A method and system for monitoring and warning of the risk of ice falling on stay cables

Abstract

The present invention discloses a method and system for monitoring and warning of the risk of ice falling on stay cables, including the steps of: calculating the area undetermined coefficient through indoor simulation experiments; calculating the ice layer capacitance value and measuring the maximum average wind speed and average temperature in the environment; calculating the warning coefficient according to the area undetermined coefficient, the ice layer capacitance value, the maximum average wind speed and the average temperature; and judging whether there is a risk of ice falling on the stay cable according to the magnitude of the warning coefficient. The method disclosed by the present invention can timely monitor the magnitude of the risk of ice falling on the stay cable, remind relevant personnel to take deicing measures when there is a large risk of ice falling, reduce the waste of equipment and human resources caused by blind deicing, and reduce the cost.

Description

Technical Field

[0001] The present invention relates to the field of ice-falling risk monitoring, and particularly to a method and system for monitoring and warning of ice-falling risk of stay cables. Background Art

[0002] Most regions in China have a frozen climate environment, and there are many structural problems in the cable-stayed bridges in these regions, resulting in ice formation on most stay cables. The ice layer covering the stay cables gradually falls off when the weather warms up, posing safety problems to the vehicles and pedestrians passing on the bridge deck.

[0003] Currently, some existing technologies focus on de-icing stay cables, such as using mobile de-icing robots or attaching fixed de-icing devices to stay cables. However, when the weather conditions are unknown, blind de-icing lacks practicality, requires a lot of labor and has low efficiency. In addition, if it continues to be an ice-prone weather after de-icing, the ice formation condition has not improved. In fact, ice-falling of stay cables only occurs under certain specific circumstances, and taking artificial intervention measures when the predicted ice-falling risk is high is a more economical and effective method.

[0004] Therefore, there is an urgent need to propose a method for monitoring and warning of the ice-falling risk of stay cables to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for monitoring and warning of ice-falling risk of stay cables, which can monitor the ice-falling risk and issue a warning.

[0006] The present invention discloses a method for monitoring and warning of ice-falling risk of stay cables, and the method includes the following steps:

[0007] S1. Calculate the region-specific coefficient through indoor simulation experiments;

[0008] S2. Calculate the ice layer capacitance value and measure the maximum average wind speed and average temperature on the stay cable;

[0009] S3. Calculate the warning coefficient according to the region-specific coefficient, the ice layer capacitance value, the maximum average wind speed and the average temperature;

[0010] S4. Judge whether there is an ice-falling risk of the stay cable according to the magnitude of the warning coefficient.

[0011] Further, the warning coefficient calculation method is as follows:

[0012] Y = a * H + b * W + c * T;

[0013] Wherein, a, b and c are the region-specific coefficients; H is the ice layer capacitance value; W is the maximum average wind speed; T is the average temperature; and Y is the warning coefficient.

[0014] Further, when judging the risk of ice falling on the stay cable, when the warning coefficient is less than or equal to 1, it indicates that there is no risk of ice falling; when the warning coefficient is greater than or equal to 2, a warning message of ice falling risk is issued.

[0015] Further, in the indoor simulation experiment, the ice layer capacitance value, the maximum average wind speed, and the average air temperature are tested, and the value of the warning coefficient is determined according to different ice layer states. Finally, the undetermined coefficient of the area is calculated according to the calculation formula of the warning coefficient.

[0016] Further, the capacitor plates installed on the stay cable are connected to the signal acquisition box through signal lines. The ice layer thickness on the stay cable and the ice layer thickness distribution at different positions are obtained by the capacitance test circuit in the signal acquisition box, so as to calculate the ice layer capacitance value.

[0017] Further, the average wind speed within a predetermined time is monitored to obtain the maximum average wind speed.

[0018] On the other hand, the present invention also proposes a monitoring and warning system for the risk of ice falling on a stay cable, including a capacitance element, a wind force monitoring element, a temperature monitoring element, a transmission antenna, and a signal acquisition box;

[0019] The capacitance element is installed on the stay cable and is used to monitor the ice layer thickness and the ice layer thickness distribution on the stay cable;

[0020] The wind force detection element is used to monitor the wind speed of the stay cable environment;

[0021] The temperature monitoring element is used to monitor the temperature of the stay cable environment;

[0022] The capacitance element, the wind force detection element, the transmission antenna, and the temperature monitoring element are all connected to the signal acquisition box through signal lines. The signal acquisition box transmits the monitored temperature, wind speed, ice layer thickness, and ice layer thickness distribution information through the transmission antenna.

[0023] Further, the wind force detection element is an anemometer, and the temperature monitoring element is a temperature measurement sensor.

[0024] Further, the capacitance element includes a first capacitance element and a second capacitance element. Both the first capacitance element and the second capacitance element are in the shape of a circular ring sheet, are arranged around the surface of the stay cable, and maintain a predetermined distance.

[0025] Further, the capacitance element further includes interdigital electrodes in a finger-like or comb-like structure; the interdigital electrodes of the first capacitance element and the interdigital electrodes of the second capacitance element are arranged in an interpenetrating manner and are evenly distributed around the surface of the stay cable.

[0026] Compared with the prior art, the present invention has at least the following advantages:

[0027] The present invention calculates the warning coefficient by collecting the area undetermined coefficient, the ice layer capacitance value of the cable, the maximum average wind speed in the area and the average temperature in the area, and judges whether there is a risk of ice falling on the cable according to the size of the warning coefficient, monitors the size of the risk of ice falling on the cable in a timely manner, and reminds relevant personnel to take deicing measures when there is a greater risk of ice falling, reducing the waste of equipment and human resources caused by blind deicing and lowering the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural block diagram of the method for monitoring and warning the risk of ice falling on the cable in the first embodiment of the present invention;

[0029] Figure 2 It is a connection relationship diagram of the device for monitoring and warning the risk of ice falling on the cable in the first embodiment of the present invention;

[0030] Figure 3 It is a positional relationship diagram of the capacitive element and the cable in the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following will describe in more detail a method and system for monitoring and warning the risk of ice falling on a cable of the present invention with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present invention.

[0032] In the following paragraphs, the present invention will be described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present invention will be clearer according to the following description and the claims. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0033] Embodiment 1

[0034] This embodiment provides a method for monitoring and warning the risk of ice falling on a cable. Please refer to Figure 1 , and the method includes the following steps:

[0035] S1. Calculate the area undetermined coefficient through indoor simulation experiments;

[0036] S2. Calculate the ice layer capacitance value and measure the maximum average wind speed and average temperature in the environment;

[0037] S3. Calculate the warning coefficient according to the area undetermined coefficient, the ice layer capacitance value, the maximum average wind speed and the average temperature;

[0038] S4. Determine whether there is a risk of ice falling from the cable according to the magnitude of the warning coefficient.

[0039] Specifically, in S1, test the ice layer capacitance value, the maximum average wind speed, and the average temperature, and determine the value of the warning coefficient according to different ice layer states, so as to obtain the undetermined coefficient of the area. That is, based on the climate environment and cable structure of a certain area, the above-mentioned simulation test is completed. The simulation test time is generally 5 minutes. After obtaining the undetermined coefficient of the area, when monitoring the ice falling risk of the cable subsequently, the warning coefficient can be directly calculated according to the undetermined coefficient of the area and the collected ice layer capacitance value, maximum average wind speed, and average temperature.

[0040] Further, in S2, please refer to Figure 2 , the capacitor plate, the wind monitoring element, and the temperature monitoring element are connected to the signal acquisition box through signal lines, and the ice layer thickness on the cable and the ice layer thickness distribution at different positions are obtained by the capacitance test circuit in the signal acquisition box. A 4G signal transmission antenna is arranged in the signal acquisition box to transmit the collected information such as temperature, wind force, ice layer thickness, and ice layer thickness distribution.

[0041] In addition, in S3, the following calculation formula is adopted to calculate the warning coefficient:

[0042] Y = a*H + b*W + c*T;

[0043] Among them, a, b, and c are the undetermined coefficients of the area; H is the ice layer capacitance value, which is indirectly related to the average ice layer thickness. When the thickness of the ice layer between the capacitor plates increases, the capacitance value will also increase accordingly; W is the maximum average wind speed; T is the average temperature; Y is the warning coefficient. That is, after collecting the ice layer capacitance value, the maximum average wind speed, the average temperature, and the undetermined coefficient of the area obtained from the indoor simulation experiment, the warning coefficient can be calculated.

[0044] Among them, calculate the average wind speed every 5 minutes within 3 hours from the monitoring moment, and compare each average wind speed to obtain the maximum average wind speed W.

[0045] Preferably, in S4, when the warning coefficient is equal to 0, it means that the ice layer is stable; when the warning coefficient is equal to 1, it means that the ice layer falls under strong vibration; when the warning coefficient is equal to 2, it means that the ice layer falls under slight vibration; when the warning coefficient is equal to 3, it means that the ice layer falls under no vibration condition. In actual warning, when the warning coefficient is greater than or equal to 2, there is a risk of ice falling and intervention measures need to be taken. When the warning coefficient is less than or equal to 1, it means that there is no risk of ice falling and no intervention measures are required.

[0046] In this embodiment, the warning coefficient is calculated by collecting the undetermined coefficient of the region, the ice layer capacitance value of the cable, the maximum average wind speed of the region, and the average temperature of the region, and it is judged whether there is a risk of ice falling on the cable according to the magnitude of the warning coefficient, so as to monitor the magnitude of the ice falling risk of the cable in a timely manner. When the ice falling risk is relatively large, relevant personnel are reminded to take de-icing measures, reducing the waste of equipment and human resources caused by blind de-icing and lowering the cost.

[0047] Embodiment 2

[0048] The capacitance element is installed on the cable to monitor the ice layer thickness and the ice layer thickness distribution on the cable;

[0049] The wind force detection element is used to monitor the wind speed of the cable environment;

[0050] The temperature monitoring element is used to monitor the temperature of the cable environment;

[0051] The capacitance element, the wind force detection element, the transmission antenna and the temperature monitoring element are all connected to the signal acquisition box through signal lines, and the signal acquisition box transmits the monitored temperature, wind speed, ice layer thickness and ice layer thickness distribution information through the transmission antenna.

[0052] Specifically, the wind force detection element is an anemometer, the temperature monitoring element is a temperature measuring sensor, and the anemometer and the temperature measuring sensor transmit the collected wind force and temperature data to the signal acquisition box in the form of electrical signals.

[0053] In this embodiment, relevant information such as wind speed, temperature, ice layer thickness and ice layer thickness distribution can be collected through the capacitance element, the wind force detection element and the temperature detection element. The acquisition system has a simple structure and low acquisition cost.

[0054] In a specific embodiment, the temperature monitoring element and the wind force monitoring element are installed at the end of the cable, and the air temperature and wind speed at the top or a suitable position of the cable are measured through the temperature monitoring element and the wind force monitoring element.

[0055] Further, please refer to Figure 3 , the capacitance element includes a first capacitance element 1 and a second capacitance element 2, and both the first capacitance element 1 and the second capacitance element 2 are arranged around the surface of the cable. In addition, the capacitance element further includes interdigital electrodes in a finger-like or comb-like structure; the interdigital electrodes of the first capacitance element 1 and the interdigital electrodes of the second capacitance element 2 are arranged in an interpenetrating manner and are evenly distributed around the surface of the cable.

[0056] Specifically, the height of the capacitor plate exceeds the conventional freezing thickness of the region. After ice and snow cover the capacitor plate and form an ice layer, the detection circuit in the signal acquisition box connected to the capacitor plate through the signal line can obtain the ice layer thickness and the ice layer thickness distribution information on the cable.

[0057] In summary, in this embodiment, the warning coefficient is calculated by collecting the undetermined coefficient of the region, the ice layer capacitance value of the cable, the maximum average wind speed of the region, and the average temperature of the region, and it is judged whether there is a risk of ice falling on the cable according to the size of the warning coefficient, so as to monitor the size of the ice falling risk on the cable in a timely manner. When the ice falling risk is relatively large, relevant personnel are reminded to take de-icing measures, which reduces the waste of equipment and human resources caused by blind de-icing and lowers the cost.

[0058] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A method for monitoring and warning of the risk of ice falling on stay cables, characterized in that, the method comprises the following steps: S1. Calculate the area undetermined coefficient through indoor simulation experiments; S2. Calculate the ice layer capacitance value and measure the maximum average wind speed and average temperature on the stay cable; S3. Calculate the warning coefficient according to the area undetermined coefficient, the ice layer capacitance value, the maximum average wind speed and the average temperature; S4. Judge whether there is a risk of ice falling on the stay cable according to the magnitude of the warning coefficient; wherein, the calculation method of the warning coefficient is as follows: Y = a*H + b*W + c*T; wherein, a, b and c are the area undetermined coefficients; H is the ice layer capacitance value; W is the maximum average wind speed; T is the average temperature; Y is the warning coefficient; When judging the risk of ice falling on the stay cable, when the warning coefficient is less than or equal to 1, it indicates that there is no risk of ice falling; when the warning coefficient is greater than or equal to 2, a warning message of the risk of ice falling is issued; In the indoor simulation experiment, measure the ice layer capacitance value, the maximum average wind speed and the average temperature, determine the value of the warning coefficient according to different ice layer states, and finally calculate the area undetermined coefficient according to the calculation formula of the warning coefficient.

2. The method for monitoring and warning of the risk of ice falling on the stay cable according to claim 1, characterized in that, The capacitor plates installed on the stay cable are connected to the signal acquisition box through signal lines, and the ice layer thickness and the ice layer thickness distribution at different positions on the stay cable are obtained by the capacitance test circuit in the signal acquisition box, and the ice layer capacitance value is calculated.

3. The method for monitoring and warning of the risk of ice falling on the stay cable according to claim 1, characterized in that, Monitor the average wind speed within a predetermined time to obtain the maximum average wind speed.

4. A system for monitoring and warning of the risk of ice falling on the stay cable, characterized in that, used to implement the method for monitoring and warning of the risk of ice falling on the stay cable according to any one of claims 1 to 3, including a capacitance element, a wind force monitoring element, a temperature monitoring element, a transmission antenna and a signal acquisition box; The capacitance element is installed on the stay cable and is used to monitor the ice layer thickness and the ice layer thickness distribution on the stay cable; the wind force monitoring element is used to monitor the wind speed of the stay cable environment; The temperature monitoring element is used to monitor the temperature of the stay cable environment; The capacitance element, the wind force monitoring element, the transmission antenna and the temperature monitoring element are all connected to the signal acquisition box through signal lines, and the signal acquisition box transmits the monitored temperature, wind speed, ice layer thickness and ice layer thickness distribution information through the transmission antenna.

5. The system for monitoring and warning of the risk of ice falling on the stay cable according to claim 4, characterized in that, The wind force monitoring element is an anemometer, and the temperature monitoring element is a temperature measuring sensor.

6. The system for monitoring and warning of the risk of ice falling on the stay cable according to claim 4, characterized in that, The capacitance element includes a first capacitance element and a second capacitance element, and both the first capacitance element and the second capacitance element are in the shape of a circular ring sheet, are arranged around the surface of the stay cable, and maintain a predetermined distance.

7. The system for monitoring and warning of the risk of ice falling on the stay cable according to claim 6, characterized in that, The capacitive element further includes interdigital electrodes in a finger-like or comb-like structure; the interdigital electrodes of the first capacitive element and the interdigital electrodes of the second capacitive element are arranged to interpenetrate each other and are evenly distributed around the surface of the cable.

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