Resonance Analysis
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Resonance analysis (acoustic)
Fundamentals
Acoustic resonance analysis is used to detect inhomogeneities and defects (microstructural defects, inclusions, cracks) in test objects that oscillate at their resonance frequencies after external excitation (impact, shock) (see also: errors). This includes all metallic, non-metallic inorganic (glass), ceramic and brittle polymeric materials. The prerequisite is that the internal damping of the test object is not so great that a sufficiently long sound signal is available. Resonance analysis is a volume-oriented testing method which, as a ‘sound test’, is one of the oldest subjective non-destructive testing methods (NDT). In contrast, its industrial application for objective, computer-assisted acoustic analysis in series production has only been successfully introduced since the mid-1990s. The method is used, among other things, to inspect castings, sintered parts, ceramic products (pottery, roof tiles), forgings and cold or hot-formed parts, especially in industrial sectors with high production volumes, such as the automotive industry.
See also
- Non-destructive polymer testing
- Polymer diagnostics
- Acoustic emission
- Acoustic properties
- Sound emission testing
- Sound testing
Reference
- Hertlin, Ingolf: Informationsschriften zur zerstörungsfreien Prüfung – ZfP kompakt und verständlich. Volume 5: Akustische Resonanzanalyse. Castell-Verlag GmbH, Wuppertal (2003) (ISBN 978-3-934255-06-7)