Structural Topology Optimization of Cantilever Crane Boom Based on Equivalent Moving Load Method

Abstract

As a key structure in the process of lifting heavy objects by cantilever cranes, the boom is of great significance. When the cantilever crane carries heavy objects, the load on the boom is a typical moving load. The traditional structural optimization method cannot fully consider the influence of the moving load on the structure. Based on the variable density structure topology optimization method, the equivalent moving load method is proposed to transform the motion of heavy objects on the boom into multiple equivalent working conditions. And according to the structural characteristics and motion form of the boom, the weight coefficient of every equivalent working conditions is assigned. The number of equivalent moving loads is determined in the form of multiple growth, and finally the lightweight cantilever crane boom structure is obtained, which is 32.08% lighter than the original structure, thus verifying the structural topology based on the equivalent moving load method proposed in this paper. The feasibility and effectiveness of the optimization method are also provided for other structural optimization that are subject to moving loads.