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从结构力学出发,对某发动机整体叶盘进行了盘片耦合振动特性分析,通过分析小展弦比带掠风扇转子叶片的共振转速、耦合颤振和失速颤振,发现了该小展弦比带掠风扇转子叶片存在2阶与3阶动频与静频振型发生变化的特殊现象,揭示了该小展弦比带掠风扇转子叶片为另一种耦合颤振的问题.通过对该小展弦比带掠风扇转子叶片的结构调整,找出了叶片前掠是该叶片发生此类特殊现象的重要影响因素,适当压缩该叶片的前掠后,从设计上避免了发生颤振的可能,提出叶片各阶频率的分离度需满足10%的设计要求.
Based on the structural mechanics, the disk-coupled vibration characteristics of an engine leaf disk were analyzed. By analyzing the resonance speed, coupling flutter and stall flutter of small aspect ratio swept fan blades, the small aspect ratio There is a special phenomenon that the swept-blade rotor blade has the changes of the second and third order of the moving frequency and the static frequency mode, revealing the problem that this small aspect ratio swept fan rotor blade is another coupling flutter. Aspect ratio of blade with swept fan blade structure adjustment to find the blade swept forward is the blade of such a special phenomenon an important factor in the appropriate compression of the blade after the swept forward, from the design to avoid the possibility of flutter occurs , Put forward that the resolution of each frequency of the blade should satisfy the design requirement of 10%.