Design Analysis of a Rotor Blade Underplatform Damper

To effectively solve the problem of design analysis for the underplatform damper of rotor blade in engineering, harmonic balance method is used to replace the high-cost nonlinear analysis, and the expression of damping ratio provided by the damper is established. Using a flat rounded contact model to characterize the underplatform damper, the tangential contact stiffness of the contact surface is obtained, and it only changes with ratio of damper axial length to half-width of the contact area and material parameters. Through the finite element analysis of the blade model, the influence of different design parameters on the characteristic curve of damping ratio is analyzed, which provides a theoretical basis for the design and optimization of the damper. Taking the model in this paper as an example, given the allowable vibration stress of 50MPa, when the mass of the damper is about 6g, the damper can provide the maximum damping ratio, which is about 3.1%.This method provides a new idea for the design of the underplatform damper. © 2020, Editorial Department of Journal of Propulsion Technology. All right reserved.