1 April 2009 Effect of load on active friction control using ultrasonic vibrations
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The ability to control the effective friction coefficient between sliding surfaces is of particular fundamental and technological interest for automotive applications. It has been shown that the friction force between sliding surfaces can be reduced by superimposing ultrasonic vibrations on the macroscopic sliding velocity. We developed a systematic approach based on experiments and models to describe and characterize the friction force between sliding surfaces in the presence of ultrasonic vibrations generated by a piezoelectric transducer. The controlling parameters in this study are static contact pressure, relative velocity, voltage, and frequency. Using a low power PMN-PT driver, we experimentally demonstrate a decrease of up to 68 % in effective friction coefficient and analytically show the underlying principle behind the friction reduction. The trends show a decrease in the effect with increasing sliding velocity and normal load. The results underscore the role of ultrasonic power in harnessing the friction control concept in applications.
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Shravan Bharadwaj, Shravan Bharadwaj, Marcelo J. Dapino, Marcelo J. Dapino, } "Effect of load on active friction control using ultrasonic vibrations", Proc. SPIE 7290, Industrial and Commercial Applications of Smart Structures Technologies 2009, 72900G (1 April 2009); doi: 10.1117/12.817052; https://doi.org/10.1117/12.817052

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