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http://dx.doi.org/10.3795/KSME-A.2006.30.1.066

Structural Optimization for Non-Linear Behavior Using Equivalent Static Loads by Proportional Transformation of Loads  

Park Ki-Jong (현대자동차(주))
Kwon Yong-Deok (LG전자(주))
Song Kee-Nam (한국원자력연구소)
Park Gyung-Jin (한양대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.30, no.1, 2006 , pp. 66-75 More about this Journal
Abstract
Nonlinear response structural optimization using equivalent static loads (NROESL) has been proposed. Nonlinear response optimization is solved by sequential linear response optimization with equivalent static loads which are generated from the nonlinear responses and linear stiffness matrix. The linear stiffness matrix should be obtained in NROESL, and this process can be fairly difficult for some applications. Proportional transformation of loads (PTL) is proposed to overcome the difficulties. Equivalent static loads are obtained by PTL. It is the same as NROESL except for the process of calculating equivalent static loads. PTL is developed for large-scale probems. First, linear and nonlinear responses are evaluated from linear and nonlinear analyses, respectively. At a DOF of the finite element method, the ratio of the two responses is calculated and an equivalent static load is made by multiplying the ratio and the loads for linear analysis. Therefore, the mumber of the equivalent static loads is as many as that of DOF's and an equivalent static load is used with the reponse for the corresponding DOF in the optimization process. All the equivalent static loads are used as multiple loading conditions during linear response optimization. The process iterates until it converges. Examples are solved by using the proposed method and the results are compared with conventional methods.
Keywords
Equivalent Static Load; Proportional Transformation of Load; Nonlinear Response Optimization; Structural Optimization; Nonlinear Response Optimization Using Equivalent Static Loads(NROESL);
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Times Cited By KSCI : 4  (Citation Analysis)
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