干摩擦阻尼结构对失谐叶盘振动局部化的约束作用

为了研究干摩擦阻尼结构对失谐叶盘系统振动局部化的影响,采用能够复现局部微动滑移特征的三维微滑移干摩擦模型和抗混叠时频域融合算法,对含干摩擦阻尼结构的失谐叶盘系统进行了强迫振动的计算模拟。比较了考虑围带处干摩擦阻尼和未考虑干摩擦阻尼时叶片振动响应的变化及局部化因子的大小,并研究了干摩擦阻尼参数在失谐叶盘系统减振控制中的影响规律。计算结果表明:干摩擦阻尼结构可降低失谐叶盘系统振动响应的局部化程度,叶片间的摩擦约束力完全不同,每支叶片所对应的最优初始正压力及最优摩擦系数均不相同。由于干摩擦阻尼结构对失谐叶盘中每支叶片的减振效果存在差异,在进行失谐叶盘系统减振设计时需考虑摩擦控制参数与各个叶片之间的匹配问题。

Effect of the dry friction damping structure on the localized vibration of mistuned bladed disk

In order to study the effect of the dry friction damping structure on the localized vibration of mistuned bladed disk, the forced vibration response of a mistuned bladed disk with dry friction damping structure is investigated by using three-dimension microslip friction contact model which could reproduce the characteristics of local micro-motion slip and anti-aliasing hybrid frequency-time domain method. The variation of blade vibration response and the change of localization factor are compared with considering dry friction damping at the blade shroud and not considering dry friction damping. And the influence of the dry friction damping parameters on the vibration control of mistuned bladed disk system is discussed. The results show that the dry friction damping structure can reduce the degree of localization of the vibration response of the mistuned bladed disk system, the friction force between the blades is completely different, and the optimal initial normal pressure and the optimal friction coefficient for each blade are different. Therefore, the effect of the dry friction damping structure to each blade of the mistuned bladed disk is different, and the vibration reduction design of the mistuned bladed disk needs to consider the matching relationship between control parameters and mistuned blade.