Browse Publications Technical Papers 2019-01-1546

Modeling and Validation for the Hysteretic Behavior of an Automatic Belt Tensioner 2019-01-1546

An automatic tensioner used in an engine front end accessory drive system (EFEADS) is taken as a study example in this paper. The output torque of the tensioner, which consists of the spring torque caused by a torsional spring, the damping torque caused by damping parts, and the frictional torques caused by a bushing and a rotational arm of tensioner, 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 output 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 parts is investigated based on the simulation and a durability test of the tensioner. A finite element method for the tensioner without damping part is established. Then the radial deformation for the torsional spring under an unconstrained state is analyzed. The analysis results have a good correlation with the measurements. The method presented in this paper is beneficial for predicting the working torque performance of an automatic tensioner, and reducing the design period and the cost for prototype validation.


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