Abstract: A new method to measure the torsional vibration of rotor is established. This method achieves the features of torsional vibration of rotor through extracting and analyzing the dynamic strain signals directly, which is transformed from the torsional vibration of rotor by designing a special instrument. The reinforcement and compensation and multiple channel redundancy of signals are realized by using space symmetric structure of resistance strain gauge. Experimental results show that the method has the characteristics of high sensitivity and accuracy, and it can be assembled and operated easily. It is a promising method to measure the torsional vibration of rotor.

Key words: rotor, torsional vibration, instrument measuring torsional vibration, the principle of inertia, resistance strain gauge, dynamic strain