Table 2: Predicted results for single sensors and hybrid sensors.

DataActual crack size⁢ICM⁢PZT⁢Hybrid sensor
Reported crack sizeRelative errorPredicted crack sizeRelative errorPredicted crack sizeRelative error

I17.541 mm19.15 mm9.17%16.532 mm5.75%17.405 mm0.78%
II19.024 mm20.55 mm8.02%16.661 mm12.42%17.958 mm5.6%
III22.174 mm24.75 mm11.62%18.936 mm14.6%20.875 mm5.86%