Design Of Data Acquisition System For MU Wind Source System

The motor vehicle air supply system is an important system which provides clean air for the brake system.Its normal and stable operation is crucial for the safe operation of the brake system and even the entire EMU.At present,the detection of the failure of the wind source system relies more on the manual maintenance of the vehicle when it is put into storage,and it cannot guarantee the comprehensiveness of the fault detection and detection around the clock.However,the premise of solving this problem is to obtain the data of the wind source system in real time without interruption,so designing a data acquisition system for the wind source system has profound significance and practical value.The main work of this paper is as follows:Firstly,the basic composition and working principle of the wind source system are analyzed.The faults in the wind source system are classified and qualitatively studied Combined with the requirements of fault detection and diagnosis,two main data acquisition system designs are obtained.The first is to realize the data acquisition subsystem for the representative components such as the minimum pressure valve;the second is to realize the data acquisition subsystem for the pipeline.In order to realize the data acquisition subsystem of the component,the CFD flow field simulation method is used to study the components,and the numerical distributions of physical quantities such as flow velocity and pressure in the normal and faulty components are obtained,and different physical quantities are used as fault features for fault diagnosis,which is accurate according to fault diagnosis.Rate selects the physical quantity to be collected,then determines the selection and layout of the sensor,and implements the data acquisition subsystem for the component.In order to realize the data acquisition subsystem of the pipeline,combined with the working environment and requirements,according to the prior knowledge,the acoustic wave sensor is selected to collect the elastic wave signal emitted by the pipeline leakage,and the wavelet packet denoising algorithm is used to suppress the interference from the environment,and the delay estimation algorithm is used to locates the leak location.According to the positioning accuracy,the selection of sensor and the quantity and layout of sensor are decided.Then the data acquisition subsystem of the pipeline is realized.Finally,the previous data collection sub-programs are summarized and detailed design schemes are given.The hardware includes the acquisition module,the processor module,the communication module and the power module,and gives the circuit design diagram;The software part includes resource configuration function,data acquisition function,data communication function and parameter configuration function,.Then communication protocol format,serial port protocol and host computer operation interface are designed.Finally,the data collection experiment was carried out.The experimental results verified the effectiveness of the designed data acquisition system.