【摘要】 针对柴油发电机组传动系统中分段刚度弹簧-阻尼联轴器异常碰撞故障，建立了考虑联轴器碰撞的传动系统动力学模型，基于模型研究其故障机理和诊断方法，提出了消除故障的方案．首先，分析了机组起动过程中实测传动系统的扭振信号频率特征，结合传动系统自由振动计算所得扭振模态特性，确认机组起动过程中通过临界转速时联轴器主、被动端发生了碰撞．之后，进一步研究了联轴器主、被动端产生碰撞时联轴器关键件(中间盘)受力情况，计算得到该联轴器中间盘最大应力达到325 MPa，超过了中间盘材料的疲劳极限(225 MPa)，导致联轴器中间盘断裂．然后，建立了考虑联轴器碰撞的传动系统动力学模型，研究了柴油发电机组起动过程联轴器异常碰撞故障机理，分析了刚度、阻尼等影响因素，提出了替换原联轴器的方案并进行了试验验证，最终解决了联轴器异常碰撞故障问题．更多还原

【Abstract】 In order to investigate the abnormal collision fault of piecewise stiffness spring-damper coupling in the transmission system of a diesel generator set during the startup,a dynamic model of the transmission system considering coupling collision was established. Based on the model,the fault mechanism and diagnosis method were studied,and the scheme to eliminate the fault was proposed. First,the frequency characteristics of measured torsional vibration signals of the transmission system during the startup of the unit were analyzed. Combined with the torsional vibration modal characteristics calculated by the free vibration of the transmission system,it was confirmed that the collision occured between the driving and driven ends of the coupling when the unit passes the critical speed during the startup. Next,the stress of the key part(intermediate plate) of the coupling during the collision between the driving end and the driven end of the coupling was further studied. It is found that the maximum stress of the intermediate plate of the coupling reaches 325 MPa,which exceeds the fatigue limit of 225 MPa for the intermediate plate material,resulting in the fracture of the intermediate plate of the coupling. Then,a dynamic model of the transmission system considering coupling collision was established,the mechanism of abnormal coupling collision fault during the startup of the diesel generator set was studied,and the influencing factors such as stiffness and damping were analyzed. Finally,a scheme of replacing the original coupling was proposed and verified by experiments,and the problem of abnormal collision fault of coupling was solved.更多还原