Based On The Real Mode Of Operation Of All-terrain Crane Loading Boom System Analysis

The property of all-terrain crane boom is one of the important standards todetermine the performance of whole machine, and precise design andcalculation is prerequisite for improving the property of all-terrain crane boom.Unreasonable structure, overweight or lack of material affects the property ofboom and whole machine. For precisely calculate to boom, in this paper, theresearch of boom system is following:At first, analysis parameterized finite element modeling of all-terrain craneboom based on the adjustment of design parameters of boom, which rationalizethe structure. Respectively analysis eigenvalue stability, elastic-plastic stabilityand stability based on edge fiber yield theory using finite element method.Giving a detailed analysis of the process, and through a comparative analysis ofthree kinds of critical load calculation method, concluded that result ofeigenvalue stability analysis critical load relatively large, although based onedge fiber yield analysis calculation process is simple but critical load is toosmall, the result of elastic-plastic stability is most approximate, which suitablefor large deformation of the engineering problem.And then, specific to the problem that the force caused by rope close to theboom deformation changes during the loaded process of it, proposing loadingmethod for solving the force of rope and jib which applied its deformed shapeand size of rope tension. Application of this loading method, using nonlinearanalysis method analyze telescopic boom in three kinds of different length andfour kinds of different elevation, getting the maximum equivalent stress,maximum displacement, the results of critical load of telescopic boomrespectively, and compared the results with that does not consider the effect ofthe rope force on the telescopic boom. The results show that without consideringthe situation that the force and its change of rope contact with telescopic boom,as the increase of elevation or boom length, the relative error of the maximum equivalent stress, maximum displacement, critical load of telescopic boomincreases, relatives to the situation considering the contact force with rope andtelescopic boom, the deviation more than10%at the situation of meddle or longboom and when the elevation of60o.At last, proposing two methods including that using pre-deflection angle andadjusting derricking cylinder to reduce initial deflection in the process of liftinggoods of all-terrain crane, and analyze the process of lifting goods using thesetwo methods, respectively getting the working data of the deformation process,corresponding critical load, horizontal force of the boom, deviating variation ofposition and the slip range caused by goods.From the analyze of illustration, the proposed nonlinear analyze methodwhich based on approaching on the actual load of the system of all-terrain cranecan improve the design precision of the boom, thus make design morereasonable and make operation more secure and reliable.