Home / Journals / ICCES / Vol.19, No.1, 2011
Table of Content
  • Open Access

    ABSTRACT

    Positive Position Feedback Control for Active Suppression of Impact-induced Vibrations Using a Point-wise Fiber Bragg Grating Displacement Sensing System

    K.C. Chuang, C.C. Ma, C.H. Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 1-2, 2011, DOI:10.3970/icces.2011.019.001
    Abstract Smart flexible structures involve four key elements: actuators, sensors, control strategies, and power conditioning electronics, which makes the structures being capable of realizing specific functions. Recently, fiber Bragg grating (FBG) strain sensors are being considered to be integrated into smart structures since they possess many excellent properties such as low density, small size, simplicity of fabrication, and immunity to electromagnetic fields. In this paper, unlike traditional FBG strain sensors, a fiber Bragg grating (FBG) sensing system which has the ability to detect point-wise out-of-plane displacement responses is set up on a smart cantilever beam to perform active vibration control. The… More >

  • Open Access

    ABSTRACT

    Variational principles for a theorietical model with coupled diffusion and mechanics

    Suo Yaohong, Shen Shengping
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.019.003
    Abstract In this paper chemical potential is introduced to describe the metal oxidation reaction. As an innovation, concentration diffusion is firstly considered to spread in a wave ways called non-fick diffusion in high temperature. Furthermore, to make concentration diffusion equation satisfy the typical Fick's law in form, inertia chemical potential is proposed. Then the several kinds of variational principles for coupled diffusion and mechanics are established and its corresponding governing equations and boundary conditions are naturally presented from their variational principle, respectively. More >

  • Open Access

    ABSTRACT

    Design of Processing System of Vibration Signals

    Zeng Fan, Zhu shijian, Lou jingjun
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 5-6, 2011, DOI:10.3970/icces.2011.019.005
    Abstract A signal processing electric circuit used in vibration signals processing system has been designed, which contains the pre-amplifier, the single chip ATMEGA16 and the microprocessor programmable MAX262 and so on. Its feasibility test is carried out. The center frequency and other parameters are input into the computer by VC software programmed, and the computer sends these instructions to the single chip. The single chip controls MAX262 filter to work regularly and the noise signals are well filtered. The signals output from the data sampler are analyzed and processed, and the vibration signals can be clearly recognized. The experimental results show… More >

  • Open Access

    ABSTRACT

    Modeling the effect of earthquake, excavation and bolt reinforcement with extended DDA of meshless interpolations

    Yongzheng Ma, Hong Zheng
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 7-8, 2011, DOI:10.3970/icces.2011.019.007
    Abstract The traditional Discontinuous Deformation Analysis (DDA) method, like other Discrete Element Methods, is created to model the discrete block system. The extended DDA method based on meshless interpolations means utilizing meshless interpolations, usually the Moving Least-Squares interpolations, to present block displacement field. In the new extensions here, the effects of earthquake, excavation and bolt reinforcement on the assemblages of large blocks are modeled: for modeling earthquake, the initial acceleration value from earthquake at certain DDA time step can be interpolated from the earthquake acceleration vs. time curve; the modeling of excavation is by reversing in-situ stresses at excavation internal boundaries… More >

  • Open Access

    ABSTRACT

    A New Molecular Structural Mechanics Model for the Flexural Analysis of Monolayer Graphene

    G. Shi, P. Zhao
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 9-10, 2011, DOI:10.3970/icces.2011.019.009
    Abstract Based on molecular mechanics, a new structural mechanics model, a 2-D frame composed of equivalent anisotropic beams and flexible connections, is proposed for the simulation of the static and dynamic flexural behavior of monolayer graphene. The equivalent beam representing the C-C bond in the new molecular structural mechanics (MSM) model has two salient features compared with other MSM models proposed for the analysis of carbon nanotubes: one is that the flexible connections at the beam ends are used to account for the bond-angle variations between the C-C bonds; and the other is that there are two principal bending rigidities used,… 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 to optimize the design of… More >

  • Open Access

    ABSTRACT

    Darcy-Stokes Equations with Finite Difference and Natural Boundary Element Coupling Method

    W. H. Peng, G. H. Cao, Z. Z. Dong, S. C. Li
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 13-14, 2011, DOI:10.3970/icces.2011.019.013
    Abstract Numerical method is applied to investigate the Darcy-Stokes equations, which is governing the steady incompressible Stokes flow past a circular cavity in a porous medium. The free fluid flow is modeled by the incompressible Stokes equations, and the flow in the porous medium is imposed by Darcy equations. Based on domain decomposition method with D-N alternating iteration algorithm, the coupling method of finite difference method and natural boundary element method is studied for the coupling Darcy-Stokes equations under a certain pressure difference.
    Divide the whole domain into two non-intersecting bounded subdomains and . The boundary of cavity is the artificial… More >

  • Open Access

    ABSTRACT

    Progress in improving computational efficiency of MLPG_R method for nonlinear water waves

    Q.W. Ma
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 15-16, 2011, DOI:10.3970/icces.2011.019.015
    Abstract Over the past several years, the research group led by the author has extended the MPLG (Meshless Local Petrov-Galerkin) method developed by Prof. Atluri and his group to model nonlinear water waves; and then made further development to produce a method called MLPG_R (Meshless Local Petrov-Galerkin method based on Rankine source solution) method. In order to improve the computational efficiency of the method for modelling nonlinear water waves, several techniques have been developed. They include (1) introduction of a weak form of governing equation that does not contain derivatives of unknown functions; (2) a new meshless interpolation method of a… More >

  • Open Access

    ABSTRACT

    Spherical indentation into elastoplastic materials: Indentation-response based definitions of the representative strain

    Yan-ping CAO, Xiu-qing Qian, Norbert Huber
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 17-18, 2011, DOI:10.3970/icces.2011.019.017
    Abstract In the development of a systematic method to determine the mechanical properties of materials using depth-sensing instrumented indentation tests, a key issue is to find the connection between the indentation response and the properties of the indented material. For spherical indentation into power law engineering materials, we showed that this problem can be solved by using the concept of the representative strain. In the present research, using finite element analysis based on the incremental plasticity theory and large deformation formulations, we proposed four indentationresponse based definitions of the representative strain. Each of them leads to a simple and explicit expression… More >

  • Open Access

    ABSTRACT

    Efficiency improvement of vibration-base piezoelectric energy harvesting device

    Bo Mi Lee, In-Ho Kim, Hyung-Jo Jung
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 19-20, 2011, DOI:10.3970/icces.2011.019.019
    Abstract Vibration energy harvesting, which converts ambient vibration energy into electrical energy, has been an attractive energy scavenging technique to power wireless sensors or low power devices. Even though vibration energy harvesting has drawbacks which are relatively low harvested power and narrow bandwidth, vibration energy scavenging is one of the promising alternative power techniques in that MEMS techniques can be applied to microminiaturize the system. Therefore, many researches have been done to overcome these problems(Lee et al.2010). This paper presents improvement efficiency on piezoelectric vibration energy harvesting device to surmount issues of vibration energy harvesting. Numerical simulation and experimental test are… More >

  • Open Access

    ABSTRACT

    Optical inner profile measurement for pipes and tubes

    T. Yoshizawas, T. Wakayama
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 21-22, 2011, DOI:10.3970/icces.2011.019.021
    Abstract This paper summarizes a principle for measurement of inner diameter or profile of pipes and tubes using optical method. Based on this principle, a compact probe has been developed for industrial applications such as car industry, heavy industry and civil engineering. In addition to a large probe for pipes, tubes and tank-like objects with diameter larger than 100 meter, such a small size probe as 3-25 mm in diameter has been produced including prototypes and commercialized ones. Some experimental results are shown that with applications. More >

  • Open Access

    ABSTRACT

    Investigations of sieving performance in a granular system using sieve shaker experiments

    Li-Shin Lu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.019.023
    Abstract Sieve shaker is widely used in industrial and experimental processes for sieving granular material. With simply mechanical motion and convenient replacement of sieves, sieve shaker is also an appropriate device to be employed for the research of particle sieving. This study uses an experimental system of sieve shaker which can measure the sieving efficiency in real time to investigate the sieving performance of granular material. Two kinds of glass bead with different diameters, 1 mm and 5 mm, are used as the granular material to explore the influences of vibrating condition, size of mesh hole and thickness of granular layer… More >

  • Open Access

    ABSTRACT

    The study of using external fluid loading on a vibrating rectangular plate for suspended sediment concentration in water

    Yu-Cheng Liu, Yin-Sung Hsu, Jin H. Huang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.019.025
    Abstract This paper presents the result of a theoretical study on a new fluid density measuring concept which uses the effect of external fluid loading on a vibrating thin plate. The underling physical principle of this concept is that the resonance frequencies of an immersed vibrating plate change with the surface impedance changes caused by the mass density variations of the external fluid. In this paper, the analytical solutions of resonance frequencies with specific gravity are demonstrated by using the finite element simulation, COMSOL. The theoretical analysis presented in this paper shows that the resonance frequencies of an immersed vibrating thin… More >

  • Open Access

    ABSTRACT

    Path-Tracing Analysis of Axially Compressed Elastic Cylindrical Shells

    Takaya Kobayashi, Yasuko Mihara, Fumio Fujii
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 27-28, 2011, DOI:10.3970/icces.2011.019.027
    Abstract In designing a modern lightweight structure, the determination of the critical buckling load in an ideal condition is not sufficient. Clarifying the postbuckling behavior is also required. One reason is to estimate the effect of practically unavoidable imperfections on the critical load and another reason is to evaluate the ultimate load-carrying capacity of the structure. For the buckling problem of circular cylindrical shells under axial compression, experimental results showed that after the primary buckling, the secondary buckling occurred accompanied by successive reductions in the number of the circumferential waves at every path-jumping. In this paper, we traced this successive buckling… More >

  • Open Access

    ABSTRACT

    The Modified Collocation Trefftz Method and Exponentially Convergent Scalar Homotopy Algorithm for the Inverse Boundary Optimization Problem

    H.F. Chan, C.M. Fan
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 29-30, 2011, DOI:10.3970/icces.2011.019.029
    Abstract The inverse boundary optimization problem, which is governed by Helmholtz equation, is analyzed by the modified collocation Trefftz method (MCTM) and the exponentially convergent scalar homotopy algorithm (ECSHA). In the inverse boundary optimization problem, the position for part of boundary with given boundary condition is unknown, and the position for the rest of boundary with additionally specified boundary conditions is given. Therefore, it is very difficult to handle the boundary optimization problem by any numerical scheme. In order to stably solve the boundary optimization problem, the MCTM, one kind of boundary-type meshless methods, will be adopted in this study, since… More >

  • Open Access

    ABSTRACT

    The Method of Fundamental Solutions for the Harbor Oscillation Problem

    Y.C. Liu, C.M. Fan, H.F. Chan, S.S. Hsiao
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 31-32, 2011, DOI:10.3970/icces.2011.019.031
    Abstract The harbor oscillation problem, which is governed by inhomogeneous Helmholtz equation, is analyzed by the combination of the method of fundamental solutions (MFS) and method of particular solutions (MPS). The governed inhomogeneous Helmholtz equation is derived from the mild-slope equation and potential theory. The numerical solutions of the velocity potential of the harbor oscillation problem are decomposed as the homogeneous solution and the particular solution. While the particular solution is obtained by the MPS, the MFS is adopted to analyze the homogeneous solution. The particular solution is expressed as the linear combination of radial basis function, as the homogeneous solution… More >

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