Finite Element Analysis And Optimization Of The Body Structure And The Pushing Arm Of High Speed Bulldozer

The bulldozer,one of the most widely used construction machinery,plays a significant part in infrastructure construction and national defense construction in our nation.With the development of construction machinery especially bulldozer in the construction field,it need an advanced dozer that can not only doing the normal work of dozer but the higher moving speed(60km/h)when needed.And compare to the normal dozer it can bear mal-condition,can have a lower failure rate,can adapt to most terrain,etc.The goal of project is that it can become a universal platform of crawler construction machinery that can fully use the mature technical and the existing component of the normal dozer and that can also consider the developing requirement of construction machinery.The bulldozer that this paper concentrate on is a requirement that to fit the need of construction field,it need to redesign the dozer based on the old type.Exchange it’s track with high speed track,then add the suspension system on the bulldozer to make it has the ability of high speed drive.The whole dozer is consist of the pushing system,working system,defense system,electrical system,electronic information system,and other component.This thesis will focus on the dozer body structure,provide a simulation result through FEA to the design group.Then doing the topological optimization to the pushing arm which can make the dozer moving faster and can also balance its weight between the dozer blade and the Scarification hook.This thesis main content is as follows:First of all,we need to analysis the working condition of dozer blade.Then we use the analysis result to calculate its structure stress.After that we use the stress state to support the simulation model.When the above tasks is completed,we introduce the working system of the structure,then analysis its working condition while doing the bulldozing job.Finally we use the parameter to do the simulation.Secondly,this thesis introduce the component of the high speed bulldozer.Then build the finite element model of body structure and dozer blade.Get the simulation result by using Ansys cooperating the material of its body structure.Then doing the same job to the dozer blade.Thirdly,in order to balance the center of gravity of the body,doing the topological optimization to the pushing arm of dozer blade.Using the date of extreme working condition to define its boundary condition and the optimized object.Then get the optimized model.Calculate the stress and the strain of the optimized model.Make sure it is useful.Finally,summarized the whole article,and the next part of study was proposed based on the result and the lack of this paper.