A cable health status identification method and device

Abstract

The present invention provides a cable health status identification method and device, belonging to the technical field of bridge structure health monitoring, the method includes: obtaining cable temperature data and ambient temperature data of the cable; determining whether the cable body is damaged based on the cable temperature data; determining the temperature response coefficient and response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and determining whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient; the temperature response coefficient is used to characterize the temperature change amplitude, and the response hysteresis coefficient is used to characterize the speed at which the temperature reaches a peak or a trough. In the identification process, the present invention only needs to use the cable temperature data to realize the identification of the two health states of cable clamp looseness and cable body damage, the amount of data is small, and accurate and rapid identification of the cable health status is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge structure health monitoring, and in particular to a cable health status identification method and device. Background Art

[0002] After the bridge cable is completed, its structural health monitoring is very important. Structural health monitoring technology is to apply smart materials to the structure, and use the special sensor devices in the smart materials to obtain important information about the safety and health of the structure in real time online, such as vibration frequency, strain, stress, temperature, etc. After obtaining the relevant information about the structure, the information is processed, the actual parameters of the structure are analyzed, and a structural model is established. Based on the analysis and calculation, the safe use and health status of the structure is identified.

[0003] Research in the field of cable structure health monitoring has achieved some results, but there are still some problems: there is a lot of data related to the health of cable structures, and the existing technology needs to analyze massive data to determine the health status of the cable structure. The analysis efficiency is low, and sometimes it is impossible to output valid health status information.

[0004] Therefore, there is an urgent need to provide a cable health status identification method and device to achieve rapid and accurate identification of the cable health status. Summary of the invention

[0005] In view of this, it is necessary to provide a cable health status identification method and device to solve the technical problems existing in the prior art that massive data needs to be analyzed, resulting in low efficiency in identifying the cable health status and inability to effectively identify the cable health status.

[0006] On the one hand, in order to solve the above technical problems, the present invention provides a method for identifying the health status of a cable, wherein the cable includes a cable clamp and a cable body, and the method includes:

[0007] Acquiring cable temperature data and ambient temperature data of the cable;

[0008] determining whether the cable body is damaged based on the cable temperature data;

[0009] Determine the temperature response coefficient and response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and determine whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient;

[0010] The temperature response coefficient is used to characterize the amplitude of temperature change, and the response hysteresis coefficient is used to characterize how fast the temperature reaches a peak or a trough.

[0011] In a possible implementation, the temperature response coefficient is:

[0012]

[0013] The response hysteresis coefficient is:

[0014]

[0015] In the formula, is the temperature response coefficient; is the peak temperature of the cable body within 24 hours; is the valley temperature of the cable body within 24 hours; It is the peak temperature of the environment within 24 hours; It is the valley temperature of the environment within 24 hours; is the response hysteresis coefficient; The peak moment of cable body temperature within 24 hours; It is the peak moment of ambient temperature within 24 hours.

[0016] In a possible implementation, determining whether the cable body is damaged based on the cable temperature data includes:

[0017] Generating a radial isotherm diagram of each axial sampling point of the cable based on the cable temperature data;

[0018] Determining whether an isotherm in the radial isotherm diagram is concave;

[0019] When the isothermal lines in the radial isothermal map are concave, it is determined that the cable body is damaged, and when the isothermal lines in the radial isothermal map are not concave, it is determined that the cable body is not damaged.

[0020] In a possible implementation, the damage types of the cable body include cable body corrosion and wrapping layer damage; then the method further includes:

[0021] Determine the depression range where the depression occurs in the radial isotherm diagram;

[0022] When the concave range is larger than a preset range, the damage type of the cable body is damage to the wrapping layer; when the concave range is smaller than or equal to the preset range, the damage type of the cable body is corrosion of the cable body.

[0023] In a possible implementation, determining whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient includes:

[0024] Determining whether the temperature response coefficient is less than a first response coefficient threshold and whether the response hysteresis coefficient is greater than a first hysteresis coefficient threshold;

[0025] When the temperature response coefficient is less than a first response coefficient threshold, and the response hysteresis coefficient is greater than a first hysteresis coefficient threshold, it is determined that the cable clamp is loose, and a loosening warning signal is generated.

[0026] In a possible implementation, the method further includes:

[0027] Determining whether the temperature response coefficient is less than a second response coefficient threshold;

[0028] When the temperature response coefficient is less than a second response coefficient threshold, a loosening alarm signal is generated;

[0029] The second response coefficient threshold is smaller than the first response coefficient threshold.

[0030] In a possible implementation, the method further includes:

[0031] When it is determined that the cable clamp is loose, determining the distance offset between the peak temperature of the cable body within 24 hours and the peak temperature of the environment within 24 hours;

[0032] When the distance offset is greater than a first threshold distance, generating a slip warning signal;

[0033] When the distance offset is greater than a second threshold distance, generating a slip alarm signal;

[0034] The first threshold distance is smaller than the second threshold distance.

[0035] In a possible implementation manner, when the damage type of the cable body is cable body corrosion, the method further includes:

[0036] Determine the minimum temperature response coefficient and the maximum response hysteresis coefficient at the concave;

[0037] Determining whether the minimum temperature response coefficient is less than a second response coefficient threshold, and whether the maximum response hysteresis coefficient is greater than a second hysteresis coefficient threshold;

[0038] When the minimum temperature response coefficient is less than the second response coefficient threshold, and the maximum response hysteresis coefficient is greater than the second hysteresis coefficient threshold, a corrosion warning signal is generated;

[0039] Determining whether the minimum temperature response coefficient is less than a third response coefficient threshold, and whether the maximum response hysteresis coefficient is greater than a third hysteresis coefficient threshold;

[0040] When the minimum temperature response coefficient is less than a third response coefficient threshold, and the maximum response hysteresis coefficient is greater than the third hysteresis coefficient threshold, a corrosion alarm signal is generated;

[0041] The second response coefficient threshold is greater than the third response coefficient threshold, and the second hysteresis coefficient threshold is less than the third hysteresis coefficient threshold.

[0042] In a possible implementation, when the damage type of the cable body is damage to the wrapping layer, the method further includes:

[0043] Determine the peak value of the temperature response coefficient and the valley value of the response hysteresis coefficient;

[0044] Determine whether the temperature response coefficient peak value is greater than a fourth response coefficient threshold value, and whether the response hysteresis coefficient valley value is less than a fourth hysteresis coefficient threshold value;

[0045] When the temperature response coefficient peak value is greater than the fourth response coefficient threshold value, and the response hysteresis coefficient valley value is less than the fourth hysteresis coefficient threshold value, a wrapping layer damage warning signal is generated;

[0046] Determine whether the temperature response coefficient peak value is greater than a fifth response coefficient threshold value, and whether the response hysteresis coefficient valley value is less than a fifth hysteresis coefficient threshold value;

[0047] When the temperature response coefficient peak value is greater than the fifth response coefficient threshold value, and the response hysteresis coefficient valley value is less than the fifth hysteresis coefficient threshold value, a wrapping layer damage alarm signal is generated;

[0048] The fourth response coefficient threshold is smaller than the fifth response coefficient threshold, and the fourth hysteresis coefficient threshold is larger than the fifth hysteresis coefficient threshold.

[0049] On the other hand, the present invention also provides a cable health status identification device, the cable includes a cable clamp and a cable body, and the device includes:

[0050] A temperature data acquisition unit, used to acquire cable temperature data and ambient temperature data of the cable;

[0051] a cable body damage determination unit, configured to determine whether the cable body is damaged based on the cable temperature data;

[0052] a cable clamp loosening determination unit, configured to determine a temperature response coefficient and a response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and to determine whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient;

[0053] The temperature response coefficient is used to characterize the amplitude of temperature change, and the response hysteresis coefficient is used to characterize how fast the temperature reaches a peak or a trough.

[0054] The beneficial effects of the present invention are as follows: the cable health status identification provided by the present invention utilizes the characteristics that the heat transfer efficiency is stable when the cable body and the cable clamp are not abnormal, that is, when the cable body and the cable clamp are not abnormal, the cable temperature distribution and temperature change law are stable. By comparing the obtained cable temperature data with the data when no abnormality occurs, it can be determined whether the cable body is damaged. If the cable clamp and the cable body are loose, the air layer formed between the cable clamp and the cable body will cause the heat transfer efficiency to change, which is specifically manifested as: the temperature change amplitude becomes smaller in the same time period, and it takes more time to reach the peak or trough. Therefore, the temperature influence coefficient and the response hysteresis coefficient are used to determine whether the cable clamp is loose from two dimensions: the temperature change amplitude and the speed of reaching the peak or trough, so as to realize accurate identification of the loose cable clamp. In summary, the present invention only needs to use the cable temperature data in the identification process to realize the identification of the two health states of cable clamp looseness and cable body damage, and the amount of data is small, so as to realize accurate and rapid identification of the cable health status. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 A schematic flow chart of an embodiment of a method for identifying the health status of a cable provided by the present invention;

[0057] Figure 2 A temperature curve diagram of the cable body, cable clamp and anchor chamber provided by the present invention over time;

[0058] Figure 3 For the present invention Figure 1 A schematic flow chart of an embodiment of step S102;

[0059] Figure 4 A radial isotherm diagram at a certain axial position provided by the present invention;

[0060] Figure 5 A schematic diagram of a flow chart of an embodiment of determining cable body corrosion and wrapping layer damage provided by the present invention;

[0061] Figure 6 For the present invention Figure 1 A schematic diagram of an embodiment of step S103;

[0062] Figure 7 A schematic diagram of a flow chart of an embodiment of determining the degree of cable corrosion provided by the present invention;

[0063] Figure 8 A schematic diagram of a flow chart of an embodiment of determining the degree of damage of a wrapping layer provided by the present invention;

[0064] Fig. 9 A temperature response coefficient diagram varying with distance provided by the present invention;

[0065] Fig.10 A graph of response hysteresis coefficients varying with distance provided by the present invention;

[0066] Fig.11 A schematic structural diagram of an embodiment of a cable health status identification device provided by the present invention. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0068] It should be understood that the schematic drawings are not drawn to scale. The flowchart used in the present invention shows the operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowchart can be implemented out of order, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present invention, and can also remove one or more operations from the flowchart. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0069] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment 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.

[0070] The present invention provides a method and device for identifying the health status of a cable, which are described below respectively.

[0071] Before showing the specific implementation, the cable is introduced first. The cable refers to the structure in the suspension bridge. Specifically, the suspension bridge refers to a bridge with cables suspended through cable towers and anchored on both banks or both ends of the bridge as the main load-bearing components of the upper structure. The cable includes a cable body and a cable clamp. The cable body is connected to the suspension cable through the cable clamp. There are several parallel steel cables inside the cable body, which is a metal structure. The cable clamp is also a metal structure. The cable body is wrapped with a wrapping layer, which is a non-metallic material.

[0072] Figure 1 A schematic diagram of an embodiment of the cable health status identification method provided by the present invention is shown in FIG. Figure 1 As shown, the cable health status identification method includes:

[0073] S101, obtaining cable temperature data and ambient temperature data of the cable;

[0074] S102, determining whether the cable body is damaged based on the cable temperature data;

[0075] S103, determining a temperature response coefficient and a response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and determining whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient;

[0076] Among them, the temperature response coefficient is used to characterize the amplitude of temperature change, and the response hysteresis coefficient is used to characterize how fast the temperature reaches the peak or trough.

[0077] It should be noted that the temperature of the anchor chamber in the suspension bridge can be used as the ambient temperature data in step S101.

[0078] In order to verify the effectiveness of identifying the health status of the cable by using the temperature response coefficient and the response hysteresis coefficient, in a specific embodiment of the present invention, Figure 2 As shown, Figure 2 The 10m, 113m and 200m in the figure represent the lengths of the anchor chamber, the cable clamp and the cable body, respectively. Figure 2 It can be seen that due to the different heat capacities of the cable clamp and the cable body, the heat conduction process has different heat transfer rates. The time taken for the anchor chamber position (ambient temperature), cable clamp, and cable body to reach the peak temperature gradually becomes longer, which is reflected in the image as an obvious peak delay. In addition, during the heating process, the temperature of the cable clamp position is higher than that of the cable body, which is reflected in the peak value on the temperature axial distribution diagram; during the cooling process, the temperature of the cable clamp is lower than that of the cable body, which is reflected in the valley value on the temperature axial distribution diagram. That is, when the heat transfer efficiency decreases, the temperature response coefficient decreases accordingly, and the response hysteresis coefficient increases accordingly. Therefore, the health status of the cable can be identified by the temperature response coefficient and the response hysteresis coefficient.

[0079] Compared with the prior art, the cable health status identification provided by the embodiment of the present invention utilizes the characteristics that the heat transfer efficiency is stable when the cable body and the cable clamp are not abnormal, that is, when the cable body and the cable clamp are not abnormal, the cable temperature distribution and temperature change law are stable. By comparing the obtained cable temperature data with the data when no abnormality occurs, it can be determined whether the cable body is damaged. If the cable clamp and the cable body are loose, the air layer formed between the cable clamp and the cable body will cause the heat transfer efficiency to change, which is specifically manifested as: the temperature change amplitude becomes smaller in the same time period, and it takes more time to reach the peak or trough. Therefore, the temperature influence coefficient and the response hysteresis coefficient are used to determine whether the cable clamp is loose from two dimensions: the temperature change amplitude and the speed of reaching the peak or trough, so as to accurately identify the looseness of the cable clamp. In summary, the embodiment of the present invention only needs to use the cable temperature data in the identification process to realize the identification of the two health states of cable clamp looseness and cable body damage, and the amount of data is small, so as to realize accurate and rapid identification of the cable health status.

[0080] In a specific embodiment of the present invention, the temperature response coefficient is:

[0081]

[0082] The response hysteresis coefficient is:

[0083]

[0084] In the formula, is the temperature response coefficient; is the peak temperature of the cable body within 24 hours; is the valley temperature of the cable body within 24 hours; It is the peak temperature of the environment within 24 hours; It is the valley temperature of the environment within 24 hours; is the response hysteresis coefficient; The peak moment of cable body temperature within 24 hours; It is the peak moment of ambient temperature within 24 hours.

[0085] In some embodiments of the present invention, Figure 3 As shown, step S102 includes:

[0086] S301, generating a radial isotherm diagram of each axial sampling point of the cable based on the cable temperature data;

[0087] S302, determining whether the isotherms in the radial isotherm diagram are concave;

[0088] S303. When the isotherms in the radial isotherm diagram are concave, it is determined that the cable body is damaged. When the isotherms in the radial isotherm diagram are not concave, it is determined that the cable body is not damaged.

[0089] The logic of judging the cable body damage based on isotherms is that when the cable body is not damaged, a relatively stable temperature field distribution will be formed, that is, the isotherms of the isotherm diagram are evenly distributed, and when the cable body is damaged, the isotherms will be concave. Therefore, whether the cable body is damaged can be judged by whether the isotherms are concave.

[0090] The embodiment of the present invention can determine whether the cable body is damaged through the isothermal diagram, the determination process is simple, and the efficiency of cable body damage determination is further improved.

[0091] At the same time, the specific location of the cable body damage can be determined based on the location of the depression and the axial sampling point.

[0092] Furthermore, the types of damage to the cable body include cable body corrosion and wrapping layer damage, such as Figure 4 As shown in a, when the cable body is corroded, the isotherms at the corroded position will be concave, while the shape of the peripheral isotherms remains basically unchanged, as shown in Figure 4 As shown in b, when the wrapping layer is damaged, both the isothermal line at the damaged position and the peripheral isothermal line will be concave.

[0093] Therefore, in some embodiments of the present invention, Figure 5 As shown, cable health status identification also includes:

[0094] S501, determining a depression range where a depression occurs in the radial isotherm graph;

[0095] S502: When the concave range is greater than a preset range, the damage type of the cable body is damage to the wrapping layer; when the concave range is less than or equal to the preset range, the damage type of the cable body is corrosion of the cable body.

[0096] The embodiment of the present invention can determine the specific type of cable body damage by comparing the concave range with the preset range, thereby improving the efficiency of determining the cable body damage.

[0097] It should be understood that the preset range should be a certain range from the center of the cable body to the outside, and the specific range value can be set according to the actual application scenario such as the cable body diameter, and is not specifically limited here.

[0098] In some embodiments of the present invention, Figure 6 As shown, step S103 includes:

[0099] S601, determining whether the temperature response coefficient is less than a first response coefficient threshold and whether the response hysteresis coefficient is greater than a first hysteresis coefficient threshold;

[0100] S602: When the temperature response coefficient is less than the first response coefficient threshold and the response hysteresis coefficient is greater than the first hysteresis coefficient threshold, it is determined that the cable clamp is loose, and a loosening warning signal is generated.

[0101] Since the heat transfer efficiency will decrease when the cable clamp is loose, the temperature response coefficient will decrease and the response hysteresis coefficient will increase. Therefore, when the temperature response coefficient is less than the first response coefficient threshold and the response hysteresis coefficient is greater than the first hysteresis coefficient threshold, it can be determined that the cable clamp is loose.

[0102] Specifically, when the cable clamp is not loose, the theoretical response coefficient threshold is 0.25, and the response hysteresis coefficient is 1. When the temperature change amplitude drops below 80% of the normal situation and the peak time is delayed by more than 1.5 hours compared with the normal situation, it can be considered that the cable clamp is loose, that is, the first response coefficient threshold is 0.2, and the first hysteresis coefficient threshold is 1.125.

[0103] When the cable clamp is loosened to a certain extent, it will cause safety risks. In order to let bridge maintenance personnel know the degree of looseness, in some embodiments of the present invention, the cable health status identification also includes:

[0104] Determining whether the temperature response coefficient is less than a second response coefficient threshold;

[0105] When the temperature response coefficient is less than the second response coefficient threshold, a looseness alarm signal is generated;

[0106] The second response coefficient threshold is smaller than the first response coefficient threshold.

[0107] In a specific embodiment of the present invention, the second response coefficient threshold is 0.15.

[0108] The embodiment of the present invention can provide different signals for bridge maintenance personnel by generating loosening warning signals and loosening alarm signals based on different degrees of looseness. When a loosening warning signal appears, the bridge maintenance personnel can perform non-stop maintenance on the loose position. When a loosening alarm signal appears, the bridge maintenance personnel can stop and repair the loose position.

[0109] Looseness includes movement in a direction perpendicular to the sling and slippage in the direction of the cable body. To distinguish between looseness in these two different directions, in some embodiments of the present invention, cable health status identification further includes:

[0110] When it is determined that the cable clamp is loose, it is determined as the distance offset between the peak temperature of the cable body within 24 hours and the peak temperature of the environment within 24 hours;

[0111] When the distance offset is greater than a first threshold distance, a slip warning signal is generated; when the distance offset is greater than a second threshold distance, a slip alarm signal is generated;

[0112] The first threshold distance is smaller than the second threshold distance.

[0113] The embodiment of the present invention can further improve the accuracy of cable health status identification by judging whether the looseness is slippage when it occurs.

[0114] Specifically, the first threshold distance is 1 m, and the second threshold distance is 1.5 m.

[0115] Similarly, in order to determine the degree of corrosion of the cable body, in some embodiments of the present invention, Figure 7 As shown, cable health status identification also includes:

[0116] S701, determining the minimum temperature response coefficient and the maximum response hysteresis coefficient of the concave portion;

[0117] S702, determining whether the minimum temperature response coefficient is less than a second response coefficient threshold, and whether the maximum response hysteresis coefficient is greater than a second hysteresis coefficient threshold;

[0118] S703, when the minimum temperature response coefficient is less than the second response coefficient threshold, and the maximum response hysteresis coefficient is greater than the second hysteresis coefficient threshold, generating a corrosion warning signal;

[0119] S704, determining whether the minimum temperature response coefficient is less than a third response coefficient threshold, and whether the maximum response hysteresis coefficient is greater than a third hysteresis coefficient threshold;

[0120] S705, when the minimum temperature response coefficient is less than the third response coefficient threshold, and the maximum response hysteresis coefficient is greater than the third hysteresis coefficient threshold, generating a corrosion alarm signal;

[0121] The second response coefficient threshold is greater than the third response coefficient threshold, and the second hysteresis coefficient threshold is less than the third hysteresis coefficient threshold.

[0122] It should be noted that when the cable body rusts, the minimum temperature response coefficient decreases and the maximum response hysteresis coefficient increases. Therefore, the degree of rust can be determined based on the minimum temperature response coefficient and the maximum response hysteresis coefficient.

[0123] In a specific embodiment of the present invention, the second response coefficient threshold is 0.2, the third response coefficient threshold is 1.125, the second hysteresis coefficient threshold is 0.15, and the third hysteresis coefficient threshold is 1.2.

[0124] Similarly, in order to determine the degree of damage to the wrapping layer, in some embodiments of the present invention, Figure 8 As shown, cable health status identification also includes:

[0125] S801, determining a temperature response coefficient peak value and a response hysteresis coefficient valley value;

[0126] S802, determining whether the temperature response coefficient peak value is greater than a fourth response coefficient threshold, and whether the response hysteresis coefficient valley value is less than a fourth hysteresis coefficient threshold;

[0127] S803, when the temperature response coefficient peak value is greater than the fourth response coefficient threshold value, and the response hysteresis coefficient valley value is less than the fourth hysteresis coefficient threshold value, generating a wrapping layer damage warning signal;

[0128] S804, determining whether the temperature response coefficient peak value is greater than the fifth response coefficient threshold, and whether the response hysteresis coefficient valley value is less than the fifth hysteresis coefficient threshold;

[0129] S805, when the temperature response coefficient peak value is greater than the fifth response coefficient threshold value, and the response hysteresis coefficient valley value is less than the fifth hysteresis coefficient threshold value, generating a wrapping layer damage alarm signal;

[0130] The fourth response coefficient threshold is smaller than the fifth response coefficient threshold, and the fourth hysteresis coefficient threshold is larger than the fifth hysteresis coefficient threshold.

[0131] The principle for determining the degree of damage to the wrapping layer is that when the wrapping layer is damaged, the heat transfer efficiency at the damaged position will change greatly. The peak value of the temperature response coefficient will increase significantly, and the valley value of the response hysteresis coefficient will decrease significantly. Therefore, the degree of damage to the wrapping layer can be determined by the peak value of the temperature response coefficient and the valley value of the response hysteresis coefficient.

[0132] In a specific embodiment of the present invention, the fourth response coefficient threshold is 0.15, the fifth response coefficient threshold is 0.2, the fourth hysteresis coefficient threshold is 1.2, and the fifth hysteresis coefficient threshold is 1.1.

[0133] It should be noted that the early warning signal and the alarm signal in the embodiment of the present invention may be issued in the form of different sound and light signals, so that bridge maintenance personnel can quickly learn the degree of abnormality.

[0134] In a specific embodiment of the present invention, Fig. 9 and Fig.10 As shown, Fig. 9 a and Fig.10 a is the temperature response coefficient and response hysteresis coefficient when the cable clamp is loose. It can be seen that the temperature response coefficient decreases and the response hysteresis coefficient increases. Fig. 9 b and Fig.10 b is the temperature response coefficient and response hysteresis coefficient when the cable clamp slips. For the same axial position, the temperature response coefficient decreases, the response hysteresis coefficient increases, and the overall image shifts to the right, that is, a position shift occurs in the circumferential direction. Fig. 9 c and Fig.10c is the temperature response coefficient and response hysteresis coefficient when the cable body is corroded. It can be seen that the temperature response coefficient curve and the response hysteresis coefficient curve are basically unchanged. Only at the location where the cable body is corroded, the temperature response coefficient decreases and the response hysteresis coefficient increases. Fig. 9 d and Fig.10 d is the temperature response coefficient and response hysteresis coefficient when the wrapping layer is damaged. It can be seen that the temperature response coefficient and response hysteresis coefficient change suddenly at the location where the wrapping layer is damaged.

[0135] In summary, the four abnormal conditions of loose cable clamp, slippage of cable clamp, rust of cable body and damage of wrapping layer are closely related to the temperature response coefficient and response hysteresis coefficient. Therefore, the temperature response coefficient and response hysteresis coefficient can be used to determine the above abnormal conditions and the degree of abnormality, thereby improving the accuracy of cable health status identification.

[0136] In order to better implement the cable health status identification method in the embodiment of the present invention, based on the cable health status identification method, the embodiment of the present invention also provides a cable health status identification device, such as Fig.11 As shown, the cable health status identification device 1100 includes:

[0137] The temperature data acquisition unit 1101 is used to acquire the cable temperature data and the ambient temperature data of the cable;

[0138] A cable body damage determination unit 1102, configured to determine whether the cable body is damaged based on the cable temperature data;

[0139] A cable clamp loosening determination unit 1103, used to determine a temperature response coefficient and a response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and determine whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient;

[0140] Among them, the temperature response coefficient is used to characterize the amplitude of temperature change, and the response hysteresis coefficient is used to characterize how fast the temperature reaches the peak or trough.

[0141] The cable health status identification device 1100 provided in the above embodiment can implement the technical solution described in the above cable health status identification method embodiment. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above cable health status identification method embodiment, which will not be repeated here.

[0142] Correspondingly, an embodiment of the present invention also provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, it can implement the steps or functions of the cable health status identification method provided by the above-mentioned method embodiments.

[0143] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0144] The above is a detailed introduction to a cable health status identification method and device provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for identifying the health status of a cable, characterized in that: The cable comprises a cable clip and a cable body, and the method comprises: Acquiring cable temperature data and ambient temperature data of the cable; determining whether the cable body is damaged based on the cable temperature data; Determine the temperature response coefficient and response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and determine whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient; The temperature response coefficient is used to characterize the amplitude of temperature change, and the response hysteresis coefficient is used to characterize how fast the temperature reaches a peak or a trough; Determining whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient includes: Determining whether the temperature response coefficient is less than a first response coefficient threshold and whether the response hysteresis coefficient is greater than a first hysteresis coefficient threshold; When the temperature response coefficient is less than a first response coefficient threshold, and the response hysteresis coefficient is greater than a first hysteresis coefficient threshold, it is determined that the cable clamp is loose, and a loosening warning signal is generated.

2. The cable health status identification method according to claim 1, characterized in that: The temperature response coefficient is: The response hysteresis coefficient is: In the formula, is the temperature response coefficient; is the peak temperature of the cable body within 24 hours; is the valley temperature of the cable body within 24 hours; It is the peak temperature of the environment within 24 hours; It is the valley temperature of the environment within 24 hours; is the response hysteresis coefficient; The peak moment of cable body temperature within 24 hours; It is the peak moment of ambient temperature within 24 hours.

3. The cable health status identification method according to claim 1, characterized in that: The determining whether the cable body is damaged based on the cable temperature data comprises: Generating a radial isotherm diagram of each axial sampling point of the cable based on the cable temperature data; Determining whether an isotherm in the radial isotherm diagram is concave; When the isothermal lines in the radial isothermal map are concave, it is determined that the cable body is damaged, and when the isothermal lines in the radial isothermal map are not concave, it is determined that the cable body is not damaged.

4. The cable health status identification method according to claim 3, characterized in that: The damage types of the cable body include cable body corrosion and wrapping layer damage; the method further includes: Determine the depression range where the depression occurs in the radial isotherm diagram; When the concave range is larger than a preset range, the damage type of the cable body is damage to the wrapping layer; when the concave range is smaller than or equal to the preset range, the damage type of the cable body is corrosion of the cable body.

5. The cable health status identification method according to claim 1, characterized in that: The method further comprises: Determining whether the temperature response coefficient is less than a second response coefficient threshold; When the temperature response coefficient is less than a second response coefficient threshold, a loosening alarm signal is generated; The second response coefficient threshold is smaller than the first response coefficient threshold.

6. The cable health status identification method according to claim 2, characterized in that: The method further comprises: When it is determined that the cable clamp is loose, determining the distance offset between the peak temperature of the cable body within 24 hours and the peak temperature of the environment within 24 hours; When the distance offset is greater than a first threshold distance, generating a slip warning signal; When the distance offset is greater than a second threshold distance, generating a slip alarm signal; The first threshold distance is smaller than the second threshold distance.

7. The cable health status identification method according to claim 4, characterized in that: When the damage type of the cable body is cable body corrosion, the method further comprises: Determine the minimum temperature response coefficient and the maximum response hysteresis coefficient at the concave; Determining whether the minimum temperature response coefficient is less than a second response coefficient threshold, and whether the maximum response hysteresis coefficient is greater than a second hysteresis coefficient threshold; When the minimum temperature response coefficient is less than the second response coefficient threshold, and the maximum response hysteresis coefficient is greater than the second hysteresis coefficient threshold, a corrosion warning signal is generated; Determining whether the minimum temperature response coefficient is less than a third response coefficient threshold, and whether the maximum response hysteresis coefficient is greater than a third hysteresis coefficient threshold; When the minimum temperature response coefficient is less than a third response coefficient threshold, and the maximum response hysteresis coefficient is greater than the third hysteresis coefficient threshold, a corrosion alarm signal is generated; The second response coefficient threshold is greater than the third response coefficient threshold, and the second hysteresis coefficient threshold is less than the third hysteresis coefficient threshold.

8. The cable health status identification method according to claim 7, characterized in that: When the damage type of the cable body is damage to the wrapping layer, the method further comprises: Determine the peak value of the temperature response coefficient and the valley value of the response hysteresis coefficient; Determine whether the temperature response coefficient peak value is greater than a fourth response coefficient threshold value, and whether the response hysteresis coefficient valley value is less than a fourth hysteresis coefficient threshold value; When the temperature response coefficient peak value is greater than the fourth response coefficient threshold value, and the response hysteresis coefficient valley value is less than the fourth hysteresis coefficient threshold value, a wrapping layer damage warning signal is generated; Determine whether the temperature response coefficient peak value is greater than a fifth response coefficient threshold value, and whether the response hysteresis coefficient valley value is less than a fifth hysteresis coefficient threshold value; When the temperature response coefficient peak value is greater than the fifth response coefficient threshold value, and the response hysteresis coefficient valley value is less than the fifth hysteresis coefficient threshold value, a wrapping layer damage alarm signal is generated; The fourth response coefficient threshold is smaller than the fifth response coefficient threshold, and the fourth hysteresis coefficient threshold is larger than the fifth hysteresis coefficient threshold.

9. A cable health status identification device, characterized in that: The cable comprises a cable clamp and a cable body, and the device comprises: A temperature data acquisition unit, used to acquire cable temperature data and ambient temperature data of the cable; a cable body damage determination unit, configured to determine whether the cable body is damaged based on the cable temperature data; a cable clamp loosening determination unit, configured to determine a temperature response coefficient and a response hysteresis coefficient of the cable based on the cable temperature data and the ambient temperature data, and to determine whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient; The temperature response coefficient is used to characterize the amplitude of temperature change, and the response hysteresis coefficient is used to characterize how fast the temperature reaches a peak or a trough; Determining whether the cable clamp is loose based on the temperature response coefficient and the response hysteresis coefficient includes: Determining whether the temperature response coefficient is less than a first response coefficient threshold and whether the response hysteresis coefficient is greater than a first hysteresis coefficient threshold; When the temperature response coefficient is less than a first response coefficient threshold, and the response hysteresis coefficient is greater than a first hysteresis coefficient threshold, it is determined that the cable clamp is loose, and a loosening warning signal is generated.

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