A system and method for evaluating the performance of a flame-retardant cable based on aging tests

Abstract

The application relates to the field of performance evaluation techniques, and particularly discloses a kind of flame-retardant cable performance evaluation system and method based on aging test, the system comprises the following steps: setting a plurality of collection points, obtaining target factors on the collection points, and mapping the degree of target factors into target values;Generating coordinate points based on target values, obtaining fitting curves based on coordinate points, and dividing flame-retardant cables into a plurality of line sections based on the similarity between fitting curves;Aging the flame-retardant cable sample to obtain a target sample, performing performance evaluation on the target sample to obtain a performance score;Determining a target degree, predicting a time point t1 at which the aging degree of the flame-retardant cable reaches the target degree, and providing a prompt based on the time point t1.The application optimizes maintenance resources through segmented monitoring and ensures operation safety.

Description

Technical Field

[0001] This invention relates to the field of performance evaluation technology, and specifically to a performance evaluation system and method for flame-retardant cables based on aging tests. Background Technology

[0002] Flame-retardant cables are cables that, under specified test conditions, when burned and the fire source is removed, have their flame spread only within a limited range, and their residual flames or embers extinguish themselves within a limited time. Their fundamental characteristic is that they may be burned and unable to operate in a fire, but they can prevent the spread of fire.

[0003] By artificially accelerating aging methods (such as a combination of high temperature, humidity, ultraviolet light, chemical corrosion, and mechanical stress), the cable material is pushed to a state equivalent to the late stage of long-term service. The aged samples are then re-examined from multiple dimensions, including flame retardancy, smoke toxicity, electrical and mechanical properties, to determine whether the cable can maintain its flame retardancy and safe power supply performance under real working conditions.

[0004] However, this approach ignores the spatial differences in aging factors across different sections of the flame-retardant cable during actual operation. In real-world installation environments, the same flame-retardant cable may first pass through a temperature-controlled equipment room, then through a high-humidity shaft, and finally be exposed to outdoor cable trays exposed to sun and rain. The intensity and combination of temperature, humidity, ultraviolet, chemical, and mechanical stresses experienced by each section are completely different. Accelerated aging tests place the samples under a set of uniform extreme conditions, which "averages" these differences, causing the early degradation of the most vulnerable sections to be masked. Summary of the Invention

[0005] The purpose of this invention is to provide a performance evaluation system and method for flame-retardant cables based on aging tests, thereby solving the aforementioned technical problems.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for evaluating the performance of flame-retardant cables based on aging tests includes the following steps:

[0008] Several sampling points are set at preset distance intervals on the flame-retardant cable to obtain the target factors at the sampling points. The target factors are the factors that affect the performance of the flame-retardant cable. The degree of the target factors is mapped to the target value.

[0009] Coordinate points are generated based on the target value, fitted curves are obtained based on the coordinate points, and the flame-retardant cable is divided into several line segments based on the similarity between the fitted curves.

[0010] Flame-retardant cable samples are obtained by sampling flame-retardant cables within a single line segment. The flame-retardant cable samples are then aged based on preset aging factors to obtain flame-retardant cable samples with different aging degrees, which are recorded as target samples. The performance of the target samples is then evaluated to obtain performance scores.

[0011] The lowest aging degree among the target samples with performance scores greater than the preset value is recorded as the target degree. The time point t1 when the aging degree of the flame-retardant cable reaches the target degree is predicted, and a prompt message is sent to the preset management personnel at time point t1.

[0012] As a further aspect of the present invention: dividing the flame-retardant cable into several line segments includes:

[0013] Generate coordinate points (D1, D2, ..., Dn), where Dn represents the target value of the nth target factor and n represents the number of target factors. Fit the coordinate points of the same collection point at different time points to obtain the fitting curve.

[0014] The collection points are sorted in descending order according to the distance between them and the starting point of the flame-retardant cable. The fitted curves are then sorted according to the sorting order of the corresponding collection points to obtain the curve sorting.

[0015] The fitted curves are grouped based on their order and similarity, and the line segments are obtained based on the connection areas of the collection points corresponding to the fitted curves in the group.

[0016] As a further aspect of the present invention: the line segment obtained from the connection region of the acquisition points corresponding to the fitted curves in the grouping includes:

[0017] S1: Obtain the similarity P12 between the first fitted curve A1 in the curve ranking and the second fitted curve A2 in the ranking. If the similarity P12 is greater than or equal to the preset similarity threshold, then execute S2; if the similarity P12 is less than the preset similarity threshold, then execute S3.

[0018] S2: Group the fitted curves A1 and A2 into the same group, remove the fitted curve A1 from the curve sorting to obtain a new curve sorting, and repeat S1.

[0019] If a fitted curve is not found in a new curve sort, proceed to step S4.

[0020] S3: If the similarity P12 is less than or equal to the preset similarity threshold, then the fitted curve A1 will be grouped separately, and the fitted curve A1 will be removed from the curve sorting to obtain a new curve sorting, and S1 will be repeated.

[0021] If a fitted curve is not found in a new curve sort, proceed to step S4.

[0022] S4: Obtain the midpoint Z1 between sampling point i on the flame-retardant cable and the adjacent previous sampling point i-1, and obtain the midpoint Z2 between sampling point i on the flame-retardant cable and the adjacent next sampling point i+1. Then the connection area of ​​sampling point i is [Z1, Z2].

[0023] Obtain the union of the connection regions of all the sampling points corresponding to the fitted curves in a single group, and use it as a line segment.

[0024] As a further aspect of the present invention: the aging factors include:

[0025] Obtain the degree of influence of the target factors on the performance of flame-retardant cables, and normalize the degree of influence to obtain the influence value;

[0026] Obtain the fitted curve corresponding to the line segment, denoted as the aging curve, and obtain the target value Dxy of the y-th target factor corresponding to point x on the aging curve. If... Then point x is taken as an outlier of the y-th target factor, Py represents the influence value of the y-th target factor, and P' represents the preset judgment threshold.

[0027] Obtain the total number of anomalies for the y-th target factor. If the number is less than the preset threshold, then the y-th target factor is used as the aging factor for the corresponding road segment.

[0028] As a further aspect of the present invention: obtaining the performance score includes:

[0029] Obtain a target sample A with an aging degree of a, collect the performance factors of the target sample A, the performance factors are the factors reflecting the performance of the flame-retardant cable, and preprocess the performance factors to obtain performance indicators.

[0030] The performance score of target sample A is obtained based on a pre-trained performance scoring model and performance metrics.

[0031] As a further aspect of the present invention: the time point t1 for predicting the aging degree of the flame-retardant cable to reach the target degree includes:

[0032] The target degree and the current aging degree of the flame-retardant cable are mapped to aging scores K1 and K2, respectively.

[0033] Time point t1 is determined based on aging score K1 and aging score K2.

[0034] A flame-retardant cable performance evaluation system based on aging tests includes:

[0035] Data Acquisition Module: Several data acquisition points are set at preset intervals on the flame-retardant cable to acquire target factors at the data acquisition points. The target factors are the factors that affect the performance of the flame-retardant cable. The degree of the target factors is mapped to the target value.

[0036] Aggregation module: Generates coordinate points based on target values, obtains fitted curves based on coordinate points, and divides flame-retardant cables into several line segments based on the similarity between fitted curves;

[0037] The scoring module: Flame-retardant cables within a single line segment are sampled to obtain flame-retardant cable samples. Based on preset aging factors, the flame-retardant cable samples are aged to obtain flame-retardant cable samples with different aging degrees, which are recorded as target samples. The performance of the target samples is evaluated to obtain a performance score.

[0038] Early warning module: Record the lowest aging degree among the target samples with performance scores greater than the preset value as the target degree, predict the time point t1 when the aging degree of the flame-retardant cable reaches the target degree, and send a prompt message to the preset management personnel at time point t1.

[0039] The beneficial effects of this invention are:

[0040] 1. This invention first performs curve fitting on the multi-factor data collected from the collection points and automatically groups them according to similarity. It then maps the characteristics of the same cable under different laying environments, such as temperature, humidity, ultraviolet radiation, chemical stress, and mechanical stress, into independent line segments. Next, it uses the connection area to accurately define the boundaries between segments, so that actual sections such as constant temperature equipment room segments, high humidity vertical shaft segments, and outdoor cable tray segments maintain physical independence in the model, thereby avoiding information masking caused by the average sampling of the entire cable.

[0041] 2. After the line segment division is completed, the present invention uses outlier point statistics to extract the dominant aging factors of each segment, and configures differentiated accelerated aging conditions for the samples accordingly, realizing parallel testing of multiple formulations. This avoids the drawback of averaging multiple stresses in a single extreme environment, making the experimental aging mechanism highly consistent with the actual field conditions, and significantly improving the comparability and prediction accuracy of the results to the actual service conditions.

[0042] 3. This invention establishes an aging degree-remaining life mapping, and generates independent early warning time points and maintenance windows for each line segment through segmented threshold judgment and time extrapolation. Maintenance personnel can prioritize the handling of potentially weak sections based on the prompts, rationally allocate maintenance resources, and reduce the cost waste and downtime risk caused by overall replacement. Attached Figure Description

[0043] The invention will now be further described with reference to the accompanying drawings.

[0044] Figure 1 This is a flowchart illustrating a method for evaluating the performance of flame-retardant cables based on aging tests, according to the present invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figure 1 As shown, this invention is a method for evaluating the performance of flame-retardant cables based on aging tests, comprising the following steps:

[0047] Step 1: Set up collection points on the flame-retardant cable, acquire the target factors at the collection points, and map them to target values;

[0048] In a specific embodiment, after the flame-retardant cable is laid, based on the site space conditions and the diagnostic accuracy requirements set by the maintenance party, several collection points are first delineated along the cable length direction according to the principle of equal spacing. For example, at the junction of the transition section from the computer room to the shaft and the outdoor cable tray section, each point is located at an integer multiple of the distance. In order to avoid missed detections and to avoid redundancy, the spacing is set to a value that can cover the minimum environmental change scale of the cable.

[0049] At each sampling point, target factors are collected, including but not limited to temperature, ambient humidity, ultraviolet radiation, surface current leakage, and local chemical corrosion rate. Since the sensitivity of different factors to performance varies greatly due to their different dimensions and numerical ranges, they cannot be directly compared. Therefore, a unified reference interval is selected, and each physical quantity is dimensionless to the interval of 0 to 1 or 0 to 100 by linear, logarithmic, or empirical segmentation to obtain the target value, so that incompatible physical units are converted into horizontally comparable data of the same dimension.

[0050] Step 2: Generate coordinate points based on the target value, obtain the fitted curve based on the coordinate points, and divide the flame-retardant cable into several line segments based on the similarity between the fitted curves;

[0051] In a preferred embodiment of the present invention, dividing the flame-retardant cable into several line segments includes:

[0052] The target values ​​obtained from the same collection point on different detection dates are combined into a series of vectors. For example, the temperature, humidity, and UV target values ​​of a certain point in the computer room during thirty detections constitute thirty sets of coordinates. These discrete coordinates can be fitted with splines or least squares polynomials in the order of time to depict the continuous curve of environmental change at that point. Since the components in the vector have been normalized, the vertical axis of the curve can directly reflect the overall environmental strength.

[0053] The actual mileage from each collection point to the starting point is measured along the cable using a measuring wheel. To avoid cross-segment interference caused by comparing the far end first and then the near end, the collection points are listed in descending order of mileage. Then, the corresponding fitting curves are arranged in this order to obtain the curve sorting table.

[0054] Starting from the top of the table, calculate the similarity between the first curve and the next curve. For example, take the values ​​of the two curves at the same time grid and calculate the Euclidean distance. The smaller the distance, the higher the similarity. If the similarity exceeds a pre-selected threshold, it means that the fluctuation patterns of the two environments over time are similar, and they can be considered to be controlled by the same type of stress combination. So the two curves are grouped into the same group, and the first curve is removed from the sorting table and the comparison continues. If the similarity does not exceed the threshold, the first curve is grouped separately, and it is removed and compared again until the sorting table is empty.

[0055] After grouping, each sampling point in the group is connected to its upper and lower adjacent sampling points and the geometric midpoint is taken. The closed interval enclosed by these two midpoints can be regarded as the coverage range of the environmental impact of the sampling point on the cable. The multi-point interval is connected into a piece, which is the line segment corresponding to the group. If the distance between adjacent sampling points is not equal, the midpoint method can still maintain seamless splicing in physical space.

[0056] It should be noted that using multi-factor curves synchronized with time to truly present the comprehensive changes of the local environment over the service life, and measuring the environmental homogeneity between collection points by curve similarity rather than a single instantaneous value, can automatically aggregate sections affected by similar stress combinations. At the same time, the midpoint method is used to cut the sections on the physical coordinates to ensure that the section boundaries are both complete and non-overlapping. This establishes an objective basis that conforms to both environmental mechanisms and spatial topology for subsequent differentiated aging tests and section-level performance assessments. This allows the final life prediction to be based on truly homogeneous cable segments rather than lengths subjectively divided by humans, improving the relevance and credibility of the evaluation results in actual operation and maintenance.

[0057] Step 3: Sample the flame-retardant cable within a single line segment to obtain a flame-retardant cable sample, and then age the flame-retardant cable sample to obtain the target sample.

[0058] In one specific embodiment, an indoor-outdoor performance-environment correlation test is performed on the flame-retardant cable sample. By gradually increasing the temperature, humidity, ultraviolet radiation dose, and applying chemical or mechanical loads, the rate of decrease of indicators such as insulation resistance, dielectric strength, and tensile modulus is measured in real time. The magnitude of the rate of decrease is used to assess the degree of influence of each target factor on the cable performance. Then, these slopes are linearly scaled according to the maximum value so that each factor has an influence value between zero and one.

[0059] In the aging curve, select any moment corresponding to a certain test as point x, read the dimensionless target value Dxy of the y-th factor, and multiply it with the influence value Py. This product represents the instantaneous load that factor causes to the performance at that time. If the product is lower than the preset threshold P', it means that the load of the factor is temporarily light, so the moment is recorded as the outlier of the factor. Count the number of outliers of the factor on the entire aging curve. If the number is lower than the preset threshold, it means that the product of the factor is higher than the threshold at most moments, its destructive effect remains high and persistent, so the factor is identified as the aging factor.

[0060] All aging factors were obtained. Temperature control, humidity control, ultraviolet irradiation and chemical atmosphere modules were installed in the test chamber with multi-functional loading capabilities. The sensors of each module were calibrated to ensure that the readings were consistent with the actual field strength.

[0061] The sampled cable specimens were suspended or fixed one by one on the test frame so that all surfaces of them were evenly irradiated and washed by the airflow.

[0062] Before the formal start of the test, the temperature of the constant temperature chamber is set to the highest stable temperature monitored on site according to the peak and sustained range of each stress factor on the aging curve. The dew point of the humidification system is adjusted to the corresponding humidity peak range. The ultraviolet lamp group is turned on so that the irradiation intensity reaches the high level of the curve. If the list also includes chemical or mechanical factors, corrosive gases or periodic bending devices are added accordingly.

[0063] The samples are placed into the chamber in batches according to the pre-arranged time gradient. For example, the first batch is taken out after being continuously loaded for several hours and is numbered "initial aging". The second batch is loaded for a longer time and is numbered "intermediate aging". The remaining batches are carried out in the same way until "heavy aging" is reached. Throughout the process, the stress levels are kept constant, and only the exposure time is changed to accumulate different aging damage to obtain the target sample.

[0064] Step 4: Evaluate the performance of the target sample and obtain a performance score;

[0065] In another preferred embodiment of the present invention, obtaining the performance score includes:

[0066] Sheath and conductor segments were cut from target sample A (grade a) and tested for electrical properties such as insulation resistance, breakdown voltage, and dielectric loss angle according to electrical standards. At the same time, tensile strength and elongation at break were measured on a tensile tester, and limiting oxygen index and smoke density were measured in an oxygen index chamber to characterize flame retardancy and smoke generation characteristics. The glass transition temperature and thermogravimetric initiation temperature were measured using a differential scanning calorimeter to assess thermal stability. All original readings were recorded together with test environment information such as room temperature and relative humidity.

[0067] For these raw data from different sources and with different dimensions, outliers that exceed the reasonable physical range are first removed. Then, a baseline is established based on the same batch of blank samples or new samples. Each value is converted into a relative retention rate or decay rate so that each index reflects the performance in the same direction. Then, interval scaling or z-score processing is performed to obtain a dimensionless performance index vector.

[0068] This vector is input into a performance scoring model that was previously trained with a large amount of measured data from in-service and decommissioned cables. The model internally maps multi-dimensional performance indicators to historical life outcomes through weighted aggregation or nonlinear mapping, and outputs a single-axis score. The higher the score, the greater the likelihood that the sample can still be safely in service.

[0069] The training performance scoring model includes:

[0070] Establish database storage performance metrics and assign performance scores to these metrics manually.

[0071] A performance scoring model is established based on deep learning. The performance scoring model is trained and validated based on performance metrics with labeled performance scores in the database.

[0072] Step 5: Record the lowest degree of aging among the target samples with performance scores greater than the preset value as the target degree, predict the time point t1 when the aging degree of the flame-retardant cable reaches the target degree, and send a prompt message to the preset management personnel at time point t1.

[0073] In another preferred embodiment of the present invention, the time point t1 for predicting the aging degree of the flame-retardant cable to reach the target degree includes:

[0074] Sort the paired data of "aging degree - performance score" in the laboratory records from high to low according to the performance score. Find the first record that is still higher than the safety threshold to determine the target degree. Use the subsequent maximum aging degree as the full-scale endpoint and use a linear scale to map the interval to a percentage system so that the target degree is constant and corresponds to an aging score of 100. Lighter states are below 100 and heavier states are above 100.

[0075] The current aging level is calculated in real time through online monitoring on site. The value is substituted into the same scale to obtain the current aging score K2. Since the mapping basis is completely consistent, K2 can be directly compared with the target score K1 (one hundred).

[0076] Retrieve the dates of several past inspections and their aging levels at that time, convert them into scores, plot a time-score scatter plot, and then fit a trend line using the least squares method. The slope represents the aging rate, and the intercept represents the initial state. Then, fix the vertical axis to 100 and substitute it into the trend equation to solve for the intersection point of the horizontal axis, which is the date t1 when the cable will first reach the target level in the future.

[0077] A flame-retardant cable performance evaluation system based on aging tests includes:

[0078] Data Acquisition Module: Several data acquisition points are set at preset intervals on the flame-retardant cable to acquire target factors at the data acquisition points. The target factors are the factors that affect the performance of the flame-retardant cable. The degree of the target factors is mapped to the target value.

[0079] Aggregation module: Generates coordinate points based on target values, obtains fitted curves based on coordinate points, and divides flame-retardant cables into several line segments based on the similarity between fitted curves;

[0080] The scoring module: Flame-retardant cables within a single line segment are sampled to obtain flame-retardant cable samples. Based on preset aging factors, the flame-retardant cable samples are aged to obtain flame-retardant cable samples with different aging degrees, which are recorded as target samples. The performance of the target samples is evaluated to obtain a performance score.

[0081] Early warning module: Record the lowest aging degree among the target samples with performance scores greater than the preset value as the target degree, predict the time point t1 when the aging degree of the flame-retardant cable reaches the target degree, and send a prompt message to the preset management personnel at time point t1.

[0082] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters and thresholds in the formulas are set by those skilled in the art according to the actual situation.

[0083] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A method for evaluating the performance of flame-retardant cables based on aging tests, characterized in that, Includes the following steps: Several sampling points are set at preset distance intervals on the flame-retardant cable to obtain the target factors at the sampling points. The target factors are the factors that affect the performance of the flame-retardant cable. The degree of the target factors is mapped to the target value. Coordinate points are generated based on the target value, fitted curves are obtained based on the coordinate points, and the flame-retardant cable is divided into several line segments based on the similarity between the fitted curves. Flame-retardant cable samples are obtained by sampling flame-retardant cables within a single line segment. The flame-retardant cable samples are then aged based on preset aging factors to obtain flame-retardant cable samples with different aging degrees, which are recorded as target samples. The performance of the target samples is then evaluated to obtain performance scores. The lowest aging degree among the target samples with performance scores greater than the preset value is recorded as the target degree. The time point t1 when the aging degree of the flame-retardant cable reaches the target degree is predicted, and a prompt message is sent to the preset management personnel at time point t1. Setting aging factors includes: Obtain the degree of influence of the target factors on the performance of flame-retardant cables, and normalize the degree of influence to obtain the influence value; Obtain the fitted curve corresponding to the line segment, denoted as the aging curve, and obtain the target value Dxy of the y-th target factor corresponding to point x on the aging curve. If... Then point x is taken as an outlier of the y-th target factor, Py represents the influence value of the y-th target factor, and P' represents the preset judgment threshold. Obtain the total number of anomalies for the y-th target factor. If the number is less than the preset threshold, then the y-th target factor is used as the aging factor for the corresponding line segment.

2. The method for evaluating the performance of flame-retardant cables based on aging tests according to claim 1, characterized in that, The flame-retardant cable is divided into several line segments, including: Generate coordinate points (D1, D2, ..., Dn), where Dn represents the target value of the nth target factor and n represents the number of target factors. Fit the coordinate points of the same collection point at different time points to obtain the fitting curve. The collection points are sorted in descending order according to the distance between them and the starting point of the flame-retardant cable. The fitted curves are then sorted according to the sorting order of the corresponding collection points to obtain the curve sorting. The fitted curves are grouped based on their order and similarity, and the line segments are obtained based on the connection areas of the collection points corresponding to the fitted curves in the group.

3. The method for evaluating the performance of flame-retardant cables based on aging tests according to claim 2, characterized in that, Based on the connection region of the sampling points corresponding to the fitted curves in the grouping, the line segments include: S1: Obtain the similarity P12 between the first fitted curve A1 in the curve ranking and the second fitted curve A2 in the ranking. If the similarity P12 is greater than or equal to the preset similarity threshold, then execute S2; if the similarity P12 is less than the preset similarity threshold, then execute S3. S2: Group the fitted curves A1 and A2 into the same group, remove the fitted curve A1 from the curve sorting to obtain a new curve sorting, and repeat S1. If a fitted curve is not found in a new curve sort, proceed to step S4. S3: If the similarity P12 is less than the preset similarity threshold, then the fitted curve A1 will be grouped separately, and the fitted curve A1 will be removed from the curve sorting to obtain a new curve sorting, and S1 will be repeated. If a fitted curve is not found in a new curve sort, proceed to step S4. S4: Obtain the midpoint Z1 between sampling point i on the flame-retardant cable and the adjacent previous sampling point i-1, and obtain the midpoint Z2 between sampling point i on the flame-retardant cable and the adjacent next sampling point i+1. Then the connection area of ​​sampling point i is [Z1, Z2]. Obtain the union of the connection regions of all the sampling points corresponding to the fitted curves in a single group, and use it as a line segment.

4. The method for evaluating the performance of flame-retardant cables based on aging tests according to claim 1, characterized in that, The performance score includes: Obtain a target sample A with an aging degree of a, collect the performance factors of the target sample A, the performance factors are the factors reflecting the performance of the flame-retardant cable, and preprocess the performance factors to obtain performance indicators. The performance score of target sample A is obtained based on a pre-trained performance scoring model and performance metrics.

5. The method for evaluating the performance of flame-retardant cables based on aging tests according to claim 1, characterized in that, The predicted time point t1 for the flame-retardant cable to reach the target aging level includes: The target degree and the current aging degree of the flame-retardant cable are mapped to aging scores K1 and K2, respectively. Time point t1 is determined based on aging score K1 and aging score K2.

6. A flame-retardant cable performance evaluation system based on aging test, used to implement the flame-retardant cable performance evaluation method based on aging test as described in any one of claims 1-5, characterized in that, include: Data Acquisition Module: Several data acquisition points are set at preset intervals on the flame-retardant cable to acquire target factors at the data acquisition points. The target factors are the factors that affect the performance of the flame-retardant cable. The degree of the target factors is mapped to the target value. Aggregation module: Generates coordinate points based on target values, obtains fitted curves based on coordinate points, and divides flame-retardant cables into several line segments based on the similarity between fitted curves; The scoring module: Flame-retardant cables within a single line segment are sampled to obtain flame-retardant cable samples. Based on preset aging factors, the flame-retardant cable samples are aged to obtain flame-retardant cable samples with different aging degrees, which are recorded as target samples. The performance of the target samples is evaluated to obtain a performance score. Early warning module: Record the lowest aging degree among the target samples with performance scores greater than the preset value as the target degree, predict the time point t1 when the aging degree of the flame-retardant cable reaches the target degree, and send a prompt message to the preset management personnel at time point t1.

Images