导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (5): 1530-1538.doi: 10.7527/S1000-6893.2014.0313

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

Analysis and research of dynamic response of complex structure based on wave coupling

LIN Huagang, YAN Yunju, LI Pengbo   

  1. School of Mechanics and Civil & Architecture, Northwestern Polytechnical University, Xi'an 710129, China
  • Received:2014-05-19 Revised:2014-11-13 Online:2015-05-15 Published:2014-12-09
  • Supported by:

    Specialized Research Fund for the Doctoral Program of Higher Education of China (priority developing area) (20126102130004)

Abstract:

The finite element method (FEM) is suitable for low-frequency analysis, while statistical energy analysis (SEA) method for high-frequency analysis, but a class of vibro-acoustic problem in a broad band (middle frequency) is not suitable for merely using the FEM or SEA method to solve. Taking the advantages of both FEM and SEA method, hybrid FE-SEA method based on wave coupling can predict the steady-state response of vibro-acoustic systems with a certain range of uncertainty. This article explains the theory of hybrid FE-SEA method and validates the method through two cases of Monte Carlo simulation of typical structure and the noise test of complex systems, and the energy response of the beam-plate composite structure has a good consistency with the value of Monte Carlo simulation; the vibration response of the complex aircraft's vibro-acoustic systems agrees well with test result; the error of sound pressure level (SPL) in cabin is less than 3 dB; the two cases prove the effectiveness of the hybrid FE-SEA method, and the limitations of solving complex vibro-acoustic response using the FEM or SEA method at the middle frequency are overcome.

Key words: complex built-up system, mid-frequency analysis, wave coupling, hybrid FE-SEA method, noise induced vibration

CLC Number: