Data dependent systems approach to modal analysis, Part II: Application to structural modification of a disc-brake rotor

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The Data Dependent Systems (DDS) methodology is used to determine the modal parameters of a disc-brake rotor. The rotor, due to its symmetry, causes the vibration induced disc-brake squeal phenomenon. This paper presents results from an experimental investigation to show how structural modification can be used to change the modal parameters of the rotor. The modal parameters from both the DDS method and from a Fourier analyzer based modal analysis package are presented. Each rotor was modelled with 60 points on three equally spaced diameters. For an unmodified free-free rotor (resting on packing foam) the DDS results indicate that a 60th order model was required, whereas a structurally modified disc-brake rotor required a 76th order model. The results indicate how the disc-brake rotor can be modified to reduce the squeal propensity in selected frequency ranges. © 1988 Academic Press Limited.

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Journal of Sound and Vibration