具有单向离合器的多楔带附件驱动系统旋转振动建模及参数优化设计

建立有单向离合器装置的三轮-多楔带附件驱动系统的非线性旋转振动数学模型。用Gear数值算法求解从动轮与张紧臂的角度波动。计算结果表明,有单向离合器装置时从动轮与张紧臂的角度波动、各带段的动态张力、带-轮间的滑移率等系统动态特性均明显减小。计算、研究单向离合器弹簧刚度的大小、附件轴与从动轮转动惯量比的大小对系统动态特性的影响。以张紧臂角度波动、单向离合器弹簧扭矩、带-从动轮间的滑移率最小为优化目标,建立单向离合器弹簧刚度和附件轴转动惯量两参数优化设计数学模型。结果表明,优化后的系统参数,三轮-多楔带传动系统的动态特性均得到一定程度的改善。文中单向离合器装置三轮-多楔带传动系统的建模、动态特性求解及参数优化设计方法,为发动机前端附件驱动系统的旋转振动控制提供参考。

Rotational vibration modeling and optimization design of serpentine belt accessory drive system with one-way clutch

A mathematical model for nonlinear rotational vibration analysis of a three pulley-serpentine belt accessory drive system(SBADs) with a one-way clutch was established.Gear’s method was used to calculate the angle fluctuations of driven pulleys and tensioner arm.Calculation results show that,the dynamic indices of the SBADs,including angle fluctuations of driven pulleys and tensioner arm,tension of each belt span,and slip rate between belt and pulley decrease significantly as compared with those in the case of without the one-way clutch.Then,the dynamic properties of the SBADs were investigated under different spring stiffness of the one-way clutch,and different inertia ratio of the accessory shaft and driven pulley.Moreover,an optimization design model with the spring stiffness of the one-way clutch,and the inertia of the accessory shaft as two optimizing variables was established.In the optimization model,the minima of the angle fluctuation of tensioner arm,the spring torque of one-way clutch,and the slip ratio between belt and driven pulley were taken as objective functions.The optimization results were obtained by using fminimax function in the matlab software.The analytical results show that the dynamic responses of the SBADs decrease significantly when using the optimization parameters.The methods of modeling,calculation and optimization design are instructive for the vibration control of an engine front end accessory drive(FEAD) system with one-way clutch.