GB1368187A – Control of vibration in helicopters
– Google Patents
GB1368187A – Control of vibration in helicopters
– Google Patents
Control of vibration in helicopters
Info
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
1971-10-18
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
Application number
GB4042272A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Textron Inc
Original Assignee
Textron Inc
Priority date (The priority date 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 date listed.)
1971-10-18
Filing date
1972-08-31
Publication date
1974-09-25
1972-08-31
Application filed by Textron Inc
filed
Critical
Textron Inc
1974-09-25
Publication of GB1368187A
publication
Critical
patent/GB1368187A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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.
GB4042272A
1971-10-18
1972-08-31
Control of vibration in helicopters
Expired
GB1368187A
(en)
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)
* Cited by examiner, † Cited by third party
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)
* Cited by examiner, † Cited by third party
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
IL40137A0
(en)
1972-11-28
DE2243337C3
(en)
1981-08-27
IT965293B
(en)
1974-01-31
LU66040A1
(en)
1973-01-17
JPS5637120B2
(en)
1981-08-28
DE2243337B2
(en)
1980-12-04
FR2156749A1
(en)
1973-06-01
BE790113A
(en)
1973-04-13
AR195795A1
(en)
1973-11-09
AU4585972A
(en)
1974-02-28
DE2243337A1
(en)
1973-04-26
NL7213233A
(en)
1973-04-24
NL177992C
(en)
1986-01-02
AU465345B2
(en)
1975-09-25
JPS4849198A
(en)
1973-07-11
NO138439B
(en)
1978-05-29
NO138439C
(en)
1978-09-06
NL177992B
(en)
1985-08-01
FR2156749B1
(en)
1976-08-20
CH549497A
(en)
1974-05-31
IL40137A
(en)
1974-11-29
TR17775A
(en)
1976-09-01
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(en)
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(en)
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SCHRAGE
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Review of helicopter Mast Mounted Sight(MMS) base motion isolation and Line-of-Sight(LOS) stabilization concepts
Legal Events
Date
Code
Title
Description
1975-02-05
PS
Patent sealed [section 19, patents act 1949]
1992-09-30
PE20
Patent expired after termination of 20 years
