Bridge Dynamic Weighing Method Based on Distributed Long Gauge Fiber Bragg Grating Sensor

Abstract

The invention discloses a bridge-type dynamic weighing method based on a distributed long-gauge optical fiber grating sensor, which includes marking one row of four section positions along the longitudinal direction directly under each lane of the bridge; installing distributed long-gauge optical fibers at the marking positions Grating sensor; the long gauge bending strain collected in the first three sections and the last three sections of each column is used as the second order difference in the group; the corresponding peak time on the two long gauge strain curvature curves is counted, divided by the sensor distance The vehicle speed is obtained by the corresponding peak time difference; the peak interval time on each long gauge strain curvature curve is counted, and the obtained vehicle speed is obtained as the vehicle wheelbase; the peak value on the long gauge strain curvature curve is counted to obtain the vehicle axle load. The invention uses fewer sensors in vehicle dynamic weighing, and at the same time has stronger durability and high precision, is suitable for bridges with simply supported beams and continuous beam structures, and can realize low-cost and large-scale application to assist road traffic management.

Description

technical field [0001] The invention relates to the field of vehicle weighing methods, in particular to a bridge-type dynamic weighing method based on distributed long-gauge fiber grating sensors. Background technique [0002] Because the long-term reciprocating upper vehicle load will cause the gradual decline of bridge performance, the monitoring of vehicle load can help to predict the performance trend of the bridge on a daily basis. In order to measure the axle load of the upper vehicle, currently existing technologies include static weighing technology and dynamic weighing technology. Although the current static weighing technology is very accurate, it is very time-consuming and expensive to measure. The dynamic weighing system can measure under the normal operating state of the vehicle, which has obvious advantages over static weighing technology. [0003] At present, dynamic weighing systems can be roughly divided into two categories: road-type dynamic weighing syst...

AI Technical Summary

Problems solved by technology

However, traditional strain gauges are relatively fragile, prone to failure due to structural cracking, and are also susceptible to external electromagnetic interference and chemical erosion

Therefore, system life and accuracy cannot be guaranteed

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