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The work presents the results of numerical investigations of the effect of the load and velocity parameters of a mining truck moving over a long descending grade upon thermal conditions of the multidisc oil-cooled brake (MDOB) operation. The initial boundary-value problem for the heat transfer in the MDOB friction pair under frictional heating has been formulated and solved by the finite-element method. The computations performed for the friction pair of high-carbon steel against frictional composite material based on polymer binders. The effect of the load-velocity operation parameters on the thermal conditions of the mining truck MDOB was studied by way of a multifactor numerical experiment using a mathematical model of heat transfer in the MDOB friction pair.

Fighting vibration and noise in vehicle brakes and transmissions consists today mainly in modifying design of friction joints, which involves alteration of the rubbing pair geometry or introduction of new damping elements into the structure, e.g. insulators. Although the beneficial effect of damping materials on brake NVH was supported by a large number of numerical and experimental investigations, the effect of composition and structure of frictional materials on their damping properties is still not explored adequately. The paper presents investigation results of the effect of composition and structure of frictional materials employed in brakes and transmissions on their dynamic properties and vibroacoustic activity of actual friction joints. The results obtained present the dynamic properties of the materials depending on the type of polymer matrix, fiber filler orientation and dimensions, cure degree of the binder and the presence of plasticizer in the matrix phase.