Analysis And Experimental Study On The Structure Performance Of Vehicle Door

Vehicle door structure performance directly affects the normal use of the vehicle. If the performance of the door can’t meet the requirements, in use process may lead to the door can’t be normal open and close, abnormal vibration and noise, can’t seal, in the event of a collision can’t guarantee the crew’s living space and so on. Seriously affect the comfort and safety of the vehicle, it can be seen for the study of the structure performance of the vehicle door is very necessary.In this paper, the door body and attachments of a light bus vehicle as the research object, the main research contents include the following aspects:A finite element model of the vehicle door is established. The model is analyzed by free modal and the stiffness, found that the first mode frequency is low and may be resonate with the body. The model test and sinking stiffness test of the vehicle door are carried out. The finite element analysis results are compared with the experimental results to verify the accuracy of the finite element model.Based on the analysis standard of the door performance of an enterprise, refers to the domestic and foreign related regulations and research, a number of static and dynamic finite element analysis is performed, including door sinking stiffness, upper and lower torsion stiffness, stiffness of front and rear window frame stiffness, inner and outer panel waist stiffness, static and dynamic dent resistance, strength and crashworthiness analysis results show that meets the requirements in the performance of vehicle door. But the inner panel waist stiffness and initial extrusion endurance are very close to design boundary value.The sensitivity of the plate thickness of each component is analyzed by the mass, the first modal frequency and the sinking stiffness. Selected seven plates thickness as variable, using experimental design method of sample point sampling, and as a basis for establishing Kriging model of the door deformation under multiple conditions, mass of the door and first modal frequency. As some of the response accuracy does not meet the requirements, the corresponding condition stiffness introduced in order to improved accuracy of the model, make it meet the requirements. Based on the performance parameters of the vehicle, establish a mathematical model for the optimization of the door. Using multi-objective genetic algorithm to solve the optimization model, the best solution is selected in the solutions, and the engineering practice is considered to be adjust the final resultThe optimization of the door for simulation analysis, and compared with the original door. Results show that mass of optimization door is essentially same as original door, at the same time, sinking stiffness is meet the requirements, improves the other structure performance of the door, especially the first modal frequency of the door raise to 33.77Hz, door inner panel waist stiffness and initial extrusion endurance far away from the boundary of the design values.