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Analysis of the Dynamic Performance of an Engine Front-End Accessory Drive System with an Asymmetric Damping Tensioner

Ningbo Fengmao Far-East Rubber Co., Ltd.-Weijun Zhao
South China University of Technology-Bo Zhou, Wen-Bin Shangguan, Shangbin Long, Yi Sun
  • Technical Paper
  • 2020-01-0409
To be published on 2020-04-14 by SAE International in United States
The automatic tensioner is an important component of the engine front-end accessory drive system (EFEADS),It maintains the tension of the belt steadily and reduces the slip of pulley, which is benefit for improving the life of V-ribbed belt. In this paper, an EFEADS model is established which is considering with the hysteresis characteristics and the asymmetry of friction damping of a tensioner. An EFEADS is taken as a study subject. The dynamic responses of system, such as the oscillation angle of each pulley, the slip factor of pulley, the oscillation of tensioner arm and the dynamic belt tension are analyzed with symmetric damping and asymmetric damping tensioner. Meanwhile, the influence law of asymmetric damping factors of tensioner on the dynamic response of EFEADS is also investigated. The experimental results show that tensioner with an asymmetric damping can effectively reduce the oscillation angle of each pulley and the oscillation of tensioner arm, and the fluctuation of dynamic belt tension.
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Analysis for Dynamic Performances of Engine Front End Accessory Drive System under Accelerating Condition

Ningbo Fengmao Far-East Rubber Co.,Ltd-Weijun Zhao
South China University of Technology-Chujian Lin, Shangbin Long, Yi Sun, Wen-Bin Shangguan
  • Technical Paper
  • 2020-01-0399
To be published on 2020-04-14 by SAE International in United States
A model for a generic layout of an engine front end accessory drive system was established. The dynamic performance of the system were obtained via a numerical method. The dynamic performance consisted of the oscillation angle of tensioner arm, the slip ratio of each pulley and the dynamic belt tension. In modeling the system, the hysteretic behavior of an automatic tensioner, the loaded torque of the accessory pulley versus the engine speed, the torsional vibration of crankshaft and the creep of the belt were considered. The dynamic performance of the system at steady state and under accelerating condition were analyzed. An example was provided to validate the established models. The result shows that the torsional vibration of crankshaft is larger under accelerating conditions and the dynamic performance of the system is different, though the acceleration is small. In the end, the dynamic performance of the system using different belt with different Young’s modulus is studied by using the established model.
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Modeling and Analysis of Front End Accessory Drive System with Overrunning Alternator Decoupler

Ningbo Fengmao Far-East Rubber Co.,Ltd-Weijun Zhao
South China University of Technology-Zhonghui Yin, Shangbin Long, Yi Sun, Wen-Bin Shangguan
  • Technical Paper
  • 2020-01-0398
To be published on 2020-04-14 by SAE International in United States
The generator is an important loaded component of a Front End Accessory Drive system (FEADS). With a huge moment of inertia and a very high running speed, the vibration and noise often occurs in operation, which has an effect on the service life. Thus an overrunning alternator decoupler (OAD) is used in the FEADS for reducing the vibration. In this paper, a model of FEADS with an OAD is established by the software Recurdyn. The influence of the OAD on the dynamic responses of pulley of generator and the system are analyzed, and is verified by bench experiments. And the influence of parameters, such as spring stiffness, moment of inertia of generator and loaded torque on the dynamic performances of the system are studied. Then an effective method is presented to optimize the oscillation of the tensioner arm and the slip ratio of the belt-generator pulley.
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Modeling and Validation for the Hysteretic Behavior of an Automatic Belt Tensioner

BYD Auto Industry Company Limited-Pu Xu
South China University of Technology-Shangbin Long, Xuezhi Zhao, Wen-Bin Shangguan
Published 2019-06-05 by SAE International in United States
An automatic tensioner used in an engine front end accessory drive system (EFEADS) is taken as a study example in this paper. The working torque of the tensioner, which consists of the spring torque caused by a torsional spring and the frictional torques caused by the contact pairs, is analyzed by a mathematic analysis method and a finite element method. And the calculation and simulation are validated by a torque measurement versus angular displacement of a tensioner arm. The working torques of the tensioner under a loading and an unloading process are described by a bilinear hysteretic model, and are written as a function with a damping ratio. The rule of the action for the damping devices is investigated based on the simulation and a durability test of the tensioner. A finite element method for the tensioner without damping device is established. Then the radial deformation for the torsional spring under an unconstrained state is obtained. The analysis results have a good correlation with the measurements. The method presented in this paper is beneficial for…
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