Weight reduction is frequently concerned for general structure design as it can save energy in the life cycle of a machine.A small self-propelled multi-functional working machine for orchard use was designed.The lifting platform of the machine is analyzed using the finite element method for the purpose of structure optimization.By carrying out the finite element analysis,the inner stress for each component that forms the lifting platform was discussed under the designed maximum working load.Based on the relationship between the calculated von Mises stress in the structure and the yield strength of the material,the static strength of the component was verified and structure optimization suggestion was given.According to the FEA result,the overall structure of the lifting platform designed on the basis of theoretical calculation is statically safe,except for one of the long shaft sleeve.The dimension for most of the parts should be reduced since these components had an abundant static strength.
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