Study On Optimization Of Tractor Pneumatic Braking System Based On AMEsim

In recent years,with the continuous growth of road logistics business,relevant ministries and commissions have vigorously promoted the upgrading and efficiency of the logistics industry,promoted new types of freight organization,and improved the technical level of transportation equipment.New modes of transportation such as sling-and-height transportation,modular transportation,and ro-ro transportation are developing steadily.As the main carrier of transportation,automobile trains are particularly important.A towing vehicle is a unit with driving capability in a car train,and a pneumatic braking system is generally used.In order to improve the braking safety performance of the vehicle train,the optimization of the traction vehicle pneumatic brake system has always been the research focus area.The braking system response time and the mechanism execution time will directly affect the braking performance of the vehicle train,mainly reflected in the traction during braking.Coordination and stability of vehicles and hanging workshops.Therefore,optimizing the traction vehicle air brake system and improving the response time of the brake system are of great significance for improving the brake safety performance of the train.This study first analyzes the composition of the traction vehicle's pneumatic brake system and the working principle of the main components,and establishes a mathematical model of the brake response time.The main factors affecting the brake response time are the source pressure and the pipeline radius.,length,effective cross-sectional area of the brake chamber,combined with the static/dynamic brake measured data of the recommended model of the third batch of hanging transport,focusing on the impact of various factors on the brake response time.Secondly,through AMEsim,the simulation models of the main components such as brake valve,relay valve,ABS pressure regulating valve,brake chamber and pipeline are established,and the system modeling is carried out to verify the effectiveness of the simulation model.Then the parameter optimization model of the pneumatic brake system is refined,that is,the radius and length of the pipe connecting each component of each component and the piston diameter of the brake chamber are selected as design variables,and the combination strategy of numerical optimization algorithm and global exploration method is selected.Algorithm,the front and rear axle braking response time is minimized to the objective function.Taking the source pressure as a variable,AMEsim and the multidisciplinary optimization design software Isight were jointly simulated and optimized,and the influencing factors after optimization were obtained.The research results show that under the pressure of 800 kPa air source,the 114 effective iteration schemes are optimized.The best solution after optimization makes the front axle braking response time of the traction vehicle of the air brake system shortened by 0.14 s.The time is shortened by 0.08 s.The optimization results under different air source pressures show that the best parameter matching results can be achieved when the air source pressure is 900 kPa.At this time,the optimized front and rear axle braking response times of the towed vehicles are shortened by 0.15 s and 0.11,respectively.s,improved brake safety performance.In the simulation process,it is also found that the influencing factors of the braking response time need to consider the matching of each parameter in the optimization design to get the best optimization result.