Abstract
Sliding of a coffee cup and a dish on table top emits the friction sound. This paper deals with the effects of the composition of table top and physical qualities of the surface on the sound level of the friction sound and the mechanism of the friction sound emission. Japanese oak veneers (0.6mm and 1.4mm in thickness) and meramine sheets were overlaid, and an ethylene-propylene rubber sheet was also sandwiched as an absorbing material between surface material and base boards (plywood and particle board).The results obtained are as follows:(1) The power spectrum of the friction sound is composed of tap tone and noise components.(2) The regression analysis shows that the sound level can be represented quantitatively by the apparent surface hardness and the interval of surface roughness.(3) Synthesizing of the friction sound from tap tone of a board shows that the friction sound originates from the collision of the projection at the bottom surface of a cup and that of a board. This is the reason why the power spectrum of the friction sound resembles that of the tap tone.(4) In order to reduce the sound level of friction sound the followings are effective: the surface is not so hard, the sandwiching of absorbing sheet reduces apparent hardness and the sound level, and the surface roughness is not so fine.
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