抓斗起重机主梁动特性有限元分析

Main Girder Finite Element Analysis of Dynamic Characteristics of Grab Crane

建立抓斗起重机在起升过程中的振动微分方程组,利用有限元分析软件ANSYS的瞬态动力学分析模块对抓斗起重机小车位于主梁跨中、吊重突然离地这一过程进行动态特性分析,得出主梁在起升冲击载荷作用下,跨中节点的位移时间历程响应以及在该过程中主梁产生的最大动应力,为抓斗起重机动载荷的修正提供了理论基础及仿真数据。

Vibration differential equations are established in the lifting process of the grab crane, using transient dynamic analysis module of the finite element analysis software ANSYS to analyse the process of the crane trolley which located in the main girder, suddenly lifting off the ground in dynamic characteristics. It is obtained that under the effect of lifting impact loading, the displacement time progress of the main girder＇s mid span-node and the maximum dynamic stress of the main girder generating in this process, which provides theoretical basis and simulation data for the amendment of grab crane load.