By using ambient vibration, a new approach based on
improvement and correction of system characteristic matrix in modal vibration
is provided. The result is that actual system characteristic matrices are
accurately made such that the error is minimized at great extent. This clearly
shows how the system parameters can be updated in a more reliable way. Firstly,
by approximation, the actual system characteristic matrices are determined
using the singular value decomposition of block Hankel matrix that is built
from response correlation matrix. Secondly, by black-box modeling
approximation, the input-output relation of the system through Kalman theory is
made in order to make the system characteristic matrices optimal definite.
Furthermore, by expressing Hankel matrix’s multiplicities from Eigen solution
of the system state matrix obtained in previous iteration, it is possible to
determine both the covariance of non-measurable process noise and measurement
noise matrixes which are present in the Riccati equation. This means that both
measurement and process covariance noises’ matrixes are indirectly built only
from measured out-put data. The repetition of iterations is done until the
error is sufficiently minimized. And then system modal parameters are extracted
from these obtained system characteristic matrices. This system is used for
modal update of the system in which modal parameters are applied directly and
iterative methods. The code supporting this algorithm can be interfaced with
the codes of the finite elements.
: Dynamic Parameters Ambient Vibration System Identification
Birincil Dil | İngilizce |
---|---|
Konular | İnşaat Mühendisliği |
Bölüm | İnşaat Mühendisliği |
Yazarlar | |
Yayımlanma Tarihi | 30 Mart 2018 |
Gönderilme Tarihi | 18 Ekim 2017 |
Yayımlandığı Sayı | Yıl 2018 |