Characterizing a Racing Damperâ s Frequency Dependent Behavior with an Emphasis on High Frequency Inputs
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Utilizing experimental testing, with a state of the art damper dynamometer, and computer simulation with a parametric damper model developed for this study, several inputs and key parameters are tested, and the damperâ s frequency dependent nature starts to emerge. Constant peak velocity sinusoidal and sinusoidal sweep inputs are used for the experimental testing. The results show that as the input frequency is increased, the damperâ s output force lissajou transitions from the characteristic shape of a damperâ s lissajou to a shape characteristic of a springâ s lissajou. This change in the lissajou is linked to hysteretic effects, which includes the gas spring effect. Damper parameters that are suspected to contribute to the hysteretic effects are explored with computer simulation and additional experimental testing. The results from this show that fluid preparation, fluid type, initial gas pressure, and friction have a predictable effect on the damperâ s output force.
- Masters Theses