Relative acceleration blade position measurement
US-9481456-B2 · Nov 1, 2016 · US
Lead lag damper for helicopter rotor unit
US9114875B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9114875-B2 |
| Application number | US-201213562405-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 31, 2012 |
| Priority date | Aug 4, 2011 |
| Publication date | Aug 25, 2015 |
| Grant date | Aug 25, 2015 |
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Abstract
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A lead lag damper ( 10, 11 ) for a helicopter rotor unit has a rotor and a hub ( 8 ), said rotor having N rotor modes, with N being the number of blades. This centered single lead lag damper ( 10, 11 ) for the entire rotor unit has an essentially cylindrical shape, with an elastomer material shear element between a first side ( 7 ) and a second side ( 9 ) having a homogenous resistance to shear deformation and being axially preloaded, so that the lead lag damper ( 10, 11 ) acts in a homogenous manner in the rotor inplane eigenmodes. Thus, the lead lag damper ( 10, 11 ) acts as a single unit on the critical inplane mode of the rotor, which is having N identical blades ( 1 - 4 ). The elastomeric material is loaded by a uniform shear deformation in contrary to the commonly used oscillatory deformation.
First claim
Opening claim text (preview).
What is claimed is: 1. A lead lag damper for a rotor unit of a rotary wing aircraft, the rotor unit having a rotor and a hub, the damper comprising: a first side configured to couple to the hub with a central axis of the first side being generally coaxial with a central axis of the hub; a second side spaced from the first side and being opposed to the first side; linking means at the second side to link the second side to a plurality of blades of the rotor; and an essentiall…
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- B64C27/51Primary
Operations & Transport · mapped topic
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Frequently asked questions
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- What does patent US9114875B2 cover?
- A lead lag damper ( 10, 11 ) for a helicopter rotor unit has a rotor and a hub ( 8 ), said rotor having N rotor modes, with N being the number of blades. This centered single lead lag damper ( 10, 11 ) for the entire rotor unit has an essentially cylindrical shape, with an elastomer material shear element between a first side ( 7 ) and a second side ( 9 ) having a homogenous resistance to shear…
- Who is the assignee on this patent?
- Enenkl Bernard, Pfaller Rupert, Airbus Helicopters Deutschland GmbH
- What technology area does this patent fall under?
- Primary CPC classification B64C27/51. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 25 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).