Stress monitoring and early warning method and system for roundabout cableway

Abstract

The invention relates to the field of ropeway monitoring, and discloses a roundabout ropeway stress monitoring and early warning method and a roundabout ropeway stress monitoring and early warning system which are used for solving the problem that when a ropeway built in a high-altitude area is monitored, obtained stress data are inaccurate due to regional special environmental factors. Sensors are arranged at cableway cable monitoring points, stress data, load data and image data of all the monitoring points are collected in real time, an initial cableway stress index is obtained through comprehensive analysis and calculation, environment data of the environment where the cableway is located are collected, and adjustment factors are obtained through evaluation according to the environment data; the method comprises the following steps: calculating to obtain an actual cableway stress index according to an initial cableway stress index and an adjustment factor, dynamically adjusting a stress safety threshold according to the adjustment factor to obtain an actual stress safety threshold, and carrying out early warning and reminding according to the actual cableway stress index and the actual stress safety threshold, thereby effectively improving the accuracy of monitoring data. And the cableway safety is improved.

Description

Technical Field

[0001] The present invention relates to the field of cableway monitoring, and more specifically to a force monitoring and early warning method and system for a circuitous cableway. Background Art

[0002] A detour cableway is a special cableway system that is usually used in complex terrains, such as mountains, canyons or high altitude areas. Unlike conventional cableways, it has multiple sections or steering functions, which can bypass obstacles or adjust the route to avoid straight-line crossing of inaccessible areas. By setting up multiple brackets or stations, the detour cableway can achieve line turns or multi-section connections, making it adaptable to complex terrain conditions and transporting passengers or goods more flexibly and safely.

[0003] The force monitoring system for the detour cableway is used to monitor the stress conditions of the components during the operation of the cableway in real time, ensure the safe and stable operation of the system under complex terrain and climatic conditions, prevent the risk of accidents caused by overload, fatigue or uneven local force, extend the service life of the equipment, and provide early warning for timely maintenance and response to potential failures.

[0004] The existing cableway stress monitoring and early warning system mainly collects stress data in real time by installing sensors on key components of the cableway and transmits the data to the monitoring center. The system identifies abnormal stress conditions, such as overload, fatigue or uneven stress, through data analysis and comparison. When the set stress safety threshold is exceeded, an early warning is automatically issued to remind the operator to take measures to avoid accidents and perform timely maintenance.

[0005] For example, the invention patent announcement number is CN212220195U, which discloses a special support for cableway monitoring, including a base frame, a tilting frame and a supporting plate, wherein the base frame includes front and rear left and right pillars, the two ends of the left pillar are fixed to the left ends of the front and rear pillars, the two ends of the right pillar are fixed to the right ends of the front and rear pillars, the two ends of the left pillar extend downward to form left front and left rear support feet respectively, the two ends of the right pillar extend downward to form right front and right rear support feet respectively, the left front, left rear, right front and right rear support feet are provided with locking screws, the middle of the front pillar is fixedly connected with a support rod tilted backward, the tilting frame includes left and right tilting pillars arranged relatively parallel, the lower ends of the left and right tilting pillars are fixed to the rear ends of the left and right pillars, the upper ends of the left and right tilting pillars are pivotally connected with a support shaft, the rear part of the bottom surface of the supporting plate is fixedly connected to the support shaft, the front of the bottom is connected with a support column, the surface of the support column is connected with a sleeve, the upper part of the support rod is sleeved in the sleeve, and the sleeve is provided with a fastening bolt. The present application can fix the measuring equipment used for monitoring cableway displacement to prevent shaking.

[0006] For example, the invention patent with announcement number: CN115675540A announces a cableway support cable-off safety monitoring device, system and method based on optical signals, including a signal transmitting module for sending optical signals using a light-emitting end, a signal receiving module for receiving optical signals using a light-receiving end, a signal transmission module for transmitting optical signals using a transmission optical fiber, a blocking module for blocking optical fiber signals using a U-shaped breaking needle that can block the transmission of optical fiber optical signals, and a positioning module for real-time positioning of the cableway vehicle using a locator installed on the cableway vehicle. The present invention embeds a multi-core optical fiber on the steel cable, and sets the U-shaped breaking needle next to the axle. When the cable is off, the operation of the optical fiber is blocked. The cable-off position can be quickly located by the number and number of the return light beams, which is convenient for managing multiple cable cars at the same time. The overall installation cost of the present invention is low, the weight is small, and it can effectively avoid the risk of lightning strikes, and the danger of the bracket being energized is easy to cause.

[0007] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0008] In the prior art, when a circuitous cableway is constructed in a high-altitude area, the state of the cableway will be affected by the special environmental factors of the region, resulting in inaccurate force data collected by the sensor. If there are damaged cableway components, the damaged cableway components may not be able to withstand the maximum load for which they are designed. Summary of the invention

[0009] In order to overcome the above-mentioned defects of the prior art, the present invention provides a force monitoring and early warning method and system for a circuitous cableway to solve the problems existing in the above-mentioned background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A method for monitoring and early warning of force for a circuitous ropeway comprises the following steps:

[0012] Step 1: Select key parts from the cable as monitoring points, including the turning points, hanging sections and connection nodes of the cable, and set strain gauge sensors at the monitoring points;

[0013] Step 2: The force data of each monitoring point is collected in real time by means of a strain gauge sensor, and the force unevenness is calculated according to the force data of each force monitoring point;

[0014] Step 3: A tension sensor is set at the cable monitoring point, and the load data of each monitoring point is collected in real time through the tension sensor, and the cable overload degree is calculated according to the load data of each monitoring point;

[0015] Step 4: A high-definition camera sensor is set at the cable monitoring point, and the image data of each monitoring point is collected in real time by the high-definition camera sensor. The degree of material damage is obtained by analyzing the image data of each monitoring point through image recognition technology;

[0016] Step 5: The initial cableway stress index is calculated based on the comprehensive evaluation of stress unevenness, cable overload degree and material damage degree;

[0017] Step 6: Collect environmental data of the environment where the ropeway is located, and obtain an adjustment factor based on the environmental data evaluation, and calculate the actual ropeway force index by multiplying the initial ropeway force index by the adjustment factor;

[0018] Step 7: Dynamically adjust the force safety threshold according to the adjustment factor to obtain the actual force safety threshold;

[0019] Step 8: Issue early warning reminders based on the actual cableway stress index and the actual stress safety threshold.

[0020] Preferably, the step of calculating the force unevenness according to the force data of each force monitoring point is:

[0021] During the operation of the cableway, the strain data of each monitoring point in the cable is collected in real time;

[0022] The elastic modulus of the cable material and the cross-sectional area of ​​the cable at the monitoring point are obtained from the cable factory manual, and the strain data, elastic modulus and cross-sectional area of ​​the cable are multiplied to obtain the force at the monitoring point;

[0023] Calculate the average force of all monitoring points;

[0024] The method to obtain the force unevenness based on the force at each monitoring point and the average force at all monitoring points is: UF is the force unevenness. represents the absolute difference between the force at the ith monitoring point and the average force, F i It is represented as the force on the ith monitoring point, It is expressed as the average force of all monitoring points.

[0025] Preferably, the step of calculating the cable overload degree according to the load data of each monitoring point is:

[0026] The load at each monitoring point is measured in real time by a tension sensor, and the maximum design load at each monitoring point is obtained based on the data provided by the cable manufacturer;

[0027] The overload degree of each monitoring point is obtained by calculating the ratio of the load of each monitoring point to the maximum design load of the monitoring point;

[0028] The overload degree of each monitoring point is averaged and the overload degree of the cable is obtained.

[0029] Preferably, the step of analyzing the image data of each monitoring point by image recognition technology to obtain the degree of material damage is:

[0030] Preprocessing the image data of each monitoring point collected by the high-definition camera sensor, wherein the preprocessing includes noise processing, contrast enhancement, and edge enhancement;

[0031] Using image recognition technology to extract key damage features, the damage features include crack length, crack width and number of broken wires, the crack length is the sum of the lengths of all cracks in the image, and the crack width is the sum of the widths of all cracks in the image;

[0032] The crack length, crack width and number of broken wires are normalized, and the normalized crack length, crack width and number of broken wires are comprehensively evaluated through nonlinear combination to obtain the degree of material damage.

[0033] Preferably, the step of collecting environmental data of the environment in which the ropeway is located and obtaining the adjustment factor based on the environmental data is:

[0034] The altitude of the environment where the ropeway is located is obtained, the air density is calculated according to the altitude, the ultraviolet intensity of the environment where the ropeway is located is measured by ultraviolet detection equipment, and the coating aging coefficient is obtained according to the air density and ultraviolet intensity. Where CA is the coating aging coefficient, α is the proportionality coefficient, representing the basic aging rate of the coating, and the proportionality coefficient is obtained from the coating manufacturer. UV (h) is the ultraviolet intensity, ρ is the air density;

[0035] Obtain the temperature data of the environment where the cableway is located, and calculate the temperature difference damage coefficient based on the temperature data;

[0036] The method to obtain the adjustment factor according to the coating aging coefficient and the temperature difference damage coefficient is AF=a1×CA+a2×DG, where AF is represented as the adjustment factor, CA is represented as the coating aging coefficient, DG is represented as the temperature difference damage coefficient, and a1 and a2 are represented as the weight coefficients of the coating aging coefficient and the temperature difference damage coefficient.

[0037] Preferably, the step of obtaining the temperature data of the environment in which the cableway is located and calculating the temperature difference damage coefficient according to the temperature data is:

[0038] Obtain temperature data of the environment where the ropeway is located during the detection period;

[0039] Calculate the maximum temperature difference of each day, which is the difference between the daily maximum temperature and the daily minimum temperature, and calculate the average of the maximum temperature differences of each day within the detection period to obtain an average temperature difference;

[0040] Obtain the fatigue coefficient of the cable material and the exponential coefficient of temperature difference damage by referring to relevant material standards;

[0041] The method for obtaining the temperature difference damage coefficient based on the average temperature difference value, the fatigue coefficient of the material and the exponential coefficient of temperature difference damage is as follows: Where DG represents the temperature difference damage coefficient, β represents the fatigue coefficient of the material, R represents the exponential coefficient of temperature difference damage, PT represents the average temperature difference value, and T0 represents the reference temperature.

[0042] Preferably, the step of dynamically adjusting the safety threshold of the force to be used according to the adjustment factor to obtain the actual safety threshold of the force to be used is:

[0043] An adjustment factor threshold is set, and the current adjustment factor is compared with the adjustment factor threshold. If the current adjustment factor is less than the adjustment factor threshold, it is determined that the deviation between the actual force condition of the cableway component and the force condition measured by the sensor is small, and the force safety threshold is not adjusted; if the current adjustment factor is greater than the adjustment factor threshold, it is determined that the deviation between the actual force condition of the cableway component and the force condition measured by the sensor is large, and the force safety threshold is adjusted to obtain the actual force safety threshold.

[0044] Preferably, the actual force safety threshold calculation step is:

[0045] An initial force safety threshold is set. When the current adjustment factor is greater than the adjustment factor threshold, the adjustment factor threshold is calculated by ratio with the current adjustment factor to obtain the deviation coefficient.

[0046] The initial force safety threshold is multiplied by the deviation coefficient to obtain the actual force safety threshold.

[0047] Preferably, the step of providing an early warning reminder based on the actual cableway stress index and the actual stress safety threshold is:

[0048] The actual cableway stress index is compared with the actual stress safety threshold. If the actual cableway stress index is less than the actual stress safety threshold, it is determined that the current cableway is in good condition and no early warning is issued; if the actual cableway stress index is greater than the actual stress safety threshold, it is determined that the current cableway has a large load and is prone to accidents, so an early warning is issued.

[0049] Preferably, a force monitoring and early warning system for a circuitous cableway comprises:

[0050] A cableway force data acquisition module is used to collect the cableway force data through sensors and transmit the cableway force data to the initial cableway force evaluation module;

[0051] The initial cableway force evaluation module is used to receive the cableway cable force data transmitted by the cableway force data acquisition module, and to comprehensively evaluate the force data to obtain an initial cableway force index, and to transmit the initial cableway force index to the cableway force adjustment module;

[0052] A cableway force adjustment module is used to receive the initial cableway force index transmitted by the initial cableway force evaluation module, collect the environmental information of the cableway, adjust the initial cableway force index according to the environmental information of the cableway, obtain the actual cableway force index, and transmit the actual cableway force index to the safety warning module;

[0053] A stress safety threshold adjustment module is used to adjust the stress safety threshold according to the environmental information of the ropeway, obtain the actual stress safety threshold, and transmit the actual stress safety threshold to the safety warning module;

[0054] The safety warning module is used to receive the actual cableway force index and the actual force safety threshold transmitted by the cableway force adjustment module and the force safety threshold adjustment module, and to issue a warning reminder based on the actual cableway force index and the actual force safety threshold.

[0055] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0056] 1. Sensors are installed at the cable monitoring points of the cableway to collect the force data, load data and image data of each monitoring point in real time, and the initial cableway force index is obtained through comprehensive analysis and calculation, so as to effectively monitor the cableway in real time and obtain the comprehensive cableway status.

[0057] 2. Collect environmental data of the environment in which the cableway is located, and obtain adjustment factors based on environmental data evaluation. The actual cableway force index is calculated based on the initial cableway force index and the adjustment factor, which effectively reduces the deviation of sensor data collection caused by environmental factors.

[0058] 3. Dynamically adjust the force safety threshold according to the adjustment factor to obtain the actual force safety threshold. Without dynamic adjustment, the safety threshold is often fixed, which may be too conservative or overly risky. In an ideal environment, the fixed threshold may not fully utilize the carrying capacity of the cableway; in a harsh environment, the fixed threshold may overestimate the carrying capacity of the cableway. Dynamic adjustment of the threshold can flexibly respond to different environmental conditions, avoid this problem, and improve operational efficiency and safety.

[0059] 4. Provide early warning reminders based on the actual cableway stress index and the actual stress safety threshold to promptly detect unsafe cableway conditions and effectively improve cableway safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is the overall flow chart of the present invention.

[0061] Figure 2 It is the overall structure diagram of the present invention. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The force monitoring and early warning method and system for a detour cableway involved in the present invention are not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0063] The present invention provides a force monitoring and early warning method for a circuitous ropeway, comprising the following steps:

[0064] Step 1: Select key parts from the cable as monitoring points, including the turning points, hanging sections, and connection nodes of the cable, and set strain gauge sensors at the monitoring points;

[0065] Step 2: The force data of each monitoring point is collected in real time by means of a strain gauge sensor, and the force unevenness is calculated according to the force data of each force monitoring point;

[0066] The strain gauge sensor is a sensor used to measure the strain (deformation) of a material or structure under the action of an external force. It is usually made of sensitive materials, and when subjected to mechanical stress, its resistance will change. By measuring the change in resistance, the strain value of the material can be inferred, thereby evaluating its stress state. Strain gauges are widely used in civil engineering, mechanical engineering, aerospace and other fields to monitor and evaluate the safety and performance of structures.

[0067] In this embodiment, it should be specifically explained that the step of calculating the force unevenness according to the force data of each force monitoring point is:

[0068] During the operation of the cableway, the strain data of each monitoring point in the cable is collected in real time and usually recorded in the form of time series;

[0069] The elastic modulus of the cable material and the cross-sectional area of ​​the cable at the monitoring point are obtained from the cable factory manual, and the force at the monitoring point is obtained according to the strain data, elastic modulus and cross-sectional area of ​​the cable as F. i =E×A×ε i , where F i It is expressed as the force at the i-th monitoring point, E is the elastic modulus of the cable material, A is the cross-sectional area of ​​the cable at the monitoring point, ε i Represented as the strain data of the i-th monitoring point;

[0070] Calculate the average force of all monitoring points using in It is expressed as the average force of all monitoring points, and n is the number of monitoring points;

[0071] The method to obtain the force unevenness based on the force at each monitoring point and the average force at all monitoring points is: UF is the force unevenness. Represents the absolute difference between the force at the ith monitoring point and the average force.

[0072] Step 3: A tension sensor is set at the cable monitoring point, and the load data of each monitoring point is collected in real time through the tension sensor, and the cable overload degree is calculated according to the load data of each monitoring point;

[0073] The tension sensor is a sensing device used to measure the tension (tension) borne by an object or structure. It converts the mechanical tension generated when the object is subjected to force into an electrical signal, thereby monitoring and recording the force in real time. Tension sensors are widely used in engineering, machinery, bridges, cableways and other fields to evaluate the load status of equipment, ensure that the structure operates within a safe range, and can promptly warn of overload or abnormal force.

[0074] In this embodiment, it should be specifically explained that the step of calculating the cable overload degree according to the load data of each monitoring point is:

[0075] The load of each monitoring point is measured in real time by a tension sensor. The maximum design load of each monitoring point is obtained according to the data provided by the cable manufacturer. The overload degree of each monitoring point is calculated by calculating the ratio of the load of each monitoring point to the maximum design load of the monitoring point. The method is as follows: Among them, i It is expressed as the load level of the i-th monitoring point, H i It is expressed as the load of the i-th monitoring point, H max,i It is expressed as the maximum design load of the ith monitoring point;

[0076] The overload degree of each monitoring point is averaged to obtain the overload degree of the cable. The method is: Where OL is the overload degree of the cable, O i It is expressed as the load degree of the i-th monitoring point, and n is the number of monitoring points.

[0077] Step 4: A high-definition camera sensor is set at the cable monitoring point, and the image data of each monitoring point is collected in real time by the high-definition camera sensor. The degree of material damage is obtained by analyzing the image data of each monitoring point through image recognition technology;

[0078] The image recognition technology is a technology in the field of computer vision that aims to identify and extract useful information by analyzing and understanding digital images. The technology uses machine learning and deep learning algorithms to train models to detect and classify objects, shapes, features and patterns in images. In cable monitoring, image data captured by high-definition camera sensors can be processed to identify and evaluate cracks, corrosion, wear and ice and snow coverage on the cable surface. Through image recognition technology, automatic monitoring and evaluation of the degree of cable damage can be achieved, improving the efficiency and accuracy of monitoring.

[0079] In this embodiment, it should be specifically explained that the step of obtaining the degree of material damage by analyzing the image data of each monitoring point through image recognition technology is as follows:

[0080] Preprocessing the image data of each monitoring point collected by the high-definition camera sensor, the preprocessing includes noise processing, contrast enhancement and edge enhancement, highlighting the features of the cable surface and making the damaged area clearer;

[0081] Using image recognition technology to extract key damage features, the damage features include crack length, crack width and number of broken wires, the crack length is the sum of the lengths of all cracks in the image, and the crack width is the sum of the widths of all cracks in the image;

[0082] The crack length, crack width and number of broken wires are normalized, and the method for obtaining the degree of material damage through nonlinear combination of the normalized crack length, crack width and number of broken wires is as follows: Where MF represents the degree of material damage, is the crack length, Expressed as crack width, It is expressed as the number of broken wires and is comprehensively evaluated using nonlinear combinations, which preserves the independence of each feature while taking their superposition effects into account.

[0083] Step 5: The method for obtaining the initial cableway stress index based on the stress unevenness, cable overload degree and material damage degree is: Among them, CF represents the initial cableway force index, UF represents the force unevenness, OL represents the cable overload degree, and MF represents the material damage degree;

[0084] Step 6: Collect the environmental data of the environment where the ropeway is located, and obtain the adjustment factor based on the environmental data evaluation. The method for obtaining the actual ropeway force index based on the initial ropeway force index and the adjustment factor is CF 实际 =CF×AF, where CF 实际 It is represented as the actual ropeway force index, CF is represented as the initial ropeway force index, and AF is represented as the adjustment factor;

[0085] Extreme environmental factors at high altitudes, such as thin air, large temperature differences, strong ultraviolet radiation, and strong winds, can have a profound impact on the structure and operation of the cableway, and these impacts often cannot be directly detected by ordinary sensors.

[0086] Thin air will lead to lower air density, affecting the heat dissipation and strength of metal parts such as cables and brackets, and accelerating material fatigue and aging. Large temperature differences will cause repeated expansion and contraction of materials, increasing the thermal stress concentration effect, which may cause the generation and expansion of metal microcracks. Strong ultraviolet radiation will accelerate material aging, especially the degradation of protective materials such as coatings and rubber, thereby reducing the durability of cableway components.

[0087] In this embodiment, it should be specifically explained that the steps of collecting environmental data of the environment in which the ropeway is located and obtaining the adjustment factor according to the environmental data are:

[0088] Get the altitude of the cableway environment and get the air density based on the altitude. The method is: Where ρ represents the air density, ρ0 is the air density at sea level, which is approximately 1.225 kg / m 3 , h is the altitude, T0 is the sea level temperature, the standard value is 288.15K, g is the acceleration of gravity, usually 9.81m / s 2 , L is the temperature lapse rate, which is about 0.0065K / m, R is the gas constant, which is usually 287.05J / (kg·K), M is the molar mass of air, which is about 0.029kg / mol, and the ultraviolet intensity of the environment where the cableway is located is measured by ultraviolet detection equipment. The method for obtaining the coating aging coefficient based on air density and ultraviolet intensity is as follows: Where CA is the coating aging coefficient, α is the proportionality coefficient, representing the basic aging rate of the coating, and the proportionality coefficient is obtained from the coating manufacturer. UV (h) is the ultraviolet intensity, ρ is the air density;

[0089] Obtain the temperature data of the environment where the cableway is located, and calculate the temperature difference damage coefficient based on the temperature data;

[0090] The method to obtain the adjustment factor based on the coating aging coefficient and the temperature difference damage coefficient is AF = a1 × CA + a2 × DG, where AF is expressed as the adjustment factor and CA is expressed as the coating aging coefficient. The degree of coating aging will affect the adjustment of the stress condition of the cableway. As the degree of coating aging increases, the protective performance of the surface of the cableway structure decreases, which may cause cables, brackets and other components to bear greater external stress. This relationship shows that coating aging will directly aggravate the stress condition of the cableway. Therefore, when evaluating the stress of the cableway, it is necessary to consider the impact of coating aging on the overall stress. DG is expressed as the temperature difference damage coefficient. The thermal expansion and contraction effect of the cableway material will directly affect its stress state. As the temperature difference changes, the material expands or contracts, causing changes in the stress of the cable structure. When the temperature difference increases, the shrinkage and expansion coefficient of the material increases, and the stress state of the cableway becomes more intense. It is necessary to compensate or adjust through the stress index adjustment factor to ensure the operation stability and safety of the system under different temperature conditions. Therefore, the structural design and monitoring system of the cableway must take into account the dynamic influence of temperature changes on the stress. a1 and a2 are expressed as the weight coefficients of the coating aging coefficient and the temperature difference damage coefficient, and a1+a2=1. The specific values ​​of a1 and a2 are determined by professionals according to the actual situation. For example, a1 and a2 can be 0.4 and 0.6.

[0091] In this embodiment, it should be specifically explained that the steps of obtaining the temperature data of the environment in which the cableway is located and calculating the temperature difference damage coefficient according to the temperature data are as follows:

[0092] Acquire temperature data of the environment in which the ropeway is located within a detection period, and the detection period may be nearly one week or nearly two weeks;

[0093] Calculate the maximum temperature difference of each day, which is the difference between the daily maximum temperature and the daily minimum temperature. Perform mean calculation on the maximum temperature difference of each day in the detection period to obtain an average temperature difference as a representative of the maximum temperature difference of the cableway in the operating environment during the detection period.

[0094] Obtain the material information of the ropeway cable, and obtain the fatigue coefficient and the exponential coefficient of temperature difference damage of the material by referring to the relevant material standards. The fatigue coefficient of the material is a parameter that measures the material's ability to resist fatigue damage under repeated loading or cyclic stress conditions. It describes the durability of the material when subjected to alternating stress for a long time, and reflects the relationship between the stress level and the number of times the material will suffer fatigue cracks or fail. Especially under conditions of high stress or repeated stress cycles, it is a key parameter for predicting the life and fatigue limit of the material; the exponential coefficient of temperature difference damage is a parameter that measures the sensitivity of the material to fatigue damage under temperature changes. It reflects the degree of damage to the material during the process of thermal expansion and contraction, and is usually related to the material's thermal expansion properties, thermal fatigue strength, and its performance in an alternating temperature environment. The temperature difference damage exponential coefficient is used to evaluate the durability of the material under high and low temperature cycles, and to help predict the service life and failure risk of the material under extreme temperature conditions;

[0095] The method for obtaining the temperature difference damage coefficient based on the average temperature difference value, the fatigue coefficient of the material and the exponential coefficient of temperature difference damage is as follows: Where DG represents the temperature difference damage coefficient, β represents the fatigue coefficient of the material, R represents the exponential coefficient of temperature difference damage, PT represents the average temperature difference value, and T0 represents the reference temperature, which is usually the standard temperature of the material at room temperature.

[0096] Step 7: Dynamically adjust the force safety threshold according to the adjustment factor to obtain the actual force safety threshold;

[0097] The adjustment factor of the force index calculated according to the environment in which the ropeway is located is a key parameter used to evaluate the load-bearing capacity of ropeway components under specific environmental conditions. This adjustment factor takes into account a variety of influencing factors, such as low air pressure and temperature changes in high-altitude areas, which may cause significant deviations between the actual force conditions of ropeway components and design standards. When the adjustment factor is too large, it indicates that the force conditions of the ropeway components may have exceeded the design expectations and there are certain safety hazards. This situation means that these components may have been overloaded and may even face the risk of damage or failure.

[0098] Therefore, based on this evaluation result, the threshold of the early warning system needs to be dynamically adjusted to more effectively reflect the actual operation status of the cableway. When environmental factors change or the load increases, the system should promptly lower the early warning threshold to detect potential dangers early.

[0099] In this embodiment, it should be specifically explained that the steps of dynamically adjusting the safety threshold of the force according to the adjustment factor to obtain the actual safety threshold of the force are:

[0100] An adjustment factor threshold is set, and the current adjustment factor is compared with the adjustment factor threshold. If the current adjustment factor is less than the adjustment factor threshold, it is determined that the deviation between the actual force condition of the cableway component and the force condition measured by the sensor is small, and the force safety threshold is not adjusted; if the current adjustment factor is greater than the adjustment factor threshold, it is determined that the deviation between the actual force condition of the cableway component and the force condition measured by the sensor is large, and the force safety threshold is adjusted to obtain the actual force safety threshold.

[0101] In this embodiment, it should be specifically explained that the actual force safety threshold calculation steps are:

[0102] Set an initial force safety threshold. When the current adjustment factor is greater than the adjustment factor threshold, calculate the ratio of the adjustment factor threshold to the current adjustment factor to obtain the deviation coefficient. The method is: Where dn represents the deviation coefficient, and AF′ represents the adjustment factor threshold;

[0103] The initial force safety threshold is multiplied by the deviation coefficient to obtain the actual force safety threshold.

[0104] Step 8: Provide early warning based on the actual cableway stress index and the actual stress safety threshold;

[0105] In this embodiment, it should be specifically explained that the step of providing an early warning reminder based on the actual cableway stress index and the actual stress safety threshold is:

[0106] The actual cableway stress index is compared with the actual stress safety threshold. If the actual cableway stress index is less than the actual stress safety threshold, it is determined that the current cableway state is good and no early warning reminder is issued; if the actual cableway stress index is greater than the actual stress safety threshold, it is determined that the current cableway load is large and accidents are prone to occur, then an early warning reminder is issued to remind the operator to take measures to avoid accidents and perform timely maintenance.

[0107] In this embodiment, it is necessary to specifically explain a force monitoring and early warning system for a circuitous cableway, the system comprising:

[0108] A cableway force data acquisition module is used to collect the cableway force data through sensors and transmit the cableway force data to the initial cableway force evaluation module;

[0109] The initial cableway force evaluation module is used to receive the cableway cable force data transmitted by the cableway force data acquisition module, and to comprehensively evaluate the force data to obtain an initial cableway force index, and to transmit the initial cableway force index to the cableway force adjustment module;

[0110] A cableway force adjustment module is used to receive the initial cableway force index transmitted by the initial cableway force evaluation module, collect the environmental information of the cableway, adjust the initial cableway force index according to the environmental information of the cableway, obtain the actual cableway force index, and transmit the actual cableway force index to the safety warning module;

[0111] A stress safety threshold adjustment module is used to adjust the stress safety threshold according to the environmental information of the ropeway, obtain the actual stress safety threshold, and transmit the actual stress safety threshold to the safety warning module;

[0112] The safety warning module is used to receive the actual cableway force index and the actual force safety threshold transmitted by the cableway force adjustment module and the force safety threshold adjustment module, and to issue a warning reminder based on the actual cableway force index and the actual force safety threshold.

[0113] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0114] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A force monitoring and early warning method for a circuitous cableway, characterized in that: The following steps are involved: Step 1: Select key parts from the cable as monitoring points, including the turning points, hanging sections and connection nodes of the cable, and set strain gauge sensors at the monitoring points; Step 2: The force data of each monitoring point is collected in real time by means of a strain gauge sensor, and the force unevenness is calculated according to the force data of each force monitoring point; Step 3: A tension sensor is set at the cable monitoring point, and the load data of each monitoring point is collected in real time through the tension sensor, and the cable overload degree is calculated according to the load data of each monitoring point; Step 4: A high-definition camera sensor is set at the cable monitoring point, and the image data of each monitoring point is collected in real time by the high-definition camera sensor. The degree of material damage is obtained by analyzing the image data of each monitoring point through image recognition technology; Step 5: The initial cableway stress index is calculated based on the comprehensive evaluation of stress unevenness, cable overload degree and material damage degree; Step 6: Collect environmental data of the environment where the ropeway is located, and obtain an adjustment factor based on the environmental data evaluation, and calculate the actual ropeway force index by multiplying the initial ropeway force index by the adjustment factor; Step 7: Dynamically adjust the force safety threshold according to the adjustment factor to obtain the actual force safety threshold; Step 8: Issue early warning reminders based on the actual cableway stress index and the actual stress safety threshold.

2. A method for monitoring and early warning of force for a circuitous ropeway according to claim 1, characterized in that: The step of calculating the force unevenness according to the force data of each force monitoring point is: During the operation of the cableway, the strain data of each monitoring point in the cable is collected in real time; The elastic modulus of the cable material and the cross-sectional area of ​​the cable at the monitoring point are obtained from the cable factory manual, and the strain data, elastic modulus and cross-sectional area of ​​the cable are multiplied to obtain the force at the monitoring point; Calculate the average force of all monitoring points; The method for obtaining the force unevenness based on the force at each monitoring point and the average force at all monitoring points is: UF is the force unevenness. represents the absolute difference between the force at the ith monitoring point and the average force, F i It is represented as the force on the ith monitoring point, It is expressed as the average force of all monitoring points.

3. A method for monitoring and warning the force of a circuitous ropeway according to claim 1, characterized in that: The step of calculating the cable overload degree according to the load data of each monitoring point is as follows: The load at each monitoring point is measured in real time by a tension sensor, and the maximum design load at each monitoring point is obtained based on the data provided by the cable manufacturer; The overload degree of each monitoring point is obtained by calculating the ratio of the load of each monitoring point to the maximum design load of the monitoring point; The overload degree of each monitoring point is averaged and the overload degree of the cable is obtained.

4. A method for monitoring and early warning of force for a circuitous ropeway according to claim 1, characterized in that: The steps of analyzing the image data of each monitoring point by image recognition technology to obtain the degree of material damage are: Preprocessing the image data of each monitoring point collected by the high-definition camera sensor, wherein the preprocessing includes noise processing, contrast enhancement, and edge enhancement; Using image recognition technology to extract key damage features, the damage features include crack length, crack width and number of broken wires, the crack length is the sum of the lengths of all cracks in the image, and the crack width is the sum of the widths of all cracks in the image; The crack length, crack width and number of broken wires are normalized, and the normalized crack length, crack width and number of broken wires are comprehensively evaluated through nonlinear combination to obtain the degree of material damage.

5. The method for monitoring and early warning of force for a circuitous ropeway according to claim 1, characterized in that: The steps of collecting the environmental data of the environment in which the ropeway is located and obtaining the adjustment factor based on the environmental data are as follows: The altitude of the environment where the ropeway is located is obtained, the air density is calculated according to the altitude, the ultraviolet intensity of the environment where the ropeway is located is measured by ultraviolet detection equipment, and the coating aging coefficient is obtained according to the air density and ultraviolet intensity. Where CA is the coating aging coefficient, α is the proportionality coefficient, representing the basic aging rate of the coating, and the proportionality coefficient is obtained from the coating manufacturer. UV (h) is the ultraviolet intensity, ρ is the air density; Obtain the temperature data of the environment where the cableway is located, and calculate the temperature difference damage coefficient based on the temperature data; The method to obtain the adjustment factor according to the coating aging coefficient and the temperature difference damage coefficient is AF=a1×CA+a2×DG, where AF is represented as the adjustment factor, cA is represented as the coating aging coefficient, DG is represented as the temperature difference damage coefficient, and a1 and a2 are represented as the weight coefficients of the coating aging coefficient and the temperature difference damage coefficient.

6. A method for monitoring and warning the force of a circuitous ropeway according to claim 5, characterized in that: The steps of obtaining the temperature data of the environment in which the cableway is located and calculating the temperature difference damage coefficient according to the temperature data are as follows: Obtain temperature data of the environment where the ropeway is located during the detection period; Calculate the maximum temperature difference for each purpose, the daily maximum temperature difference is the difference between the daily maximum temperature and the daily minimum temperature, and average the daily maximum temperature difference within the detection time period to obtain an average temperature difference; Obtain the fatigue coefficient of the cable material and the exponential coefficient of temperature difference damage by referring to relevant material standards; The method for obtaining the temperature difference damage coefficient based on the average temperature difference value, the fatigue coefficient of the material and the exponential coefficient of temperature difference damage is as follows: Where DG represents the temperature difference damage coefficient, β represents the fatigue coefficient of the material, R represents the exponential coefficient of temperature difference damage, PT represents the average temperature difference value, and T0 represents the reference temperature.

7. The method for monitoring and early warning of force for a circuitous ropeway according to claim 1, characterized in that: The steps of dynamically adjusting the use force safety threshold according to the adjustment factor to obtain the actual use force safety threshold are: An adjustment factor threshold is set, and the current adjustment factor is compared with the adjustment factor threshold. If the current adjustment factor is less than the adjustment factor threshold, it is determined that the deviation between the actual force condition of the cableway component and the force condition measured by the sensor is small, and the force safety threshold is not adjusted; if the current adjustment factor is greater than the adjustment factor threshold, it is determined that the deviation between the actual force condition of the cableway component and the force condition measured by the sensor is large, and the force safety threshold is adjusted to obtain the actual force safety threshold.

8. A method for monitoring and warning the force of a circuitous ropeway according to claim 7, characterized in that: The actual calculation steps of the force safety threshold are as follows: An initial force safety threshold is set. When the current adjustment factor is greater than the adjustment factor threshold, the adjustment factor threshold is calculated by ratio with the current adjustment factor to obtain the deviation coefficient. The initial force safety threshold is multiplied by the deviation coefficient to obtain the actual force safety threshold.

9. The method for monitoring and early warning of force for a circuitous ropeway according to claim 1, characterized in that: The steps of providing early warning and reminder according to the actual cableway stress index and the actual stress safety threshold are as follows: The actual cableway stress index is compared with the actual stress safety threshold. If the actual cableway stress index is less than the actual stress safety threshold, it is determined that the current cableway state is good, and no warning reminder is issued; If the actual cableway stress index is greater than the actual stress safety threshold, it is determined that the current cableway load is large and an accident is prone to occur, and an early warning reminder is issued.

10. A force monitoring and early warning system for a circuitous cableway, characterized in that: The system comprises: A cableway force data acquisition module is used to collect the cableway force data through sensors and transmit the cableway force data to the initial cableway force evaluation module; The initial cableway force evaluation module is used to receive the cableway cable force data transmitted by the cableway force data acquisition module, and to comprehensively evaluate the force data to obtain an initial cableway force index, and to transmit the initial cableway force index to the cableway force adjustment module; A cableway force adjustment module is used to receive the initial cableway force index transmitted by the initial cableway force evaluation module, collect the environmental information of the cableway, adjust the initial cableway force index according to the environmental information of the cableway, obtain the actual cableway force index, and transmit the actual cableway force index to the safety warning module; A stress safety threshold adjustment module is used to adjust the stress safety threshold according to the environmental information of the ropeway, obtain the actual stress safety threshold, and transmit the actual stress safety threshold to the safety warning module; The safety warning module is used to receive the actual cableway force index and the actual force safety threshold transmitted by the cableway force adjustment module and the force safety threshold adjustment module, and to issue a warning reminder based on the actual cableway force index and the actual force safety threshold.

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