A Step-by-Step Damage Identification Method Based on Frequency Response Function and Cross Signature Assurance...

Area of Science:

• Structural Health Monitoring
• Mechanical Engineering
• Vibrational Analysis

Background:

• Accurate damage identification is crucial for structural integrity.
• Existing methods may lack precision or robustness.
• Frequency Response Functions (FRFs) offer valuable dynamic information.

Purpose of the Study:

• To develop a quantitative damage identification method for beams.
• To integrate FRF analysis with model updating techniques.
• To validate the method's effectiveness through simulations and experiments.

Main Methods:

• Utilizing cross-signature assurance criterion (CSAC) indices of FRFs.
• Establishing an objective function based on CSAC and natural frequencies.
• Applying the method to identify single and multiple damages in steel beams.

Main Results:

• The CSAC index within the first two natural frequencies is sensitive to damage.
• The proposed method accurately located and quantified simulated damages.
• Numerical simulations and laboratory tests confirmed the method's effectiveness.

Conclusions:

• The developed method provides a reliable approach for quantitative beam damage identification.
• The technique demonstrates robustness against systematic testing errors.
• Step-by-step damage localization and quantification are achievable.