Dynamic self-adjustment to external force effect in a nominally stationary friction joint

Abstract

It is shown experimentally that the external force effect on a nominally stationary friction joint causes dynamic self-adjustment of the tribosystem to it. The self-adjustment is directed to minimization of energy loss and the level of the relative inertia forces that act in the system. Under conditions of alternating force effect, this corresponds to the state of contact antiresonance. Such self-adjustment is provided by inertial-frictional feedbacks using various degrees of freedom of deformable solids that are in contact. It is found that frictional self-oscillations are a natural mode of dynamic self-adjustment under severe inertial loads and that subsequent fine self-adjustment operates as low-amplitude fretting, which reflects the necessity of dynamic contact displacements to minimize energy loss in the joint under alternating external force effect.