起重机铸造箱型主梁拓扑优化

Topology Optimization of the Box-type Girder Forladle Crane

为了减轻起重机金属结构的质量、降低成本,针对连续性材料,将整体的边界条件转化为微结构单胞的边界条件,建立微结构单胞的有限元模型,采用变密度方法和优化准则法结合来求解拓扑优化问题,同时得出1种新型的主梁腹板结构,这种结构为几何不变结构,与桁架式腹板结构比较,制造工艺简单,切合工程实际。将这种拓扑优化方法和新型腹板结构应用于铸造起重机中并通过分析得出,该新型主梁腹板结构能满足铸造起重机主梁结构的强度、静刚度和疲劳强度,并且大大减轻了主梁自重,节省了制造成本。

In order to reduce the quality and reduce the cost of crane metal structure,aiming at the continuity of the material, the whole boundary conditions into the boundary conditions of microstructure cell, finite element microstructure cell model proposed by alterable density method and optimization criteria method to solve the optimization problem of topology,and obtain a new type of main girder the web structure,this structure is geometrically stable structure,compared with the truss web structure,simple manufacturing process,practical engineering. The topology optimization method and the new web structure are applied to the ladle crane,the new model girder web structure can meet the casting crane girder structure strength,stiffness and fatigue strength,and greatly reduces the weight of the main girder,saves the manufacturing cost.