A vibration absorber with variable eigenfrequency for turboprop aircraft
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| Title: | A vibration absorber with variable eigenfrequency for turboprop aircraft |
|---|---|
| Authors: | Keye, S.1 Stefan.Keye@dlr.de, Keimer, R.2, Homann, S.3 |
| Source: | Aerospace Science & Technology. Jun2009, Vol. 13 Issue 4/5, p165-171. 7p. |
| Subjects: | Vibration absorbers, Turboprop airplane engines, Propeller-driven aircraft, Turbojet plane engine blades, Dampers (Mechanical devices), Aerospace engineering |
| Abstract: | Abstract: Typical turboprop noise spectra exhibit a series of characteristic peaks which are directly related to the product of propeller rpm and number of propeller blades. These blade passage frequencies contribute significantly to the overall sound pressure level both outside and inside the aircraft. Their contribution to cabin noise is usually reduced by appropriately adjusted mass dampers. However, since the engine rpm varies for different flight stages, any fixed eigenfrequency absorber will merely be a sub-optimal compromise. The Tunable Vibration Absorber (TVA) introduced in this article has a variable resonant frequency which enables an adaptation to different flight phases providing largely improved performance. Frequency tuning is achieved through a piezo-electric stack actuator, which applies a pressure force to a pair of leaf springs thus reducing their effective bending stiffness. Among the main advantages of this particular approach are a static control signal and low power consumption. To enable a light-weight construction the components which generate the pressure loading are incorporated into the oscillating mass. The TVA allows to cover a wide frequency range using only a single device. Additionally, it features damping control capability and optional active multi-mode operation. Structural-acoustic simulations have indicated a noise reduction potential of approximately 10 dB. This article gives a short overview of different tuneable vibration absorber concepts, lines out the theoretical background of the proposed approach, discusses the general components layout and describes the experimental verification of a prototype TVA for the Airbus A400M. [Copyright &y& Elsevier] |
| Copyright of Aerospace Science & Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 43168525 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A vibration absorber with variable eigenfrequency for turboprop aircraft – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Keye%2C+S%2E%22">Keye, S.</searchLink><relatesTo>1</relatesTo><i> Stefan.Keye@dlr.de</i><br /><searchLink fieldCode="AR" term="%22Keimer%2C+R%2E%22">Keimer, R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Homann%2C+S%2E%22">Homann, S.</searchLink><relatesTo>3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Aerospace+Science+%26+Technology%22">Aerospace Science & Technology</searchLink>. Jun2009, Vol. 13 Issue 4/5, p165-171. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Vibration+absorbers%22">Vibration absorbers</searchLink><br /><searchLink fieldCode="DE" term="%22Turboprop+airplane+engines%22">Turboprop airplane engines</searchLink><br /><searchLink fieldCode="DE" term="%22Propeller-driven+aircraft%22">Propeller-driven aircraft</searchLink><br /><searchLink fieldCode="DE" term="%22Turbojet+plane+engine+blades%22">Turbojet plane engine blades</searchLink><br /><searchLink fieldCode="DE" term="%22Dampers+%28Mechanical+devices%29%22">Dampers (Mechanical devices)</searchLink><br /><searchLink fieldCode="DE" term="%22Aerospace+engineering%22">Aerospace engineering</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Typical turboprop noise spectra exhibit a series of characteristic peaks which are directly related to the product of propeller rpm and number of propeller blades. These blade passage frequencies contribute significantly to the overall sound pressure level both outside and inside the aircraft. Their contribution to cabin noise is usually reduced by appropriately adjusted mass dampers. However, since the engine rpm varies for different flight stages, any fixed eigenfrequency absorber will merely be a sub-optimal compromise. The Tunable Vibration Absorber (TVA) introduced in this article has a variable resonant frequency which enables an adaptation to different flight phases providing largely improved performance. Frequency tuning is achieved through a piezo-electric stack actuator, which applies a pressure force to a pair of leaf springs thus reducing their effective bending stiffness. Among the main advantages of this particular approach are a static control signal and low power consumption. To enable a light-weight construction the components which generate the pressure loading are incorporated into the oscillating mass. The TVA allows to cover a wide frequency range using only a single device. Additionally, it features damping control capability and optional active multi-mode operation. Structural-acoustic simulations have indicated a noise reduction potential of approximately 10 dB. This article gives a short overview of different tuneable vibration absorber concepts, lines out the theoretical background of the proposed approach, discusses the general components layout and describes the experimental verification of a prototype TVA for the Airbus A400M. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Aerospace Science & Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ast.2008.10.001 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 165 Subjects: – SubjectFull: Vibration absorbers Type: general – SubjectFull: Turboprop airplane engines Type: general – SubjectFull: Propeller-driven aircraft Type: general – SubjectFull: Turbojet plane engine blades Type: general – SubjectFull: Dampers (Mechanical devices) Type: general – SubjectFull: Aerospace engineering Type: general Titles: – TitleFull: A vibration absorber with variable eigenfrequency for turboprop aircraft Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Keye, S. – PersonEntity: Name: NameFull: Keimer, R. – PersonEntity: Name: NameFull: Homann, S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 12709638 Numbering: – Type: volume Value: 13 – Type: issue Value: 4/5 Titles: – TitleFull: Aerospace Science & Technology Type: main |
| ResultId | 1 |
