Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing

This paper studies how to enhance frequency response function (FRF) estimation in the presence of harmonic disturbances during operational modal testing. A novel technique which utilizes impact-synchronous time averaging (ISTA) called impact-synchronous modal analysis (ISMA) was introduced where mod...

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Main Authors: Lim, Hong Cheet, Ong, Zhi Chao, Brandt, Anders
Format: Article
Published: Elsevier 2018
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Online Access:http://eprints.um.edu.my/21457/
https://doi.org/10.1016/j.jfranklin.2017.11.031
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spelling my.um.eprints.214572019-06-11T04:07:54Z http://eprints.um.edu.my/21457/ Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing Lim, Hong Cheet Ong, Zhi Chao Brandt, Anders TJ Mechanical engineering and machinery This paper studies how to enhance frequency response function (FRF) estimation in the presence of harmonic disturbances during operational modal testing. A novel technique which utilizes impact-synchronous time averaging (ISTA) called impact-synchronous modal analysis (ISMA) was introduced where modal analysis can be performed in the presence of ambient forces. The phase angle information of the harmonic signal at the impact events is shown to be a key factor in enhancing the effectiveness of this technique. However, lack of knowledge and control of impact with respect to the phase angle of the disturbances using conventional impact hammer in ISMA has limited the effectiveness and practicality of this novel technique. A portable and automated phase controlled impact device is introduced in the effort to eliminate non-synchronous components with minimal possible impacts applied. This device makes use of the feeding phase angle information of responses from the cyclic load back to the device and imparts the impact at the correct time/phase which is always non-synchronous with respect to the phase of response from cyclic load. A reduced number of averages thereby expedite the overall modal testing procedure, an improved of FRF estimation and a good correlation of modal extraction data with benchmark data shown in this study has highlighted the advantages of ISTA using the proposed device. Elsevier 2018 Article PeerReviewed Lim, Hong Cheet and Ong, Zhi Chao and Brandt, Anders (2018) Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing. Journal of the Franklin Institute, 355 (1). pp. 291-313. ISSN 0016-0032 https://doi.org/10.1016/j.jfranklin.2017.11.031 doi:10.1016/j.jfranklin.2017.11.031
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Lim, Hong Cheet
Ong, Zhi Chao
Brandt, Anders
Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
description This paper studies how to enhance frequency response function (FRF) estimation in the presence of harmonic disturbances during operational modal testing. A novel technique which utilizes impact-synchronous time averaging (ISTA) called impact-synchronous modal analysis (ISMA) was introduced where modal analysis can be performed in the presence of ambient forces. The phase angle information of the harmonic signal at the impact events is shown to be a key factor in enhancing the effectiveness of this technique. However, lack of knowledge and control of impact with respect to the phase angle of the disturbances using conventional impact hammer in ISMA has limited the effectiveness and practicality of this novel technique. A portable and automated phase controlled impact device is introduced in the effort to eliminate non-synchronous components with minimal possible impacts applied. This device makes use of the feeding phase angle information of responses from the cyclic load back to the device and imparts the impact at the correct time/phase which is always non-synchronous with respect to the phase of response from cyclic load. A reduced number of averages thereby expedite the overall modal testing procedure, an improved of FRF estimation and a good correlation of modal extraction data with benchmark data shown in this study has highlighted the advantages of ISTA using the proposed device.
format Article
author Lim, Hong Cheet
Ong, Zhi Chao
Brandt, Anders
author_facet Lim, Hong Cheet
Ong, Zhi Chao
Brandt, Anders
author_sort Lim, Hong Cheet
title Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
title_short Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
title_full Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
title_fullStr Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
title_full_unstemmed Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
title_sort implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing
publisher Elsevier
publishDate 2018
url http://eprints.um.edu.my/21457/
https://doi.org/10.1016/j.jfranklin.2017.11.031
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score 13.211869