Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2001.06a
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- Pages.686-691
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- 2001
The calculation of refined semi-analytic sensitivity based on the hybrid element
혼합 요소에서의 개선된 민감도 계산법
Abstract
Structural optimization often require the evaluation of design sensitivities. The Semi Analytic method(SAM) is popular for shape optimization because this method has several advantages. But when relatively large rigid body motions are identified for individual elements, the SA method shows severe inaccuracy. In this paper, the improvement of design sensitivities corresponding to the rigid body mode is evaluated by exact differentiation of the rigid body modes. Moreover, the error of the SA method caused by numerical difference scheme is alleviated by using a series approximation for the sensitivity derivatives and considering the higher order terms.