Finite Element Dynamics Analysis And Optimization Design Of Ground-Excited Ice-Roller

The compacted ice-snow formed by repeated rolling and trampling will bring serious traffic problems.There is an urgent need for equipment which can remove compacted ice-snow effectively.Ground-stimulated ice-roller has become a fascinating area both in the domestic and overseas for its labor-saving,efficiently,automatically and minimal road damage.At present,there is a lack of theoretical analysis of ground-excited ice-roller crushing compacted ice-snow,the factors affecting crushing compact ice-snow have not been clarified,and breaking compacted ice-snow effect of existing ice-roller still needs to improve.This article,taking P15 ground-excited ice-roller as the research object,cleared mechanism of the ice-roller breaking compacted ice-snow,analyzed the process of tool breakage on the compacted ice-snow,P15 ground-excited ice-roller crushing compacted ice-snow with finite element,by using of a ice-roller made by the company,and optimized factors,such as structure,arrangement of tools and the speed of the ice-roller,which affect the crushing compacted ice-snow effect,which provides methods,parameters and foundation for ice-roller design and manufacture and clearing its best velocity.The main research contents include:(1)Analysis of ground excited ice-roller structure and working principleThe structure of P15 ground-excited ice-roller was analyzed,its working principle was defined,the effect of the uneven surface of the compacted ice-snow on the ice-roller was analyzed,representation of compacted ice-snow surface was cleared.(2)Tool mechanics analysis and optimizationOn the basis of the characteristics and finite element material model of road compacted ice-snow and cutting tool force model were analyzed,according to ice-roller tool structure parameters introduced from Finland,the process of cutting tool breaking compacted ice-snow was analyzed using finite element method by ANSYS/LS-DYNA to optimize the tool shape and dimension parameters.(3)Finite element analysis of ground-excited ice-roller crushing compacted ice-snow processStructure and performance of asphalt pavement,rubber and bearing were analyzed at first,in which asphalt pavement surface was described using viscoelastic model,asphalt pavement bed course and base course were described using D-P model,rubber was described by inputting stress-strain curve,and bearing was simulated using spring element.Establishing the finite element parametric model of the process of P15 ground-excited ice-roller crushing compacted ice-snow by means of APDL language in ANSYS/LS-DYNA,generating and modifying K file,and solving it in LS-DYNA solver,the effect of ice-roller in crushing uneven compacted ice-snow,stress of asphalt and stress condition of important parts of ice-roller were analyzed.(4)Ground-excited ice-roller speed and tool arrangement optimizationBased on the finite element analysis of P15 ground-excited ice-roller compacting ice-snow,the cutter arrangement and the speed of the type of ice-roller were optimized.With the objective of the optimization set as compacted ice-snow areas broken and the limiting condition set as that the stress of the asphalt pavement and ice-roller parts were less than their yield strength,the ice-roller speed was optimized.Ice-rollers with cutter arrangement parameters were analyzed with finite element method and optimized.by using orthogonal test to select the optimal cutter arrangement.This study provides a method,basis and reference for the design and manufacture of ice-roller.