Abstract
The numerical non-stability of a discrete algorithm of topology optimization can result from the inaccurate evaluation of element sensitivities. Especially, when material is added to elements, the estimation of element sensitivities is very inaccurate, even their signs are also estimated wrong. In order to overcome the problem, a new incremental sensitivity analysis formula is constructed based on the perturbation analysis of the elastic equilibrium increment equation, which can provide us a good estimate of the change of the objective function whether material is removed from or added to elements, meanwhile it can also be considered as the conventional sensitivity formula modified by a non-local element stiffness matrix. As a consequence, a binary discrete method of topology optimization is established, in which each element is assigned either a stiffness value of solid material or a small value indicating no material, and the optimization process can remove material from elements or add material to elements so as to make the objective function decrease. And a main advantage of the method is simple and no need of much mathematics, particularly interesting in engineering application.
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Contributed by CHENG Geng-dong
Project supported by the National Natural Science Foundation of China (Nos.59805001, 50475150 and 10332010), the Key Science and Technology Research Project of Ministry of Education of China (No.104060), the Program for New Century Excellent Talents in University (No.050284) and the Post-Doctoral Science Foundation of China (No.2004036110)
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Mei, Yl., Wang, Xm. & Cheng, Gd. Binary discrete method of topology optimization. Appl Math Mech 28, 707–719 (2007). https://doi.org/10.1007/s10483-007-0601-z
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DOI: https://doi.org/10.1007/s10483-007-0601-z