A fatigue damage model is developed for evaluating accumulative fatigue damage of dumpers. The loading spectrums acted on dumpers are created according to measured strain data in field. The finite element analysis is ...A fatigue damage model is developed for evaluating accumulative fatigue damage of dumpers. The loading spectrums acted on dumpers are created according to measured strain data in field. The finite element analysis is carried out for assessing stress distribution and strength characteristics of dumpers. Fatigue damage indexes and service life are calculated by a modified Palmgren-Miner rule. The investigation shows that fatigue notch factor has a significant influence on the calculation of fatigue damage of dumpers.展开更多
据列车纵向动力学理论建立拨车机动态仿真模型,考虑缓冲器强非线性特性、车钩间隙效应、车辆启动及运行阻力等因素开发出拨车机动态载荷仿真系统。通过列车拨车试验数据验证模型的有效性,据出口拨车机系统初始设计速度曲线预测4万吨列...据列车纵向动力学理论建立拨车机动态仿真模型,考虑缓冲器强非线性特性、车钩间隙效应、车辆启动及运行阻力等因素开发出拨车机动态载荷仿真系统。通过列车拨车试验数据验证模型的有效性,据出口拨车机系统初始设计速度曲线预测4万吨列车拨车载荷。结果表明,初始设计速度下拨车机最大载荷为1 414.9 k N。通过对4万吨列车速度曲线的优选保证拨车效率及每次拨车距离,拨车机载荷较原方案下降30%,时间缩短5 s。该动态仿真系统可为重载列车拨车机设计提供新手段。展开更多
文摘A fatigue damage model is developed for evaluating accumulative fatigue damage of dumpers. The loading spectrums acted on dumpers are created according to measured strain data in field. The finite element analysis is carried out for assessing stress distribution and strength characteristics of dumpers. Fatigue damage indexes and service life are calculated by a modified Palmgren-Miner rule. The investigation shows that fatigue notch factor has a significant influence on the calculation of fatigue damage of dumpers.
文摘据列车纵向动力学理论建立拨车机动态仿真模型,考虑缓冲器强非线性特性、车钩间隙效应、车辆启动及运行阻力等因素开发出拨车机动态载荷仿真系统。通过列车拨车试验数据验证模型的有效性,据出口拨车机系统初始设计速度曲线预测4万吨列车拨车载荷。结果表明,初始设计速度下拨车机最大载荷为1 414.9 k N。通过对4万吨列车速度曲线的优选保证拨车效率及每次拨车距离,拨车机载荷较原方案下降30%,时间缩短5 s。该动态仿真系统可为重载列车拨车机设计提供新手段。
