Damage detection using vibration measurements

This paper presents work in progress towards the development of an Armored Vehicle Launched Bridge (A VLB) condition assessment system using vibration measurements. The system will eventually employ a remote laser vibration sensor. This paper presents free vibration analysis of natural frequencies, mode shapes, and strain energy variations of free-free aluminum beams having transverse cut(s). Preliminary results indicate that natural frequencies and mode shapes do not change significantly as a result of damage. However, strain energy calculations based on modal test data showed significant change in the vicinity of damage.