A fundamental study of frictional noise. (1st report, the generating mechanism of rubbing noise and squeal noise).

Abstract

The mechanisms of noise generation during unlubricated friction were studied using a test rig in which a rod, clamped at one end, was pressed against a rotating disc in the radial direction. Two types of noise were encountered; a .rubbing' noise, identified with low friction coefficient; and squeal, produced when the friction coefficient was hihger (as a result of wear of the rod). The squeal mode was of higher frequency and higher sound pressure leve (by 20-30dB). Noise generation was attributed to self-excited lateral vibrations of the rod. (G.P.)