S. Chai et al., An application of relative difference quotient algorithm to topology optimization of truss structures with discrete variables, STRUCT OPT, 18(1), 1999, pp. 48-55
In this paper, the definitions of cross-sectional variable and topological
variable are advanced, and a mathematical model of topology optimization of
truss structures with discrete variables including two kinds of variables
is developed. The model has considered the coupling relations between cross
-sectional variables and topological variables, so that it reflects the inn
ate characteristics of topology optimization as a combinatorial optimizatio
n problem. Moreover, problems such as "limit stress" and "singular solution
of structural optimization" can be overcome by using this model. The model
of topology optimization of truss structures with discrete variables inclu
ding two kinds of variables is solved directly by using the relative differ
ence quotient algorithm. The computational results are satisfactory and som
e new topologies and better solutions are obtained.