摘要
精梳机的墙板具有尺寸大、结构复杂的特点,存在严重的动应力集中问题,而直接对其进行最优化设计又存在很大的困难。因此针对墙板的结构特点和受载条件,建立了相应的简化分析模型。模型分单矩形孔模型和双矩形孔模型。单矩形孔模型用于分析孔洞的几何形状与孔边最大动应力的变化规律,包括边长比、孔角半径;双矩形孔模型用于分析孔之间的相对位置与孔边最大动应力的变化关系。根据得出的规律对精梳机墙板的结构进行了改进,结果显示墙板的应力峰值减小为原来的三分之一。由此验证了该简化模型是合理的,由该模型得出的结论可以帮助我们进一步认识矩形孔夹杂对结构应力分布的影响规律,从而为矩形孔结构的设计与优化提供了参考。
It is difficult to optimize the wallboard of a comber because of its large dimension, complicated rebar and many holes with different geometrical shapes. In this paper, two simple models of the wallboard is proposed to solve the problem. Models have one or two rectangular holes and can be implemented easily. The models are extracted in terms of boundary conditions, loads and stress distribution of wallboard which is obtained by finite element analysis （FEA）. Then, subproblem approximation method and first order optimization method are combined to study the effect of parameters on dynamic stress distribution of the models, such as length, width and distance between two holes. Analysis results are validated by application to the wallboard whose highest stress reduces by 2/3. The two models can be used to study other structures with rectangular holes under bending of uniform loading.
出处
《机械科学与技术》
CSCD
北大核心
2008年第9期1207-1210,1216,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
江苏省科技成果转化项目(BA2004035)资助
关键词
动应力集中
优化
精梳机
墙板
模型
dynamic stress concentration
optimization
comber
wallboard
