442 D. Xu et al. 750 700 650 600 550 500 450 400 350 300 250 102 103 104 Number of nodes Eigenfrequency [Hz] 105 Fig. 44.2 Convergence of the first three numerical eigenfrequencies. Note that the eigenfrequencies in this figure don’t correspond to the final result Fig. 44.3 Left: CAD model of fin. Right: FE model of fin Fig. 44.4 Model updating procedure with Matlab and ANSYS communication between these two programs, as shown in Fig. 44.4. For each iteration step Matlab Optimization defines a search direction for proper material properties and writes corresponding APDL code into APDL.txt and calls for ANSYS to execute it in background. After the modal analysis is performed in ANSYS, the results including modal data are written into Result.txt, which will be read by MATLAB, so that the value of objective function defined in Sect. 44.2 can be calculated. In order to update the FE model of the fin an Active Set algorithm in Matlab Optimization Toolbox [10] was used to optimize
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