发动机前端附件驱动系统旋转振动实测与计算方法

摘要

A mathematical model for rotational vibration analysis of a 8 pulley-belt serpentine belt drive system is established.In the model,creeping effect of belt on pulley wrap arc,viscous damping and dry friction of tensioner are considered.Excitation from crankshaft torsional vibration with multi-frequency components is used to analyze the dynamic response of engine frond end accessory drive system（FEAD）.Computational method for the steady-state tension in belt spans,natural frequency of a FEAD,rotational response of driven pulley and tensioner arm,dynamic tension of belt span,slip factor between pulley and belt are proposed.Good agreement is obtained between the estimated and tested rotational response of driven pulley and tensioner arm,and tension of each belt span.It is concluded that the dynamic tension of belt span,and slip factor between pulley and belt increase significantly when creeping of belt on pulley is ignored.%考虑各轮包角处带的蠕变、张紧器的阻尼和干摩擦转矩力及多谐波激励的作用,建立了八轮-带发动机前端附件驱动系统的旋转振动数学模型.给出了系统中皮带的静态和稳态张力、系统的固有频率、从动轮和张紧臂的角度波动、各带段的张力波动和带-轮间滑移因子的计算方法.多楔带传动系统的静态和动态特性的计算值与实测值吻合较好,验证了多楔带传动系统的建模方法、静态和动态特性的计算方法是正确的.计算结果表明,不考虑各轮包角处带的蠕变时,各带段的动态张力幅值和各个轮的滑移因子要比考虑带的蠕变时大.