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Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method

Experimental modal analysis (EMA) with oblique excitation (i.e. oblique impact testing) is useful in improving the long test time problem of conventional EMA with normal excitation (i.e. triaxial normal impact testing), in order to extract all the important dynamic characteristics of a 3D complex st...

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Main Authors: Yee, Khoo Shin, Cheng, Lian Yee, Chao, Ong Zhi, Ismail, Zubaidah, Noroozi, Siamak
Format: Article
Published: IOP Publishing 2021
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.um.edu.my/27859/
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spelling my.um.eprints.278592022-04-01T02:21:47Z http://eprints.um.edu.my/27859/ Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method Yee, Khoo Shin Cheng, Lian Yee Chao, Ong Zhi Ismail, Zubaidah Noroozi, Siamak TA Engineering (General). Civil engineering (General) Experimental modal analysis (EMA) with oblique excitation (i.e. oblique impact testing) is useful in improving the long test time problem of conventional EMA with normal excitation (i.e. triaxial normal impact testing), in order to extract all the important dynamic characteristics of a 3D complex structure. In this study, a new methodology involving a vector projection method is introduced to find the driving point frequency response function (FRF) in the oblique direction, without the need for a special fixture with an obliquely oriented impedance head. Hence, this presents a low cost and practical solution for scaling the mode shape, as compared to the traditional approach. Moreover, the concurrent forces characteristic of oblique excitation are used in the development of the theoretical relationship between FRFs with oblique excitation and those with normal excitation. This is important for the validation of the oblique impact testing result, such as the FRF and modal parameter estimations. The experimental results show that oblique impact testing has reliable and effective results, as compared with the triaxial normal impact testing, in terms of the FRF correlation, natural frequency discrepancy, modal damping ratio error and modal assurance criterion of the unit modal mass mode shape. IOP Publishing 2021-01 Article PeerReviewed Yee, Khoo Shin and Cheng, Lian Yee and Chao, Ong Zhi and Ismail, Zubaidah and Noroozi, Siamak (2021) Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method. Measurement Science and Technology, 32 (1). ISSN 0957-0233, DOI I10.1088/1361-6501/aba969. I10.1088/1361-6501/aba969
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 TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Yee, Khoo Shin
Cheng, Lian Yee
Chao, Ong Zhi
Ismail, Zubaidah
Noroozi, Siamak
Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
description Experimental modal analysis (EMA) with oblique excitation (i.e. oblique impact testing) is useful in improving the long test time problem of conventional EMA with normal excitation (i.e. triaxial normal impact testing), in order to extract all the important dynamic characteristics of a 3D complex structure. In this study, a new methodology involving a vector projection method is introduced to find the driving point frequency response function (FRF) in the oblique direction, without the need for a special fixture with an obliquely oriented impedance head. Hence, this presents a low cost and practical solution for scaling the mode shape, as compared to the traditional approach. Moreover, the concurrent forces characteristic of oblique excitation are used in the development of the theoretical relationship between FRFs with oblique excitation and those with normal excitation. This is important for the validation of the oblique impact testing result, such as the FRF and modal parameter estimations. The experimental results show that oblique impact testing has reliable and effective results, as compared with the triaxial normal impact testing, in terms of the FRF correlation, natural frequency discrepancy, modal damping ratio error and modal assurance criterion of the unit modal mass mode shape.
format Article
author Yee, Khoo Shin
Cheng, Lian Yee
Chao, Ong Zhi
Ismail, Zubaidah
Noroozi, Siamak
author_facet Yee, Khoo Shin
Cheng, Lian Yee
Chao, Ong Zhi
Ismail, Zubaidah
Noroozi, Siamak
author_sort Yee, Khoo Shin
title Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
title_short Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
title_full Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
title_fullStr Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
title_full_unstemmed Development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
title_sort development and validation of experimental modal analysis with fixture-free oblique impact testing based on a vector projection method
publisher IOP Publishing
publishDate 2021
url http://eprints.um.edu.my/27859/
_version_ 1735409531640348672
score 13.211869

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