Abstract
An active control colloidal damper (ACCD), which is able to change its damping and elastic characteristics according to a specific type of external excitation is investigated. Control of the damping coefficient and spring constant is achieved by using a pressure controlling device, i.e., either by using a pump equipped with a servo-valve to adjust the pre-pressruization level of the ACCD cylinder, or by using an irradiating device to adjust the diameter of the silica nanopores (adjustment of the lyophobic coating thickness). Area of the recorded hysteresis gives information on the damping characteristics, and the slope of the central line of the same hysteresis gives information on the elastic characteristics. By increasing the pre-pressure or by decreasing the diameter of silica nanopores, the spring coefficient increases. Optimum pre-pressurization level to maximize the dissipation is found and the sensitivity of ACCD is evaluated
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