Journal article
Novel structural flexibility identification in narrow frequency bands
Smart materials and structures, v 21(12), 125020
01 Dec 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A 'Sub-PolyMAX' method is proposed in this paper not only for estimating modal parameters, but also for identifying structural flexibility by processing the impact test data in narrow frequency bands. The traditional PolyMAX method obtains denominator polynomial coefficients by minimizing the least square (LS) errors of frequency response function (FRF) estimates over the whole frequency range, but FRF peaks in different structural modes may have different levels of magnitude, which leads to the modal parameters identified for the modes with small FRF peaks being inaccurate. In contrast, the proposed Sub-PolyMAX method implements the LS solver in each subspace of the whole frequency range separately; thus the results identified from a narrow frequency band are not affected by FRF data in other frequency bands. In performing structural identification in narrow frequency bands, not in the whole frequency space, the proposed method has the following merits: (1) it produces accurate modal parameters, even for the modes with very small FRF peaks; (2) it significantly reduces computation cost by reducing the number of frequency lines and the model order in each LS implementation; (3) it accurately identifies structural flexibility from impact test data, from which structural deflection under any static load can be predicted. Numerical and laboratory examples are investigated to verify the effectiveness of the proposed method.
Metrics
Details
- Title
- Novel structural flexibility identification in narrow frequency bands
- Creators
- J. Zhang - Southeast UniversityF. L. Moon - Drexel University, Civil, Architectural, and Environmental Engineering
- Publication Details
- Smart materials and structures, v 21(12), 125020
- Publisher
- IOP Publishing Ltd
- Number of pages
- 10
- Grant note
- 51108076 / National Science Foundation of China; National Natural Science Foundation of China (NSFC) 2011BAK02B03 / Key Project of the National Twelve-Five Year Research Program of China
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000311857300020
- Scopus ID
- 2-s2.0-84870276819
- Other Identifier
- 991019168471804721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Instruments & Instrumentation
- Materials Science, Multidisciplinary