Track Geometry Measurement

GJY-H-CK-22CM track geometry dimension inspection equipment (track geometry measurement) is developed based on the principle of “chord measurement method”, integrating high-precision dynamic inclination sensors, displacement sensors, fiber optic gyroscopes and other precision sensors. The hardware acquisition module samples the data of each sensor every 0.125 meters and uploads it to the PC software for real-time data processing and calculation, effectively ensuring the accuracy of the data.

The structure of the H-type track geometry measurement system consists of four main parts: measuring arm, auxiliary walking arm, measuring spindle (connecting arm), and industrial PC.

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GJY-H-CK-22CM Track Geometry Measurement

Driven by an electric flaw detection vehicle, the track geometry measurement system runs at a maximum speed of 15km/h while conducting geometric dimension inspection of the double rail track. The testing items include: track gauge, left and right track direction, left and right height, cant (superelevation), twist, gauge change rate, left and right versine, rail wear, and mileage error less than 1 m/km. It has fast detection speed, high accuracy, online analysis and processing, diversified report output, and easy software operation.

Meet accuracy requirement of Level I track geometry measurement system:

Measurement Items	Scale	Technical Requirement		Remark
Gauge	1410-1485mm	Zero point accuracy	±0.15mm	Applicable for static measurement
		Indication error	±0.5mm	Applicable for track line measurement
		Repeatability	±0.375mm	Applicable for track line measurement
Gauge change rate		Max. tolerance	±0.03%	Applicable for track line measurement
Gauge change rate		Repeatability	≤0.045%	Applicable for track line measurement
Cant (superelevation)	±225mm	Max. tolerance	±0.5mm	Applicable for static or track line
		Turning error	≤0.3mm	Applicable for static measurement
		Repeatability	≤0.375mm	Applicable for track line
Twist		Max. tolerance	±0.7mm	Applicable for track line
Twist		Repeatability	≤0.5mm	Applicable for track line
Rail height and direction	±100mm	Max. tolerance	±1mm	Applicable for track line
Rail height and direction	±100mm	Repeatability	≤0.75mm	Applicable for track line
Versine	±400mm	Max. tolerance	±1mm	Applicable for track line
Versine	±400mm	Repeatability	≤0.75mm	Applicable for track line
Rail wear	Vignole, grooved rails		±0.3mm	Applicable for track line

The software provides a graphical interface for real-time observation of the curve changes and numerical display of various detection parameters, provides over limit alarm, and supports data playback, parameter configuration, image scaling, movement, report exporting and other functions, making the operation easy and simple.

Job inspection interface

Data playback interface

The software provides various report formats, including over limit reports, TQI reports, summary reports, kilometer summary reports, curve reports, defect reports, etc. The following are some examples of these reports.

Over limit report

TQI Report

For the convenience of users in conducting repetitive analysis of data, the software provides CSV format for the generated data, which can be opened using tools such as Excel for comparative analysis of multiple sets of data. The following is an example for comparison of the consistency of three actual test data (including round trip):

Gauge

Cant

Twist (6.25m basic length)

Versine

The repeatability of cant and twist reached 98.6%, and the repeatability of other detection parameters reached over 99%, meeting the requirements of various indicators for Level I track geometry measurement system.

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Track Geometry Measurement