Journal
FINITE ELEMENTS IN ANALYSIS AND DESIGN
Volume 37, Issue 5, Pages 447-465Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0168-874X(00)00057-3
Keywords
genetic algorithms; structural optimization; topology design; truss optimization
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Optimization of truss-structures for finding optimal cross-sectional size, topology, and configuration of 2-D and 3-D trusses to achieve minimum weight is carried out using real-coded genetic algorithms (GAs). All the above three optimization techniques have been made possible by using a novel representation scheme. Although the proposed GA uses a fixed-length vector of design variables representing member areas and change in nodal coordinates, a simple member exclusion principle is introduced to obtain differing topologies. Moreover, practical considerations, such as inclusion of important nodes in the optimized structure is taken care of by using a concept of basic and non-basic nodes. Stress, deflection, and kinematic stability considerations are also handled using constraints. In a number of 2-D and 3-D trusses, the proposed technique finds intuitively optimal or near-optimal trusses, which are also found to have smaller weight than those that are reported in the literature. (C) 2001 Elsevier Science B.V. All rights reserved.
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