Nonlinear similar design of large slenderness ratio truss boom

Abstract

To solve the problem that lacks systematic product spectrum plan and serialization of design methods and theoretical basis in the design process of crawler crane boom, the main boom is as the research object in this paper. Force model is established in luffing plane and rotary plane by the load combination II when the lifting mechanism and the rotating mechanism simultaneously works. On the premise of each demand parameters of prototyping products being known, FEM basic equations are expressed in the form of potential function by introducing displacement potential function based on the local coordinate system. Unit similarity criterion is established in the local coordinate system by non-dimensional treatment for FEM basic equations are expressed in the form of displacement potential function. Nonlinear similarity criterion in the global coordinate system is obtained by using coordinate transformation method. The chord member cross-sectional area of design goals is designed by nonlinear similarity criterion and stability principle. The width and height of the boom is calculated based on rigidity principle. The layout of web member has been discussed. The angle between web member and chord member is designed as well as the length of web member.

Keywords

• crawler crane
• boom design
• nonlinearity
• similarity criterion