofu-shiTokyo182-8522Japan Department of Mechanical Engineering Tokyo University of Science6-3-1 NiijukuKatsushika-kuTokyo125-8585Japan

Icing(or ice accretion) is a phenomenon in which super-cooled water droplets impinge and accrete on a *** is well known that ice accretion on blades and vanes leads to performance degradation and has caused severe *** various anti-icing and deicing systems have been developed,such accidents still ***,it is important to clarify the phenomenon of ice accretion on an aircraft and in a jet ***,flight tests for ice accretion are very expensive,and in the wind tunnel it is difficult to reproduce all climate conditions where ice accretion can ***,it is expected that computational fluid dynamics(CFD),which can estimate ice accretion in various climate conditions,will be a useful way to predict and understand the ice accretion *** the other hand,although the icing caused by super-cooled large droplets(SLD) is very dangerous,the numerical method has not been established *** is why SLD icing is characterized by splash and bounce phenomena of droplets and they are very complex in *** the present study,we develop an ice accretion code considering the splash and bounce phenomena to predict SLD icing,and the code is applied to a fan rotor *** numerical results with and without the SLD icing model are *** this study,the influence of the SLD icing model is numerically clarified.

关键词： Ice Accretion Fan Rotor Blade Super-cooled Large Droplet Multi-physics Simulation

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Optimization and analysis of variability in high precision injection molding

Optimization and analysis of variability in high precision i...

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ASPE Spring Topical Meeting on Precision Micro/Nano Scale Polymer Based Component and Device Fabrication, ASPE 2005

作者： Castro, Carlos E. Lilly, Blaine Castro, José M. Ríos, Mauricio Cabrera Department of Industrial Welding and Systems Engineering Ohio State University Columbus OH 43202 United States Graduate Program in Systems Engineering Universidad Autónoma de Nuevo León San Nicolás de los Garza Nuevo-León 66450 Mexico

ISBN: (纸本)1887706372

Injection Molding (IM) is considered to be the most important process for mass-producing plastic products. One of the biggest challenges facing injection molders is to determine the best settings for the controllable process variables (CPVs). Selecting the proper settings is crucial because the behavior of the polymeric material during shaping is highly influenced by the process variables. The difficulty of optimizing an IM process is that the performance measures (PMs), such as surface quality or cycle time that characterize the adequacy of the part for its intended purpose usually show conflicting behavior. Furthermore, in actual molding, the CPVs will vary over some range during molding. This inconsistency of the process variables will lead to variability in the PMs. In high precision manufacturing, in particular for micro and nano scale components and devices, this variability needs to be minimized, and if possible eliminated. Thus, the variability in the PMs needs to be included in the optimization problem. The aim of this work is to demonstrate a method based on CAE, statistical testing, artificial neural networks (ANNs), and data envelopment analysis (DEA) to find the optimal compromises between multiple PMs and their variability to prescribe the values for the CPVs in IM. We present an example where the optimization is carried out in two phases. Phase one uses the PMs that are significantly affected by the injection gate location in order to prescribe two possible injection gates. Phase two of the optimization uses Data Envelopment Analysis (DEA) to find a PM-based efficient frontier for each injection gate considering process variability. These two efficient frontiers are then compared to select the best location. Other possible applications are discussed.

关键词： Injection molding

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Journal of Computing and Information Science in engineering 2009年第3期9卷 1-5页

作者： Zhang, Jingsheng Smith, Shana Human-Computer Interaction Graduate Program Iowa State University Ames IA 50011 United States Department of Mechanical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan

To achieve effective 3D shape retrieval, there is a crucial need for efficient shape matching methods. This paper introduces a new method for 3D shape matching, which uses a simplified octree representation of 3D mesh models. The simplified octree representation was developed to improve time and space efficiency over prior representations. The proposed method also stores octree information in extensible markup language format, rather than in a new proprietary data file type, to facilitate comparing models over the Internet. © 2009 by ASME.

关键词： Hypertext systems

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Current Panorama, Practice Gaps, and Recommendations to Accelerate the Transition to a Circular Bioeconomy in Latin America and the Caribbean

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Circular Economy and Sustainability 2022年第1期2卷 281-312页

作者： Salvador, Rodrigo Pereira, Reinalda Blanco Sales, Gabriel Fernandes de Oliveira, Vanessa Campana Vergani Halog, Anthony De Francisco, Antonio C. Sustainable Production Systems Laboratory (LESP) Graduate Program in Industrial Engineering (PPGEP) Universidade Tecnológica Federal Do Paraná (UTFPR) Ponta Grossa Brazil School of Earth and Environmental Sciences The University of Queensland St Lucia 4072 QLD Australia

The rampant use of resources and the increasing risk of scarcity have been contributing to greater awareness regarding the need for maintaining resources in use for longer and the shift to renewable alternatives, in which perspective the concept of a circular bioeconomy (CBE) has been permeating the most diverse sectors. Therefore, the study’s aims were manifold: identify (i) existing practices and initiatives, (ii) barriers and potential opportunities and (iii) existing gaps for advancing a circular bioeconomy in Latin America and the Caribbean (LAC) and (iv) provide recommendations aiming at the development of a circular bioeconomy (CBE) in the region. To that end, a systematic review of the existing academic literature was done, and reports from relevant non-peer reviewed sources were also consulted. CBE practices in LAC are concentrated in only a few of the countries in the region and very much revolve around recovering value from by-products and waste streams. There are a range of economic, technological, environmental, and social barriers. Opportunities for a CBE are mainly related to the use of waste as raw material (found abundantly in the countries being investigated) and the use of new techniques/technologies. The gaps between the current state and a successful CBE are related to policy, scaling-up, collaborations, and establishing efficient business models. Recommendations for a successful CBE in the region include greater engagement of public actors, investing and developing the local economy, establishing biorefineries and industrial parks, and finding new technological routes for bioresources. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Bioeconomy Circular bioeconomy Circular business Circular economy Latin America Policy

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Developing a conceptual framework for assessing printing companies operations sustainability pratices 22

Developing a conceptual framework for assessing printing com...

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22nd International Conference on Production Research, ICPR 2013

作者： Kai, Dalton Alexandre De Lima, Edson Pinheiro Gouvea Da Costa, Sergio E. Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Parana Imaculada Conceicao St. 1155 Curitiba Parana Brazil Federal University of Technlogy-Parana Curitiba Brazil Brazilian National Service for Industrial Apprenticeship-Parana Curitiba Brazil

There is a worldwide concern with sustainable development and this has compelled organizations to modify their management systems and operations design in order to fit to this new environment. To have a sustainable business and operations means to be economically viable, to reduce or even not generate waste, to conserve energy and natural resources, to be safe to workers, communities and consumers, to improve quality of life, and to share value. It is noticed that Brazilian printing companies understand these demands and they are promoting changes in their strategy, business models and operations systems. The main goal of this research is to propose a conceptual framework for organizing sustainability practices in printing industry companies' operations. It is intended to answer the following research question, based on manufacturing operations analysis: Does the printing industry runs its operations in a sustainable way? Observing standards practices for economic, environmental and social sustainable aspects. It was conducted a literature review and also it was recovered secondary data from governmental institutes and agencies as well from printing companies associations. These elements helped in characterizing the context, structures and processes for designing, implementing and managing printing enterprise sustainable operations. The proposed framework intends to contain best practices for developing a sustainable operation and to be used for auditing and normative purposes. This will allow companies to adapt their operations models and systems in order to create a real sustainable enterprise.

关键词： Sustainable development

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Service Oriented Design for Indonesian E-Government System Using SOA 6

Service Oriented Design for Indonesian E-Government System U...

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Joint Conference of the 6th Annual Conference of industrial and System engineering 2019, ACISE 2019 and 1st International Conference on Risk Management as an Interdisciplinary Approach 2019, ICRMIA 2019

作者： Fajar, A.N. Shofi, I.M. Information Systems Management Department BINUS Graduate Program-Master of Information Systems Management Bina Nusantara University Jakarta11480 Indonesia Informatics Engineering UIN Syarif Hidayatullah Indonesia

The objective of this study is to create a services design of E-Government system that can help Indonesian government to resolve some problems such as diversity platform and application. It causes the island applications that can make decision support processes is not well happen. In this study, we use literature review as an approach to discuss the phenomenon. It is performed by identifying, evaluating, and combining information from several other studies which relevant with this study's research questions. We use services oriented analysis and design approach to discussing the phenomenon. The ability of Service-oriented Architecture to connect multiple services between diversity systems and it can help the enterprise application travelling in Indonesian government. The case in this study is travelling system in Indonesia Government. The results in this study are the conceptual services for Travelling System using SOA approach and ESB Technology. It consists of several services and business services which is can be integrated among of them. © Published under licence by IOP Publishing Ltd.

关键词： Information services

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Displacement measurement using speckle correlation with reduced number of database patterns

Displacement measurement using speckle correlation with redu...

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28th Annual Meeting of the American Society for Precision engineering, ASPE 2013

作者： Farsad, Mahsa Goch, Gert Evans, Chris Optical Science and Engineering Graduate Program Center for Precision Metrology University of North Carolina Charlotte NC United States Department of Mechanical Engineering University of North Carolina Charlotte NC United States

ISBN: (纸本)9781887706636

This paper compares three methods of displacement measurement with 1 μm resolution using speckle pattern correlation. It shows to what extent the correlation curvecan be regarded as constant over a 100 μm interval and how it is possible to use this curve to reduce the number of required database patterns. Reducing the required database patterns makes it possible to expand the displacement measurement using speckle correlation to longer ranges and to two dimensions. This may lead to development of a two dimensional absolute scale for machine tools which could be fast and low cost.

关键词： Displacement measurement

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Empowering women as leaders: ADVANCE leadership programs at a doctoral STEM-dominant university

Empowering women as leaders: ADVANCE leadership programs at ...

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2009 ASEE Annual Conference and Exposition

作者： Johnson, Ane Layne, Margaret Terpenny, Janis Advance VT Virginia Tech United States Advance VT program Virginia Tech United States Mechanical Engineering and Engineering Education Virginia Tech United States Industrial and Systems Engineering Virginia Tech United States

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A two-dimensional expectation-perception analysis for RFID benefits in supply chain management

A two-dimensional expectation-perception analysis for RFID b...

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40th International Conference on Computers and industrial engineering, CIE40 2010

作者： Chuang, Pao-Tiao Barnes, J. Wesley Department of Asia-Pacific Industrial and Business Management National University of Kaohsiung Kaohsiung City Taiwan Graduate Program in Operations Research and Industrial Engineering University of Texas-Austin Austin TX United States

ISBN: (纸本)9781424472956

This paper explores two important themes in the implementation of RFID in supply chain management: (1) analyzing differences between actual (perceived) and potential (expected) key benefits to see if there are benefit shortfalls for the key performances;and (2) performing a two-dimensional expectation- perception analysis (EPA) for the purpose of identifying competitive niche and strategically allocating and adjusting the company's resources. Empirical data were collected through surveys of executives of selected Taiwan based companies who had experienced RFID adoption in the supply chain practices. Finally, managerial implications and suggestions were provided for companies and industries that may be considering the adoption of RFID in SCM.

关键词： Supply chain management

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Multi-objective Support Vector Machines Ensemble Generation for Water Quality Monitoring

Multi-objective Support Vector Machines Ensemble Generation ...

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Congress on Evolutionary Computation

作者： Victor Henrique Alves Ribeiro Gilberto Reynoso-Meza Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Parana (PUCPR) Curitiba Brazil

Real-world classification problems generally deal with imbalanced data, where one class represents the majority of the data set. The present work deals with event detection on a drinking-water quality time series, where the presence of a quality event is the minority class. In order to solve such problems, supervised learning algorithms are recommended. Researchers have also used multi-objective optimization (MOO) in order to generate diverse models to build ensembles of classifiers. Although MOO has been used for ensemble member generation, there is a lack on it's application for member selection, which is usually done by selecting a specific subset from the resulting models, or by using meta-algorithms, such as boosting. The proposed work comprises the application of MOO design in the whole process of ensemble generation. To do so, one multi-objective problem (MOP) is defined for the creation of a set of non-dominated solutions with Pareto-optimal support vector machines (SVM). After that, a second MOP is defined for the selection of such SVMs as members of an ensemble. Such methodology is compared to other member selection methods, such as: the single best classifier, an ensemble composed of the full set of non-dominated solutions, and the selection of a specific subset from the Pareto front. Results show that the proposed method is suitable for the creation of ensembles, achieving the highest classification scores.

关键词： Support vector machines Optimization Mood Training Event detection Kernel Supervised learning

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