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  • Open Access

    ABSTRACT

    Machine Parameter Optimization for Wire-Electric Discharge Machining

    F.R.M. Romlay1,2, A. Mokhtar2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.4, pp. 139-144, 2008, DOI:10.3970/icces.2008.008.139

    Abstract This paper presents an optimization of the wire-Electric Discharge Machining (EDM) cutting parameter at welding joint area. The experiment is conducted during a gear shape optimization process by reducing the gear material and weight. Some area of the gear is welded for material joining process. The wire-EDM cutting process is conducted by cutting at the single material and welding area. The parameters of cutting process such as wire speeds, wire tensions and wire voltage are considered to be optimized. The cutting condition at the single and double materials area is compared. The result of the More >

  • Open Access

    ABSTRACT

    Meshless Unsymmetric Collocation Method

    Leevan Ling1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.4, pp. 133-138, 2008, DOI:10.3970/icces.2008.008.133

    Abstract The history of meshless collocation methods featured plenty of nicely calculated practical solutions, but a solid mathematical basis was long missing for the most popular asymmetric technique introduced by E. Kansa. Thus the impact of this work will be to supply a lasting mathematical foundation which will also improve our general understanding of such technique. Our previous research gave a convergent algorithm. More >

  • Open Access

    ABSTRACT

    Mesh Quality Improvement for Unstructured Quadrilateral Multigrid Analysis

    Y. Wada1, T. Hayashi2, M. Kikuchi3

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.4, pp. 127-132, 2008, DOI:10.3970/icces.2008.008.127

    Abstract Due to more complex and severe design, more effective and faster finite element analyses are demanded. One of the most effective analysis ways is the combination of adaptive analysis and multigrid iterative solver, because an adaptive analysis requires several meshes with different node densities and multigrid solver utilizes such meshes to accelerate its computation. However, convergence of multigrid solver is largely affected by initial shape of each element. An effective mesh improvement method is proposed here. It is the combination of mesh coarsening and refinement. A good mesh can be obtained by the method to More >

  • Open Access

    ABSTRACT

    Mechanics of Fragmentable Geomaterials

    A.P.S. Selvadurai1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 121-126, 2008, DOI:10.3970/icces.2008.008.121

    Abstract This paper examines the mechanics of brittle fragmentation that can occur in geomaterials subjected to critical stress states that promote fragmentation as opposed to plastic flow. The discrete element technique is used to examine the dynamic interaction between a moving ice floe and a stationary structure. The results illustrate the influence of fragmentation on the reduction of the dynamic interactive stresses. More >

  • Open Access

    ABSTRACT

    Computation of Optimal Friction of Tuned Mass Damper for Controlling Base-Excited Structures

    Sang-Hyun Lee1, Sung-Sik Woo1, Seung-Ho Cho1, Lan Chung1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 115-120, 2008, DOI:10.3970/icces.2008.008.115

    Abstract In this study, based on the results from the sinusoidal base excitation analyses of a single degree of freedom system with a tuned mass damper (TMD), the optimal friction is computed so that the rail friction improve the performance of the TMD. The magnitude of the optimal friction increases with increasing mass ratio of the TMD and decreases with increasing structural damping. Particularly, it is observed that the optimized friction force gives better control performance than the optimized viscous damping of the TMD. However, because the performance of the TMD considerably deteriorates when the friction More >

  • Open Access

    ABSTRACT

    3D Crack Growth by Considering Re-Entrant Corners

    E. Schnack1, K. Kolk2, A. Dimitrov3

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 107-114, 2008, DOI:10.3970/icces.2008.008.107

    Abstract In fracture mechanics, corner and wedge singularities have to be considered for two- and three-dimensional problems in isotropic and layered anisotropic continua. To investigate the behaviour of crack propagation starting from corners and edges the information about stress asymptotics in the vicinity of three-dimensional corner points is needed [1]. Thus, in this paper two aspects are studied: the interface crack in layered anisotropic materials with re-entrant corners and surface cracks in homogeneous isotropic continua. Moreover a strategy is presented to model such surface breaking cracks efficiently within a numerical 3D simulation [2]. To study the… More >

  • Open Access

    ABSTRACT

    Quantum Ghost Imaging by Measuring Reflected Photons

    R. E. Meyers1, K. S. Deacon1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 101-106, 2008, DOI:10.3970/icces.2008.008.101

    Abstract A new type of imaging, Quantum ghost imaging, is described that is based on the measurement of photons reflected from an object . A CCD array is placed facing a chaotic light source and gated by a photon counting detector that simply counts all randomly reflected photons from an object. A ``ghost'' image of the object is then observed in the gated CCD. This interesting demonstration is not only useful for practical applications, such as x-ray lensless imaging, but is also important from a fundamental point of view. It further explores the nonclassical two-photon interference More >

  • Open Access

    ABSTRACT

    Unsupervised Support Vector Machine Based Principal Component Analysis for Structural Health Monitoring

    Chang Kook Oh1, Hoon Sohn1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 91-100, 2008, DOI:10.3970/icces.2008.008.091

    Abstract Structural Health Monitoring (SHM) is concerned with identifying damage based on measurements obtained from structures being monitored. For the civil structures exposed to time-varying environmental and operational conditions, it is inevitable that environmental and operational variability produces an adverse effect on the dynamic behaviors of the structures. Since the signals are measured under the influence of these varying conditions, normalizing the data to distinguish the effects of damage from those caused by the environmental and operational variations is important in order to achieve successful structural health monitoring goals. In this paper, kernel principal component analysis More >

  • Open Access

    ABSTRACT

    Some Aspects Regarding the Kinematics Parameters in the Football Game

    Emil Budescu1, Lucian Popescu2, Ioan Iacob2, Eugen Merticaru1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.3, pp. 85-90, 2008, DOI:10.3970/icces.2008.008.085

    Abstract This article has no abstract. More >

  • Open Access

    ABSTRACT

    Coupling Atomistic and Continuum Finite Element Models: Multi-Scale Simulations of Nanotribological Contacts of Nanometer Scale Coatings

    Baolin Wang1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.8, No.2, pp. 81-84, 2008, DOI:10.3970/icces.2008.008.081

    Abstract When the size of a physical system is smaller than its characteristic dimensions, the macroscopic viewpoint may not be applicable. In addition, experiments at micro/nanometer scale are difficult and the analysis of nano-experimental data is far from simple. This is mostly due to the lack of effective models that are able to study the structural characteristics and mechanics behavior of the micro/nanometer physical systems. Atomic simulation simulation has been used extensively in the investigation of nanoscale phenomena. However, the size limit of atomic simulation is far short to reach the macroscale because of the limitation More >

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