叶盘振动失谐敏感性与频率转向特性内在关系研究  

Correlation Between Frequency Veering and Vibration Mistuning Sensitivity of a Bladed Disk

作　　者：赵志彬[1] 贺尔铭[1] 王红建[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《机械科学与技术》2010年第12期1606-1611,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(50775181)资助

摘　　要：叶盘结构频率转向现象是叶片模态与轮盘模态间相互耦合的结果,它直接影响着叶盘结构受迫振动响应对叶片失谐的敏感性。笔者基于真实叶盘结构的有限元模型,针对不同的叶片刚度失谐,分析了谐调叶盘、失谐叶盘受迫振动响应中各叶片的最大振动能量及叶片振动能量分布的局部化程度,研究了叶盘结构频率转向曲线上的不同位置、激振力频率及叶盘受迫振动响应对叶片失谐的敏感性三者之间的内在关系。研究结果表明,当激振力频率在频率转向点附近时,叶盘受迫振动响应对叶片失谐最敏感。最后,笔者给出了频率转向曲线上的不同位置与叶盘振动对叶片失谐敏感性强弱间的对应关系图。Frequency veering in bladed disks is the result of modal compression,concentration,and interaction in a small frequency range,which influence the sensitivity of bladed disk forced response to mistuning.Based on the finite element model（FEM） of a bladed disk,the maximal vibration energy of a blade and blade vibration energy localization parameters in the forced response are analyzed in tuned and a wide range of blade mistuning degree.The relationship among the various operation zones of tuned system frequency veering,excitation frequency and mistuning sensitivity （MS） where the forced response of a bladed disk increases as a result of mistuning is researched.The results imply that the maximum MS occurs around the freqency veering points at a critical degree of random mistuning.Finally,qualitative relationship between MS and the various operation zones of tuned system frequency veering is determined.

关 键 词：叶盘结构 频率转向 失谐敏感性 受迫振动 局部化 

分 类 号：V231.92[航空宇航科学与技术—航空宇航推进理论与工程]