An interpolated FFT algorithm for full-field nonlinear modal testing with a 3D-SLDV
An interpolated FFT algorithm for full-field nonlinear modal testing with a 3D-SLDV
The measurement of full-field dynamics of a light-weighted structure can be challenging due to its low mass-to-area ratio, complex spatial deformation shapes and geometrical nonlinear behaviours under harsh loadings. In this paper, a Three-dimensional Scanning Laser Doppler Vibrometer (3D SLDV) is used to capture the full-field, multi-harmonic shapes of a vibrating blade in a laboratory environment. The wellknown disadvantages of the 3D SLDV such as its long testing duration, coarse frequency resolution and severe spectral leakage are countered by a Multi-step Interpolated Fast Fourier Transform (Multi-step IFFT) procedure in combination with a phase resonance testing strategy. A numerical example featuring ten harmonics is firstly presented, highlighting the accuracy of the proposed procedure before it is applied to the test of a wide-chord fan blade. To the best of authors’ knowledge, the full-field, multi-harmonic shapes for such an industrial large-scale, geometrically complex and nonlinear structure are experimentally measured for the first time.
2261-2274
Katholieke Universiteit Leuven
Wang, X.
d0b1d71b-69f1-4b71-ae6c-450002daeedd
Szydlowski, M.
31edc0e3-de8f-4436-94d7-bd994a1a8988
Yuan, Jie
4bcf9ce8-3af4-4009-9cd0-067521894797
Schwingshackl, C.
9d5d0411-fd2a-4438-8c25-b8b9870647f3
7 September 2020
Wang, X.
d0b1d71b-69f1-4b71-ae6c-450002daeedd
Szydlowski, M.
31edc0e3-de8f-4436-94d7-bd994a1a8988
Yuan, Jie
4bcf9ce8-3af4-4009-9cd0-067521894797
Schwingshackl, C.
9d5d0411-fd2a-4438-8c25-b8b9870647f3
Wang, X., Szydlowski, M., Yuan, Jie and Schwingshackl, C.
(2020)
An interpolated FFT algorithm for full-field nonlinear modal testing with a 3D-SLDV.
In Proceedings of the ISMA 2020 and USD 2020).
Katholieke Universiteit Leuven.
.
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Abstract
The measurement of full-field dynamics of a light-weighted structure can be challenging due to its low mass-to-area ratio, complex spatial deformation shapes and geometrical nonlinear behaviours under harsh loadings. In this paper, a Three-dimensional Scanning Laser Doppler Vibrometer (3D SLDV) is used to capture the full-field, multi-harmonic shapes of a vibrating blade in a laboratory environment. The wellknown disadvantages of the 3D SLDV such as its long testing duration, coarse frequency resolution and severe spectral leakage are countered by a Multi-step Interpolated Fast Fourier Transform (Multi-step IFFT) procedure in combination with a phase resonance testing strategy. A numerical example featuring ten harmonics is firstly presented, highlighting the accuracy of the proposed procedure before it is applied to the test of a wide-chord fan blade. To the best of authors’ knowledge, the full-field, multi-harmonic shapes for such an industrial large-scale, geometrically complex and nonlinear structure are experimentally measured for the first time.
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Published date: 7 September 2020
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Local EPrints ID: 479431
URI: http://eprints.soton.ac.uk/id/eprint/479431
PURE UUID: 321a85c3-8abc-4fe3-9d2e-0d759bd360dd
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Date deposited: 24 Jul 2023 16:39
Last modified: 17 Mar 2024 04:20
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Author:
X. Wang
Author:
M. Szydlowski
Author:
Jie Yuan
Author:
C. Schwingshackl
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