The book includes 34 revised and edited articles on aeroelasticity of blades, gas-dynamics of vibrating bladerows, rotor{stator interaction, aeroacoustics, and unsteady aerodynamics of turbomachines. The book is published in connection with the 11th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines (ISUAAAT-2006) held in Moscow, Russia, September 4{8, 2006. The Symposium was organized by P. I. Baranov Central Institute of Aviation Motors. The volume is addressed to research scientists dealing with unsteady processes in turbomachines and power plant designers and engineers.