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16th Genetic and Evolutionary Computation Conference Companion, GECCO 2014 Companion

作者： De, Emerson Hochsteiner Segundo, Vasconcelos Neto, Gabriel Fiori Da Silva, Andre Mendes Mariani, Viviana Cocco Dos Santos Coelho, Leandro Mechanical Eng. Grad. Program Pontifical Catholic University of Parana Curitiba PR Brazil Curitiba PR Brazil Mechatronics Engineering Undergraduate Program Pontifical Catholic University of Parana Curitiba PR Brazil Mechanical Engineering Graduate Program Pontifical Catholic University of Parana and Electrical Engineering Federal University of Parana Curitiba PR Brazil Industrial and Systems Eng. Graduate Program Pontifical Catholic University of Parana and Electrical Engineering Federal University of Parana Curitiba PR Brazil

ISBN: (纸本)9781450328814

The gravitational search algorithm (GSA) is a stochastic population-based metaheuristic inspired by the interaction of masses via Newtonian gravity law. In this paper, we propose a modified GSA (MGSA) based on logarithm and Gaussian signals for enhancing the performance of standard GSA. To evaluate the performance of the proposed MGSA, well-known benchmark functions in the literature are optimized using the proposed MGSA, and provides comparisons with the standard GSA.

关键词： Optimization

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Erratum to: Influence of Cyclic Straining on Fatigue, Deformation, and Fracture Behavior of High-Strength Alloy Steel

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Journal of Materials engineering and Performance 2015年第1期25卷 151-151页

作者： K. Manigandan T. S. Srivatsan V. K. Vasudevan D. Tammana B. Poorganji Department of Mechanical Engineering The University of Akron Akron USA School of Dynamic Systems Materials Science and Engineering Program University of Cincinnati Cincinnati USA

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Cyclic strain resistance, deformation and fracture behavior of a novel alloy steel 3

Cyclic strain resistance, deformation and fracture behavior ...

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3rd Biennial Symposium on Fatigue of Materials: Advances and Emergences in Understanding, held during Materials Science and Technology 2014, MS and T 2014

作者： Manigandan, K. Srivatsan, T.S. Vasudevan, V.K. Tammana, D. Poorbangi, B. Division of Materials Science and Engineering Department of Mechanical Engineering University of Akron AkronOH44325-3903 United States School of Dynamic Systems Materials Science and Engineering Program University of Cincinnati CincinnatiOH45221-0072 United States

ISBN: (纸本)9781119041481

In this paper, the results of a study on microstructural influences on cyclic strain response, deformation and fracture behavior of an alloy steel is presented Cyclic strain resistance exhibited a linear trend for the variation of both elastic strain amplitude with reversals-to-failure, and plastic strain amplitude with reversals-to-failure. Fracture morphology was observed to be the same at the macroscopic level over the entire range of cyclic strain amplitudes examined. However, at the fine microscopic level this alloy steel revealed fracture to be mixed-mode with features reminiscent of "locally" ductile and brittle failure mechanisms. The mechanisms governing strain response at the fine microscopic level, resultant fatigue life, and final fracture behavior are presented and discussed in light of the mutually interactive influences of intrinsic microstructural effects, deformation characteristics of the microstructural constituents during fully-reversed strain cycling, magnitude of cyclic strain amplitude, and resultant fatigue life.

关键词： Alloy steel

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Integrating artificial neural networks and cluster analysis to assess energy efficiency of buildings

Integrating artificial neural networks and cluster analysis ...

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IIE Annual Conference and Expo 2014

作者： Aqlan, Faisal Ahmed, Abdulaziz Srihari, Krishnaswami Khasawneh, Mohammad T. Industrial and System Engineering Program Department of Mechanical Civil and Environmental Engineering University of New Haven West HavenCT06516 United States Department of Systems Science and Industrial Engineering State University of New York at Binghamton BinghamtonNY13902 United States

ISBN: (纸本)9780983762430

Energy consumption of buildings worldwide has steadily increased over the past couple of decades. Furthermore, energy performance of buildings is one of the factors that contribute to energy waste and its perennial adverse impact on the environment. This paper presents a data mining approach for assessing the heating and cooling requirements of residential buildings. The proposed approach combines Artificial Neural Networks (ANNs) and cluster analysis to assess and predict the heating and cooling energy efficiency of residential buildings. The ANN-based model uses eight input variables (i.e., relative compactness, surface area, wall area, roof area, overall height, orientation, glazing area, and glazing area distribution) to predict both the heating and cooling loads of residential buildings. Buildings are then clustered based on the output variables using the K-means clustering method. The proposed approach is used to assess and evaluate 768 diverse residential buildings based on simulated literature data. The research results showed that the proposed approach can effectively predict the heating and cooling requirements of residential buildings based on the input variables considered with a very high level of accuracy.

关键词： Energy efficiency

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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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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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Bat-inspired optimization approach applied to Jiles-Atherton hysteresis parameters tuning 14

Bat-inspired optimization approach applied to Jiles-Atherton...

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16th Genetic and Evolutionary Computation Conference Companion, GECCO 2014 Companion

作者： Dos Santos Coelho, Leandro Da Silva, Andre Mendes Mariani, Viviana Cocco Batistela, Nelson Jhoe Ayala, Helon Vicente Hultmann Leite, Jean Vianei Industrial and Systems Eng. Grad. Program Pontifical Catholic University of Parana and Electrical Engineering Federal University of Parana Curitiba PR Brazil Mechatronics Eng. Undergraduate Program Pontifical Catholic University of Parana Curitiba PR Brazil Mechanical Eng. Grad. Program Pontifical Catholic University of Parana and Electrical Engineering Federal University of Parana Curitiba PR Brazil Florianopolis SC Brazil Curitiba PR Brazil

ISBN: (纸本)9781450328814

Recently, it was proposed a new metaheuristic optimization approach namely bat algorithm (BA), which is based on the fascinating capability of microbats in to find their prey and discriminate different types of insects even in complete darkness. In this paper, we introduce a novel enhanced hybrid approach combining BA with a mutation style operator from differential evolution and beta probability distribution (BADEBD) and report its performance on to identification of the 10 hysteresis parameters for the 2-dimensional Jiles-Atherton hysteresis modeling to a material under rotational excitation. Compared with the classical BA, the proposed BADEBD performs better in terms of the solution accuracy and the convergence rate.

关键词： Hysteresis

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Sliding mode control for a class of underactuated systems using feedforward normal form: A slosh-container system

Sliding mode control for a class of underactuated systems us...

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International Workshop on Variable Structure systems, VSS

作者： Parth S Thakar B. Bandyopadhyay P. S. Gandhi Interdisciplinary Program in Systems and Control Engineering IIT Bombay Mumbai Maharashtra India Department of Mechanical Engineering IIT Bombay Mumbai Maharashtra India

This paper deals with the design of stable sliding mode control (SMC) for the underactuated slosh-container system using feedforward normal form. A nonlinear coordinate transformation is used to convert the system into so called feedforward normal like form to decouple the control input appearing in one of the degree of freedom (DOF). This results in the design simplicity for the sliding mode control as well as the equivalent control and reduced order system derivation and its stability analysis. The range of surface parameters to provide the stable sliding motion for the system using proposed scheme, is also large compared to our earlier results. Simulation results are also presented to illustrate the proposed method.

关键词： Mathematical model Containers Equations Feedforward neural networks Vehicle dynamics Liquids Sliding mode control

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Time-stepping approach for solving upper-bound problems: Application to two-dimensional Rayleigh-Bénard convection

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Physical Review E 2015年第4期92卷 043012-043012页

作者： Baole Wen Gregory P. Chini Rich R. Kerswell Charles R. Doering Program in Integrated Applied Mathematics University of New Hampshire Durham New Hampshire 03824 USA Center for Fluid Physics University of New Hampshire Durham New Hampshire 03824 USA The Institute for Computational Engineering and Sciences The University of Texas at Austin Austin Texas 78712 USA Department of Mechanical Engineering University of New Hampshire Durham New Hampshire 03824 USA School of Mathematics University of Bristol University Walk Bristol BS8 1TW United Kingdom Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Department of Mathematics University of Michigan Ann Arbor Michigan 48109-1043 USA Center for the Study of Complex Systems University of Michigan Ann Arbor Michigan 48109-1107 USA

An alternative computational procedure for numerically solving a class of variational problems arising from rigorous upper-bound analysis of forced-dissipative infinite-dimensional nonlinear dynamical systems, including the Navier-Stokes and Oberbeck-Boussinesq equations, is analyzed and applied to Rayleigh-Bénard convection. A proof that the only steady state to which this numerical algorithm can converge is the required global optimal of the relevant variational problem is given for three canonical flow configurations. In contrast with most other numerical schemes for computing the optimal bounds on transported quantities (e.g., heat or momentum) within the “background field” variational framework, which employ variants of Newton's method and hence require very accurate initial iterates, the new computational method is easy to implement and, crucially, does not require numerical continuation. The algorithm is used to determine the optimal background-method bound on the heat transport enhancement factor, i.e., the Nusselt number (Nu), as a function of the Rayleigh number (Ra), Prandtl number (Pr), and domain aspect ratio L in two-dimensional Rayleigh-Bénard convection between stress-free isothermal boundaries (Rayleigh's original 1916 model of convection). The result of the computation is significant because analyses, laboratory experiments, and numerical simulations have suggested a range of exponents α and β in the presumed Nu∼PrαRaβ scaling relation. The computations clearly show that for Ra≤1010 at fixed L=22,Nu≤0.106Pr0Ra5/12, which indicates that molecular transport cannot generally be neglected in the “ultimate” high-Ra regime.

关键词： RAYLEIGH-Benard convection RESEARCH BOUNDS (Mathematics) CONVECTIVE flow (Fluid dynamics) NATURAL heat convection NUSSELT number

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An ergonomic study for 6s workplace improvement

An ergonomic study for 6s workplace improvement

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IIE Annual Conference and Expo 2014

作者： Aqlan, Faisal Lam, Sarah S. Ramakrishnan, Sreekanth Testani, Michael Industrial and System Engineering Program Department of Mechanical Civil and Environmental Engineering University of New Haven West HavenCT06516 United States Department of Systems Science and Industrial Engineering State University of New York at Binghamton BinghamtonNY13902 United States IBM Corporation WalthamMA02451 United States IBM Corporation EndicottNY13760 United States

ISBN: (纸本)9780983762430

This paper presents a workplace ergonomic study in a high-end server manufacturing environment to assess ergonomics risks and enhance the Lean transformation. Operators perform heavy and repetitive lifting and movement of products could place stress on their back and upper extremities. Forceful exertions to move a manual forklift in the workplace area could lead to fatigue and possible damage to muscles and other tissues. The objective of this study is to reduce ergonomics risks to an acceptable level and provide operators with the right tools and proper work environment. Digital human modeling based on the Jack software, is used for risk assessment. Results are analyzed to provide proper solutions. Ergonomic risks assessed include: force and posture risks, noise, vibration, temperature, and illumination. Lean process is implemented in the workplace to reduce the Lean wastes that include waiting time, transportation, and non-value-add processes. Ergonomic improvements are introduced to complement and support the Lean process implementation. Three main ergonomic risks are found to be high and could affect the operators: energy expenditure, posture, and back force. Several modifications are implemented to reduce these risks: the manual forklift is replaced with an automated forklift that is easy to move and requires less human effort, the workplace area is expanded to provide more work space, and the operators are provided with proper tools to perform the task without risk.

关键词： Manufacture

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