水泥立磨系统激励仿真及振动疲劳寿命预测

发布时间：2018-05-04 13:24

本文选题：水泥立磨 + 离散元　；参考：《机械设计》2017年06期

【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。
[Abstract]:Vertical cement mill is a kind of high-efficiency grinding equipment, which is easy to produce vibration fatigue damage. Aiming at a cement vertical mill, the particle model of cement clinker is established by using PFC3D discrete element software to simulate the crushing process of cement clinker, and the dynamic force curve of grinding roller is obtained by simulation. The acceleration and power spectrum density of grinding roller are calculated by MATLAB, and the excitation simulation analysis is completed. The acceleration signal and the power spectral density curve of the measuring point are obtained to compare the simulation results with the field vibration test. The random vibration analysis of cement vertical mill system is carried out by using the simulation power spectrum density as input by using Workbench software, and the stress cloud diagram is obtained, and the vibration fatigue life of cement vertical mill system is estimated by Steinberg three-interval method. The results show that the simulated power spectrum density is close to the measured results, and the weakness of the vertical mill system is located at the lower edge of the vertical arm hole, and the estimated vibration fatigue life is 10.56 a. The simulation of cement vertical mill system and the prediction of vibration fatigue life provide the basis for the excitation solution and structural design and optimization of vertical mill.
【作者单位】：燕山大学机械工程学院;
【基金】：国家自然科学基金资助项目(51505417)
【分类号】：TQ172.632.5

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