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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (5): 225249-225249.doi: 10.7527/S1000-6893.2021.25249

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

Optimization design of dynamic vibration absorbers for vibration and noise reduction of composite fairing

LI Hangxing1, HU Dike2, WU Shaoqing1,3   

  1. 1. Department of Engineering Mechanics, Southeast University, Nanjing 211189, China;
    2. Aerospace System Engineering Shanghai, Shanghai 201109, China;
    3. Jiangsu Engineering Research Center of Aerospace Machinery, Southeast University, Nanjing 211189, China
  • Received:2021-01-11 Revised:2021-02-21 Published:2021-02-24
  • Supported by:
    Jiangsu Excellent Youth Fund (BK20180062); Jiangsu Province "Six Talent Peaks" High-level Talent Project (B Type)(KTHY-005); Shanghai Aerospace Science and Technology Innovation Fund (SAST2018-025)

Abstract: The sound insulation design of the fairing on rockets is important for the model selection, tests and safe operation of the internal equipment. To improve the vibro-acoustic environment and the sound insulation performance of the fairing, we first conduct the equivalent mechanical modelling of the composite fairing. Then, based on the basis changes, the dimension reduction method is proposed in the modal space to optimize the Dynamic Vibration Absorber (DVA) by considering the coupled modes. Finally, the optimization design for the location and material parameters of dynamic vibration absorbers is performed based on the equivalent mechanical modelling of the fairing. Numerical simulations are conducted on a composite fairing to verify the proposed method. Results of the fairing with a total mass of 1 177.3 kg show that under the constraint of the additional mass, the Root Mean Square (RMS) value of the sound power level in the frequency band 0-100 Hz is reduced from 254.8 dB to 238.8 dB after the addition of the dynamic vibration absorbers with a total mass of 14.6 kg. The vibration and noise level in the designed frequency band is significantly reduced and the vibro-acoustic environment is improved.

Key words: rocket fairing, paper honeycomb panel, dynamic vibration absorber, coupled modes, vibration and noise reduction, dimension reduction method

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