Vibration Characterization And Modal Performance Matching Study Of A Type Of Cargo Vehicle

NVH characteristics analysis occupies a very important position in the vehicle development process,its performance is affected by many factors and varies greatly,and vibration performance is the basis of its key performance,and is increasingly valued.Combining vibration analysis theory and rigid-flexible coupled multi-body dynamics theory,the finite element model of the relevant structure and the rigid-flexible coupled multi-body dynamics model were established through Hyper Mesh and ADAMS.Their dynamic characteristics and whole vehicle smoothness based on road surface excitation were studied by simulation analysis.Based on the theory of automotive vibration analysis,two types of automotive vibration analysis methods related to rotation speed and vehicle speed were proposed,and the rigid-flexible coupling model of lorry was established.Firstly,the rigid model of each subsystem was built in ADAMS/Car,and the finite element method was used to build the finite element model of the cab white body and frame structure.Then the generated modal neutral file was imported into ADAMS to generate the flexible body model,and finally assembled into a complete vehicle model.Modal analysis of the model was performed in Hyper Mesh,and the simulation results were validated against the modal test results to evaluate the dynamic performance of the vehicle.A stochastic pavement model was built in ADAMS,and the built full-vehicle model was simulated for driving smoothness based on pavement excitation.The full-vehicle vibration performance of the truck was evaluated using the acceleration information obtained for the driver's seat at 60 km/h,80 km/h and 100 km/h.Finally,a modal performance matching study was conducted,including modal matching strategies and methods.In response to the vibration problems of the Class ?chassis models studied,improvements have been made to the modal matching of tires and body-frame structures.The solution is based on sensitivity analysis to study the influence of the thickness of each component on the frequency parameters of the body-frame structure,and dimensional optimization using the component thickness as the design variable to obtain the design results that meet the modal frequency matching requirements and achieve the research objectives.