8 April 2008 Damping performance of colloidal dampers
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Dampers are the key devices for vibration control of structures. The mechanisms of current dampers are internal friction or viscous flow to dissipate external mechanical energies by heat. The high-heat generation potentially causes thermal problems to decrease the durability of dampers. Owing to the surface-tension dominated nanoflow on the porous particles, colloidal dampers have been recently developed with low-heat generation and high damping efficiency. In this paper, a new type of colloidal dampers are designed and fabricated. Its heat generation and hysteresis loops are tested. It is found that the heat generation of the colloidal dampers is below 4% of that of hydraulic dampers with the same energy dissipation capacity. Meanwhile, the hysteresis loops reveal that the colloidal dampers are highly nonlinear devices. We introduce an efficient algorithm to retrieve its instant stiffness and damping coefficients from measured hysteresis loops under cyclic excitations at different frequencies. The retrieved stiffness and damping coefficients are plotted against damping forces or inner pressures. We find that, at low frequencies, the colloidal dampers exhibit the states with negative stiffness and negative damping coefficients; nevertheless, at the frequencies above 6Hz, both the stiffness and the damping coefficients are positive. Frequency is one of the key parameters dominating the damping mechanism of the colloidal dampers.
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G. Y. Zhou, G. Y. Zhou, R. Li, R. Li, B. Johnson, B. Johnson, L. Z. Sun, L. Z. Sun, } "Damping performance of colloidal dampers", Proc. SPIE 6934, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2008, 693418 (8 April 2008); doi: 10.1117/12.775857; https://doi.org/10.1117/12.775857

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