基于ABAQUS的振动筛大梁裂纹有限元分析  

ABAQUS-based finite element analysis of cracking failure of the girder of vibrating screen

作　　者：沈宁 李昌 窦东阳[2] SHEN Ning;LI Chang;DOU Dongyang(Coal preparation Center,Ningxia Coal Industry Co.Ltd.,Yinchuan 751400,China;School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]宁夏煤业有限责任公司洗选中心,宁夏银川751400 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《选煤技术》2024年第2期22-28,共7页Coal Preparation Technology

基　　金：国家重点研发计划(2021YFC2902602)。

摘　　要：为研究振动筛大梁正常工况与产生裂纹后的振动状态的差别,以AHS3661型振动筛大梁为研究对象,对其进行了有限元的模态分析和受迫振动分析。结果表明:在无裂纹情况下大梁受迫振动的模拟最大应力为89MPa,最大位移接近10mm,与现场实测情况相符,验证了有限元分析的有效性;大梁近激振器处存在5mm未贯穿钢板裂纹时,大梁受迫振动最大位移达到19.5mm,最大应力位于裂纹处,数值为201MPa;大梁近激振器处存在10mm贯穿钢板裂纹时,大梁受迫振动最大位移达到93.4mm,最大应力升高至577MPa;大梁中部存在5mm未贯穿钢板裂纹时,大梁最大振幅为18.3mm,最大应力位于裂纹处且数值达到291MPa;大梁中部存在10mm贯穿钢板裂纹时,大梁最大振幅为27.8mm,最大应力位于裂纹处,数值为482MPa;总体而言,大梁产生裂纹后,大梁的模态振型发生改变,固有频率上升,大梁的振动幅值出现增大,裂纹附近产生显著高于其他区域的应力。研究结果可作为现场实际故障诊断的理论参考,为振动筛预防维修提供一定依据。In order to investigate the change of vibrating state of vibrating screen's girder before and after ap-pearance of cracks on the girder,ABAQUS-based finite element analysis on modality and forced vibration state is made with the girder of the AHS3661 vibrating screen as the object study.Analysis shows that in the absence of cracks,the simulated maximum stress of forced vibration of the girder is 89 MPa with a maximum displace-ment approaching 10 mm,which are consistent with the actually measured values and testify the validity of the F-E analysis in this regard;with the appearance on the girder near the exciter of a 5 mm-deep crack without penet-rating through the steel plate,the displacement of the girder under forced vibration reaches 19.5 mm with the maximum stress appearing at the cracking point with a magnitude of 201 MPa;in the presence of a 10 mm crack near the exciter,which extents through the steel plate,the maximum displacement of the girder under forced vi-bration reaches 93.4 mm with the maximum stress going up to 577 MPa;in the case that a 5 mm crack appears in the middle section of the girder,the girder tends to vibrate with a maximum amplitude of 18.3 mm and a max-imum stress of 291 MPa at the cracking point;and at the time when there appears in the middle section of the girder a 10 mm crack which extends through the steel,the girder is seen to vibrate with a maximum amplitude of 27.8 mm,and a maximum stress of 482 MPa at the cracking point.Viewed as a whole,cracking of the girder would cause the girder to undergo changes in vibration mode and to vibrate with increased natural frequency and amplitude,causing as a result the stress near the cracking point to be noticeably higher than those in other areas.The work in the paper may serve as a theoretical basis for making fault diagnosis on site and adoption of preventivemaintenancemeasures.

关 键 词：直线振动筛 大梁裂纹 有限元分析 仿真模拟 最大应力 故障诊断 

分 类 号：TD452[矿业工程—矿山机电]