Ultra-high Speed And Low Vacuum Pipeline Maglev Train Surface Pneumatic Resistance Detection System

When the low-vacuum pipeline maglev train(hereinafter referred to as the high-speed speeding train)moves at high speed,there is still a pneumatic resistance influence in the low-vacuum environment.Real-time detection and collection of the distribution of pneumatic resistance on the surface of the train,for the train shape design,vehicle power configuration and operational stability control is of great significance.In this paper,a dynamic detection system of pneumatic resistance on the surface of the train with high precision and high acquisition frequency is designed for the working environment of the vehicle-pipeline system during the high-speed speeding train experiment.In this paper,the aerodynamic characteristics of the high-speed speeding train during operation are analyzed,the aerodynamic resistance equation of the train is estimated,and thek-ε two-way model is used to carry out FLUENT modeling and simulation research.Based on the pressure scanning valve to design the pneumatic resistance detection system,which mainly includes the design of the power supply module,control module,network module and shell structure,the pneumatic resistance detection system contains 128 acquisition and measurement points,using UDP communication protocol,data are transmitted to the data processing center via the control circuit module;after analyzing the shape of the high-speed speeding train,a total of 128 pressure measuring tube holes was reasonably arranged on the surface of the train,and the pneumatic resistance detection system was subjected to environmental experiments,which verified that the system could work in the high-speed speeding train operating environment,and the pneumatic resistance detection system collected128 points of dynamic pressure at a sampling frequency of 128Hz/channel,and monitored the aerodynamic resistance distribution on the surface of the train under the operating state.Finally,a joint experiment and debugging was carried out in the ultra-high-speed pipeline maglev vehicle system,and the surface pressure distribution data of the train at a speed of 140km/h was measured,and the results were compared and analyzed with the simulation data,which accumulated experience for the shape design of the train.During the experiment,the system works stably and has complete functions,and the communication with the data processing center switch is normal,which meets the requirements of equipment support.