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Skuteczność hybrydowej metody optymalizacji w rozwiązywaniu zadań o zróżnicowanej charakterystyce

100%

Twardochleb M. , Rychcicki R.

2009

tom nr 4 (21)

135-145

The main research objective of this paper is the development, analysis, implementation and determination of the efficiency of hybrid optimization methods applied to a variety of mathematical concepts describing real-life problems which involve a large number of variables. The optimization is carried out by a hybrid serialized cascading procedure which combines several different sub-procedures with dissimilar characteristics, sharing the same objective function. During the efficiency-determination phase, several effectiveness tests were conducted, comparing the hybrid method with other optimization techniques.

O kryteriach kształtowania konstrukcji

72%

Woliński S.

tom z. 58, nr 1

399-408

The paper deals with some aspects of shaping criteria for design of building structures. Shaping of structures was defined by prof. W. Zalewski as "qualitative approach to optimization of the flow of forces in a structure based on the rational principles of their physical and geometrical assessment". Traditionally, the least weight criterion of completely deterministic structures (deterministic structural properties, materials and loads) are considered in that type of structural optimization. While there is a certain elegance about these solutions, they are not robust and even small variations in loading pattern, material and geometrical properties can cause a structure designed to such an optimal solution to fail. Optimization criteria based on requirements recommended in the Eurocode are briefly reviewed. Two probabilistic criteria, namely the maximum reliability and the minimum risk are presented and discussed in detail. The minimum risk criterion provides in especial optimization possibilities with respect to the technical design code criteria and to both the quantitative and qualitative requirements.