Identification of damping and stiffness coefficients of a shape memory alloy wire mesh damper
Wire mesh dampers represent an alternative to reduce rotor vibration in oil-free turbomachinery including applications with extreme operating temperatures. These dampers are manufactured from weaving and successively compressing a strip of intertwined metal wires (metal fabric) to form a densely packed wire mesh ring. This paper presents the identification of the structural stiffness and damping coefficients of Nickel-Titanium (NiTi) wire mesh damper. The experiments include single frequency external excitation at different amplitude levels in a single axis (i.e. linear motions). The damper energy dissipation, characterized in terms of a dry friction coefficient and a structural loss factor, represents a combination of structural and dry friction (Coulomb) damping arising from the bending of the wires and their surface interaction, respectively. Results from this study indicate that that structural damping is the main source of energy dissipation, and that the system damping increases with vibration amplitude.
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