Optimization Design Of Front Door Structure Of A Passenger Car

The front door is one of the important components of the car.When the rigidity of the door is insufficient,it is easy to cause the door to be tightly sealed,stuck,and the drive resonance occurs,which has a great influence on the comfort of the vehicle and the safety performance of the vehicle.The paper simplifies the structure of the front door through CATIA software,and then pre-processes the simplified three-dimensional digital model by Hypermesh software,including simplifying the three-dimensional model,meshing,material property determination and giving,etc.The meta-model,based on reading a large number of domestic and foreign references,determines the research on the front door structure,including the overall rigidity of the front door,the attachment point stiffness and the modal analysis.According to the results of finite element analysis,it is determined that the front door needs to be optimized.Referring to other models at home and abroad and combining engineering experience,various optimization schemes are proposed to make the door stiffness and modality meet the enterprise standard requirements.Based on this,the sensitivity analysis of the door is carried out,and the sensitivity values of door quality,modality,window frame stiffness,lower torsional stiffness and inner belt line stiffness for the thickness of each door component are analyzed.Finally,7 parts are selected as the door light.Quantify the design variables of the design.Establish a multi-target optimization model for the door in Isight software.The door stiffness is the optimization constraint,the door quality and the first-order modal frequency are the optimization targets.The experimental sampling data and the approximate model were collected using the Latin hypercube design(Opt LHD)and the second-order response surface method(RSM).Through the NSGA-II algorithm,the optimal optimization scheme of the door is found,and the optimal design of the door structure is further realized.After optimization,the rigidity and modality of the door meet the design standards of the enterprise.The door quality is reduced from 20.63 kg to 19.81 kg at the present stage,and the weight reduction ratio reaches 3.9%.The front door structure of the paper is optimized for the passenger car model.The front door structure design hascertain engineering reference value.Figure [77] table [32] reference [54]...