Well lid transaction monitoring module and method

Abstract

The invention discloses a manhole cover transaction monitoring module and a manhole cover transaction monitoring method, which relate to the technical field of computer remote monitoring and are used for collecting construction records of movable manhole covers in a target area, collecting the sequence of the movable manhole covers in each construction record and obtaining tools meeting related construction specifications. Recording vibration generated by the well lids in the process that related workers use the tool to move the well lids to obtain a vibration reference function, forming a target well lid sequence by the well lids moving in the monitoring time period, recording the target well lid sequence in the well lid moving database as a reference sequence, and recording the target well lid sequence in the well lid moving database as the reference sequence; calculating the difference degree between the target sequence and the reference sequence, dividing the target sequence into a part coinciding with the reference sequence and a part not coinciding with the reference sequence, respectively obtaining vibration characteristic functions, and when the similarity between the vibration characteristic function of the coinciding part and the vibration reference function is smaller than the similarity between the vibration characteristic function of the non-coinciding part and the vibration characteristic function of the non-coinciding part, determining that the target sequence is a vibration sequence. And a manhole cover abnormal movement prompt is sent to a manhole cover manager.

Description

Technical Field

[0001] The present invention relates to the technical field of computer remote monitoring, and specifically to a manhole cover movement monitoring module and method. Background Art

[0002] During the urban construction process, many pipelines are buried underground in the city. To facilitate maintenance and management, special manholes are set up to enable management personnel to maintain the underground pipelines. The manhole cover not only protects the underground pipelines, but also protects pedestrians or vehicles on the road surface from falling into the manhole, thereby causing personal injuries. With the expansion of the urban scale, the number of manhole covers in the city is huge. If the method of personnel inspection is used to check the manhole covers, the efficiency is low. Although there are methods for monitoring manhole covers through wireless sensors in the prior art, it can only monitor whether the manhole cover is opened, and cannot distinguish whether the manhole cover is opened under normal maintenance operations or by abnormal means. Therefore, the monitoring is not targeted enough. Summary of the Invention

[0003] The purpose of the present invention is to provide a manhole cover movement monitoring module and method to solve the problems raised in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solution, a manhole cover movement monitoring method, the method includes: Step S100: Set an area including several manhole covers as a target area. Several manhole covers are provided with wireless monitoring sensors. Collect the construction records of the moving manhole covers in the target area, and gather the sequence of the moving manhole covers in each construction record to obtain a manhole cover movement database; Step S200: Obtain the tools that comply with the relevant construction specifications during the operation of moving the manhole cover. Record the vibration generated by the manhole cover during the process of relevant staff moving the manhole cover with the tools to obtain a vibration reference function; Step S300: Set a monitoring time period. The manhole covers that move during a monitoring time period form a target manhole cover sequence. In the manhole cover movement database, the sequence corresponding to the target manhole cover sequence is recorded as a reference sequence, and calculate the difference degree between the target sequence and the reference sequence; Step S400: Divide the target sequence into a part that coincides with the reference sequence and a non - coinciding part, and respectively obtain vibration characteristic functions. When the similarity between the vibration characteristic function of the coinciding part and the vibration reference function is less than the similarity between the vibration characteristic function of the non - coinciding part, send a manhole cover movement prompt to the management personnel of the manhole cover.

[0005] Further, step S100 includes: Step S101: Number all manhole covers in the target area in sequence, with each manhole cover corresponding to a unique number. The wireless monitoring sensor includes at least a vibration sensor and an angle sensor; Step S102: Obtain the construction records of the moving manhole covers in the target area. In any construction record, arrange the manhole covers in order according to the time sequence of the moving manhole covers, collect the numbers of the manhole covers in the arranged order, and gather the numbers of the corresponding manhole covers in a construction record to obtain a manhole cover movement sequence; Step S103: Gather all manhole cover movement sequences to form a manhole cover movement database; Collect the opening order of the manhole covers through historical records, and use the normal movement order of the manhole covers as a reference. When the opening order of the manhole covers is significantly different from the normal movement order within a certain period of time, it indicates that there are abnormal movement situations of the manhole covers during this period.

[0006] Further, step S200 includes: Step S201: Obtain the tool information of the moving manhole covers from the construction records of the moving manhole covers, screen the tools through relevant experts, and use the tools that meet the relevant construction specifications as target tools; Step S202: Set a wireless vibration sensor on the inner surface of any manhole cover. During the process of relevant staff using the target tool to move any manhole cover, the wireless vibration sensor transmits vibration information back, and establish a vibration change function of the vibration amplitude changing with time; Step S203: Obtain several vibration change functions corresponding to the target tool, extract the function characteristics of the several vibration change functions, and establish a vibration characteristic function of the target tool during the process of moving the manhole cover according to the function characteristics, and record the vibration characteristic function as the vibration reference function; Model the vibration situation during the manhole cover movement. During normal construction operations, professional workers use special tools, and during the process of moving the manhole cover, an operation characteristic will be generated. If non-professional personnel or personnel using non-professional tools move the manhole cover, the generated operation characteristic will be significantly different from that of professional workers; Therefore, comparing the operation characteristics is conducive to detecting random damage events to the manhole covers.

[0007] Further, step S300 includes: Step S301: Set a monitoring time period with a duration of T 0 According to the sequence of the manhole cover movement, gather the numbers of the manhole covers that move during a certain monitoring time period to obtain a target manhole cover sequence; Step S302: Obtain the set A composed of all manhole covers in the target manhole cover sequence, A: {a 1 ,a2 , a 3 , ……, a n} where a 1 , a 2 , a 3 , …… and a n respectively represent the 1st, 2nd, 3rd, …… and nth manhole covers in the target manhole cover sequence. Obtain the set B composed of all manhole covers in a certain manhole cover movement sequence. B: {b i+1 , b i+2 , b i+3 , ……, b i+n}}, where b i+1 , b i+2 , b i+3 , …… and b i+n respectively represent the 1st, 2nd, 3rd, …… and nth manhole covers starting from the (i + 1)th manhole cover in a certain manhole cover movement sequence; Step S303: Calculate the difference coefficient α, α = num(A ∩ B), where num represents the function of obtaining the number of elements in the set. Traverse all manhole cover movement sequences in the manhole cover movement database. When α takes the minimum value, output the manhole cover sequence segment and set the manhole cover sequence segment as the reference sequence; Step S304: Assemble all manhole covers in the reference sequence into set B A , calculate α * = num(B A ), q = num(A) - α * , calculate the difference degree d between the reference sequence and the target sequence, , where K j represents the manhole cover number corresponding to the jth manhole cover in the target sequence, and M j represents the manhole cover number corresponding to the jth manhole cover in the reference sequence.

[0008] Further, step S400 includes: Step S401: Calculate set G1 and set G2, where G1 = A ∩ B A , G2 = A - G1; Step S402: Assemble the manhole cover numbers corresponding to all manhole covers in G1 into the first process sequence, and assemble the manhole cover numbers corresponding to all manhole covers in G2 into the second process sequence. Transmit vibration information through the wireless vibration sensor, respectively obtain the vibration change functions of each manhole cover in the first process sequence during the monitoring time period, extract the function characteristics of the vibration change functions, and respectively establish the characteristic functions corresponding to the first process sequence and the second process sequence, where the first vibration function H1 corresponding to the first process sequence and the second vibration function H2 corresponding to the second process sequence; Step S403: Calculate the similarities between the first vibration function and the second vibration function and the vibration reference function respectively, denoted as w 1 and w 2 ; Step S404: Obtain the normalization function f, map the difference degree d to the interval [0, 1), the normalization function f is a monotonically increasing function in the interval, and calculate the second comparison coefficient β 2 = f(d), calculate the first comparison coefficient β 1 = 1 - β 2 ; Step S405: When β 1 × w 1 <β 2 × w 2 , give a reminder of the abnormal movement of the manhole cover to the manhole cover management personnel; w 1 represents the similarity between the vibration characteristics in the overlapping area and the reference characteristics. When the similarity is higher, the possibility of abnormal movement is smaller; w 2 represents the similarity between the vibration characteristics in the overlapping area and the characteristics of the discrete area. When the similarity is higher, the possibility of abnormal movement is greater; When w 1 and w 2 are close in value, compare through the difference degree between the target sequence and the reference sequence. When the difference degree between the target sequence and the reference sequence is large, the value of β 2 is larger. At this time, it is easier to reflect the difference of β 1 × w 1 <β 2 × w 2 , making the judgment of the abnormal movement of the manhole cover more accurate.

[0009] To better implement the above method, a manhole cover abnormal movement monitoring module is also proposed, which includes: a first monitoring sub-module and a second monitoring sub-module. Among them, the first monitoring sub-module is installed on the inner surface of the manhole cover, used to collect the movement of the manhole cover for status monitoring, and transmit the monitored status data back to the second monitoring sub-module. The second monitoring sub-module is installed on the user side of the manhole cover management personnel, used to receive the monitoring data of the manhole cover, compare the monitoring data of the manhole cover, and judge the abnormal movement situation of the manhole cover.

[0010] Further, the first monitoring sub-module includes: a first communication unit, a vibration sensor, an angle sensor, and a vibration feature acquisition unit. Among them, the first communication unit is used for the communication between the first monitoring sub-module and the second monitoring sub-module. Through the NB-IOT networking method, the data collected by the first monitoring sub-module is sent to the second monitoring sub-module. The angle sensor is used to judge whether the manhole cover is moved, set an angle preset value, and when the inclination angle of the manhole cover is greater than the preset value, it is judged that the manhole cover is moved. The vibration sensor is used to record the vibration condition during the movement of the manhole cover after the manhole cover moves. The vibration feature acquisition unit is used to acquire the features during the vibration of the manhole cover.

[0011] Further, the second monitoring sub-module includes: a historical record management unit, a target tool management unit, and a vibration reference feature management unit. Among them, the historical record management unit is used to collect the order of manhole cover movement in the target area and manage the manhole cover movement database. The target tool management unit is used to record the tools that meet the relevant construction specifications. The vibration reference feature management unit is used to record the vibration reference function generated during the process of the target tool moving the manhole cover.

[0012] Further, the second monitoring sub-module further includes: a second communication unit, a target manhole cover sequence acquisition unit, a sequence comparison unit, and a difference degree calculation unit. Among them, the second communication unit is used to receive the manhole cover monitoring data sent by the first communication module. The target manhole cover sequence acquisition unit is used to obtain the monitoring time period, collect the manhole cover information during the monitoring time period, and obtain the target manhole cover sequence. The sequence comparison unit is used to compare the target manhole cover sequence with the manhole cover movement database, and obtain the record segment with the largest coincidence degree by calculating the minimum value of the difference coefficient. The difference degree calculation unit is used to calculate the difference degree between the target manhole cover sequence and the reference sequence.

[0013] Further, the second monitoring sub-module further includes: a coincidence extraction unit, a vibration function management unit, a similarity calculation unit, and an alarm prompt unit. Among them, the coincidence extraction unit is used to divide the target manhole cover sequence into the coincidence part and the non-coincidence part with the reference sequence. The vibration function management unit is used to extract the features of the vibration functions corresponding to the coincidence part and the non-coincidence part respectively. The similarity calculation unit is used to calculate the similarity between the vibration feature function of the coincidence part and the vibration reference function and the similarity between the vibration feature function of the coincidence part and the vibration feature function of the non-coincidence part. The alarm prompt unit is used to judge whether there is any abnormal movement of the manhole cover in the target manhole cover sequence.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By performing data modeling on the operation sequence of the manhole cover and the motion characteristics of moving the manhole cover, the abnormal movement of the manhole cover is monitored from two dimensions: whether the movement of the manhole cover conforms to the operation sequence and whether the process of moving the manhole cover conforms to the usual operation habits, improving the pertinence of monitoring the abnormal movement of the manhole cover. And a manhole cover abnormal movement monitoring module is designed, saving the time of relevant management personnel for data management through remote monitoring and automatic alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic structural diagram of a manhole cover abnormal movement monitoring module of the present invention; Figure 2 FIG. is a schematic flow diagram of a manhole cover abnormal movement monitoring method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment: As Figure 1 and Figure 2 shown, the present invention provides a technical solution, a manhole cover abnormal movement monitoring method; Step S100: Set an area including several manhole covers as the target area. Wireless monitoring sensors are arranged on several manhole covers, and the construction records of moving the manhole covers in the target area are collected, and the sequence of moving the manhole covers in each construction record is gathered to obtain a manhole cover movement database; Among them, step S100 includes: Step S101: Number all the manhole covers in the target area in sequence, and each manhole cover corresponds to a unique number. The wireless monitoring sensor includes at least a vibration sensor and an angle sensor; Step S102: Obtain the construction records of moving the manhole covers in the target area. In any construction record, arrange the sequence of the manhole covers according to the time sequence of moving the manhole covers, collect the numbers of the manhole covers according to the arranged sequence of the manhole covers, and gather the numbers of the corresponding manhole covers in a construction record to obtain a manhole cover movement sequence; Step S103: Gather all the manhole cover movement sequences to form a manhole cover movement database.

[0018] Step S200: Obtain the tools that comply with the relevant construction specifications during the operation of moving manhole covers. Record the vibrations generated by the manhole covers during the process of relevant workers using the tools to move the manhole covers to obtain a vibration reference function; Among them, step S200 includes: Step S201: Obtain the tool information for moving the manhole cover from the construction records of moving the manhole cover. Screen the tools through relevant experts, and use the tools that comply with the relevant construction specifications as the target tools; Step S202: Set up a wireless vibration sensor on the inner surface of any manhole cover. During the process of relevant workers using the target tool to move any manhole cover, the wireless vibration sensor transmits vibration information back, and establish a vibration change function of the vibration amplitude changing with time; Step S203: Obtain several vibration change functions corresponding to the target tool, extract the function characteristics of the several vibration change functions, and establish a vibration characteristic function of the target tool during the process of moving the manhole cover according to the function characteristics. Denote the vibration characteristic function as the vibration reference function.

[0019] Step S300: Set a monitoring time period, form a target manhole cover sequence with the manhole covers that move during a monitoring time period, and denote the manhole cover sequence in the manhole cover movement database as the reference sequence, and calculate the difference degree between the target sequence and the reference sequence; Among them, step S300 includes: Step S301: Set a monitoring time period with a duration of T 0 According to the sequence of manhole cover movement, collect the manhole cover numbers of the manhole covers that move during a certain monitoring time period to obtain a target manhole cover sequence; Step S302: Obtain the set A composed of all manhole covers in the target manhole cover sequence, A: {a 1 , a 2 , a 3 , ……, a n}, where a 1 , a 2 , a 3 , …… and a n respectively represent the 1st, 2nd, 3rd, …… and the nth manhole covers in the target manhole cover sequence. Obtain the set B composed of all manhole covers in a certain manhole cover movement sequence, B: {b i+1 , b i+2 , b i+3 , ……, b i+n}, where b i+1 , b i+2 , b i+3 , …… and b i+nrespectively represent the 1st, 2nd, 3rd, …… and the nth manhole covers starting from the (i + 1)-th manhole cover in a certain manhole cover movement sequence; Step S303: Calculate the difference coefficient α, α = num(A ∩ B), where num represents the function to obtain the number of elements in the set. Traverse all manhole cover movement sequences in the manhole cover movement database. When α reaches the minimum value, output the manhole cover sequence segment and set the manhole cover sequence segment as the reference sequence; Step S304: Aggregate all manhole covers in the reference sequence into set B A , calculate α * = num(B A ), q = num(A) - α * , calculate the difference degree d between the reference sequence and the target sequence, , where K j represents the manhole cover number corresponding to the j-th manhole cover in the target sequence, and M j represents the manhole cover number corresponding to the j-th manhole cover in the reference sequence.

[0020] Step S400: Divide the target sequence into the overlapping part and the non-overlapping part with the reference sequence, and respectively obtain the vibration characteristic functions. When the similarity between the vibration characteristic function of the overlapping part and the vibration reference function is less than the similarity between the vibration characteristic function of the non-overlapping part, send a manhole cover movement abnormality prompt to the management personnel of the manhole cover; Among them, Step S400 includes: Step S401: Calculate set G1 and set G2, where G1 = A ∩ B A , G2 = A - G1; Step S402: Aggregate the manhole cover numbers corresponding to all manhole covers in G1 to form the first process sequence, and aggregate the manhole cover numbers corresponding to all manhole covers in G2 to form the second process sequence. Transmit the vibration information back through the wireless vibration sensor, respectively obtain the vibration change functions of each manhole cover in the first process sequence during the monitoring time period, extract the function characteristics of the vibration change functions, and respectively establish the characteristic functions corresponding to the first process sequence and the second process sequence. Among them, the first vibration function H1 corresponding to the first process sequence and the second vibration function H2 corresponding to the second process sequence; Step S403: Calculate the similarities between the first vibration function and the second vibration function and the vibration reference function respectively, and denote them as w 1 and w 2 ; Step S404: Obtain the normalization function f, map the difference degree d to the interval [0, 1), and the normalization function f is a monotonically increasing function in the interval. Calculate the second comparison coefficient β 2 = f(d), calculate the first comparison coefficient β 1 = 1 - β 2 ; More preferably, the normalization function is selected as f = 1 - e -kx , where e represents the natural constant and x is the independent variable; More preferably, the value range of k is: 0 < k < 1; Step S405: When β 1 × w 1 < β 2 × w 2 , a reminder of the manhole cover movement is given to the manhole cover management personnel; In the embodiment, A = a1, a2, a3, a4, B A = b1, b2, b3, b4, where a1 = b1, a2 = b2, a4 = b4, that is, a1 and b1, a2 and b2, a4 and b4 are the same; The difference between the manhole cover numbers corresponding to a3 and b3 is 4, then the difference degree between A and B A is 4; When w1 = 0.7, w2 = 0.6, k = 0.3; β 2 = 0.7, β 1 = 0.3. At this time, the condition β 1 × w 1 < β 2 × w 2 is satisfied, so there is a movement of the manhole cover in A; As a boundary condition, when the manhole cover numbers correspond one by one, that is, any K j - M j = 0, d = 0. At this time, β 2 = 0, which belongs to the situation that conforms to the manhole cover operation sequence, and no alarm information is sent.

[0021] A manhole cover movement monitoring module, the module includes: a first monitoring sub-module and a second monitoring sub-module; The first monitoring sub-module is installed on the inner surface of the manhole cover, and is used to collect the movement of the manhole cover for status monitoring, and transmit the monitored status data back to the second monitoring sub-module. Among them, the first monitoring sub-module includes: a first communication unit, a vibration sensor, an angle sensor, and a vibration feature acquisition unit; Among them, the first communication unit is used for the communication between the first monitoring sub-module and the second monitoring sub-module, and sends the data collected by the first monitoring sub-module to the second monitoring sub-module through the NB-IOT networking method; Among them, the angle sensor is used to judge whether the manhole cover is moved, and an angle preset value is set. When the inclination angle of the manhole cover is greater than the preset value, it is judged that the manhole cover is moved; Among them, the vibration sensor is used to record the vibration condition during the movement of the manhole cover after the manhole cover moves; Among them, the vibration feature acquisition unit is used to acquire the features during the vibration of the manhole cover; The second monitoring sub-module is installed at the user end of the manhole cover management personnel, and is used to receive the monitoring data of the manhole cover, compare the monitoring data of the manhole cover, and judge the abnormal conditions of the manhole cover. Among them, the second monitoring sub-module includes: a historical record management unit, a target tool management unit, a vibration reference feature management unit, a second communication unit, a target manhole cover sequence acquisition unit, a sequence comparison unit, a difference degree calculation unit, a coincidence extraction unit, a vibration function management unit, a similarity calculation unit, and an alarm prompt unit; Among them, the historical record management unit is used to collect the order of manhole cover movement in the target area and manage the manhole cover movement database; Among them, the target tool management unit is used to record the tools that meet the relevant construction specifications; Among them, the vibration reference feature management unit is used to record the vibration reference function generated during the process of the target tool moving the manhole cover; Among them, the second communication unit is used to receive the manhole cover monitoring data sent by the first communication module; Among them, the target manhole cover sequence acquisition unit is used to obtain the monitoring time period, collect the manhole cover information in the monitoring time period, and obtain the target manhole cover sequence; Among them, the sequence comparison unit is used to compare the target manhole cover sequence with the manhole cover movement database, and obtain the record segment with the largest coincidence degree by calculating the minimum value of the difference coefficient; Among them, the difference degree calculation unit is used to calculate the difference degree between the target manhole cover sequence and the reference sequence; Among them, the coincidence extraction unit is used to divide the target manhole cover sequence into the coincidence part and the non-coincidence part with the reference sequence; Among them, the vibration function management unit is used to extract the features of the vibration functions corresponding to the coincidence part and the non-coincidence part respectively; Among them, the similarity calculation unit is used to calculate the similarity between the vibration feature function of the coincidence part and the vibration reference function and the similarity between the vibration feature function of the coincidence part and the vibration feature function of the non-coincidence part; Among them, the alarm prompt unit is used to judge whether there is any abnormality in the manhole covers in the target manhole cover sequence.

[0022] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A method for monitoring abnormal movement of a manhole cover, characterized in that: The method comprises the following steps: Step S100: setting an area including a plurality of manhole covers as a target area, wherein the plurality of manhole covers are provided with wireless monitoring sensors, collecting construction records of moving manhole covers in the target area, and collecting the sequence of moving manhole covers in each construction record to obtain a manhole cover movement database; Step S200: obtaining tools that meet relevant construction specifications in the manhole cover moving operation, recording the vibration generated by the manhole cover when the relevant staff uses the tools to move the manhole cover, and obtaining a vibration reference function; Step S300: setting a monitoring time period, forming a target manhole cover sequence with the manhole covers that move during the monitoring time period, recording the manhole cover movement database and the target manhole cover sequence as a reference sequence, and calculating the difference between the target sequence and the reference sequence; Step S400: Divide the target sequence into a part that overlaps with the reference sequence and a part that does not overlap, and obtain vibration characteristic functions respectively. When the similarity between the vibration characteristic function of the overlapping part and the vibration reference function is less than the similarity between the vibration characteristic function of the overlapping part and the non-overlapping part, a manhole cover movement prompt is issued to the manhole cover manager.

2. A method for monitoring abnormal movement of a manhole cover according to claim 1, characterized in that: Step S100 includes: Step S101: numbering all manhole covers in the target area in sequence, each manhole cover corresponds to a unique number, and the wireless monitoring sensor includes at least a vibration sensor and an angle sensor; Step S102: Obtain construction records of moving manhole covers in the target area. In any construction record, arrange the order of the manhole covers according to the time sequence of moving the manhole covers, collect the numbers of the manhole covers according to the arrangement sequence of the manhole covers, and collect the numbers of the manhole covers corresponding to a construction record to obtain a manhole cover movement sequence; Step S103: Collect all manhole cover movement sequences to form a manhole cover movement database.

3. A method for monitoring abnormal movement of a manhole cover according to claim 2, characterized in that: Step S200 includes: Step S201: obtaining tool information of the mobile manhole cover from the construction record of the mobile manhole cover, screening the tools through relevant experts, and selecting tools that meet relevant construction specifications as target tools; Step S202: a wireless vibration sensor is arranged on the inner surface of any manhole cover, and when the relevant staff uses the target tool to move the manhole cover, the wireless vibration sensor transmits vibration information back to establish a vibration change function of the vibration amplitude changing with time; Step S203: Obtain several vibration change functions corresponding to the target tool, extract function features of the several vibration change functions, establish a vibration characteristic function of the target tool in the process of moving the manhole cover according to the function features, and record the vibration characteristic function as a vibration reference function.

4. A method for monitoring abnormal movement of a manhole cover according to claim 3, characterized in that: Step S300 includes: Step S301: Setting a monitoring time period of duration T0, collecting the manhole cover numbers of the manhole covers moved in a certain monitoring time period according to the order in which the manhole covers are moved, and obtaining a target manhole cover sequence; Step S302: Obtain a set A consisting of all manhole covers in the target manhole cover sequence, where A: {a1, a2, a3, ..., a n }, where a1, a2, a3, ... and a n represent the first, second, third, ... and nth manhole covers in the target manhole cover sequence respectively, and obtain the set B of all manhole covers in a manhole cover movement sequence. B: {b i+1 , b i+2 , b i+3 , ..., b i+n }, where b i+1 , b i+2 , b i+3 , ... and b i+n They respectively represent the first, second, third, ... and nth manhole covers starting from the i+1th manhole cover in the manhole cover movement sequence; Step S303: Calculate the difference coefficient α, α=num(A∩B), where num represents a function for obtaining the number of elements in a set, traverse all manhole cover movement sequences in the manhole cover movement database, and when α reaches a minimum value, output a manhole cover sequence segment, and set the manhole cover sequence segment as a reference sequence; Step S304: Gather all manhole covers in the reference sequence into set B A , calculate α * =num(B A ), q=num(A)-α * , calculate the difference d between the reference sequence and the target sequence, , where K j represents the manhole cover number corresponding to the jth manhole cover in the target sequence, M j Represents the manhole cover number corresponding to the j-th manhole cover in the reference sequence.

5. A method for monitoring abnormal movement of a manhole cover according to claim 4, characterized in that: Step S400 includes: Step S401: Calculate the set G1 and the set G2, where G1=A∩B A , G2=A-G1; Step S402: The manhole cover numbers corresponding to all the manhole covers in G1 are collected to form a first process sequence, and the manhole cover numbers corresponding to all the manhole covers in G2 are collected to form a second process sequence. Vibration information is transmitted back by a wireless vibration sensor, and the vibration change function of each manhole cover in the first process sequence during the monitoring time period is obtained respectively, and the function characteristics of the vibration change function are extracted. The characteristic functions corresponding to the first process sequence and the second process sequence are respectively established, wherein the first process sequence corresponds to a first vibration function H1, and the second process sequence corresponds to a second vibration function H2; Step S403: respectively calculating the similarities between the first vibration function and the second vibration function and the vibration reference function, which are denoted as w1 and w2 respectively; Step S404: obtaining a normalization function f, mapping the difference d to the interval [0,1), wherein the normalization function f is a monotonically increasing function in the interval, calculating the second comparison coefficient β2=f(d), and calculating the first comparison coefficient β1=1-β2; Step S405: When β1×w1<β2×w2, the manhole cover management personnel are reminded of the manhole cover movement.

6. A manhole cover abnormal movement monitoring module, used to execute a manhole cover abnormal movement monitoring method according to any one of claims 1 to 5, characterized in that: The system includes: The first monitoring submodule and the second monitoring submodule, wherein the first monitoring submodule is installed on the inner surface of the manhole cover, and is used to collect the movement of the manhole cover for status monitoring, and transmit the monitored status data back to the second monitoring submodule; the second monitoring submodule is installed on the user end of the manhole cover manager, and is used to receive the monitoring data of the manhole cover, compare the monitoring data of the manhole cover, and judge the abnormal movement of the manhole cover.

7. A manhole cover movement monitoring module according to claim 6, characterized in that: The first monitoring submodule includes: a first communication unit, a vibration sensor, an angle sensor and a vibration feature collection unit, wherein the first communication unit is used for communication between the first monitoring submodule and the second monitoring submodule, and sends the data collected by the first monitoring submodule to the second monitoring submodule through NB-IOT networking. The angle sensor is used to determine whether the manhole cover has been moved and set a preset angle value. When the angle of inclination of the manhole cover is greater than the preset value, it is determined that the manhole cover has been moved. The vibration sensor is used to record the vibration of the manhole cover during its movement after the manhole cover moves. The vibration feature collection unit is used to collect the characteristics of the manhole cover during vibration.

8. A manhole cover movement monitoring module according to claim 6, characterized in that: The second monitoring submodule includes: a historical record management unit, a target tool management unit and a vibration reference feature management unit, wherein the historical record management unit is used to collect the order of manhole cover movement in the target area and manage the manhole cover movement database, the target tool management unit is used to record tools that meet relevant construction specifications, and the vibration reference feature management unit is used to record the vibration reference function generated during the process of moving the manhole cover with the target tool.

9. A manhole cover movement monitoring module according to claim 8, characterized in that: The second monitoring submodule also includes: a second communication unit, a target manhole cover sequence acquisition unit, a sequence comparison unit and a difference calculation unit, wherein the second communication unit is used to receive the manhole cover monitoring data sent by the first communication module, the target manhole cover sequence acquisition unit is used to obtain the monitoring time period, collect the manhole cover information in the monitoring time period, and obtain the target manhole cover sequence, the sequence comparison unit is used to compare the target manhole cover sequence with the manhole cover mobile database, and obtain the record segment with the largest degree of overlap by calculating the minimum value of the difference coefficient, and the difference calculation unit is used to calculate the difference between the target manhole cover sequence and the reference sequence.

10. A manhole cover movement monitoring module according to claim 9, characterized in that: The second monitoring submodule also includes: an overlap extraction unit, a vibration function management unit, a similarity calculation unit and an alarm prompt unit, wherein the overlap extraction unit is used to divide the target manhole cover sequence into an overlap part and a non-overlap part with the reference sequence, the vibration function management unit is used to extract the characteristics of the vibration function corresponding to the overlap part and the non-overlap part respectively, the similarity calculation unit is used to calculate the similarity between the vibration characteristic function of the overlap part and the vibration reference function and the similarity between the vibration characteristic function of the overlap part and the vibration characteristic function of the non-overlapping part, and the alarm prompt unit is used to determine whether there is any abnormal movement of the manhole cover in the target manhole cover sequence.

Images