en Applications Applications پژوهشي Research In this paper, topology optimization is utilized for damage detection in three dimensional elasticity problems. In addition, two mode expansion techniques are used to derive unknown modal data from measured data identified by installed sensors. Damages in the model are assumed as reduction of mass and stiffness in the discretized finite elements. The Solid Isotropic Material with Penalization (SIMP) method is used for parameterizing topology of the structure. Difference between mode shapes of the model and real structure is minimized via a mathematical based algorithm. Analytical sensitivity analysis is performed to obtain derivatives of objective function with respect to the design variables. In order to illustrate the accuracy of the proposed method, four numerical examples are presented. structural health monitoring, mode expansion, damage identification, SIMP, topology optimization. 543 560 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-66-241&slc_lang=en&sid=1 F. Abdollahi 180031947532846001504 180031947532846001504 No S. M. Tavakkoli 180031947532846001505 180031947532846001505 Yes