Date of download: 10/10/2017 Copyright © ASME. All rights reserved. From: Detection of a Rotor Crack Using a Harmonic Excitation and Nonlinear Vibration Analysis J. Vib. Acoust. 2006;128(6):741-749. doi:10.1115/1.2346693 Figure Legend: Experimental system (shaft length l=730mm and its diameter d=12mm. Disk-rotor position ld=200mm, disk diameter 220mm, and thickness 15.3mm. Crack position lc=460mm, width wc=20mm depth dc=4mm. Sensor position ls=45mm from the disk. Rotating shaft is excited in the horizontal direction at position le=290mm)