An inconsistent phase selection assessment for harmonic peaks elimination in operational modal testing

Ong, Zhi Chao and Lim, Hong Cheet and Brandt, Anders and Ismail, Zubaidah and Khoo, Shin Yee (2019) An inconsistent phase selection assessment for harmonic peaks elimination in operational modal testing. Archive of Applied Mechanics, 89 (12). pp. 2415-2430. ISSN 0939-1533, DOI

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An improvement on modal analysis technique is always exacerbated by the limitation on both operational modal analysis (OMA) and experimental modal analysis (EMA). In a recent year, a novel method was introduced named impact-synchronous modal analysis (ISMA) which represents a magnificent achievement in this field. The efficiency of this method as a viable option for EMA and OMA is proven in previous research. However, a quick and straightforward real-time ISMA method is desired as the current procedure is labour-intensive and time-consuming due to the lack of control on the impact timing with respect to phase angle of the disturbances. Thus, the aim of this paper is to identify the significance of phase difference information between acceleration response and cyclic load component in eliminating the disturbances through impact-synchronous time averaging. The paper presented a phase selection assessment, and the results showed that a few averages, (i.e. four averages) are sufficient to filter out the disturbances by 72–80% of dominant periodic response due to cyclic load and over 50% reduction for second harmonic, when the phase angles with respect to the impact are inconsistent for each impact applied. A better modal identification result is obtained through a straightforward way of eliminating the periodic response. Thus, the estimated frequency response function is strongly enhanced and good correlation is observed between modal extraction data and benchmark EMA result. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

Item Type: Article
Funders: Fundamental Research Grant Scheme (FP010-2014A), Postgraduate Research Grant (PG011-2015A), Advanced Shock and Vibration Research (ASVR) Group of University of Malaya and other project collaborators
Uncontrolled Keywords: Frequency response function; Harmonics; Impact-synchronous modal analysis; Impact-synchronous time averaging; Periodic response; Phase synchronization
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 14 Feb 2020 02:55
Last Modified: 14 Feb 2020 02:55

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