Finite element study of belt-drive frictional contact under harmonic excitation

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Finite element study of belt-drive frictional contact under harmonic excitation

Leamy, M.J. / Meckstroth, R.J. / Wasfy, T.M.

Belt-drives that are driven by internal combustion engines, such as automotive accessory drives, are subjected to high-frequency periodic excitation due to engine combustion events. This excitation is propagated from the engine through the crank pulley and the belt to the accessory pulleys and may cause unwanted system behavior, to include 1) excessive creep or gross slip of the belt on one or more pulleys, 2) large belt-span transverse vibrations, 3) and/or large belt-span tension variations. In turn, the excitation may be responsible for premature degradation and failure of the belt or other components of the belt-drive. In this paper, an explicit time integration finite element code is used to study the effect of harmonic excitation on the belt-drive operation of a prototypical two-pulley belt-drive. The change in the slip zone extent over a half period increases as the crankshaft RPM fluctuations increases. The magnitude of the driven pulley angular velocity oscillations decreases nonlinearly with increasing crankshaft excitation frequency.