A Torsional Vibration Measurement Method for Rotating Blades Based on Blade Tip Timing

Table 2

Natural frequency and mode shape classification.

Mode order	Natural frequency (Hz)	Mode shape classification
1^st	59.345	Bending vibration
2^nd	264.41	Bending vibration
3^rd	333.18	Torsional vibration
4^th	510.05	Bending vibration
5^th	656.63	Bending vibration
6^th	726.47	Torsional vibration