Research On Joint Simulation And Lightweight Of Heavy-duty Vehicle

The lightweight of vehicle has long been a popular research topic,the significance of lightweight is related to the fuel economy of the vehicle,the effects of Carbon Dioxide Emissions from Combustion of Fuel on Global Greenhouse and the braking safety that is closely related to the weight of the vehicle.The current lightweight research on vehicle include the engine,white body,truck containers and so on.Heavyduty vehicle has great load and usually works in poor working conditions,drive axle housing is its main carrier,so the design of the axle housing is usually designed enough,which resulting in its performance overcapacity and weight increase,it seriously reduce the economy of the car.In view of this situation,relies on the Chongqing Science department "121" project,this paper build a joint simulation analysis platform to achieve the lightweight of the axle housing based on CAD / CAE integration technology.Firstly,build the axle housing 3D solid model using the Creo software according to its CAD drawing.Reasonably simplify its structure features to reduce the amount of calculation and to improve its accuracy.Set the four dimensions of the axle housing body and the steel plate spring seat as parameters.Build the corresponding parameter relationship according to the relationship between the parameters and size,size and size,which achieve the parameterization of the geometric model.Embedding ANSYS Workbench into Creo based on the interface technology of two software,which can realize the joint simulation of CAD and CAE.Analysis the force condition of the drive axle housing under the four typical working conditions.The corresponding analysis items are established,and the corresponding load and constraint are applied for each typical working condition in the Workbench.Besides,analyze the fatigue properties of the axle housing based on the modified S-N curve,the simulation results are evaluated by reference to the axle housing load test standard.Then analyze the first eight order modes and resonant frequencies of the axle housing,and the response of the simple harmonic forced vibration.According to the first order bending and the first order torsional resonant frequency,it is verified that it does not resonate in the working conditions.Then introduced the application of V-casting process about driving axle housing and verified the mechanical properties of the samples.Based on the Creo / ANSYS Workbench co-simulation platform,the target-driven optimization is carried out with the targets of the axle housing mass and the maximum equivalent stress,the response curves of four parameter variables were analyzed.The weight loss of axle housing was 19.6% while ensuring the mechanical properties of the drive axle housing.Finally,the software Trucksim was used to establish the vehicle model and the uneven road model to obtain the impact load value of the vehicle when it drives on the uneven road.It is concluded that there is a certain degree of conservativeness in the design that setting 2.5 times the static load as the impact load in traditional design rules,which proved that there is room for further lightweight yet.The innovation of this paper is the establishment of parametric axle housing model and Creo/ANSYS Workbench joint simulation platform,achieved the real-time changes and sharing of CAD / CAE data,greatly reduced the design and development ti me,improved the efficiency and reduced the uncertainty of the design optimization.The study of the impact load value under the uneven road driving condition provides a great reference value for the drive axle housing simulation load applying under this condition,which greatly enhance the reliability of the simulation analysis.