Track profile detection method, system and device

The invention provides a rail profile detection method, system and device. The method comprises the following steps: acquiring a transverse acceleration curve of a bogie frame when a rail vehicle passes through a section rail; the transverse acceleration curve is subjected to band-pass filtering, a filtered curve is obtained, and the upper limit and the lower limit of the frequency range of band-pass filtering are determined based on the secondary snaking instability frequency of the railway vehicle; and based on the filtered curve, judging whether the track profile is bad or not. By acquiring the transverse acceleration curve of the framework, analyzing after band-pass filtering, the condition that the profile of the track is poor can be recognized, online real-time detection of the track can be achieved by implementing the detection method on the track vehicle, the in-transit detection efficiency is high, and state repair and accurate maintenance of the track can be achieved if the number of the detected ve