Advertisement

Accurate numerical simulation on the structural response of the VEGA payload fairing using modal coupling approach

  • H. Schmidt
  • S. Koh
  • A. Dafnis
  • K.-U. Schröder
  • W. Schröder
Original Paper
  • 23 Downloads

Abstract

Structural aeroacoustic interactions are of great interest in the design and manufacture of aerospace structures. During the lift off and the early phases of the launch various external loads like steady accelerations, random and broadband frequency vibrations, acoustic loads due to jet noise and fluid–structure interactions act on the lightweight panel structure of the payload fairing. Thereby internal vibrational loads and instability effects may be caused by the interaction of various mechanical loads and acoustic noise acting on the cylindrical shell structure. Within the project “Prediction of Acoustic Loads on Space Structures” funded by the European Space Agency (ESA) an aeroelastic coupling approach has been built up. Therein, the aerodynamic loads on the VEGA payload fairing (PLF) have been determined for different flight conditions by the use of the open-source CFD solver SU2. Due to the different discretization between the computational fluid dynamics (CFD) and computational structural dynamics (CSD) mesh the approach of Radial Basis Function (RBF) has been used to interpolate the resulting pressure distribution onto the structural model. According to that the dynamic response of the PLF has been analyzed by taking the basic aerodynamic forces, structural vibration and acoustic pressure fluctuations into account. An intrinsic part of this work is the numerical simulation and assessment of the interaction between structural vibrations, transonic flow and acoustic pressure fluctuations during the early launch phase.

Keywords

Aeroelasticity Structural response VEGA payload fairing 

Notes

Acknowledgements

The work presented in this paper has been undertaken on behalf of the European Space Agency (ESA) under the Subject no. ESA AO 1-7954/15/NL/SW.

References

  1. 1.
    Economon, Thomas D., et al.: SU2: an open-source suite for multiphysics simulation and design. AIAA J. 54(3), 828–846 (2016)CrossRefGoogle Scholar
  2. 2.
    Beckert, A., Wendland, H.: Multivariate interpolation for fluid–structure-interaction problems using radial basis functions. Aerosp. Sci. Technol. 5, 125–134 (2001). (Art. No. 5125) CrossRefGoogle Scholar
  3. 3.
    Neumann, J., Krüger, W.: Coupling Strategies for Large Industrial Models, Computational Flight Testing, vol. 123. Series Notes on Numerical Fluid Mechanics and Multidisciplinary Design. pp. 207–222 (2012)Google Scholar
  4. 4.
    Sanchez, R., et al.: Assessment of the fluid–structure interaction capabilities for aeronautical applications of the open-source solver SU2. In: VII European Congress on Computational Methods in Applied Sciences and Engineering (2016)Google Scholar
  5. 5.
    Capri, F., et al.: Linearized aeroelastic analysis for a launch vehicle in transonic flight conditions. J. Spacecr. Rockets 43(1), 92–104 (2006)CrossRefGoogle Scholar
  6. 6.
    Howe, M.S.: Acoustics of Fluid–Structure Interactions. Series Cambridge Monographs on Mechanics. Cambridge University Press, Cambridge (1998)CrossRefGoogle Scholar
  7. 7.
    Corcos, M.G.: Resoluition of presure in turbulence. J. Acoust. Soc. Am. 35(2), 192–199 (1963)CrossRefGoogle Scholar
  8. 8.
    Chase, D.M.: Modeling the wavevector-frequency spectrum of turbulent boundary layer wall pressure. J. Sound Vib. 70, 29–67 (1980)CrossRefGoogle Scholar
  9. 9.
    Goody, M.C.: Empirical spectral model of surface pressure fluctuations. AIAA J. 42(9), 1788–1794 (2004)CrossRefGoogle Scholar
  10. 10.
    Mai, H., et al.: Gust response: a validation experiment and preliminary numerical simulations. In: IFASD—15th International Forum on Aeroelasticity and Structural Dynamics, June (2011)Google Scholar
  11. 11.
    Mahmoudnejad, N.: numerical computation of wall pressure fluctuations due to a turbulent boundary layer. In: 49th AIAA Aerospace Science Meeting, Orlando, Florida (2011)Google Scholar
  12. 12.
    Cunningham, P.R., White, R.G.: A review of analytical methods for aircraft structures subjected to high-intensity random acoustic loads. In: IMechE (2004)Google Scholar
  13. 13.
    Djojodihardjo, H.: Unified aerodynamic–acoustic formulation for aero-acoustic structure coupling. J. Mech. Eng. Autom. 3, 209–220 (2013)Google Scholar
  14. 14.
    Mason, W.H.: Fundamental issues in subsonic/transonic expansion corner aerodynamics. In: 31st Aerospace Science Meeting and Exhibit, AIAA Paper 93–0649, Reno (1993)Google Scholar
  15. 15.
    Chung, K.M.: Transition of subsonic and transonic expansion-corner flows. J. Aircr. 37(6), 1079–1082 (2000)CrossRefGoogle Scholar
  16. 16.
    Arianespace: VEGA User’s Manual, Issue 4 Revision 0 (2014)Google Scholar
  17. 17.
    Tam, C.K.W.: Proposed relationship between broadband shock associated noise and screech tones. J. Sound Vib. 110(2), 309–321 (1986)CrossRefGoogle Scholar
  18. 18.
    Koh, S.R., et al.: Numerical analysis of acoustic loads generated by supersonic jets. In: 7th European Conference for Aeronautics and Aerospace Sciences (EUCASS), Milan (2017)Google Scholar

Copyright information

© CEAS 2018

Authors and Affiliations

  • H. Schmidt
    • 1
  • S. Koh
    • 2
  • A. Dafnis
    • 1
  • K.-U. Schröder
    • 1
  • W. Schröder
    • 2
  1. 1.Institute of Structural Mechanics and Lightweight DesignRWTH Aachen UniversityAachenGermany
  2. 2.Chair of Fluid Mechanics and Institute of AerodynamicsRWTH Aachen UniversityAachenGermany

Personalised recommendations