CIP Method For Air In Brake System Of Mining Vehicle Application Research Of Air Flow Pulsation

As the bloodline of the industrial transportation field,mining trucks play an important role in China.The quality of the braking system is an important indicator to measure the performance of mining trucks.Closely related.Under different working conditions,the phenomenon of airflow pulsation generated by the pneumatic braking system of the mining truck is inevitable.The phenomenon of airflow pulsation is one of the main factors leading to insufficient braking force of the mining truck.In order to improve the service life of mining vehicles,it is particularly important to study the accuracy of pipelines when pulsating airflow occurs.Because the gas column has the characteristics of compressible and thermal conductivity during the flow in the pipeline,these factors need to be considered when improving the mathematical model of the gas dynamics to improve the calculation accuracy of the pipeline.At the same time,the problem of excessive gradients between grids in the process of analyzing pipelines using traditional differential formats will reduce the accuracy of pipeline research.Therefore,to improve the research accuracy of the pipeline,not only the flow characteristics of the gas column need to be considered,but also a more appropriate analysis method must be found.The CIP method is one of the more mature algorithms in the simulation of liquid flow.This method is widely used in the study of the cross problem of liquids.Due to the high calculation accuracy of the CIP method,the method is now applied to the study of pneumatic pipeline air columns instead of the traditional differential format.The CIP method can not only reduce the numerical dissipation in the calculation process,but also be stable compared to the traditional differential format.Sex is stronger.In this paper,the pneumatic brake system of the mining vehicle is gradually simplified,and the sub-circuit part of each pipeline connection is specifically introduced.Using the small hole flow characteristics to approximate the virtual boundary conditions of the pipeline equation,after comparing and analyzing the threetraditional differential formats of upwind difference,central difference and Lax-Wendroff format,the upwind difference with better accuracy and stronger stability is selected format.Through the explanation of the principle of CIP method,the establishment of mathematical model and the fitting analysis of the relationship between pressure,density,temperature and time in pipeline,it is proved that CIP method can be applied to pneumatic pipeline.Through the calculation of the natural frequency of the gas column and the establishment of the finite difference wave equation,the CIP method is further applied to the study of pipeline airflow pulsation.Taking the fast Fourier transform and the credibility analysis of relative error as the research premises,five groups of 2 ~ 50 m different pipeline lengths are selected for numerical calculation.After analyzing the ratio deviation of the natural frequency,the traditional gas column is inherently The frequency range is steadily adjusted from(0.8~ 1.2)to(0.8241 ~ 1.2241).Through the application research of the CIP method in the pneumatic brake system of the mining vehicle pneumatic braking system,it provides a theoretical basis for the application of the CIP method in the gas field.