Doan An¹, Jae-Woo Lee², Sang Ho Kim¹, Yung-Hwan Byun¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 35-36, 2009, DOI:10.3970/icces.2009.011.035

Abstract As analysis methods for the individual CFD (Computational Fluid Dynamics) and FEM (Finite Element Method) analyses are matured, many researches are going on recently and several commercial software are available and ready to use, but the application of the method is limited to the specific or relatively simple geometry. When the configuration geometry is complex or operating conditions are difficult to impose, the meshing and re-meshing process between aerodynamic analysis and FEM analysis is not an easy task and commercial software have limitations to be applied to the specific problems.
Therefore, in this study, the aerodynamics-structure… More >

Dong-Hoon Kim¹, Sang-Wook Lee¹, Dong-Ik Cheon¹, Hwa-Suk Oh¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 33-34, 2009, DOI:10.3970/icces.2009.011.033

Abstract In general, accurate attitude information is essential to perform the mission. Two algorithms are well-known to determine the attitude through two or more vector observations. One is deterministic method such as TRIAD algorithm, the other is optimal method such as QUEST algorithm. This paper suggests the idea to improve performance of the TRIAD algorithm and to determine the attitude by combination of different sensors. First, we change the attitude matrix to Euler angle instead of using orthogonalization method and also use covariance in place of variance, then apply an unbiased minimum variance formula for more More >

chun-chi Li¹, chin-chiang Wang², yin-chia Su², yu-chen Chu², chia-chu Weng²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 31-32, 2009, DOI:10.3970/icces.2009.011.031

Abstract The aim of this paper was to establish the realistic breathing patterns in different exercise conditions by experimental measurement. Generally, the human inhalation rate varies from 15 L/min at rest to 135 L/min for intense exercise and the breathing cycles are varied with different exercise conditions. Previous author have used symmetric Weibel configuration to establish three realistic breathing patterns, i. e., resting (inhalation rate, 15 L/min), light activity (inhalation rate, 30 L/min), and moderate exercise (inhalation rate, 60 L/min). In this study, in addition to reconstructing the three realistic breathing patterns of above mention, we… More >

C.C. Chia¹, S.G. Jang¹, J.R. Lee², D.J. Yoon²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 29-30, 2009, DOI:10.3970/icces.2009.011.029

Abstract An ultrasonic propagation imaging (UPI) system consisted of a Q-switched Nd-YAG pulsed laser with 20 Hz-repetition rate and a motorized tilting mirror system for rapid scanning of target was developed. The system which requires neither reference data nor fixed focal length could be used for health monitoring of curved structures. If combined with a fiber acoustic wave PZT (FAWPZT) sensor, it could be used to perform inspection on hot target structures, which present formidable challenges to the usage of contact piezoelectric transducers mainly due to the Curie temperature limitation of transducers and debonding problem due… More >

C.S. Lin¹, S.C. Wang¹, K.D. Chou¹, T.C. Chen¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.1, pp. 27-28, 2009, DOI:10.3970/icces.2009.011.027

Abstract It is a common practice that most underground basements of buildings are utilized/developed for commercial purposes/stores in Taiwan. Many basement fires occurred and caused tremendous losses of human lives and properties in the past twenty years. Therefore protecting against basement fires in commercial buildings is of important concern in Taiwan. Smoke gases from a basement building fire might spread through corridors and ventilation systems to the entire building. This study utilizes Fire Dynamics Simulator (FDS) software to develop a computer simulation model for investigating a typical basement barbershop fire that occurred in 1993. The fire More >

Yong-Jun Jang¹, Hag-Beom Kim^1,2, Woo-Sung Jung¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.1, pp. 19-26, 2009, DOI:10.3970/icces.2009.011.019

Abstract In this study, fire simulations were performed to analyze the characteristics of the fire driven flow and the effects of the platform screen door on the smoke flow in the station, when the fire occurred in the center of the platform. Soongsil Univ. station (line number 7) was chosen which is the one of the deepest (47m) underground subway stations in the Seoul metro(SMRT). The parallel computational method was employed to compute the heat and mass transfer eqn's with 6 CPUs of the Linux clustering machine. The fire driven flow was simulated using FDS code More >

Emil Budescu¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.1, pp. 17-18, 2009, DOI:10.3970/icces.2009.011.017

Abstract For the visco-plastic materials of type Bingham fluid, like granular materials, the process of flow begins when the force F^ˉ, which variation is presented in figure 1, reaches the minimum value of shearing limit. More >

Eugen Merticaru, Emil Budescu

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.1, pp. 3-4, 2009, DOI:10.3970/icces.2009.011.003

Abstract The paper deals with the problem of motion of human upper limb so that to be ensured the success of the throw in basketball game. For the human upper limb there was considered the model of double pendulum. The classic equation of motion of the ball was correlated with the corresponding equation of motion for the upper limb, so that the ball to pass through the basket. It is well known that the trajectory of a thrown body is a parabola.
The equations of position and velocity of the hand are written and give the initial… More >

M. Tsuda¹, T. Asada¹, N. Ohno^1,2, T. Igari³

The International Conference on Computational & Experimental Engineering and Sciences, Vol.10, No.3, pp. 2-2, 2009, DOI:10.3970/icces.2009.010.097

Abstract In this study, homogenized elastic-viscoplastic behavior of plate-fin structures fabricated for compact heat exchangers is investigated. First, the homogenized behavior is numerically analyzed using a fully implicit mathematical homogenization scheme of periodic elastic-inelastic solids. A power-law creep equation is assumed to represent the viscoplasticity of base metals at high temperatures. The plate-fin structures are thus shown to exhibit significant anisotropy as well as compressibility in both the elastic and viscoplastic ranges of the homogenized behavior. Second, a non-linear rate-dependent macroscopic constitutive model is developed by utilizing the quadratic yield function proposed for anisotropic compressible plasticity. More >

Zone-Ching Lin¹, Ming-Long Huang¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.10, No.3, pp. 89-90, 2009, DOI:10.3970/icces.2009.010.089

Abstract The paper develops a two dimensional quasi-steady molecular staic model to simulate the vertical down press copper workpiece by down press the nanoscale depth of abrasive grains in different shapes. The research of the down pressing copper workpiece of abrasive grains in this paper uses the hexagonal close packed diamond abrasive grains to down press the perfect face-centered cubic copper. The paper's simulation of down pressing nanoscale depth model of abrasive grain by two dimensional quasi-steady molecular statics model is a step by step to down press copper workpiece by diamond abrasive grain. It is… More >