M. Matsumoto et al., MEASUREMENT OF SLIDER-DISK COLLISION FORCES USING ACOUSTIC-EMISSION SOURCE WAVE ANALYSIS, Tribology transactions, 36(4), 1993, pp. 736-740
A new measuring technique has been developed for the purpose of analyz
ing the slider/disk collision phenomena. Very small piezoelectric sens
ors are mounted on the slider. These sensors detect elastic waves (aco
ustic emission) in the slider which are induced by the collisions at t
he slider rail surface. In order to obtain input collision force quant
itatively, the transfer function of the slider, sensor, and electric c
ircuit is measured by the breaking pencil lead method. The inverse ope
ration is also performed by using source wave analysis. Force amplitud
e of the order of 4-20 mN and contact time of the order of 5-22 mus ar
e detected. Two types of collision force are observed. One has large a
mplitude and narrow time width and is conjectured to arise from collis
ions with hard projections. The other has small amplitude and wide tim
e width and is conjectured to arise from collisions with soft projecti
ons.