弛张筛面大挠度非线性变形分析与实验  

Analysis and experiment on the large nonlinear deformation of a flip-flow screen

作　　者：彭利平[1] 刘初升[1] 董海林[1] 李珺[1] 夏云飞[2] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116 [2]浙江中烟工业有限责任公司,浙江杭州310000

出　　处：《煤炭学报》2014年第5期976-980,共5页Journal of China Coal Society

基　　金：高等学校博士学科点专项科研基金(博导类)资助项目(20120095110001);中央高校基本科研业务费资助项目(2013DXS03)

摘　　要：为研究高硬度弛张筛面挠曲运动过程中的大挠度非线性变形特性,考虑其受端部支承轴向压缩而失稳,建立了弛张筛面的细长压杆模型,引入换元积分,导出了筛面变形量随筛面长度的精确定量表达式,利用数值算法发现了筛板端部移动量应不大于0.271 5l(l为筛板长度);进行了筛面大挠度变形量的测试实验,发现变形筛面中心线两侧对称测点处的测量值十分接近,且筛面各测点处大挠度非线性变形的测量值和理论值的误差保持在7%以内,表明上述模型在表征筛面变形特性上的可行性。In order to study the large nonlinear deformation of the flip-flow screen plane （ LNDoFSP ）, considering the instability of the screen plane under the axial compression force,the dynamic model for a slender compressed bar was adopted. Then, the accurate quantitative assessment on the deformation along the axial length was derived through inte- gration by substitution,and based on which, a numerical algorithm was presented to find that the end of the screen plane should move less than 0. 271 5l,where l is the length of the screen plane. Finally, an experimental test was con- ducted and the results show that the experimental data of the test points mounted symmetrically on either side of the center line of the screen plane are almost the same. Additionally, the errors between the experimental and theoretical data are all less than 7% ,which demonstrates that the dynamic model is feasible to describe the LNDoFSP.

关 键 词：弛张筛面 大挠度变形 非线性变形 

分 类 号：TD452[矿业工程—矿山机电]