Train low-frequency magnetic field interference detection method and device

Abstract

The application provides a train low-frequency magnetic field interference detection method and device, the method comprises the following steps: acquiring the magnetic field intensity of the area where the train is located and the induced voltage generated by the first coil in the area when rotating; matching the corresponding relationship curve of the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage; wherein the relationship curve is the relationship curve under different frequencies in the preset low-frequency frequency band; determining whether the train is interfered by the low-frequency magnetic field according to whether the relationship curve is matched or not. The application improves the accuracy of train low-frequency magnetic field interference detection, reduces the detection cost and is simple to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, in particular to a train low-frequency magnetic field interference detection method and device. BACKGROUND

[0002] With the development of science and technology, the density of electronic and electrical equipment increases sharply, and the electromagnetic compatibility performance of system equipment is more and more important. As a modern transportation tool, the safe operation of the communication system of the subway is directly related to the personal safety of people.

[0003] It is found through testing that all electrical equipment in the subway and lightning in nature can become an interference source. They cause electromagnetic interference to the subway communication equipment in different frequency bands and different ways, resulting in damage to electronic components. The interference of low-frequency magnetic field is one of them.

[0004] At present, there are two common methods for detecting low-frequency magnetic field: one is a gauss meter, which uses a combination of a magnetic field sensor and a voltmeter to convert the magnetic field into voltage through the Hall effect; the other is to use a combination of a coil and a spectrum analyzer to effectively obtain the frequency spectrum of the magnetic field.

[0005] The gauss meter is a point test, and the test result is greatly affected by the probe. The values measured by gauss meters of different manufacturers are different, and the test data has a large divergence. The spectrum analyzer has a very high cost and a complex operation, and needs to be used with a signal generator. Moreover, it cannot accurately measure in the low-frequency band. SUMMARY

[0006] The present application provides a train low-frequency magnetic field interference detection method and device to solve the defects of inaccurate train low-frequency magnetic field interference detection, high detection cost and complex operation in the prior art, and to realize improving the accuracy of train low-frequency magnetic field interference detection, reducing the detection cost and simplifying the operation.

[0007] The present application provides a train low-frequency magnetic field interference detection method, comprising:

[0008] Obtaining the magnetic field intensity of the area where the train is located and the induced voltage generated by the first coil in the area when rotating;

[0009] Matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage; wherein the relationship curve is a relationship curve at different frequencies in a preset low-frequency band;

[0010] According to whether the relationship curve is matched, it is determined whether the train is interfered by the low-frequency magnetic field.

[0011] According to the train low-frequency magnetic field interference detection method provided by the application, the magnetic field intensity of the region and the corresponding relationship curve of the induced voltage of the first coil are matched from the relationship curve of the magnetic field intensity and the induced voltage, and the method comprises the following steps:

[0012] The induced voltage of the first coil is input into the relationship curve corresponding to different frequencies to obtain the magnetic field intensity output by the relationship curve;

[0013] The difference between the magnetic field intensity output by the relationship curve and the magnetic field intensity of the region is obtained;

[0014] If the difference is less than a first preset threshold, the relationship curve is taken as the relationship curve matched with the magnetic field intensity of the region and the induced voltage of the first coil.

[0015] According to the train low-frequency magnetic field interference detection method provided by the application, the magnetic field intensity of the region and the corresponding relationship curve of the induced voltage of the first coil are matched from the relationship curve of the magnetic field intensity and the induced voltage, and the method comprises the following steps:

[0016] A signal generator is used to generate current signals of different frequencies, and a power amplifier is used to amplify the current signals;

[0017] The amplified current signals are input into a second coil to generate a magnetic field, and the magnetic field intensity of the magnetic field is obtained;

[0018] The induced voltage generated by a third coil in the second coil when rotating is measured;

[0019] According to the magnetic field intensity of the magnetic field and the induced voltage of the third coil under different frequencies, the relationship curves under different frequencies obtained through experiments are determined;

[0020] According to the relationship curves under different frequencies obtained through experiments, the relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched.

[0021] According to the train low-frequency magnetic field interference detection method provided by the application, the magnetic field intensity of the region and the corresponding relationship curve of the induced voltage of the first coil are matched from the relationship curve of the magnetic field intensity and the induced voltage, and the method comprises the following steps:

[0022] The signal generator, the power amplifier, the second coil and the third coil are simulated by using simulation software;

[0023] According to the magnetic field intensity of the magnetic field and the induced voltage of the third coil under different frequencies in the simulation, the relationship curves under different frequencies obtained through simulation are determined;

[0024] According to the relationship curve of the magnetic field intensity of the region and the induced voltage of the first coil corresponding to the relationship curve obtained by experiments and simulation at different frequencies.

[0025] According to the train low-frequency magnetic field interference detection method provided by the application, the relationship curve of the magnetic field intensity of the region and the induced voltage of the first coil corresponding to the relationship curve obtained by experiments and simulation at different frequencies is matched.

[0026] The relationship curve at a frequency less than a second preset threshold is selected from the relationship curves obtained by experiments at different frequencies.

[0027] The relationship curve at a frequency greater than a third preset threshold is selected from the relationship curves obtained by simulation at different frequencies.

[0028] The relationship curve of the magnetic field intensity of the region and the induced voltage of the first coil corresponding to the relationship curve obtained by experiments and simulation at different frequencies is matched.

[0029] According to the train low-frequency magnetic field interference detection method provided by the application, the relationship curve of the magnetic field intensity of the region and the induced voltage of the first coil corresponding to the relationship curve obtained by experiments and simulation at different frequencies is matched.

[0030] The magnetic field intensity corresponding to the same induced voltage on the relationship curve at the same frequency obtained by experiments and simulation is averaged to obtain a new relationship curve at each frequency, wherein the frequency is greater than or equal to the second preset threshold and less than or equal to the third preset threshold.

[0031] The relationship curve of the magnetic field intensity of the region and the induced voltage of the first coil corresponding to the relationship curve is matched from the new relationship curve.

[0032] The application also provides a train low-frequency magnetic field interference detection device, which comprises:

[0033] The acquisition module is used to acquire the magnetic field intensity of the region where the train is located and the induced voltage generated by the first coil in the region when rotating.

[0034] The matching module is used to match the relationship curve of the magnetic field intensity of the region and the induced voltage of the first coil corresponding to the relationship curve of the magnetic field intensity and the induced voltage from the relationship curve, wherein the relationship curve is a relationship curve at different frequencies in a preset low-frequency frequency band.

[0035] The detection module is used to determine whether the train is interfered by a low-frequency magnetic field according to whether the relationship curve is matched.

[0036] The application further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the train low-frequency magnetic field interference detection method according to any one of the above when executing the program.

[0037] The application further provides a non-transitory computer readable storage medium, which stores a computer program, wherein the computer program is executable on a processor to implement the train low-frequency magnetic field interference detection method according to any one of the above.

[0038] The application further provides a computer program product, which comprises a computer program, wherein the computer program is executable on a processor to implement the train low-frequency magnetic field interference detection method according to any one of the above.

[0039] The train low-frequency magnetic field interference detection method and device provided by the application can improve the accuracy of train low-frequency magnetic field interference detection, and the device is simple, convenient to measure, and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0041] Figure 1 is one of the flowcharts of the train low-frequency magnetic field interference detection method provided by the application;

[0042] Figure 2 is a scene diagram of experimental measurement in the train low-frequency magnetic field interference detection method provided by the application;

[0043] Figure 3 is another flowchart of the train low-frequency magnetic field interference detection method provided by the application;

[0044] Figure 4 is a structural diagram of the train low-frequency magnetic field interference detection device provided by the application;

[0045] Figure 5 is a structural diagram of the electronic device provided by the application. DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] The present application will be described below in conjunction with Figure 1 A train low-frequency magnetic field interference detection method is described in the present application, comprising the following steps: step 101, obtaining the magnetic field intensity of the area where the train is located and the induced voltage generated by the first coil in the area when rotating;

[0048] The present embodiment needs to detect whether the environment around the train causes low-frequency magnetic field interference to the train. The area where the train is located is the position where the train is located, or the area defined with the train as the center.

[0049] Optionally, the magnetic field intensity of the area where the train is located is calculated by the Biot-Savart law, or the magnetic field intensity of the area where the train is located is tested by a magnetic field intensity tester.

[0050] By placing the first coil in the area where the train is located, the first coil is driven to rotate by the motor. The first coil cuts the magnetic field generated in the area where the train is located when rotating, and generates an induced voltage. The induced voltage generated by the coil is measured by connecting a multimeter to the first coil.

[0051] Step 102, matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage; wherein the relationship curve is the relationship curve under different frequencies in the preset low-frequency frequency band;

[0052] The preset low-frequency frequency band is determined according to the frequency range of the low-frequency magnetic field to be detected. Optionally, the preset low-frequency frequency band is a frequency band of 50Hz to 50kHz.

[0053] The magnetic field intensity and the induced voltage under different magnetic field frequencies are different. The relationship curve corresponding to each frequency is fitted according to the measured magnetic field intensity and induced voltage under each frequency in the preset low-frequency frequency band in advance. The relationship curves corresponding to different frequencies are different.

[0054] The relationship between the magnetic field intensity of the area where the train is located and the induced voltage of the first coil is determined to conform to which relationship curve, so as to perform relationship curve matching.

[0055] Step 103, determining whether the train is interfered by the low-frequency magnetic field according to whether the relationship curve is matched.

[0056] If the relationship curve is matched, it indicates that the magnetic field frequency in the area where the train is located is in the preset low frequency band range, and the train has low frequency magnetic field interference.

[0057] If the relationship curve is not matched, it indicates that the magnetic field frequency in the area where the train is located is not in the preset low frequency band range, and the train has no low frequency magnetic field interference.

[0058] In the embodiment, the coil is used as a magnetic field sensor to measure the induced voltage in the area where the train is located, the magnetic field intensity in the area where the train is located and the induced voltage are matched with the relationship curve of the magnetic field intensity and the induced voltage at different low frequencies, and it is determined whether there is a low frequency magnetic field in the area where the train is located, thereby improving the accuracy of train low frequency magnetic field interference detection, and the device is simple, convenient to measure and low in cost.

[0059] In the embodiment, the step of matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage includes: inputting the induced voltage of the first coil into the relationship curve corresponding to different frequencies to obtain the magnetic field intensity output by the relationship curve.

[0060] Since the relationship curve between the magnetic field intensity and the induced voltage obtained by fitting at the low frequency is approximately a straight line, the slopes of the relationship curves corresponding to different frequencies are different. The magnetic field intensity obtained by inputting the induced voltage of the first coil into the relationship curves corresponding to different frequencies is different.

[0061] The difference between the magnetic field intensity output by the relationship curve and the magnetic field intensity of the area is obtained, and if the difference is less than a first preset threshold, the relationship curve is taken as the relationship curve matched with the magnetic field intensity of the area and the induced voltage of the first coil.

[0062] The magnetic field intensity corresponding to the induced voltage of the first coil at different frequencies is compared with the actual magnetic field intensity in the area where the train is located. If the difference between the two is small, it indicates that the relationship between the magnetic field intensity in the area where the train is located and the induced voltage of the first coil conforms to the relationship curve at the corresponding frequency, and thus the matched relationship curve is obtained.

[0063] On the basis of the above embodiments, as shown in Figure 2 The step of matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage includes:

[0064] A signal generator is used to generate current signals at different frequencies, and a power amplifier is used to amplify the current signals.

[0065] The embodiment obtains the relationship curve at different frequencies through experimental measurement. First, the signal generator is adjusted to generate a current signal of a specific frequency. Then the current signal is amplified by the power amplifier. The frequency of the current signal adjusted by the signal generator is in the preset low frequency band.

[0066] The amplified current signal is input into the second coil to generate a magnetic field, and the magnetic field strength of the magnetic field is obtained.

[0067] The current signal amplified by the power amplifier is input into the coil to generate a magnetic field. Alternatively, the magnetic field strength at the center point of the second coil is calculated using the Biot-Savart law.

[0068] The induced voltage generated by the third coil in the second coil when rotating is measured.

[0069] The diameter of the third coil is smaller than that of the second coil, and the third coil is located in the second coil. Alternatively, the third coil is located at the center point of the second coil, that is, the centers of the third coil and the second coil coincide. The third coil cuts the magnetic field generated by the second coil when rotating to generate an induced voltage. The induced voltage generated by the third coil can be measured by using a multimeter.

[0070] Then, the frequency of the current signal output by the signal generator is changed, and the magnetic field strength and the induced voltage at other frequencies in the preset low frequency band are continuously measured.

[0071] According to the magnetic field strength of the magnetic field and the induced voltage of the third coil at different frequencies, the relationship curve at different frequencies obtained through experiments is determined.

[0072] According to the magnetic field strength and the induced voltage at each frequency obtained through experimental measurement, the relationship curve at each frequency is fitted.

[0073] According to the relationship curve at different frequencies obtained through experiments, the relationship curve corresponding to the magnetic field strength of the region and the induced voltage of the first coil is matched.

[0074] The relationship curve suitable for the relationship between the magnetic field strength of the region where the train is located and the induced voltage of the first coil is obtained by matching.

[0075] The embodiment uses a coil as a magnetic field sensor and a coil as a passive device, which is more convenient in actual application and has a larger measurement range. A multimeter is used to measure the voltage, which is low in cost and convenient to measure, and the measurement result is intuitive and accurate.

[0076] On the basis of the above-mentioned embodiments, in the embodiment, the relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched according to the relationship curves at different frequencies obtained through experiments, and the simulation software is used to simulate the signal generator, the power amplifier, the second coil and the third coil.

[0077] Since there is mutual inductance between the second coil and the third coil, the magnetic field intensity and the induced voltage measured through experiments may be inaccurate. The simulation software is used to build a model for the above-mentioned experimental measurement in the embodiment. The same current as that in the experimental measurement is input to perform simulation measurement.

[0078] In the simulation, the mutual inductance of the second coil and the third coil can be set to 0 or removed through calculation.

[0079] The relationship curves at different frequencies obtained through simulation are determined according to the magnetic field intensity of the magnetic field and the induced voltage of the third coil at different frequencies in the simulation.

[0080] The relationship curves at different frequencies are obtained by fitting the magnetic field intensity and the induced voltage at each frequency obtained through simulation measurement.

[0081] The relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched according to the relationship curves at different frequencies obtained through experiments and simulation.

[0082] Optionally, the relationship curves at the same frequency obtained through experiments and simulation are fused to obtain new relationship curves at each frequency. The relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched from the new relationship curves.

[0083] The embodiment combines experimental measurement and simulation measurement to improve the accuracy of the relationship curve between the magnetic field intensity and the induced voltage, thereby improving the precision of the train low-frequency magnetic field interference detection.

[0084] On the basis of the above-mentioned embodiments, in the embodiment, the relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched according to the relationship curves at different frequencies obtained through experiments and simulation, and the matching includes:

[0085] The relationship curve at a frequency less than a second preset threshold is selected from the relationship curves at different frequencies obtained through experiments;

[0086] The relationship curve at a frequency greater than a third preset threshold is selected from the relationship curves at different frequencies obtained through simulation; the second preset threshold is less than the third preset threshold.

[0087] From the selected relationship curves at different frequencies obtained through experiments and simulations, a relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched.

[0088] Optionally, the second preset threshold and the third preset threshold can be the same or different. The second preset threshold and the third preset threshold are determined according to the smoothness of the relationship curves at different frequencies obtained through experiments and simulations. For example, if the relationship curves at frequencies above 10 kHz in the relationship curves obtained through experiments have large fluctuations, the second preset threshold is set to 10 kHz.

[0089] The relationship curves obtained through experiments and the relationship curves obtained through simulations are spliced by frequency segments to obtain a final relationship curve.

[0090] For example, when the second preset threshold and the third preset threshold are 25 kHz, the relationship curve obtained through experiments at frequencies of 50 Hz to 25 kHz and the relationship curve obtained through simulations at frequencies of 25 kHz to 50 kHz are selected as the final relationship curve. A complete flowchart of train low-frequency magnetic field interference detection is shown in Figure 3 .

[0091] The embodiment combines experiments and simulations, adopts a segmented splicing manner, improves the accuracy of the relationship curve between the magnetic field intensity and the induced voltage, and thus improves the accuracy of train low-frequency magnetic field interference detection.

[0092] On the basis of the above embodiment, the embodiment matches the relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil according to the relationship curves at different frequencies obtained through experiments and simulations, including:

[0093] The magnetic field intensity corresponding to the same induced voltage on the relationship curve at the same frequency obtained through experiments and simulations is averaged to obtain a new relationship curve at each frequency; wherein the frequency is greater than or equal to the second preset threshold and less than or equal to the third preset threshold;

[0094] The relationship curve corresponding to the magnetic field intensity of the region and the induced voltage of the first coil is matched from the new relationship curve.

[0095] For the relationship curve between the second preset threshold and the third preset threshold in the relationship curves obtained through experiments and simulations, the relationship curves obtained through experiments and simulations at the same preset frequency are fused, that is, the magnetic field intensity corresponding to the same induced voltage in the two relationship curves is averaged, and the average value is taken as the magnetic field intensity corresponding to the induced voltage, so as to obtain a final relationship curve. The magnetic field intensity of the region where the train is located and the induced voltage of the first coil are matched with the final relationship curve.

[0096] The train low-frequency magnetic field interference detection device provided by the present application is described below, and the train low-frequency magnetic field interference detection device described below can be correspondingly referred to the train low-frequency magnetic field interference detection method described above.

[0097] As shown in Figure 4 The device includes an acquisition module 401, a matching module 402, and a detection module 403, wherein:

[0098] The acquisition module 401 is configured to acquire the magnetic field intensity of the area where the train is located and the induced voltage generated by the first coil in the area when rotating;

[0099] The matching module 402 is configured to match the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage; wherein the relationship curve is the relationship curve under different frequencies in the preset low-frequency frequency band;

[0100] The detection module 403 is configured to determine whether the train is interfered by the low-frequency magnetic field according to whether the relationship curve is matched.

[0101] In this embodiment, the coil is used as a magnetic field sensor and placed in the area where the train is located to measure the induced voltage. The magnetic field intensity in the area where the train is located and the induced voltage are matched with the relationship curve of the magnetic field intensity and the induced voltage under different low frequencies to determine whether there is a low-frequency magnetic field in the area where the train is located. The accuracy of the train low-frequency magnetic field interference detection is improved, the device is simple, the measurement is convenient, and the cost is low.

[0102] Figure 5 An example of an entity structure diagram of an electronic device is shown in Figure 5 The electronic device can include a processor 510, a communications interface 520, a memory 530, and a communications bus 540, wherein the processor 510, the communications interface 520, and the memory 530 can communicate with each other through the communications bus 540. The processor 510 can call the logic instructions in the memory 530 to execute the train low-frequency magnetic field interference detection method, which includes: acquiring the magnetic field intensity of the area where the train is located and the induced voltage generated by the first coil in the area when rotating; matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve of the magnetic field intensity and the induced voltage; wherein the relationship curve is the relationship curve under different frequencies in the preset low-frequency frequency band; and determining whether the train is interfered by the low-frequency magnetic field according to whether the relationship curve is matched.

[0103] In addition, the logic instructions in the memory 530 described above can be implemented in the form of software functional units and sold or used as independent products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0104] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and the computer program can be executed by a processor to enable a computer to execute the train low-frequency magnetic field interference detection method provided by the above-mentioned methods. The method comprises: acquiring the magnetic field intensity of an area where a train is located and the induced voltage generated by a first coil in the area when rotating; matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve between the magnetic field intensity and the induced voltage; wherein the relationship curve is a relationship curve under different frequencies in a preset low-frequency frequency band; and determining whether the train is interfered by a low-frequency magnetic field according to whether the relationship curve is matched.

[0105] In another aspect, the present application also provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the train low-frequency magnetic field interference detection method provided by the above-mentioned methods. The method comprises: acquiring the magnetic field intensity of an area where a train is located and the induced voltage generated by a first coil in the area when rotating; matching the relationship curve corresponding to the magnetic field intensity of the area and the induced voltage of the first coil from the relationship curve between the magnetic field intensity and the induced voltage; wherein the relationship curve is a relationship curve under different frequencies in a preset low-frequency frequency band; and determining whether the train is interfered by a low-frequency magnetic field according to whether the relationship curve is matched.

[0106] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0107] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0108] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting low-frequency magnetic field interference in trains, characterized in that, include: The magnetic field strength of the area where the train is located and the induced voltage generated by the first coil in the area when it rotates are obtained; From the relationship curve between magnetic field strength and induced voltage, match the relationship curve between the magnetic field strength of the region and the induced voltage of the first coil, including: The induced voltage of the first coil is input into the relationship curve corresponding to different frequencies to obtain the magnetic field strength output by the relationship curve; the difference between the magnetic field strength output by the relationship curve and the magnetic field strength of the region is obtained; if the difference is less than a first preset threshold, the relationship curve is used as the relationship curve that matches the magnetic field strength of the region and the induced voltage of the first coil. A signal generator is used to generate current signals of different frequencies, and a power amplifier is used to amplify the current signals. The amplified current signals are then passed into a second coil to generate a magnetic field, and the magnetic field strength is obtained. The induced voltage generated by a third coil within the second coil when it rotates is measured. Based on the magnetic field strength at different frequencies and the induced voltage of the third coil, the relationship curves obtained experimentally at different frequencies are determined. Based on the relationship curves obtained experimentally at different frequencies, the relationship curves corresponding to the magnetic field strength of the region and the induced voltage of the first coil are matched, including: The signal generator, power amplifier, second coil, and third coil are simulated using simulation software. Based on the magnetic field strength and induced voltage of the third coil at different frequencies in the simulation, the relationship curves at different frequencies obtained through simulation are determined. Based on the relationship curves at different frequencies obtained through experiments and simulation, the relationship curves corresponding to the magnetic field strength and induced voltage of the first coil in the region are matched. The relationship curves are relationship curves at different frequencies within a preset low-frequency band. Whether the train is affected by low-frequency magnetic field interference can be determined based on whether a relationship curve is matched.

2. The method for detecting low-frequency magnetic field interference in trains according to claim 1, characterized in that, The step of matching the relationship curves between the magnetic field strength of the region and the induced voltage of the first coil at different frequencies, obtained through experiments and simulations, includes: Select the relationship curve at a frequency lower than the second preset threshold from the relationship curves obtained through experiments at different frequencies; Select the relationship curve with a frequency greater than a third preset threshold from the relationship curves obtained through simulation at different frequencies; the second preset threshold is less than the third preset threshold. From the selected relationship curves obtained through experiments and simulations at different frequencies, match the relationship curves between the magnetic field strength of the region and the induced voltage of the first coil.

3. The method for detecting low-frequency magnetic field interference in trains according to claim 2, characterized in that, The step of matching the relationship curves between the magnetic field strength of the region and the induced voltage of the first coil at different frequencies, obtained through experiments and simulations, includes: The magnetic field strength corresponding to the same induced voltage on the relationship curves obtained through experiments and simulations at the same frequency is averaged to obtain a new relationship curve at each frequency; wherein the frequency is greater than or equal to the second preset threshold and less than or equal to the third preset threshold; Match the relationship curve between the magnetic field strength of the region and the induced voltage of the first coil from the new relationship curve.

4. A low-frequency magnetic field interference detection device for trains, characterized in that, include: The acquisition module is used to acquire the magnetic field strength of the area where the train is located and the induced voltage generated by the first coil in the area when it rotates; A matching module is used to match the relationship curve between the magnetic field strength of the region and the induced voltage of the first coil from the relationship curve between magnetic field strength and induced voltage, wherein the matching module includes: The induced voltage of the first coil is input into the relationship curve corresponding to different frequencies to obtain the magnetic field strength output by the relationship curve; the difference between the magnetic field strength output by the relationship curve and the magnetic field strength of the region is obtained; if the difference is less than a first preset threshold, the relationship curve is used as the relationship curve that matches the magnetic field strength of the region and the induced voltage of the first coil. A signal generator is used to generate current signals of different frequencies, and a power amplifier is used to amplify the current signals. The amplified current signals are then passed into a second coil to generate a magnetic field, and the magnetic field strength is obtained. The induced voltage generated by a third coil within the second coil when it rotates is measured. Based on the magnetic field strength at different frequencies and the induced voltage of the third coil, the relationship curves obtained experimentally at different frequencies are determined. Based on the relationship curves obtained experimentally at different frequencies, the relationship curves corresponding to the magnetic field strength of the region and the induced voltage of the first coil are matched, including: The signal generator, power amplifier, second coil, and third coil are simulated using simulation software. Based on the magnetic field strength and induced voltage of the third coil at different frequencies in the simulation, the relationship curves at different frequencies obtained through simulation are determined. Based on the relationship curves at different frequencies obtained through experiments and simulation, the relationship curves corresponding to the magnetic field strength and induced voltage of the first coil in the region are matched. The relationship curves are those at different frequencies within a preset low-frequency band. The detection module is used to determine whether the train is affected by low-frequency magnetic field interference based on whether a relationship curve is matched.

5. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the train low-frequency magnetic field interference detection method as described in any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the train low-frequency magnetic field interference detection method as described in any one of claims 1 to 3.

7. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the train low-frequency magnetic field interference detection method as described in any one of claims 1 to 3.

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