Study of the effect of specimen size and frequency on the structural damping property of beam

It is said that the parameters that characterize structural damping, i.e., the loss factor, are identical to the material of the specimen, but in actuality, the damping property is sometimes affected by specimen size or the frequency. In this paper, we investigated the effect of specimen size and fr...

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Autores principales:	Shozo KAWAMURA, Masato KITA, Masami MATSUBARA, Tomohiko ISE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	structural damping modeling loss factor modal damping ratio identification size effect Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/c5c77f20ef7d4c46ada49ab88357cdb2
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spelling	oai:doaj.org-article:c5c77f20ef7d4c46ada49ab88357cdb22021-11-26T06:58:33ZStudy of the effect of specimen size and frequency on the structural damping property of beam2187-974510.1299/mej.16-00446https://doaj.org/article/c5c77f20ef7d4c46ada49ab88357cdb22016-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/6/3_16-00446/_pdf/-char/enhttps://doaj.org/toc/2187-9745It is said that the parameters that characterize structural damping, i.e., the loss factor, are identical to the material of the specimen, but in actuality, the damping property is sometimes affected by specimen size or the frequency. In this paper, we investigated the effect of specimen size and frequency on the structural damping property. First, we showed a simple identification method for modal parameters when the damping property is modeled as the structural damping. Next, we identify the modal parameters of the freely supported thin steel beam using the method. We obtain the relationship between the natural frequency and modal damping ratio for specimen with the same thickness but different length, and for specimen with the same length but different thickness. Then we identify the parameters that characterize the damping property. The results showed that the modal damping ratio was high in the lower frequency ranges, though light and constant in the higher frequency ranges, that is, the damping property depends on the frequency, so that the damping property could not be expressed only by the loss factor. And the relationship between the natural frequency and the modal damping ratio was identical for specimen with same thickness, though it is not for specimen with the different thickness, that is, the damping property depends on the thickness. We conclude that the effect of specimen size and frequency should be considered when predicting damping property in actual design processes.Shozo KAWAMURAMasato KITAMasami MATSUBARATomohiko ISEThe Japan Society of Mechanical Engineersarticlestructural dampingmodelingloss factormodal damping ratioidentificationsize effectMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 6, Pp 16-00446-16-00446 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	structural damping modeling loss factor modal damping ratio identification size effect Mechanical engineering and machinery TJ1-1570
spellingShingle	structural damping modeling loss factor modal damping ratio identification size effect Mechanical engineering and machinery TJ1-1570 Shozo KAWAMURA Masato KITA Masami MATSUBARA Tomohiko ISE Study of the effect of specimen size and frequency on the structural damping property of beam
description	It is said that the parameters that characterize structural damping, i.e., the loss factor, are identical to the material of the specimen, but in actuality, the damping property is sometimes affected by specimen size or the frequency. In this paper, we investigated the effect of specimen size and frequency on the structural damping property. First, we showed a simple identification method for modal parameters when the damping property is modeled as the structural damping. Next, we identify the modal parameters of the freely supported thin steel beam using the method. We obtain the relationship between the natural frequency and modal damping ratio for specimen with the same thickness but different length, and for specimen with the same length but different thickness. Then we identify the parameters that characterize the damping property. The results showed that the modal damping ratio was high in the lower frequency ranges, though light and constant in the higher frequency ranges, that is, the damping property depends on the frequency, so that the damping property could not be expressed only by the loss factor. And the relationship between the natural frequency and the modal damping ratio was identical for specimen with same thickness, though it is not for specimen with the different thickness, that is, the damping property depends on the thickness. We conclude that the effect of specimen size and frequency should be considered when predicting damping property in actual design processes.
format	article
author	Shozo KAWAMURA Masato KITA Masami MATSUBARA Tomohiko ISE
author_facet	Shozo KAWAMURA Masato KITA Masami MATSUBARA Tomohiko ISE
author_sort	Shozo KAWAMURA
title	Study of the effect of specimen size and frequency on the structural damping property of beam
title_short	Study of the effect of specimen size and frequency on the structural damping property of beam
title_full	Study of the effect of specimen size and frequency on the structural damping property of beam
title_fullStr	Study of the effect of specimen size and frequency on the structural damping property of beam
title_full_unstemmed	Study of the effect of specimen size and frequency on the structural damping property of beam
title_sort	study of the effect of specimen size and frequency on the structural damping property of beam
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/c5c77f20ef7d4c46ada49ab88357cdb2
work_keys_str_mv	AT shozokawamura studyoftheeffectofspecimensizeandfrequencyonthestructuraldampingpropertyofbeam AT masatokita studyoftheeffectofspecimensizeandfrequencyonthestructuraldampingpropertyofbeam AT masamimatsubara studyoftheeffectofspecimensizeandfrequencyonthestructuraldampingpropertyofbeam AT tomohikoise studyoftheeffectofspecimensizeandfrequencyonthestructuraldampingpropertyofbeam
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Study of the effect of specimen size and frequency on the structural damping property of beam

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