Study On Data Processing Of Second Generation Inspecting Instrument For Static Geometry Parameter Of Track

The railway system is an important supporter for national economy. As our country's economy is growing, a quick and convenient railway is needed. The speed and stability of train is determined by the static geometry parameter of track. For this reason, not only the technical specifications of constructing railway is required more highly, and the precision of inspect instrument used to maintain the railway also is required more highly. This subject comes from the joint development project on second generation RTMI (railway track measuring instrument) lunched by Jiang Xi RYM Company and Nan Chang University. This paper consists of seven chapters.In chapter one, the train stability is described and three main parameters which affect train stability are illustrated. Two inspecting models and domestic and overseas present research are introduced. Lastly, the work of this paper is presented.In chapter two, firstly the principles of inspect instrument for railway track are illustrated, and the advantage of using FOG (fiber optic gyro) are discussed. Secondly, the design of core component that measures angle is given.In chapter three, firstly, the principles of wavelet analysis and threshold filter are introduced. The outlines of multi-resolution analysis and Mallat algorithm are given. Secondly, the effect of FOG's zero shift on angle measuring is discussed. The methods based on FIR and wavelet threshold filter to process the output of FOG are given. The choices of decomposition level and threshold are given. Finally, the effect of rail joint on measuring is analyzed. The method based on wavelet analysis and local maximum to solve it is given.In chapter seven, the reason of measuring error that second generation RTMI have in measuring rail gauge is discussed and the method to solve the error is given.In the last chapter, summary of this paper and the prospect of the further study are given.