Characteristics Analysis And Optimization Design Of Recreational Vehicle Body

With the rapid development of my country’s economy,people’s living standards have improved significantly,and they are no longer limited to urban travel.More people yearn for the quiet landscapes,enjoy the beauty of nature,and improve their quality of life.This makes Recreational Vehicle sales and The amount of preservation continues to increase.Due to the special tourism attributes of Recreational Vehicles,the safety and mileage of the Recreational Vehicle body are more important than ordinary passenger cars.For the HHD5030XLJ2 Q Recreational Vehicle body model,this article calculates the dynamic characteristics and fatigue life of the body through the limited element analysis and multi-body dynamic analysis,and through optimized design,the body lightweight design is achievedFirstly,according to the drawings provided by the enterprise,the threedimensional model of the vehicle was established,and the model was extracted,simplified,meshed and bounded by extracting the middle surface,simplifying the model,and imposing boundary conditions to complete the establishment of the finite element model.Secondly,the strength characteristics of the car body were analyzed under five working conditions: horizontal bending condition,ultimate torsion condition,emergency braking condition,emergency turning condition and camping condition.The bending stiffness and torsional stiffness of the body are then analyzed and calculated.After calculation and analysis,the strength and rigidity of the body meet the requirements of use.The modal analysis of the car body is carried out,the natural frequency and mode shape of the 16 th order mode before the body are obtained,and the common external excitation frequency during the vehicle driving process is co MPared,and it can be seen that the natural frequency of the body can avoid the common external excitation frequency and will not resonate phenomenon.Then,the multi-body dynamic model of the whole vehicle is established,and the road surface simulation at all levels of the whole vehicle is carried out,and the timedomain load spectrum at the connection between the suspension and the body is obtained.The obtained time series is then input to the car body,and the fatigue life of the body is evaluated by the nominal stress method.After calculation and analysis,the minimum life cycle of the body is 3.79E+08 times,that is,the body has an infinite life.The reliability test results were consistent with the simulation results,and the body did not experience fatigue failure.Finally,combined with the results of strength analysis,the lightweight design of the car body is carried out.Taking the thickness of the body plate as the design variable,the body strength analysis result as the constraint,and the lowest body quality as the optimization goal,the Screeing screening algorithm was used to obtain the optimal solution.The finite element analysis of static and dynamic characteristics of the optimized car body is carried out.After calculation and analysis,under the premise of meeting the requirements of vehicle use,the body weight was reduced by 25 kg,accounting for 3.9%.