Open Access
ABSTRACT
Su Ji-Jun1,2, Zhang Zhao-Cheng1, Hu Hong1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 87-94, 2009, DOI:10.3970/icces.2009.011.087
Abstract This paper concentrates on the development and evaluation of linear characteristics of a complex flexure hinge with high accuracy and large stiffness. The flexure hinge mechanism is used to clamp the shaft of a micropositioning stage based on the inchworm principle. Six key parameters of the flexure hinge are optimized by using finite element method. Developed flexure hinge has very good effects on the clamping and resilience that are accurate and reasonable. The evaluation result shows that the flexure hinge has excellent linear characteristic. More >
Open Access
ABSTRACT
Jeng-Tzong Chen1,2, S. C. Shieh1, Y. T. Lee1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 95-96, 2009, DOI:10.3970/icces.2009.011.095
Abstract Green's functions of Laplace problems with circular boundaries are solved by using three approaches, analytical, semi-analytical and numerical solutions. For the analytical solution, we derive the Green's function by using the bipolar coordinates. Three kinds of semi-analytical solutions using (a). image method, (b). the null field BIE using the Green's third identity, and (c). the null field BIE in conjunction with superposition technique using the addition theorem are considered. A numerical method using the image concept is also employed to study the optimal location of MFS. It is interesting to find that the two frozen images appear on the two… More >
Open Access
ABSTRACT
Bohou Xu1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 97-98, 2009, DOI:10.3970/icces.2009.011.097
Abstract Stochastic resonance is a mechanical concept and may be used to image processing. This paper aims to develop an elementary theory of two-dimensional parameter-induced stochastic resonance (PSR) in order to contribute a new approach to nonlinear image processing. For tackling applications of stochastic resonance (SR) in image processing where adding noise may not be an easy task, we propose to generalize the concept of parameter-induced stochastic resonance from the one-dimensional case to the two-dimensional case. Specially, a novel two-dimensional system which demonstrates the feature of parameter-induced stochastic resonance is proposed for nonlinear image processing. An interesting feature of this paper… More >
Open Access
ABSTRACT
Mani Khezri1, Alireza Hashemian1, Hossein M. Shodja1,2,3
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 99-108, 2009, DOI:10.3970/icces.2009.011.099
Abstract Meshless methods using kernel approximation like reproducing kernel particle method (RKPM) and gradient RKPM (GRKPM) generally use a set of particles to discretize the subjected domain. One of the major steps in discretization procedure is determination of associated volumes particles. In a non-uniform or irregular configuration of particles, determination of these volumes comprises some difficulties. This paper presents a straightforward numerical method for determination of related volumes and conducts a survey on influence of different assumption about computing the volume for each particle. Stress intensity factor (SIF) as a major representing parameter in fracture of solids is calculated by employing… More >
Open Access
ABSTRACT
Kuen Ming Shu1, Chien Chih Chen2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 109-110, 2009, DOI:10.3970/icces.2009.011.109
Abstract Ultrasonic welding is the joining or reforming of thermoplastics through the use of heat generated from high-frequency mechanical motion. Rotary welding is a technique to press two parts together and one part is hold fixed the other rotates at high speed, the friction between the two parts generate heat which causes the parts to melt at the interface, when rotation stops, the weld cools down and solidifies. In this research, an experimental set-up integrated these two different welding processes in one machine set was designed and fabricated to provide a tool to study the integrated welding mechanism.
In this study,… More >
Open Access
ABSTRACT
Hisham Abdel-Fattah1, Sameer Hamoush2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 111-112, 2009, DOI:10.3970/icces.2009.011.111
Abstract This paper develops Fiber Reinforced Plastic (FRP) Composites retrofit systems to enhance the structural performance of deficient reinforced concrete beams. The paper highlights the design of the different FRP systems and then, systems with promising results are used to upgrade deficient beams. Structural evaluation for retrofitted beams is performed to evaluate the ductility and strength performance. This study mainly focuses on the uses of Glass Fiber Reinforced Plastics (GFRP), Carbon Fiber Reinforced Plastics (CFRP) and hybrid reinforced plastics that use a mixture of carbon and glass fibers. As part of the design of the FRP systems, an experimental program was… More >
Open Access
ABSTRACT
Dae-Hyun Park1, Hyun-Hee Park2, Yoon Kim1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 113-114, 2009, DOI:10.3970/icces.2009.011.113
Abstract In this paper, we propose a post-processing visual enhancement technique to reduce the blocking artifacts in block based DCT decoded image for mobile devices that has allocation of the restricted resource. This algorithm uses the adaptive deblocking filter to remove grid noise and ringing noise in monotone areas. To decide whether monotone region or not, we introduce a notion of Flatness. Also, a new directional filter is utilized to get rid of staircase noise and preserve the original edge component. The directional filter is applied according to the direction of edge, which is corrected in the process of directional vector… More >
Open Access
ABSTRACT
T. Y. Lin, H. C. Ping, T. Y. Yang, C. T. Chan, C. C. Yang1
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 115-122, 2009, DOI:10.3970/icces.2009.011.115
Abstract The artillery weapons have been developed from the thirteenth century to the present. Generally, it contains a gun body and a gun mount. The gun body consists of a barrel, a breech, a breechblock, and a muzzle brake. In addition, the gun mount is composed of recoil mechanisms, elevating mechanisms, traversing mechanisms, and supporting parts. Among these parts, the muzzle brake and recoil mechanism can reduce the mass recoil force during firing, and push the gun body back to the original position after firing. Before the mid-nineteenth century, general guns did not assemble any device having the cushioning effect. For… More >
Open Access
ABSTRACT
Yangkyun kim1, Sungcho Kim2, Jongwook Choi2, Jeong Soo Kim2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 123-124, 2009, DOI:10.3970/icces.2009.011.123
Abstract This paper analyzes computationally the flow field for the full geometry model of a commercial passenger airplane, Boeing747-400. The geometric dimension of an airplane was acquired by means of the reverse engineering technique adopting the photo scanning measurement. The steady three-dimensional viscous compressible flow field was calculated when the airplane cruises under side flow. The basic computational conditions were considered as the same to those of Boeing 747-400's cruising state, i.e., the atmospheric condition at 13 km above the sea level and Mach number of 0.85. The boundary conditions are the same that the freestream with side flow approaches to… More >
Open Access
ABSTRACT
Hun Jung1, Jin Seok Kim1, Jeong Soo Kim2, Jeong Park3
The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 125-126, 2009, DOI:10.3970/icces.2009.011.125
Abstract An injector plays an important role in the process of an efficient combustion in liquid-rocket engines (LRE) because it affects the evaporation rate of liquid fuel through spatial distribution and atomization of spray droplets. This paper is focused on the injection performance of a small LRE-Injector by employing the spray characteristic parameters made up of the velocity components, mean diameter, turbulence intensity, span (width of drop size distribution), number density, and volume flux of spray droplets. An experimental investigation is carried out with the aid of a dual-mode phase Doppler anemometry (DPDA) according to the injection pressure variation and along… More >
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