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Unformatted text preview: ω : Hysteretic Damping 4 Structural damping is usually incorporated into models by defining a complex stiffness that is valid when considering the sinusoidal response behavior of the system: where η =h/K is called the loss factor. Note that by using this form for the stiffness, we are enforcing the dependence on the displacement amplitude, phasing (with velocity), and not requiring the force to increase with frequency: Hysteretic Damping 5 Coulomb Damping 6 Coulomb friction (damping) produces an interesting type of free decay response: Coulomb Damping 7 To calculate the equivalent viscous damping coefficient, we equate the energy lost per unit cycle in the case of Coulomb friction to the energy lost due to viscous effects: What does this viscous damping coefficient imply about the amount of damping present in the oscillation?...
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This document was uploaded on 12/23/2011.
 Fall '09

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