Research of deflection - payload dependence of the auto crane articulated boom

Abstract

One of requirements to be fulfilled by supporting structure is condition of deformation. Usually, it is set through displacement limits of certain points on deformed structure. The paper presents a method for determining the deflection of auto crane articulated boom due its payload on the example of three-segment articulated structure. The forces in joints were obtained in the segments' local coordinate systems. The equations of bending moments for each segment were defined, with respect to angles of segment inclination. Based on strain energy and Castigliano's second theorem, component displacements of the boom's tip were calculated in the global coordinate system XYZ. Finite element method (FEM) revealed that deviations of the analytical model are less than 5% for different boom shapes within work range.