Experimental Investigation on Dynamic Characteristics of a FEAD System: Affected by Serpentine Belt Length

Abstract

Serpentine belt is widely used in the front end accessory drive (FEAD) system of automotive engine. Experimental setup and dynamic behaviors of a FEAD system are demonstrated in this paper. Some dynamic characteristics are investigated, subjected to multifrequency excitations and different crankshaft (CRK) loads. Experimental results show that the parametric instability of belt transverse vibration occurs mainly in the frequency regions of secondary resonance, and the instability regions are shifted to lower frequencies according to the increasing of CRK speed. With the same CRK load and speed, the rotational angle of tensioner arm, the hubload of tensioner pulley and the slip rate of ALT pulley in the short-belt system are smaller than that in the long-belt system. But with the increase of CRK loads, the parametric instability of belt transverse vibration in the short-belt system is stronger than that in the long-belt system, the higher CRK speed, the greater belt transverse displacement.

Modelling of the rotational vibrations of the engine front-end accessory drive system: a generic method

“…To make it more practical, Sandhu et al 3, 9 simplified the model and solved it by computer-aided engineering and a modular integration technique. Furthermore, Zeng and Shangguan, 10, 11 Wang et al 12 and Xu and Antchak 13 studied the features of the dynamic response characteristics of EFEAD systems, such as the influences of the total length and the damping of the serpentine belt and the overrunning alternator decoupler.…”