Track crack monitoring method and system based on multi-sensor application

Abstract

The present invention belongs to the field of rail transit safety detection technology, and proposes a track crack monitoring method and system based on multi-sensor application. The main scheme includes: obtaining train position information based on a first passive wireless vibration sensor, and notifying a processor to start a vibration transmitter and a second passive wireless vibration sensor; setting the vibration signal transmission frequency of the vibration transmitter and the control strategy during crack monitoring; after the vibration transmitter starts to transmit the vibration signal outward, it is fed back to the processor after frequency modulation processing by the second passive wireless vibration sensor, and the processor determines the track crack situation information in the track section to be monitored, and the vibration signal transmission frequency does not belong to the vibration signal frequency set. The present invention can set different track crack monitoring strategies according to the specific situation of the track section to be monitored, without the need to collect a large number of vibration signals, and only needs to perform a relatively simple signal processing process to know the location of the track crack.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit safety detection, and in particular to a rail crack monitoring method and system based on multi-sensor application. Background Art

[0002] After the rails are installed and put into operation, cracks will inevitably appear due to the different nature and frequency of use of the rails. If the cracks in the rails are not discovered in time, they will seriously threaten the safety of the train. Under normal operating conditions, the wheels transfer vibration energy to the rails through Hertz elastic contact, and at the same time, the vibration energy of some sleepers under the rails is transferred to the rails through fasteners, resulting in a large peak value of rail vibration at low frequencies. The high-frequency vibration energy of the rails is attenuated by the fasteners and sleeper supports, and has almost no effect on the roadbed.

[0003] At present, most of the monitoring schemes for rail cracks are based on the collected vibration signals, and then after detailed data analysis of the vibration signals, it is determined whether the rails have cracks and the crack degree and crack location; there are also rail crack monitoring schemes that use the collected vibration signals as data sets, and then train the rail crack recognition model based on neural networks to achieve accurate judgment of rail cracks. However, traditional crack monitoring schemes, when performing data analysis or training rail crack recognition models based on neural networks, mostly require a large amount of data sets as support, and even if a rail crack recognition model based on neural networks is trained, the model still needs to be installed on the client for efficient operation, which causes excessive data processing pressure on the client. Summary of the invention

[0004] The purpose of the present invention is to provide a rail crack monitoring method and system based on multi-sensor application, which can set different rail crack monitoring strategies according to the specific conditions of the track section to be monitored. There is no need to collect a large amount of vibration signals, and only a relatively simple signal processing process is required to know the location of the rail crack.

[0005] The present invention solves the technical problem and adopts the following technical solution:

[0006] In one aspect, the present invention provides a rail crack monitoring method based on multi-sensor application, comprising the following steps:

[0007] Setting a track section to be monitored, and configuring a first passive wireless vibration sensor, a vibration transmitter, and a processor for the track section to be monitored;

[0008] Acquire position information of a first number of image sensors installed on both sides of the track before the starting position of the track section to be monitored, and calculate first installation position information of a first passive wireless vibration sensor based on the position information of the image sensors and the track section to be monitored;

[0009] Acquire a vibration signal frequency set of the train during its movement along the traveling direction through a first passive wireless vibration sensor;

[0010] Calculating second installation position information of a second passive wireless vibration sensor on a sleeper within the track section to be monitored;

[0011] Acquire train location information based on the first passive wireless vibration sensor, and notify the processor to start the vibration transmitter and the second passive wireless vibration sensor;

[0012] Set the vibration signal transmission frequency of the vibration transmitter and the control strategy for crack monitoring;

[0013] After the vibration transmitter starts to emit a vibration signal, it is fed back to the processor after frequency modulation processing by the second passive wireless vibration sensor. The processor determines the track crack condition information in the track section to be monitored. The vibration signal transmission frequency does not belong to the vibration signal frequency set.

[0014] As a further optimization, the calculating of the second installation position information of the second passive wireless vibration sensor on the sleeper in the track section to be monitored comprises the following steps:

[0015] Obtain communication status information, track curvature information, track inclination information and track material information within a set track section;

[0016] Acquire the installation sleeper of the second passive wireless vibration sensor based on the communication status information, the track curvature information, the track inclination information and the track material information;

[0017] sequentially installing the second passive wireless vibration sensors on the corresponding sleepers;

[0018] The second installation position information of each passive wireless vibration sensor is obtained.

[0019] As a further optimization, the first number of sensors includes a first image sensor, a second image sensor, and a third image sensor.

[0020] As a further optimization, the position information of the first number of image sensors installed on both sides of the track before obtaining the starting position of the track section to be monitored refers to:

[0021] Respectively obtaining the position information of the first image sensor, the position information of the second image sensor, and the position information of the third image sensor before the starting position of the monitoring track section;

[0022] Respectively projecting the position information of the first image sensor, the position information of the second image sensor, and the position information of the third image sensor vertically onto the track to obtain a first projection point, a second projection point, and a third projection point;

[0023] The travel distances of the train from the three projection points to the starting point of the track section to be monitored are obtained according to the travel direction of the train, and the three image sensors are sorted from long to short according to the travel distances, and stored in a list form.

[0024] As a further optimization, the method of calculating the first installation position information of the first passive wireless vibration sensor based on the position information of the image sensor and the track section to be monitored includes the following steps:

[0025] Setting a required travel distance;

[0026] Get the specified projection point corresponding to the specified travel distance;

[0027] Installing a first passive wireless vibration sensor on a rail sleeper that is closest to the specified projection point;

[0028] First installation position information of the first passive wireless vibration sensor is obtained.

[0029] As a further optimization, the control strategy of the first passive wireless vibration sensor during crack monitoring is:

[0030] Get the three travel distances stored in the list;

[0031] Subtract the three travel distances from the prescribed travel distance respectively;

[0032] If the three travel distances are all greater than or less than the specified travel distance, the first passive wireless vibration sensor is controlled to be always activated;

[0033] If any of the three traveling distances is equal to the prescribed traveling distance, or if at least one traveling distance is less than the prescribed traveling distance and at least one traveling distance is greater than the prescribed traveling distance, an image sensor corresponding to a traveling distance greater than the smallest of the prescribed traveling distances is obtained and used as a preset image sensor. When the preset image sensor senses a train image, the first passive wireless vibration sensor is controlled to start.

[0034] As a further optimization, when the first passive wireless vibration sensor is always started, the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is obtained in real time through the first passive wireless vibration sensor, and the vibration signal frequency set is queried. When the real-time vibration signal frequency belongs to the vibration signal frequency set, the vibration transmitter and the second passive wireless vibration sensor are controlled to be turned off;

[0035] When the first passive wireless vibration sensor controlled by the preset image sensor is started, the real-time vibration signal frequency of the train while it is moving along the traveling direction is obtained through the first passive wireless vibration sensor, and the vibration signal frequency set is queried. When the real-time vibration signal frequency belongs to the vibration signal frequency set, the vibration transmitter and the second passive wireless vibration sensor are controlled to be turned off, and the first passive wireless vibration sensor is controlled to be turned off at the same time.

[0036] As a further optimization, the control strategy of the second passive wireless vibration sensor and the vibration transmitter during crack monitoring is:

[0037] For the first passive wireless vibration sensor that is normally activated, if the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is not obtained within a first preset time, the second passive wireless vibration sensor and the vibration transmitter are controlled to be activated after the train leaves the track section to be monitored;

[0038] For the first passive wireless vibration sensor controlled by the preset image sensor to be started, after being started, if the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is not obtained within a second preset time, the second passive wireless vibration sensor and the vibration transmitter are controlled to be started after the train leaves the track section to be monitored;

[0039] The second preset time is greater than the first preset time.

[0040] As a further optimization, the frequency modulation processing of the second passive wireless vibration sensor is fed back to the processor, and the processor determines the track crack condition information in the track section to be monitored, which means:

[0041] If the vibration signal transmission frequency of the vibration transmitter is the first frequency, after the second passive wireless vibration sensor senses the vibration signal of the first frequency, the vibration signal of the first frequency is modulated to a vibration signal of a second frequency and fed back to the processor, and the second frequency does not belong to the vibration signal frequency set;

[0042] Determine the difference between the second frequency and the first frequency of the vibration signal, and if the difference exceeds a preset frequency value, obtain the position information of the second passive wireless sensor that feeds back the vibration signal of the second frequency;

[0043] The position information of the second passive wireless sensor that feeds back the vibration signal of the second frequency is stored in the remote control platform and forwarded to the operation and maintenance management terminal.

[0044] On the other hand, the present invention also provides a rail crack monitoring system based on multi-sensor application, which is applied to the rail crack monitoring method based on multi-sensor application, comprising:

[0045] A configuration unit, used for setting a track section to be monitored, and configuring a first passive wireless vibration sensor, a vibration transmitter and a processor for the track section to be monitored;

[0046] a first passive wireless vibration sensor, configured to obtain train position information based on the first passive wireless vibration sensor, and notify the processor to start the vibration transmitter and the second passive wireless vibration sensor;

[0047] A vibration transmitting source, used for transmitting a vibration signal outward after being started;

[0048] A second passive wireless vibration sensor is used to sense the transmitted vibration signal after being started, and after sensing the transmitted vibration signal, frequency modulate the signal and feed it back to the processor;

[0049] A processor, configured to obtain position information of a first number of image sensors installed on both sides of the track before the starting position of the track section to be monitored, and calculate first installation position information of a first passive wireless vibration sensor based on the position information of the image sensors and the track section to be monitored;

[0050] The method is used to obtain a set of vibration signal frequencies of a train during its movement along a travel direction through a first passive wireless vibration sensor; calculate second installation position information of a second passive wireless vibration sensor on a rail sleeper within a track section to be monitored; and set a vibration signal transmission frequency of a vibration transmitter and a control strategy for crack monitoring;

[0051] It is also used to determine the track crack condition information in the track section to be monitored after receiving the frequency-modulated vibration signal from the second passive wireless vibration sensor, and the vibration signal transmission frequency does not belong to the vibration signal frequency set.

[0052] The beneficial effects of the present invention are: through the above-mentioned rail crack monitoring method and system based on multi-sensor application, different rail crack monitoring strategies can be set according to the specific conditions of the track section to be monitored. Only when the second passive wireless vibration sensor needs to be started, the rail vibration monitoring will be started. There is no need to collect a large number of vibration signals. After the second passive wireless vibration sensor senses the vibration signal, it only needs to perform frequency modulation processing on the vibration signal to know the location of the rail crack. Due to the simple data processing process, the present invention can quickly inform the location of the rail crack, which not only reduces the data processing pressure of the processor, but also can notify the remote control platform and the operation and maintenance management terminal more timely, thereby improving the safety of the rail crack monitoring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a flow chart of a rail crack monitoring method based on multi-sensor application in Example 1 of the present invention. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Example 1

[0056] This embodiment provides a rail crack monitoring method based on multi-sensor application, and its flow chart is shown in Figure 1 , wherein the method comprises the following steps:

[0057] S1. Setting a track section to be monitored, and configuring a first passive wireless vibration sensor, a vibration transmitter and a processor for the track section to be monitored;

[0058] S2, obtaining position information of a first number of image sensors installed on both sides of the track before the starting position of the track section to be monitored, and calculating first installation position information of the first passive wireless vibration sensor based on the position information of the image sensors and the track section to be monitored;

[0059] S3, obtaining a set of vibration signal frequencies of the train during its movement along the traveling direction through a first passive wireless vibration sensor;

[0060] S4, calculating second installation position information of the second passive wireless vibration sensor on the sleeper in the track section to be monitored;

[0061] S5. Acquire train location information based on the first passive wireless vibration sensor, and notify the processor to start the vibration transmitter and the second passive wireless vibration sensor;

[0062] S6, setting the vibration signal transmission frequency of the vibration transmitter and the control strategy during crack monitoring;

[0063] S7. After the vibration transmitter starts to emit a vibration signal, it is fed back to the processor after frequency modulation processing by the second passive wireless vibration sensor. The processor determines the track crack condition information in the track section to be monitored. The vibration signal transmission frequency does not belong to the vibration signal frequency set.

[0064] In the present embodiment, since the image sensor reuses the already installed image sensors and not all track sections will be installed, after setting the track section to be monitored, in order to obtain the train position, if there is an image sensor that can be reused before the track section to be monitored, then the image sensor is used to obtain the train position information. If there is no image sensor before the track section to be monitored, or the image sensor is too far away from the track section to be monitored, the image sensor cannot be reused at this time. Therefore, a vibration sensor is needed to sense the position of the train, and traditional vibration sensors are generally wired and require power supply, which makes traditional active wired vibration sensors prone to failure. Therefore, in order to ensure the normal operation time of the vibration sensor, in the present embodiment, the vibration sensor selects a passive wireless vibration sensor.

[0065] In addition, the setting of the specified travel distance is more based on the consideration that the first passive wireless vibration sensor can sense the vibration signal when the train is running on the track. However, its sensing range needs to take into account the train running speed and running distance. Therefore, it is necessary to set a specified travel distance. After the first passive wireless vibration sensor is installed at the sleeper position corresponding to the specified travel distance, it can sense the passing train, and then it can still remind to turn off the vibration transmitting source and the second passive wireless vibration sensor when there is no image sensor that can be reused. This is because after the train passes through the track section to be monitored, it will affect the frequency of the vibration signal. Therefore, in this embodiment, as long as the train passes through the sensing position of the first passive wireless vibration sensor, it is necessary to turn off the vibration transmitting source and the second passive wireless vibration sensor. After the train passes, the vibration transmitting source and the second passive wireless vibration sensor are turned on to monitor the vibration track cracks.

[0066] It should be pointed out that the purpose of setting the second passive wireless vibration sensor is to sense the vibration signal of the vibration transmitting source. When the transmitted vibration signal is sensed by the second passive wireless vibration sensor, the vibration signal can be frequency modulated to notify the processor to determine whether cracks appear at the corresponding rail position. When setting the track section to be monitored, the length of the section can be flexibly adjusted, and then the corresponding second passive wireless vibration sensor can be installed at different sleeper positions. However, not all rails are straight, and there may be curved sections and slopes. In addition, the vibration signal frequency of each material of rail is inconsistent when vibrating. Of course, after the second passive wireless vibration sensor senses the vibration signal, it is also necessary to send the sensed signal to the processor. Due to the different lengths of the track sections to be monitored, data delays or data loss are inevitable. Therefore, when setting the position of the second passive wireless vibration sensor, the network communication status in the track section to be monitored also needs to be considered.

[0067] Therefore, in this embodiment, the calculation of the second installation position information of the second passive wireless vibration sensor on the sleeper in the track section to be monitored may include the following steps:

[0068] Obtain communication status information, track curvature information, track inclination information and track material information within a set track section;

[0069] Acquire the installation sleeper of the second passive wireless vibration sensor based on the communication status information, the track curvature information, the track inclination information and the track material information;

[0070] sequentially installing the second passive wireless vibration sensors on the corresponding sleepers;

[0071] The second installation position information of each passive wireless vibration sensor is obtained.

[0072] It should be pointed out that, for the image sensor, it reuses the existing image sensors installed on both sides of the track. However, when using the image sensor to sense the train position information, if only a single image sensor is used to implement this function, it is easy to fail to obtain accurate train position information in time when the image sensor fails, resulting in failure to shut down the vibration transmitter and the second passive wireless vibration sensor in time, resulting in an increase in the error of the second passive wireless vibration sensor sensing the vibration signal. Therefore, it is best to set a plurality of image sensors. Specifically, in this embodiment, the first number of sensors may include a first image sensor, a second image sensor, and a third image sensor.

[0073] In actual application, since it cannot be guaranteed that the tracks of the track section to be monitored are all straight, nor can it be guaranteed that the actual working conditions of the track section to be monitored are completely consistent, in order to obtain accurate train position information, it is necessary to set the three image sensors of this embodiment in detail so as to accurately obtain the train position information, and then accurately notify the processor of the time to turn off the vibration emission source and the second wireless vibration sensor. Therefore, in this embodiment, the position information of the first number of image sensors installed on both sides of the track before obtaining the starting position of the track section to be monitored can refer to:

[0074] Respectively obtaining the position information of the first image sensor, the position information of the second image sensor, and the position information of the third image sensor before the starting position of the monitoring track section;

[0075] Respectively projecting the position information of the first image sensor, the position information of the second image sensor, and the position information of the third image sensor vertically onto the track to obtain a first projection point, a second projection point, and a third projection point;

[0076] The travel distances of the train from the three projection points to the starting point of the track section to be monitored are obtained according to the travel direction of the train, and the three image sensors are sorted from long to short according to the travel distances, and stored in a list form.

[0077] Considering that the setting position of the first passive wireless vibration sensor needs to refer to the distribution position of the image sensor, and the first passive wireless vibration sensor is used to sense the vibration signal of the train when it is running on the rail after installation, and accurately know the train position by the frequency and strength of the vibration signal, therefore, in this embodiment, the first installation position information of the first passive wireless vibration sensor is calculated based on the position information of the image sensor and the track section to be monitored, which may include the following steps:

[0078] Setting a required travel distance;

[0079] Get the specified projection point corresponding to the specified travel distance;

[0080] Installing a first passive wireless vibration sensor on a rail sleeper that is closest to the specified projection point;

[0081] First installation position information of the first passive wireless vibration sensor is obtained.

[0082] Specifically, after setting the specified travel distance, there may be many situations due to the positions of the three image sensors, such as: one situation is that the projection points of the three image sensors are all outside the specified travel distance or are all within the specified travel distance. At this time, the image sensor can no longer be used to assist in knowing the train position, and the train position can only be determined by the vibration signal sensed by the first wireless vibration sensor; another situation is that the projection points of the three image sensors coincide with the starting point of the preset specified travel distance. At this time, this sensor can be used to sense the train image information and then obtain the train position information; there is another situation that the starting point of the preset specified travel distance is between the projection points of the three image sensors. In this case, you can also choose to use a suitable image sensor to sense the train image information and then obtain the train position information.

[0083] Therefore, in this embodiment, the control strategy of the first passive wireless vibration sensor during crack monitoring may be:

[0084] Get the three travel distances stored in the list;

[0085] Subtract the three travel distances from the prescribed travel distance respectively;

[0086] If the three travel distances are all greater than or less than the specified travel distance, the first passive wireless vibration sensor is controlled to be always activated;

[0087] If any of the three traveling distances is equal to the prescribed traveling distance, or if at least one traveling distance is less than the prescribed traveling distance and at least one traveling distance is greater than the prescribed traveling distance, an image sensor corresponding to a traveling distance greater than the smallest of the prescribed traveling distances is obtained and used as a preset image sensor. When the preset image sensor senses a train image, the first passive wireless vibration sensor is controlled to start.

[0088] Here, due to the relationship between the projection point of the image sensor and the starting point of the preset travel distance, the first passive wireless vibration sensor needs to set different startup control strategies. One situation is that the image sensor cannot be reused. At this time, the first passive wireless vibration sensor needs to be started frequently to obtain the train position information. Another situation is that the image sensor can be reused. At this time, it is only necessary to start the first passive wireless vibration sensor after the image sensor senses the train image information. This can reduce the power consumption of the first passive wireless vibration sensor and extend the service life.

[0089] Specifically, when the first passive wireless vibration sensor is normally started, the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is obtained in real time through the first passive wireless vibration sensor, and the vibration signal frequency set is queried. When the real-time vibration signal frequency belongs to the vibration signal frequency set, the vibration transmitter and the second passive wireless vibration sensor are controlled to be turned off;

[0090] When the first passive wireless vibration sensor controlled by the preset image sensor is started, the real-time vibration signal frequency of the train while it is moving along the traveling direction is obtained through the first passive wireless vibration sensor, and the vibration signal frequency set is queried. When the real-time vibration signal frequency belongs to the vibration signal frequency set, the vibration transmitter and the second passive wireless vibration sensor are controlled to be turned off, and the first passive wireless vibration sensor is controlled to be turned off at the same time.

[0091] It should be pointed out that after the first passive wireless vibration sensor notifies the second passive wireless vibration sensor and the vibration transmitter to shut down, if the second passive wireless vibration sensor and the vibration transmitter are to be controlled to start again, because the situation of multiplexing the image sensor is different, different control strategies are required for the first passive wireless vibration sensor that is always started and for the first passive wireless vibration sensor that is started by controlling the preset image sensor. Therefore, in this embodiment, the control strategy of the second passive wireless vibration sensor and the vibration transmitter during crack monitoring can be:

[0092] For the first passive wireless vibration sensor that is normally activated, if the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is not obtained within a first preset time, the second passive wireless vibration sensor and the vibration transmitter are controlled to be activated after the train leaves the track section to be monitored;

[0093] For the first passive wireless vibration sensor controlled by the preset image sensor to be started, after being started, if the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is not obtained within a second preset time, the second passive wireless vibration sensor and the vibration transmitter are controlled to be started after the train leaves the track section to be monitored;

[0094] The second preset time is greater than the first preset time.

[0095] Here, in the case of the first passive wireless vibration sensor that is normally started, after the train leaves the track section to be monitored, the image sensor will not be reused, so the second passive wireless vibration sensor and the vibration transmitter can be directly and immediately notified to start; and in the case of the first passive wireless vibration sensor that is started by controlling the preset image sensor, the image sensor needs to be reused, and the image sensor cannot be guaranteed to be in a normal state all the time. The image sensor device may be under maintenance or failure, or even waiting for repair and cannot be reused in this embodiment. Therefore, it is necessary to ensure that there is an image sensor that can be reused normally before notifying the second passive wireless vibration sensor and the vibration transmitter to start. Therefore, generally speaking, the second preset time will be greater than the first preset time.

[0096] It should be pointed out that when selecting the data processing method of the second passive wireless vibration sensor, since the signal-to-noise ratio of the FM wave is high and the interference noise in the FM broadcast is small, the second passive wireless vibration sensor in this embodiment selects the FM data processing method. Therefore, in this embodiment, the FM processing of the second passive wireless vibration sensor is fed back to the processor, and the processor determines the track crack situation information in the track section to be monitored, which can refer to:

[0097] If the vibration signal transmission frequency of the vibration transmitter is the first frequency, after the second passive wireless vibration sensor senses the vibration signal of the first frequency, the vibration signal of the first frequency is modulated to a vibration signal of a second frequency and fed back to the processor, and the second frequency does not belong to the vibration signal frequency set;

[0098] Determine the difference between the second frequency and the first frequency of the vibration signal, and if the difference exceeds a preset frequency value, obtain the position information of the second passive wireless sensor that feeds back the vibration signal of the second frequency;

[0099] The position information of the second passive wireless sensor that feeds back the vibration signal of the second frequency is stored in the remote control platform and forwarded to the operation and maintenance management terminal.

[0100] Example 2

[0101] Based on Example 1, this embodiment provides a rail crack monitoring system based on multi-sensor application, which may include:

[0102] A configuration unit, used for setting a track section to be monitored, and configuring a first passive wireless vibration sensor, a vibration transmitter and a processor for the track section to be monitored;

[0103] a first passive wireless vibration sensor, configured to obtain train position information based on the first passive wireless vibration sensor, and notify the processor to start the vibration transmitter and the second passive wireless vibration sensor;

[0104] A vibration transmitting source, used for transmitting a vibration signal outward after being started;

[0105] A second passive wireless vibration sensor is used to sense the transmitted vibration signal after being started, and after sensing the transmitted vibration signal, frequency modulate the signal and feed it back to the processor;

[0106] A processor, configured to obtain position information of a first number of image sensors installed on both sides of the track before the starting position of the track section to be monitored, and calculate first installation position information of a first passive wireless vibration sensor based on the position information of the image sensors and the track section to be monitored;

[0107] The method is used to obtain a set of vibration signal frequencies of a train during its movement along a travel direction through a first passive wireless vibration sensor; calculate second installation position information of a second passive wireless vibration sensor on a rail sleeper within a track section to be monitored; and set a vibration signal transmission frequency of a vibration transmitter and a control strategy for crack monitoring;

[0108] It is also used to determine the track crack condition information in the track section to be monitored after receiving the frequency-modulated vibration signal from the second passive wireless vibration sensor, and the vibration signal transmission frequency does not belong to the vibration signal frequency set.

[0109] Referring to Example 1, the working principle and implementation method of this embodiment are consistent with those of Example 1, and thus will not be described in detail.

[0110] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rail crack monitoring method based on multi-sensor application, characterized in that: The steps include: Setting a track section to be monitored and configuring a first passive wireless vibration sensor, a vibration transmitter and a processor for the track section to be monitored; Before obtaining the starting position of the track section to be monitored, position information of a first number of image sensors installed on both sides of the track and calculating first installation position information of a first passive wireless vibration sensor based on the position information of the image sensors and the track section to be monitored; Acquire a vibration signal frequency set of the train during its movement along the traveling direction through a first passive wireless vibration sensor; Calculating second installation position information of a second passive wireless vibration sensor on a sleeper within the track section to be monitored; Acquire train location information based on the first passive wireless vibration sensor and notify the processor to start the vibration transmitter and the second passive wireless vibration sensor; Set the vibration signal transmission frequency of the vibration transmitter and the control strategy for crack monitoring: Get the three travel distances stored in the list; Subtract the three travel distances from the prescribed travel distance respectively; If the three travel distances are all greater than or less than the specified travel distance, the first passive wireless vibration sensor is controlled to be always activated; If any of the three travel distances is equal to the prescribed travel distance or at least one travel distance is less than the prescribed travel distance and at least one travel distance is greater than the prescribed travel distance, an image sensor corresponding to a travel distance greater than the smallest of the prescribed travel distances is obtained and used as a preset image sensor, and when the preset image sensor senses a train image, the first passive wireless vibration sensor is controlled to start; After the vibration transmitter starts to emit a vibration signal, it is fed back to the processor after frequency modulation processing by the second passive wireless vibration sensor. The processor determines the track crack condition information in the track section to be monitored. The vibration signal transmission frequency does not belong to the vibration signal frequency set.

2. The rail crack monitoring method based on multi-sensor application according to claim 1 is characterized in that: The step of calculating the second installation position information of the second passive wireless vibration sensor on the sleeper in the track section to be monitored comprises the following steps: Obtain communication status information, track curvature information, track inclination information and track material information within a set track section; Acquire the installation sleeper of the second passive wireless vibration sensor based on the communication status information, the track curvature information, the track inclination information and the track material information; sequentially installing the second passive wireless vibration sensors on the corresponding sleepers; The second installation position information of each passive wireless vibration sensor is obtained.

3. The rail crack monitoring method based on multi-sensor application according to claim 1 is characterized in that: The first number of sensors includes a first image sensor, a second image sensor, and a third image sensor.

4. The rail crack monitoring method based on multi-sensor application according to claim 2 is characterized in that: The position information of the first number of image sensors installed on both sides of the track before obtaining the starting position of the track section to be monitored refers to: Respectively obtaining the position information of the first image sensor, the position information of the second image sensor, and the position information of the third image sensor before the starting position of the monitoring track section; Respectively projecting the position information of the first image sensor, the position information of the second image sensor, and the position information of the third image sensor vertically onto the track to obtain a first projection point, a second projection point, and a third projection point; The travel distances of the train from the three projection points to the starting point of the track section to be monitored are obtained according to the travel direction of the train, and the three image sensors are sorted from long to short according to the travel distances, and stored in a list form.

5. The rail crack monitoring method based on multi-sensor application according to claim 4 is characterized in that: The method of calculating the first installation position information of the first passive wireless vibration sensor based on the position information of the image sensor and the track section to be monitored comprises the following steps: Setting a required travel distance; Get the specified projection point corresponding to the specified travel distance; Installing a first passive wireless vibration sensor on a rail sleeper that is closest to the specified projection point; First installation position information of the first passive wireless vibration sensor is obtained.

6. The rail crack monitoring method based on multi-sensor application according to claim 1 is characterized in that: When the first passive wireless vibration sensor is normally started, the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is obtained in real time through the first passive wireless vibration sensor, and the vibration signal frequency set is queried, and when the real-time vibration signal frequency belongs to the vibration signal frequency set, the vibration transmitter and the second passive wireless vibration sensor are controlled to be turned off; When the first passive wireless vibration sensor controlled by the preset image sensor is started, the real-time vibration signal frequency of the train while it is moving along the traveling direction is obtained through the first passive wireless vibration sensor, and the vibration signal frequency set is queried. When the real-time vibration signal frequency belongs to the vibration signal frequency set, the vibration transmitter and the second passive wireless vibration sensor are controlled to be turned off, and the first passive wireless vibration sensor is controlled to be turned off at the same time.

7. The rail crack monitoring method based on multi-sensor application according to claim 1 is characterized in that: The control strategy of the second passive wireless vibration sensor and the vibration transmitter during crack monitoring is: For the first passive wireless vibration sensor that is normally activated, if the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is not obtained within a first preset time, the second passive wireless vibration sensor and the vibration transmitter are controlled to be activated after the train leaves the track section to be monitored; For the first passive wireless vibration sensor controlled by the preset image sensor to be started, after being started, if the real-time vibration signal frequency of the train in the process of traveling along the traveling direction is not obtained within a second preset time, the second passive wireless vibration sensor and the vibration transmitter are controlled to be started after the train leaves the track section to be monitored; The second preset time is greater than the first preset time.

8. The rail crack monitoring method based on multi-sensor application according to claim 1 is characterized in that: The feedback to the processor after the frequency modulation processing by the second passive wireless vibration sensor, and the processor determining the track crack situation information in the track section to be monitored, refers to: If the vibration signal transmission frequency of the vibration transmitter is the first frequency, after the second passive wireless vibration sensor senses the vibration signal of the first frequency, the vibration signal of the first frequency is modulated to a vibration signal of a second frequency and fed back to the processor, and the second frequency does not belong to the vibration signal frequency set; Determine the difference between the second frequency and the first frequency of the vibration signal, and if the difference exceeds a preset frequency value, obtain the position information of the second passive wireless sensor that feeds back the vibration signal of the second frequency; The position information of the second passive wireless sensor that feeds back the vibration signal of the second frequency is stored in the remote control platform and forwarded to the operation and maintenance management terminal.

9. A rail crack monitoring system based on multi-sensor application, applied to a rail crack monitoring method based on multi-sensor application as claimed in any one of claims 1 to 8, characterized in that: include: A configuration unit, used for setting a track section to be monitored, and configuring a first passive wireless vibration sensor, a vibration transmitter and a processor for the track section to be monitored; a first passive wireless vibration sensor, configured to obtain train position information based on the first passive wireless vibration sensor, and notify the processor to start the vibration transmitter and the second passive wireless vibration sensor; A vibration transmitting source, used for transmitting a vibration signal outward after being started; A second passive wireless vibration sensor is used to sense the transmitted vibration signal after being started, and after sensing the transmitted vibration signal, frequency modulate the signal and feed it back to the processor; A processor, configured to obtain position information of a first number of image sensors installed on both sides of the track before the starting position of the track section to be monitored, and calculate first installation position information of a first passive wireless vibration sensor based on the position information of the image sensors and the track section to be monitored; The method is used to obtain a set of vibration signal frequencies of a train during its movement along a travel direction through a first passive wireless vibration sensor; calculate second installation position information of a second passive wireless vibration sensor on a rail sleeper within a track section to be monitored; and set a vibration signal transmission frequency of a vibration transmitter and a control strategy for crack monitoring; It is also used to determine the track crack condition information in the track section to be monitored after receiving the frequency-modulated vibration signal from the second passive wireless vibration sensor, and the vibration signal transmission frequency does not belong to the vibration signal frequency set.

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