| Title |
Estimation of Physical Parameters from Frequency Response Function Data |
| Authors |
홍유식(Hong, Yu-Sik) ; 은희창(Eun, Hee-Chang) ; 송준혁(Song, Jun-Hyuk) ; 안재형(An, Jae-Hyoung) |
| DOI |
https://doi.org/10.5659/JAIK.2022.38.5.177 |
| Keywords |
nondestructive test; system identification; fundamental vibration mode; frequency response function; measurement; sensor |
| Abstract |
The structure is deteriorated by various factors such as environmental effect and unexpected overloading. The structural performance in
service is evaluated by various non-destructive tests and structural analysis. This study proposes an empirical method to predict physical
parameters of structural member in the frequency domain. The method utilizes the frequency response function (FRF) data measured and
collected by an impact hammer test assuming the fundamental vibration mode of the member. The validity of the proposed method is
illustrated in two analytical examples and two experimental works. It is found that the physical parameters of beam member should be
modified by correction factor predicted by the boundary conditions and wavelength of the fundamental mode. And it is observed that the
parameters can be optimally predicted in taking the FRF data prior to the frequency that is directly outside the first resonance frequency.
The results demonstrate that the physical parameters can be estimated very closely by the proposed method. |