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On-line Access: 2024-08-27
Received: 2023-10-17
Revision Accepted: 2024-05-08
Crosschecked: 2018-05-09
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Automated impact device with non-synchronous impacts: a practical solution for modal testing during operation
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Zhi Chao Ong, Hong Cheet Lim, Anders Brandt. Automated impact device with non-synchronous impacts: a practical solution for modal testing during operation[J]. Journal of Zhejiang University Science A, 2018, 19(6): 452-460.
@article{title="Automated impact device with non-synchronous impacts: a practical solution for modal testing during operation",
author="Zhi Chao Ong, Hong Cheet Lim, Anders Brandt",
journal="Journal of Zhejiang University Science A",
volume="19",
number="6",
pages="452-460",
year="2018",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1700431"
}
%0 Journal Article
%T Automated impact device with non-synchronous impacts: a practical solution for modal testing during operation
%A Zhi Chao Ong
%A Hong Cheet Lim
%A Anders Brandt
%J Journal of Zhejiang University SCIENCE A
%V 19
%N 6
%P 452-460
%@ 1673-565X
%D 2018
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1700431
TY - JOUR
T1 - Automated impact device with non-synchronous impacts: a practical solution for modal testing during operation
A1 - Zhi Chao Ong
A1 - Hong Cheet Lim
A1 - Anders Brandt
J0 - Journal of Zhejiang University Science A
VL - 19
IS - 6
SP - 452
EP - 460
%@ 1673-565X
Y1 - 2018
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1700431
Abstract: Previous study has shown that synchronization of phases between impacts and the cyclic load component should be avoided to improve the effectiveness of operational modal testing, i.e. impact-synchronous modal analysis in obtaining a cleaner frequency response function (FRF) estimation with fewer number of averages. However, avoiding the phase synchronization effect is rarely achievable with the current manual impact hammer because of the lack of control of the impact timing. We investigate how to improve FRF estimation in the presence of harmonic disturbances, such as those present in operating rotating machines. An auto impact device is therefore introduced to replace the manual impact hammer. This device ensures that impact intervals can be applied at non-synchronous instances with respect to the harmonic disturbance. We demonstrate that this new device is a viable option for operational modal testing. It allows significant improvement in FRF estimation and shows good correlation of modal extraction data with benchmark experimental modal analysis results.
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