Open Access
ABSTRACT
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
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
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
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
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
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
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
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
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
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 >
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