In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3906-3906
Abstract:
Wind power plants, and in particular their blades, have to withstand significant environmental stresses. Regular testing of the blades’ structural integrity is essential to ensure a lifetime of fifteen to twenty years. Such testing is performed by experienced engineers with a tap test, which is a fast and robust non-destructive technique. By tapping on the shell of the blade and listening to the emitted sound, engineers can assess potential defects in the composite material. This work aims at identifying acoustic features that enable an automated algorithm to perform a tap test. Ten engineers familiar with the inspection of blades participated in a listening experiment in which audible differences between tap test recordings from intact and defective material were rated using a set of defined adjectives. As a result, acoustic features, such as statistical moments of the spectrum, could be correlated with defect-indicating responses. For a more detailed acoustic assessment, further acoustic features were associated with different types of defects and the effect of bearing on the acoustic profile (full blade vs. cut-out) was investigated. Consequently, an informed algorithm incorporating the knowledge of inspectors will be proposed to support the automated determination of defects in blades of wind power plants.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2017
detail.hit.zdb_id:
1461063-2
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