An Experimental Comparison of Modal-Based SHM Techniques Using Strain or Acceleration Measurements

This work presents experimental results for structural health monitoring methods based on modal properties. Two test subjects are considered for the study - a simple composite beam in T-shape and a more complex and realistic system, a composite helicopter main rotor blade (MRB). Different sorts of sensors are used for the purpose of identifying damage, such as piezo strain sensors and accelerometers for the composite T-beam and just accelerometers for the helicopter MRB. Damage is simulated on the test objects by attaching a small mass to different locations. The damage detection methods studied are the coordinate MAC (COMAC), enhanced COMAC (eCOMAC) and scaled COMAC (sCOMAC). The modal properties from the composite T-beam and from the helicopter MRB are obtained using a least squares fit (PolyMAX) and the various techniques mentioned above are implemented and compared.

ISBN:9781605951157

Jaar van publicatie:2013