Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass
Recently, one of the authors proposed a multi-modal and multi-axis vibration reduction device against elastic vibrations of structures. The device is called eMDVA (embedded Mass Dynamic Vibration Absorber). The eMDVA consists of a ball-like mass embedded in a spherical viscoelastic material. Therefo...
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2022-04-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/88/910/88_22-00018/_pdf/-char/en |
| _version_ | 1811225107913244672 |
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| author | Hikaru ISHIZAWA Takahiro TOMIOKA |
| author_facet | Hikaru ISHIZAWA Takahiro TOMIOKA |
| author_sort | Hikaru ISHIZAWA |
| collection | DOAJ |
| description | Recently, one of the authors proposed a multi-modal and multi-axis vibration reduction device against elastic vibrations of structures. The device is called eMDVA (embedded Mass Dynamic Vibration Absorber). The eMDVA consists of a ball-like mass embedded in a spherical viscoelastic material. Therefore the embedded mass can vibrate in every direction in the viscoelastic medium. The vibration characteristics of the eMDVA are investigated experimentally and numerically in this paper. Three eMDVAs with different sizes of spherical viscoelastic material containing a ball-like mass with a triaxial acceleration pickup are made, and vibration measurement tests are conducted. The measurement results show that the frequency response function (FRF) of the acceleration of the embedded mass versus excitation force has a single dominant peak. The peak frequency can be changed according to the size of the viscoelastic sphere. A finite element (FE) model of the eMDVA is developed, and investigations to determine the viscoelastic properties as Prony series expression are carried out. It has been shown that the ordinary procedure to adjust the Prony coefficients to fit the complex Young's modulus obtained by a dynamic mechanical analysis (DMA) leads to less accuracy in calculating FRF. On the other hand, good agreement between numerical and measurement results can be achieved by directly adjusting the coefficients to fit the FRF curves. In addition, FRF curves of the eMDVAs having non-spherical shaped viscoelastic material are calculated using the FE model with the viscoelastic properties mentioned above. The FE analyses have shown that by changing the shape of the viscoelastic material from sphere to spheroid or ellipsoid, the FRF has a different peak frequency according to the vibration direction. |
| first_indexed | 2024-04-12T09:00:14Z |
| format | Article |
| id | doaj.art-0c1af5fc0d3840cd893478ad8fa2023e |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T09:00:14Z |
| publishDate | 2022-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-0c1af5fc0d3840cd893478ad8fa2023e2022-12-22T03:39:15ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612022-04-018891022-0001822-0001810.1299/transjsme.22-00018transjsmeVibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like massHikaru ISHIZAWA0Takahiro TOMIOKA1Graduate School of Akita Prefectural UniversityFaculty of Systems Science and Technology, Akita Prefectural UniversityRecently, one of the authors proposed a multi-modal and multi-axis vibration reduction device against elastic vibrations of structures. The device is called eMDVA (embedded Mass Dynamic Vibration Absorber). The eMDVA consists of a ball-like mass embedded in a spherical viscoelastic material. Therefore the embedded mass can vibrate in every direction in the viscoelastic medium. The vibration characteristics of the eMDVA are investigated experimentally and numerically in this paper. Three eMDVAs with different sizes of spherical viscoelastic material containing a ball-like mass with a triaxial acceleration pickup are made, and vibration measurement tests are conducted. The measurement results show that the frequency response function (FRF) of the acceleration of the embedded mass versus excitation force has a single dominant peak. The peak frequency can be changed according to the size of the viscoelastic sphere. A finite element (FE) model of the eMDVA is developed, and investigations to determine the viscoelastic properties as Prony series expression are carried out. It has been shown that the ordinary procedure to adjust the Prony coefficients to fit the complex Young's modulus obtained by a dynamic mechanical analysis (DMA) leads to less accuracy in calculating FRF. On the other hand, good agreement between numerical and measurement results can be achieved by directly adjusting the coefficients to fit the FRF curves. In addition, FRF curves of the eMDVAs having non-spherical shaped viscoelastic material are calculated using the FE model with the viscoelastic properties mentioned above. The FE analyses have shown that by changing the shape of the viscoelastic material from sphere to spheroid or ellipsoid, the FRF has a different peak frequency according to the vibration direction.https://www.jstage.jst.go.jp/article/transjsme/88/910/88_22-00018/_pdf/-char/endynamic vibration absorbermulti-axis dampingmulti-directional vibration absorberviscoelatic materialfinite element analysis |
| spellingShingle | Hikaru ISHIZAWA Takahiro TOMIOKA Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass Nihon Kikai Gakkai ronbunshu dynamic vibration absorber multi-axis damping multi-directional vibration absorber viscoelatic material finite element analysis |
| title | Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass |
| title_full | Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass |
| title_fullStr | Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass |
| title_full_unstemmed | Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass |
| title_short | Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass |
| title_sort | vibration characteristic design of a multi modal and multi axis dynamic vibration absorber consists of viscoelastic material containing embedded ball like mass |
| topic | dynamic vibration absorber multi-axis damping multi-directional vibration absorber viscoelatic material finite element analysis |
| url | https://www.jstage.jst.go.jp/article/transjsme/88/910/88_22-00018/_pdf/-char/en |
| work_keys_str_mv | AT hikaruishizawa vibrationcharacteristicdesignofamultimodalandmultiaxisdynamicvibrationabsorberconsistsofviscoelasticmaterialcontainingembeddedballlikemass AT takahirotomioka vibrationcharacteristicdesignofamultimodalandmultiaxisdynamicvibrationabsorberconsistsofviscoelasticmaterialcontainingembeddedballlikemass |