CN110329308B - Track fracture inspection method and system - Google Patents
Track fracture inspection method and system Download PDFInfo
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- CN110329308B CN110329308B CN201910538920.1A CN201910538920A CN110329308B CN 110329308 B CN110329308 B CN 110329308B CN 201910538920 A CN201910538920 A CN 201910538920A CN 110329308 B CN110329308 B CN 110329308B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
- B61K9/08—Measuring installations for surveying permanent way
- B61K9/10—Measuring installations for surveying permanent way for detecting cracks in rails or welds thereof
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Abstract
The invention provides a rail fracture inspection method, which comprises the following steps: controlling a transmitter to transmit an electrical signal to N vibration generators, wherein N is an integer greater than 0; controlling the vibration generator to convert the electric signal into a vibration signal and transmitting the vibration signal to the steel rail; controlling M vibration sensors corresponding to the vibration generator to convert the received vibration signals into electric signals and send the electric signals to a receiver, wherein M is an integer greater than 0; and judging whether the track is broken or not according to the electric signal. The track fracture inspection method and system can realize real-time and efficient detection of track fracture, can detect a plurality of components in a turnout area, and are not interfered by an electric loop and a track signal; the control method and the equipment are flexible in arrangement, cost is saved, and control and management are facilitated; the system architecture is safe and stable, and the accuracy is high.
Description
Technical Field
The invention belongs to the field of rail transit, and particularly relates to a rail fracture inspection method and a rail fracture inspection system.
Background
Rail break inspection is increasingly gaining attention as an important inspection item relating to the safe operation of rail lines. For the section steel rail fracture, a method adopted in the prior art is mostly to detect whether an electrical on-off steel rail fracture fault occurs or not by using an electrical signal through a ZPW2000A track circuit device. The method comprises the following steps: the transmitter transmits an electric signal, and the electric signal is received by the receiver after passing through the steel rail; if the rail is broken, the electric signal can not reach the receiver through the steel rail, and the fault is reported at the moment. However, for the line between the turnout sections, the electrical short circuit of the turnout section caused by devices such as a slide plate on the line cannot be detected by adopting an electrical signal, and at present, the periodic flaw detection and routing inspection of a work department are mostly needed to realize the detection work of the breakage of the steel rail.
The periodic flaw detection and inspection mainly adopts an ultrasonic flaw detection vehicle or a manual inspection mode, and has the advantages of higher test accuracy and capability of finding early cracks of the steel rail; but the detection speed is slow, the efficiency is low, more skylight time is occupied, and all-weather detection cannot be carried out.
How to realize the real-time and efficient detection of track fracture and avoid the signal interference of a complex electric loop and a track circuit in a turnout area is a problem to be solved urgently in the technical field of current track traffic safety.
Disclosure of Invention
In view of the above problems, the present invention provides a rail fracture inspection method, including:
controlling a transmitter to transmit an electric signal to N vibration generators, wherein N is an integer greater than 0; controlling the vibration generator to convert the electric signal into a vibration signal and transmitting the vibration signal to the steel rail;
controlling M vibration sensors corresponding to the vibration generator to convert the received vibration signals into electric signals and send the electric signals to a receiver, wherein M is an integer greater than 0;
and judging whether the track is broken or not according to the electric signal.
Further, the judging whether the rail is broken according to the electric signal comprises:
controlling the receiver to judge whether the track is broken or not according to the received electric signal and sending a judgment result to a control center;
and/or
And controlling the receiver to send the received electric signal to the control center, and judging whether the track is broken or not by the control center according to the electric signal.
Further, the control transmitter transmitting the electrical signals to the N vibration generators includes:
the control transmitter converts one path of electric signals into N paths of amplified electric signals through the discharging circuit and transmits the N paths of amplified electric signals to the N vibration generators, wherein N is an integer greater than 1.
Further, the judging whether the rail is broken according to the electric signal comprises:
the control receiver processes the received multipath signals in a polling mode, and processes one path of signal in each polling period.
Further, the method comprises:
arranging the N vibration generators on the rail point rail and/or the point rail, wherein N is an integer larger than 1.
Further, disposing the N vibration generators on the rail point rail and/or the point rail comprises:
arranging a first vibration generator on a first point rail of a track turnout;
disposing a second vibration generator on a second point rail of the rail switch;
the receiver receives a first electric signal of a first vibration sensor corresponding to a first vibration generator;
the receiver receives a second electric signal of the first vibration sensor corresponding to the second vibration generator;
the judging whether the track is broken according to the electric signal comprises the following steps:
and comparing the first electric signal and the second electric signal with corresponding normal records respectively, and checking the signal abnormality caused by the environmental factors.
Further, the controlling the electrical signal received by the receiver to determine whether the rail is broken includes:
the receiver is provided with double CPUs (central processing units), and the double CPUs respectively adopt different algorithms to analyze and process the received electric signals;
and the analysis processing comprises comparing the difference between the electric signal and the normal state of the track and judging whether the track is broken.
The invention also provides a rail fracture inspection system, comprising:
a control center, at least one transmitter, at least one receiver, at least one vibration generator, at least one vibration sensor;
the control center is used for sending a vibration control instruction to the transmitter;
the transmitter is used for converting the vibration control command into an electric signal and transmitting the electric signal to the at least one vibration generator;
the vibration generator is used for converting the electric signal into a vibration signal and transmitting the vibration signal to the steel rail;
the vibration sensor is used for receiving the vibration signal, converting the received vibration signal into an electric signal and then sending the electric signal to the receiver;
the receiver is used for receiving the electric signal of the at least one vibration sensor;
the receiver is also used for judging whether the track is broken according to the received electric signal and sending the judgment result to the control center; and/or sending the received electric signal to the control center, and judging whether the track is broken or not by the control center according to the electric signal.
Further, the air conditioner is characterized in that,
the system comprises at least two vibration generators arranged on two points of the track or on a point and a point of the track;
the at least two vibration generators are connected to the same transmitter.
Further, the air conditioner is characterized in that,
the system comprises at least two vibration sensors, the vibration generators being arranged on two points of the track or on a point and a point of the track;
the at least two vibration sensors are connected with the same receiver.
Further, the air conditioner is provided with a fan,
the transmitter comprises a first processor, a second processor and a field programmable gate array, wherein the first processor and the second processor are connected with the field programmable gate array;
the first processor and the second processor are used for sending the vibration control instruction to the field programmable gate array;
the field programmable gate array is used for modulating the vibration control instructions from the first processor and the second processor to generate two groups of modulation frequency information;
the field programmable gate array is further configured to count the two modulation frequency information, generate two sets of count information, and send the two sets of count information to a review processor, where the review processor is the first processor or the second processor;
and the rechecking processor compares and judges the two groups of counting information.
Further, the air conditioner is provided with a fan,
the receiver comprises a first processor and a second processor;
the first processor and the second processor are used for respectively receiving vibration signals;
the first processor and the second processor are respectively used for processing the received vibration signals to obtain respective key data for calculation;
the first processor and the second processor are respectively used for carrying out crack detection calculation according to the respective key data, and the first processor and the second processor adopt different algorithms to execute the crack detection calculation to obtain a judgment result;
the first processor is used for sending the key data and the judgment result thereof to the second processor; the second processor is used for comparing the key data of the first processor and the second processor with a judgment result.
Further, the air conditioner is provided with a fan,
the receiver further comprises a back plate;
the backboard comprises a power supply module interface and a communication module interface;
the power supply module interface comprises a power supply interface and a solar power supply interface;
the communication module interface comprises CAN, 485 and USB interfaces.
The track fracture inspection method and system can realize real-time and efficient detection of track fracture, can detect a plurality of components in a turnout area, and are not interfered by an electric loop and a track signal; the control method and the equipment are flexible in arrangement, cost is saved, control and management are convenient, and detection coverage is comprehensive; the system architecture is safe and stable, and the accuracy of the detection process is improved by carrying out back detection on the sent frequency information, carrying out double-CPU comparison on the received information and carrying out reference judgment on the switch rail received information. The system device adopts a back plate type design, and is convenient for modular configuration.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 illustrates a flow chart of a rail break inspection method according to an embodiment of the present invention;
FIG. 2 illustrates a schematic view of a rail break inspection system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a turnout track break inspection system according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a transmitter architecture according to an embodiment of the invention;
fig. 5 shows a schematic diagram of a receiver structure according to an embodiment of the invention.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a track fracture inspection method, which detects whether a fracture fault occurs in a track or not by generating a vibration signal and transmitting the vibration signal on a track steel rail, wherein the fracture fault comprises track disconnection, cracks and other abnormalities, and the vibration signal is returned by a vibration sensor. The method of the present invention will be described below by taking the rail break detection of the turnout rail as an example.
As shown in fig. 1, a rail fracture inspection method according to an embodiment of the present invention includes:
(1) and sending a vibration control command to the transmitter. In this embodiment, the control center is a terminal having data storage, data processing, and human-computer interaction capabilities, and sends the control instruction. In practice, a control center may be communicatively coupled to one or more transmitters based on control areas and implementation requirements. The communication connection comprises a wired connection such as wired communication through CAN and 485 communication interfaces or a wireless connection such as communication through a 4G network. The vibration control instruction is a command for controlling the vibration of the vibration sensor, and includes designated sensor information, designated vibration frequency, designated occurrence time, and the like. Illustratively, the control center sends a vibration control command specifying that the sensor 1 immediately generates vibrations having a frequency of 180 kHz.
(2) Sending an electrical signal to the vibration generator. And (3) the transmitter transmits a modulation electric signal consistent with the frequency requirement to the vibration generator according to the received control command of the step (1). In this embodiment, one transmitter may be connected to N vibration generators, where N is an integer greater than 0. The transmitter can be controlled as desired:
simultaneously sending one path of electric signal to N vibration generators; alternatively, the first and second electrodes may be,
the control transmitter sends a plurality of electrical signals to the N vibration generators, where N is an integer greater than 1. The frequency of the multipath signals can be different, and the multipath signals can be sent in a time-sharing mode.
In this embodiment, N vibration generators are disposed on the point rail and the point rail of the rail, where N is an integer greater than 1. As shown in fig. 3, the point rail a and the point rail B of the track may be provided with a vibration generator, the point rail a and the point rail may be provided with a vibration generator, and the point rail a, the point rail B, and the point rail may be provided with a vibration transmitter. Preferably, the vibration generators on the point rail and point rail of one of the switches are controlled by a transmitter. In this embodiment, the control center controls the transmitter to simultaneously transmit one path of electrical signals to the vibration generators connected thereto, that is, simultaneously transmit the same modulated electrical signals to the plurality of vibration generators. In this embodiment, one transmitter has three outputs, and can be connected to switch point a, point B, and point rail under the condition of full connection. In this embodiment, the point rail a is provided with a first vibration generator and a first vibration sensor corresponding thereto, the point rail B is provided with a second vibration generator and a second vibration sensor corresponding thereto, and the point rail is provided with a third vibration generator and a third vibration sensor corresponding thereto. The transmitter generates a signal through a hardware circuit and sends the signal to the three-way vibration generator. The transmitter sends modulated pulse sequences to each path, and the purpose of preventing interference is achieved through signal modulation.
In this embodiment, before the electrical signal is sent, the modulated signal is also subjected to a return test by the dual CPU and the FPGA. The transmitter receives the vibration control instruction through the communication interface, performs signal modulation according to two CPU instructions of the transmitter to obtain two groups of frequency information, counts the two groups of frequency information, transmits the two groups of counting information to one of the CPUs for comparison, and considers that the modulation signal is correct when the two groups of counting information are consistent and can be transmitted.
(3) Sending a vibration signal to the rail. And controlling the vibration generator to convert the received electric signal into a vibration signal and transmitting the vibration signal to the steel rail. In this embodiment, the vibration generators may be arranged at the root of the point rail and on one side of the point rail, as shown in fig. 3.
(4) And converting the vibration signal into an electric signal. Controlling M vibration sensors corresponding to the vibration generators (one vibration sensor corresponds to receive a signal of one target vibration generator) to convert the received vibration signal into an electric signal and send the electric signal to a receiver, wherein M is an integer greater than 0. In this embodiment, the receiver may be connected to the plurality of vibration sensors, and processes the signals of the plurality of vibration sensors, respectively, and in this embodiment, the receiver receives the signals of different vibration sensors, and distinguishes different paths of vibration sensor signals according to different ports on a path connected to the receiver. In practice, a plurality of vibration sensor signals arranged at one switch can be transmitted to one receiver. In other embodiments, a group of vibration sensors controlled by the same generator may receive processed signals from multiple receivers, depending on implementation requirements, such as differences in track configuration, different types of vibration sensors, processing efficiency requirements, etc.
(5) And judging whether the steel rail is broken or not. And judging whether the rail is broken according to the received electric signals, namely comparing the received electric signals with the electric signals of the normal state of the steel rail by adopting a crack identification algorithm, and considering that the steel rail has a breakage fault when the received signals exceed a normally recorded threshold value. In this embodiment, the rail break determination is based on an average value of multiple measurement data, that is, a value obtained by performing window averaging on the received signal.
Furthermore, in this embodiment, the two switch rail signals are respectively compared with the corresponding normal records, so as to check or compensate for signal abnormality caused by environmental factors, such as rain, snow, and the like, and avoid false rail breakage. Specifically, the two switch rails have similar structures and are respectively in a state of being attached to a track and a state of being repelled away from the track, when the switch rails are in the two states, the key data values of the signals recorded normally respectively meet a certain threshold, when interference of rain and snow occurs, the key data value of the signal of the first switch rail-switch rail a may be an abnormal value, namely, the key data value exceeds the normal recording threshold of the state (attachment or repelled away) of the switch rail a at the moment, the key data value of the signal of the second switch rail-switch rail B needs to be referred to, and if the key data value of B also exceeds the normal recording threshold of the switch rail B closely, the signal deviation of the switch rails a and B is considered to be caused by environmental factors, so that the environments of the switch rails a and B are checked. Because the possibility that the switch rails A and B are broken simultaneously is low, and when signal deviation is caused by environmental factors, because the switch rails are similar in structure, the directions of the deviation (both are larger than or smaller than a normal recording threshold by a certain amount) are also similar, the signal of the two switch rails can be mutually referred, and the broken rail misjudgment caused by the environmental factors is reduced. In this embodiment, there are two execution manners for determining the rail break:
(a) in the embodiment, the two CPUs use two sets of codes to realize different fracture checking algorithms, so that the received data are analyzed and processed respectively, and the difference from the normal state is compared to obtain the judgment of whether the fracture occurs. Namely, the receiver adopts a framework design, the collected data are respectively calculated by an algorithm, and then the key data and the result are compared by double CPUs to obtain a final result. And when the comparison result is inconsistent, the receiver is considered to be in fault, and a fault report is sent to the control center. The two-out-of-two architecture can obviously reduce the false alarm times of the system and increase the robustness. The receiver sends the judgment result to the control center. The receiver CPU adopts polling processing to the received multipath signals, processes one signal in each polling period separately, and distributes data from different sensors in different polling periods. For example, the data collected for point a is calculated within 0.5s to yield the result, and the data for point B is calculated within the next 0.5 s. The receiver continuously receives the multi-channel signals, if a certain channel of signals is received each time, the signals are immediately processed, resource deficiency is easily caused, the multi-channel signals are processed through program control polling, and when each channel of signals is processed, the latest data of the channel of signals is obtained for calculation, so that the sufficient computing resources of the track-breaking identification algorithm can be ensured, and the efficiency and the stability of operation are improved.
(b) And the control receiver sends the received electric signal to the control center, and the control center judges whether the track is broken according to the electric signal. The control center can also adopt the two-out-of-two framework for analysis and judgment.
The method (a) is adopted for judgment, the real-time performance is high, a large amount of electric signal information transmission is not needed, the system burden of the control center is reduced, and particularly when the control center is connected with a plurality of receivers, each receiver can process independently, and the efficiency is higher. The judgment is carried out by adopting the mode (b), and the processor of the control center has better processing capability and expandability compared with an embedded receiver, and can store, count and analyze electric signals received for many times and processing results. In actual application, a proper processing mode is selected according to the control connection relation and the requirement.
Based on the same inventive concept, an embodiment of the present invention further provides a rail fracture inspection system, which mainly includes: a control center, at least one transmitter, at least one receiver, at least one vibration generator, at least one vibration sensor;
the control center is used for sending a vibration control command to the transmitter;
the transmitter is used for converting the vibration control command into an electric signal and transmitting the electric signal to the at least one vibration generator;
the vibration generator is used for converting the electric signal into a vibration signal and transmitting the vibration signal to the steel rail;
the vibration sensor is used for receiving vibration signals, converting the received vibration signals into electric signals and then sending the electric signals to the receiver;
the receiver is used for receiving the electric signal of at least one vibration sensor;
the receiver is also used for judging whether the track is broken according to the received electric signal and sending the judgment result to the control center;
the receiver can also send the received electric signal to a control center, and the control center judges whether the track is broken according to the electric signal;
specifically, whether the current steel rail has a fracture fault is judged through a pattern recognition algorithm.
As shown in fig. 2, the connection relationship between the various devices is shown by taking an example that only includes one transmitter, one receiver, one vibration generator and one vibration sensor; as shown in fig. 3, a schematic deployment of the system for detecting switch points and point rails using a rail break inspection system is shown, wherein the generator represents the vibration generator and the sensor represents the vibration sensor. The system will be described in detail with reference to fig. 1 and 3.
As shown in fig. 3, the system simultaneously implements detection of three rails: switch tongue A rail, switch tongue B rail, switch point rail. At the switch blade: the vibration generator is arranged at the root end of the switch rail, such as a generator 1 for detecting the switch rail A and a generator 2 for detecting the switch rail B in the figure; the vibration sensor is mounted at the point of the point, as shown by sensor 1 for detecting point a, and sensor 2 for detecting point B. At the point rail: the vibration generator and the vibration sensor are respectively arranged on two side edges of the point rail, such as the generator 3 and the sensor 3 in the figure. When the detection is carried out, the generator generates vibration waves, and after the corresponding receiver receives waves transmitted by the steel rail, the crack time domain frequency domain is analyzed to judge whether the section of the steel rail has cracks or breaks. The correspondence relationship (transmission-reception relationship) of the transmitters described above is: generator 1 corresponds to sensor 1, generator 2 corresponds to sensor 2, and generator 3 corresponds to sensor 3.
The system also comprises a power supply unit, a wireless communication network and a trackside equipment cabinet.
The power supply unit adopts a 220V-to-24V power supply module, and can also be replaced by a solar power supply module, so that the outdoor power supply requirement of a sunny area is met. The wireless communication network module establishes a wireless channel for the trackside detection equipment and the user server, and 4G transmission can be realized according to actual network conditions. According to the requirements of users, the wireless communication network can be selected to communicate with the control center through wired communication or wireless communication network. The receiver is provided with a reserved CAN and 485 communication interface for wired communication. If wireless communication is needed, as the wireless communication interface is reserved on the receiver, only the 4G communication antenna is needed to be installed outside the cabinet, and the 4G wireless communication module is additionally installed in the cabinet. The trackside equipment cabinet is used for installing a transmitter, a receiver, a power supply unit and a wireless communication module and protecting thunder and lightning, and the protection grade is not lower than IP 65. The trackside equipment cabinet adopts an expandable backboard design and is compatible with CAN, 485 and USB interfaces; according to different working condition requirements, indoor power supply, external solar panel power supply, wireless communication modules or wired communication interfaces can be selected respectively to be freely combined.
In the invention, the transmitter structure is as shown in fig. 4, double CPUs (a first processor and a second processor) receive commands according to a CAN bus, and a two-out-of-two framework is adopted; TMS320 is adopted by the two CPUs, the chip has strong anti-interference capability, the main frequency reaches 150MHz, and the high speed of the processor ensures the timely processing of tasks and events. The internal ROM space is 8KB, the RAM space is 36KB, and the FLASH space is 256 KB. And the system has abundant internal address space, and saves the external expansion of the system. And has rich IO expansion functions. The FPGA (Field-Programmable Gate Array) realizes modulation signals according to CPU instructions, sends frequency information generated by modulation to the double CPUs for inspection, and sends the frequency information passing the inspection to the filtering and amplifying circuit. Specifically, in this embodiment, the method of sending and retrieving modulation frequency information by using dual CPUs is as follows:
(1) two CPUs: the CPU1 (first processor of the transmitter) and the CPU2 (second processor of the transmitter) transmit the received vibration control instruction to the FPGA, respectively.
(2) And the FPGA modulates the two CPU instructions respectively to generate two modulation frequency information.
(3) The FPGA counts the two modulation frequency information respectively to obtain two frequency counting information: the periods of the low frequency and carrier frequency are counted separately and recorded by separate clocks.
(4) The two frequency count information are sent to one of the CPUs, i.e., the review processors such as CPU2, and CPU2 compares the received count information.
An SPI synchronous channel is arranged between the double CPUs, so that clock synchronization and data transmission between the double CPUs can be efficiently realized.
When the counting information of the double CPUs is inconsistent, the latest receiving signal is adopted for recalculation, and errors are reported when the counting information of the double CPUs is inconsistent continuously for a plurality of times (such as 3 times). And when the comparison result of the counting information is consistent, controlling the modulation signal to be sent to the filtering and amplifying circuit. In this embodiment, the amplifying circuit converts one path of signal into three paths of signals while realizing signal amplification, that is, one input loop corresponds to three output loops.
And the system reliability is improved by carrying out the return inspection after the frequency modulation of the double CPU instructions.
In this embodiment, the FPGA used is EP1C6Q240C8, produced by ALTRA corporation, which has 5980 logic cells (LEs); 92160 bit RAM space in total; 185 available I/Os. The transmitter adopts a signal amplifying circuit inside, and can realize the amplification output of the modulation signal. The transmitter comprises two paths of CAN communication circuits which are respectively communicated with the control center and unpacked and packaged according to protocol requirements, and the CAN bus has electrical isolation.
The functional structure of the receiver is shown in fig. 5, a dual-CPU comparison framework is adopted, analysis processing of received data is realized through two sets of codes, and the difference between the received data and the normal state is compared to judge whether a fracture occurs. And through a two-out-of-two framework, comparing the key data, including: the key data to be compared include: and acquiring the acquired low frequency, carrier frequency and amplitude, the averaged effective value, the rail break judgment result, the timestamp information and the like to obtain a final output result. By adopting the framework, the reliability of the system can be guaranteed, and the false alarm risk is reduced. Illustratively, the specific process of analyzing the received data by using the dual CPUs is as follows:
(1) the ADC1 collects the vibration signal and performs analog high-pass filtering on it before sending it to the CPU1 (first processor of the receiver); the ADC2 collects the vibration signal and performs analog high-pass filtering on it before sending it to the CPU2 (second processor of the receiver).
(2) And respectively carrying out digital filtering, window averaging and other processing on the received vibration signals by the CPU1 and the CPU2 to obtain key data, and carrying out crack detection calculation according to the key data. The dual CPUs adopt different digital filtering and crack detection algorithms to realize, calculate the deviation of the vibration signal from the vibration signal under normal conditions in time domain and frequency domain, and obtain the judgment result.
(3) The key data and the judgment result in the CPU1 are sent to the CPU2 through serial port communication between the double CPUs, and the CPU2 judges whether the information is consistent. And outputting a judgment result when the information is consistent. And when the information is inconsistent, recalculating, and when the information is inconsistent continuously for many times, outputting error report information.
Interaction, read-write control and comparison of the CPLD and the CPU are carried out on the information interaction peripheral circuit, and then an action command is controlled and output. The CPLD is used for realizing an extended IO interface. A control signal line is arranged between the CPLD and the ADC.
The TMS 320C 32 is adopted as the processor, the DSP chip is provided with a 32-bit high-performance floating-point CPU, the main frequency reaches 150MHZ, and the high-speed processing capacity of the processor improves the real-time performance of tasks. The receiver receives the collected signals of three vibration sensors on the A rail, the B rail and the point rail of the turnout respectively. The digital quantity after ADC is filtered and window averaged, and then the deviation between the time domain and the frequency domain of the digital quantity and the normal condition is calculated by applying a crack detection algorithm. And therefore have high requirements on hardware computing resources and speed. The CPLD chip uses Xilinx CPLD-XC95216-10PQ160, has low cost and high performance, can realize the interactive chip selection and read-write operation of a CPU and a peripheral circuit, and realizes the function of expanding an IO port. The CAN communication adopts a SJA1000 controller of PHILIPS company to realize data interaction with a control center. The AD acquisition uses an AD7865 chip with up to 4-channel synchronous sampling 14-bit AD converters.
The rail fracture detection method and the rail fracture detection system can simultaneously output signals to the multi-path steel rails by the one-path transmitter, all the received signals are connected to the one-path receiver, and the steel rail fracture detection algorithm is operated in the receiver to detect whether the multi-path steel rails are fractured in real time, so that the laying cost is saved, and the turnout structure can be comprehensively detected.
The cabinet type installation mode of adopting backplate formula design and reservation interface can be expanded, compatible good, can adopt different communication module, power module according to user's demand.
Due to the fact that the optimal working frequencies of the vibration generator and the vibration sensor are different, the transmitter requires a larger sampling bandwidth at the working frequency at the resonance point, and the receiver requires a larger sampling bandwidth. According to finite element simulation and experiment results, the frequency transmission effect of 20kHz and the performance on cracks are good, the transmitter selects a vibration generator with the resonance frequency of about 20K, and the output energy of the vibration generator at the frequency of 20K is much higher than that of other frequencies. For a sensor for receiving vibration, the required bandwidth is large, signals in a range from 2k to 60k can be received selectively, and acquisition of signals of different orders is facilitated during algorithm calculation. The transmission efficiency is obviously improved, the size of the receiving vibration sensor is reduced, and the field requirement is met.
The receiver adopts a two-out-of-two framework design, and respectively calculates the collected data by an algorithm to obtain a judgment result. And then, the key data and the result are compared by the double CPUs to obtain the final result. The false alarm times of the system are obviously reduced, and the robustness is improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A rail break inspection method, comprising:
controlling the transmitter to transmit electric signals to the N vibration generators; controlling the vibration generator to convert the electric signal into a vibration signal and transmitting the vibration signal to the steel rail;
controlling M vibration sensors corresponding to the vibration generator to convert the received vibration signals into electric signals and send the electric signals to a receiver;
judging whether the track is broken or not according to the electric signal;
arranging the N vibration generators on the track switch rail and the point rail so as to detect a plurality of components in the turnout area; at the switch blade: the vibration generator is arranged at the root end of the switch rail, and the vibration sensor is arranged at the tip end of the switch rail; at the point rail: the vibration generator and the vibration sensor are respectively arranged on two side edges of the point rail;
the control transmitter transmitting electrical signals to the N vibration generators includes:
the control transmitter converts one path of electric signal into N paths of amplified electric signals through the amplifying circuit, transmits the N paths of amplified electric signals to the N vibration generators, and achieves the purpose of preventing interference through signal modulation;
said disposing said N vibration generators on the rail point rail and the point rail comprises: arranging a first vibration generator on a first switch rail of a rail turnout; disposing a second vibration generator on a second point rail of the rail switch;
the receiver receives a first electric signal of a first vibration sensor corresponding to a first vibration generator;
the receiver receives a second electric signal of a second vibration sensor corresponding to a second vibration generator;
the judging whether the track is broken according to the electric signal comprises the following steps: comparing the first electric signal and the second electric signal with corresponding normal records respectively, and checking the signal abnormality caused by environmental factors;
the control receiver processes the received multipath signals in a polling mode, and processes one path of signal in each polling period;
the transmitter adopts double CPUs to transmit and return to check modulation frequency information:
the first processor CPU1 of the transmitter and the second processor CPU2 of the transmitter respectively transmit the received vibration control instruction to the FPGA;
the FPGA modulates the two CPU instructions respectively to generate two modulation frequency information;
the FPGA respectively counts the two modulation frequency information to obtain two frequency counting information: counting and recording the periods of low frequency and carrier frequency respectively through independent clocks;
sending the two frequency counting information to one CPU (Central processing Unit), namely a rechecking processor, and comparing the received counting information;
the receiver is set to be double CPUs which respectively adopt different algorithms to analyze and process the received electric signals;
and the analysis processing comprises comparing the difference between the electric signal and the normal state of the track and judging whether the track is broken.
2. The method of claim 1, wherein said determining whether the rail is broken according to the electrical signal comprises:
controlling the receiver to judge whether the track is broken according to the received electric signal and sending a judgment result to a control center;
and/or
And controlling the receiver to send the received electric signal to the control center, and judging whether the track is broken or not by the control center according to the electric signal.
3. A rail break inspection system, comprising:
the system comprises a control center, at least one transmitter, at least one receiver, a vibration generator and a vibration sensor;
the control center is used for sending a vibration control instruction to the transmitter;
the transmitter is used for converting the vibration control instruction into an electric signal and transmitting the electric signal to the vibration generator;
the vibration generator is used for converting the electric signal into a vibration signal and transmitting the vibration signal to the steel rail;
the vibration sensor is used for receiving the vibration signal, converting the received vibration signal into an electric signal and then sending the electric signal to the receiver;
the receiver is used for receiving the electric signal of the vibration sensor;
the receiver is also used for judging whether the track is broken according to the received electric signal and sending the judgment result to the control center;
arranging the vibration generators on the track switch rail and the point rail to detect a plurality of components in the turnout area; at the switch blade: the vibration generator is arranged at the root end of the switch rail, and the vibration sensor is arranged at the tip end of the switch rail; at the point rail: the vibration generator and the vibration sensor are respectively arranged on two side edges of the point rail;
wherein, the first vibration generator is arranged on a first switch rail of the track turnout; disposing a second vibration generator on a second point rail of the rail switch;
the receiver receives a first electric signal of a first vibration sensor corresponding to a first vibration generator;
the receiver receives a second electric signal of a second vibration sensor corresponding to a second vibration generator;
the judging whether the track is broken according to the electric signal comprises the following steps: comparing the first electric signal and the second electric signal with corresponding normal records respectively, and checking the signal abnormality caused by environmental factors;
the transmitter converts one path of electric signals into N paths of amplified electric signals through the amplifying circuit, transmits the N paths of amplified electric signals to the N vibration generators, and achieves the purpose of preventing interference through signal modulation, wherein N is an integer greater than 1;
the receiver processes the received multipath signals in a polling mode, and processes one path of signal in each polling period;
the transmitter comprises a first processor, a second processor and a field programmable gate array, wherein the first processor and the second processor are connected with the field programmable gate array;
the first processor and the second processor are used for sending the vibration control instruction to the field programmable gate array;
the field programmable gate array is used for modulating the vibration control instructions from the first processor and the second processor to generate two groups of modulation frequency information;
the field programmable gate array is further configured to count the two sets of modulation frequency information, and generate two sets of count information: counting and recording periods of low frequency and carrier frequency respectively through an independent clock, and sending the two groups of counting information to a rechecking processor, wherein the rechecking processor is the first processor or the second processor;
the rechecking processor compares and judges the two groups of counting information;
the receiver comprises a first processor and a second processor;
the first processor and the second processor are used for respectively receiving vibration signals;
the first processor and the second processor are respectively used for processing the received vibration signals to obtain respective key data for calculation;
the first processor and the second processor are respectively used for carrying out crack detection calculation according to the respective key data, and the first processor and the second processor adopt different algorithms to execute the crack detection calculation to obtain a judgment result;
the first processor is used for sending the key data and the judgment result thereof to the second processor; the second processor is used for comparing the key data of the first processor and the second processor with a judgment result.
4. The system of claim 3,
the receiver further comprises a back plate;
the backboard comprises a power supply module interface and a communication module interface;
the power supply module interface comprises a power supply interface and a solar power supply interface;
the communication module interface comprises CAN, 485 and USB interfaces.
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| CN201910538920.1A CN110329308B (en) | 2019-06-20 | 2019-06-20 | Track fracture inspection method and system |
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| KR102369916B1 (en) * | 2020-05-12 | 2022-03-04 | 한국철도기술연구원 | Rail fracture decision system and method for deciding rail fracture using the same |
| CN114715222B (en) * | 2021-01-04 | 2024-05-10 | 北京全路通信信号研究设计院集团有限公司 | Steel rail online detection method and system |
| CN112733407B (en) * | 2021-01-21 | 2024-01-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Simulation calculation method for switch tongue repulsive state line shape |
| CN112945372A (en) * | 2021-01-26 | 2021-06-11 | 深圳中慧轨道智能科技有限公司 | Sliding plate fracture monitoring devices |
| CN115384580B (en) * | 2021-05-24 | 2024-03-26 | 北京全路通信信号研究设计院集团有限公司 | Steel rail online detection method and system |
| CN115782956A (en) * | 2023-01-29 | 2023-03-14 | 北京全路通信信号研究设计院集团有限公司 | Steel rail fault monitoring method and device |
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