A subway line vibration reduction monitoring system and method based on grating array

Abstract

The present invention relates to a subway full-line vibration reduction monitoring system and method based on a grating array, which includes a grating array module, a signal processing module, a data operation module and a result analysis module that are electrically connected in sequence. The grating array module is arranged in a subway tunnel where a target track segment is located. The driving vibration signal of the target track segment is obtained through the grating array module, and then the vibration acceleration values ​​under multiple preset frequency ranges are obtained through the signal processing module according to the frequency domain characteristics of the driving vibration signal. Then, based on the data operation module, the vibration reduction value of the target track segment is obtained according to the vibration acceleration value under each preset frequency range. Finally, the result analysis module can be used to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value. Compared with the prior art, the grating array module of the present invention can be set throughout the entire subway tunnel, and a reasonable vibration monitoring and evaluation method is provided, so as to realize the monitoring of the vibration reduction effect of the subway full-line track.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail transit monitoring, and in particular to a subway full-line vibration reduction monitoring system and method based on a grating array. Background Art

[0002] Subways travel underground in cities, and complaints about noise disturbances from subway vehicles are common. Although vibration reduction measures have been added to the subway track system during design and construction, and even more advanced vibration reduction ballast structures have been used in some key areas, the vibration reduction effects of these vibration reduction measures and vibration reduction structures will gradually decrease or lose their vibration reduction functions after long-term rolling by subway trains. Therefore, it is necessary to install vibration reduction effect monitoring systems at various locations along the entire subway line to timely evaluate the vibration reduction effect status of the vibration reduction structure.

[0003] However, traditional electrical sensor devices are mainly based on "point-type" monitoring, which is susceptible to electromagnetic interference, has poor accuracy, and has a short signal transmission distance in underground environments, making it difficult to achieve full-time and full-domain monitoring of tracks. Therefore, there is currently no available full-line vibration reduction effect monitoring and evaluation system in the domestic rail transit field.

[0004] Grating array technology has the advantages of anti-electromagnetic interference, high sensitivity, long-distance transmission and multiplexing, and can realize long-distance, large-range and high-precision vibration monitoring. Therefore, how to use grating array technology to monitor the vibration reduction effect of the entire line of rail transit has become an urgent need. Summary of the invention

[0005] In view of this, it is necessary to provide a subway full-line vibration reduction monitoring system and method based on a grating array, so as to realize the monitoring of the vibration reduction effect of the subway full-line track using the grating array technology.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a subway full-line vibration reduction monitoring system based on a grating array, comprising a grating array module, a signal processing module, a data operation module and a result analysis module electrically connected in sequence, wherein the grating array module is arranged in a subway tunnel where a target track segment is located, wherein:

[0008] The grating array module is used to obtain the driving vibration signal of the target track segment;

[0009] The signal processing module is used to obtain vibration acceleration values ​​under multiple preset frequency ranges according to the frequency domain characteristics of the vehicle vibration signal;

[0010] The data calculation module is used to obtain the vibration reduction value of the target track segment according to the vibration acceleration value under each preset frequency range;

[0011] The result analysis module is used to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value.

[0012] Furthermore, the grating array module includes at least two sensing optical cables and multiple grating sensors, one of the sensing optical cables is laid on the roadbed in the subway tunnel along the extension direction of the subway tunnel, and the other sensing optical cable is laid on the side wall of the subway tunnel along the extension direction of the subway tunnel, and the multiple grating sensors are electrically connected to the sensing optical cables.

[0013] In a second aspect, the present invention further provides a subway full-line vibration reduction detection method based on a grating array, which is applied to the above-mentioned subway full-line vibration reduction monitoring system based on a grating array, and the method comprises:

[0014] Acquiring a driving vibration signal of the target track segment;

[0015] According to the frequency domain characteristics of the driving vibration signal, vibration acceleration values ​​under multiple preset frequency ranges are obtained;

[0016] Obtaining a vibration reduction value of the target track segment according to the vibration acceleration value at each preset frequency range;

[0017] According to the vibration reduction value, a vibration reduction monitoring result of the target track segment is obtained.

[0018] Furthermore, the vibration acceleration values ​​under a plurality of preset frequency ranges are obtained according to the frequency domain characteristics of the driving vibration signal, including:

[0019] According to the vibration signal, obtaining a frequency spectrum of the vibration signal;

[0020] Based on the octave of the preset center frequency, dividing the spectrum graph into a plurality of preset frequency ranges;

[0021] The vibration acceleration value at each preset frequency range is obtained according to the root mean square value of the amplitude value in each preset frequency range in the spectrum diagram.

[0022] Furthermore, obtaining the vibration reduction value of the target track segment according to the vibration acceleration value at each preset frequency range includes:

[0023] According to the vibration acceleration value, obtaining the acceleration level value under each of the preset frequency ranges;

[0024] The vibration reduction value of the target track segment is obtained according to the acceleration level value under each preset frequency range.

[0025] Furthermore, the formula for obtaining the acceleration level value under each preset frequency range according to the vibration acceleration value is:

[0026]

[0027] In the formula, a(f i ) is the preset center frequency f in the i-th i The vibration acceleration value under the corresponding preset frequency range, a0 is the reference acceleration, VAL(fi i ) is the preset center frequency fi at the i-th i The acceleration level value under the corresponding preset frequency range.

[0028] Furthermore, the target track segment includes sub-track segments with multiple different track bed structures; the vibration signal includes a track side vibration signal and a tunnel wall side vibration signal; the track side vibration signal includes a plurality of track side sub-area vibration signals corresponding to each of the sub-track segments, and the tunnel wall side vibration signal includes a plurality of tunnel wall side sub-area vibration signals corresponding to each of the sub-track segments; the vibration acceleration value includes a plurality of track side sub-area vibration acceleration values ​​corresponding to each track side sub-area vibration signal, and a plurality of tunnel wall side sub-area vibration acceleration values ​​corresponding to each tunnel wall side sub-area vibration signal.

[0029] Furthermore, obtaining the acceleration level value under each preset frequency range according to the vibration acceleration value includes:

[0030] According to the vibration acceleration value of the track side sub-area, obtaining the vibration acceleration level value of the track side sub-area under each of the preset frequency ranges;

[0031] According to the tunnel wall side sub-area vibration acceleration value, the tunnel wall side sub-area vibration acceleration level value in each of the preset frequency ranges is obtained.

[0032] Furthermore, obtaining the vibration reduction value of the target track segment according to the acceleration level value under each of the preset frequency ranges includes:

[0033] The vibration reduction value of the target track segment is obtained based on the difference relationship between the vibration acceleration level values ​​of the track side sub-areas corresponding to different sub-track segments under each of the preset frequency ranges, and the difference relationship between the vibration acceleration level values ​​of the tunnel wall side sub-areas corresponding to different sub-track segments.

[0034] Furthermore, the multiple sub-track segments include steel spring floating plate track segments and integral track segments. According to the difference relationship between the vibration acceleration level values ​​of the track side sub-areas corresponding to different sub-track segments under each preset frequency range, and the difference relationship between the vibration acceleration level values ​​of the tunnel wall side sub-areas corresponding to different sub-track segments, the formula for obtaining the vibration reduction value of the target track segment is:

[0035]

[0036] Where V L,m,t,i is the preset center frequency f at the i-th i V is the vibration acceleration level value of the track side sub-area based on the track side t corresponding to the steel spring floating plate track section m under the corresponding preset frequency range; L,n,c,i is the preset center frequency f at the i-th i The vibration acceleration level value of the tunnel wall side sub-area based on the tunnel wall side c corresponding to the integral track section n under the corresponding preset frequency range; z is the total number of the preset center frequencies; ΔV L is the vibration reduction value.

[0037] The present invention provides a subway full-line vibration reduction monitoring system and method based on a grating array, which obtains the driving vibration signal of the target track segment through a grating array module, and then obtains the vibration acceleration values ​​under multiple preset frequency ranges according to the frequency domain characteristics of the driving vibration signal through a signal processing module, and then obtains the vibration reduction value of the target track segment according to the vibration acceleration value under each preset frequency range based on a data operation module, and finally can use a result analysis module to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value. Compared with the prior art, the grating array module of the present invention can be set up throughout the entire subway tunnel, and a reasonable vibration monitoring and evaluation method based on vibration signals is given in combination with the vibration acceleration value and the vibration reduction value, which realizes the monitoring of the vibration reduction effect of the entire subway line track, achieves the purpose of full-time and full-domain monitoring, and provides more convenient information services for railway monitoring work. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of an embodiment of a subway line vibration reduction monitoring system based on a grating array provided by the present invention;

[0039] Figure 2 A schematic diagram of laying sensor optical cables in an embodiment of a subway full-line vibration reduction monitoring system based on a grating array provided by the present invention;

[0040] Figure 3 A method flow chart of an embodiment of a subway line vibration reduction monitoring method based on a grating array provided by the present invention;

[0041] Figure 4 for Figure 3 A method flow chart of an embodiment of step S302;

[0042] Figure 5 for Figure 3 Flow chart of a method of an embodiment of step S303. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0044] In the description of the present application, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The present invention provides a reasonable vibration monitoring and evaluation method based on vibration signals by combining the vibration acceleration value and the vibration reduction value through the grating array module set throughout the entire subway tunnel, thereby realizing full-time and full-domain monitoring of the vibration reduction effect of the entire subway line track.

[0047] The present invention provides a subway full-line vibration reduction monitoring system based on a grating array and a subway full-line vibration reduction monitoring method based on a grating array, which are respectively described below.

[0048] Combination Figure 1 As shown, a specific embodiment of the present invention discloses a subway full-line vibration reduction monitoring system based on a grating array, comprising a grating array module 110, a signal processing module 120, a data operation module 130 and a result analysis module 140 electrically connected in sequence, wherein the grating array module 110 is arranged in a subway tunnel where a target track segment is located, wherein:

[0049] The grating array module 110 is used to obtain the vehicle vibration signal of the target track segment;

[0050] The signal processing module 120 is used to obtain vibration acceleration values ​​under multiple preset frequency ranges according to the frequency domain characteristics of the vehicle vibration signal;

[0051] The data calculation module 130 is used to obtain the vibration reduction value of the target track segment according to the vibration acceleration value in each preset frequency range;

[0052] The result analysis module 140 is used to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value.

[0053] The present invention provides a subway full-line vibration reduction monitoring system based on a grating array. The grating array module 110 obtains the driving vibration signal of the target track segment, and then obtains the vibration acceleration values ​​under multiple preset frequency ranges according to the frequency domain characteristics of the driving vibration signal through the signal processing module 120. Then, based on the vibration acceleration value under each preset frequency range, the vibration reduction value of the target track segment is obtained based on the data operation module 130. Finally, the result analysis module 140 can be used to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value. Compared with the prior art, the grating array module 110 of the present invention can be set up throughout the entire subway tunnel, and a reasonable vibration monitoring and evaluation method based on the vibration signal is given in combination with the vibration acceleration value and the vibration reduction value, so as to realize the monitoring of the vibration reduction effect of the entire subway line track, achieve the purpose of full-time and full-domain monitoring, and provide more convenient information services for railway monitoring work.

[0054] Combination Figure 2 As shown, as a preferred embodiment, the grating array module 110 in this embodiment includes at least two sensor optical cables (i.e. Figure 2 The sensing optical cable is laid on the roadbed in the subway tunnel along the extension direction of the subway tunnel (i.e. Figure 2 The straight line where point B is located in the middle, in this embodiment, it is set between the two tracks, and in practice it can also be installed at other positions near the roadbed), and the other sensing optical cable is laid on the side wall of the subway tunnel along the extension direction of the subway tunnel (that is, Figure 2 The plurality of grating sensors are electrically connected to the sensing optical cable and are equidistantly arranged on the sensing optical cable (it is understood that in practice, the arrangement positions of the grating sensors may be different from those in the present embodiment depending on the specific types of the grating sensors used). It is understood that in practice, the plurality of sensing optical cables may also be arranged at other positions in the tunnel according to specific circumstances.

[0055] Specifically, the grating sensor in this embodiment is a UWFBG (ultra weak light grating) sensor, which is arranged on the sensing optical cable every five meters, that is, the spatial resolution of the sensor is five meters, and the sensor on one side of the track corresponds to the sensor on the tunnel wall one by one.

[0056] In order to better implement the subway full line vibration reduction monitoring system based on grating array in the embodiment of the present invention, on the basis of the subway full line vibration reduction monitoring system based on grating array, correspondingly, please refer to Figure 3 , Figure 3 A method flow chart of an embodiment of a subway full-line vibration reduction monitoring method based on a grating array provided by the present invention. A subway full-line vibration reduction monitoring method based on a grating array provided by an embodiment of the present invention comprises:

[0057] S301, obtaining a driving vibration signal of the target track segment;

[0058] S302, obtaining vibration acceleration values ​​under a plurality of preset frequency ranges according to the frequency domain characteristics of the vehicle vibration signal;

[0059] S303, obtaining a vibration reduction value of the target track segment according to the vibration acceleration value in each preset frequency range;

[0060] S304: Obtain a vibration reduction monitoring result of the target track segment according to the vibration reduction value.

[0061] In practice, under the same track, the structure of the track bed may be different, that is, the target track segment includes sub-track segments with multiple different track bed structures. Therefore, in step S301 of the above process, the vibration signal includes a track side vibration signal and a tunnel wall side vibration signal, which are respectively acquired through the grating sensor modules on the two sensing optical cables; the track side vibration signal includes multiple track side sub-area vibration signals corresponding to each of the sub-track segments, and the tunnel wall side vibration signal includes multiple tunnel wall side sub-area vibration signals corresponding to each of the sub-track segments.

[0062] As a preferred embodiment, the various sub-track segments in this embodiment include steel spring floating plate track segments and integral track segments, so the track side sub-area vibration signal and the tunnel wall side sub-area vibration signal also include two signals, which correspond to the steel spring floating plate track segment and the integral track segment. The collected signals can be transmitted to the big data center through a modem and a switch for storage so as to carry out subsequent steps.

[0063] Combination Figure 4 As shown, in a preferred embodiment, the above step S302, according to the frequency domain characteristics of the driving vibration signal, obtains the vibration acceleration values ​​under multiple preset frequency ranges, specifically including:

[0064] S401, obtaining a frequency spectrum of the vibration signal according to the vibration signal;

[0065] S402, dividing the spectrum diagram into a plurality of preset frequency ranges based on the octave of the preset center frequency;

[0066] S403 , obtaining the vibration acceleration value in each of the preset frequency ranges according to the root mean square value of the amplitude value in each of the preset frequency ranges in the spectrum diagram.

[0067] In a more preferred embodiment, the preset center frequency is selected from relevant national standards, and the preset frequency bands are divided based on one-third octave bands, and the root mean square value (RMS) of the amplitude value in each preset frequency band in the spectrum diagram is directly used as the vibration acceleration value.

[0068] It can be understood that, for the track side sub-area vibration signals and tunnel wall side sub-area vibration signals in the above embodiments, the track side sub-area vibration acceleration values ​​corresponding to each track side sub-area vibration signal and multiple tunnel wall side sub-area vibration acceleration values ​​corresponding to each tunnel wall side sub-area vibration signal can also be calculated based on the above steps.

[0069] Further, combined with Figure 5 As shown, as a preferred embodiment, the above step S303, obtaining the vibration reduction value of the target track segment according to the vibration acceleration value under each preset frequency range, specifically includes:

[0070] S501, obtaining the acceleration level value under each of the preset frequency ranges according to the vibration acceleration value;

[0071] S502: Obtain a vibration reduction value of the target track segment according to the acceleration level value at each of the preset frequency ranges.

[0072] Specifically, in a preferred embodiment, the calculation formula of the above step S501 is as follows:

[0073]

[0074] In the formula, a(fi i ) is the preset center frequency fi at the i-th i The vibration acceleration value under the corresponding preset frequency range, a0 is the reference acceleration, and in this embodiment, a0=10 -6 m / 2 , VAL(fi i ) is the preset center frequency fi at the i-th i The acceleration level value under the corresponding preset frequency range.

[0075] Because there are multiple vibration acceleration values ​​in this embodiment, in a preferred embodiment, the above step S501 specifically includes:

[0076] According to the vibration acceleration value of the track side sub-area, obtaining the vibration acceleration level value of the track side sub-area under each of the preset frequency ranges;

[0077] According to the tunnel wall side sub-area vibration acceleration value, the tunnel wall side sub-area vibration acceleration level value in each of the preset frequency ranges is obtained.

[0078] Through the above process, the acceleration level values ​​finally obtained in this embodiment are four kinds, namely, the vibration acceleration level value of the track side sub-area on one side of the track corresponding to the steel spring floating plate track section, the vibration acceleration level value of the tunnel wall side sub-area on one side of the tunnel wall corresponding to the steel spring floating plate track section, the vibration acceleration level value of the track side sub-area on one side of the track corresponding to the integral track section, and the vibration acceleration level value of the tunnel wall side sub-area on one side of the tunnel wall corresponding to the integral track section.

[0079] Further, as a preferred embodiment, step S502 in the above process, obtaining the vibration reduction value of the target track segment according to the acceleration level value under each of the preset frequency ranges, specifically includes:

[0080] The vibration reduction value of the target track segment is obtained based on the difference relationship between the vibration acceleration level values ​​of the track side sub-areas corresponding to different sub-track segments under each of the preset frequency ranges, and the difference relationship between the vibration acceleration level values ​​of the tunnel wall side sub-areas corresponding to different sub-track segments.

[0081] Specifically, in a preferred embodiment, the above step: according to the difference relationship between the vibration acceleration level values ​​of the track side sub-area corresponding to different sub-track segments under each of the preset frequency ranges, and the difference relationship between the vibration acceleration level values ​​of the tunnel wall side sub-area corresponding to different sub-track segments, the formula for obtaining the vibration reduction value of the target track segment is:

[0082]

[0083] Where V L,m,t,i is the preset center frequency fi at the i-th i V is the vibration acceleration level value of the track side sub-area based on the track side t corresponding to the steel spring floating plate track section m under the corresponding preset frequency range; L,m,c,i is the preset center frequency fi at the i-th i The vibration acceleration level value of the track side sub-area based on the tunnel wall side c corresponding to the steel spring floating plate track section m under the corresponding preset frequency range; V L,n,t,i is the preset center frequency fi at the i-th i V is the vibration acceleration level value of the tunnel wall side sub-area based on the track side t corresponding to the integral track section n under the corresponding preset frequency range; L,n,c,iis the preset center frequency fi at the i-th i The vibration acceleration level value of the tunnel wall side sub-area based on the tunnel wall side c corresponding to the integral track section n under the corresponding preset frequency range; the subscript L is a superscript identifying the meaning of the formula and has no actual physical meaning; z is the total number of the preset center frequencies; ΔV L is the vibration reduction value.

[0084] After calculating the vibration reduction value of the target track segment, the vibration reduction situation of the railway can be analyzed according to the vibration reduction value to obtain the vibration reduction monitoring result, that is, step S304 is performed. For example, when the vibration reduction value exceeds the set threshold, it can be considered that the target track segment has corrosion, looseness and other problems, and relevant personnel can be arranged to repair it. In practice, the specific analysis and use of the vibration reduction value data varies according to different actual needs, and any existing analysis method can be used to analyze the vibration reduction value.

[0085] In a preferred embodiment, the vibration signals of all target track sections of the railway are obtained through the above steps, and the vibration reduction values ​​of the global measurement points are obtained. The results are as follows:

[0086] Table 1: Statistical characteristics of monitoring range and vibration reduction values ​​in the entire line area

[0087]

[0088] The instrument number in Table 1 can be understood as the number corresponding to each target track section. The vibration reduction area and the non-vibration reduction area can be understood as two different roadbed structures. Through the above vibration reduction value data, it can be found that whether it is a typical measuring point or all measuring points on the entire line, its time-frequency and correlation characteristics are regularly distributed and the monitoring error range is small. The stable characteristics of the vibration reduction value trend changes in the vibration reduction measuring area and the non-vibration reduction measuring area verify the feasibility and rationality of the present invention.

[0089] The beneficial effects that can be achieved by the embodiments of the present invention are as follows:

[0090] (1) Solve the defects of traditional electrical sensors in subway track monitoring, such as easy corrosion, severe electromagnetic interference, and high maintenance costs.

[0091] (2) To solve the problem of traditional single-point monitoring, the grating array technology is adopted, relying on the sensor optical cable running through the entire subway line to achieve the purpose of full-time and full-area monitoring.

[0092] (3) Based on long-term monitoring data, a reasonable vibration assessment method is adopted to timely locate abnormal measurement points and provide information services for railway safety.

[0093] The present invention provides a subway full-line vibration reduction monitoring system and method based on a grating array, which obtains the driving vibration signal of the target track segment through a grating array module, and then obtains the vibration acceleration values ​​under multiple preset frequency ranges according to the frequency domain characteristics of the driving vibration signal through a signal processing module, and then obtains the vibration reduction value of the target track segment according to the vibration acceleration value under each preset frequency range based on a data operation module, and finally can use a result analysis module to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value. Compared with the prior art, the grating array module of the present invention can be set up throughout the entire subway tunnel, and a reasonable vibration monitoring and evaluation method based on vibration signals is given in combination with the vibration acceleration value and the vibration reduction value, which realizes the monitoring of the vibration reduction effect of the entire subway line track, achieves the purpose of full-time and full-domain monitoring, and provides more convenient information services for railway monitoring work.

[0094] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A subway line vibration reduction monitoring system based on grating array, characterized in that: It includes a grating array module, a signal processing module, a data operation module and a result analysis module which are electrically connected in sequence, and the grating array module is arranged in a subway tunnel where the target track segment is located, wherein: The grating array module is used to obtain the driving vibration signal of the target track segment; The signal processing module is used to obtain vibration acceleration values ​​under multiple preset frequency ranges according to the frequency domain characteristics of the vehicle vibration signal; The data operation module is used to obtain the vibration reduction value of the target track segment according to the vibration acceleration value under each preset frequency range; the vibration reduction value of the target track segment according to the vibration acceleration value under each preset frequency range is obtained, including: According to the vibration acceleration value, obtaining the acceleration level value under each of the preset frequency ranges; Obtaining a vibration reduction value of the target track segment according to the acceleration level value under each of the preset frequency ranges; The target track segment includes sub-track segments with multiple different track bed structures; the vibration signal includes a track side vibration signal and a tunnel wall side vibration signal; the track side vibration signal includes a plurality of track side sub-area vibration signals corresponding to each of the sub-track segments, and the tunnel wall side vibration signal includes a plurality of tunnel wall side sub-area vibration signals corresponding to each of the sub-track segments; the vibration acceleration value includes a plurality of track side sub-area vibration acceleration values ​​corresponding to each track side sub-area vibration signal, and a plurality of tunnel wall side sub-area vibration acceleration values ​​corresponding to each tunnel wall side sub-area vibration signal; The result analysis module is used to obtain the vibration reduction monitoring result of the target track segment according to the vibration reduction value; The step of obtaining the acceleration level value at each preset frequency range according to the vibration acceleration value includes: According to the vibration acceleration value of the track side sub-area, obtaining the vibration acceleration level value of the track side sub-area under each of the preset frequency ranges; According to the tunnel wall side sub-area vibration acceleration value, obtaining the tunnel wall side sub-area vibration acceleration level value under each of the preset frequency ranges; The step of obtaining the vibration reduction value of the target track segment according to the acceleration level value under each of the preset frequency ranges includes: According to the difference relationship between the vibration acceleration level values ​​of the track side sub-areas corresponding to different sub-track segments under each of the preset frequency ranges, and the difference relationship between the vibration acceleration level values ​​of the tunnel wall side sub-areas corresponding to different sub-track segments, the vibration reduction value of the target track segment is obtained; The multiple sub-track segments include steel spring floating plate track segments and integral track segments. According to the difference relationship between the vibration acceleration level values ​​of the track side sub-areas corresponding to different sub-track segments under each preset frequency range, and the difference relationship between the vibration acceleration level values ​​of the tunnel wall side sub-areas corresponding to different sub-track segments, the formula for obtaining the vibration reduction value of the target track segment is: In the formula, For the i Preset center frequencies Under the corresponding preset frequency range, the steel spring floating plate track section m Correspondingly, based on the track side t The vibration acceleration level value of the track side sub-area; For the i Preset center frequencies Under the corresponding preset frequency range, the integral track section n Correspondingly, based on the tunnel wall side c The vibration acceleration level value of the tunnel wall side sub-area; z is the total number of the preset center frequencies; is the vibration reduction value; For the i Preset center frequencies Under the corresponding preset frequency range, the steel spring floating plate track section m Correspondingly, based on the tunnel wall side c The vibration acceleration level value of the track side sub-area; For the i Preset center frequencies Under the corresponding preset frequency range, the integral track section n Correspondingly, based on the track side t The vibration acceleration level value of the tunnel wall side sub-area.

2. The subway full-line vibration reduction monitoring system based on grating array according to claim 1 is characterized in that: The grating array module includes at least two sensing optical cables and multiple grating sensors, one of the sensing optical cables is laid on the roadbed in the subway tunnel along the extension direction of the subway tunnel, and the other sensing optical cable is laid on the side wall of the subway tunnel along the extension direction of the subway tunnel, and the multiple grating sensors are electrically connected to the sensing optical cables.

3. A subway full-line vibration reduction detection method based on a grating array, applied to the subway full-line vibration reduction monitoring system based on a grating array as claimed in claim 2, characterized in that: The method comprises: Acquiring a driving vibration signal of the target track segment; According to the frequency domain characteristics of the driving vibration signal, vibration acceleration values ​​under multiple preset frequency ranges are obtained; Obtaining a vibration reduction value of the target track segment according to the vibration acceleration value at each preset frequency range; According to the vibration reduction value, a vibration reduction monitoring result of the target track segment is obtained.

4. The method for monitoring vibration reduction of the entire subway line based on a grating array according to claim 3 is characterized in that: The step of obtaining vibration acceleration values ​​under a plurality of preset frequency ranges according to the frequency domain characteristics of the driving vibration signal includes: According to the vibration signal, obtaining a frequency spectrum of the vibration signal; Based on the octave of the preset center frequency, dividing the spectrum graph into a plurality of preset frequency ranges; The vibration acceleration value at each preset frequency range is obtained according to the root mean square value of the amplitude value in each preset frequency range in the spectrum diagram.

5. The method for monitoring vibration reduction of the entire subway line based on a grating array according to claim 3 is characterized in that: The formula for obtaining the acceleration level value under each preset frequency range according to the vibration acceleration value is: In the formula, For the i The preset center frequency The corresponding vibration acceleration value under the preset frequency range, is the reference acceleration, For the i The preset center frequency The acceleration level value under the corresponding preset frequency range.

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