1. Nonproportional Intentionally Mistuned Turbine Blisk Design with Improved Component Modal Synthesis
- Author
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Qi Yang, Xin ye Li, Guang wei Zhu, Bin Bai, and Qi liang Wu
- Subjects
Article Subject ,Computer science ,020209 energy ,Mechanical Engineering ,Physics ,QC1-999 ,02 engineering and technology ,Degrees of freedom (mechanics) ,Mistuning ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,01 natural sciences ,Turbine ,Finite element method ,010305 fluids & plasmas ,Vibration ,Modal ,Mechanics of Materials ,Control theory ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Flutter ,Sensitivity (control systems) ,Civil and Structural Engineering - Abstract
An improved component modal synthesis-based nonproportional mistuning method (ICMS-NPMM) is proposed to investigate mistuned turbine blisks (MTBs) since the high-fidelity finite element models (HFEMs) involve large number of computations, which leads to low calculation efficiency. To reduce degrees of freedom and suppress the flutter of MTB, it is divided into mistuned blade structure and tuned disk structure, and the intentional mistuning is considered. Furthermore, the mistuned parameters, nonproportional mistuning, and complex loads are also considered. Firstly, the basic theory of ICMS-NPMM is investigated; secondly, the model of MTB is established via ICMS-NPMM; finally, the intentionally mistuned design of modal shape amplitudes (MSAs) is investigated via ICMS-NPMM. The results indicate that the calculation efficiency is enhanced via ICMS-NPMM relative to that of via HFEM. In addition, the sensitivity and the flutter are decreased; meanwhile, the amplitude fluctuations of MSAs are distinctly decreased and become comparatively smooth. This investigation provides an important guidance for the vibration characteristic study of complex mechanical structures in engineering practice.
- Published
- 2021
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