针对某型船用燃气轮机高压涡轮叶片的缘板阻尼结构设计问题，开展阻尼结构参数敏感性分析。基于整体-局部统一滑动理论建立叶片-阻尼单接触对摩擦模型，采用谐波平衡法和能量法将非线性摩擦力等效线性化；考虑激振力相位差，迭代求解振动微分方程以获得叶尖幅值响应，找出影响阻尼减振效果的关键参数，分辨具有高敏感度的独立变量，获取阻尼结构初步设计方案。结果表明：缘板阻尼器的质量与刚度、阻尼选材及接触面宽度均属于高敏感度参数；阻尼器所受离心力与激振力幅值之比可作为结构设计过程中的独立变量；计算得到阻尼器设计质量在1.18~3.95 g之间，阻尼器轴向设计长度为31.2 mm。

Aiming at the design problem of underplatform damper structure for highpressure turbine blades of a marine gas turbine, the sensitivity analysis of damping structure parameters was carried out. A bladedamper single contact friction model was established based on the globallocal unified sliding theory, the nonlinear friction was linearized by the harmonic balance method and the energy method; the oscillatory differential equation was iteratively solved to obtain the amplitude response of the blade tip considering the phase difference of the excitation force, the key parameters affecting the damping effect were found out and the independent variables with high sensitivity were identified, and the preliminary design scheme of damper structure was obtained. The results show that the mass and stiffness of the underplatform damper, the selection of damping material and the width of the contact surface are all highly sensitive parameters; the ratio of the centrifugal force to the excitation force amplitude for the damper can be used as an independent variable in the process of structural design; the design mass of the damper is calculated to be in the range of 1.18 g to 3.95 g, and the axial length of the damper is 31.2 mm.

TK47