Nonlinear Analysis And Optimization Research On The All-terrain Crane Luffing Jib Combination System

All-terrain crane luffing jib system has two cases, one is the combination of luffing jib, main jib and its extended section, the other is the combination of main jib, its extended section, luffing jib and the super-lift system. The two states of jib can achieve the maximum lifting height and the maximum amplitude when it is in hoisting operation. In order to execute accurate design for jib system, the paper has carried out mechanical performance analysis and optimization design research for all-terrain crane luffing jib system.First of all, two kinds of combination type of all-terrain crane luffing jib request the reasonable simplification, the finite element model of all-terrain crane luffing jib combination system is established by using the ANSYS software and it is anlyzed at the same time.On this basis, the finite element method and the corresponding software ANSYS analysis are combined is to execute linear analysis and geometric nonlinear analysis respectively for two kinds of complex jib system on the all-terrain crane luffing jib. And select a typical main jib, the main jib extended section, luffing jib boom condition, a kind of main arm, the main jib extended section, luffing jib, super device boom condition, the linear analysis and geometric nonlinear analysis are respectively executed. At the same time the same load conditions are applied and the calculation results of linear analysis and geometric nonlinear analysis are compared. Hence, when analysis large deformation problems, a geometric nonlinear analysis which is used is effectively to avoid calculation errors caused by linear analysis, thus high precision of calculation results can been got. At the same time under the same load conditions, the geometric nonlinear analysis for all-terrain crane luffing jib system without the super-lift system and all-terrain crane luffing jib system with the super-lift system are respectively executed, and the analysis results are compared. It is concluded that under the same conditions, the super-lift system which is added on the all-terrain crane luffing jib system can increase the bearing capacity and improving the load conditions of jib.In addition, the self-weight of all-terrain crane jib structure occupies a large proportion in the whole weight, and it can be restrained by the whole machine overturning stability. It is necessary to execute lightweight research for jib, so that the all-terrain crane can achive higher lifting height and larger amplitude during the operation. Based on particle swarm optimization algorithm, a mathematical model for a middle sections of jib is established, optimization procedure and process is written, optimization analysis for the truss structure size using MATLAB is executed and the jib frame size reasonably is got, that is it is lightweight.This paper studies that the super-lift device has the beneficial effects on all-terrain crane luffing jib combination system, and it has certain reference value for engineering design of the all-terrain crane jib system.