Journal ArticleDOI
Modified SSTD method to account for harmonic excitations during operational modal analysis
TLDR
In this paper, a modified Single Station Time Domain (SSTD) method is proposed, which can be applied to include the effect of purely harmonic vibrations, assuming the harmonic frequencies are known a priori.About:
This article is published in Mechanism and Machine Theory.The article was published on 2004-12-01. It has received 38 citations till now. The article focuses on the topics: Operational Modal Analysis & Modal testing.read more
Citations
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Journal ArticleDOI
Vertical axis wind turbine-a review of various configurations and design techniques
Muhammad Mahmood Aslam Bhutta,Nasir Hayat,Ahmed Uzair Farooq,Zain Ali,Sh. Rehan Jamil,Zahid Hussain +5 more
TL;DR: In this article, the authors reviewed various configurations of VAWT along with their merits and demerits and found that coefficient of power for various configurations is different and can be optimized with reference to Tip Speed Ratio.
Journal ArticleDOI
Operational modal analysis of a 2.5 MW wind turbine using optical measurement techniques and strain gauges
Muammer Ozbek,Daniel J. Rixen +1 more
TL;DR: In this article, the results of in-flight tests performed on a 2.5 MW, 80 m diameter wind turbine were analyzed by using an operational modal analysis algorithm based on the least square complex exponential method and several turbine parameters (eigenfrequencies and damping ratios).
Journal ArticleDOI
Structural vibration monitoring and operational modal analysis of offshore wind turbine structure
TL;DR: The researches on the structural vibration characteristics and operational modal analysis of offshore wind turbine not only provide powerful data and technology support for the operation safety evaluation, but also provide the necessary theoretical and practical bases for the design and maintenance of wind turbine structures.
Journal ArticleDOI
Challenges in testing and monitoring the in-operation vibration characteristics of wind turbines
TL;DR: In this paper, the main challenges in analyzing the dynamic properties of wind turbines, possible reasons of the uncertainty in the estimated modal parameters and the applicability limits of the utilized identification algorithms are discussed based on the results of these investigations.
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Operational modal analysis by updating autoregressive model
TL;DR: In this article, a new noise rate-based factor called the Noise rate Order Factor (NOF) is introduced for use in the effective selection of model order and noise rate estimation.
References
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Journal ArticleDOI
An eigensystem realization algorithm for modal parameter identification and model reduction
Jer-Nan Juang,Richard S. Pappa +1 more
TL;DR: A new approach is introduced in conjunction with the singular value decomposition technique to derive the basic formulation of minimum order realization which is an extended version of the Ho-Kalman algorithm.
The Natural Excitation Technique (NExT) for modal parameter extraction from operating wind turbines
TL;DR: The Natural Excitation Technique (NExT) is a method of modal testing that allows structures to be tested in their ambient environments as mentioned in this paper, and has been used extensively in the literature.
A method for the direct identification of vibration parameters from the free response
S. R. Ibrahim,E. C. Mikulcik +1 more
Journal ArticleDOI
Operational modal analysis in the presence of harmonic excitation
TL;DR: In this paper, a modification of the least-square complex exponential identification procedure is proposed to include explicitly the harmonic component of the input to identify the modal parameters of a beam structure.