能動空気軸受によるロータ系の自励振動の制御

概要

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An experimental study on the active control of self-excited vibration of a rotor system used in a gas expander is presented in this paper. The rotor is supported by two tilting-pad gas bearings(TPGB), each of which consists of three pads. One of the three pivots used to support the pads is fixed and the other two contain embedded piezoelectric actuators in each bearing. In a tilting-pad gas bearing, the shaft is supported by the pressurized gas film between the shaft and pads, the pressure distribution of which depends on the clearance. Since the clearance between the shaft and the pads can be changed by the application of voltage to the actuators, the force acting on the shaft can be actively controlled. Four gap sensors were used to measure the vibration of the shaft and PID was used in the feedback control of the shaft vibration. The experimental results show that the selfexcited vibration of the rotor can be effectively suppressed if the PID controller gains are properly chosen. The influence of the PID controller gains on the effectiveness of controller was also investigated.
2000-03-25