Method for detecting irregularity of medium-low-speed magnetic suspension track based on four sensors

Abstract

The invention relates to a method for detecting irregularity of a medium-low-speed magnetic suspension track based on four sensors. The method comprises the following steps: (1) successively arranging four gap sensors on a suspension frame along a track moving direction; (2) building a reference coordinate system; (3) obtaining coordinates of four gap measuring points relative to the suspension frame according to gap values measured by the gap sensors and the arrangement positions of the gap sensors; and (4) fitting via a least square method to obtain first fitting straight lines of the four gap measuring points at the same moment according to the coordinates of the four gap measuring points relative to the suspension frame, and obtaining four-point straightness of the position of the medium-low-speed magnetic suspension track at current moment according to deviation values between the four gap measuring points and the corresponding first fitting straight lines. Compared with the prior art, train suspension control equipment is fully used; through suspension control sensors, the irregularity content such as straightness, dislocation. folded angles and the like of the magnetic suspension track can be efficiently and accurately detected by taking a suspension magnet module as a ruler.

Description

technical field [0001] The invention relates to a track detection technology of a medium-low speed maglev system, in particular to a method for detecting irregularity of a medium-low speed maglev track based on four sensors. Background technique [0002] As a new type of rail transit system, medium and low-speed maglev transportation has the advantages of flexible line selection, small turning radius, and strong climbing ability. Currently, medium and low speed maglevs are under construction in Beijing, Changsha and other cities. Because the F-shaped track of medium and low speed maglev is different from the I-shaped track of traditional rail transit, the traditional rail transit track detection equipment cannot meet the requirements of medium and low speed maglev track detection. In addition, the track measurement method used in the construction acceptance stage generally takes a long time, and it is difficult to meet the rapid detection or monitoring requirements in the o...

AI Technical Summary

Problems solved by technology

Among them, the track detection system of the inertial reference method includes the track beam functional surface long-wave detection system (GMS system) used on the Shanghai maglev demonstration line, the medium and low speed maglev F rail geometric parameter measurement system (FMS01 system) of the National University of Defense Technology, and the Southwest Jiaotong University The low-speed maglev track irregularity detection method based on dual sensors, etc., adopts the inertial reference method, and the measurement error is large when the speed is low. In addition, the quality of the acceleration signal and the phase error caused by filtering also cause certain errors to the entire track detection system. The track detection system based on the chord measurement method includes the medium and low speed maglev portable track detection system of Central South University. Increased, and there is no comparison with the static measurement data, lack of verification; the track detection method combined with the static measurement includes the line track automatic detection equipment (AIE system) on the Shanghai maglev demonstration line, and the track geometry measurement of the medium and low speed maglev in South Korea system, etc., the track detection method combined with static measurement is equivalent to a simplification of geodetic survey, which improves the efficiency of geodetic survey

However, the detection speed is still slow, and it is difficult to meet the needs of rapid monitoring and evaluation of the track after the line is put into operation.

[0007] In the field of medium and low speed maglev, the existing track detection methods are all based on special track detection equipment, which is difficult to run simultaneously during the train operation

In addition, on the one hand, the existing track detection methods are partly based on the inertial reference method, and it has been verified that there are large errors when the train running speed is low

On the other hand, for the track detection equipment based on the string measurement method, the hand-push quasi-static measurement is mainly used, and the detection efficiency is low

Images