Investigation on the distribution mechanism of coupling mode frequencies of a blisk system

• Published in: Mechanical systems and signal processing 2024-09, Vol.218, p.111549, Article 111549
• Main Authors: She, Houxin, Li, Chaofeng, Zhang, Haoyan, Xia, Xin, Zang, Chaoping
• Format: Article
• Language: English
• Subjects: Bladed disk; Coupling vibration; Distribution property; Frequency distribution
• ISSN: 0888-3270; 1096-1216
• DOI: 10.1016/j.ymssp.2024.111549

The coupling vibration of the blisk system has recently become an important area of research. The literature review indicates that the coupled behavior in the blisk system induces conspicuous distribution properties of modal frequencies of the blade-dominated family. However, this distribution rules and its evolution mechanism have not been fully interpreted in previous research. Therefore, present study will carry out three aspects of research work: In the first part, an analytical method has been developed to determine the coupling behavior between disk-dominated and blade-dominated families of modes for different blade number cases. The eigenvalue is firstly depicted as a function of the blade number to explain the distribution law of coupling modal frequencies. In the second part, experimental research is performed to exploit and verify the representative phenomenon in the blisk system. In the third part, a representative lumped-parameter (LP) model is proposed to simulate the blisk structure, and its analytical expressions of eigenvalue are formulated and discussed to explain the universality of the distribution rules of cycle blades’ coupling modes.