some metal surfaces, rubbed against each other squeaks in a shrilling high frequency. Why? What is the role of surface roughness, friction factor, geometric shape, stress distribution,solid and medium sound velocity, strength, resilience and microstructure to frequency spectrum of the sound? Are there any set of differential equations that describe this phenomena? How to construct a model concerning the phenomena?
This phenomenon is called "stick-slip" and it is caused by the friction and surface roughness. however, the resultant noise is governed by the geometry of the components. For example: a violin bow rubs against a tuned string, and you hear a combination of a saw-toothed waveform of the frequency of the string, and not the bow, or the geometry of the horse hairs in the bow, nor the rosin that causes the high friction. Theerfore, concentrate on modelling the components, and don't concentrate on the surface roughness as this only causes a broad-band exitation of the ctuned omponent resonance. you hear. I hope you understand my explanation? Best regards, Mike.
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