원심진자 흡진기를 이용한 수력발전기 구동계 축소모델회전진동 저감 검토

The attenuation of rotational vibration in the drivetrain of a hydroelectric generator is evaluated using a down-sized model. The down-sized model of the drivetrain is developed so that the rotational dynamic characteristics i.e. natural frequencies and mode shapes of the model are identical to those of the original drivetrain. The transfer matrix representation of the down-sized model is introduced and verified by theoretical analysis and a computer simulation. Subsequently, the application of a simple centrifugal pendulum absorber (SCPA) to the down-sized model for the attenuation of the torsional vibration in the drivetrain is evaluated using the transfer matrix method (TMM). A transfer matrix representation of the model with SCPA is introduced. The effects of the SCPA are then studied by comparing the frequency response function (FRF) and time response of the system obtained with TMM. The results indicate that the SCPA is effective in reducing the rotational vibration in the down-sized model of the drivetrain.