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 >

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 More >

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… More >

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 More >

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… More >

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 >

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… More >

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 More >

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 More >

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 >