Inhaltszusammenfassung

In this paper, the temperature scaling approach (TS) for temperature compensation of guided ultrasonic waves (GUW) is presented. In many previous works, it could be observed that the amplitudes of the GUW change with temperature. In the TS approach, it is assumed that for each transducer configuration several functions $$M\left( f,T\right) $$Mf,Texist that describe the change of the maximum amplitude depending on the frequency f and the temperature T. It is also assumed that several functions...In this paper, the temperature scaling approach (TS) for temperature compensation of guided ultrasonic waves (GUW) is presented. In many previous works, it could be observed that the amplitudes of the GUW change with temperature. In the TS approach, it is assumed that for each transducer configuration several functions $$M\left( f,T\right) $$Mf,Texist that describe the change of the maximum amplitude depending on the frequency f and the temperature T. It is also assumed that several functions $$F\left( f,T\right) $$Ff,Texist that describe the changes of the full width at half maximum (FWHM) from the amplitude containing the maximum value of the measurement. Furthermore, it is assumed that the functions $$M\left( f,T\right) $$Mf,Tand $$F\left( f,T\right) $$Ff,Talso depend on the medium in which the GUW propagate, so that a change of the medium results in a change of the functions. This means that these functions can be used for damage detection. GUW data from the http://openguidedwaves.de/database were analyzed with the TS approach. Data from a carbon fiber reinforced polymer plate with a temperature range from 20 $$^\circ $$∘C to 60 $$^\circ $$∘C were analyzed for different actuator-sensor paths and compared with position-dependent artificial defects. To determine the functions $$M\left( f,T\right) $$Mf,Tand $$F\left( f,T\right) $$Ff,T, polynomials were fitted to the measured values of the maxima and full FWHM. The TS analysis showed a detect ability of the artificial defects over the entire temperature range.» weiterlesen» einklappen

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