Study On Portable Track Geometry Detection System

When engineering depot workers finished the line maintenance, they use the manual line-pulling method to verify whether the tracks after maintenance meet the requirements. With the improvement of the railway running speed, skylight time is getting shorter and shorter for the line maintenance used by engineering depot workers, so the original manual detection methods cannot meet the requirements of line inspection. The portable track detection trolleys can significantly improve the detection efficiency of the railway workers and reduce labor intensity. Therefore, using the portable track detection trolleys for line routine detection becomes the trend of line maintenance.According to the Railway Ministry line maintenance rules and portable track inspection equipment design specifications, a track geometry parameter measurement scheme based on the principle of inertial reference is proposed, which is designed for a portable track geometry detection system. Depending on GJ-5-type track integrated detection system as the prototype, system separates suspension beam and evaluates the prototype to get the portable track inspection trolley model. Portable track geometry detection system using hand-push trolley as the main structure, installs displacement meter, accelerometer, fiber optic gyroscope and rotary encoder to measure body posture information and calculate track geometry parameters. Through the Kalman filter algorithm used for the track geometry parameters, signal is imported into the real-time computing model. System can store and display track geometric irregularity data in the current position.In order to verify the stability and reliability of the portable track geometry inspection system, a standard track platform is built in the experimental environment for testing. The experimental results show that the system can effectively detect the track condition and truly reflect the rail irregularity information. The track geometry sampling interval is0.254mm and the parameter accuracy is less than±1mm when the inspection trolley operates at the speed of1.2-1.5m/s. Because the inspecting length is short and test environment is different from the real environment, repeated measurements in large distance are expected to verify the experiment data.