Abstract
Harmonic vibration of structures having parts with different stiffness is studied. A combined FEA/SEA approach is advanced where stiffer parts (with a low modal density) are analyzed using the finite element method (FEA) and weaker parts (with a high modal density) are analyzed using a Statistical Energy Analysis (SEA). The approach proposed employs an optimization procedure where the difference between supplied active power and the power dissipated in the structure is minimized. Sectional forces in points connecting the stiff and weak parts are then used as design variables. To reduce the number of degrees of freedom in the FE-part during the optimization procedure, exact dynamic substructuring is introduced. The potential to cover a large frequency interval is demonstrated in a numerical example where the harmonic response of a truck is studied.
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