Maximum Resonant Response of Mistuned Bladed Disks
Maximum Resonant Response of Mistuned Bladed Disks
复制标题
失谐叶片盘的最大共振响应
DOI：
10.1115/1.3269172
复制
发表时间：
1984
影响因子：
1.7
通讯作者：
P. Whaley
中科院分区：
文献类型：
--
作者：
J. Macbain;P. Whaley
在当今先进的涡轮机发动机中使用的涡轮叶片盘必须满足关于气动弹性稳定性和强迫共振响应的严格标准。可以显著影响这两个区域的叶盘的一个结构特征是叶盘失谐。当叶盘中存在某些周向不对称性时，会发生失谐。这种不对称性可能是由于质量或刚度偏心或单个叶片特性的轻微变化等原因造成的，并且在所有叶盘中或多或少地发生。失谐引起的一个重要的结构现象是叶片盘的径向振动模式分裂成“孪生”或“双”模式。双模态特性的存在会显著影响叶盘的气动弹性稳定性和共振响应特性中的一个或两个。本文在Tobias和Arnold [1]以及Ewins [2]的早期工作的基础上，讨论了失谐叶盘的最大共振响应的预测问题，该叶盘具有作为模态失谐和模态阻尼的函数的密集双模态。导出了最大强迫共振响应的封闭形式表达式。文中还讨论了典型双叶片轮盘的失谐和阻尼特性。
The turbomachinery bladed disks used in today’s advanced turbine engines must meet strict standards with regard to aeroelastic stability and forced resonant response. One structural characteristic of bladed disks that can significantly impact both of these areas is that of bladed disk mistuning. Mistuning occurs when some circumferential asymmetry exists in the bladed disk. This asymmetry can be due to such things as mass or stiffness eccentricity or slight variations in the individual blade properties and occurs in all bladed disks to a greater or lesser extent. One important structural phenomenon resulting from mistuning is the splitting of the bladed disk’s diametral modes of vibration into “twin” or “dual” modes. The presence of dual mode characteristics in a bladed disk can significantly affect either or both of its aeroelastic stability and resonant response characteristics. The present paper, expanding upon the earlier works of Tobias and Arnold [1] and of Ewins [2] addresses the prediction of the maximum resonant response of a mistuned bladed disk having closely spaced dual modes as a function of mode mistuning and modal damping. A closed form expression is derived for the maximum forced resonant response. A discussion of mistune and damping characteristics of typical turbomachinery bladed disks is also presented.