Application Of Virtual Instrument And Database In A Testing System For Landing Gear

In this dissertation, based on the state of the art, the exiting problems and the practical requirements of tradition testing instrument. Virtual Instrument is deeply investigated. In the dissertation, a parameter testing system working for the airplane's landing gear based on Virtual Instrument is researched. Automatic testing, data processing and data saving are realized in the testing system.The main contributions of the dissertation are summarized as follows:1. Hardware of testing system is designed. To satisfy demand of parameter testing system working for the airplane's landing gear, the devices of the instrument are chosen. They are PXI chassis, SCXI chassis, DAQ, SCXI-1125/1126 modules and SCXI-1327/1338 terminal block and so on.2. Software of tesing system is designed. The testing system adopts LabVIEW as the development tool of the software, and it is designed modularly. It improves dependability and efficiency. The software of testing system is composed of five function modules (item, edit background, data collection, data analysis and help). And it realizes some correlation parameter's data acquisition, realtime showing, data playing back, analysis of amplitude and phase spectrum, data saving and report generation conveniently.3. Low filtering of sampling signals is realized. In this dissertation, there are two software methods to achieve it. One is to run the Matlab program with LabVIEW. The other is to make use of LabVIEW Data Analysis Toolkit from NI corporation. White noises ofen mix in the sampling signals during aquisition. so sampling signals have to be processed. In the end, sampling signals are filtered with the signal conditioning modules and program which is developed with LabVIEW Data analysis Toolkit, and the waveform graphs sampling signals which are processed with low filtering before and are processed with low filtering after are shown.4. Sampled data is saved into the Database. The testing system working for the airplane's landing gear makes use of LabVIEW SQL Toolkit from NI corporation to manage the sampled data. It realizes the data's saving, index, modification and deletion. In order to manage Database conveniently, a software of Database management is designed with VB. The software of Database management with VB is composed of user management module, inquiry experiment table module and Data management module.