转子叶片缘板阻尼器设计分析

Design Analysis of a Rotor Blade Underplatform Damper

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

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

摘要:

为了有效解决工程中转子叶片缘板阻尼器的设计分析问题，利用谐波平衡法代替高成本的非线性分析，建立阻尼器所能提供的阻尼比表达式，其中使用带圆角的平板模型来刻画缘板阻尼器的特征，获得接触面切向接触刚度，且其只随阻尼器轴向长度与接触区域宽度一半的比值以及材料参数的变化而改变。通过对叶片模型进行有限元分析，分析了不同设计参数对阻尼比特性曲线的影响，为阻尼器的设计和优化提供了理论依据。以本文的模型为例，在50MPa的许用振动应力下，当阻尼器质量约为6g时，该阻尼器所能提供的阻尼比最大，约为3.1%。该方法为缘板阻尼器设计提供了一种新的思路。

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.