针对刮板输送机刮板链立环疲劳试验成本高、周期长的不足,利用多体动力学软件建立链传动系统的刚-柔耦合动力学模型。首先对典型工况进行仿真计算,得到立环在各仿真时刻的应力云图,并确定危险点;其次提取危险点的载荷应力时间历程,根据刮板输送机的任务剖面进行载荷处理,得到能够直接进行寿命计算的载荷谱;最后根据线性疲劳损伤累积法则进行立环危险点疲劳寿命计算,得到立环在任务剖面下的循环次数。利用虚拟样机技术进行立环疲劳寿命预测的方法,不仅可以减少疲劳试验成本,也可为将来进行整机的疲劳试验提供技术基础。

According to the high cost and long period of the fatigue test for the vertical ring of the scraper chains in the scraper conveyor, the multimedia dynamics software was applied to establish a rigid-flexible coupling dynamics model of the chain riving system.A similar calculation was firstly conducted on the typical performan ces, the stress cloud diagram of each simulation time for the vertical ring was obtained and the dangerous point was determined.Then the load stress time history of the dangerous point was picked up.According to the mission cross section of the scraper conveyor, a load process could be conducted and the load spectrum of the service life calculation could be obtained.Finally according to the linear fatigue failure accumulation law, the fatigue service life of the vertical ring dangerous point could be cal culated and the circulated numbers under the mission cross section of the vertical ring were obtained.The virtual prototype technology could be applied to the prediction of the fatigue service life of the chain ring, thus could reduce the fatigue test cost and could provide the technical base for the fatigue test of the whole machine in the n ear future.