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Hello, First of all i want to explain what i did so far. I performed a frequency response modal Analysis to investigate the dynamic stiffness of my component in Hypermesh/Optistruct. I performed an Analysis with Optistruct and my results are the frequency-depended Displacement (s) and SPC-Force (F). Then i plotted the dynamic stiffness by calculating Cdyn=F/s. The results are exactly what i expected. After that i changed the structure of my component using Mesh Morphing and recalculated the dynamic stiffness of the changed component. This had a huge effect on the dynamic stiffness. I saved the morph-changes as shapes and created a shape design variable. I want to do a shape optimization to reduce (minimize) the dynamic stiffness. Now my questions: 1. Is it possible to do a shape-optimization to reduce the dynamic stiffness (reduce the quotient F/s) with optistruct? 2. When it is possible, can you give me a hint, how i have to proceed with the Responses, constraints and objectives for the optimization? Regards, Fatih Uysal