Lateral Stability Analysis Of Crawler Crane Boom

With the strengthening of infrastructural construction in China,the market demand for domestic large-tonnage crawler cranes has increased significantly,and the maximum rated lifting capacity of crawler cranes has been continuously refreshed.Due to the diverse combinations of crawler crane booms,the workload in the product design phase is huge.In order to ensure the development cycle and design quality,computer programs are often used for program design.In order to ensure the design efficiency,the calculation model of the boom system is mostly based on the linear theory.However,as the length of the boom is getting larger and larger,its lateral strength and stability have become the key factors which determine the performance of the crane boom.Nonlinear effect of lateral is not negligible.The nonlinear analysis of the finite element method is costly and time consuming,and is not suitable for embedding into the existing crawler crane development program.If the relationship between the linear model of the boom system and the structural stress of the nonlinear model would be carried out.It will help develop programs based on nonlinear effects,shortening design cycles and improving design quality.Taking the main boom of 350 t crawler crane as the research object,paper researche on the lateral stability of the crawler crane.The main research work of the paper is as follows:(1)Calculating the side load coefficient of the boom according to the national standard “Crane Design Specification”-GB/T 3811-2008,determine 3% of the rated load as the upper limit of the lateral load of the boom,selecting three side load coefficient for analysis,according to the original product boom’s hinge point support stiffness,three support stiffnesses are selected;(2)According to the 350 t crawler crane boom parameters,selecting four length booms and four tie-plate constraint coefficients,and establishing 16 kinds of boom ANSYS finite element models;(3)Through the four influencing factors: the length of the boom,the side load coefficient,the supporting stiffness and the constraint coefficient of the tie-plate,the 144 working conditions are selected and the lateral stability nonlinear analysis stress of the boom under the four influencing factors is calculated.Researching the influence of four influencing factors on the stress of the boom;(4)Calculating the lateral stability linear analysis stress of the boom under four influencing factors,and comparing it with the nonlinear analysis stress,calculating the stress ratio between nonlinear analysis and linear analysis,and researching the influence of four influencing factors on the stress ratio law;(5)Using MATLAB to perform multiple linear regression fitting on 144 sets of stress ratio data,deducting the algorithm of stress ratio under four influencing factors,selecting 60 m length boom,selecting three side loading coefficients,three supporting stiffness,two kinds There are 18 kinds of working conditions for the tie-plate constraint coefficient,and the fitting algorithm is verified to verify the correctness and feasibility of the algorithm.The lateral stability algorithm of the boom proposed in this paper is based on nonlinear theory,achieving the purpose of designing the boom quickly and accurately.