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IEEE Congress on Evolutionary Computation

作者： Dos Santos Coelho, Leandro De Andrade Bernert, Diego Luis Mariani, Viviana Cocco Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paran Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil Department of Mechanical Engineering PPGEM Pontifical Catholic University of Paran Imaculada Conceição 1155 80215-901 Curitiba Paran Brazil

ISBN: (纸本)9781424478347

The reliability-redundancy allocation problem can be approached as a mixed-integer programming problem. It has been solved by using optimization techniques such as dynamic programming, integer programming, and mixed-integer nonlinear programming. On the other hand, a broad class of meta-heuristics has been developed for reliability-redundancy optimization. Recently, a new meta-heuristics called firefly algorithm (FA) algorithm has emerged. The FA is a stochastic metaheuristic approach based on the idealized behavior of the flashing characteristics of fireflies. In FA, the flashing light can be formulated in such a way that it is associated with the objective function to be optimized, which makes it possible to formulate the firefly algorithm. This paper introduces a modified FA approach combined with chaotic sequences (FAC) applied to reliability-redundancy optimization. In this context, an example of mixed integer programming in reliability-redundancy design of an overspeed protection system for a gas turbine is evaluated. In this application domain, FAC was found to outperform the previously best-known solutions available. © 2011 IEEE.

关键词： Integer programming

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A Harmony search algorithm combined with differential operator applied to reliability-redundancy optimization

A Harmony search algorithm combined with differential operat...

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2009 IEEE International Conference on systems, Man and Cybernetics, SMC 2009

作者： Dos Santos Coelho, Leandro De Andrade Bernert, Diego Luis Mariani, Viviana Cocco Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paraná Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil Department of Mechanical Engineering PPGEM Pontifical Catholic University of Paraná Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil

ISBN: (纸本)9781424427949

The reliability-redundancy allocation problem can be approached as a mixed-integer programming problem. It has been solved by using optimization techniques such as dynamic programming, integer programming, and mixed-integer nonlinear programming. On the other hand, a broad class of meta-heuristics has been developed for reliability-redundancy optimization. Recently, a new meta-heuristics called harmony search (HS) algorithm has emerged. HS was conceptualized using an analogy with music improvisation process where music players improvise the pitches of their instruments to obtain better harmony. This paper introduces a modified HS approach combined with an operator of differential evolution - a paradigm of evolutionary computation - to solve optimization problems in reliability engineering. In this context, an example of mixed integer programming in reliability-redundancy design of an over-speed protection system for a gas turbine is evaluated. In this application domain, HS was found to outperform the previously best-known solutions available. ©2009 IEEE.

关键词： Integer programming

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Optimization of broaching design

Optimization of broaching design

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IIE Annual Conference and Expo 2007 - Industrial engineering's Critical Role in a Flat World

作者： Özelkan, Ertunga C. Öztürk, Özkan Budak, Erhan Engineering Management Program Center for Lean Logistics and Engineered Systems University of North Carolina at Charlotte Charlotte NC 28223 United States Department of Mechanical Engineering Center for Precision Metrology University of North Carolina at Charlotte Charlotte NC 28223 United States Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

Broaching is one of the most recognized machining processes that can yield high productivity and high quality when applied properly. One big disadvantage of broaching is that all process parameters, except cutting speed, are built into the broaching tools. Therefore, it is not possible to modify the cutting conditions during the process once the tool is manufactured. Optimal design of broaching tools has a significant impact to increase the productivity and to obtain high quality products. In this paper, an optimization model for broaching design is presented. The model results in a non-linear non-convex optimization problem. Analysis of the model structure indicates that the model can be decomposed into smaller problems. The model is applied on a turbine disc broaching problem which is considered as one of the most complex broaching operations.

关键词： Machining

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Soil resistivity study and simulation with finite elements method 16

Soil resistivity study and simulation with finite elements m...

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16th International Conference on Environment and Electrical engineering, EEEIC 2016

作者： Pereira, Thiago Martins De Lima, Rodrigo Alves Gomes, Viviane Margarida Gutembergue, Sostenes Alves, Aylton Jose Calixto, Wesley Pacheco Electrical Mechanical and Computer Engineering School EMC Federal University of Goias UFG Brazil Experimental and Technological Research and Study Group NExT Federal Institute of Goias IFG Brazil Program in Electronic Systems and Automation PGEA University of Brasilia UnB Brazil

ISBN: (纸本)9781509023196

This work purpose is to study the influence of concrete buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons and soil electrical behavior was carried out. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest. © 2016 IEEE.

关键词： Finite element method

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Experimental Study on Mechanisms of Buckling and Kink-band Formation in Graphene Nanosheets

Experimental Study on Mechanisms of Buckling and Kink-band F...

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2014 2nd International Conference on Materials Science,Machinery and Energy engineering(MSMEE 2014)

作者： C.C.Wen T.W.Chang W.S.Kuo Ph.D.Program in Mechanical and Aeronautical Engineering Feng-Chia University Department of Aerospace and Systems Engineering Feng-Chia University

This work examines buckling and kink-band formation in graphene nanosheets(GNSs).GNSs are nano-scale flakes composed of graphene *** graphite was first made, which can be torn apart into GNSs by sonication.A simple but effective approach was adopted to incur buckling in *** observations revealed three major modes: the kinking induced by bending, the bulging, and the kink-band caused by in-plane *** conditions to cause these modes are *** buckled, the graphene layers undergo sharp ***, the graphene layers can survive kinking without fracture due to their exceptional *** kink-band in GNSs resembles the kink-band in carbon-fiber ***, the scale, the material properties, the micro-structures, and the energy terms involved in forming the kink-band are different.

关键词： Nanosheets(GNSs) Buckling Kink-band

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A robotic and virtual testing platform highlighting the promise of soft wearable actuators for wrist tremor suppression

Device

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Device 2025年

作者： Alona Shagan Shomron Christina Chase-Markopoulou Johannes R. Walter Johanna Sellhorn-Timm Yitian Shao Tobias Nadler Audrey Benson Isabell Wochner Ellen H. Rumley Isabel Wurster Philipp Klocke Daniel Weiss Syn Schmitt Christoph Keplinger Daniel F.B. Haeufle Robotic Materials Department Max Planck Institute for Intelligent Systems Stuttgart Germany Institute for Modelling and Simulation of Biomechanical Systems University of Stuttgart Stuttgart Germany Stuttgart Center for Simulation Science (SimTech) University of Stuttgart Stuttgart Germany Hertie Institute for Clinical Brain Research University of Tübingen Tübingen Germany Haptic Intelligence Department Max Planck Institute for Intelligent Systems Stuttgart Germany Institute for Computer Engineering (ZITI) University of Heidelberg Heidelberg Germany Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder CO USA Center for Neurology Department of Neurodegenerative Diseases University of Tübingen Tübingen Germany Center for Bionic Intelligence (BITS) Tübingen and Stuttgart Germany Material Science and Engineering Program University of Colorado Boulder CO USA Werner Reichardt Center for Integrative Neuroscience University of Tübingen Tübingen Germany

Nearly 80 million people in the world deal with medical conditions that cause involuntary periodic movements known as tremors. Wearable soft robotic devices offer a potential solution for actively suppressing these tremors. However, existing prototypes face limitations in actuation performance and complex testing procedures. We present a comprehensive approach for the rapid evaluation of emerging wearable tremor-suppression technologies. This method combines reproducing patient-recorded tremor episodes and measuring tremor suppression in a robotic platform, termed a “mechanical patient”, with validation of the achieved suppression performance of soft actuators via biomechanical modeling, thereby avoiding time-consuming clinical testing in the early stages of development. Using this approach, we highlight that an antagonistic pair of slim and lightweight electrohydraulic actuators can effectively suppress clinically relevant tremors between 2 and 8 Hz. The biomechanical model confirms that the pair of actuators generates adequate suppression forces for all tested tremors.

关键词： tremor suppression mechanical patient soft actuators wearable devices biomechanical simulation DTI-4: Validate

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An evaluation system for distance determination using the repetition interval of a femtosecond optical frequency comb

An evaluation system for distance determination using the re...

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International Conference on Quantum Electronics (IQEC)

作者： Dong Wei Kiyoshi Takamasu Hirokazu Matsumoto Global COE Program Mechanical Systems Innovation School of Engineering University of Tokyo Japan Department of Precision Engineering University of Tokyo Japan

A gauge block evaluation system was developed and its uncertainty estimation was performed for distance determination using the repetition interval of a femtosecond optical frequency comb - the national standard tool ... 详细信息

ISBN: (纸本)9780977565771

关键词： Length measurement Uncertainty Ultrafast optics Optical interferometry Interference Frequency domain analysis

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Estimating the effect of chirality and size on the mechanical properties of carbon nanotubes through finite element modelling 12

Estimating the effect of chirality and size on the mechanica...

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ASME 2014 12th Biennial Conference on engineering systems Design and Analysis, ESDA 2014

作者： Zuberi, Muhammad Jibran Shahzad Esat, Volkan Sustainable Environment and Energy Systems Middle East Technical University Northern Cyprus Campus Kalkanli Guzelyurt Mersin10 Turkey Mechanical Engineering Program Middle East Technical University Northern Cyprus Campus Kalkanli Guzelyurt Mersin10 Turkey

ISBN: (纸本)9780791845837

Carbon nanotubes (CNTs) are considered to be one of the contemporary materials exhibiting superior mechanical, thermal and electrical properties. A new generation state-of-theart composite material, carbon nanotube reinforced polymer (CNTRP), utilizes carbon nanotubes as the reinforcing fibre element. CNTRPs are highly promising composite materials possessing the potential to be used in various areas such as automotive, aerospace, defence, and energy sectors. The CNTRP composite owes its frontline mechanical material properties mainly to the improvement provided by the CNT filler. There are challenging issues regarding CNTRPs such as determination of material properties, and effect of chirality and size on the mechanical material properties of carbon nanotube fibres, which warrant development of computational models. Along with the difficulties associated with experimentation on CNTs, there is paucity in the literature on the effects of chirality and size on the mechanical properties of CNTs. Insight into the aforementioned issues may be brought through computational modelling time- and cost-effectively when compared to experimentation. This study aims to investigate the effect of chirality and size of single-walled carbon nanotubes (SWNTs) on its mechanical material properties so that their contribution to the mechanical properties of CNTRP composite may be understood more clearly. Nonlinear finite element models based on molecular mechanics using various element types substituting C-C bond are generated to develop zigzag, armchair and chiral SWNTs over a range of diameters. The predictions collected from simulations are compared to the experimental and computational studies available in the literature. Copyright © 2014 by ASME.

关键词： Finite element method

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RECRUITING AND TRAINING THE FUTURE WORKFORCE IN ADVANCED MANUFACTURING CAPABILITIES: A CASE STUDY FROM THE TAMPA BAY

RECRUITING AND TRAINING THE FUTURE WORKFORCE IN ADVANCED MAN...

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ASME 2024 International mechanical engineering Congress and Exposition, IMECE 2024

作者： Amjad, Muhammad Saad Singh, Pallavi Zapata, Valerie Barger, Marilyn Diaz-Elsayed, Nancy Smart and Sustainable Systems Laboratory Department of Mechanical Engineering University of South Florida TampaFL33620 United States Department of Electrical Engineering University of South Florida TampaFL33620 United States Florida Advanced Technological Education Center TampaFL33619 United States Introduction to Production Systems Certificate Program College of Engineering University of South Florida TampaFL33620 United States

ISBN: (纸本)9780791888650

The manufacturing sector is of paramount importance to a nation’s economy, as it creates employment opportunities, fosters innovation and enhances the competitive advantage in global markets. With the introduction of smart manufacturing technologies, the manufacturing sector has been able to boost its production performance, however, there is a skill gap that the manufacturing sector is facing when it comes to hiring a trained workforce. The US National Strategy for Advanced Manufacturing has underlined the importance of training an advanced manufacturing workforce with an opportunity to support historically underrepresented and underserved communities. We report the outcomes of a manufacturing training certificate program that is designed to provide equitable opportunities for high-quality, industry-relevant training that can lead to sustainable employment and economic growth. A holistic curriculum was developed to teach manufacturing education including CAD, CAM, 3D printing, AR/VR technologies, robotics and automation, assembly and production lines, and measurement systems. We report the outcomes of two cohorts that graduated in Summer 2023 and Fall 2023, in which a total of 86 training sessions were conducted. Twenty-five students enrolled and 17 students (14 males and 3 females) graduated across the two cohorts - among the graduates 47% identified as Hispanic or Latino, 41% identified as African American, and the rest identified as non-white/Hispanic;16 of the graduates belonged to the low-to-middle income category. In the future, the program can be further expanded to include on the job training opportunities with local employers. We also provide recommendations to improve the learning experience of the students and enhance participation in the program. © 2024 American Society of mechanical Engineers (ASME). All rights reserved.

关键词： Students

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Analysis of the motivations for ISO 9001:2015 adoption in the Brazilian business context

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Quality Management Journal 2021年第2期28卷 76-85页

作者： Siltori, Patricia F. S. Rampasso, Izabela Simon Martins, Vitor W. B. Anholon, Rosley Silva, Dirceu Souza Pinto, Jefferson Leal Filho, Walter School of Mechanical Engineering University of Campinas Campinas Brazil PNPD/CAPES Program Doctoral Program in Sustainable Management Systems Federal Fluminense University Niterói Brazil Department of Production Engineering State University of Pará Belém Brazil Faculty of Education University of Campinas Campinas Brazil Federal Institute of São Paulo Bragança Paulista Brazil Faculty of Life Sciences Hamburg University of Applied Sciences Hamburg Germany

This study aims to analyze the reasons that motivate Brazilian companies to implement Quality Management systems, according to ISO 9001:2015 requirements. Based on information collected in the literature, a questionnaire was developed and answered by professionals that work with the mentioned standard in their companies. An Exploratory Factor Analysis was conducted with the collected data to group the validated variables into two constructs that present the most part of information variance. These constructs were entitled “internal improvements related motives” and “market related motives”. The findings of this research confirm and complement previous studies performed in Brazil and in other countries. © 2021 American Society for Quality.

关键词： Adoption motives ISO 9001 motivation quality management

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