Research On Optimal Design And Fatigue Analysis Of The Auxiliary Frame Of The Concrete Mixing Transport Vehicle Based On Topology Theory

With the strict control of the overloaded vehicle,the economic operation model of the precast concrete merchant is greatly affected.In order to adapt to this new condition,research and development of lightweight concrete mixing transport vehicle has become a new development direction.The concrete mixing transport vehicle often drive on the uneven muddy road for a long time,and the mixing cylinder rotates at the appropriate angular speed with the hydraulic reducer,resulting in the deviation of concrete barycenter.Under the repeated action of alternating load for a long time,the auxiliary frame of the concrete mixing transport vehicle is prone to fatigue failure or fracture.These conditions are the key considerations for the lightweight study of the auxiliary frame about the concrete mixing transport vehicle.In this paper,the auxiliary frame of the concrete mixing transport vehicle is the research object.First of all,the law of the concrete barycenter in the working process is studied,and the concrete barycenter is divided into the fixed barycenter and the change barycenter,and the change barycenter is studied in detail.Secondly,the working conditions of the concrete mixing transport vehicle are studied,and six typical working conditions which have influence on the fatigue failure of the auxiliary frame are summarized,and the load on the front and back supports are calculated according to the six typical working conditions.And then the finite element statics simulation of the auxiliary frame of the concrete mixing transport vehicle is carried out according to six typical working conditions,and the topology optimization simulation design is carried out according to the results of the finite element statics simulation.Next considering the topologjy optimization simulation results of six typical working conditions,combined with the process manufacturing level and manufacturing cost,the frame type auxiliary frame of the concrete mixing transport vehicle is designed.Finally,according to six typical working conditions,tlhe finite element statics simulation analysis and fatigue simulation analysis are carried out to verify the rationality of the frame type auxiliary frame of the concrete mixing transport vehicle.From the results of finite element statics analysis of the frame type auxiliary frame,we can know that the strength and stiffness of the frame type auxiliary frame are decreased except for the full load turning condition and the full load wheel suspension condition,and the working condition with the largest Total Deformation value is driving uphill with full load,and the drop value is 42.24%.And the working condition with the largest Equivalent Stress value is downhill driving with full load,and the drop value 56.88%.However the full load wheel suspension condition rarely occurs,which can be avoided by paying more attention to road conditions.And full load lateral turning condition can reduce the damage to the auxiliary frame by limiting the turning speed.After optimization,the weight of the auxiliary frame was reduced from 1597Kg to 766Kg,achieving the results of lightweight,reliability and durability.At the same time,the reduced quality of the auxiliary frame can be loaded with the same quality of concrete,which brings intangible benefits to the concrete business.