Non-contact sleeper identification method in moving state

Abstract

The invention discloses a non-contact sleeper identification method in a low-speed moving state, which can effectively improve the accuracy and precision of sleeper identification, rapidly detect thegeometrical state of the track, and prevent incorrect detection and missing detection of the sleeper. The non-contact sleeper identification method comprises the steps: fixedly arranging a laser sensor on the bottom surface of a main beam of a dynamic measuring trolley, wherein the emitting surface of the laser sensor is co-planar with the bottom surface of the main beam of the trolley, and the laser aiming line is aligned with a rail base or sleeper; pushing the dynamic measuring trolley according to a measuring path for enabling the laser sensor to scan the sleeper and a ballast bed below the laser sensor for measuring the distance between the laser sensor and the sleeper as well as the distance between the laser sensor and the ballast bed, and recording the acquired original data; matching the laser sensor with a speedometer to draw an original oscillograph, wherein the transverse direction of the original oscillograph stands for mileage, and the longitudinal direction of the original oscillograph stands for the distance between the laser sensor and the sleeper as well as the distance between the laser sensor and the ballast bed acquired by the laser sensor; performing data filtering on the original oscillograph for removing high-frequency signals to obtain a smooth oscillograph; measuring waveforms to obtain distance between adjacent wave crests t1 and wave crest width t2;and performing automatic identification on the sleeper by taking the distance between two adjacent wave crests t1 and the wave crest width t2 as constraint conditions.

Description

technical field [0001] The invention relates to rail transportation, in particular to a non-contact sleeper identification method in a low-speed moving state. Background technique [0002] The rapid detection technology of railway track geometric state is the development trend of railway track geometric state detection, and the dynamic track inspection trolley (abbreviated as dynamic inspection trolley) developed at home and abroad is the carrier of this technology. The motion inspection trolley integrates various sensors such as wireless communication, sleeper recognition, inertial navigation system, distance measurement, angle measurement, etc., and the sleeper recognizer is an important part of the motion inspection trolley. Its detection accuracy directly reflects the quality and quality of track detection. Accuracy, when a sleeper is missed or wrongly detected, it will directly affect the accuracy of all subsequent data detection and the detection quality of the entire ...

AI Technical Summary

Problems solved by technology

The proximity switch is a position switch that generates a switch pulse signal without direct contact with moving parts. It can sense the presence of metal. When the proximity switch is close to the metal, it will generate a switch signal. The system judges whether the position exists according to the switch signal. Sleeper, because the proximity switch can only detect metal, so this method can only realize the identification of the sleeper by detecting the existence of the spike, and the sleeper identification cannot be realized when the spike is lost, leaked or wrongly installed. In addition, due to the proximity switch The measuring range is short, the maximum is 4cm. Therefore, when installing, the distance between the proximity switch and the spike should be less than 4cm, while the distance between the base of the motion detection trolley and the spike exceeds 4cm. To detect the sleeper, the proximity switch must be extended. In this way, the proximity switch cannot be avoided from colliding with other objects, resulting in damage to the proximity switch or deviation of the installation position, thus making the proximity switch unable to work normally

Ultrasonic sensors use sound waves to detect sleepers. Ultrasonic waves can achieve long-distance measurement. Therefore, it is not necessary to install ultrasonic sensors outside the base of the motion inspection trolley during installation. However, ultrasonic waves have slow propagation speeds, small beam angles, and slow sensing speeds. Disadvantage, when the speed of the motion detection car is relatively fast, it is easy to cause missing data detection

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