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- 주제어 : Sub-Structuring Scheme(부구조화 기법) (검색결과 4 건)
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최동수(Dongsoo Choi),김현기(Hyungi Kim),조맹효(Maenghyo Cho) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.2
An iterated improved reduced system (IIRS) procedure combined with sub-structuring scheme for nonclassically damped structural systems is presented. For dynamic analysis of such systems, complex eigenproperties are required to incorporate properly the nonclassical damping effect. In complex structural systems, the equations of motion are written in the state space form. Thus, the number of degrees of freedom of the new equations of motion and the size of the associated eigenvalue problem required to obtain the complex eigenvalues and eigenvectors are doubled. Iterated IRS method is an efficient reduction technique because the eigenproperties obtained in each iteration step improve the condensation matrix in the next iteration step. However, although this reduction technique reduces the size of problem drastically, it is not efficient to apply this technique to a single domain finite element model with degrees of freedom over several thousands. Therefore, for a practical application of the reduction method, accompanying sub-structuring scheme is necessary. In the present study, iterated IRS method combined with sub-structuring scheme for nonclssically damped structures is developed. Numerical examples demonstrate the convergence and the efficiency of a newly developed scheme.
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축소시스템과 부구조화 기법의 연동을 통한 대형구조물 해석 기법 연구
김현기(Hyun Gi Kim),조맹효(Maenghyo Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Previously reported reduction schemes approximate the lower eigenvalues that represent the global behavior of the structures. But, they are not efficient to be applied to large-scaled problems because these schemes require considerable amount of computing time in constructing reduced one from the original large-scaled systems. In addition, the selection of the primary degrees of freedom might be localized to cause the excessive emphasis of the lower mode or lost of the important modes. In the present study, a new reduction method combined with the sub-structuring scheme is proposed. For the construction of the final reduced system, the system of each domain subdivided into primary, slave and interface degrees of freedom. It is remarkably efficient and accurate compared to full-scale system. Numerical examples demonstrate that the proposed method saves computational cost effectively and provides a reduced system which predicts accurate eigen-pairs of global system.
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축소시스템과 부구조화 기법의 연동을 통한 대형구조물 설계 기법 연구
조맹효(Maenghyo Cho),김현기(Hyun Gi Kim),김혁(Hyuk Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In the present study, sizing and shape optimization is performed based on the reduced system of large-scaled problem. In the analysis part, to achieve efficiency and reliability of computation, two-level condensation scheme is applied. In the construction of reduced system of large scaled problems, it is much faster to use substructuring scheme. Thus, in the present paper, two-level reduction method combined with substructuring scheme is employed. Once the reduced system is constructed, then it is straightforward to obtain design sensitivities from the reduced system. We used semi-analytic method to obtain design sensitivities. Performance of the efficiency and reliablity of the present reduction method in large-scaled system in the structural optimization problem is demonstrated through the numerical examples. The present framework of reduction method should serve as a fast and reliable design tool in analysis and design of large-scaled dynamic problems.
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반복적인 동적 축소법과 대형 구조물 해석을 위한 부구조화 기법의 적용
최동수(Dongsoo Choi),조맹효(Meanghyo Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This work presents an iterative dynamic condensation procedure combined with sub-structuring scheme for large structures. Iterative dynamic condensation techniques are usually more efficient than others because the dynamic condensation matrix is updated repeatedly until the desired convergent values are obtained. However, using these methods simply for large structures causes very expensive computational cost and even makes analyses impossible because of the limited computer storage. Therefore, the application of subtructuring scheme is necessary to calculate eigenproperties for large structures. Because the large structures are subdivided into several (or more) sub-domains, the construction of dynamic condensation matrix does not need much computation cost in every iteration. This makes the present method much more efficient to compute the eigenpairs both in lower and higher modes. Numerical examples are applied to demonstrate the features of this method.
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