MORPHOLOGICAL PROCESSING OF PROPER ORTHOGONAL MODES FOR CRACK DETECTION IN BEAM STRUCTURES

Gryllias, KC; Koukoulis, IN; Yiakopoulos, CT; Antoniadis, IA; Provatidis, CG

dc.contributor.author	Gryllias, KC	en
dc.contributor.author	Koukoulis, IN	en
dc.contributor.author	Yiakopoulos, CT	en
dc.contributor.author	Antoniadis, IA	en
dc.contributor.author	Provatidis, CG	en
dc.date.accessioned	2014-03-01T01:31:15Z
dc.date.available	2014-03-01T01:31:15Z
dc.date.issued	2009	en
dc.identifier.issn	1559-3959	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19760
dc.subject	vibration analysis	en
dc.subject	crack detection	en
dc.subject	proper orthogonal decomposition	en
dc.subject	morphological processing	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Mechanics	en
dc.subject.other	WAVELET ANALYSIS	en
dc.subject.other	EXPERIMENTAL VALIDATION	en
dc.subject.other	DAMAGE IDENTIFICATION	en
dc.subject.other	NATURAL FREQUENCIES	en
dc.subject.other	BREATHING CRACK	en
dc.subject.other	CANTILEVER BEAM	en
dc.subject.other	VIBRATION	en
dc.subject.other	DECOMPOSITION	en
dc.subject.other	TRANSFORM	en
dc.subject.other	LOCATION	en
dc.title	MORPHOLOGICAL PROCESSING OF PROPER ORTHOGONAL MODES FOR CRACK DETECTION IN BEAM STRUCTURES	en
heal.type	journalArticle	en
heal.identifier.primary	10.2140/jomms.2009.4.1063	en
heal.identifier.secondary	http://dx.doi.org/10.2140/jomms.2009.4.1063	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	A two-step approach for crack detection in beam structures is presented. As a first step, a number of proper orthogonal modes (POMs) of a beam are extracted, using proper orthogonal decomposition, a powerful and elegant method (closely related to principal component analysis) aimed at obtaining low-dimensional approximations of high-dimensional processes, taking into account nonlinearities and minimizing noise effects. Then, alternatively to other approaches, morphological processing is proposed for the further processing of the POMs. The basic concept of morphological processing is to modify the shape of an object by transforming it through its interaction with another object, called the structuring element. Using an appropriate morphological processing procedure, the position and the depth of the cracks can be estimated by isolating the sudden local change effect of the cracks on the spatial variation of the shape of each POM. For this purpose, the four basic morphological operators (dilation, erosion, opening, closing) are compared, using two different types of structuring elements. The erosion operator with a spline structuring element is shown to present the best results. Finally, the performance of the method is assessed on different beam structures affected by breathing cracks, with respect to the influence of several factors, such as boundary conditions, crack location, crack depth, crack distance, measurement noise level and space resolution of measurement points. In all cases, the method presents a robust behavior.	en
heal.publisher	MATHEMATICAL SCIENCE PUBL	en
heal.journalName	JOURNAL OF MECHANICS OF MATERIALS AND STRUCTURES	en
dc.identifier.doi	10.2140/jomms.2009.4.1063	en
dc.identifier.isi	ISI:000270727800005	en
dc.identifier.volume	4	en
dc.identifier.issue	6	en
dc.identifier.spage	1063	en
dc.identifier.epage	1088	en