Damping performance of the underplatform damper was numerically investigated on the basis of a simplified model of blades with an underplatform damper. The harmonic balance method was employed to predict the blade response in the frequency domain. A simple expression of the Jacobian matrix by means of discrete Fourier transform was proposed

allowing acceleration of the harmonic balance method. Result showed that

the computational efficiency was improved more than 8 times in terms of blade response prediction. The impacts of key parameters

including centrifugal force

damper mass

excitation level

underplatform angle and the rolling motion of the damper

were thoroughly investigated.