Research On Fine Modeling And Engineering Application Of Freight Car Leaf Spring

Leaf spring is an important force transmission and elastic element in the suspension system of trucks.Its performance has an important effect on the ride comfort of trucks.Due to the non-linear contact friction between the reeds,there is currently no modeling method for leaf spring stiffness and damping that can meet the engineering requirements.This paper mainly studies the influence of refined modeling methods of leaf springs and their parameters on the ride comfort of the vehicle.The main tasks of the paper are as follows:1.Firstly,the research status of leaf spring modeling and the commonly used leaf spring modeling methods are introduced.The leaf spring model is established by discrete beam(Beam)and finite element method,and its stiffness is analyzed initially.In order to obtain more accurate leaf spring stiffness characteristic parameters,the error of leaf spring leaf spring test stiffness and simulation stiffness is used as a correction function,and the Insight module in ADAMS is used to modify the stiffness of the discrete beam model.The results show that the corrected leaf spring stiffness and test static stiffness error can be controlled within 5%,indicating that the accuracy of the leaf spring static stiffness of the discrete beam(Beam)model meets the requirements and can be used for subsequent vehicle ride comfort modeling and simulation.2.Based on the data provided by the enterprise,a vehicle dynamic model of a certain type of truck was established,and under typical shock conditions,based on the integration of ISIGHT with ADAMS / Car and MATLAB,the established vehicle dynamic model was modified.The results are compared with those of the real vehicle corresponding working conditions,and the results show that the modified dynamic model of the truck can better simulate the vibration response of the real vehicle.The driving simulation of the modified vehicle model on a C-level road is completed.The results show that the dynamic characteristics of the modified truck dynamic model are closer to the actual vehicle performance.3.Based on the modification of the vehicle dynamics model,further simulation analysis and research are conducted on the ride.The main content is to select the parameters that have a greater impact on the ride of the vehicle from the sensitivity analysis.Based on the experimental design,an approximate model of the response surface reflecting the relationship between the input and output of the vehicle system was constructed,and the accuracy of the response surface polynomial equation was checked by determining the coefficient and adjusting the determination coefficient.Finally,the particle swarm algorithm was used to optimize the leaf spring parameters Designed to reduce the maximum and minimum vertical acceleration at the cab seat rails,and apply the optimization results to application verification.The results show that the maximum peak vibration response of the z-direction vibration of the improved vehicle model cabin seat rail test point is significantly reduced,with a maximum decrease of 22.33% and a minimum peak decrease of 11.4%.The ride comfort of the vehicle has been significantly improved.