eprintid: 856
rev_number: 8
eprint_status: archive
userid: 5
dir: disk0/00/00/08/56
datestamp: 2015-12-04 04:26:44
lastmod: 2015-12-04 04:29:51
status_changed: 2015-12-04 04:26:44
type: article
metadata_visibility: show
creators_name: Le, Thai Hoa
creators_name: Tamura, Yukio
creators_name: Matsumoto, Masaru
creators_name: Shirato, Hiromichi
title: Understanding of Unsteady Pressure Fields on Prisms based on Covariance and Spectral Proper Orthogonal Decompositions
ispublished: pub
subjects: Mechanics
divisions: fac_fema
abstract: 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.
date: 2013-05
date_type: published
official_url: http://dx.doi.org/10.12989/was.2013.16.5.517
full_text_status: none
publication: Wind and Structures An International Journal
volume: 16
number: 5
pagerange: 517-540
refereed: TRUE
issn: 1226-6116
citation:   Le, Thai Hoa and Tamura, Yukio and Matsumoto, Masaru and Shirato, Hiromichi  (2013) Understanding of Unsteady Pressure Fields on Prisms based on Covariance and Spectral Proper Orthogonal Decompositions.  Wind and Structures An International Journal, 16  (5).   pp. 517-540.  ISSN 1226-6116