基于应变模态的振动筛上横梁疲劳损伤分析
发布时间：2018-07-18 16:59
【摘要】：基于模态理论建立了振动筛位移和应变模态参数识别模型,仿真分析了振动筛上横梁产生疲劳损伤裂纹时位移和应变模态参数的变化。分析结果表明上横梁产生疲劳裂纹后的模态频率和位移振型较疲劳损伤前均无显著变化,而应变模态振型在疲劳裂纹处发生了显著的突变,其中弯曲应变模态较扭转应变模态对疲劳损伤裂纹更敏感。以振动筛上横梁产生疲劳损伤裂纹前、后的应变模态变化率为指标判定疲劳损伤程度,由损伤程度即可确定上横梁疲劳裂纹尺寸,进而可由Paris公式的积分形式计算振动筛上横梁的疲劳剩余寿命。基于应变模态变化预测振动筛上横梁的疲劳损伤程度和疲劳剩余寿命,将有助于对其进行动态优化设计,从而提高振动筛的使用寿命。
[Abstract]:Based on modal theory, the identification model of displacement and strain modal parameters of vibrating screen is established, and the variation of displacement and strain modal parameters during fatigue damage crack in the upper beam of vibrating screen is simulated and analyzed. The results show that there is no significant change in modal frequency and displacement mode of the upper beam after fatigue crack, while the strain mode has a significant change at the fatigue crack. The bending strain mode is more sensitive to the fatigue damage crack than the torsional strain mode. The fatigue damage degree can be determined by the strain mode change rate before and after the fatigue damage crack in the upper beam of the vibrating screen, and the fatigue crack size of the upper beam can be determined by the damage degree. Furthermore, the fatigue residual life of the upper beam of vibrating screen can be calculated by the integral form of Paris formula. The prediction of fatigue damage degree and fatigue residual life of the beam on the vibrating screen based on the strain mode change will be helpful to the dynamic optimization design and thus the service life of the vibrating screen will be improved.
【作者单位】： 青岛科技大学机电工程学院;
【基金】：国家自然科学基金(51674149) 山东省自然科学基金(ZR2015EM035)资助~~
【分类号】：TH237.6
本文编号：2132557
[Abstract]:Based on modal theory, the identification model of displacement and strain modal parameters of vibrating screen is established, and the variation of displacement and strain modal parameters during fatigue damage crack in the upper beam of vibrating screen is simulated and analyzed. The results show that there is no significant change in modal frequency and displacement mode of the upper beam after fatigue crack, while the strain mode has a significant change at the fatigue crack. The bending strain mode is more sensitive to the fatigue damage crack than the torsional strain mode. The fatigue damage degree can be determined by the strain mode change rate before and after the fatigue damage crack in the upper beam of the vibrating screen, and the fatigue crack size of the upper beam can be determined by the damage degree. Furthermore, the fatigue residual life of the upper beam of vibrating screen can be calculated by the integral form of Paris formula. The prediction of fatigue damage degree and fatigue residual life of the beam on the vibrating screen based on the strain mode change will be helpful to the dynamic optimization design and thus the service life of the vibrating screen will be improved.
【作者单位】： 青岛科技大学机电工程学院;
【基金】：国家自然科学基金(51674149) 山东省自然科学基金(ZR2015EM035)资助~~
【分类号】：TH237.6
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