涂敷硬涂层的整体叶盘振动特性与阻尼解析分析

Analytical analysis for vibration characteristics and damping of a hard-coating blisk

为了解决干摩擦阻尼黏弹在整体叶盘减振实施困难的问题,提出一种对叶片涂敷硬涂层的阻尼减振方法并进行了验证。创建了涂敷硬涂层的整体叶盘复合结构连续参数模型;基于Oberst梁和复模量理论推导了涂敷硬涂层的叶片的等效参数表达式,并利用里兹法求解了复合结构的固有特性;以叶片单面涂敷NiCoCrAlY+YSZ硬涂层的整体叶盘为研究实例进行数值计算,并与实验数据进行比较,同时研究了硬涂层对整体叶盘固有特性的影响,尤其是硬涂层厚度与面积对整体叶盘阻尼能力的影响。研究结果表明,NiCoCrAlY+YSZ硬涂层对固有频率有微小影响,变化范围在3%左右,但对模态损耗因子有着显著影响,大约增加了6倍,整体叶盘的共振响应受到明显抑制。

To solve the difficulty of dry friction damper implementation in vibration reduction of a blisk(integral bladed disk),a novel damping improvement method by depositing hard coating on blades was proposed and then verified in this study.Firstly,a continuous parameter model(CPM)of the composite structure of the hard-coating bladed disk was established.Then,equivalent parameters of the hard-coating blades were derived based on the Oberst beam and the complex modulus theories.Further,natural characteristics of the hard-coating blisk were obtained by using of the Ritz method.Finally,a blisk with depositing NiCoCrAlY+YSZ hard coating on single side of blades was taken to conduct numerical calculation.The results were compared with those obtained by experiment tests.Moreover,the influence of hard coating on natural characteristics of the hard-coating blisk was discussed,respectively.The influence of coating thickness and area on damping capacity were studied emphatically.Results reveal that the NiCoCrAlY+YSZ hard coating has a significant effect on modal loss factors(improve six times approximately),with slightly altering the natural frequencies(around 3%).The resonant response of the blisk can be suppressed remarkably.