Affiliations: KOMPSAT-5 System Engineering and Integration Team,
Korea Aerospace Research Institute, Daejeon, Korea | Department of Aerospace Engineering, Korea Advanced
Institute of Science and Technology, Daejeon, Korea
Note: [] Corresponding author: Jae-Hung Han, Department of Aerospace
Engineering, Korea Advanced Institute of Science and Technology, Daejeon
305-701, Korea. Tel.: +82 42 350 3723; Fax: +82 42 350 3710; E-mail: [email protected]
Abstract: Shock induced vibration can be more crucial in the mid frequency
range where the dynamic couplings with structural parts and components play
important roles. To estimate the behavior of structures in this frequency range
where conventional analytical schemes, such as statistical energy analysis
(SEA) and finite element analysis (FEA) methods may become inaccurate, many
alternative methodologies have been tried up to date. This study presents an
effective and practical method to accurately predict transient responses in the
mid frequency range without having to resort to the large computational
efforts. Specifically, the present study employs the more realistic frequency
response functions (FRFs) from the energy flow method (EFM) which is a hybrid
method combining the pseudo SEA equation (or SEA-Like equation) and modal
information obtained by the finite element analysis (FEA). Furthermore, to
obtain the time responses synthesized with modal characteristics, a time domain
correction is practiced with the input force signal and the reference FRF on a
position of the response subsystem. A numerical simulation is performed for a
simple five plate model to show its suitability and effectiveness over the
standard analytical schemes.
Keywords: Vibro-acoustic, mid frequency, shock response, finite element analysis (FEA), shock response spectrum (SRS), statistical energy analysis (SEA), energy flow method (EFM), virtual modal synthesis and simulation (VMSS), time domain correction
