A monitoring method of ice thickness based on interface temperature

A technology of ice coating thickness and surface temperature, applied in measurement devices, instruments, etc., can solve problems such as poor adaptability and complex sensor structure, and achieve the effect of simple data analysis method and long-term online monitoring.

Inactive Publication Date: 2020-05-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resistance or capacitance method sensor has a slightly complicated structure, etc.
To sum up, the existing icing monitoring methods have certain limitations, and the adaptability is not strong.

Method used

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  • A monitoring method of ice thickness based on interface temperature
  • A monitoring method of ice thickness based on interface temperature
  • A monitoring method of ice thickness based on interface temperature

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0031] Icing on the surface of objects in nature is usually divided into two types: transparent ice and frost ice. Both types of ice are formed when supercooled water droplets impinge and attach to the surface of structures. In general, the temperature of the supercooled water droplets from the air is not consistent with the surface temperature of the structure, so when the supercooled water droplets hit the surface of the structure and form ice, it will involve complex energy conversion, heat exchange and heat balance processes, and then Affects the temperature of the surface of the structure. The energy conversion process, heat exchange process and influence on temperature mainly involved are as follows:

[0032] First, the supercooled water droplet attaches to the surface of the structure for the first time, heat conduction occurs immediately between the supercooled water droplet and the surface of the structure, and the temperature of the surface of the structure changes ...

specific Embodiment approach 2

[0062] When there is no ice on the surface of the structure, the measured temperature curve is the surface temperature of the structure, which is basically consistent with the ambient temperature. When weather phenomena such as freezing rain occur, supercooled water hits and adheres to the surface of the structure, which will cause the temperature to rise in a short time. exist image 3 The test shown (the surface icing test of FRP material) simulates the icing process in a cryogenic laboratory using a supercooled water spray method. When icing starts, the temperature rises rapidly and then falls slowly, with -1 degree Celsius as the threshold, the characteristic duration Δt is obtained 1 Used to estimate ice coverage. Further, the spraying time is longer, and the amount of ice is more, and the characteristic duration Δt is obtained 2 and Δt 3 . In the experiment, because the thickness of the ice coating is uniform, take out a small piece of ice and use a vernier caliper ...

specific Embodiment approach 3

[0066] Same as the test in the second embodiment, the influence of the ambient temperature on the characteristic duration is given in this embodiment, such as Figure 5 shown. Curve 8 in the figure corresponds to an ambient temperature of minus 8 degrees Celsius, and curve 9 corresponds to an ambient temperature of minus 5 degrees Celsius. It can be seen from the figure that the ambient temperature has little influence on the characteristic duration.

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Abstract

The invention discloses a monitoring method for an icing thickness based on an interface temperature, and relates to the technical field of structure monitoring and nondestructive testing. The invention aims to meet monitoring requirements of icing thickness and time of various structure body surfaces. The monitoring method for the icing thickness based on the interface temperature comprises the following steps of: acquiring a surface temperature of a monitored structure body in real time; drawing the obtained surface temperature as a temperature profile over time; extracting a feature duration in the temperature profile; establishing a mapping relationship between the feature duration and the icing thickness; and obtaining the icing thickness at any moment in the feature duration according to the mapping relation. According to the monitoring method for the icing thickness based on the interface temperature, long-term online monitoring of surface icing of the structure can be realized,and accurate icing information can be provided for deicing actions in time.

Description

technical field [0001] The invention belongs to the technical field of structure monitoring and non-destructive testing, in particular to the monitoring of ice coating on the surface of a structure. Background technique [0002] Under freezing weather conditions, the surface of engineering structures will freeze. Ice coating on the surface of various engineering structures may cause serious hazards. For example, ice coating on transmission lines may cause line flashover and tripping in mild cases, and cause accidents such as disconnection and tower collapse in severe cases; The safety of people’s lives and property poses a serious threat; the icing of the cable-stayed cables on the cable-stayed bridge will change the cross-sectional shape of the cable-stayed cables, form an unstable aerodynamic shape, cause various types of wind-induced vibration, and seriously affect the cable-stayed cables and bridge structure At the same time, the ice-coated fall of the cable-stayed cabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/08
CPCG01B21/085
Inventor 周文松李惠张照辉
Owner HARBIN INST OF TECH
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