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Dynamic behavior of a fluid plain journal bearing with incompressible fluid considering nonlinear fluid forces

WIT Transactions on the Built Environment 2003年 71卷 188-196页

作者： Shintani, A. Fujita, K. Yoshioka, K. Okuno, K. Anaka, H. Asaida, Y. Mechanical Systems Engineering Graduate School of Engineering Osaka Prefecture University Japan Matsushita Electric Industrial Japan

Recently, in many areas such as computers and information equipments etc., the fluid journal bearings are required to rotate at higher speed. To satisfy this requirement, the strictly stability analysis of the journal is indispensable. In this paper, we investigate the stability analysis of the dynamic behavior of the fluid plain journal bearing with incompressible fluid considering the nonlinear terms of fluid forces. The stability analysis is examined by the numerical simulations on each model of rigid rotor and flexible rotor. The stable regions are compared by nonlinear analysis with the regions by classical linear analysis. Performing nonlinear simulation analysis, it becomes clear that there is rather a stable region in which the amplitude does not increase abruptly, and this phenomenon can not only be pointed out, but also is judged to be unstable by linear stable analysis. Finally, the experiment using actual bearings is performed and compared with the numerical results. © 2004 WIT Press.

关键词： Journal bearings

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Cascaded evolutionary multiobjective identification based on correlation function statistical tests for improving velocity analyzes in swimming

Cascaded evolutionary multiobjective identification based on...

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IEEE Symposium on Computational Intelligence in Multi-Criteria Decision-Making, MCDM

作者： Helon Vicente Hultmann Ayala Luciano Ferreira da Cruz Roberto Zanetti Freire Leandro dos Santos Coelho Industrial and Systems Engineering Graduate Program PUCPR Curitiba Brazil Department of Electrical Engineering PUCPR UFPR Curitiba Brazil

By using biomechanical analyses applied to sports many researchers are providing important information to coaches and athletes in order to reach better performance in a shorter time. In swimming, these kinds of analyses are being used to evaluate, to detect and to improve the skills of high level athletes. Recently, evolutionary computing theories have been adopted to support swim velocity profile identification. Based on velocity profiles recognition, it is possible to identify distinct characteristics and classify swimmers according to their abilities. In this way, this work presents an application of Radial Basis Function Neural Network (RBF-NN) associated to a proposed cascaded evolutionary procedure composed by a genetic and Multiobjective Differential Evolution (MODE) algorithms as optimization method for searching the best fitness within a set of parameters to configure the RBF-NN. The main goal and novelty of the proposed approach is to enable, through the adoption of cascaded multiobjective optimization, the use of correlation based tests in order to select both the model lagged inputs and the associated parameters in a supervised fashion. Finally, the real data of a Brazilian elite female swimmer in crawl and breaststroke styles obtained into a 25 meters swimming pool have been identified by the proposed method. The soundness of the approach is illustrated with the adherence to the model validity tests and the values of the multiple correlation coefficients between 0.95 and 0.93 for two tests for both breaststroke and crawl strokes, respectively.

关键词： Sociology Correlation Optimization Genetic algorithms Time series analysis Training

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A study on the utilization of wind power turbines for a flywheel energy storage system using subway train traveling wind

A study on the utilization of wind power turbines for a flyw...

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14th International Conference on Civil, Structural and Environmental engineering Computing, CC 2013

作者： Im, J.-M. Shin, K.-B. Lee, D.-B. Graduate School of Mechanical Engineering Hanbat National University Dae-Jeon Korea Republic of Department of Mechanical Engineering Hanbat National University Dae-Jeon Korea Republic of Research Planning Team WOOJIN Industrial Systems Goesan-gun Korea Republic of

ISBN: (纸本)9781905088577

In this study, a flywheel energy storage system (FESS) with wind power turbine generating system which generates and stores electric power using travelling wind of urban train was developed. The travelling wind of a urban train was used to supply the initial power of the turbine generator while the vehicle is running. In order to obtain the optimal operating performance and inflow air velocity of the FESS, an air-intake of bell mouth type was chosen. The one-way bearing at the driving shaft was used to maintain the kinetic energy of the flywheel when the urban train is decelerated or stopped. This FESS has a 300W electric power capacity when it is driven at 700rpm and is designed to have more than 70% energy efficiency. The results show that the electric power stored in the FESS could supply auxiliary power for urban train components or service equipment such as mobiles, vending machines, and electric lights etc. © Civil-Comp Press, 2013.

关键词： Electric power systems

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Going in Circles: Key Aspects for Circular Economy Contributions to Agro-industrial Cooperatives

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Circular Economy and Sustainability 2023年第2期3卷 861-880页

作者： Barros, Murillo Vetroni de Jesus, Rômulo Henrique Gomes Ribeiro, Bruno Silva Piekarski, Cassiano Moro Sustainable Production Systems Laboratory (LESP) Graduate Program in Industrial Engineering (PPGEP) Universidade Tecnológica Federal Do Paraná (UTFPR) Paraná Ponta Grossa Brazil Department of Industrial Engineering Universidade Estadual do Paraná (UNESPAR) Paraná Paranaguá Brazil Sustainable Production Systems Laboratory (LESP) Universidade Tecnológica Federal Do Paraná (UTFPR) Paraná Ponta Grossa Brazil

The global agribusiness context faces at the same time challenges of feeding a growing global population that is used to safe and nutritious food, opportunities based on innovation, high technology and efficiency in the agri-food production systems from field to table. Given the context, this article aims to present the main key aspects of the circular economy to agro-industrial cooperatives. These contributions were named key aspects, such as circular and symbiotic practices, competitive advantages, innovation, cooperation and barriers and opportunities. The field presents a problem that few literature in fact discusses circular economy approaches in the context of agro-industrial cooperatives. As a methodological procedure, a literature review was carried out in three databases to obtain relevant documents and thus analyse and discuss some characteristics based on circular economy practices applied in agro-industrial cooperatives. As a result, a diagnosis of the current scenario that agro sector organizations are facing in terms of the main rural activities and sustainable practices that relate to the circular economy;measures taken to generate competitive advantage;innovation behaviour;and how linear and circular business models are being applied in the agroindustry. A framework is presented to show potential routes strategies for closing the cycle in an agro-industrial cooperative. The opportunities are based on the implementation of high technology in the field, the use of bioenergy and the development of new circular business models throughout the agro-value chain. The study has contributions to rural properties and managers of cooperatives in terms of waste reduction, innovation generation and increases in activities and processes based on circular economy. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Agro-industrial business Circular economy Circularity Cooperation Farm

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Comprehensive technical analysis of post-combustion carbon capture and storage based on monoethanolamine absorption for petrochemical industry in Indonesia

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Clean Energy 2024年第6期8卷 16-36页

作者： Muh Asyrofi Rahma Muthia Mohammad Akita Indianto Energy Systems Engineering Graduate Program Department of Interdisciplinary EngineeringFaculty of EngineeringUniversitas IndonesiaKampus Baru UI DepokDepokWest Java 16424Indonesia Department of Chemical Engineering Faculty of EngineeringUniversitas IndonesiaKampus Baru UI DepokDepokWest Java 16424Indonesia Sustainable Energy Systems and Policy Research Cluster Universitas IndonesiaKampus Baru UI DepokDepokWest Java 16424Indonesia Tropical Renewable Energy Center Faculty of EngineeringUniversitas IndonesiaKampus Baru UI DepokDepokWest Java 16424Indonesia

The implementation of carbon capture and storage in the petrochemical industry is one of the means of *** research focuses on a comprehensive technical analysis of the deployment of post-combustion carbon capture and storage based on monoethanolamine absorption in the petrochemical *** olefin complex petrochemical industry in Tuban,Indonesia,is the basis for the analysis,which includes a steam cracker,polyethylene,polypropylene,and raw pyrolysis gasoline hydrotreating units,with capacities of 1000,940,600,and 570 kilotons/year,*** total energy consumption is about 16024.53 GJ/h,and the CO_(2) emissions are about 1.6 megatons/*** on these plant systems,comprehensive technical analyses of the implementation of carbon capture and storage in that industry were performed using Aspen HYSYS®simulation *** analysis was carried out to determine the total CO_(2) captured,energy intensity,monoethanolamine consumption,and net CO_(2) captured in various scenarios based on the number of absorber column stages,absorption pressure,and desorption *** CO_(2) storage site is about 100 km away and is transported by an onshore pipeline with a supercritical phase of CO_(2).The optimal net CO_(2) capture value is achieved by setting up a 50-stage absorber column with a pressure of 1 barg and a temperature of 110℃ at the top of the desorber column,resulting in a CO_(2) capture yield of 86.4%and an energy intensity of 12.6 GJ/ton CO_(2).Under these conditions,the net CO_(2) captured in the scenario based on gas power plants’electricity is 0.225 megatons/year,while in the scenario based on gas power plants incorporating 30%biomass electricity,it is 0.544 megatons/*** increased use of renewable energy in carbon capture and storage facilities,more net CO_(2) is *** study can be applied to various cases of post-combustion carbon capture and storage implementation in the industrial sector,especially in the

关键词： carbon capture and storage petrochemical olefin monoethanolamine absorption pipeline injection energy intensity net captured CO_(2)

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PPM-HC: A method for helping project portfolio management based on topic hierarchy learnings

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International Journal of Business Intelligence and Data Mining 2021年第3期18卷 364-382页

作者： Pinto, Ricardo A.M. Bernardini, Flavia Marcacini, Ricardo M. Graduate Program in Industrial Engineering and Computing Systems Fluminense Federal University Jardim Bela Vista Rio das OstrasRJ Brazil Computing Institute Fluminense Federal University São Domingos NiteróiRJ Brazil Information Systems Federal University of Mato Grosso do Sul P.O. Box 210 Três LagoasMS Brazil

The projects categorisation is a crucial step in the project portfolio management (PPM). Categorising projects allows the organisation to identify categories with a lack or excess of projects, according to its strategic objectives. In this work, we present a new method for project portfolio management based on hierarchical clustering (PPM-HC) to organise the projects at several levels of abstraction. In the PPM-HC, similar projects are allocated to the same clusters and subclusters. PPM-HC automatically learns an understandable topic hierarchy from the project portfolio dataset, thereby facilitating the (human) task of exploring, analysing and prioritising the projects of the organisation. We also proposed a card sorting-based technique which allows the evaluation of the projects categorisation using an intuitive visual map. We carried out an experimental evaluation based on a benchmark dataset and we also presented a real-world case study. The results show that the proposed PPM-HC method is promising. © 2021 Inderscience Enterprises Ltd.

关键词： Investments

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Strategies for integrating service-learning into the engineering core at the university of Massachusetts Lowell and the Massachusetts institute of technology

Strategies for integrating service-learning into the enginee...

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113th Annual ASEE Conference and Exposition, 2006

作者： Banzaert, Amy Duffy, John Wallace, David Massachusetts Institute of Technology United States MIT's Mechanical Engineering Department University of Massachusetts Lowell United States Mechanical Engineering Department Solar Engineering Graduate Program Center for Sustainable Energy University of Massachusetts Lowell United States Department of Mechanical Engineering MIT United States MIT Computer-aided Design Laboratory

While the pedagogy of Service-Learning (S-L) has been applied beneficially in a variety of disciplines, only recently have engineering departments begun to adopt the practice of integrating academically-relevant community service projects into classes and, in doing so, it is most common to offer service-oriented projects in elective classes. However, the University of Massachusetts Lowell and the Massachusetts Institute of Technology have independently begun to develop S-L programs in engineering fields that work specifically to use the pedagogy in the core curriculum of the discipline. While the two universities and educational programs are distinct, the approach to S-L has been reasonably similar, and faculty and staff from each school have used common tools and methods to assess certain aspects of the integration from student and faculty perspectives. From surveys used at both of the schools (almost 760 pre-surveys and 680 post-surveys administered in the 04-05 academic year), a key finding was that student opinion changed significantly regarding the relationship between engineering and societal problems;students developed the belief that engineers should apply their skills to solve social problems. Additionally, both institutions surveyed the engineering faculty about their attitudes toward S-L and found the majority of faculty showed considerable interest in the concept. Overall, these findings show promise for integrating S-L into core engineering curriculums. © American Society for engineering Education, 2006.

关键词： Learning systems

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Power Demand Forecast Using Least-Squares Support Vector Machines

Power Demand Forecast Using Least-Squares Support Vector Mac...

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International Conference on Intelligent systems Applications to Power systems (ISAP)

作者： Leandro dos Santos Coelho Carlos Eduardo Klein Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paraná Curitiba Parana Brazil

This paper aims to share the results on forecasting power demand using least-squares support vector machines. The development is based on model estimation taking in consideration the past measurements for power demand and ambient temperature. All approximated models were evaluated using the multiple correlation coefficient (R 2 ) or mean absolute percentage error (MAPE) and maximum error combined as quality parameters.

关键词： Power demand Demand forecasting Support vector machines Power system modeling Temperature Power generation Power engineering and energy systems engineering and theory Power measurement System identification

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THE INTEGRITY OF THE PROCESS APPROACH APPLICATION BY THE P3TECH TECHNOLOGY USAGE

THE INTEGRITY OF THE PROCESS APPROACH APPLICATION BY THE P3T...

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The Eighth World Conference on Integrated Design & Process Technology

作者： W.S.Bonfim E.P.De Lima S.E.G.Da Costa Production and Systems Engineering Graduate Program Pontifical Catholic University of Parana Curitiba Brazil Production and Systems Engineering Graduate Program Pontifical Catholic University of Parana Curitiba Brazil Production and Systems Engineering Graduate Program Pontifical Catholic University of Parana Curitiba Brazil

The Process Approach is a method to solving problems in Operations Strategy Management (OMS).This method drives the conception and development of an operationalization process of conceptualframeworks,

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Design and analysis of component for non-rotor unmanned aerial vehicle 6

Design and analysis of component for non-rotor unmanned aeri...

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6th International Conference on Precision Machinery and Manufacturing Technology, ICPMMT 2021

作者： Shiau, Y.R. Fang, J. Chen, Y.L. Department of Industrial Engineering and Systems Management Feng Chia University Taichung407 Taiwan Department of Aerospace and Systems Engineering Feng Chia University Taichung407 Taiwan Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung407 Taiwan

Unmanned aerial vehicles (UAVs) are widely applied in various industries and fields. Because they use a variety of rotor types, from single rotors to multi-rotors, UAVs offer a wide array of functions. However, continuously rotating rotors can be dangerous if they accidentally encounter foreign objects or bare hands. Therefore, non-rotor UAVs are the focus of discussion and modification in the present study. Non-rotor UAVs do not contain visible rotor mechanical components. Compared with the development of popularized multirotor UAVs, that of non-rotor UAVs is challenging in terms of structure and flight control. To address this challenge, wind tunnel structure models were developed in this study for different levels of aerodynamic force, and computer-aided engineering was used to conduct structural and flow field analyses to determine the key elements that reinforce non-rotor UAV structures. The research results revealed that the thickness and fillet design at the joint of the non-rotor UAV aerodynamic wind tunnel system were crucial factors influencing the system's performance. Motor rotors can be embedded inside support structures to reduce airflow turbulence in the wind tunnel. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Wind tunnels

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