Dynamic stability analysis of rotating asymmetric cross-section blade packets

In this paper static and dynamic stability of rotating asymmetric cross-section two-bladed packets subjected to uniform radial periodic force are studied using the finite element method. The effects of various parameters such as shroud dimensions, stagger angle, rotational speed and distance of shear center from the centroid on the stability of the blade packets are presented. The numerical results indicate that the coupling effect is important in frequency modes depending on shear center distance from the centroid. The increase in stagger angle makes the two-bladed packet less stable. However, the increase in rotational speed makes the two-bladed packet more stable.