Method for calculating dynamic characteristics of variable-stiffness asymmetric damping tensioner gear train

Abstract

The invention discloses a method for calculating dynamic characteristics of a variable stiffness asymmetric damping tensioner gear train. The method comprises the following steps: establishing a four-wheel engine front end accessory driving system model; obtaining corresponding equivalent damping coefficients under different tensioner swing angles and swing speeds; establishing a motion equation of the tensioner; establishing a front-end gear train driven wheel motion equation based on the rotation motion equation; establishing a calculation equation of the belt tension under different stress conditions; establishing driving excitation of a driving wheel to obtain a front-end wheel train dynamic response calculation system model; and solving the front-end gear train dynamic response calculation system model to obtain a dynamic response result of the gear train. The variable stiffness characteristic of the tensioner can be embodied in the equivalent damping coefficient, and the asymmetric characteristic of the tensioner can be embodied in the mathematical model. An equivalent damping coefficient function changing along with the swing angle of the tensioner is introduced into dynamic response solution of the gear train, and research on calculation of the variable-stiffness asymmetric damping tensioner gear train is filled.

Description

technical field [0001] The invention relates to the field of dynamic response of an engine front-end accessory transmission system, in particular to a calculation method for the dynamic characteristics of a variable stiffness asymmetrical damping tensioner gear train. Background technique [0002] The engine front end accessory drive system (EFEADS) is mainly composed of drive pulley, water pump pulley, air conditioner compressor pulley and multiple idler pulleys. With the increase of electrical equipment and the improvement of engine efficiency, the layout of EFEADS becomes more and more complex, and the NVH requirements become more and more stringent. Therefore, the automatic tensioner is widely used in EFEADS to keep the tension of the V-ribbed belt constant, where the symmetrical damping tensioner has the same damping torque at the same position during loading and unloading; the asymmetrical damping tensioner is in the same The damping torque in the loading direction is...

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Problems solved by technology

[0004] Xie Youlu, Liu Tong et al mentioned in the paper "Analysis and Optimization of Engine Front-end Gear Train Based on Simdrive" that the simdrive commercial software is used to analyze and optimize the engine front-end gear train, but this commercial software can only be used for symmetrical damping tensioners Simulation analysis of some specific asymmetric damping tensioners

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