Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)

We investigated the damping mechanism of granular material dampers when using a structure with a relatively high natural frequency and small vibration displacement as the target of vibration damping. For powder or granular material dampers, the movement of the powder or granular material is the basi...

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Main Authors: Tomoko KOGA, Taichi SATO
Format: Article
Language:Japanese
Published: The Japan Society of Mechanical Engineers 2023-11-01
Series:Nihon Kikai Gakkai ronbunshu
Subjects:
Online Access:https://www.jstage.jst.go.jp/article/transjsme/89/928/89_23-00137/_pdf/-char/en
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author Tomoko KOGA
Taichi SATO
author_facet Tomoko KOGA
Taichi SATO
author_sort Tomoko KOGA
collection DOAJ
description We investigated the damping mechanism of granular material dampers when using a structure with a relatively high natural frequency and small vibration displacement as the target of vibration damping. For powder or granular material dampers, the movement of the powder or granular material is the basic principle of damping. Damping ratios were calculated and compared by individually modifying each parameter (other than diameter) that affects the granule’s motion. As a result, it was found that when the moment of inertia of the granules is 1/2 and the Young's modulus is 1/100 of steel, the damping effect is improved in the region where the total body weight is heavy. In addition, as a specific example of reducing the moment of inertia and optimizing Young’s modulus, when the effect was examined by calculation and experiment using rubber ball with steel core, it was found that the damping ratio can be improved in the region where the total mass of the granules is large. Furthermore, we obtained new knowledge that the hardening spring characteristics of rubber balls containing steel balls have a positive effect on damping characteristics.
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spelling doaj.art-248a3aa8f7af426fbe1e34d108ea5b172023-12-26T00:20:42ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612023-11-018992823-0013723-0013710.1299/transjsme.23-00137transjsmeDamping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)Tomoko KOGA0Taichi SATO1School of Engineering, Tokyo Denki UniversitySchool of Engineering, Tokyo Denki UniversityWe investigated the damping mechanism of granular material dampers when using a structure with a relatively high natural frequency and small vibration displacement as the target of vibration damping. For powder or granular material dampers, the movement of the powder or granular material is the basic principle of damping. Damping ratios were calculated and compared by individually modifying each parameter (other than diameter) that affects the granule’s motion. As a result, it was found that when the moment of inertia of the granules is 1/2 and the Young's modulus is 1/100 of steel, the damping effect is improved in the region where the total body weight is heavy. In addition, as a specific example of reducing the moment of inertia and optimizing Young’s modulus, when the effect was examined by calculation and experiment using rubber ball with steel core, it was found that the damping ratio can be improved in the region where the total mass of the granules is large. Furthermore, we obtained new knowledge that the hardening spring characteristics of rubber balls containing steel balls have a positive effect on damping characteristics.https://www.jstage.jst.go.jp/article/transjsme/89/928/89_23-00137/_pdf/-char/endampergranular materialssingle degree of freedom systemdamping ratiocollision forcefrictional force
spellingShingle Tomoko KOGA
Taichi SATO
Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)
Nihon Kikai Gakkai ronbunshu
damper
granular materials
single degree of freedom system
damping ratio
collision force
frictional force
title Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)
title_full Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)
title_fullStr Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)
title_full_unstemmed Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)
title_short Damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency (Study for high damping)
title_sort damping mechanisms of vibration reduction system with granular materials for vibration system with high natural frequency study for high damping
topic damper
granular materials
single degree of freedom system
damping ratio
collision force
frictional force
url https://www.jstage.jst.go.jp/article/transjsme/89/928/89_23-00137/_pdf/-char/en
work_keys_str_mv AT tomokokoga dampingmechanismsofvibrationreductionsystemwithgranularmaterialsforvibrationsystemwithhighnaturalfrequencystudyforhighdamping
AT taichisato dampingmechanismsofvibrationreductionsystemwithgranularmaterialsforvibrationsystemwithhighnaturalfrequencystudyforhighdamping