WO2021183080A1 - Method for detection of track leveling errors by vibration measurement from rails - Google Patents

Method for detection of track leveling errors by vibration measurement from rails Download PDF

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Publication number
WO2021183080A1
WO2021183080A1 PCT/TR2021/050199 TR2021050199W WO2021183080A1 WO 2021183080 A1 WO2021183080 A1 WO 2021183080A1 TR 2021050199 W TR2021050199 W TR 2021050199W WO 2021183080 A1 WO2021183080 A1 WO 2021183080A1
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WIPO (PCT)
Prior art keywords
rail
leveling error
vibration
leveling
wheels
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PCT/TR2021/050199
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French (fr)
Inventor
Sabri Haluk GOKMEN
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Gokmen Sabri Haluk
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Publication of WO2021183080A1 publication Critical patent/WO2021183080A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/04—Measuring characteristics of vibrations in solids by using direct conduction to the detector of vibrations which are transverse to direction of propagation
    • G01H1/06—Frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning, or like safety means along the route or between vehicles or vehicle trains
    • B61L23/04—Control, warning, or like safety means along the route or between vehicles or vehicle trains for monitoring the mechanical state of the route
    • B61L23/042—Track changes detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning, or like safety means along the route or between vehicles or vehicle trains
    • B61L23/04—Control, warning, or like safety means along the route or between vehicles or vehicle trains for monitoring the mechanical state of the route
    • B61L23/042—Track changes detection
    • B61L23/047—Track or rail movements

Definitions

  • the invention relates to a method that can be used in the detection of track leveling errors caused by infrastructure deterioration, collapses and deformations in railway track structures.
  • the invention relates to the method of analyzing the mechanical vibration, caused by the vibration waves coming from the wheels on the rails by the movement of the railway vehicle, on the rails with vibration sensors on the rail and thus detecting the leveling errors on the track.
  • Leveling error occurs when the heights of two points on the rail or the difference in height between the points are different from the original reference value.
  • rail road control officers are often used to detect leveling errors caused by the deformation of the rails or the collapse and slippage of the ground where the rail is located. These officers visually inspect the rail, step by step.
  • Another widely used technique is point leveling measurements made at specific time intervals using specially equipped railway measuring vehicles. This technique is far from being an effective method, both because it is expensive and because it cannot be performed frequently on the lines in use. The fact that the railway line is millions of kilometers long all over the world and this process is done with manpower proves that the method is very useless. Again, due to the fact that leveling errors cannot be detected early, major railway accidents occur in the short or medium term and many people die because of this.
  • the aim of the invention is to detect visible and invisible deformities or collapses in the railway track immediately after the leveling error occurs.
  • Another purpose of the invention is to detect the ground defects in the rail and rail line on all lines, especially high-speed railways, when they are at the stage of their formation or when they are just formed and make the necessary warnings before the train reaches the problematic area with this leveling error.
  • Another purpose of the invention is to detect the leveling problems at an early stage and prevent the accident conditions due to leveling error before they occur by allowing the necessary maintenance work to be carried out in advance, thanks to this system used.
  • the aim of the invention is to detect the vibration created by the wheels of the train in motion on the rails by a vibration sensor connected to the rail body, and to detect that a higher, instantaneous and point impact force is applied to the rail from these points due to the disturbance of the rail line elevation at certain points in this data set.
  • the aim of the invention is to analyze the leveling error on the rail and the railway line by the mechanical vibration created by the wheels on the rail while the railway vehicle is in motion with the signal sensors placed on the track and to determine the existence of the problem as a result of the point analysis results verifying each other.
  • the railway vehicle is immediately stopped or speed restricted, if necessary, in order to prevent greater deformation of the ground deterioration in the railway line or the deterioration on the rail, and the necessary repair process is initiated to prevent loss of life and property.
  • Another object of the invention is to include the rail temperature information in the sensing process, thus eliminating the possibility of erroneous results.
  • Another purpose of the invention is to provide convenience in terms of cost and method of use, compared to sensitive sensors, high resolution and fast shooting cameras and similar systems and to eliminate the disadvantages of these systems with its simple structure.
  • the invention which eliminated the negativities in the existing solutions, in the field of railway systems technology, which can be used in the detection of leveling errors that occur as a result of collapse, ground slippage or deterioration in the rail and railway lines on which railway vehicles are traveling; It is a method that detects the vibration created by the wheels of the moving train on the rails by a vibration sensor connected to the rail body and reveals the vibration information related to the leveling error caused by ground and line distortions in this data set.
  • FIGURE 1 The drawing schematically showing the working principle of the method that can be used to detect the leveling error that occurs as a result of the ground and rail line deformations that occur on the track during the movement of the railway vehicle.
  • Vibration Sensor 50 Vibration Waves 60. Track Leveling Error DETAILED DESCRIPTION OF THE INVENTION
  • Figure - 1 a drawing showing schematically the working principle of the method that can be used to detect the leveling errors (60) caused by rail (10) deformity and rail line collapse and deterioration detected from the wheels (30) of the railway vehicles (20) is given.
  • the intensity of the leveling elevation error (60) is calculated from the time axis defined data set, by applying the reverse fft (inverse fast fourier transformation) process to the frequency spectrum data set in the relevant frequency region, and then this value is normalized with the data obtained at a predetermined rail (10) temperature condition from the additional vibrations generated on the rail (10), caused by the leveling error (60) because of the events like under-rail ground discharges or similar track deformation conditions.
  • Each wheel (30) of a high-speed rail vehicle (20) traveling at a speed of 250 km per hour will add a component of 2.8 Hz and 30 Hz to the vibration signal set detected from the rail (10) as it passes over this level impaired point. While this component indicates the leveling error 60 caused by under-rail ground discharges and ground slippage, the amplitude of the signal at these frequencies will also give information about the force applied to the rail (10).
  • Analysis Result-1 a data set recorded in the z-axis of the vibration created by the wheels (BO) of the railway vehicle (20) on a rail (10) without leveling error (60) can be seen.
  • the spectrum image obtained after fft analysis of this data set is given in Analysis Result - 2 below.
  • the vibration created on the rail (10) of a railway vehicle (20) set which is in motion on the line and includes a wheel (30) on this line with a leveling error (60), is measured by the vibration sensor (40).
  • the recorded data set graph appears.
  • Analysis Result -3 In the graph shown in the above Analysis Result -3, the frequency spectrum data set obtained after the fft analysis of this data set is presented in Analysis Result-4 below.
  • This signal which is seen in the lower left corner of the graph in Analysis Result-4 and has peaked around 2.8 Hz and 30 Hz, belongs to the rail (10) with the leveling error (60) that is created by the wheel (30) set of all railway vehicles (20) moving on this rail (10).
  • the leveling error (60) in unilateral collapses in the rail (10) is detected by making a vectoral magnitude comparison of the vibration waves (50) coming from the two opposing wheels (30).
  • unilateral collapses in the rail (10) can also be detected by looking at the vector angles of the vibration waves (50) coming from the two opposing wheels (30) for the leveling error (60).
  • the invention is a method that can be used to detect the leveling error (60), caused by infrastructural deteriorations, collapses and deformations on the rails (10) on which railroad vehicles (20) move and in this methodology, the detection of the mechanical vibration waves (50) generated as a result of the contact of the rail (10) and the wheels (30) while the railway vehicle (20) is in motion on the rails (10), by means of vibration sensors (40) mounted over the rail (10), the detection of additional vibration waves (50), by means of the vibration sensors (40) mounted over the rail (10), generated by the wheels (30) of the railroad vehicle (20) moving on the rail (10) as a result of contact of the rail (10) and the wheels (30) while the railway vehicle (20) passing over the region with the leveling error (60) caused by infrastructural deformations or collapses and deformations of the rails (10), and then merging of the vibration wave (50) signals coming from the wheels (30) passing through the flawless rail (10) line with the vibration wave (50
  • the vibration waves (50) are measured in three axes (x, y, z) in order to analyze the beat angle information of the beat signal within the vibrations created by the wheels (30) moving on the rail (10) in the region with the leveling error (60), by using vibration sensors (40) mounted on the rail (10).
  • the leveling error (60) detection because of the unilateral collapses in the rails (10) are provided by comparing the vibration waves (50) coming from two opposing wheels (30) vectorially or by looking at vector angles.
  • unilateral collapses in the rail (10) can be detected immediately.
  • the determination of the leveling error (60) is achieved by placing the vibration sensors (40) on the body of the rail (10) and measuring the vibration values in three axes (x, y, z) and vectorially gathering the relevant values from the frequency spectrum data obtained at the end of the fft process.
  • the detection of the leveling error (60) is the result of placing the vibration sensors (40) on the body of the rail (10) and measuring the vibration values in three axes (x, y, z) and collecting the relevant values obtained from the frequency spectrum data gathered at the end of the fft process and using these collected values and evaluating the differences that arise as a result of comparing these values with the previous analysis results.
  • Another parameter used in determining the leveling error (60) of the invention It is the use of the speed of the railway vehicle (20) to perform the fft analysis.

Abstract

In the field of rail systems technology, the invention relates to the method that can be used to detect the leveling error (60) caused by infrastructural distortions, collapses and deformations in the railroad vehicle (20) rails (10). In particular, the invention deals with the analysis of the mechanical vibrations generated by the vibration waves (50) coming from the wheels (30) on the rails (10) by the movement of the railway vehicle (20) on the rails (10), with the vibration sensors (40) mounted on the rail (10) for the detection of the leveling errors (60) because of the line collapses, ground washouts and similar infrastructure deformations.

Description

METHOD FOR DETECTION OF TRACK LEVELING ERRORS BY VIBRATION MEASUREMENT
FROM RAILS
TECHNICAL FIELD
In the field of rail systems technology, the invention relates to a method that can be used in the detection of track leveling errors caused by infrastructure deterioration, collapses and deformations in railway track structures.
In particular, the invention relates to the method of analyzing the mechanical vibration, caused by the vibration waves coming from the wheels on the rails by the movement of the railway vehicle, on the rails with vibration sensors on the rail and thus detecting the leveling errors on the track.
PREVIOUS TECHNIQUES
Railway systems in the world are gaining importance day by day because they are fast, economical, environmentally friendly, safe and modern systems. One of the most important features of the rail transportation systems is that they are accepted to be the highest -safety and comfortable public transportation means. Sustaining this feature can be achieved with regular maintenance efforts to these systems. Deformations on the rails or deformations and collapses on the ground on which the rails are positioned are problems that threaten railway safety. At the same time, conditions of the geographical region where the rails are located can cause the rails to collapse or the ground to slide. As such, it becomes even more important to detect deformations on the rail and the ground where it is located and all factors threatening safety. Such negativities in railway tracks cause leveling errors. Leveling error occurs when the heights of two points on the rail or the difference in height between the points are different from the original reference value. In the present technique, rail road control officers are often used to detect leveling errors caused by the deformation of the rails or the collapse and slippage of the ground where the rail is located. These officers visually inspect the rail, step by step. Another widely used technique is point leveling measurements made at specific time intervals using specially equipped railway measuring vehicles. This technique is far from being an effective method, both because it is expensive and because it cannot be performed frequently on the lines in use. The fact that the railway line is millions of kilometers long all over the world and this process is done with manpower proves that the method is very useless. Again, due to the fact that leveling errors cannot be detected early, major railway accidents occur in the short or medium term and many people die because of this.
As a result, in order to eliminate the disadvantages described above, the need for a multi functional, detection system and method with much more secure and various advantages compared to its counterparts and the insufficiency of existing solutions made it necessary to make an improvement in the related technical field.
AIM OF THE INVENTION
The aim of the invention is to detect visible and invisible deformities or collapses in the railway track immediately after the leveling error occurs.
In addition, it will be possible to prevent major rail accidents that may arise, and to use the line more efficiently without restricting the speed, by ensuring that no rail measuring tools are needed while performing this process, and thus, by ensuring the pre-determination of leveling errors on the rails and rail floors on the railway line.
Generally, collapses and deformations occur when the railway vehicle passes and then become apparent or occur at the hottest or coldest moments of the line or according to geographical conditions and weather. Therefore, it is a very important difference to collect and evaluate the leveling error information due to deformation and deterioration. As a result, without waiting for the line to empty, in the case of normal traffic flow, the physical problem should be detected immediately and accidents that may occur should be prevented.
Another purpose of the invention is to detect the ground defects in the rail and rail line on all lines, especially high-speed railways, when they are at the stage of their formation or when they are just formed and make the necessary warnings before the train reaches the problematic area with this leveling error.
Another purpose of the invention is to detect the leveling problems at an early stage and prevent the accident conditions due to leveling error before they occur by allowing the necessary maintenance work to be carried out in advance, thanks to this system used.
The aim of the invention is to detect the vibration created by the wheels of the train in motion on the rails by a vibration sensor connected to the rail body, and to detect that a higher, instantaneous and point impact force is applied to the rail from these points due to the disturbance of the rail line elevation at certain points in this data set.
The aim of the invention is to analyze the leveling error on the rail and the railway line by the mechanical vibration created by the wheels on the rail while the railway vehicle is in motion with the signal sensors placed on the track and to determine the existence of the problem as a result of the point analysis results verifying each other.
In the invention, it is a very important difference to continuously collect and evaluate the leveling error information on the track or rail. As a result, the railway vehicle is immediately stopped or speed restricted, if necessary, in order to prevent greater deformation of the ground deterioration in the railway line or the deterioration on the rail, and the necessary repair process is initiated to prevent loss of life and property.
Another object of the invention is to include the rail temperature information in the sensing process, thus eliminating the possibility of erroneous results. Another purpose of the invention is to provide convenience in terms of cost and method of use, compared to sensitive sensors, high resolution and fast shooting cameras and similar systems and to eliminate the disadvantages of these systems with its simple structure.
In line with the aforementioned purposes, the invention, which eliminated the negativities in the existing solutions, in the field of railway systems technology, which can be used in the detection of leveling errors that occur as a result of collapse, ground slippage or deterioration in the rail and railway lines on which railway vehicles are traveling; It is a method that detects the vibration created by the wheels of the moving train on the rails by a vibration sensor connected to the rail body and reveals the vibration information related to the leveling error caused by ground and line distortions in this data set.
The structural and characteristic features and all advantages of the invention will be understood more clearly thanks to the figures given below and the detailed description written by referring to these figures. Therefore, the evaluation should be made by taking these figures and detailed explanations into consideration.
FIGURES TO HELP UNDERSTAND THE INVENTION
FIGURE 1; The drawing schematically showing the working principle of the method that can be used to detect the leveling error that occurs as a result of the ground and rail line deformations that occur on the track during the movement of the railway vehicle.
REFERENCE NUMBERS 10. Rail
20. Railway Vehicle 30. Wheel
40. Vibration Sensor 50. Vibration Waves 60. Track Leveling Error DETAILED DESCRIPTION OF THE INVENTION
In Figure - 1, a drawing showing schematically the working principle of the method that can be used to detect the leveling errors (60) caused by rail (10) deformity and rail line collapse and deterioration detected from the wheels (30) of the railway vehicles (20) is given.
In the invention, among the frequency data obtained after the fft (fast fourier transformation) analysis of the data sets obtained as a result of sensing the vibrations caused by the wheels (30) of the railway vehicle (20) moving on the rails (10) by the vibration sensors (40) connected to the rails (10) Values such as 3 Hz and 30 Hz are observed. For example, it means that the acoustic data set generated by a railway vehicle (20) traveling on a railway line with a distorted elevation segment at a certain point, at 250 Km / hour speed, gives peak values at these frequencies, because of the uneven, instant forces applied to the rails (10) by the wheels (30). That is, it is observed that these data are additional frequencies that the wheels (30) of the railway vehicle (20) in motion on the track inject into the rails (10) due to the collapses in the track. The fact that this signal is recorded only in certain regions during the movement of the same railway vehicle (20) on the line means that the line in these regions is locally disturbed due to the infrastructure collapsed due to certain reasons. With the vibration sensors (40) mounted on the rails (10) at many points on the line, the evaluation of the data obtained after the frequency analysis of the vibration waves (50) coming from the wheels (30) of the railway vehicles (20) approaching and then moving away from the measurement point on the track, it is revealed that the elevation is impaired.
After the vibration sensor (40) module, which is mounted on the rail (10), catching the vibration waves (50) formed on the rail (10) by the movement of the wheels (30) of the railway vehicle (20) approaching or moving away from this point, performs an fft (fast fourier transformation) analysis on the data set obtained during this sensing operation and as a result of the evaluation of this frequency domain data analysis the resultant data reveals in which regions of the railway line ground elevation is impaired. Then, the intensity of the leveling elevation error (60) is calculated from the time axis defined data set, by applying the reverse fft (inverse fast fourier transformation) process to the frequency spectrum data set in the relevant frequency region, and then this value is normalized with the data obtained at a predetermined rail (10) temperature condition from the additional vibrations generated on the rail (10), caused by the leveling error (60) because of the events like under-rail ground discharges or similar track deformation conditions.
In order to understand the invention better, the following example has been deemed suitable as an example: Each wheel (30) of a high-speed rail vehicle (20) traveling at a speed of 250 km per hour will add a component of 2.8 Hz and 30 Hz to the vibration signal set detected from the rail (10) as it passes over this level impaired point. While this component indicates the leveling error 60 caused by under-rail ground discharges and ground slippage, the amplitude of the signal at these frequencies will also give information about the force applied to the rail (10).
Figure imgf000008_0001
Analysis Result -1
In Analysis Result-1, a data set recorded in the z-axis of the vibration created by the wheels (BO) of the railway vehicle (20) on a rail (10) without leveling error (60) can be seen. The spectrum image obtained after fft analysis of this data set is given in Analysis Result - 2 below.
Figure imgf000009_0001
Analysis Result -2
Above, in Analysis Result-2, there is a main component around 1700 Hz in the frequency spectrum image, and this component is a basic frequency component of the vibration created by the wheels (30) of the railway vehicle (20) on a rail (10) without leveling error (60).
In the Analysis Result-3 below, the vibration created on the rail (10) of a railway vehicle (20) set, which is in motion on the line and includes a wheel (30) on this line with a leveling error (60), is measured by the vibration sensor (40). The recorded data set graph appears.
Figure imgf000009_0002
Analysis Result -3 In the graph shown in the above Analysis Result -3, the frequency spectrum data set obtained after the fft analysis of this data set is presented in Analysis Result-4 below.
Figure imgf000010_0001
Analysis Result -4
This signal, which is seen in the lower left corner of the graph in Analysis Result-4 and has peaked around 2.8 Hz and 30 Hz, belongs to the rail (10) with the leveling error (60) that is created by the wheel (30) set of all railway vehicles (20) moving on this rail (10). The value obtained as a result of vectorial summation of continuous measurements in three axes of this signal received on the rail (10) by the vibration sensor (40) which is positioned on the rail (10), determines the presence and angle of the leveling error (60).
In determining this leveling error induced pulse intensity, the data set of this signal region, which is seen in the lower left corner of the graph in Analysis Result-4 and formed peaks between 2.8 - 30 Hz, is shown in Analysis result-5. The amplitude level in this data set obtained after the reverse fft process is used to determine the intensity of the leveling error (60) level.
Figure imgf000011_0001
Analysis Result -5
While the presence of this signal indicates the leveling error (60) caused by under-rail discharges and ground slippage, the intensity of the signal will be proportional to the strength of the leveling error (60) on the rail (10). After calculating the leveling error (60) signal obtained from the rail (10) with the temperature of the rail (10), it will be possible to calculate the force resulting from the leveling error (60) quite real. It will be possible to convert this leveling error (60) data into a sensitive dataset both qualitatively and quantitively after correlating the variation of the vibration signal with the variation of the rail (10) temperature with a regression analysis based artificial intelligence algorithm.
In the present invention, it is ensured that the leveling error (60) in unilateral collapses in the rail (10) is detected by making a vectoral magnitude comparison of the vibration waves (50) coming from the two opposing wheels (30). Likewise, unilateral collapses in the rail (10) can also be detected by looking at the vector angles of the vibration waves (50) coming from the two opposing wheels (30) for the leveling error (60).
In summary, in the field of rail systems technology, the invention is a method that can be used to detect the leveling error (60), caused by infrastructural deteriorations, collapses and deformations on the rails (10) on which railroad vehicles (20) move and in this methodology, the detection of the mechanical vibration waves (50) generated as a result of the contact of the rail (10) and the wheels (30) while the railway vehicle (20) is in motion on the rails (10), by means of vibration sensors (40) mounted over the rail (10), the detection of additional vibration waves (50), by means of the vibration sensors (40) mounted over the rail (10), generated by the wheels (30) of the railroad vehicle (20) moving on the rail (10) as a result of contact of the rail (10) and the wheels (30) while the railway vehicle (20) passing over the region with the leveling error (60) caused by infrastructural deformations or collapses and deformations of the rails (10), and then merging of the vibration wave (50) signals coming from the wheels (30) passing through the flawless rail (10) line with the vibration wave (50) signals originating from the wheels (30) passing through the rail (10) line with the leveling error (60), are followed by the process steps to transfer the data set resulting from the merger to the frequency domain using the fft (fast fourier transformation) analysis method, and determined the region with leveling error (60) on the rail track (10) from the obtained frequency spectrum data set. In the invention, for the detection of the leveling error (60), the vibration waves (50) are measured in three axes (x, y, z) in order to analyze the beat angle information of the beat signal within the vibrations created by the wheels (30) moving on the rail (10) in the region with the leveling error (60), by using vibration sensors (40) mounted on the rail (10). Again, the leveling error (60) detection because of the unilateral collapses in the rails (10) are provided by comparing the vibration waves (50) coming from two opposing wheels (30) vectorially or by looking at vector angles. Thus, unilateral collapses in the rail (10) can be detected immediately.
In the invention, the determination of the leveling error (60) is achieved by placing the vibration sensors (40) on the body of the rail (10) and measuring the vibration values in three axes (x, y, z) and vectorially gathering the relevant values from the frequency spectrum data obtained at the end of the fft process. In the invention, again, the detection of the leveling error (60) is the result of placing the vibration sensors (40) on the body of the rail (10) and measuring the vibration values in three axes (x, y, z) and collecting the relevant values obtained from the frequency spectrum data gathered at the end of the fft process and using these collected values and evaluating the differences that arise as a result of comparing these values with the previous analysis results. Another parameter used in determining the leveling error (60) of the invention; It is the use of the speed of the railway vehicle (20) to perform the fft analysis.

Claims

CLAIMS l. The invention, in the field of rail systems technology, is a method that can be used to detect the leveling error (60) caused by infrastructural deteriorations, collapses and deformations in the rails (10) used by the railroad vehicles (20) and characterized with the following features in order of process;
• the railway vehicle (20) moves on the rails (10),
• detecting the mechanical vibration waves (50) arising from the contact of the rail (10) with the wheels (30) while the railway vehicle (20) is in motion, by vibration sensors (40) on the rail (10),
• the passing of the wheels (30) of the railway vehicle (20) on the rail (10) from the region with the leveling error (60) resulting from deformation, deterioration or collapse,
• detecting the additional vibrations created by the leveling error (60) on the rail (10) with vibration sensors (40) on the rail (10),
• the combination of the vibration wave (50) signals coming from the wheels (30) passing through the flawless rail (10) line with the vibration wave (50) signals originating from the wheels (30) passing through the rail (10) line with the leveling error (60),
• transferring the data set resulting from the merger into the frequency domain using the fft (fast fourier transformation) analysis method,
• ensuring the detection of the region with leveling error (60) on the rail track (10) from the frequency spectrum data set obtained,
2- It is a method that can be used to detect the leveling error (60) in accordance with Claim-1, and it is characterized by the feature; By using vibration sensors (40) to measure the vibration waves (50) in three axes (x, y, z) in order to analyze the pulse angle information of the pulse signal within the vibrations created by the wheels (30) on the rail (10) in the region with leveling error (60).
3- It is a method that can be used to detect the leveling error (60) in accordance with Claim-1, and its feature; the collapses in only one rail (10) are also characterized by determining the leveling error (60) by making a vectoral comparison of the vibration waves (50) coming from the two opposing wheels (30).
4- It is a method that can be used to detect the leveling error (60) in accordance with Claim-1, and its feature; It is characterized in that the leveling error (60) because of the collapses in only one rail (10) is determined by looking at the vector angles of the vibration waves (50) coming from the two opposing wheels (30).
5- It is a method that can be used to detect the leveling error (60) in accordance with Claim-1, and it is characterized by the feature; The determination of the leveling error (60) is obtained as a result of placing the vibration sensors (40) on the body of the rail (10) and measuring the vibration values in three axes (x, y, z) and vectorial summation of these relevant values taken from the frequency spectrum data obtained at the end of the fft process.
6- It is a method that can be used to detect the leveling error (60) in accordance with Claim-1, and it is characterized by the feature; The determination of the leveling error (60) is obtained as a result of placing the vibration sensors (40) on the body of the rail (10) and measuring the vibration values in three axes (x, y, z) and vectorial summation of these relevant values taken from the frequency spectrum data obtained at the end of the fft process and by using these values and evaluating the differences that arise as a result of comparing these values with the past analysis result values.
7- It is a method that can be used to detect the leveling error (60) in accordance with claim-1, and it is characterized by the feature; In determining the leveling error (60); the speed of the railway vehicle (20) is utilized to perform the fft analysis.
PCT/TR2021/050199 2020-03-09 2021-03-08 Method for detection of track leveling errors by vibration measurement from rails WO2021183080A1 (en)

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WO2018048308A1 (en) * 2016-09-07 2018-03-15 Stiftelsen Norsar A railway track condition monitoring system for detecting a partial or complete disruption of a rail of the railway track
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