Topology Optimization Of A Mountain Crawler Transport Vehicle Fram

Mountain crawler transport vehicles are widely used in mountain orchards,woodland wood and other materials transportation vehicles,and their working conditions are very harsh.The frame is the main body of the tracked vehicle.It not only bears the weight of the powertrain,container,and chassis of the tracked vehicle,but also bears various forces and moments generated by the tracked vehicle during driving and loading.The reliability of the frame of the mountain tracked transport vehicle determines whether the tracked vehicle can work normally,and also directly affects the driving safety of the tracked vehicle.Therefore,it is necessary to conduct in-depth research on the frame structure of mountain crawler transport vehicles.First of all,this paper selects a certain tracked vehicle as the research object,its external dimensions are 1300×650×350 mm,and a three-dimensional model of the original frame is established in the software according to the actual size.Apply the load and boundary conditions corresponding to the full load condition to the original frame,establish its finite element model,and carry out static analysis and dynamic analysis in Ansys.Through static analysis and dynamic analysis,the maximum equivalent stress of the original frame under full load conditions is 108.59 MPa,the maximum stress is concentrated in the main load-bearing part and the maximum deformation of the connecting part is 1.564 mm,and the maximum deformation position is in the dynamic load-bearing part.Secondly,in order to reduce the mass of the frame and improve the stiffness and strength of the frame,the topology optimization of the original frame is carried out,with the goal of maximum stiffness,the maximum stress not exceeding 157 MPa,and the minimum mass not less than 30% of the original structure as constraints Carry out topology optimization,redesign the frame structure according to the optimization results,and establish an optimized three-dimensional model of the frame;change the thickness of part of the frame structure through size optimization to achieve the effect of reducing the quality of the frame;through modal analysis,get the frame The natural frequency and mode shape diagrams of the free mode and the constrained mode are far away from the20 Hz excited by the road and the 25 Hz excited by the engine,so no resonance will occur.Finally,evaluate the optimization results and establish an evaluation parameter E,whose value is less than 1,indicating that the optimization is effective,and the final evaluation parameter E=0.79,indicating that the design goal of frame optimization has been achieved.After optimized design,the weight of the frame is reduced by 7.5%,the maximum equivalent stress is reduced by 25.03%,and the maximum deformation is reduced by 31.84% compared with that before optimization.train of thought.