Abstract
This paper presents a new theory on frictional vibration observed in wet clutches or wet brakes, considering poroelastic characteristics of paper-based friction material. A stability criterion is derived on the assumption that vibrations in two directions, tangential and normal, are coupled. In comparison with experimental results, it is confirmed that the criterion can predict the stability limit more accurately than the conventional one, which does not consider deformation of friction material and depends only on the gradient of friction coefficient to sliding velocity. Based on the criterion, influences of material properties on stability to frictional vibration are discussed.
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