Method and system for measuring geometric parameters of track overhead line system

Abstract

The invention relates to the technical field of track catenary parameter measurement, in particular to a track catenary geometric parameter measurement method and system.The measuring instrument is placed on a steel rail, the C end is the instrument fixed end, the D end is the instrument movable end, the O point is the CD midpoint, namely the track center point, the B point is the laser emission point, and the A point is the measured point; the measuring instrument is initialized through the initialization calibration APP tool; reading and writing of basic information such as equipment serial numbers, CF lengths and BF lengths are provided, the CF lengths and the BF lengths are fixed by structures and cannot be changed in actual measurement and use, and numerical value writing needs to be carried out once before use; and after dynamic laser calibration, rail width laser calibration, gyroscope calibration, magnetic encoder calibration and initialization verification of various information parameters are completed, measurement is carried out.

Description

Technical Field

[0001] The invention relates to the technical field of track contact network parameter measurement, and in particular to a track contact network geometric parameter measurement method and system. Background Art

[0002] The overhead contact network system is an important part of the traction power supply system of high-speed railways and urban rail transit, responsible for transmitting the power output from the traction substation to the EMU. During the operation of the EMU, there are usually complex mechanical and electrical interactions between the pantograph and the overhead contact network, which will cause wear of the contact line, resulting in changes in the pull-out value and the height of the conductor. In severe cases, it may cause defects such as damage, loosening, and breakage of the components of the overhead contact network support device, resulting in a decrease in the stability of the mechanical structure of the overhead contact network. In severe cases, it may cause serious safety accidents, such as the detachment of the positioner and the collapse of the overhead contact network, which directly affect the safe operation of the train. Therefore, accurate and efficient data measurement of the overhead contact network is of great significance to the operation and maintenance of urban rail transit and high-speed railways.

[0003] With the introduction of the 6C detection system for high-speed railways, image-based non-contact detection methods are increasingly replacing traditional manual line inspections and becoming the main means of overhead line inspection and maintenance and are being adopted by various units. However, the existing measurement system still has problems such as poor portability of measuring instruments, insufficient measurement data accuracy, excessive reliance on manual assistance, and low degree of automation, resulting in low detection efficiency.

[0004] In response to the above problems, a rail contact network geometric parameter measurement method and corresponding system that is easy to carry, simple to use, and has high measurement accuracy has been designed. The system can quickly and accurately trace the track parameters and contact network parameters, and provide a basic guarantee for the quality and efficiency of rail line and contact network operation, maintenance and overhaul. This has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for measuring geometric parameters of a track contact network. A measuring instrument is placed on a rail, end C is a fixed end of the instrument, end D is a movable end of the instrument, point O is the midpoint of CD, i.e., the center point of the track, point B is a laser emission point, and point A is a measured point. S1. Initialize the measuring instrument through the initialization calibration APP tool; S2, provides reading and writing of basic information such as device serial number, CF length, BF length, etc. The CF length and BF length are fixed by the structure and will not change during actual measurement and use. The value needs to be written once before use; S3. Dynamic laser calibration: The object to be measured is placed at the selected standard distance. If the measurement result is different from the standard distance, you need to enter the selected standard distance value in the "reference value" of the corresponding item of the initialization calibration APP tool for calibration, and then adjust the object to the new selected standard distance. Repeat the above operation for verification. If the verification is correct, the calibration is completed; S4. Rail width laser calibration: Fix the measuring instrument on the preset standard rail. If the measurement result is different from the standard rail width, enter the standard length in the "reference value" of the corresponding item in the initialization calibration APP tool for calibration. Then adjust the movable end of the measuring instrument and place it on another preset standard rail for verification. If the verification is correct, the calibration is completed. S5. Gyroscope calibration: Place the measuring instrument on a standard horizontal table, and enter 0° in the "reference value" of the corresponding item in the initialization calibration APP tool for calibration; S6, magnetic encoder: measure and calibrate the magnetic encoder module of the measuring instrument from 0°, 45°, 90°, and 180° in sequence. After verification, the calibration is completed. After the initialization and verification of various information parameters are completed, measurement can be carried out.

[0006] Preferably, the numerical algorithm for the distance OA between the track midpoint and the contact network is: The fixed values ​​are CF length, BF length, and the measured values ​​AB length, CD length, and the measured angle ∠HBA, the tilt angle of the gyroscope, S1. Calculate ∠ABG. When ∠HBA is greater than or equal to 0° and less than 180°, ∠ABG = 180°-∠HBA; when ∠HBA is greater than 180° and less than or equal to 360°, ∠ABG = 540°-∠HBA. S2. Calculate ∠GBO, FO = CF - (CD / 2); in the right triangle BOF, the Pythagorean theorem: BO = square root (BF² + FO²), tangent function: ∠BOF = arctan(BF / FO), because the alternate angles of parallel lines are equal, so ∠GBO = ∠BOF; S3. Calculate ∠ABO. When ∠HBA is greater than or equal to 0° and less than 180°, ∠ABO = ∠ABG + ∠GBO; when ∠HBA is greater than 180° and less than or equal to 360°, ∠ABO = |360°-(∠ABG + ∠GBO)|; S4. The calculation result OA is formed. In the triangle ABO, the cosine theorem OA = square root (AB²+OB²-2*AB*OB*cos(∠ABO)).

[0007] Preferably, the OA' algorithm for the height of the contact wire is: the height of the contact wire is the vertical length of the contact wire point relative to the rail surface. S1. Calculate ∠AOB: In triangle ABO, according to the law of cosines, ∠AOB = arccos( (OA²+OB²-AB²) / 2*OA*OB ); S2. Calculate ∠AOC: ∠AOC = 180-(∠AOB+∠BOF); Calculate the height OA': Because the alternate angles of parallel lines are equal, ∠A'AO = ∠AOD, and according to the law of sine, OA' = sin(∠A'AO)*OA.

[0008] Preferably, the pull-out value SA algorithm, the pull-out value is the length of the contact point from the pantograph center, the above algorithm data ∠AOC is reused, and ∠AOS = ∠AOC-90° is calculated; In triangle ASO, according to the sine function, SA=sin(∠AOS-90)*OA, the calculated value of SA has positive and negative values. When the calculated value of SA is negative, ∠AOC is less than 90°. At this time, the contact point is on the other side of point B with respect to the central axis of OS. When the calculated value of SA is a positive value, the contact point is on the same side as point B with respect to the central axis of OS.

[0009] Preferably, the side limit value OA' algorithm of the pillar, the side limit of the pillar refers to the safe distance OA' set from the side of the pillar close to the line to the center line of the line in order to ensure the safety of driving. The operator uses the level ruler on the measuring instrument to judge and adjust so that BA remains level; Calculate ∠AOA'. If ∠AOC is greater than 90°, ∠AOA' = |180-∠AOC-|∠A'OC||; if it is less than 90°, ∠AOA' = |∠AOC-|∠A'OC||; calculate OA': OA' = sin(90°-∠AOA')*OA.

[0010] Preferably, a track contact network geometric parameter measurement system, based on the aforementioned track contact network geometric parameter measurement method, comprises a measuring instrument, an initialization calibration APP, a measurement APP, a track contact network geometric parameter measurement device management system and a built-in sensor component of the measuring instrument, The measuring instrument is used to collect data from the built-in sensor component and transmit it to the initialization calibration APP and the measurement APP via wireless WIFI. The initialization and calibration APP is used to initialize the parameters of the measuring instrument and calibrate the sensor components. The measurement APP is used to obtain the sensor component data and calculate in real time the geometric parameters such as the distance between the center of the contact network and the rail surface, the height of the guide, the pull-out value, etc., and can generate a measurement report. The rail contact network geometric parameter measuring device management system provides the functions of downloading the measurement APP and the initialization calibration APP, registering the factory information of the measuring instrument, and archiving the measurement report.

[0011] Preferably, the sensing component includes dynamic laser ranging, track width laser ranging, a gyroscope, and a magnetic encoder, and the laser ranging sensor includes a dynamic laser module and a track width laser module, combined with a magnetic encoder and a gyroscope.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the method and system for measuring the geometric parameters of the track contact network can quickly measure the geometric parameters of the contact network, with high data accuracy and fast calculation efficiency; it is easy to operate, can analyze and process data in real time, and can save, analyze, share and other operations on the data as needed; at the same time, the developed management system can better archive equipment assets and retain reports, which is convenient for later data tracing, improving the shortcomings of the prior art of inaccurate measurement data and chaotic report filing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0014] Figure 1 The present invention discloses a system operation flow chart of a method and system for measuring geometric parameters of a track contact network.

[0015] Figure 2 The invention discloses a data flow chart of a method and system for measuring geometric parameters of a track contact network.

[0016] Figure 3 The present invention is a schematic diagram of the measurement status of a method and system for measuring geometric parameters of a track contact network.

[0017] Figure 4 The present invention is a schematic diagram of the measurement pull-out value state of a method and system for measuring geometric parameters of a track contact network.

[0018] Figure 5 The present invention is a schematic diagram of a negative state of a measurement pull-out value of a method and system for measuring geometric parameters of a track contact network.

[0019] Figure 6 The present invention is a schematic diagram of a track contact network geometric parameter measurement method and system, showing a positive state of a measured pull-out value.

[0020] Figure 7 The present invention is a schematic diagram of the pillar side measurement state of a method and system for measuring geometric parameters of a track contact network. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiments of the present invention, such as Figure 1-6 As shown, Embodiment 1: The present invention discloses a track contact network geometric parameter measurement system, including a measuring instrument, an initialization calibration APP, a measurement APP, a track contact network geometric parameter measurement device management system, and a sensor component built into the measuring instrument. The measuring instrument is used to collect built-in sensor data and transmit it to the initialization calibration APP and the measurement APP via wireless WIFI; The initialization and calibration APP is used to perform parameter initialization and sensor calibration functions on the measuring instrument; The measurement APP is used to obtain the data of the sensor component and calculate in real time the geometric parameters such as the distance between the center of the contact network and the rail surface, the height of the guide, the pull-out value, etc., and can generate a measurement report; The rail contact network geometric parameter measuring device management system provides functions such as downloading of measurement APP and initialization calibration APP, registration of factory information of measuring instrument, and archiving of measurement reports.

[0023] The sensor assembly includes a laser distance sensor, a magnetic encoder and a gyroscope. The laser distance sensor includes a dynamic laser module and a track width laser module, which are combined with a magnetic encoder and a gyroscope to collect accurate values.

[0024] Embodiment 2: The present invention also discloses a method for measuring geometric parameters of a track contact network. The schematic diagram of the measuring instrument when placed on a rail for measurement is as follows: Figure 3 As shown: End C is the fixed end of the instrument, end D is the movable end of the instrument to adapt to different track widths, point O is the midpoint of CD, i.e. the center point of the track, point B is the laser emission point, and point A is the measured point.

[0025] Initialize the measuring instrument through the initialization calibration APP tool.

[0026] 1. Basic Configuration Provides reading and writing of basic information such as device serial number, CF length, BF length, etc. The CF length and BF length are fixed by the structure and will not change during actual measurement and use, so the value needs to be written once before use; 2. Sensor Calibration There are four sensors on the measuring instrument, namely: dynamic laser ranging (obtaining BA length), track width laser ranging (measuring CD length), gyroscope (equipment tilt angle), and magnetic encoder (obtaining ∠HBA).

[0027] Dynamic laser calibration: The object to be measured is placed at a standard distance of 10 meters. If the measurement result is different from the standard distance, you need to enter 10 meters in the "reference value" of the corresponding item in the initialization calibration APP tool for calibration, and then adjust the object to 15 meters and 20 meters for verification. Once the verification is correct, the calibration is completed; Rail width laser calibration: Fix the measuring instrument on the preset standard rail. If the measurement result is different from the standard rail width, you need to enter the standard length in the "reference value" of the corresponding item of the initialization calibration APP tool for calibration, and then adjust the movable end of the measuring instrument and place it on another preset standard rail for verification. If the verification is correct, the calibration is completed; Gyroscope calibration: Place the measuring instrument on a standard horizontal table, and enter 0° in the "reference value" of the corresponding item in the initialization calibration APP tool for calibration; Magnetic encoder: Measure and calibrate the magnetic encoder module of the measuring instrument from 0°, 45°, 90°, and 180° in sequence. The calibration is completed after verification. After initialization and verification of various information parameters are completed, measurement can be carried out.

[0028] Measure various geometric parameters through the measurement APP 1. Numerical algorithm for the distance between track midpoint and contact network (OA) The known fixed values ​​are the CF length, the BF length, and the measured values ​​AB length, CD length, and the measured angle ∠HBA, the tilt angle of the gyroscope.

[0029] Step 1. Calculate ∠ABG: When ∠HBA is greater than or equal to 0° and less than 180°, ∠ABG = 180°-∠HBA; When ∠HBA is greater than 180° and less than or equal to 360°, ∠ABG = 540°-∠HBA; Step 2: Calculate ∠GBO: FO = CF - (CD / 2); In the right triangle BOF, the Pythagorean theorem: BO = square root (BF² + FO²), tangent function: ∠BOF = arctan(BF / FO), because the alternate angles of parallel lines are equal, so ∠GBO = ∠BOF; Step 3. Calculate ∠ABO: When ∠HBA is greater than or equal to 0° and less than 180°, ∠ABO = ∠ABG + ∠GBO; When ∠HBA is greater than 180° and less than or equal to 360°, ∠ABO = |360°-(∠ABG+∠GBO)|; Calculation results OA: In triangle ABO, the cosine theorem OA = square root (AB²+OB²-2*AB*OB*cos(∠ABO)) 2. Algorithm of the value of the guide height (OA') Conductor height is the height of the contact conductor, which is the vertical length of the contact conductor point relative to the rail surface. Figure 4 shown.

[0030] Step 1: Calculate ∠AOB: In triangle ABO, according to the law of cosines, ∠AOB = arccos( (OA²+OB²-AB²) / 2*OA*OB ); Step 2: Calculate ∠AOC: ∠AOC = 180-(∠AOB+∠BOF); Objective: Calculate the conductance OA': Since the alternate angles of parallel lines are equal, ∠A'AO = ∠AOD. Law of sines, OA' = sin(∠A'AO)*OA; 3. Pull Value (SA) Algorithm The pull-out value is the distance from the contact point to the center of the pantograph, e.g. Figure 4 shown.

[0031] Reuse the above algorithm data ∠AOC and calculate ∠AOS = ∠AOC-90°; In triangle ASO, according to the sine function, SA=sin(∠AOS-90)*OA Explanation: The calculated value of SA can be positive or negative. When the calculated value of SA is negative, ∠AOC is less than 90°, which means that the contact point is on the other side of point B relative to the center axis of OS. Figure 5 As shown; When the calculated value of SA is positive, it means that the contact point is on the same side of the OS center axis as point B. Figure 6 shown.

[0032] 4. Pillar side limit value (OA') algorithm The side limit of the pillar refers to the safe distance set from the side of the pillar close to the line to the center line of the line in order to ensure the safety of driving. Figure 7 OA' shown.

[0033] During actual measurement, the operator uses the level ruler on the instrument to judge and adjust so that BA remains horizontal.

[0034] Calculate ∠AOA': If ∠AOC is greater than 90°, ∠AOA' = |180-∠AOC-|∠A'OC||; If it is less than 90°, ∠AOA' = |∠AOC-|∠A'OC||; Calculate OA': OA' = sin(90°-∠AOA')*OA.

[0035] The present track contact network geometric parameter measurement method cooperates with the corresponding system to quickly measure the contact network geometric parameters, with high data accuracy and fast calculation efficiency; it is easy to operate, can analyze and process data in real time, and can save, analyze, and share the data as needed; at the same time, the developed management system can better archive equipment assets and retain reports, which is convenient for later data tracing, improving the shortcomings of the existing technology of inaccurate measurement data and confusing report filing.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for measuring geometric parameters of a track contact network, characterized in that: Place the measuring instrument on the rail, with the C end as the fixed end, the D end as the movable end, the O point as the midpoint of CD, i.e. the center point of the track, the B point as the laser emission point, and the A point as the measured point. S1. Initialize the measuring instrument through the initialization calibration APP tool; S2, provides reading and writing of basic information such as device serial number, CF length, BF length, etc. The CF length and BF length are fixed by the structure and will not change during actual measurement and use. The value needs to be written once before use; S3. Dynamic laser calibration: The object to be measured is placed at the selected standard distance. If the measurement result is different from the standard distance, you need to enter the selected standard distance value in the "reference value" of the corresponding item of the initialization calibration APP tool for calibration, and then adjust the object to the new selected standard distance. Repeat the above operation for verification. If the verification is correct, the calibration is completed; S4. Rail width laser calibration: Fix the measuring instrument on the preset standard rail. If the measurement result is different from the standard rail width, enter the standard length in the "reference value" of the corresponding item in the initialization calibration APP tool for calibration. Then adjust the movable end of the measuring instrument and place it on another preset standard rail for verification. Once the verification is correct, the calibration is completed. S5. Gyroscope calibration: Place the measuring instrument on a standard horizontal table, and enter 0° in the "reference value" of the corresponding item in the initialization calibration APP tool for calibration; S6, magnetic encoder: measure and calibrate the magnetic encoder module of the measuring instrument from 0°, 45°, 90°, and 180° in sequence. After verification, the calibration is completed. After the initialization and verification of various information parameters are completed, measurement can be carried out.

2. The method for measuring geometric parameters of a track contact network according to claim 1, characterized in that: The numerical algorithm for the distance OA between the track midpoint and the overhead contact network is: The fixed values ​​are CF length, BF length, and the measured values ​​AB length, CD length, and the measured angle ∠HBA, the tilt angle of the gyroscope, S1. Calculate ∠ABG. When ∠HBA is greater than or equal to 0° and less than 180°, ∠ABG = 180°-∠HBA; when ∠HBA is greater than 180° and less than or equal to 360°, ∠ABG = 540°-∠HBA. S2. Calculate ∠GBO, FO = CF - (CD / 2); in the right triangle BOF, the Pythagorean theorem: BO = square root (BF² + FO²), tangent function: ∠BOF = arctan(BF / FO), because the alternate angles of parallel lines are equal, so ∠GBO = ∠BOF; S3. Calculate ∠ABO. When ∠HBA is greater than or equal to 0° and less than 180°, ∠ABO = ∠ABG + ∠GBO; when ∠HBA is greater than 180° and less than or equal to 360°, ∠ABO = |360°-(∠ABG + ∠GBO)|; S4. The calculation result OA is formed. In the triangle ABO, the cosine theorem OA = square root (AB²+OB²-2*AB*OB*cos(∠ABO)).

3. The method for measuring geometric parameters of a track contact network according to claim 2, characterized in that: OA' algorithm for the value of the conductor height: The conductor height is the height of the contact conductor, which is the vertical length of the contact conductor point relative to the rail surface. S1. Calculate ∠AOB: In triangle ABO, according to the law of cosines, ∠AOB = arccos( (OA²+OB²-AB²) / 2*OA*OB ); S2. Calculate ∠AOC: ∠AOC = 180-(∠AOB+∠BOF); Calculate the height OA': Because the alternate angles of parallel lines are equal, ∠A'AO = ∠AOD, and according to the law of sine, OA' = sin(∠A'AO)*OA.

4. The method for measuring geometric parameters of a track contact network according to claim 3, characterized in that: Pull-out value SA algorithm, the pull-out value is the distance between the contact point and the pantograph center, reuse the above algorithm data ∠AOC, calculate ∠AOS = ∠AOC-90°; In triangle ASO, according to the sine function, SA=sin(∠AOS-90)*OA, the calculated value of SA has positive and negative values. When the calculated value of SA is negative, ∠AOC is less than 90°. At this time, the contact point is on the other side of point B with respect to the central axis of OS. When the calculated value of SA is a positive value, the contact point is on the same side as point B with respect to the central axis of OS.

5. The method for measuring geometric parameters of a track contact network according to claim 4, characterized in that: The side limit value OA' algorithm of the pillar refers to the safe distance OA' set from the side of the pillar to the center line of the line to ensure the safety of driving. The operator uses the level ruler on the measuring instrument to judge and adjust so that BA remains level; Calculate ∠AOA'. If ∠AOC is greater than 90°, ∠AOA' = |180-∠AOC-|∠A'OC||; if it is less than 90°, ∠AOA' = |∠AOC-|∠A'OC||; calculate OA': OA' = sin(90°-∠AOA')*OA.

6. A track contact network geometric parameter measurement system, based on the track contact network geometric parameter measurement method according to any one of claims 1 to 5, characterized in that: It includes a measuring instrument, an initialization and calibration APP, a measurement APP, a track contact network geometric parameter measuring device management system, and a built-in sensor component of the measuring instrument. The measuring instrument is used to collect data from the built-in sensor component and transmit it to the initialization calibration APP and the measurement APP via wireless WIFI. The initialization and calibration APP is used to initialize the parameters of the measuring instrument and calibrate the sensor components. The measurement APP is used to obtain the sensor component data and calculate in real time the geometric parameters such as the distance between the center of the contact network and the rail surface, the height of the guide, the pull-out value, etc., and can generate a measurement report. The rail contact network geometric parameter measuring device management system provides the functions of downloading the measurement APP and the initialization calibration APP, registering the factory information of the measuring instrument, and archiving the measurement report.

7. The track contact network geometric parameter measurement system according to claim 6, characterized in that: The sensing components include dynamic laser ranging, track width laser ranging, gyroscope, and magnetic encoder. The laser ranging sensor includes a dynamic laser module and a track width laser module, combined with a magnetic encoder and a gyroscope.

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