FUNDAMENTAL STUDY ON FRICTIONAL NOISE - 3. THE INFLUENCE OF PERIODIC SURFACE ROUGHNESS ON FRICTIONAL NOISE.

Abstract

Experimental and theoretical studies were done on the frictional noise without lubrication when a steel rod is pressed in the radial direction on a rotating thick disk with periodic corrugation surface. When the surface roughness becomes larger, various resonances are observed in the frictional noise and acceleration because of the non-linearity such as loss of contact between the rod and the disk. That is, higher harmonic resonances, subharmonic resonances, higher-subharmonic resonances of the fundamental lateral natural frequency of the rod, the fundamental and higher harmonic resonances of the higher mode of the rod are observed. Moreover, the differential and additional harmonic resonances of the fundamental and 2nd lateral natural accelerations of the rod are also observed with a long rod. The calculated results by considering the corrugation surface roughness as the external force almost agree with the experimental results. However, subharmonic, higher-subharmonic and differential and additional harmonic resonances do not occur so remarkably as those in experimental results.