中文摘要：

水泥立磨是一种高效粉磨设备,其易产生振动疲劳破坏。针对某型水泥立磨,利用PFC3D离散元软件,建立水泥熟料的颗粒模型进行水泥熟料破碎过程的模拟,仿真得到磨辊的动态受力曲线;结合建立的磨辊部件的动力学模型,利用MATLAB计算磨辊的加速度及其功率谱密度,完成激励仿真分析。开展现场振动测试试验,获取测点的加速度信号和功率谱密度曲线以便对比仿真结果。利用Workbench软件,以仿真功率谱密度作为输入进行水泥立磨系统的随机振动分析,获取应力云图;结合Steinberg三区间法估计其振动疲劳寿命。结果显示仿真功率谱密度与测试结果相近;立磨系统薄弱点位于立臂孔下缘,估计振动疲劳寿命为10.56 a。水泥立磨系统激励仿真及振动疲劳寿命预测的研究为立磨的激励求解及结构设计和优化提供了依据。

英文摘要：

Cement vertical mill is a kind of grinding equipment with high efficiency,which is easy to occur vibration fatigue damage.For a certain type of cement vertical mill,the particle model of cement clinker is established and then the PFC3D discrete element software is used to simulate the fragmentation process of cement clinker to obtain the dynamic force curve of grinding roller.Combined with the dynamic model of the grinding roller assembly,the acceleration and power spectral density of the grinding roller are calculated by Matlab to complete the excitation simulation analysis.Field vibration test experiments are carried out to obtain acceleration signal and power spectral density curve of measuring point to compare with simulation results.Using the Workbench software,the random vibration analysis of the cement vertical mill system is completed,in which the simulated power spectral density as an input,and the stress nephogram is obtained.The vibration fatigue life is estimated by using the Steinberg three interval method.The results show that the simulated power spectral density is similar to the test results,the weak point of the vertical mill system is located in the lower edge of the vertical arm,and its vibration fatigue life is about 10.56 years.The study of excitation simulation and vibration fatigue life prediction provides a basis for excitation solution and structural design and optimization of the cement vertical mill system.