8 April 2008 Smart colloidal dampers with on-demand controllable damping capability
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Abstract
Smart dampers with on-demand controllable damping curves are key components for semi-active vibration control of structures. Smart dampers utilize friction or viscosity to dissipate mechanical energy by heat. The potential thermal problems are their major drawbacks. Novel colloidal dampers are recently developed with low-heat generation and high damping efficient, they are, however, passive and with no on-demand controllable damping capability. In this paper, we propose a smart colloidal damper by employing water-based ferrofluids in damping media. We find that the corresponding damping hysteresis loops can be affected by applied magnetic fields significantly and rapidly. We further retrieve the instant stiffness and damping coefficient of the smart colloidal dampers from the measured hysteresis loops. It is shown that the negative stiffness and the negative damping coefficient may occur during the operation of the smart colloidal dampers.
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G. Y. Zhou, G. Y. Zhou, B. Johnson, B. Johnson, L. Z. Sun, L. Z. Sun, } "Smart colloidal dampers with on-demand controllable damping capability", Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 69320R (8 April 2008); doi: 10.1117/12.775847; https://doi.org/10.1117/12.775847
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