Weight Lightening Of The Carriage Of The Dump Truck Based On The Constraints Of Strength

Weight lightening technology of automobiles can reduce the manufacturing cost of thevehicles and increase the cargo capacity of the vehicles simultaneously. It also increasesthe environmental safety of vehicles. In recent years, automobile light-weighting isbecoming an important development trend of the auto industry. Automobile weightlightening is not only reduction of the weight of the vehicles, is but also the combinationof the function improvement, weight reduction, manufacturing cost reduction and thestructural optimization. With the development of computer hardware and software,computer aided engineering (CAE) technology is more and more mature. In order todesign vehicles with better performance and lighter weight, CAE technology, and thenumerical and simulation methods, such as finite element method, has been widelyapplied. In the current research process of automobile weight lightening, however, thestructure optimization of automobiles is generally based on empirical conclusions andapplied to the parts of the vehicle. To solve this problem, we make an exploration in thisthesis.Using CAE softwares in HyperWorks platform, we optimize the structure and lightenthe weight of the carriage of a dump truck under the condition of lifting moment. Firstly,we use HyperMesh in geometry cleanup and finite element mesh division of the3Dmodel of the carriage. Then, we use Radioss in statics analysis of the whole carriage.Later, we use OptiStruct in the topography optimization of all the platforms to determinethe location of the strengthening rib, the target of this procedure is to minimize the static stress of the element that has the maximum static stress. Thereafter, we apply the shapeoptimization and size optimization to the strengthening ribs, subjected to the constraintof strength, to minimize the weight of the whole carrying part.After optimization, the total mass of the carriage was reduced by7.2%. The structureof the carriage is more reasonable. In this thesis, we have not use the empiricalconclusions. The validity of the finite element method in the vehicle structureoptimization and weight lightening is verified. A new thought of the vehicle design andstructure optimization is provided. It may be helpful in the further research.