Vibro-acoustic modulation for damage detection -investigation of nonlinear effects for contact-type damage.
The paper presents experimental investigation of nonlinear effects in vibro-acoustic modulation test, generated due to contact-type nonlinearity. The two samples with prepared contact surfaces were tested in experimental works. Two excitation types: low and high frequencies are introduced into...
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| Main Authors: | , |
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| Format: | Article |
| Language: | deu |
| Published: |
NDT.net
2025-03-01
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| Series: | e-Journal of Nondestructive Testing |
| Online Access: | https://www.ndt.net/search/docs.php3?id=30805 |
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| Summary: | The paper presents experimental investigation of
nonlinear effects in vibro-acoustic modulation test,
generated due to contact-type nonlinearity. The two samples
with prepared contact surfaces were tested in
experimental works. Two excitation types: low and high
frequencies are introduced into the structure via
electromagnetic shaker and piezoelectric transducer
respectively, to produce contact-related nonlinear
effects. The contact surfaces are driven to move relative
to each other in two types of motion: micro slip and
stick and slip. The motion types are classified according
to displacement values using laser vibrometer. For
given scenario the analysis of nonlinearities is performed
based on signal response. The paper focus on
investigation of both sidebands distribution around carrier
frequency and higher harmonics of low frequency
excitation.
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| ISSN: | 1435-4934 |