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[구조강도부문] ZZ-SPR을 이용한 Pollution Error의 추정에 관한 연구
편수범(Soo-Bum Pyun),유형선(Hyeong-Seon Yoo) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study we focus on the estimation for the pollution error by using ZZ-SPR. simply denoted as Zienkiewicz & Zhu Superconvergent Patch Recovery. The error resulted from the conventional error estimators is equivalent to the local error. Moreover. in the case of unsmooth solution problem with a polygonal domain such as L-shape. the local error estimates are much smaller than the pollution error ones. Therefore. the estimation of the pollution error as well as the pollution adaptive mesh has a large effect on the accuracy of the solution. Thus we use the ZZ-SPR for estimating the pollution error. Subsequently. we emphasize on the necessity for calculation of the pollution error by comparing the pollution error estimate with the local one.
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유형선(Yoo Hyeong Seon),편수범(Pyun Soo Bum) 한국철도학회 1999 철도저널 Vol.2 No.3
In this paper, made was a study on a mesh generation method based on the pollution error. This method is designed for the control of the pollution error in any patch of elements of interest. It is a well-known fact that the pollution error estimates are much more than the local one. When the pollution error is significant, nothing can be said about the reliability of any estimator based on local computations in the patch. Reliable a posteriori error estimation is possible by controlling the pollution error in the patch through proper design of the mesh outside the patch. This design is possible by equally distributing the pollution error indicators over the mesh outside the patch. The mesh generated from the conventional feedback pollution-adaptive mesh generation algorithm needs many iterations. Therefore, the solution time is significant. But the remeshing scheme in the proposed method was used here. It was shown that the pollution-adaptive mesh improves the E.I., simply denoted as Effectivity Index, on the patch of interest, and the pollution error reduces less than the local error.
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유형선(Hyeong-Seon Yoo),윤성호(Seong-Ho Yun),변상윤(Sang-Yun Pyun),편수범(Soo-Bum Pyun) 한국철도학회 2000 철도저널 Vol.3 No.3
The rubber wheel-type AGT has two major kinds of bogie; one is the bogie type and the other steering one. Both are important vehicular structure to support the whole running vehicle and passenger loads. This paper deals with the static analysis for the two types of bogie frame subjected to combined external forces, as well as independent ones specified in UIC 515-4. Furthermore, the dynamic analysis is performed under vibrational loading conditions so as to compare dynamic characteristics, Numerical results by using commercial packages, I-DEAS and NASTRAN show that maximum stresses do not exceed the yield strength level of material used for both bogies. From an overall viewpoint of strength, the bogie type turns out to be superior to thc steering type except for the case of a lateral loading. It is also observed that the steering type shows a characteristics of low frequency behavior during a course of searching for structurally weak areas to bc stiffened. The vibrational fatigue analysis for each bogie frame depends on the loading time history conditions which is applied Time History Central Database List in the NASTRAN package. Subsequently, the fatigue life of bogie type is longer than the steering type.
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