I.S.Hwang, W.Kang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.2, pp. 37-38, 2011, DOI:10.3970/icces.2011.019.037

Abstract Recently composite materials are widely used in the building of transport airplanes. The first significant application of composite materials in commercial transports was an all composite rudder for A300/310 by Airbus in 1983. In 1985, Airbus introduced a composite vertical tail fin in the same airplanes. With the success of A300/310, Airbus introduced a full composite tail structure for A320. The composite weight of A320 is totaled to 15% of structure weight. In the late of 1970, NASA and major airframe companies such as Boeing, Lockheed, MD started the ACEE program. The main goal of this program was to reduce… More >

Chung-Lun Kuo, Chein-Shan Liu, Jiang-Ren Chang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.2, pp. 35-36, 2011, DOI:10.3970/icces.2011.019.035

Abstract In this study, the exponentially convergent scalar homotopy algorithm (ECSHA) is proposed to solve the nonlinear optimization problems under equality and inequality constraints. The Kuhn-Tucker optimality conditions associated with NCP-functions are adopted to transform the nonlinear optimization problems into a set of nonlinear algebraic equations. Then the ECSHA is used to solve the resultant nonlinear equations. The proposed scheme keeps the merit of the conventional homotopy method, such as global convergence, but the inverse of the Jacobian matrix is avoid with the aid of the scalar homotopy function. Several numerical examples are provided to demonstrate the efficiency of the proposed… More >

Cheng-Yu Ku, Chein-Shan Liu, Weichung Yeih, Chia-Ming Fan

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.2, pp. 33-34, 2011, DOI:10.3970/icces.2011.019.033

Abstract In this paper, a novel method, named the perturbed dynamical method, is proposed to solve nonlinear systems whose Jacobian matrix is singular. The concept of the proposed method roots from the conventional homotopy method but it takes the advantages of converting a vector function to a scalar function by using the square norm of the vector function to conduct a scalar-based homotopy method. Then, a small parameter, which is similar to the perturbation theory, is introduced to the singular systems of nonlinear equations such that the modified singular systems of nonlinear equations become nonsingular and the asymptotic solutions may be… More >

Y.C. Liu, C.M. Fan, H.F. Chan, S.S. Hsiao

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 31-32, 2011, DOI:10.3970/icces.2011.019.031

Abstract The harbor oscillation problem, which is governed by inhomogeneous Helmholtz equation, is analyzed by the combination of the method of fundamental solutions (MFS) and method of particular solutions (MPS). The governed inhomogeneous Helmholtz equation is derived from the mild-slope equation and potential theory. The numerical solutions of the velocity potential of the harbor oscillation problem are decomposed as the homogeneous solution and the particular solution. While the particular solution is obtained by the MPS, the MFS is adopted to analyze the homogeneous solution. The particular solution is expressed as the linear combination of radial basis function, as the homogeneous solution… More >

H.F. Chan, C.M. Fan

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 29-30, 2011, DOI:10.3970/icces.2011.019.029

Abstract The inverse boundary optimization problem, which is governed by Helmholtz equation, is analyzed by the modified collocation Trefftz method (MCTM) and the exponentially convergent scalar homotopy algorithm (ECSHA). In the inverse boundary optimization problem, the position for part of boundary with given boundary condition is unknown, and the position for the rest of boundary with additionally specified boundary conditions is given. Therefore, it is very difficult to handle the boundary optimization problem by any numerical scheme. In order to stably solve the boundary optimization problem, the MCTM, one kind of boundary-type meshless methods, will be adopted in this study, since… More >

Takaya Kobayashi, Yasuko Mihara, Fumio Fujii

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 27-28, 2011, DOI:10.3970/icces.2011.019.027

Abstract In designing a modern lightweight structure, the determination of the critical buckling load in an ideal condition is not sufficient. Clarifying the postbuckling behavior is also required. One reason is to estimate the effect of practically unavoidable imperfections on the critical load and another reason is to evaluate the ultimate load-carrying capacity of the structure. For the buckling problem of circular cylindrical shells under axial compression, experimental results showed that after the primary buckling, the secondary buckling occurred accompanied by successive reductions in the number of the circumferential waves at every path-jumping. In this paper, we traced this successive buckling… More >

Yu-Cheng Liu, Yin-Sung Hsu, Jin H. Huang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.019.025

Abstract This paper presents the result of a theoretical study on a new fluid density measuring concept which uses the effect of external fluid loading on a vibrating thin plate. The underling physical principle of this concept is that the resonance frequencies of an immersed vibrating plate change with the surface impedance changes caused by the mass density variations of the external fluid. In this paper, the analytical solutions of resonance frequencies with specific gravity are demonstrated by using the finite element simulation, COMSOL. The theoretical analysis presented in this paper shows that the resonance frequencies of an immersed vibrating thin… More >

Li-Shin Lu

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.019.023

Abstract Sieve shaker is widely used in industrial and experimental processes for sieving granular material. With simply mechanical motion and convenient replacement of sieves, sieve shaker is also an appropriate device to be employed for the research of particle sieving. This study uses an experimental system of sieve shaker which can measure the sieving efficiency in real time to investigate the sieving performance of granular material. Two kinds of glass bead with different diameters, 1 mm and 5 mm, are used as the granular material to explore the influences of vibrating condition, size of mesh hole and thickness of granular layer… More >

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 simulation and experimental test are… More >