Research On Measurement And Calculation Methods Of High Speed Railway Track Smoothness During Operation Period

The high-speed railway train runs fast,and has the characteristic of good safety and high comfort.There is a need to focus the high smoothness of high-speed railway track.In order to meet the requirement of operation of the high-speed trains,the railway track detection and adjustment are necessary for the uneven railway sections.As now,the measurement of smoothness during the high-speed railway operation is carried out with the method which is the combination of the Railway Inspection Instrument(RII)and the moving track inspection instrument.The latter has the properties of dynamic inspection and speediness,because of its high cost and the dynamic detection result can't be used to guide railway accurate adjustment,and in order to railway maintenance and adjustment,there is a need for the static inspection method which combined the measurement robot and Railway Inspection Instrument and can carries out the smoothness measurement for the railway sections of diseases.The tradition smoothness measurement of RII is carried out with the data acquisition method which is based on rail fastening.Besides,the rail smoothness is evaluated with the method based on rail fastening which is stipulated in high-speed rail specification.The tradition data acquisition method is of low efficiency and inadequacy in limited operation skylight,and the rail smoothness evaluation method which is based on each rail fastening is of heavy calculation workload.These factors seriously restrict the operation and maintenance of high-speed railway.Therefore,how to carry out the efficient measurement and evaluation in limited high-speed operation skylight is a problem needed to be solved imminently.Aiming at these problems,this article studies the following content.Firstly,according to the definition of the smoothness parameters of high-speed railway,based on rigorous law of error propagation,the article derivatives the measurement precision of the railway smoothness parameters and evaluates the measurement precision on the basis of the existing measurement instruments and the realistic condition.The result of evaluation is of certain reference function for the measurement and computation of railway smoothness parameters.Secondly,according to the requirement of the smoothness parameters computation,the article studied the interpolation methods for different line styles for the operation rail data which is not measured by each fastener and has the statistics of the computation precision,and then,carries on comparative analysis and works out the railway measurement data sampling density and interpolation method for the different line types.Besides,based on the traditional algorithm of high-speed railway smoothness parameters,according to the stipulation of high-speed measurement specification and aforesaid railway smoothness measurement method of operation period,this paper studied the calculation and evaluation methods of railway smoothness parameters during operation period.In the end,combined with specific railway measurement data,this paper uses the aforementioned algorithm to calculate the smoothness parameters of the part and analyses the results to verify the correctness of the aforementioned algorithm.