Intelligent electromechanical impedance sensor used for structure health status monitoring

Abstract

The invention provides an intelligent electromechanical impedance sensor used for structure health status monitoring, belonging to the structure health monitoring field, relating to a sensor monitoring a structure health status based on an electromechanical impedance method. The sensor is composed of a power supply management module, a microprocessor module, a wireless communication module, an electromechanical impedance sensing module, a multi-channel change over switch and a piezoelectric patch connection terminal. The sensor can detect mechanical impedance change caused by structure health status change and convert the mechanical impedance change into electrical impedance which is easy to measure. The sensor has the advantages of small volume, wireless communication and convenience of installation on an on-site structure. Through measurement of electromechanical impedance which is coupled of the mechanical impedance and the electrical impedance, necessary information is provided for structure health status monitoring and structure failure prediction based on the electromechanical impedance method.

Description

technical field [0001] An intelligent electromechanical impedance sensor for structural health monitoring belongs to the field of structural health monitoring, and specifically relates to a sensor for monitoring structural health based on an electromechanical impedance method. Background technique [0002] With the continuous development of science and technology and industry, people pay more and more attention to the safety of various building structures and mechanical engineering structures within their service life. During the long-term service of engineering structures, the coupling of disaster factors such as environmental erosion, material aging and load effects, man-made or natural mutation effects will inevitably lead to the accumulation of structural damage and attenuation of resistance, so as to resist natural disasters, The ability to normal load and environmental action is reduced, causing catastrophic accidents. It is necessary to regularly monitor the safety o...

AI Technical Summary

Problems solved by technology

However, when this small impedance sensor is working, a single sensor can only measure one piezoelectric sheet. However, in practical applications, it is often necessary to arrange multiple piezoelectric sheets in a local area of ​​the structure for monitoring. If this sensor is used, it will be necessary Multiple sensors are installed in a local small area, which is high cost and inconvenient to install for practical applications

In addition, the wireless communication frequency band of the sensor is 2.4GHz. During the wireless communication process, the communication signal penetration ability of this frequency band is weak, and it is easily blocked by walls and buildings, and the communication distance is limited.

Furthermore, the main control part of the sensor uses a traditional 8-bit processor, compared with a 32-bit processor, the calculation speed is slower and the power consumption is higher.

Seunghee Park of Sungkyunkwan University in South Korea has also developed a similar small sensor. Although a multi-channel piezoelectric sheet switching path has been added, the microprocessor and communication part of the main control part also have the same problems as Gyuhae Park.

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