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Smart Structures and Materials 2005 Conference

作者： Kim, SJ Paik, SH Park, SH Seoul Natl Univ Flight Vehicle Res Ctr Seoul 151 South Korea

ISBN: (纸本)0819457450

The numerical simulation is performed for the damage induced acoustic emission and the wave propagation event of composite plates by the finite element transient analysis. The acoustic emission and the following wave motions from a predictable damage under a static loading is simulated to investigate the applicability of the explicit finite element method and the equivalent volume force model as a simulation tool of wave propagation and a modeling technique of an acoustic emission. For such a simple case of the damage event under static loading, various parameters affecting the wave motion are investigated for reliable simulations of the impact damage event. The numerical experiment is also conducted for simulating the full procedures from the impact phenomenon to the damage induced acoustic emission wave. The numerically reproduced wave signal is transformed by wavelet transform to analyze the frequency and the resolution characteristics between the acoustic emission signals of various damage mechanisms. The high velocity and the small wave length of the acoustic emission require a refined analysis with dense distribution of the finite element and a small time step. In order to fulfill the requirement for capturing the exact wave propagation and to cover the 3-D simulation, we utilize the parallel FE transient analysis code and the high performance computing(HPC) technology.

关键词： impact damage acoustic emission parallel supercomputing

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A parallel-supercomputing investigation of the stiffness of aligned, short-fiber-reinforced composites using the Boundary Element Method

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International Journal for Numerical Methods in Engineering 1999年第18期40卷

作者： M. S. Ingber T. D. Papathanasiou Department of Mechanical Engineering University of New Mexico Albuquerque NM 87131 U.S.A. Department of Chemical Engineering University of South Carolina Columbia SC 29208 U.S.A.

Computational experiments are carried out in three-dimensional, multi-fibre specimens with the objective of determining the influence of fibre volume fraction (ϕ) and aspect ratio ( a r ) on the effective tensile modulus of aligned, discontinuous fibre-reinforced composites. The Boundary Element Method (BEM), implemented on a 1840-node Intel Paragon parallel supercomputer using a torus-wrap mapping, enables the prediction of the tensile behaviour of composite specimens consisting of up to 200 discrete aligned short fibres, randomly dispersed in an elastic matrix. Statistical averages of the computed effective longitudinal moduli are compared with the predictions of the Halpin–Tsai equation and are found to be in good agreement for low values of a r and ϕ. However, as a r and/or ϕ increase, the predictions of the Halpin–Tsai equation fall below the computed moduli. Consideration of the finite packing efficiency of the fibres as proposed by Lewis and Nielsen results in a generalized form of the Halpin–Tsai equation whose predictions are in very good agreement with the BEM calculations for the entire range of ϕ and a r examined. The scatter in the computed moduli decreases with increasing number of fibres, reflecting the ‘homogenization’ of the specimen brought about by consideration of larger numbers of smaller fibres. This scatter grows with increasing ϕ and a r , reflecting an increase in the magnitude and complexity of inter-fibre interactions. © 1997 by John Wiley & Sons, Ltd.

关键词： composite materials aligned short fibers boundary element method modulus of elasticity parallel supercomputing Halpin-Tsai equations

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Iterative accelerating algorithms with Krylov subspaces for the solution to large-scale nonlinear problems

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NUMERICAL ALGORITHMS 2000年第1期23卷 1-30页

作者： Risler, F Rey, C Lab Modelisat & Mecan Struct CNR UPRESA 8007 F-75015 Paris France

Discrete solution to nonlinear systems problems that leads to a series of linear problems associated with non-invariant large-scale sparse symmetric positive matrices is herein considered. Each linear problem is solved iteratively by a conjugate gradient method. We introduce in this paper new solvers (IRKS, GIRKS and D-GIRKS) that rely on an iterative reuse of Krylov subspaces associated with previously solved linear problems. Numerical assessments are provided on large-scale engineering applications. Considerations related to parallel supercomputing are also addressed.

关键词： iterative approach conjugate gradient Krylov subspaces superconvergence Ritz values nonlinear optimization parallel supercomputing

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A parallel-supercomputing investigation of the stiffness of aligned, short-fiber-reinforced composites using the boundary element method

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 1997年第18期40卷 3477-3491页

作者： Ingber, MS Papathanasiou, TD UNIV S CAROLINA DEPT CHEM ENGNCOLUMBIASC 29208 UNIV NEW MEXICO DEPT MECH ENGNALBUQUERQUENM 87131

Computational experiments are carried out in three-dimensional, multi-fibre specimens with the objective of determining the influence of fibre volume fraction (phi) and aspect ratio (a(r)) on the effective tensile modulus of aligned, discontinuous fibre-reinforced composites. The Boundary Element Method (BEM), implemented on a 1840-node Intel Paragon parallel supercomputer using a torus-wrap mapping, enables the prediction of the tensile behaviour of composite specimens consisting of up to 200 discrete aligned short fibres, randomly dispersed in an elastic matrix. Statistical averages of the computed effective longitudinal moduli are compared with the predictions of the Halpin-Tsai equation and are found to be in good agreement for low values of a(r) and phi. However, as a(r) and/or phi increase, the predictions of the Halpin-Tsai equation fall below the computed moduli. Consideration of the finite packing efficiency of the fibres as proposed by Lewis and Nielsen results in a generalized form of the Halpin-Tsai equation whose predictions are in very good agreement with the BEM calculations for the entire range of phi and a(r) examined. The scatter in the computed moduli decreases with increasing number of fibres, reflecting the 'homogenization' of the specimen brought about by consideration of larger numbers of smaller fibres. This scatter grows with increasing phi and a(r), reflecting an increase in the magnitude and complexity of inter-fibre interactions. (C) 1997 by John Wiley & Sons, Ltd.

关键词： composite materials aligned short fibers boundary element method modulus of elasticity parallel supercomputing Halpin-Tsai equations

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parallelized simulation of complicated polymer structures and its efficiency

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 1997年第4期E80D卷 531-537页

作者： Shida, K Ohno, K Kimura, M Kawazoe, Y Japan Advanced Institute of Science and Technology Hokuriku Ishikawa-ken. 901-21 Japan Institute for Materials Research Tohoku University Sendai-shi 980-77 Japan

A large scale simulation for polymer chains in good solvent is performed. The implementation technique for efficient parallel execution, optimization, and load-balancing are discussed on this practical application. Fi... 详细信息

关键词： parallel supercomputing computational physics Monte-Carlo simulation dynamic load balancing

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FAT-TREES - UNIVERSAL NETWORKS FOR HARDWARE-EFFICIENT supercomputing

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IEEE TRANSACTIONS ON COMPUTERS 1985年第10期34卷 892-901页

作者： LEISERSON, CE Lab. for Comput. Sci. MIT Cambridge MA USA Abstract Authors References Cited By Keywords Metrics Similar Download Citation Email Print Request Permissions

The author presents a new class of universal routing networks, called fat-trees, which might be used to interconnect the processors of a general-purpose parallel supercomputer. A fat-tree routing network is parameterized not only in the number of processors, but also in the amount of simultaneous communication it can support. Since communication can be scaled independently from the number of processors, substantial hardware can be saved for such applications as finite-element analysis without resorting to a special-purpose architecture. It is proved that a fat-tree of a given size is nearly the best routing network of that size. This universality theorem is established using a three-dimensional VLSI model that incorporates wiring as a direct cost. In this model, hardware size is measured as physical volume. It is proved that for any given amount of communications hardware, a fat-tree built from that amount of hardware can stimulate every other network built from the same amount of hardware, using only slightly more time (a polylogarithmic factor greater).

关键词： Fat-trees VLSI theory interconnection networks parallel supercomputing routing networks universality

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Škálovatelné strojové učení s využitím nástrojů Hadoop a Mahout

Škálovatelné strojové učení s využitím nástrojů Ha...

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作者： Kryške, Lukáš Brno University of Technology

Tato bakalářská práce srovnává několik nástrojů pro realizaci škálovatelné platformy strojového učení a popisuje jejich výhody a nevýhody. Dále prá... 详细信息

Tato bakalářská práce srovnává několik nástrojů pro realizaci škálovatelné platformy strojového učení a popisuje jejich výhody a nevýhody. Dále práce prakticky realizuje funkčnost škálovatelné platformy založené na nástroji Apache Hadoop a zabývá se měřením výkonu samoučícího algoritmu K-Means pomocí knihoven strojového učení Apache Mahout na celkem pěti výpočetních uzlech.

关键词： Hadoop Mahout superpočítač paralelní zpracování dat strojové učení Hadoop Mahout supercomputer parallel supercomputing machine learning Text

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