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The Research and Simulation of Space-Variable-Ditital-Filter

Author: LiLinFeng
Tutor: LinJianHui
School: Southwest Jiaotong University
Course: Measurement and Control Technology and Instruments
Keywords: Track Irregularities Inertial reference method Eliminate the speed factor The space transform domain analysis The space shift change digital filter
CLC: U216.3
Type: Master's thesis
Year: 2007
Downloads: 60
Quote: 0
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Abstract


The track irregularity train excitation source , is the impact the high-speed train running comfort and stability of the main factors , line terms of restricting the speed of traffic due to the railway line management . Test track irregularity and make a scientific assessment of the significance of China's railway construction . The United States, Germany , Japan , France and other countries in the track inspection technology walking in front of the world , they all raised their detection principles and analytical methods . China based on the digestion and absorption of foreign technology , in accordance with its national railway running condition , the detection method of the analog - digital cascade system . This article is based on this method was exploratory research , and get satisfactory results . This article describes the track irregularity of nature , classification and significance ; expounded the basic theory of space signal transform analysis , including continuous space transform domain , discrete space transform analysis and spatial sampling theorem three parts ; study time and space relationship , the contact time space relationship . Specify the time and the theoretical transform domain analysis spatial spectrum limitations . Then , inertial reference method based on detailed analysis of the distortion of the former level simulation system : the sensor frequency conversion distortion and anti-aliasing filtering of the amplitude and phase distortion ; completed based the space Ls sampling digital filter shift change design , preferably compensates for the system foreline distortion . The analog - digital cascade system method to eliminate the impact of the speed factor , the data collected truly reflect the track irregularity wavelength ; MATLAB simulation validated the feasibility of the method . Finally , further research based on the limitations of the system TS sampling .

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CLC: > Transportation > Rail transport > Railway Line Project > Railway maintenance and repair > Line detection equipment, test automation
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