Detection of Bolt Looseness Based on Average Autocorrelation Function

<div>Vibration pixel displacements at P1. (a) Pixel displacement for the undamaged structure. (b) Pixel displacement for the structure of bolt B2 looseness.</div>

Shock and Vibration

fig7

Figure 7

Figure 7: Detection of Bolt Looseness Based on Average Autocorrelation Function 