The Micro-Slip Damper Stiffness Effect on the Steady-State Characteristics of Turbine Blade

Abstract

In this paper, a comprehensive study of frictiondamper stiffness effects on the responsecharacteristics of a typical turbine blade executingsteady-state motion, is explored. The damper ismodeled as a one-bar microslip type assembled inthe intermediate platform attachment of the bladeleaving the other attachment of a shroud mass atthe blade tip to be free. A discrete lumped massapproach, previously theorized in another paper, isemployed to predict the response amplitudes as wellas the slip length parameter at any state of theforced frequency including the resonancecondition. The analysis covers a practical range ofdamper stiffness values adapted from relevantstudies in this field. The present main outputs showthat a magnificent rising of the response occurswith the increase in the stiffness, the characteristicbehavior varies appreciably and the resonantamplitudes tend to increase linearly at high levels ofdamper stiffness, whereas the correspondingfrequency and slip length show almost uniformtrend. The results can serve very well for design andcontrol purposes in the pre-manufacture stages ofthe given blade-damper system.

Keywords

Blade, stiffness