STEADY-STATE RESPONSE AND STABILITY OF ROTATING COMPOSITE BLADES WITHFRICTIONAL DAMPING

Friction dampers are widely used to improve the performance of rotatin g blades. This paper is concerned with the steady state response and s tability analysis of rotating composite plates in the presence of non linear friction damping. Direct Integration Method (DIM) and Harmonic Balance Method (HBM) are used to determine the steady state response d ue to periodic lateral external forces. In addition, an alternate proc edure Hybrid Method (HM) is proposed for this analysis to substantiate the results from DIM and HEM. The analysis shows that the steady stat e response is a function of friction damping magnitude as well as its location besides the excitation frequency and the rotational speed. A stability analysis of the composite blades is also mane by including p eriodic in-plane excitation using Floquet-Liapunov theory.