Rapid Detection Method for Rail Corrugation in High-speed Railways Based on Corrugation-noise Ratio
To achieve full coverage,high-frequency,and rapid measurement of rail corrugation in high-speed railways,a fast detection method was proposed for rail corrugation based on corrugation-noise ratio.A portable ride recorder was used to detect the vehicle vibration and noise data of high-speed trains,and perform numerical integration on the longitu-dinal acceleration of the vehicle body to preliminarily calculate the train speed and mileage.The deviation value was used between the angular velocity mileage of the body shaking in curved sections and the ledger mileage to correct the speed integration error.Based on the extracted carriage noise data after mileage correction and the 400~700 Hz frequency band components corresponding to rail corrugation,the ratio of frequency band energy to total noise energy was calculated to obtain the rail corrugation wavelength and mileage when the corrugation-noise ratio exceeded the limit.Based on the a-nalysis of measured data of high-speed trains,the research results show that the maximum error in train positioning mile-age after speed correction is 87 m.According to the measurement of rail corrugation waveform and analysis of axle box acceleration vibration energy ratio carried out on the line sections with a corrugation ratio exceeding 0.3,the wavelength range of rail corrugation is 53~57 mm,while the measured wavelength on site is 53 mm.This method has been verified to provide technical support for the rapid measurement of rail corrugation in high-speed railways.
rail corrugationcorrugation-noise ratiospeed estimationmileage positioningvibration energy ratio