Interpretation of rubbing noise radiated from a pin-on-disc configuration.

The sound radiated due to rubbing action by a disc in contact with a nominally stationary pin is modelled by combining the normal force excitation at the responses. The contact forces are associated with contact vibrations that are developed as surface irregularities are swept through the contact region. The acoustic power radiated in a test apparatus is compared with that computed from the measured responses of the individual elements subjected to the measured force input. The calculated values are shown to be in good agreement with measurements. The frequency range studied included the disc coincidence frequency, and three plate modes and enclosure modes. A relatively straight-forward physical interpretaton of the contributions of these effects to the radiated noise is shown to be possible. (A)