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

Table 4

Parameters of the blade torsional vibration.

Symbols	Properties	Remarks
	Time
	Vibration frequency of torsion angle
	Instantaneous torsional angle of a blade cross section	Depending on the shape of the blade cross section and time, as a function of and
	Vibration amplitude of torsion angle of a blade cross section	Depending on the shape of the blade cross section, as a function of