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

Table 5

Parameters of numerical simulation without bending of rigidity axis.

Symbols	Properties	Value
	Presetting angle of blades (rad)	0.6117
	Axial length of blade tip (mm)	28
	Vibration amplitude of torsion angle of blade tip (rad)	0.05
	Rotation frequency of torsion angle of blade tip (Hz)	726.47
	Axial distance between point A and D (mm)	10
	Vibration frequency of rotating shaft (Hz)	80
	Number of rotation cycles of rotating shaft	80
	Number of virtual BTT sensors	25
	Number of real BTT sensors	4.