A kind of dynamic data measurement method and device based on vibrating wire sensor

Abstract

The invention discloses a dynamic data measurement method and device based on a vibrating wire sensor, and belongs to the technical field of the health monitoring of a large-scale structural body. Themethod comprises the following steps: enabling the vibrating wire sensor to be fixed on a measurement point of a to-be-measured structural body; carrying out the excitation through a phase compensation adaptive frequency excitation method, and enabling a string wire to be stably resonant at an inherent frequency; collecting an electromotive force signal generated during the vibration of the steelwire and the temperature; carrying out the processing of a resonant signal through employing a windowing FFT algorithm based on amplitude ratio interpolation, and estimating the frequency of the signal component with the maximum amplitude in the collected signal as the real-time resonant frequency of the steel wire; carrying out the temperature compensation according to the real-time resonant frequency of the steel wire and the obtained current temperature of the steel wire, obtaining a real-time strain Epsilon of the steel wire, and obtaining the real-time strain Epsilon(s) of the to-be-measured structural body. The invention also discloses a dynamic data measurement device based on the vibrating wire sensor, and the device can implement the above method. The method and device are shortin measurement period, and are high in precision.

Description

technical field [0001] The invention relates to a dynamic data measurement method and device based on a vibrating wire sensor, belonging to the technical field of large-scale structure health monitoring. Background technique [0002] With the rapid development of economy and science and technology, more and more large-scale and complex engineering structures have been built, such as long-span bridges, large-scale water conservancy projects, high-rise buildings, ocean platforms, etc. These engineering structures are very important to protect people's lives and property safety is of great significance. During the service period of decades or even hundreds of years, the long-term effects of the environment and loads, and the sudden occurrence of natural disasters will have an inevitable impact on the structure, resulting in the accumulation of damage, and may even cause catastrophic accidents in extreme cases . In order to ensure the safe use of large structures, it is necess...

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Problems solved by technology

[0004] In order to solve the problems of too long measurement period, inaccurate measurement and unsuitability for dynamic measurement in the existing strain measurement technology for large-scale structures, this invention proposes a dynamic data measurement method and device based on vibrating wire sensor to solve the technology The problem is to realize the dynamic measurement of the strain of the structure, which has the advantages of short measurement period and high precision

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