Damping Models for Shear Beams With Applications to Spacecraft Wiring Harnesses
Lesieutre, George A.
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Damping is an important aspect of aerospace sturctures designed to operate in dynamic environments. Wiring harnesses can significantly affect the dynamics of spacecraft structures. High-fidelity models of the coupled structure-cable dynamic system are needed to accurately predict launch loads and potential control system interactions. A beam model including first-order transverse shear can accurately capture the effects of cable mass and stiffness on dynamic response and provide insight into structural behavior. However, available time-domain damping models are inadequate for use in such a model- common proportional damping models predict modal damping that depends strongly and unrealistically on frequency. Inspired by a geometirc rotation-based viscous damping model that provides frequency-independent modal damping in an Euler-Bernoulli beam model, several time-domain viscous damping models are presented that exhibit weaker frequency dependence than proportional damping models. At low frequencies (bendingdominated modes), the models provide modal damping that is either directly or inversely proportional to the mode number. Model predictions compare favorably to available experimental data.