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113th Annual ASEE Conference and Exposition, 2006

作者： Bachnak, Rafle Caruso, Korinne Esparza, Jack Méndez, Marc Texas A and M University Corpus Christi United States United States FUSE Texas A and M University - Corpus Christi Mechanical Engineering Technology Program United States Texas A and M University - Corpus Christi Control Systems Engineering Technology Program United States Texas A and M University-Corpus Christi Corpus Christi TX 78412 United States

Summer workshops to attract local area high school students to science and engineering careers have been conducted at Texas A&M-Corpus Christi for the last three years. These workshops are designed to improve the recruitment of underrepresented students in science, engineering, and technology by introducing them to college life, involve them in hands-on activities, and offering them network opportunities. Our goal is to make the activities of this project an integral part of the recruiting and training efforts and expand them to reach a larger geographical area and a higher number of underrepresented students. This paper will describe the program and present some results. © American Society for engineering Education, 2006.

关键词： engineering education

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Computational simulation of shock oscillation around a supersonic air-intake

Computational simulation of shock oscillation around a super...

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36th AIAA Fluid Dynamics Confernce

作者： Nishizawa, Uichi Kameda, Masaharu Watanabe, Yasushi Tokyo University of Agriculture and Technology Tokyo Japan Japan Aerospace Exploration Agency Tokyo Japan Department of Mechanical Systems Engineering Koganei Tokyo 184-8588 Japan Aviation Program Group Mitaka Tokyo 182-8522 Japan AIAA

ISBN: (纸本)1563478102

Unsteady flow around an external-compression air intake was Investigated numerically. Our attention was focused to shock oscillation, which is known as 'buzz', in subcritical operation. We used a two-dimensional model consisting of a wedge and a subsonic diffuser. A slit was opened for natural bleed at the entrance of the subsonic duct. The wedge angle was 10 degrees. The free stream Mach number was 1.64. Compressible viscous flow around the model was calculated using UPACS (Unified Platform for Aerospace Computational Simulation) developed at JAXA (Japan Aerospace Exploration Agency). We successfully simulated a series of flow pattern (supercritical, critical, and subcritical operations) by changing the intake mass flow rate. In the subcritical operation, multiple dominant frequencies were found in the pressure fluctuation with the buzz. Low-frequency component was caused by the acoustic resonance of the subsonic diffuser. On the other hand, high-frequency component was generated by the periodic flow separation on the wedge. This phenomenon was caused by the periodic suction of the separated air through the slit. The high-frequency component disappeared when the diffuser length was long. The natural bleed slightly suppressed the pressure fluctuation in the subsonic diffuser in a constant mass flow rate through the diffuser.

关键词： Supersonic flow

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AUTOMATED MODULAR FIXTURE PLANNING: ACCURACY, CLAMPING, AND ACCESSIBILITY ANALYSIS

AUTOMATED MODULAR FIXTURE PLANNING: ACCURACY, CLAMPING, AND ...

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ASME 1997 International mechanical engineering Congress and Exposition, IMECE 1997 - Manufacturing Science and engineering

作者： Wu, Yufeng Rong, Yiming Ma, Weidong LeClair, Steven R. Department of Mechanical and Industrial Engineering University of Illinois Urbana-Champaign United States Manufacturing Systems Program Southern Illinois University Carbondale United States Materials Directorate Wright Laboratory Wright-Patterson Air Force Base United States

ISBN: (纸本)9780791826799

Automated fixture design has become a research focus in process planning and CAD/CAM integration. An automated fixture configuration design system has been developed where when fixturing surfaces and points are specified, modular fixture components can be automatically selected and placed into position with satisfying assemble conditions. A geometric analysis has been conducted to determine the fixturing surfaces and points which provide feasible geometric constraints and assembly relationships with modular fixtures. This paper presents analyses on fixturing accuracy, clamp planning, fixturing accessibility, and clamping stability. When a fixture planning is determined, the analysis results can be applied to verify the performance of the fixture design. © 1997 American Society of mechanical Engineers (ASME). All rights reserved.

关键词： Fixtures (tooling)

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A Comparative Hardware Implementation of Histogram of Oriented Gradients as a Descriptor in Embedded Tracking of Swarm

SSRN

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SSRN 2023年

作者： Legarda, Diego Antonio Pérez, Karen Viviana Muñoz, Daniel Mauricio Department of Mechanical Engineering Mechatronics Systems Graduate Program University of Brasilia DF Brasilia70910-900 Brazil

The Histogram of Oriented Gradients (HOG) algorithm is widely utilized in image processing for tasks such as detection, classification, and tracking. However, several challenges arise when implementing this algorithm on computing platforms with limited memory and low power consumption, such as mobile robots and drones. This work presents an in-depth analysis and implementation of three innovative hardware architectures for HOG, specifically designed for real-time processing using Field programmable Gate Arrays (FPGAs) in the context of mobile robot localization. The primary focus of these architectures is to simplify the processing operations involved in gradient magnitude and orientation calculation, histogram generation, and normalization. These simplifications lead to a reduction in resource utilization and energy consumption. Experimental results conducted on a Zynq 7020 device demonstrated minimal relative error values throughout the en-Email addresseslegarda8027@*** (Diego Legarda), kperezlujan@*** (Karen Ṕerez), damuz@*** (Daniel M. Muñoz) 1Corresponding authorPreprint submitted to Journal of Parallel and Distributed Computing. July 31, 2023tire process, along with a significant execution time improvement of over 1000 times when compared to the software-based solution. © 2023, The Authors. All rights reserved.

关键词： Mobile robots

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Cauchy particle swarm optimization with dynamic adaptation applied to inverse heat transfer problem

Cauchy particle swarm optimization with dynamic adaptation a...

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2010 IEEE International Conference on systems, Man and Cybernetics, SMC 2010

作者： Mariani, Viviana Cocco Neckel, Vagner Jorge Grebogi, Rafael Bartnik Dos Santos Coelho, Leandro Department of Mechanical Engineering PPGEM Pontifical Catholic University of Paraná Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paraná Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil

ISBN: (纸本)9781424465880

The particle swarm optimization (PSO) algorithm is a member of the wide category of swarm intelligence methods for solving global optimization problems. Its basic idea is the simulation of simplified animal social behaviors such as fish schooling and bird flocking. PSO algorithms are attracting attentions in recent years, due to their ability of keeping good balance between convergence and diversity maintenance. Several attempts have been made to improve the performance of the original PSO algorithm. In this paper, a modified version of the original PSO based on Cauchy distribution and dynamic adaptation of inertia factor, named modified PSO (MPSO), is proposed. to estimate the unknown variables of an inverse heat transfer problem. To validate the optimization performance of the proposed MPSO, an inverse heat transfer problem is illustrated and the algorithm has to estimate its unknown variables. The results testify that the MPSO can perform well in an inverse heat transfer problem. ©2010 IEEE.

关键词： Heat transfer

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A normative differential evolution approach for estimation of heat transfer coefficient during freezing treatment by inverse analysis

A normative differential evolution approach for estimation o...

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IEEE Congress on Evolutionary Computation

作者： Mariani, Viviana Cocco Klein, Carlos Eduardo Luvizotto, Luiz Guilherme Justi Dos Santos Coelho, Leandro Department of Mechanical Engineering PPGEM Pontifical Catholic University of Paran Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paraná Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil

ISBN: (纸本)9781424478347

Among the existing meta-heuristic optimization algorithms, a well-known branch is the differential evolution (DE). DE is a powerful population-based algorithm of evolutionary computation field designed for solving global optimization problems which only has a few control parameters. With an eye to improve the performance of DE, in this paper, a DE approach combined with a cultural algorithm technique based on normative knowledge (NDE) is investigated to estimate the heat transfer coefficient during freezing treatment by inverse analysis. Numerical results for inverse heat transfer problem demonstrate the applicability and efficiency of the NDE algorithm. In this application, NDE approach outperforms a classical DE approach in terms of quality of solution. © 2011 IEEE.

关键词： Inverse problems

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A chaotic firefly algorithm applied to reliability-redundancy optimization

A chaotic firefly algorithm applied to reliability-redundanc...

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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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