ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Analysis and research of dynamic response of complex structure based on wave coupling
Received date: 2014-05-19
Revised date: 2014-11-13
Online published: 2014-12-09
Supported by
Specialized Research Fund for the Doctoral Program of Higher Education of China (priority developing area) (20126102130004)
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.
LIN Huagang , YAN Yunju , LI Pengbo . Analysis and research of dynamic response of complex structure based on wave coupling[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(5) : 1530 -1538 . DOI: 10.7527/S1000-6893.2014.0313
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