Khoo, Shin Yee and Lian, Yee Cheng and Ong, Zhi Chao and Ismail, Zubaidah and Noroozi, Siamak (2020) 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). 015002. ISSN 0957-0233, DOI https://doi.org/10.1088/1361-6501/aba969.
Full text not available from this repository.Abstract
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. © 2020 IOP Publishing Ltd.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | concurrent forces effect; oblique driving point measurement; oblique frequency response function; oblique impact testing; triaxial normal impact testing; vector projection method |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 30 Apr 2021 00:36 |
| Last Modified: | 30 Apr 2021 00:36 |
| URI: | http://eprints.um.edu.my/id/eprint/25904 |
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