PERIODIC RESPONSE OF FRONT END ACCESSORY DRIVES WITH DRY FRICTION

摘要

Belt drives have long been utilized in engine applications topower accessories such as alternators, pumps, compressors andfans. Drives employing a single, at, `serpentine belt' tensionedby an `automatic tensioner' are now common in automotive en-gine applications. The automatic tensioner helps maintain con-stant belt tension and to dissipate unwanted belt drive vibrationthrough dry friction.The objective of this study is to predict the periodic rota-tional response of the entire drive to harmonic excitation fromthe crankshaft. To this end, a multi-degree of freedom incremen-tal harmonic balance (IHB) method is utilized to compute peri-odic solutions to the nonlinear equations of motion over a widerange of engine speeds. Computed results illustrate primary andsecondary resonances of accessories and tensioner stick-slip mo-tions.