The Finite Element Analysis And Optimization For The Base Structure Of The Truck-mounted Concrete Pump Based On Parametric Calculation Program

As a kind of concrete pouring equipments with high-efficiency andhigh-flexibility, the truck-mounted concrete pump is increasingly playing animportant role in the construction field with the continuous progress of the nationalinfrastructure construction and urbanization. This also benefits a large number ofdomestic concrete pump manufacturers, which makes concrete pump widely used,and still has much room for development in the future.The concrete pump firstly appeared in our country less than forty years ago, butits manufacturing process, structural design, and intelligent control technology hasreached a high level, its stability and security continuously improves, the constructionaccident rate also increasingly reduces. But the researches in the pump truck aremainly concentrated in the boom system according to the papers published, while thebase structure relatively minority.As the main support part, whether the design of the base structure is reasonableor not directly relates to the stability and security of the vehicle. The structural stressand deformation is so complex due to its irregular shape and the vertical load andoverturning moment from the boom system and concrete that can not be calculatedand analyzed by classical mechanic methods. The various structural requirements,especially the mechanical properties, of the base structure are increasingly strict as theboom structure is getting longer and longer. An efficient calculation and checkingmethod is really urgent due to the rapid upgrading of product, the various types ofstructure and the shorter R&D cycle. In addition, because the design of the structureof domestic concrete pump is generally conservative, the optimization or lightweightresearch of the base structure is one way to reduce costs so as to improve thecompetitiveness.As the fact above, the finite element method and ANSYS are used in the staticmulti-condition analysis and lightweight research of the base structure for the HB56Aconcrete pump with the X-type legs due to their advantages in the analysis of thelarge-scale structure, in order to master the maximum stress and deformation of the various components of the structure and verify whether the strength and stiffnessproperties meet the design requirements. The expected goal of weight-loss are reachedafter the optimization. These can provide datas to support the improvements ofproduct design, and this kind of method can also be applied in the design anddevelopment of other different models or the same type of structures.First, the finite element model of the various components of the base structureare created in HyperMesh, the structure is parametrically assembled, loaded andconstrained with the ANSYS parametric design language which is short as APDL, theparametric calculation program of the base structure is written in DOS command andAPDL according to the requirements of multi-condition finite element calculation andthickness optimization.Second, the static finite element analysis of the base structure under theconditions of360-degree-rotation of the horizontally full-extended boom is finishedwith the parametric calculation program. The maximum stress and displacement,maximum reaction force of the legs, maximum axial force of the cylinder and thecorresponding conditions are got, and the results under the specific conditions aredetailedly analyzed. It verifies that the structure can not tip according to reaction forceof the legs.Then, the stress test of the base structure of the HB56A concrete pump is done tovalidate whether the finite element modeling, loads, constraints and the calculationresults of the structure are correct by the comparison of calculation results with testresults.Finally, the lightweight research of the structure is done according to the finiteelement results under multi-condition, including improvements of local structure withlarge stress, thickness optimization of the base structure and legs and topologyoptimization of the rear legs. And the optimized structure meets all performancerequirements after the reanalysis, which indicates that lightweight research is success.