Temperature Sensitivity and Compensation Method of Cable Force Measurement Using Magnetic Resonance
Magnetic resonance cable-force measurement is a novel cable-force detection method with high sensitivity.To reduce the temperature error in this method,the correlation between the induced voltage,cable force,and temperature was analyzed based on the magnetoelastic effect and magnetic resonance phenomenon.First,a double-coil magnetic resonance sensor was fabricated,and a load-temperature coupling test system was built in a water bath environment.Subsequently,a comparison test was conducted in the air and water bath environments,and a constant temperature variable load test and constant load variable temperature test were conducted in the water bath environment.The results show that for the water bath and air environments,the induced voltage increment in the magnetic resonance sensor's secondary coil has the same variation trend as the tension of the strand.Additionally,under the same working conditions,the hysteresis curve sensitivity kV/F and hysteresis D of each specimen have a small difference,and the maximum percentage differences are 7.1％and 3.8％,respectively.This shows that the proposed magnetic resonance cable-force measurement method has a reliable stability and repeatability.Compared with the air environment,the sensitivity of the constant-temperature variable load curve kV/F decreases by 7.5％on average,and the hysteresis D increases by 6.1％on average;however,the differences between the two is small,indicating that it is feasible and effective to conduct the test in a water bath environment.Moreover,the curve of the induced voltage with the tension at low temperatures has a higher sensitivity and lower hysteresis,and the sensitivity decreases by 47.8％as the temperature increases from 25 ℃ to 80 ℃.In the range of 0 ℃-60 ℃,there is an approximate linear positive correlation between the induced voltage and temperature during the heating and cooling processes in each working condition,and the accuracy of the linear fit is higher than 0.96.A temperature-fitting curve was then used to compensate for the temperature of the specimen under different load conditions,where the maximum error is within 3％.Therefore,temperature compensation in the magnetic resonance cable-force measurement method should be performed based on the temperature compensation curve.
bridge engineeringcable force measurementload-temperature coupling testreso-nance of magnetic fieldtemperature compensation
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