| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Research Abstract |
The structural analysis and the optimization process are basically coupled. In other words, the optimum point is found through the interaction between structural responses and design variables. It is natural to expect that a search in the extended space which includes the mechanical freedoms of the structure as well as the design variables will perform better than that in the design variable space only. It is well known that the so-called strong coupling method is indispensable for fluid-structure interaction problems with strong coupling effects. This idea, which is nothing but the principle of the integrated method, is incorporated in the present study in order to enhance the system matrix of the Newton method, in the framework of the nested approach. Namely, the system equation is first derived in the extended space, and then it is condensed. After some manipulation, a compact form of the system matrix equation is derived, which is similar to that in the conventional Newton method. It can be solved only for the design variables, and the computational cost is about the same as that for the conventional method, but it substantially searches for the solution in the extended space. In the present research, the formulation based on the above idea is shown. The resultant system matrix is compared with that of the conventional method. Finally, the potential of the proposed method is exemplified in some simple elastic-plastic problems.
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