1. Formulas for natural frequencies and mode shape;Blevins,1979
2. Charge amplifier–Type 2635;Bruel & Kjaer Product Data Sheet,1999
3. Calibration exciter–Type 4294;Bruel & Kjaer Product Data Sheet,1999
4. Product data sheet–torsional vibration meter Type 2523;Bruel & Kjaer,2003
5. Production data sheet–Type 8330 scanning laser doppler vibrometer;Bruel & Kjaer/Ormetron,2003