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Mode shape description of an aero-engine casing structure using Zernike moment descriptors

LIU Ying-chao,  ZANG Chao-ping

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文章导航 > 航空动力学报  > 2011 >  26(4): 760-770
LIU Ying-chao, ZANG Chao-ping. Mode shape description of an aero-engine casing structure using Zernike moment descriptors[J]. 航空动力学报, 2011, 26(4): 760-770.
引用本文: LIU Ying-chao, ZANG Chao-ping. Mode shape description of an aero-engine casing structure using Zernike moment descriptors[J]. 航空动力学报, 2011, 26(4): 760-770.
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LIU Ying-chao, ZANG Chao-ping. Mode shape description of an aero-engine casing structure using Zernike moment descriptors[J]. Journal of Aerospace Power, 2011, 26(4): 760-770.
Citation: LIU Ying-chao, ZANG Chao-ping. Mode shape description of an aero-engine casing structure using Zernike moment descriptors[J]. Journal of Aerospace Power, 2011, 26(4): 760-770.
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Mode shape description of an aero-engine casing structure using Zernike moment descriptors

  • College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

基金项目: Supported by Research Fund for the Doctoral Program of Higher Education of China (20093218110008); The SRF for ROCS, SPM (No.R0861-21); Jiangsu Research Foundation of Talented Scholars in Six Fields (No.P0951-021); The Nanjing University of Aeronautics and Astronautics Postgraduate Innovation Fund

Mode shape description of an aero-engine casing structure using Zernike moment descriptors

  • College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Funds: Supported by Research Fund for the Doctoral Program of Higher Education of China (20093218110008); The SRF for ROCS, SPM (No.R0861-21); Jiangsu Research Foundation of Talented Scholars in Six Fields (No.P0951-021); The Nanjing University of Aeronautics and Astronautics Postgraduate Innovation Fund

    摘要
  • 摘要: Vibration mode shape description of an aero-engine casing structure using Zernike moment descriptor (ZMD) was introduced in this paper. The mode shapes of the aero-engine casing structure can be decomposed as a linear combination of a series of Zernike polynomials, with the feature of each Zernike polynomial reflecting a part of characteristic of mode shapes, based on Zernike moment transformation. Meanwhile, the reconstruction of mode shapes with ZMD was explored and its ability to filtering the noise contaminated in the mode shapes was studied. Simulation of the aero-engine casing structure indicated the advantage of this method to depict the mode shapes of a symmetric structure. Results demonstrate that the Zernike moment description of the mode shapes can effectively describe the double modes in the symmetric structure and also has the ability to remove or significantly reduce the influence of noise in the mode shapes. Such feature shows great practical value for further research on the correlation, model updating and model validation of the symmetric structure's finite element model.

     

    Abstract: Vibration mode shape description of an aero-engine casing structure using Zernike moment descriptor (ZMD) was introduced in this paper. The mode shapes of the aero-engine casing structure can be decomposed as a linear combination of a series of Zernike polynomials, with the feature of each Zernike polynomial reflecting a part of characteristic of mode shapes, based on Zernike moment transformation. Meanwhile, the reconstruction of mode shapes with ZMD was explored and its ability to filtering the noise contaminated in the mode shapes was studied. Simulation of the aero-engine casing structure indicated the advantage of this method to depict the mode shapes of a symmetric structure. Results demonstrate that the Zernike moment description of the mode shapes can effectively describe the double modes in the symmetric structure and also has the ability to remove or significantly reduce the influence of noise in the mode shapes. Such feature shows great practical value for further research on the correlation, model updating and model validation of the symmetric structure's finite element model.

     

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    • 参考文献(16)
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出版历程
  • 收稿日期:  2010-11-15
  • 修回日期:  2011-03-07
  • 刊出日期:  2011-04-28

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