Analysis And Research Of Loading Axle Load Detection Method Based On Multi-Axis Vehicle Lifting Load Axle Load Calculation Model

The braking performance of a car is undoubtedly the biggest factor affecting the active safety of the vehicle during driving.Through the statistics of a large number of motor vehicle traffic accidents,it is found that the serious consequences of traffic accidents in heavy-duty trucks are the most destructive and the highest casualty rate among all traffic accidents.Therefore,the braking performance of heavy vehicles Regular inspections are necessary,but scientific and rational testing methods are more critical.At present,under the implementation of the new national standard,the equipment for detecting the braking performance of multi-axle heavy-duty trucks is a counter-force drum-type loading and lifting brake platform with lifting function.The new national standard clearly stipulates for multi-axis vehicles.The intermediate shafts must be lifted by 100 mm or loaded with a shaft load of 11.5 tons to perform braking performance tests to simulate the driving conditions of the vehicle when it is fully loaded.However,through the author's long-term observation,the lifting height of 100 mm does not make the intermediate shaft load of all the vehicles under test equal to the axle load at full load,and the load axle weight obtained after lifting the vehicles with different suspension forms is very different.Therefore,this paper has carried out related research on this phenomenon.Based on a large number of domestic and foreign literatures,this paper expounds the principle and process of detecting the braking performance of multi-axis vehicles using the loading brake table.The mathematical model of multi-axle vehicle was built by using the relevant mechanics calculation formula,and the main influencing factors of the axle load during loading and lifting were the center of gravity of the vehicle,the suspension stiffness and the suspension structure.In order to obtain the relatively accurate position of the center of gravity and the stiffness of the suspension,the author used the gravity center position dynamic detection method and the lifting method to measure,which provided the necessary data support for the next simulation work.Next,the author classifies multi-axis vehicles and selects a specific type of multi-axis vehicle for simulation.Firstly,the solids software is used to build the vehicle-test bench solid model.The solid model of the vehicle focuses on the relatively accurate drawing of the vehicle's suspension system to ensure the accurate size of each component,which lays a foundation for the next mechanical simulation process.Then,Adams software is used to add related constraints and motion pair elements to the solid model and complete the mechanical simulation work.The data obtained by the simulation is processed and analyzed.It is found that the lift height and the load axis load are approximately linear,and the data is simulated.Combine to find the mathematical expression between the two.In order to verify the correctness of the above mathematical expressions,the author designed the relevant experimental scheme,selected a number of heavy-duty trucks with specific models and axle numbers as the experimental objects to carry out the real vehicle test,and processed and analyzed the test data.The mathematical expression between the lifting height and the loading axis load in the actual state is compared with the expression obtained by the simulation to verify the correctness of the simulation results.This paper can provide a certain data reference for the loading and braking detection of multi-axis vehicles,and has certain practical value.