Apparatus and method for calculating wooden crosstie plate cut measurements and rail seat abrasion measurements based on rail head height

• US 10,625,760 B2
• Filed: 09/11/2018
• Issued: 04/21/2020
• Est. Priority Date: 06/01/2018
• Status: Active Grant

• Current Assignee: Tetra Tech Incorporated
• Original Assignee: Tetra Tech Incorporated
• Inventors: Mesher, Darel
• Primary Examiner(s): Barbee, Manuel L
• Application Number:
  US16/127,956
• Publication Number:
  US 20190367060A1
• Time in Patent Office: 588 Days
• CPC Class Codes: B61K 9/08 Measuring installations for surveying permanent way applications of measuring apparatus or devices for track building purposes E01B35/00; measuring techniques G01
• CPC Class Codes: B61K 9/10 for detecting cracks in rails or welds thereof
• CPC Class Codes: B61L 2205/04 Satellite based navigation systems, e.g. global positioning system [GPS]
• CPC Class Codes: B61L 23/045 Rail wear
• CPC Class Codes: B61L 23/048 Road bed changes, e.g. road bed erosion
• CPC Class Codes: G01S 17/88 Lidar systems specially adapted for specific applications
• CPC Class Codes: G01S 19/13 Receivers
• CPC Class Codes: G01S 19/45 by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
• CPC Class Codes: G01S 19/48 by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system

Abstract

A system and method for inspecting a railway track. The system preferably includes: a processor; at least one sensor oriented to capture data of the railway track; a data storage device in electronic communication with the processor; and computer executable instructions stored on a computer readable storage medium in communication with the processor operable to: determine an elevation of a surface of a rail head of a rail located on the railway track based on a distance to the rail head from the at least one sensor, determine an elevation of a surface of a crosstie of the railway track based on a distance to a top surface of the crosstie from the at least one sensor, estimate a total rail height and underlying rail support, and calculate a crosstie wear value based on the determined rail head surface elevation, crosstie surface elevation, and estimated total rail height and underlying rail support.

Claims

1. A system for inspecting a railway track, the system comprising:

a processor;

at least one sensor oriented to capture data of the railway track and mountable on a rail vehicle for moving the at least one sensor along the railway track, the at least one sensor in electronic communication with the processor;

a data storage device in electronic communication with the processor; and

computer executable instructions stored on a computer readable storage medium in communication with the processor operable to;

determine an elevation of a surface of a rail head of a rail located on the railway track based on a distance to the rail head from the at least one sensor;

determine an elevation of a surface of a crosstie of the railway track based on a distance to a top surface of the crosstie from the at least one sensor;

estimate a total rail height of the rail and underlying rail support height of an underlying rail support; and

calculate a crosstie wear value based on the determined rail head surface elevation, crosstie surface elevation, and estimated total rail height and underlying rail support height;

wherein the crosstie wear value is calculated without requiring the at least one sensor to capture data from which a surface elevation of the underlying rail support can be directly measured.

2. The system for inspecting a railway track of claim 1, wherein the at least one sensor is located on a rail vehicle, the system for inspecting a railway track further comprising an encoder located adjacent a wheel of the rail vehicle and in communication with the processor to provide location data of the rail vehicle.

3. The system for inspecting a railway track of claim 1, the at least one sensor further comprising a light emitter and a camera in communication with the processor, wherein the camera captures a field of view of the railway track including reflected light from the light emitter to generate a three-dimensional elevation map of the railway track.

4. The system for inspecting a railway track of claim 1, wherein the at least one sensor comprises a time of flight sensor.

5. The system for inspecting a railway track of claim 1, further comprising a GPS antenna in communication with the processor for detecting a location of the system.

6. The system for inspecting a railway track of claim 1, wherein the one or more sensors comprise at least one camera and associated light emitter and at least one time of flight sensor.

7. A method of determining wear of a railway track, the method comprising:

interrogating a railway track using at least one sensor which forms part of a track assessment system housed on a rail vehicle for moving the at least one sensor along the railway track;

receiving data corresponding to the railway track from the interrogation of the railway track using the at least one sensor;

determining an elevation of a rail head of the railway track based on the received data;

determining an elevation of a top surface of a rail crosstie of the railway track based on the received data;

estimating a total rail height of a rail of the railway track and a height of an underlying rail support;

determining a crosstie wear value based on the elevation of the rail head, the elevation of the top surface of the crosstie, the estimated total rail height, and the estimated height of the underlying rail support;

wherein the crosstie wear value is calculated without requiring the at least one sensor to capture data from which a surface elevation of the underlying rail support can be directly measured.

8. The method of claim 7, wherein the estimated total rail height is determined based on one or more visual indicators displayed on the rail which are visually captured by the at least one sensor and compared by the processor to a database of rail markings used by the manufacturer of the rail.

9. The method of claim 7, further comprising determining a geographic location of one or more railway track features corresponding to the data captured on the at least one sensor, wherein the estimated total rail height is determined based on the geographic location of the one or more railway track features.

10. The method of claim 9, further comprising the step of determining an estimated total rail height by using the processor to access a database which includes data which correlates specific geographic track locations to the identities of the specific types of rails placed at those geographic track locations.

11. The method of claim 7, wherein the underlying rail support comprises a tie plate and the step of estimating a total rail height of a rail of the railway track and a height of an underlying rail support further comprises estimating a thickness of the tie plate.

12. The method of claim 11, further comprising estimating a thickness of the tie plate based on received data at a plurality of locations along a length of track, wherein the estimated tie plate thickness is determined based on a maximum distance from the top surface of the rail head to the top surface of the crosstie along the length of track.

13. The method of claim 11, wherein the rail wear value is a plate cut value corresponding to an amount that the tie plate has cut into a top surface of the crosstie.

14. The method of claim 7, wherein the crosstie is a concrete crosstie, and wherein the rail wear value is a rail seat abrasion value corresponding to an amount that a rail base seat has cut into a top surface of the concrete crosstie.

15. The method of claim 7 wherein the underlying rail support comprises a pad, wherein the crosstie is a concrete crosstie, and wherein the step of estimating a total rail height of a rail of the railway track and a height of an underlying rail support further comprises estimating a thickness of the pad.

16. The method of claim 15, further comprising estimating a thickness of the pad based on received data at a plurality of locations along a length of track, wherein the estimated pad thickness is determined based on a maximum distance from the top surface of the rail head to the top surface of the crosstie along the length of track.