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Application of improved hybrid interface substructural component modal synthesis method in vibration characteristics of mistuned blisk

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Abstract

The large and complex structures are divided into hundreds of thousands or millions degrees of freedom(DOF) when they are calculated which will spend a lot of time and the efficiency will be extremely low. The classical component modal synthesis method (CMSM) are used extensively, but for many structures in the engineering of high-rise buildings, aerospace systemic engineerings, marine oil platforms etc, a large amount of calculation is still needed. An improved hybrid interface substructural component modal synthesis method(HISCMSM) is proposed. The parametric model of the mistuned blisk is built by the improved HISCMSM. The double coordinating conditions of the displacement and the force are introduced to ensure the computational accuracy. Compared with the overall structure finite element model method(FEMM), the computational time is shortened by 23.86%–31.56% and the modal deviation is 0.002%–0.157% which meets the requirement of the computational accuracy. It is faster 4.46%–10.57% than the classical HISCMSM. So the improved HISCMSM is better than the classical HISCMSM and the overall structure FEMM. Meanwhile, the frequency and the modal shape are researched, considering the factors including rotational speed, gas temperature and geometry size. The strong localization phenomenon of the modal shape’s the maximum displacement and the maximum stress is observed in the second frequency band and it is the most sensitive in the frequency veering. But the localization phenomenon is relatively weak in 1st and the 3d frequency band. The localization of the modal shape is more serious under the condition of the geometric dimensioning mistuned. An improved HISCMSM is proposed, the computational efficiency of the mistuned blisk can be increased observably by this method.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Beihang University, Beijing, 100191, China

    Bin Bai, Guangchen Bai & Chao Li

Authors
  1. Bin Bai
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  2. Guangchen Bai
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  3. Chao Li
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Corresponding author

Correspondence to Bin Bai.

Additional information

Supported by National Natural Science Foundation of China(Grant Nos. 51375032, 51335003)

BAI Bin, born in 1984, is currently a PhD candidate at School of Energy and Power Engineering, Beihang University, China. His research interests include system dynamics, intensity, vibration, reliability, robustness design and structure optimization of the aeroengine.

BAI Guangchen, born in 1962, is currently a professor and a PhD candidate supervisor at School of Energy and Power Engineering, Beihang University, China. His research interests include system dynamics and intensity, vibration, reliability, and structure optimization of the aeroengine.

LI Chao, born in 1973, is currently an associate professor and a master supervisor at School of Energy and Power Engineering, Beihang University, China. His research interests include system dynamics, intensity, vibration, reliability.

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Bai, B., Bai, G. & Li, C. Application of improved hybrid interface substructural component modal synthesis method in vibration characteristics of mistuned blisk. Chin. J. Mech. Eng. 27, 1219–1231 (2014). https://doi.org/10.3901/CJME.2014.0910.148

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  • DOI: https://doi.org/10.3901/CJME.2014.0910.148

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