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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (12): 226140-226140.doi: 10.7527/S1000-6893.2021.26140

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Improved formula for prediction of self-sustained oscillation frequencies of bay-opening cabin with landing gear

YAN Rong1, HE Yiwen1, LI Kaixiang2, LI Peng2, MU Rangke2, SHI Aiming1   

  1. 1. NPU-Duke Aerodynamics and Aeroelasticity Group, College of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
    2. Key Laboratory of Aeronautical Acoustics and Vibration, Aircraft Strength Research Institute of China, Xi'an 710065, China
  • Received:2021-07-21 Revised:2021-10-15 Published:2021-11-10
  • Supported by:
    The Project of the Ministry of Industry and Information Technology of China (CARP-2018F8-3); National Natural Science Foundation of China (10602046)

Abstract: The flow pattern of the bay-opening landing gear configuration produces self-sustained oscillations, causing comfort and safety issues. A deep research on the flow pattern and resonance mechanism is the key to solve the issues. In this paper, Delayed Detached Eddy Simulation (DDES) is used to analyze the flow characteristics and aerodynamic characteristics of the typical bay-opening landing gear configuration. Combining the Rossiter formula and the vortex-acoustic coupling closed-loop feedback mechanism, a method is proposed to modify the formula for self-excited oscillation frequency prediction for the landing gear cabin. The method can take into account the influence of the unequal height of the front and rear walls of the cabin, the arc fairing and the landing gear. The improved formula is verified by power spectrum dominant frequency comparison. Besides, Dynamic Mode Decomposition (DMD) is introduced to analyze the mechanism of self-sustained oscillation. Analysis results show that with the increase of the number of modes, wall pressure fluctuation develops from the trailing edge to the leading edge in the cabin.

Key words: cavity, cabin, landing gear, self-sustained oscillation, flow pattern

CLC Number: