Is damage identification using vibration data in a population of cylinders feasible?

Vibration data of a population of cylinders were measured and modal analysis was employed to obtain natural frequencies and mode shapes. Mode shapes were transformed into the coordinate modal assurance criterion (COMAC). Modal energies were extracted by calculating the integrals of the real and imaginary components of the frequency response functions over frequency ranges that bracket the natural frequencies of the system. Modal energies were transformed into the coordinate modal energy assurance criterion (COMEAC). It is observed that using modal energies and modal properties directly is better than using the correlation criteria such as the COMEAC and COMAC respectively.