FR2680845A1 - Absorber of vibrational energy - Google Patents
Absorber of vibrational energy Download PDFInfo
- Publication number
- FR2680845A1 FR2680845A1 FR9110918A FR9110918A FR2680845A1 FR 2680845 A1 FR2680845 A1 FR 2680845A1 FR 9110918 A FR9110918 A FR 9110918A FR 9110918 A FR9110918 A FR 9110918A FR 2680845 A1 FR2680845 A1 FR 2680845A1
- Authority
- FR
- France
- Prior art keywords
- elastomeric material
- annular
- rings
- axis
- central axis
- 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.)
- Granted
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 16
- 239000013536 elastomeric material Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 abstract 2
- 238000013016 damping Methods 0.000 description 5
- 239000000806 elastomer Substances 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 239000003190 viscoelastic substance Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/51—Damping of blade movements
-
- 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
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
- F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
- F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
-
- 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
- F16F2236/00—Mode of stressing of basic spring or damper elements or devices incorporating such elements
- F16F2236/10—Shear
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Combined Devices Of Dampers And Springs (AREA)
Abstract
Description
Absorbeur d'énergie vibratoire
La présente invention concerne un absorbeur d'énergie vibratoire tel qu'un adaptateur de fréquence. On entend par adaptateur de fréquence, un dispositif qui filtre et amorti des vibrations. I1 est ainsi placé entre deux pièces dont l'une est soumise, ou bien est source elle-même, de vibrations. Un dispositif de ce genre est par exemple utilisé sur les rotors d'hélicoptères. On dispose ainsi un adaptateur de fréquence, soit entre chaque pale et le rotor, soit pour relier deux pales consécutives.Vibratory energy absorber
The present invention relates to a vibratory energy absorber such as a frequency adapter. Frequency adapter means a device which filters and absorbs vibrations. It is thus placed between two parts, one of which is subject to, or is itself a source of vibration. Such a device is for example used on the rotors of helicopters. There is thus a frequency adapter, either between each blade and the rotor, or to connect two consecutive blades.
On connaît un absorbeur d'énergie vibratoire formé par une bague tubulaire en élastomère moulée entre une armature interne et une bague cylindrique externe. Avant le moulage, l'armature interne et la bague externe reçoivent une couche d'un agent assurant une bonne adhésion de l'élastomère moulée sur l'armature interne et la bague externe. There is known a vibratory energy absorber formed by a tubular elastomer ring molded between an internal frame and an external cylindrical ring. Before molding, the internal reinforcement and the external ring receive a layer of an agent ensuring good adhesion of the molded elastomer to the internal reinforcement and the external ring.
L'ensemble est ensuite emmanché dans un fourreau externe.The assembly is then fitted into an external sleeve.
Lorsque l'absorbeur est d'une grande longueur, il y a quelque difficulté dans le moulage et il se produit en outre un phénomène de balayage qui a pour effet de racler et d'entraîner vers le fond la couche de l'agent adhérisant. When the absorber is of great length, there is some difficulty in molding and there is also a sweeping phenomenon which has the effect of scraping and dragging down the layer of the adhering agent.
Par ailleurs, aux extrémités, ou au moins à l'une des extrémités du dispositif, l'élastomère est au contact de l'air ambiant. Dans le cas d'un adaptateur de fréquence pour rotor d'hélicoptère, par exemple, il est nécessaire que l'élastomère employé soit d'un type résistant au contact de l'ozone mais un tel élastomère ne répond pas le mieux aux autres caractéristiques nécessaires tel que la raideur ou l'amortissement par exemple. Furthermore, at the ends, or at least at one of the ends of the device, the elastomer is in contact with ambient air. In the case of a frequency adapter for a helicopter rotor, for example, it is necessary that the elastomer used is of a type resistant to contact with ozone, but such an elastomer does not best respond to the other characteristics. necessary such as stiffness or damping for example.
L'invention a pour but de proposer un absorbeur d'énergie vibratoire permettant de pallier ces inconvénients et qui en outre présente d'autres avantages qui ressortiront de la suite du texte. The invention aims to provide a vibratory energy absorber to overcome these drawbacks and which also has other advantages which will emerge from the following text.
L'invention a ainsi pour objet un absorbeur d'énergie vibratoire du type cylindrique comprenant un matériau élastomère entre un axe central et un tube extérieur, l'ensemble travaillant axialement en cisaillement, ledit axe central comportant à une extrémité un premier embout de fixation et ledit tube extérieur comportant à l'extrémité opposée un second embout de fixation, caractérisé en ce que ledit matériau élastomère est divisé sous la forme d'une pluralité de bagues annulaires dans chacune desquelles le matériau élastomère est moulé entre une armature annulaire interne et une armature annulaire externe. The subject of the invention is therefore a vibratory energy absorber of the cylindrical type comprising an elastomeric material between a central axis and an external tube, the assembly working axially in shear, said central axis comprising at one end a first fixing end-piece and said outer tube having at the opposite end a second fixing end-piece, characterized in that said elastomeric material is divided in the form of a plurality of annular rings in each of which the elastomeric material is molded between an internal annular frame and a frame external annular.
Selon une disposition particulière, les bagues annulaires sont réparties le long dudit axe selon plusieurs groupes distincts de bagues accolées, les groupes étant séparés les uns des autres par des bagues entretoises. According to a particular arrangement, the annular rings are distributed along said axis according to several distinct groups of contiguous rings, the groups being separated from each other by spacer rings.
Avantageusement, l'axe central est tubulaire. Advantageously, the central axis is tubular.
Les éléments annulaires en matériau élastomère peuvent être choisis de façon à ce qu'ils assurent simultanément les deux fonctions d'élasticité et d'amortissement, mais on peut également dissocier les fonctions en choisissant des bagues en matériau élastomère où la fonction amortissement est la plus faible possible et assurer cette fonction par un moyen hydraulique. The annular elements made of elastomeric material can be chosen so that they simultaneously provide the two functions of elasticity and damping, but it is also possible to dissociate the functions by choosing rings of elastomeric material where the damping function is the most low possible and ensure this function by hydraulic means.
Ainsi, à cet effet, un fluide remplit l'espace entre le second embout de fixation et le tube extérieur, pénètre dans l'axe central tubulaire à travers un bouchon percé d'un trou, remplit cet axe jusqu'à un piston soumis, du côté opposé, à la poussée d'un ressort, traverse un premier groupe de bagues annulaires par des orifices appropriés et remplit jusqu'au groupe suivant l'espace entre le tube externe et l'axe central annulaire qui comporte des ajutages de circulation de fluide. Thus, for this purpose, a fluid fills the space between the second fixing end piece and the outer tube, enters the tubular central axis through a plug pierced with a hole, fills this axis up to a subject piston, on the opposite side, at the push of a spring, passes through a first group of annular rings through suitable orifices and fills up to the group according to the space between the external tube and the annular central axis which has circulation nozzles of fluid.
On va maintenant donner la description d'un exemple de mise en oeuvre de l'invention en se reportant au dessin annexé dans lequel
La figure 1 montre en coupe axiale un absorbeur d'énergie vibratoire selon l'invention.We will now give the description of an example of implementation of the invention with reference to the accompanying drawing in which
Figure 1 shows in axial section a vibratory energy absorber according to the invention.
La figure 2 montre en coupe axiale une variante de la figure 1. FIG. 2 shows in axial section a variant of FIG. 1.
En se reportant à la figure 1, on voit un absorbeur d'énergie vibratoire de type cylindrique qui comprend un axe central tubulaire 1, un tube coaxial extérieur 2 et entre les deux une pluralité de bagues annulaires 3 chacune constituée par un matériau élastomère 4 moulé entre une armature interne 5 et une armature externe 6. Referring to Figure 1, we see a vibratory energy absorber of cylindrical type which includes a central tubular axis 1, an outer coaxial tube 2 and between the two a plurality of annular rings 3 each consisting of a molded elastomeric material 4 between an internal frame 5 and an external frame 6.
L'axe central tubulaire 1 porte à une extrémité un bouchon fileté 7 qui sert de butée pour les bagues annulaires 4 et à l'autre extrémité est vissé un embout de fixation 8 dont la longueur est adaptée par une entretoise 9 et un écrou 10. The tubular central axis 1 carries at one end a threaded plug 7 which serves as a stop for the annular rings 4 and at the other end is screwed a fixing end piece 8 whose length is adapted by a spacer 9 and a nut 10.
A l'extrémité opposée, le tube extérieur 2 est fermé par un bouchon 11 dans lequel est vissé un second embout de fixation 12 équipé d'un écrou de blocage 13. At the opposite end, the outer tube 2 is closed by a plug 11 into which is screwed a second fixing end piece 12 fitted with a locking nut 13.
Ainsi, en utilisant une pluralité de bagues annulaires viscoélastiques 3, on peut ajuster les performances du système en jouant sur le nombre d'éléments et la nature du matériau viscoélastique utilisé. On peut ainsi adapter les propriétés du matériau viscoélastique 4 de chaque bague 3 aux différentes sollicitations qu'ils subissent
- reprise de couple par des bagues plus raides aux extrémités par exemple,
- matériau viscoélastique à tenue spécifiquement adaptée à l'environnement. Par exemple à l'extrémité gauche, au contact de l'air, la dernière bague 3 est en un matériau résistant au contact de l'ozone.Thus, by using a plurality of viscoelastic annular rings 3, the performance of the system can be adjusted by varying the number of elements and the nature of the viscoelastic material used. We can thus adapt the properties of the viscoelastic material 4 of each ring 3 to the different stresses they undergo.
- torque recovery by stiffer rings at the ends for example,
- viscoelastic material with hold specifically adapted to the environment. For example at the left end, in contact with air, the last ring 3 is made of a material resistant to contact with ozone.
Comme on le voit sur la figure, les bagues 3 sont réparties le long de l'axe central annulaire 1 selon trois groupes séparés, chaque groupe comprenant plusieurs bagues accolées. Ainsi, on peut positionner le long de l'absorbeur les bagues de façon à optimiser la répartition de masse par exemple pour améliorer le fonctionnement sous l'effet des forces centrifuges lorsque l'absorbeur est utilisé comme adaptateur de fréquence sur un rotor d'hélicoptère. Les différents groupes de bagues 3 sont séparés par des tubes entretoises 20, 21, 22, 23. As can be seen in the figure, the rings 3 are distributed along the annular central axis 1 according to three separate groups, each group comprising several contiguous rings. Thus, the rings can be positioned along the absorber so as to optimize the mass distribution, for example to improve operation under the effect of centrifugal forces when the absorber is used as a frequency adapter on a helicopter rotor. . The different groups of rings 3 are separated by spacer tubes 20, 21, 22, 23.
En se référant maintenant à la figure 2, on voit une variante. Dans ce cas, le matériau élastomère 4 des bagues annulaires 3 est choisi de façon à n'avoir qu'une fonction élastique et le moins possible amortissante. Le système amortissant est constitué par un fluide qui remplit tout l'espace libre entre le bouchon ll et le tube extérieur 2, pénètre dans l'axe central tubulaire 1 par un trou 14 percé dans le bouchon 7 et remplit l'axe jusqu'à un piston 15 poussé sur son côté opposé par un ressort 16. Le fluide remplit également l'espace situé entre le tube extérieur 2 et l'axe central tubulaire 1 dans la partie située entre les deux groupes de bagues annulaires 3. Les bagues annulaires 3 du groupe de droite sont percées de trous ou comportent des fentes pour le passage du fluide et l'axe central tubulaire 1 ainsi que le tube entretoise 23 comportent également dans la partie située entre les deux groupes de bagues annulaires 3, des ajutages 17 de circulation du fluide. Referring now to Figure 2, we see a variant. In this case, the elastomeric material 4 of the annular rings 3 is chosen so as to have only an elastic function and the least possible damping. The damping system consists of a fluid which fills all the free space between the plug ll and the outer tube 2, enters the central tubular axis 1 through a hole 14 drilled in the plug 7 and fills the axis up to a piston 15 pushed on its opposite side by a spring 16. The fluid also fills the space between the outer tube 2 and the central tubular axis 1 in the part located between the two groups of annular rings 3. The annular rings 3 of the group on the right are pierced with holes or have slots for the passage of the fluid and the tubular central axis 1 as well as the spacer tube 23 also have, in the part situated between the two groups of annular rings 3, circulation nozzles 17 fluid.
Les compensations volumiques du fluide sont compensées par le piston mobile 15 soumis à l'effort du ressort 16. The volume compensations of the fluid are compensated by the movable piston 15 subjected to the force of the spring 16.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9110918A FR2680845B1 (en) | 1991-09-04 | 1991-09-04 | VIBRATORY ENERGY ABSORBER. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9110918A FR2680845B1 (en) | 1991-09-04 | 1991-09-04 | VIBRATORY ENERGY ABSORBER. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2680845A1 true FR2680845A1 (en) | 1993-03-05 |
| FR2680845B1 FR2680845B1 (en) | 1995-02-10 |
Family
ID=9416608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9110918A Expired - Fee Related FR2680845B1 (en) | 1991-09-04 | 1991-09-04 | VIBRATORY ENERGY ABSORBER. |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2680845B1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999006732A1 (en) * | 1997-08-04 | 1999-02-11 | Lord Corporation | Fluid and elastomer apparatus |
| US6378851B1 (en) * | 2000-10-25 | 2002-04-30 | Lord Corporation | Fluid and elastomer apparatus with discrete volume compensator and secondary compliance |
| FR2950027A1 (en) * | 2009-09-11 | 2011-03-18 | Eurocopter France | Drag frequency adapter for rotor blade of helicopter, has return unit including distinct return blocks arranged between external cover and central core, where blocks respectively are made of visco-elastic materials that are different |
| CN107953989A (en) * | 2016-10-14 | 2018-04-24 | 空客直升机 | It is integrated in the lead-lag damper of the blade interior of rotor |
| US20220042571A1 (en) * | 2019-04-26 | 2022-02-10 | Yamaha Corporation | Vibration Damping Member |
| IT202100001028A1 (en) * | 2021-01-21 | 2022-07-21 | Mecaer Aviation Group S P A | VEHICLE DAMPING ROD |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105365516A (en) * | 2015-11-23 | 2016-03-02 | 成都九鼎科技(集团)有限公司 | Shock absorber assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1035413B (en) * | 1954-02-10 | 1958-07-31 | Applic Gomma Antivibranti Iasa | Rubber spring with liquid damping |
| DE8007621U1 (en) * | 1980-03-20 | 1980-07-31 | Boge Gmbh, 5208 Eitorf | Ventilation device for hydraulic devices, especially vibration dampers !! |
| DE2933726A1 (en) * | 1979-08-21 | 1981-03-26 | Fa. Carl Freudenberg, 69469 Weinheim | Vibration damper for machine part oscillating linear motion - has mass in viscoelastic liq., whose physical parameters meet specified equation |
| EP0097091A1 (en) * | 1982-06-11 | 1983-12-28 | Vibrachoc | Vibration damper, in particular a frequency adapter for helicopter blades |
| FR2592696A1 (en) * | 1986-01-09 | 1987-07-10 | Aerospatiale | ELASTIC RECALL PLUG WITH BUILT-IN DAMPING, HYDRO-ELASTIC TYPE. |
| EP0334716A1 (en) * | 1988-03-24 | 1989-09-27 | AEROSPATIALE Société Nationale Industrielle | Blade elastohydraulic return device with linear damping through restriction of a viscous fluid flow |
-
1991
- 1991-09-04 FR FR9110918A patent/FR2680845B1/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1035413B (en) * | 1954-02-10 | 1958-07-31 | Applic Gomma Antivibranti Iasa | Rubber spring with liquid damping |
| DE2933726A1 (en) * | 1979-08-21 | 1981-03-26 | Fa. Carl Freudenberg, 69469 Weinheim | Vibration damper for machine part oscillating linear motion - has mass in viscoelastic liq., whose physical parameters meet specified equation |
| DE8007621U1 (en) * | 1980-03-20 | 1980-07-31 | Boge Gmbh, 5208 Eitorf | Ventilation device for hydraulic devices, especially vibration dampers !! |
| EP0097091A1 (en) * | 1982-06-11 | 1983-12-28 | Vibrachoc | Vibration damper, in particular a frequency adapter for helicopter blades |
| FR2592696A1 (en) * | 1986-01-09 | 1987-07-10 | Aerospatiale | ELASTIC RECALL PLUG WITH BUILT-IN DAMPING, HYDRO-ELASTIC TYPE. |
| EP0334716A1 (en) * | 1988-03-24 | 1989-09-27 | AEROSPATIALE Société Nationale Industrielle | Blade elastohydraulic return device with linear damping through restriction of a viscous fluid flow |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999006732A1 (en) * | 1997-08-04 | 1999-02-11 | Lord Corporation | Fluid and elastomer apparatus |
| US6293532B2 (en) | 1997-08-04 | 2001-09-25 | Lord Corporation | Fluid and elastomer apparatus |
| US6378851B1 (en) * | 2000-10-25 | 2002-04-30 | Lord Corporation | Fluid and elastomer apparatus with discrete volume compensator and secondary compliance |
| EP1203898A3 (en) * | 2000-10-25 | 2003-11-19 | Lord Corporation | Fluid and elastomer apparatus with discrete volume compensator and secondary compliance |
| EP1571369A1 (en) * | 2000-10-25 | 2005-09-07 | Lord Corporation | Fluid and elastomer apparatus with discrete volume compensator and secondary compliance |
| FR2950027A1 (en) * | 2009-09-11 | 2011-03-18 | Eurocopter France | Drag frequency adapter for rotor blade of helicopter, has return unit including distinct return blocks arranged between external cover and central core, where blocks respectively are made of visco-elastic materials that are different |
| CN107953989A (en) * | 2016-10-14 | 2018-04-24 | 空客直升机 | It is integrated in the lead-lag damper of the blade interior of rotor |
| CN107953989B (en) * | 2016-10-14 | 2021-03-02 | 空客直升机 | Lead-lag damper integrated inside the blades of a rotor |
| US11142307B2 (en) | 2016-10-14 | 2021-10-12 | Airbus Helicopters | Lead-lag damper integrated inside a blade of a rotor |
| US20220042571A1 (en) * | 2019-04-26 | 2022-02-10 | Yamaha Corporation | Vibration Damping Member |
| IT202100001028A1 (en) * | 2021-01-21 | 2022-07-21 | Mecaer Aviation Group S P A | VEHICLE DAMPING ROD |
| WO2022157709A1 (en) * | 2021-01-21 | 2022-07-28 | Mecaer Aviation Group S.P.A. | Damping rod for vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2680845B1 (en) | 1995-02-10 |
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| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse | ||
| ST | Notification of lapse |