Home / Journals / ICCES / Vol.20, No.1, 2011
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  • Open Access

    ABSTRACT

    Phase Retrieval in Coherent Optical Metrology

    Y. H. Huang, S. Y. Hung, Y. S. Liu, Y. Y. Hung
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 1-2, 2011, DOI:10.3970/icces.2011.020.001
    Abstract Coherent optical metrology represents a broad scope of techniques using coherent or partial coherent light as a probing matter for various measurements including refractive index, deformation, 3D shape, velocity, temperature, pressure etc. Phase retrieval places a central role in various coherent techniques such as optical nondestructive testing (NDT), surface plasmon resonance (SPR) optical biosensors, laser Doppler vibrometry (LDV), digital holography, optical coherence tomography (OCT) and spectral phase interferometry for direct electric-field reconstruction (SPIDER). Different phase retrieval schemes have been applied in different applications to meet their specific requirements. This article tends to provide a brief review and comparison on various… More >

  • Open Access

    ABSTRACT

    Impulsive fracture by nonlinear and nondestructive evaluation of these cracks by linear surface acoustic waves

    Peter Hess, Alexey M. Lomonosov, AndrAC Moura, Peter V. Grigoriev
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.020.003
    Abstract Crack generation by the steep shock fronts of laser-induced nonlinear surface acoustic wave (SAW) pulses and their nondestructive evaluation (NDE) by short linear SAW pulses was studied experimentally and theoretically. With the contactfree laser-based photoacoustic pump-probe technique, nondestructive testing could be extended to the characterization of elastic-shock-generated partially closed microcracks in the range of tens of micrometers.

    By numerical simulations the propagation of thermoelastically launched broadband SAW pulses in nonlinear media and the initiation of crack growth is described. The characteristic features of SAW profiles in linear media, nonlinear media with quadratic nonlinearity, and nonlinear media with crack nucleation… More >

  • Open Access

    ABSTRACT

    The Development of a Shearography Device and Its Applications

    Dongsheng Zhang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 5-6, 2011, DOI:10.3970/icces.2011.020.005
    Abstract Composites which are considered to be a sort of high-performance materials have been used in the aerospace industry, as well as other industries. Due to the high quality standards and the applicable safety purposes, highly precise and non-destructive test methods are highly demanded for both manufacturing and maintenance. This talk describes the portable shearography device which is developed in Shanghai University. The laser projection and inspection sensor are integrated and mounted on the tripod to meet the requirement of field inspections. Two loading systems including thermal and vibrating are introduced to achieve repeatable test results. Real-time phase shifting dramatically improves… More >

  • Open Access

    ABSTRACT

    Alternative Forms of Green's Functions and Infinite Product Representation of Elementary Functions

    Yuri A. Melnikov
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 7-8, 2011, DOI:10.3970/icces.2011.020.007
    Abstract A novel technique, recently reported by the author for the first time, is employed here for obtaining nontrivial infinite product representations for a number of elementary functions. The technique is reviewed to take a look at some of its peculiarities. The technique is based on the comparison of alternative expressions of Green's functions for the two-dimensional Laplace equation. Those expressions are constructed by different methods. Some standard boundary-value problems are considered for the indicated equation. Classical closed analytical forms of Green's functions for such problems are compared against those obtained by the method of images. This comparison brings a number… More >

  • Open Access

    ABSTRACT

    Air Quality Simulation for Interior of an Automobile

    Bo Mei, Xiuling Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 9-10, 2011, DOI:10.3970/icces.2011.020.009
    Abstract Automobiles are used every day and air quality in the automobile is directly related to people's health. This paper focuses on the distribution of automotive interior carbon dioxide on the highway. A typical sedan is chosen as a sample. Carbon-dioxide meter and wind meter are used to get essential data. Then, the data is analyzed by the commercial CFD software - GAMBITAR and FLUENTAR. After plotting and comparing the contours of the distribution, how changing the fan speed will change the distribution is got. First, concentration of carbon dioxide at the bottom is always the highest region among the whole… More >

  • Open Access

    ABSTRACT

    Sonic-Shearography for Nondestructive Inspection of Bonding Integrity Between Tiles and Building Wall

    Michael Y. Y. Hung
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 11-12, 2011, DOI:10.3970/icces.2011.020.011
    Abstract Aging of tall buildings has serious safety concerns. One of the potential hazards is loosened tiles (or external finishing) falling off the external wall of buildings. This can be life-threatening to passers-by. A major cause for this is inadequate bonding during tiling, or degradation of the bonded interface due to aging. It is therefore important to be able to detect and identify areas where the tiles are likely to detach from the external walls and take preventive measures. Current inspection methods primarily rely on human inspectors to tap every piece of tile, and listen for hollow echoes generated by the… More >

  • Open Access

    ABSTRACT

    Quantitative nondestructive tests of defects with optical methods

    Xide Li
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 13-14, 2011, DOI:10.3970/icces.2011.020.013
    Abstract The quantitatively assessment of defect characteristic parameters (DCP), such as coordinates, size, embedding depth and type of defects in structures or materials, is becoming increasingly important. One reason is for economy and safety, and the other for a defect in structures may lead to failure while it is growing to a critical size. Therefore, it is possible to estimate both remaining life of structures and extent of the degradation by knowing the dimensions of defects presenting in structures. In this paper, several research topics on quantitative detection of the DCP in our group are reviewed as follows:
    )Nondestructive testing… More >

  • Open Access

    ABSTRACT

    Wave Propagation in Carbon Nanotubes

    Lifeng Wang, Haiyan Hu, Wanlin Guo
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 15-16, 2011, DOI:10.3970/icces.2011.020.015
    Abstract The wave dispersions of longitudinal and flexural wave propagations in single-walled and multi-walled carbon nanotubes are studied in the frame of continuum mechanics and molecular dynamics simulation. The dispersion relations between the phase velocity, group velocity and the wave number for the flexural and longitudinal waves, described by a beam model and a cylindrical shell model, are established for both single- and multi-walled carbon nanotubes. The effect of micro-structures in carbon nanotubes on the wave dispersion is revealed through the non-local elastic models of beam and cylindrical shell including the second order gradient of strain and a parameter of micro-structure.… More >

  • Open Access

    ABSTRACT

    Robust Formation Design for the Magnetospheric Multiscale Mission using a Stochastic Optimization Approach

    C. W. T. Roscoe, S. R. Vadali, K. T. Alfriend
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 17-18, 2011, DOI:10.3970/icces.2011.020.017
    Abstract A stochastic optimization approach is used to design a tetrahedral spacecraft formation for the NASA Magnetospheric Multiscale (MMS) mission whose performance characteristics are robust with respect to differential semimajor axis errors. The MMS mission requires a formation of four satellites which is to form a nearly regular tetrahedron near apogee of a highly eccentric orbit, and is to remain in this configuration throughout as many successive orbits as possible without maintenance maneuvers. When all design parameters are deterministic, such a formation can be designed by maximizing a "quality factor" throughout a "region of interest," either over multiple orbits or over… More >

  • Open Access

    ABSTRACT

    An Overview of Aviation Safety Research an Center for Aviation Safety at North Carolina A&T State University

    Kunigal Shivakumar
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 19-20, 2011, DOI:10.3970/icces.2011.020.019
    Abstract The vision of the Center for Aviation Safety (CAS) is to establish a strong aerospace engineering research and education program by bringing together highly competent and dedicated faculty members at North Carolina A&T State University (A&T) through the NASA funding to address the challenges in composite aircraft structures, fire safety, hazards of airflow, and the alternate fuels. The research goals of CAS will be accomplished through an understanding of science and engineering to developing new materials, tools, models, and technologies that support the safe operation of aerospace vehicles. Research goal is being accomplished through three tasks: Advancing Composites and Structures;… More >

  • Open Access

    ABSTRACT

    Active thermography based integrated system for Nondestructive testing and evaluation and its applications

    Y.S. Chen, Y.H. Huang, B. Yeung, L. Liu, Y.Y. Hung
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 21-22, 2011, DOI:10.3970/icces.2011.020.021
    Abstract Active thermography is an optical-based non-contact inspection method for full-field and quantitative measurement of surface radiation to predict potential faults or inner structure of a test object. The mechanism of the active thermography inspection is to excite the test object using appropriate thermal excitation methods and measure the corresponding thermal response. Active thermography conducts testing in a more controllable way and offer more reliable results compared to passive thermography. This paper reports the development of integrated systems featured some advanced excitation methods and thermal image processing methods. Experiments have been conducted on samples with disbonds, delaminations, internal cracks or voids,… More >

  • Open Access

    ABSTRACT

    Computational Characterisation of FRC Using Micromechanical FEA Based on Appropriate Unit Cells

    Shuguang Li
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.020.023
    Abstract Unit cells have been found as an empowering tool for the characterisations of modern composites. The author is honoured to have contributed to the establishment of a systematic methodology for the formulation of unit cells in the past decade through over a dozen of publications on this specific topic.
    The formulation of a unit cell could start as if it was a trivial exercise, at least as sometimes perceived by some users, where casual treatments have been found as a result. However, it could soon become overwhelming in order to stand scrutiny and to deal with more sophisticated scenarios. Many… More >

  • Open Access

    ABSTRACT

    Molecular dynamics simulations of the nano-indentation for aluminum and copper

    Xiaozhi Tang, Yafang Guo, Yu Gao
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.020.025
    Abstract Atomistic simulations were performed to study the nano-indentation for two kinds of FCC metals, aluminum and copper. Two different deformation mechanisms were observed in our simulation under exactly the same simulation condition. An embedded atom method potential was employed for copper and a generalized form of EAM potential due to Finnis and Sinclair for aluminum. In the simulation model, the substrate was constructed with 78408 atoms in an 8I?*40I?*60I? cell, here I? means the lattice constant. The indenter was modeled by a cubic with its side length of 8a.During the simulation, the period boundary condition was applied to the (1… More >

  • Open Access

    ABSTRACT

    Award Lecture

    Jeom Kee Paik
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 27-28, 2011, DOI:10.3970/icces.2011.020.027
    Abstract T.H.H. PIAN MEDAL

    Award Lecture

    Prof. Jeom Kee Paik

    Department of Naval Architecture and Ocean Engineering

    Pusan National University, Korea More >

  • Open Access

    ABSTRACT

    Dynamic Strain Sensing Using Adaptive Fiber Bragg Grating Sensors

    Yan-Jin Zhu, Yinian Zhu, Li Hui, Sridhar Krishnaswamy
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 29-30, 2011, DOI:10.3970/icces.2011.020.029
    Abstract Invited Lecture

    Prof. Sridhar Krishnaswamy

    Northwestern University, USA More >

  • Open Access

    ABSTRACT

    First Principles Study of Nano-bio Hybrid Systems

    Ravi Pandey
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 31-32, 2011, DOI:10.3970/icces.2011.020.031
    Abstract Theme Lecture: First Principles Study of Nano-bio Hybrid Systems
    Prof Ravi Pandey
    Michigan Tech University, USA More >

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