Magnetic flux cable force detecting device based on MEMS (Micro Electro Mechanical System) acceleration sensor correction

Abstract

The invention relates to a magnetic flux cable force detecting device based on MEMS (Micro Electro Mechanical System) acceleration sensor correction. The device comprises an MEMS acceleration sensor, an excitation coil, an induction coil, an anti-alias filter, a microcontroller, a data display module and the like. After the anti-alias filter filters aliasing signal from vibration signals generated by external excitation borne by a bridge cable, an analog-digital converter converts the vibration signals into digital signals, the microcontroller performs FFT (Fast Fourier Transform) operation, and the MEMS acceleration sensor finally obtains a feature frequency value of bridge cable vibration. Aiming at the problems that field calibration is needed due to data drift caused by ageing of internal electronic components, the use cost is high and the data processing difficulty is high in the present bridge cable force detecting device based on magnetic flux detection, the aim of the invention is to provide a magnetic flux cable force detecting device with the characteristics of simple structure and convenience in manufacturing and use. The magnetic flux cable force detecting device can solve the maximum problem of time drift of the present magnetic flux cable force detecting device by arranging one MEMS acceleration sensor inside the magnetic flux sensor, reduce the monitoring cost and improve the validity and the reliability of the monitored data.

Description

technical field [0001] The invention belongs to the field of civil engineering structure safety detection equipment, in particular to a magnetic flux cable force detection device based on MEMS acceleration sensor correction. Background technique [0002] The cable force of bridge cables directly determines the working state of cable-stayed bridges, suspension bridges, arch bridges and other cable-stayed bridges. The change of cable force is an important indicator to measure whether the cable structure of a zipper system bridge is in a normal operating state. Therefore, using an accurate method to detect the bridge cable force is a necessary means to ensure the smooth construction and safe operation of the bridge. [0003] At present, the detection of domestic bridge cable force usually adopts the following methods: oil pressure gauge method, pressure sensor measurement, vibration method (frequency method) and so on. However, due to the oil pressure gauge method, there are d...

AI Technical Summary

Problems solved by technology

However, the magnetic flux measured by the current bridge cable force detection device based on magnetic flux detection is a static absolute voltage value, which will cause data drift over time due to the aging of the magnetic flux sensor's internal coil and other electronic components

This will lead to the need to re-calibrate the bridge cable force detection device based on magnetic flux detection in engineering practice; at the same time, it will also increase the cost of use and increase the difficulty of data processing

Therefore, the bridge cable force detection device based on magnetic flux detection has certain limitations in engineering applications.

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