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  • Open Access

    ARTICLE

    Stokes Flow about a Slip Arbitrary-Shaped Particle

    A. Sellier

    CMES-Computer Modeling in Engineering & Sciences, Vol.87, No.2, pp. 157-176, 2012, DOI:10.3970/cmes.2012.087.157

    Abstract A new approach is proposed to accurately compute at a reasonable cpu time cost the hydrodynamic net force and net torque exerted on a slip and arbitrarily-shaped solid particle experiencing a prescribed slow rigid-body migration in a quiescent Newtonian liquid. The advocated method appeals to a boundary formulation which makes it possible to reduce the task to the treatment of a relevant regularized boundary-integral equation on the particle slipping surface. This integral equation is numerically inverted by implementing a boundary element collocation method. In addition to benchmark tests against analytical and numerical results available in More >

  • Open Access

    ARTICLE

    Design of Compliant Mechanisms Using Meshless Level Set Methods

    Zhen Luo1, Nong Zhang1, Tao Wu2,3

    CMES-Computer Modeling in Engineering & Sciences, Vol.85, No.4, pp. 299-328, 2012, DOI:10.3970/cmes.2012.085.299

    Abstract This paper presents a meshless Galerkin level-set method (MGLSM) for shape and topology optimization of compliant mechanisms of geometrically nonlinear structures. The design boundary of the mechanism is implicitly described as the zero level set of a Lipschitz continuous level set function of higher dimension. The moving least square (MLS) approximation is used to construct the meshless shape functions with the global Galerkin weak-form in terms of a set of arbitrarily distributed nodes. The MLS shape function is first employed to parameterize the level set function via the surface fitting rather than interpolation, and then… More >

  • Open Access

    ARTICLE

    Structural Damage Detection using Spatial Fourier Coefficients of Mode Shapes of Beams Simply Supported at Both Ends

    Gouravaraju Saipraneeth1, Ranjan Ganguli2

    Structural Durability & Health Monitoring, Vol.7, No.1&2, pp. 23-64, 2011, DOI:10.3970/sdhm.2011.007.023

    Abstract In this paper, the effect of damage on mode shape related parameters of a beam is investigated. The damage is represented by a localized reduction in beam stiffness. The damage location and amount is varied using a finite element model of the beam to obtain the mode shapes. A beam which is simply supported at both ends is used for the numerical results. The periodic nature of the beam is exploited to obtain spatial Fourier coefficients of the mode shapes. As the damage location and size are varied, it is found that the Fourier coefficients More >

  • Open Access

    ARTICLE

    Rotational Flexibility for Detecting Low Level Damage in Beam-Like Structures

    Saptarshi Sasmal1, K. Ramanjaneyulu2

    Structural Durability & Health Monitoring, Vol.7, No.4, pp. 253-282, 2011, DOI:10.3970/sdhm.2011.007.253

    Abstract This paper proposes a methodology for damage detection in beam like structures using vibration characteristics obtained from transfer matrix technique. At first, vibration characteristics of beam-like structure have been determined with the help of a computer program developed based on the formulations presented in this paper. Then, a detailed study has been carried out to categorise the influence of damage on frequency and mode shape (both displacement and rotational) information. For a structure with known magnitude and location of damage(s), frequencies and mode shape information are obtained and the same has been used in determining… More >

  • Open Access

    ABSTRACT

    Three dimensional acoustic shape sensitivity analysis accelerated by fast multipole boundary element method

    C. J. ZHENG, H. B. CHEN, T. MATSUMOTO, T. TAKAHASHI

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 121-122, 2011, DOI:10.3970/icces.2011.019.121

    Abstract A fast multipole boundary element method is presented for three dimensional acoustic shape sensitivity analysis in this study. The Burton-Miller formula which is a linear combination of the conventional boundary integral equation and the normal derivative boundary integral equation is adopted to conquer the fictitious eigenfrequency problem associated with the conventional boundary integral equation method in solving exterior acoustic problems. The continuous adjoint variable method is implemented in the sensitivity analysis and the concept of material derivative is used in the derivation. Constant elements are employed to discretize the boundary so that the hypersingular boundary More >

  • Open Access

    ABSTRACT

    Uni-axial 3-D shape measurement by liquid crystal digital shifter

    Yukitoshi OTANI, Fumio KOBAYASHI, Yasuhiro MIZUTANI, Manabu Harada, Toru YOSHIZAWA

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 107-108, 2011, DOI:10.3970/icces.2011.019.107

    Abstract A uni-axial three dimensional surface measurement by a liquid crystal digital shifter( LCDC) is proposed using a telecentric optical system. Distance information can be determined by measuring the contrast in the projected grating pattern. The magnification of the object image captured by a CCD camera is adjusted constant by changing the focus distance. A shadow less measurement of the object's area is archived by using a uni-axial system. The liquid crystal digital shifter is a powerful tool to make arbitrary intensity and frequency distribution. Surface profiles of some mechanical parts were measured to demonstrate this More >

  • Open Access

    ABSTRACT

    Dynamic 3-D shape measurement using Fourier method

    Xianyu Su, Qican Zhang, Wenjing Chen

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 77-78, 2011, DOI:10.3970/icces.2011.018.077

    Abstract Fourier transform method has been widely sued on fringe analysis in optical metrology, including the structured illumination metrology and the interference metrology. The Fourier transform profilometry is one of the popular non-contact 3-D shape measurement methods, where a Ronchi grating or sinusoidal grating is projected onto a 3-D diffuse surface, and the resulting deformed grating image is detected by a CCD camera and processed by a computer. This method requires only one frame of the deformed fringe pattern to retrieve the surface of measured object, so it has obvious advantage for real-time data acquisition and… More >

  • Open Access

    ABSTRACT

    Comparison of constitutive models using different yield functions for porous shape memory alloy with experimental date

    Liu Bingfei, Dui Guansuo, Zhu Yuping

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.3, pp. 73-74, 2011, DOI:10.3970/icces.2011.017.073

    Abstract Several constitutive models with different yield functions for porous shape memory alloy (SMA) are compared with the experimental date. Different approaches such as upper bound theory and lower bound theory have been adopted and a new correction formula of the yield function is proposed in this work to study the behavior of porous SMAs. Numerical results are compared with the experimental date by Zhao et al (2005). It shows that the researches using upper bound and lower bound are nearly the same and the new correction formula is much closer to the experimental data than More >

  • Open Access

    ABSTRACT

    Test investigation on fish-shaped pile subjected to torque in silt

    Lianhua Yuan

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 103-104, 2011, DOI:10.3970/icces.2011.020.103

    Abstract The torsional capacity of general circular section pile comes mainly from the tangential friction between pile and soil. But the pile - soil interface can provide a limited tangential friction. So the bearing capacity of general circular cross section pile is less. Pile does not bear more torque at a small torsion angle. Then the torsion angle of the pile develops rapidly.

    This report presents a experiment on the transformed pile subjected to torque. In this experiment, the steel pipe pile with a closed end is welded with pairs of steel flank pieces on the… More >

  • Open Access

    ABSTRACT

    Fast Boundary Element Method for Shape Optimization of RPV Nozzles

    H. T. Wang, L. Shi

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 11-12, 2011, DOI:10.3970/icces.2011.019.011

    Abstract A three-dimensional fast boundary element solver is developed for the shape optimization of nozzles of nuclear reactor pressure vessels (RPVs). In a RPV, pressure and mechanical loads may lead to high stress concentration due to the discontinuity of the structure, especially at the inner surface of the cold/hot legs. This work aims to minimize these stress concentrations by optimizing the geometry of the openings using modern shape optimization techniques and fast boundary element method. Shape optimization methods based on the principle of biological adaptive growth are incorporated into a boundary element method program and used More >

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