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Piezoelectric impedance principle-based icing monitoring device and method

A piezoelectric impedance and monitoring device technology, which is applied in the research fields of structural monitoring and non-destructive testing, can solve the limitations of ice monitoring methods and other problems, and achieve the effect of low price, simple installation method and good durability

Inactive Publication Date: 2019-01-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the problem of limitations of existing ice-covering monitoring methods, and now provides an ice-covering monitoring device and method based on the principle of piezoelectric impedance

Method used

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  • Piezoelectric impedance principle-based icing monitoring device and method
  • Piezoelectric impedance principle-based icing monitoring device and method
  • Piezoelectric impedance principle-based icing monitoring device and method

Examples

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specific Embodiment approach 1

[0027] Specific embodiment 1: The ice coating monitoring device based on the principle of piezoelectric impedance described in this embodiment is specifically, as figure 1 As shown, among them: structural body 1, square piezoelectric ceramic sensor 2, two-core shielded signal line 3, impedance analyzer 4, and PC 5.

[0028] Due to the positive and negative piezoelectric effect of the piezoelectric sensor, the piezoelectric sensor has the characteristics of electromechanical coupling. Therefore, the collecting end of the square piezoelectric ceramic sensor 2 is pasted (coupling agent or butter can be used for pasting) on ​​the surface of the structure 1 and forms an electromechanical coupling system with the structure 1. There is a quantitative relationship between the mechanical impedance of the system and the electrical impedance of the piezoelectric sensor. The square piezoelectric ceramic sensor 2 is used to collect electrical impedance signals. By measuring the electrical imp...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment is based on the ice coating monitoring method implemented by the ice coating monitoring device described in Embodiment 1, and the details are as follows:

[0030] In the uniced state of the structure, the impedance analyzer can be used to measure the electrical impedance versus frequency curve of a group of piezoelectric sensors as a reference curve. Specifically, when there is no ice coating on the surface of the structure 1, the impedance analyzer 4 is used for measurement to obtain a reference curve without ice coating.

[0031] When the surface of the structure begins to be covered with ice, the mechanical impedance of the system composed of the structure, ice and piezoelectric sensor will change. At this time, the impedance analyzer is used to measure the electrical impedance curve in the current state, and the curve is compared with With reference to the difference analysis of the curve, it can be judged that the surface of the structure h...

specific Embodiment approach 3

[0033] Specific implementation manner 3: The ice coating monitoring device based on the principle of piezoelectric impedance described in this implementation manner, specifically, such as figure 2 As shown, among them: stay cable polyethylene sheath 6, circular piezoelectric ceramic sensor 7 (diameter 12mm, thickness 1mm), two-core shielded signal line 8, impedance analyzer 9, PC machine 10.

[0034] The collecting end of the circular piezoelectric ceramic sensor 7 is glued on the surface of the cable polyethylene sheath 6 with epoxy resin, and forms an electromechanical coupling system with the cable polyethylene sheath 6. The circular piezoelectric ceramic sensor 7 Used to collect electrical impedance signals, the electrical impedance signal output end of the circular piezoelectric ceramic sensor 7 is connected to the electrical impedance signal input end of the impedance analyzer 9 through a two-core shielded signal line 8. The impedance analyzer 9 is used to obtain the electri...

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Abstract

The invention discloses a piezoelectric impedance principle-based icing monitoring device and method, relates to the research field of structure monitoring and nondestructive test, and aims at solvingthe problem that existing icing monitoring methods have boundedness. According to the piezoelectric impedance principle-based icing monitoring device and method provided by the invention, a thin andlight piezoelectric sensor is adhered on the surface of a tested structure, an impedance curve of the piezoelectric sensor is obtained through measurement, and change features of the impedance curve is analyzed, so that accurate online measurement for an icing starting time and an icing amount of ice on the surface of the tested structure is realized.

Description

Technical field [0001] The invention belongs to the research field of structure monitoring and non-destructive testing, and particularly relates to the detection and monitoring of ice coating on solid surfaces. Background technique [0002] Under freezing weather conditions, icing will occur on the surface of engineering structures. The icing on the surface of various engineering structures may cause serious hazards. For example, icing on transmission lines may cause line flashovers and trips, and in severe cases, it may cause line disconnection and tower collapse; icing on highway roads will affect driving safety and harm the people. Life and property safety poses a serious threat; the icing of stayed cables on cable-stayed bridges will change the cross-sectional shape of stayed cables, forming unstable aerodynamic shapes, triggering various types of wind-induced vibrations, and seriously affecting the staying cables and the bridge structure itself. Safety, icing and falling of...

Claims

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Application Information

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IPC IPC(8): G01N27/02G01B7/06
CPCG01B7/063G01N27/02
Inventor 周文松李惠张鑫
Owner HARBIN INST OF TECH