Finite element analysis of actively controlled heavy rotor using PVDF
piezoelectric layer as sensor and actuator
Reduction in the torsional vibration of heavy rotors like
turbo-generator rotor is important for the safe and efficient
functioning of the power plant. In this paper theoretical study is
performed to control the torsional vibration in the turbo-generator
rotor using piezoelectric material as sensor and actuator.
Polyvinylidene fluoride (PVDF) layer is used as sensor and actuator.
Proportional and velocity feedback is used as control law. The variation
in the electromagnetic torque of synchronous generator during various
electrical faults is evaluated using dq0 model. Finite element method is
used to model the rotor elements. The coupled equations are solved in
MATLAB using Newmark-beta integration method. The coupling elements of
turbine and generator are most susceptible to the shear failure so
torsional vibration of coupled rotor on coupling elements are compare
for controlled and uncontrolled scenario. Simulation results show that
for actively controlled rotor significant reduction in the amplitude of
torsional vibrations is observed.