A method for modelling non-linear rotational vibration of an engine front end accessory drive (FEAD) system is established. The FEAD consists of eight pulleys, a belt and an overrunning alternator decoupler (OAD) between the alternator pulley and the alternator rotor. Gear's method is used for calculating the rotational vibrations for driven pulleys and tensioner arm. Simulation results indicate that rotational vibrations of driven pulleys and tensioner arm, tension of each belt span, and slip ratio between belt and pulley decrease when the FEAD is equipped with an OAD. The influences of the stiffness of OAD spring, the moment of inertia ratio for alternator rotor and alternator pulley, and the torque applied to alternator rotor on the dynamic properties of the FEAD are investigated. Moreover, an optimisation model for selecting OAD design parameters to minimise rotational vibration of tensioner arm, slip ratio between belt and a pulley is proposed. The optimised result validates the presented optimisation method.Reference to this paper should be made as follows: Zeng, X-k. and Shangguan, W-B. (2012) 'Modelling and optimisation dynamic performances for an engine front end accessory drive system with overrunning alternator decoupler', Int.
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.
A viscous fan clutch with double grooves is taken as a studying example for measuring its slip and surface temperatures. The grooves between driving and driven plate of the viscous clutch are filled with silicone-oil in this study. Experimental methods and test rig to measure the slip and surface temperatures for a viscous clutch are discussed. The relations of the clutch slip and clutch surface temperatures with the change of the input speed are measured.
Tensioners play a predominant role in the dynamic behavior of serpentine belt drive systems. The experimental set-up was carried out to study the dynamic characteristics of tensioner. Experimental results illustrate that tensioner shows hysteresis nonlinear dynamic characteristics, and dynamic stiffness and damping of slip motion of up stroke of tensioner are related to excitation frequency and amplitude. The first differential nonlinear model of tensioner was determined, and the parameter identification method of the model was introduced. The accurate of the nonlinear model and effectiveness of the parameter identification method was validated.
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