Track Sand Removal Truck Bionic Desilting Shovel Design And Drag Reduction And Wear Resistance Analysis

With the further implementation of the Northwest Development Strategy in China,more and more railway lines are being built in windy and sandy areas.Frequent wind and sand disasters in these areas have buried railway tracks,seriously affecting the normal passage of trains.In this thesis,the third generation of railway desander developed by the research group is taken as the research object.Based on the principle of bionics,the bionic optimization design of the desander of the railway desander is carried out,and the resistance reduction and wear resistance analysis of the desander sand pile is carried out by using the discrete element and finite element coupling analysis method.The main research content is as follows.Discrete element contact particle type and sand particle parameter calibration.Select appropriate particle contact types through discrete element theory analysis.The parameter calibration method combining experiment and simulation is used to measure the angle of repose of the actual sand pile and the angle of repose of the simulated sand pile for many times through the plate drawing method,and compare with the sand particles with different parameters set,and finally obtain the static friction coefficient,rolling friction coefficient,collision coefficient of restitution and other parameters between the railway sand shovel and the sand particles.Based on the principle of bionics,a bionic smooth surface desander for railway desander is established.Selecting three types of animals: voles,house mice,and brown bears as biomimetic objects,extracting the data points of the inner contour surface of the biomimetic object’s claws and toes,and conducting fitting analysis,it is found that the curve curvature and its variable curvature characteristics have a disturbance effect on the sandy soil.Establish three types of biomimetic smooth surface sand removal shovels by using three biomimetic fitting curves as the inner contour guide lines of the sand removal shovel.Analysis of the resistance of bionic sand removal and removal by railway sand removal vehicles.According to the operating conditions of the railway sand removal vehicle’s sand removal shovel,the sand removal resistance of different structures of sand removal shovels is analyzed at different depths of sand removal.The research results show that there is a positive correlation between the depth of sand removal and the resistance of the sand removal shovel.The drag reduction performance of the biomimetic sand removal shovel is better than that of the traditional sand removal shovel,among which the drag reduction performance of the biomimetic mouse sand removal shovel is better than that of other structural sand removal shovels.Biomimetic non smooth wear-resistant sand removal shovel and wear analysis.Construct biomimetic wear-resistant sand removal shovels with different stripe structures on the surface of scallops,and analyze the wear of biomimetic sand removal shovels for railway sand removal vehicles from three aspects: wear depth,normal cumulative contact energy,and tangential cumulative contact energy.The research results show that when the stripe height of the desander is 5mm,the stripe spacing is 15 mm,and the speed of the desander is 20r/min,the bionic wear-resistant desander of the railway desander has better wear resistance than other bionic wear-resistant desanders.Strength analysis of biomimetic sand removal shovel structure using discrete element finite element coupling.Import the pressure load obtained from discrete element analysis into the finite element method,and use the finite element method to analyze the structural strength of the bionic sand removal shovel to ensure that the optimized railway sand removal shovel meets the usage requirements.