关键词: 缘板阻尼器;谐波平衡法;切向接触刚度;阻尼比特性曲线;阻尼器设计

Abstract: 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.

Key words: Underplatform damper;Harmonic balance method;Tangential contact stiffness;Characteristic curve of damping ratio;Damper design