Inspection and Identification Techniques for the Track Irregularities

• Main Authors: Hsin-chu Tsai, 蔡欣局
• Other Authors: Chung-Yue Wang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/49557640732453740468

博士 === 國立中央大學 === 土木工程研究所 === 100 === The requirements for inspection and management of track irregularity have to be more rigorous due to safety and serviceability concerns as the increment of the train speed of high speed train. The wavelength of track irregularity significantly affects running safety and riding comfort. To improve inspection operation efficiency and address the inability of the mid-chord offset method currently used on track inspection cars to identify some irregularity wavelengths, a measurement and assessment method is presented in this paper. Non-stationary and nonlinear vehicle dynamic response data caused by irregularities were measured by accelerometers mounted on the axle-box of a vehicle. The Hilbert-Huang Transform (HHT) technique was applied to analyze the data. Components of specific irregularity wavelength could be effectively identified and accurately matched to the data measured by the track inspection car. Additionally, to obtain the complete waveform of the track irregularity, this paper propose a restoration method of track irregularity that combines the characteristics of the measurement magnification in the chord-based measuring system and the HHT signal processing techniques.