TY  - JOUR
ID  - SisLab856
UR  - http://dx.doi.org/10.12989/was.2013.16.5.517
IS  - 5
A1  - Le, Thai Hoa
A1  - Tamura, Yukio
A1  - Matsumoto, Masaru
A1  - Shirato, Hiromichi
Y1  - 2013/05//
N2  - This paper presents applications of proper orthogonal decomposition in both the time and frequency domains based on both cross spectral matrix and covariance matrix branches to analyze multi-variate unsteady pressure fields on prisms and to study spanwise and chordwise pressure distribution. Furthermore, modification of proper orthogonal decomposition is applied to a rectangular spanwise coherence matrix in order to investigate the spanwise correlation and coherence of the unsteady pressure fields. The unsteady pressure fields have been directly measured in wind tunnel tests on some typical prisms with slenderness ratios B/D=1, B/D=1 with a splitter plate in the wake, and B/D=5. Significance and contribution of the first covariance mode associated with the first principal coordinates as well as those of the first spectral eigenvalue and associated spectral mode are clarified by synthesis of the unsteady pressure fields and identification of intrinsic events inside the unsteady pressure fields. Spanwise coherence of the unsteady pressure fields has been mapped the first time ever for better understanding of their intrinsic characteristics.
JF  - Wind and Structures An International Journal
VL  - 16
SN  - 1226-6116
TI  - Understanding of Unsteady Pressure Fields on Prisms based on Covariance and Spectral Proper Orthogonal Decompositions
SP  - 517
AV  - none
EP  - 540
ER  -