发动机前端附件带传动系统动态特性研究

Research on Dynamic Characteristics of the Engine Front-end Accessory Drive System

考虑各附件轮时变负载、时变激励、多楔带纵向刚度、径向刚度和弯曲刚度的作用,利用Simdrive软件建立了内层和外层发动机前端附件带传动系统动力学分析模型;对系统的静态特性进行评估,采用Galerkin法进行系统空间离散,利用隐式多步法求解加速工况下系统的动态特性,得出附件轮转速波动、张力波动、带-轮间滑移特性的影响因素;根据分析结果,提出了适当增加初始张力、曲轴轮包角和惰轮2处添加自动张紧器的改进方案。对比分析得知,添加自动张紧器时,发动机前端附件带传动系统的动态特性得到了有效改善。

Considering the effects of time-varying load,time-varying excitation,longitudinal stiffness,radial stiffness and bending stiffness of each pulley,the dynamic analysis model of the inner and outer engine front-end accessory drive system is established by Simdrive software.The static characteristics of the system are evaluated.Galerkin method is used to discretize the system space,the implicit multi-step method is used to solve the dynamic characteristics of the system under acceleration conditions,and the influencing factors of the accessory pulley speed fluctuation,tension fluctuation and belt-pulley slip characteristics are obtained.Based on the analysis results,an improvement plan is proposed to appropriately increase the initial tension and the crankshaft wheel wrap angle,and add an automatic tensioner at the No.2 idler gear.The comparison analysis shows that the dynamic characteristics of the engine front-end accessory drive system are improved effectively when adding automatic tensioner.