CA1062226A - Extended arm bifilar and method to eliminate second order vibration excitation - Google Patents
Extended arm bifilar and method to eliminate second order vibration excitationInfo
- Publication number
- CA1062226A CA1062226A CA257,611A CA257611A CA1062226A CA 1062226 A CA1062226 A CA 1062226A CA 257611 A CA257611 A CA 257611A CA 1062226 A CA1062226 A CA 1062226A
- Authority
- CA
- Canada
- Prior art keywords
- bifilar
- helicopter
- length
- rotor
- mass
- 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
- 230000005284 excitation Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title description 2
- 239000006096 absorbing agent Substances 0.000 claims abstract description 60
- 230000033001 locomotion Effects 0.000 claims abstract description 21
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 18
- 230000008093 supporting effect Effects 0.000 claims description 10
- 230000008030 elimination Effects 0.000 abstract description 3
- 238000003379 elimination reaction Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/001—Vibration damping devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
- F16F15/1407—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers the rotation being limited with respect to the driving means
- F16F15/145—Masses mounted with play with respect to driving means thus enabling free movement over a limited range
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
- Y10S416/50—Vibration damping features
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Vibration Prevention Devices (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/633,886 US4057363A (en) | 1975-11-20 | 1975-11-20 | Extended arm bifilar and method to eliminate second order vibration excitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062226A true CA1062226A (en) | 1979-09-11 |
Family
ID=24541529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA257,611A Expired CA1062226A (en) | 1975-11-20 | 1976-07-23 | Extended arm bifilar and method to eliminate second order vibration excitation |
Country Status (11)
| Country | Link |
|---|---|
| US (2) | US4057363A (en]) |
| JP (2) | JPS5264798A (en]) |
| BR (1) | BR7607360A (en]) |
| CA (1) | CA1062226A (en]) |
| CH (1) | CH605252A5 (en]) |
| DE (1) | DE2645980C2 (en]) |
| FR (1) | FR2332176A1 (en]) |
| GB (1) | GB1516567A (en]) |
| IL (1) | IL50685A (en]) |
| IT (1) | IT1064390B (en]) |
| NL (1) | NL7611834A (en]) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5495924A (en) * | 1994-07-13 | 1996-03-05 | Quiescence Engineering Corp. | Half-order centrifugal pendulum vibration absorber system |
| FR2733483B1 (fr) * | 1995-04-27 | 1997-07-04 | Eurocopter France | Dispositif d'attenuation de vibrations pour rotor d'helicoptere |
| US5924845A (en) * | 1997-04-07 | 1999-07-20 | The United States Of America As Represented By The Secretary Of The Air Force | Centrifugal pendulum absorber for engine blades |
| US5954480A (en) * | 1997-08-28 | 1999-09-21 | Sikorsky Aircraft Corporation | Vibration isolator for rotorcraft |
| US5901616A (en) * | 1997-09-15 | 1999-05-11 | Sikorsky Aircraft Corporation | Inertial mass for vibration isolators |
| US8162606B2 (en) | 2004-08-30 | 2012-04-24 | Lord Corporation | Helicopter hub mounted vibration control and circular force generation systems for canceling vibrations |
| US8267652B2 (en) * | 2004-08-30 | 2012-09-18 | Lord Corporation | Helicopter hub mounted vibration control and circular force generation systems for canceling vibrations |
| US7722322B2 (en) * | 2004-08-30 | 2010-05-25 | Lord Corporation | Computer system and program product for controlling vibrations |
| US8435002B2 (en) * | 2004-08-30 | 2013-05-07 | Lord Corporation | Helicopter vibration control system and rotating assembly rotary forces generators for canceling vibrations |
| US7448854B2 (en) * | 2004-08-30 | 2008-11-11 | Lord Corporation | Helicopter vibration control system and rotary force generator for canceling vibrations |
| EP2209713B1 (en) * | 2007-10-25 | 2013-09-25 | Lord Corporation | Distributed active vibration control systems and rotary wing aircraft with suppressed vibrations |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2552739A (en) * | 1951-05-15 | Method of tracking kotor blades | ||
| US2519762A (en) * | 1945-07-09 | 1950-08-22 | United Aircraft Corp | Gyrodynamic damper |
| US3372758A (en) * | 1967-02-15 | 1968-03-12 | United Aircraft Corp | Vibration absorber |
| US3488998A (en) * | 1967-08-24 | 1970-01-13 | Charles A Bonsor | Balancing device |
| US3540809A (en) * | 1968-09-20 | 1970-11-17 | United Aircraft Corp | Vibration damped helicopter rotor |
| GB1443148A (en) * | 1972-10-19 | 1976-07-21 | Westland Aircraft Ltd | Bifilar vibration dampers |
| GB1445686A (en) * | 1972-11-06 | 1976-08-11 | Westland Aircraft Ltd | Vibration absorbing systems |
| GB1465266A (en) * | 1973-04-26 | 1977-02-23 | Westland Aircraft Ltd | Rotors for rotary wing aircraft |
| GB1468359A (en) * | 1973-10-09 | 1977-03-23 | Westland Aircraft Ltd | Bifilar vibration dampers |
| US3952601A (en) * | 1974-12-18 | 1976-04-27 | United Technologies Corporation | Helicopter rotor blade balancing method |
| US3988073A (en) * | 1975-04-11 | 1976-10-26 | United Technologies Corporation | Spherical bifilar tuning pin bushing |
| US3988074A (en) * | 1975-11-13 | 1976-10-26 | United Technologies Corporation | Anhedral bifilar |
-
1975
- 1975-11-20 US US05/633,886 patent/US4057363A/en not_active Expired - Lifetime
-
1976
- 1976-07-23 CA CA257,611A patent/CA1062226A/en not_active Expired
- 1976-10-01 FR FR7629522A patent/FR2332176A1/fr active Granted
- 1976-10-12 DE DE2645980A patent/DE2645980C2/de not_active Expired
- 1976-10-15 GB GB42994/76A patent/GB1516567A/en not_active Expired
- 1976-10-15 IL IL50685A patent/IL50685A/xx unknown
- 1976-10-15 CH CH1308476A patent/CH605252A5/xx not_active IP Right Cessation
- 1976-10-26 NL NL7611834A patent/NL7611834A/xx not_active Application Discontinuation
- 1976-11-04 BR BR7607360A patent/BR7607360A/pt unknown
- 1976-11-09 JP JP51134618A patent/JPS5264798A/ja active Pending
- 1976-11-18 IT IT29472/76A patent/IT1064390B/it active
- 1976-12-27 US US05/754,667 patent/US4083654A/en not_active Expired - Lifetime
-
1986
- 1986-03-14 JP JP1986037462U patent/JPS6235680Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61163799U (en]) | 1986-10-11 |
| IT1064390B (it) | 1985-02-18 |
| JPS5264798A (en) | 1977-05-28 |
| GB1516567A (en) | 1978-07-05 |
| DE2645980C2 (de) | 1986-07-31 |
| CH605252A5 (en]) | 1978-09-29 |
| BR7607360A (pt) | 1977-09-20 |
| DE2645980A1 (de) | 1977-06-08 |
| US4057363A (en) | 1977-11-08 |
| IL50685A0 (en) | 1976-12-31 |
| JPS6235680Y2 (en]) | 1987-09-10 |
| FR2332176A1 (fr) | 1977-06-17 |
| IL50685A (en) | 1979-11-30 |
| US4083654A (en) | 1978-04-11 |
| FR2332176B1 (en]) | 1981-05-29 |
| NL7611834A (nl) | 1977-05-24 |
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