Design of an adaptive - passive dynamic vibration absorber composed of a string - mass system equipped with negative stiffness tension adjusting mechanism
| dc.contributor | Graduate Program in Mechanical Engineering. | |
| dc.contributor.advisor | Yılmaz, Çetin. | |
| dc.contributor.author | Acar, Mustafa Ali. | |
| dc.date.accessioned | 2023-03-16T11:15:39Z | |
| dc.date.available | 2023-03-16T11:15:39Z | |
| dc.date.issued | 2011. | |
| dc.description.abstract | In this study, a new adaptive-passive dynamic vibration absorber design is discussed. This proposed design is composed of a stiff string under tension with a central mass attachment as a dynamic vibration absorber (DVA), a negative stiffness mechanism as a string tension adjustment aid and a tuning controller to make it adaptive. Dynamic properties of adaptive-passive DVA systems are adjusted in real-time by generally varying their stiffness. The adaptive-passive DVA design subject to this thesis uses the string tension as a tuning parameter. The dependency of the natural frequencies of this system on the string tension is analyzed using finite element method and verified analytically. Additionally, a method for adjusting the string tension with almost zero effort is proposed. To achieve this goal, the design incorporated a negative stiffness element to create a quasi-zero stiffness and constant zero-force mechanism when combined with the string. Force-displacement analysis of a system composed of a pre-loaded spring and a rigid link is examined analytically. It was shown that the system can have constant negative stiffness behavior. A string tension adjustment algorithm is created which tunes the DVA system depending on the magnitude and frequency of the most dominant component of the vibration signal. Finally, a prototype of the complete design is built. A series of experimental procedures are conducted on the prototype with the intention of verifying the theoretical calculations. Results obtained from these experiments are also given in the thesis. | |
| dc.format.extent | 30 cm. | |
| dc.format.pages | xxiii, 184 leaves ; | |
| dc.identifier.other | ME 2011 A33 | |
| dc.identifier.uri | https://digitalarchive.library.bogazici.edu.tr/handle/123456789/14965 | |
| dc.publisher | Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011. | |
| dc.relation | Includes appendices. | |
| dc.relation | Includes appendices. | |
| dc.subject.lcsh | Autonomous robots. | |
| dc.subject.lcsh | Intelligent agents (Computer software) | |
| dc.title | Design of an adaptive - passive dynamic vibration absorber composed of a string - mass system equipped with negative stiffness tension adjusting mechanism |
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