GB1368187A - Control of vibration in helicopters - Google Patents
Control of vibration in helicoptersInfo
- Publication number
- GB1368187A GB1368187A GB4042272A GB4042272A GB1368187A GB 1368187 A GB1368187 A GB 1368187A GB 4042272 A GB4042272 A GB 4042272A GB 4042272 A GB4042272 A GB 4042272A GB 1368187 A GB1368187 A GB 1368187A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- points
- cabin
- nodes
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/001—Vibration damping devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/001—Vibration damping devices
- B64C2027/002—Vibration damping devices mounted between the rotor drive and the fuselage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/001—Vibration damping devices
- B64C2027/005—Vibration damping devices using suspended masses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Vibration Prevention Devices (AREA)
- Catching Or Destruction (AREA)
Abstract
1368187 Helicopter TEXTRON Inc 31 Aug 1972 [18 Oct 1971 4 Feb 1972] 40422/72 Heading B7W A helicopter comprises a main body structure 10 subject to vibrations induced by main rotor 14, and a load carrying structure, such as a cabin 50, secured to the structure 10 only at nodal points 40, 41 thereon so that it is isolated from vibrations. The nodes are chosen for a frequency which is the product of the number of rotor blades and an optimum rotor speed such as 300 r.p.m. The main body structure includes most of the fixed weight of the helicopter, such as engines 11, transmission 12, rotor pylon 13 and controls therefor, the cabin 50 housing cargo and passengers. The cabin may be attached to a beam 23 at nodal points 40, 41, Fig. 1, or to nodal points on weighted cantilevered beams (106- 109) mounted to a frame member (104); or a frame member 304, Fig. 8, may have cantilever beams 311-314 to which, in the region of points which are nodes for a dominant rotor-induced frequency, are attached further cantilever beams to which, at points 321-324, which are nodes for a harmonic of the said frequency, loadcarrying structure may be mounted. The connections between the main body structure and the load-carrying structure may be rigid, ball- and-socket or elastomeric.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18994571A | 1971-10-18 | 1971-10-18 | |
| US22344272A | 1972-02-04 | 1972-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1368187A true GB1368187A (en) | 1974-09-25 |
Family
ID=26885636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4042272A Expired GB1368187A (en) | 1971-10-18 | 1972-08-31 | Control of vibration in helicopters |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS5637120B2 (en) |
| AR (1) | AR195795A1 (en) |
| AU (1) | AU465345B2 (en) |
| BE (1) | BE790113A (en) |
| CH (1) | CH549497A (en) |
| DE (1) | DE2243337C3 (en) |
| FR (1) | FR2156749B1 (en) |
| GB (1) | GB1368187A (en) |
| IL (1) | IL40137A (en) |
| IT (1) | IT965293B (en) |
| LU (1) | LU66040A1 (en) |
| NL (1) | NL177992C (en) |
| NO (1) | NO138439C (en) |
| TR (1) | TR17775A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2232481B1 (en) * | 1973-06-08 | 1976-05-07 | Aerospatiale | |
| GB1498222A (en) * | 1974-06-03 | 1978-01-18 | Textron Inc | Vibration isolation in helicopters |
| US4140028A (en) * | 1977-09-13 | 1979-02-20 | The Boeing Company | Vibration isolation system |
| US5118051A (en) * | 1989-04-18 | 1992-06-02 | United Technologies Corporation | Roll vibration absorber |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3514054A (en) * | 1967-06-05 | 1970-05-26 | United Aircraft Corp | Vibration isolation system |
-
0
- BE BE790113D patent/BE790113A/en unknown
-
1972
- 1972-08-09 NO NO2830/72A patent/NO138439C/en unknown
- 1972-08-15 IL IL40137A patent/IL40137A/en unknown
- 1972-08-23 AU AU45859/72A patent/AU465345B2/en not_active Expired
- 1972-08-29 AR AR243804A patent/AR195795A1/en active
- 1972-08-31 GB GB4042272A patent/GB1368187A/en not_active Expired
- 1972-09-02 DE DE2243337A patent/DE2243337C3/en not_active Expired
- 1972-09-08 LU LU66040A patent/LU66040A1/xx unknown
- 1972-09-09 IT IT52657/72A patent/IT965293B/en active
- 1972-09-11 CH CH1336372A patent/CH549497A/en not_active IP Right Cessation
- 1972-09-21 JP JP9417672A patent/JPS5637120B2/ja not_active Expired
- 1972-09-29 NL NLAANVRAGE7213233,A patent/NL177992C/en not_active IP Right Cessation
- 1972-10-17 FR FR7236696A patent/FR2156749B1/fr not_active Expired
- 1972-10-17 TR TR17775A patent/TR17775A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL177992B (en) | 1985-08-01 |
| JPS4849198A (en) | 1973-07-11 |
| AU4585972A (en) | 1974-02-28 |
| AR195795A1 (en) | 1973-11-09 |
| IL40137A0 (en) | 1972-11-28 |
| CH549497A (en) | 1974-05-31 |
| NL177992C (en) | 1986-01-02 |
| FR2156749B1 (en) | 1976-08-20 |
| IT965293B (en) | 1974-01-31 |
| LU66040A1 (en) | 1973-01-17 |
| DE2243337B2 (en) | 1980-12-04 |
| TR17775A (en) | 1976-09-01 |
| NL7213233A (en) | 1973-04-24 |
| NO138439C (en) | 1978-09-06 |
| IL40137A (en) | 1974-11-29 |
| BE790113A (en) | 1973-04-13 |
| JPS5637120B2 (en) | 1981-08-28 |
| DE2243337A1 (en) | 1973-04-26 |
| DE2243337C3 (en) | 1981-08-27 |
| FR2156749A1 (en) | 1973-06-01 |
| AU465345B2 (en) | 1975-09-25 |
| NO138439B (en) | 1978-05-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |