Abstract
The direct dynamic stiffness method (DDSM) allows low and midfrequency structural acoustic analysis of complex structures containing beam- and plate-like members and may be used in conjunction with other models like finite-element (FE) models. The DDSM description of beam-like structures involves closed-form relationships between transverse, axial, and torsion loads and displacements, and is accurate at frequencies below a beam-like structure’s fundamental cross section resonance frequency. Transverse shear and rotational inertia effects are included. Modeling of free layer and granular material damping treatment is discussed, and measurements on treated tubes are compared to predictions. A comparison is made between DDSM and FE solutions of a truss structure. The predictions are essentially identical, but the DDSM model is 91% smaller and requires 90% less computation.
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