Investigation Of Box-type Telescopic Boom Local Stability And Stiffness

As social and economic development, more and more large-scale constructionhave made more stringent requirements against crane lifting weight,wheeledcranes, because of its excellent mobility and applicability,have been used in avariety of operating environments.For a long time，the calculation and verificationof the local stability of the telescopic arm are on the premise that constraintsbetween each plates of telescopic arm is hingedwhat ignor the role of the elasticconstraints between each.Although that bring the convenience of calculating Eulercritical force,that sacrific excellent mechanical properties of the material,at thesame time,for security reason.Until now,researchsto local stability of the telescopicboom are focusing on optimizationwith the finite element analysis software in ourcountry,and the theoretical study of local stability is far from perfect,not tomentionrelated research resultsw taht can be applied directly todesign and guideprojects.This article will focus on the study and exploration of local stabilitywheeled telescopic crane preliminary,to make little useful contribution to thedevelopment of China’s construction machinery.Stability calculation methods and formulas plates under asymmetric boundaryof based on rectangular plate blending equation has been proposed. By select theappropriate boundary conditions; get instability characteristic equation of therectangular plate under asymmetric boundary and introduced dimensionlessconstraints coefficients to describe the role of elastic restraint telescopic lapbetween the plates quantitatively. Further, analyze the impact of constraintscoefficient on local stability telescopic boom. The results shows if elasticsupporting role are taken into account, locally stability performance of telescopicboom has been significantly improved; Increase the thickness of the constraintplate and decrease its width anti-buckling capacity of the telescopic boom will beimproved significantly.New deflection equation under symmetric and asymmetric elastic boundaryborders has been proposed. By introducing harmonic function, a uniformdeflection equation is obtained and you can quickly approaching a variety ofdeflection equations except under free boundary. Derived the formula ofrectangular plate to calculate Euler’s critical force, which withstand non-uniformforce, under symmetric and asymmetric elastic support conditions in the non-loadsides, by using the energy method and analyzed the influence of asymmetry of elastic boundaries on local stability of the telescopic.Study the effects of angles of lap plate for telescopic local stability. Bystudying the V-shaped flaps and fold plate buckling stiffness provided by eachother, deduced the corresponding buckling coefficient and then the results of thisstudy a are compared to simulation results. The research comes a good conclusionthat angle has no effect on the calculation method in this article within the normalrange.