Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations

Contact-type failures, such as early-stage fatigue cracks, bolt loosening, and welding cracks, are difficult to detect with nondestructive inspection, which uses ultrasonic waves or vibrations. When a structure experiencing contact-type failure vibrates due to ultrasonic vibrations of two different...

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Autores principales:	Takashi TANAKA, Junnosuke ASANO, Yasunori OURA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	detection localization contact-type failure ultrasonic vibration frequency down-conversion structural intensity Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/823e053524bb4229969d8a9a9ac9b98d
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spelling	oai:doaj.org-article:823e053524bb4229969d8a9a9ac9b98d2021-11-09T00:01:15ZLocalization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations2187-974510.1299/mej.21-00201https://doaj.org/article/823e053524bb4229969d8a9a9ac9b98d2021-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/5/8_21-00201/_pdf/-char/enhttps://doaj.org/toc/2187-9745Contact-type failures, such as early-stage fatigue cracks, bolt loosening, and welding cracks, are difficult to detect with nondestructive inspection, which uses ultrasonic waves or vibrations. When a structure experiencing contact-type failure vibrates due to ultrasonic vibrations of two different frequencies, low-frequency vibrations with frequencies equal to the difference between the frequencies of the ultrasonic vibrations are generated due to local nonlinearity at the contact interface (frequency down-conversion). The detection methods of contact-type failure based on the frequency down-conversion of elastic waves or vibrations have been proposed. These detection methods can be applied using measurements with low-sampling rates. This study aims to develop a detection and localization method based on the frequency down-conversion of elastic vibrations. Low-frequency vibrations caused by frequency down-conversion are generated only if the structure has contact-type failure. Accordingly, contact-type failure can be regarded as the excitation point of low-frequency vibration caused by frequency down-conversion. Herein, a localization method of contact-type failure using the structural intensity as the localization method of the exciting location was proposed. First, an overview of the frequency down-conversion phenomenon is mentioned. Second, the theoretical investigation of the proposed localization method is explained, and the parametric excitation model that uses the Euler-Bernoulli beam is suggested. The equation transformation of the proposed model clarifies that the contact-type failure can be regarded as the exciting point of low-frequency vibration. Furthermore, from the results obtained herein, the location of contact-type failure was identified as the exciting point of low-frequency vibration caused by the frequency down-conversion. Finally, the basic performance of the proposed localization method was experimentally investigated. The exciting point can be localized from the sign change point of the structural intensity. Thus, the sign change point of the structural intensity of low-frequency vibrations caused by the frequency down-conversion is the contact-type failure location.Takashi TANAKAJunnosuke ASANOYasunori OURAThe Japan Society of Mechanical Engineersarticledetectionlocalizationcontact-type failureultrasonic vibrationfrequency down-conversionstructural intensityMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 5, Pp 21-00201-21-00201 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	detection localization contact-type failure ultrasonic vibration frequency down-conversion structural intensity Mechanical engineering and machinery TJ1-1570
spellingShingle	detection localization contact-type failure ultrasonic vibration frequency down-conversion structural intensity Mechanical engineering and machinery TJ1-1570 Takashi TANAKA Junnosuke ASANO Yasunori OURA Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
description	Contact-type failures, such as early-stage fatigue cracks, bolt loosening, and welding cracks, are difficult to detect with nondestructive inspection, which uses ultrasonic waves or vibrations. When a structure experiencing contact-type failure vibrates due to ultrasonic vibrations of two different frequencies, low-frequency vibrations with frequencies equal to the difference between the frequencies of the ultrasonic vibrations are generated due to local nonlinearity at the contact interface (frequency down-conversion). The detection methods of contact-type failure based on the frequency down-conversion of elastic waves or vibrations have been proposed. These detection methods can be applied using measurements with low-sampling rates. This study aims to develop a detection and localization method based on the frequency down-conversion of elastic vibrations. Low-frequency vibrations caused by frequency down-conversion are generated only if the structure has contact-type failure. Accordingly, contact-type failure can be regarded as the excitation point of low-frequency vibration caused by frequency down-conversion. Herein, a localization method of contact-type failure using the structural intensity as the localization method of the exciting location was proposed. First, an overview of the frequency down-conversion phenomenon is mentioned. Second, the theoretical investigation of the proposed localization method is explained, and the parametric excitation model that uses the Euler-Bernoulli beam is suggested. The equation transformation of the proposed model clarifies that the contact-type failure can be regarded as the exciting point of low-frequency vibration. Furthermore, from the results obtained herein, the location of contact-type failure was identified as the exciting point of low-frequency vibration caused by the frequency down-conversion. Finally, the basic performance of the proposed localization method was experimentally investigated. The exciting point can be localized from the sign change point of the structural intensity. Thus, the sign change point of the structural intensity of low-frequency vibrations caused by the frequency down-conversion is the contact-type failure location.
format	article
author	Takashi TANAKA Junnosuke ASANO Yasunori OURA
author_facet	Takashi TANAKA Junnosuke ASANO Yasunori OURA
author_sort	Takashi TANAKA
title	Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
title_short	Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
title_full	Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
title_fullStr	Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
title_full_unstemmed	Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
title_sort	localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/823e053524bb4229969d8a9a9ac9b98d
work_keys_str_mv	AT takashitanaka localizationmethodofcontacttypefailurebymeasuringthestructuralintensityoflowfrequencyvibrationscausedbyfrequencydownconversionofelasticvibrations AT junnosukeasano localizationmethodofcontacttypefailurebymeasuringthestructuralintensityoflowfrequencyvibrationscausedbyfrequencydownconversionofelasticvibrations AT yasunorioura localizationmethodofcontacttypefailurebymeasuringthestructuralintensityoflowfrequencyvibrationscausedbyfrequencydownconversionofelasticvibrations
_version_	1718441395978502144

Localization method of contact-type failure by measuring the structural intensity of low-frequency vibrations caused by frequency down-conversion of elastic vibrations

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