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Coupled Bending–Bending–Axial–Torsional Vibrations of Rotating Blades

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Abstract

In this paper, the coupled bending–bending–axial–torsional free vibrations of rotating blades are investigated based on the Euler–Bernoulli beam model. The coupled partial differential equations governing flapwise, edgewise, axial and torsional motions are derived by the Hamilton’s principle, wherein three types of velocity-dependent terms, namely static centrifugal terms, dynamic centrifugal terms and gyroscopic coupling terms, are focused. The ordinary differential equations are acquired by the Galerkin truncation, and the natural frequencies in all directions and complex mode shapes of the rotating blades are analyzed in detail. It is revealed that the three types of velocity-dependent terms have different effects on the natural frequencies. The natural frequencies are noticeably dependent on the rotating speed and preset angle, except for the axial vibration, which is almost immune to the preset angle. The complex modal motions are displayed by a series of positions of the central line and free-end cross section for different time instants, showing the coupled vibrations among different directions.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (Project Nos. 11672007, 11672189), the Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University (VCAME201601) and Beijing Natural Science Foundation (Project No. 3172003).

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Authors and Affiliations

  1. College of Mechanical Engineering, Yangzhou University, Yangzhou, 225127, China

    Feng Liang

  2. Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Engineering, College of Mechanical Engineering and Applied Electronics, Beijing University of Technology, Beijing, 100124, China

    Feng Liang, Zhen Li, Xiao-Dong Yang & Wei Zhang

  3. Department of Engineering Mechanics, Shenyang Aerospace University, Shenyang, 110136, China

    Tian-Zhi Yang

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  1. Feng Liang
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  2. Zhen Li
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  3. Xiao-Dong Yang
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  4. Wei Zhang
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  5. Tian-Zhi Yang
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Correspondence to Feng Liang or Xiao-Dong Yang.

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Liang, F., Li, Z., Yang, XD. et al. Coupled Bending–Bending–Axial–Torsional Vibrations of Rotating Blades. Acta Mech. Solida Sin. 32, 326–338 (2019). https://doi.org/10.1007/s10338-019-00075-w

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  • DOI: https://doi.org/10.1007/s10338-019-00075-w

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