Based On Labwindows/CVI Train Aerodynamic Software Design Of The Test And Data Processing

With several major domestic rail passenger line after another opened, increasing the speed of trains. Accordingly, the train traffic safety becoming an increasingly important issue of concern, particularly in aerodynamics problem gets more attention. To high-speed train, tunnel operation, exposed to strong crosswind conditions may produce significant aerodynamic load. Poor body tightness when running at high speed of vehicles inside the air pressure outside the vehicle and change the pressure wave. If the pressure changes inside the vehicle speed exceeds 200Pa/S, the cause of pain or even ruptured eardrums passengers. In order to avoid pressure on the adverse effects of passengers, the vehicle must take certain structural improvements, therefore commenced studies at home and abroad.Train aerodynamic drag and air pressure wave on traffic safety, body structure and the impact on passenger comfort. Between trains and ground movement of air caused by the media as the train changes the flow field, resulting in the continuing role of the aerodynamic loads, the vehicle will also be a lot of dust inhalation. Equipment cabin on the train's pneumatic wave test, control equipment cabin at high speed when the aerodynamic load characteristics of the different line conditions, different operating conditions on the aerodynamic loads of equipment cabin, verification equipment cabin aerodynamic loading design standards.At present, many applications external surface of the hole pressure measurement methods for detection, due to line environment is complex, and more prone to dust clogging pores. Traditional data acquisition system for the lack of communication interface flexibility, this paper proposed based on LabWindows/ CVI high-speed data acquisition system, built based on TCP/IP protocol of the control system network. NS-I1 by twelve pressure transmitters and the NI M Series USB6255 company as a communication and control chip, select LabWindows/CVI language to build data acquisition system software platform, called DAQmx task and designed PC data acquisition system of communication software to enable the train to collect equipment cabin pressure fluctuations; while using LabWindows/CVI library of advanced data analysis of the data Butterworth low-pass filtering, also called curve fitting engine Matlab functions and complex library file applications, data display and processing results.Experiments show that the system is simple, fast, strong anti-interference, high reliability, fully meet the design and use requirements.