FR2669981A1 - Improvement to dynamic dampers - Google Patents
Improvement to dynamic dampers Download PDFInfo
- Publication number
- FR2669981A1 FR2669981A1 FR9015023A FR9015023A FR2669981A1 FR 2669981 A1 FR2669981 A1 FR 2669981A1 FR 9015023 A FR9015023 A FR 9015023A FR 9015023 A FR9015023 A FR 9015023A FR 2669981 A1 FR2669981 A1 FR 2669981A1
- Authority
- FR
- France
- Prior art keywords
- damping
- natural frequency
- adjustment
- improvement
- frame
- 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
Classifications
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/1005—Vibration-dampers; Shock-absorbers using inertia effect characterised by active control of the mass
- F16F7/1011—Vibration-dampers; Shock-absorbers using inertia effect characterised by active control of the mass by electromagnetic means
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- 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
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
Abstract
Description
La présente invention concerne un perfectionnement des dispositifs d'atténuation des vibrations mécaniques appelées amortisseurs dynamiques. The present invention relates to an improvement in devices for attenuating mechanical vibrations called dynamic dampers.
Elle trouve son application partout où il est nécessaire de réduire les vibrations propres de structures, ponts, ouvrages d'arts, sous marins, bateaux, véhicules, etc. It finds its application wherever it is necessary to reduce the natural vibrations of structures, bridges, works of art, submarines, boats, vehicles, etc.
Les amortisseurs dynamiques sont connus depuis fort longtemps. Ils sont constitués d'une masse suspendue à un ressort, appelée équipage mobile, les mouvements de cet équipage mobile étant amortis par un fluide visqueux ou un dispositif de frottement solide. Dynamic shock absorbers have been known for a very long time. They consist of a mass suspended from a spring, called a moving element, the movements of this moving element being damped by a viscous fluid or a solid friction device.
La fréquence propre de vibration de cet équipage est identique à la fréquence propre de la structure dont il faut atténuer les vibrations. Le perfectionnement selon l'invention remplace le dispositif cité ci-dessus par un ensemble d'amortissement électromagnétique inerte, ne nécessitant pas de source d'énergie extérieure.The natural frequency of vibration of this crew is identical to the natural frequency of the structure whose vibrations must be attenuated. The improvement according to the invention replaces the device mentioned above by an inert electromagnetic damping assembly, requiring no external energy source.
De plus, il comporte un ensemble de masselottes amovibles permettant le réglage très précis de la fréquence de résonance. In addition, it includes a set of removable weights allowing very precise adjustment of the resonance frequency.
L'efficacité d'un amortisseur dynamique placé sur un équipement dont il faut atténuer les vibrations dépend essentiellement de la valeur de l'amortissement de l'équipage mobile et de l'ajustement de sa fréquence vibratoire. L'amortissement fourni soit par l'interposition d'un fluide visqueux, soit par un dispositif à frottement solide est difficilement contrôlable: la viscosité des fluides utilisables dépend très fortement de la température et de plus leur utilisation nécessite des enceintes étanches, coûteuses et une absence totale de gaz. Les dispositifs à frottements solides vieillissent, s'usent et gomment. Ces procédés rendent l'ajustage de l'amortissement pour une application particulière difficile et souvent impossible. The effectiveness of a dynamic damper placed on an equipment whose vibrations must be attenuated depends essentially on the value of the damping of the moving element and on the adjustment of its vibratory frequency. The damping provided either by the interposition of a viscous fluid, or by a solid friction device is difficult to control: the viscosity of the usable fluids very strongly depends on the temperature and moreover their use requires sealed, expensive enclosures and a complete absence of gas. Solid friction devices age, wear and tear. These methods make adjusting the damping for a particular application difficult and often impossible.
Le perfectionnement selon l'invention supprime ces inconvénients. The improvement according to the invention eliminates these drawbacks.
Selon l'invention le dispositif assurant l'amortissement est constitué d'un aimant annulaire solidaire de l'équipage mobile créant, par le moyen de pièces polaires adaptées, un champ magnétique radial intense dans un entrefer annulaire. According to the invention, the device ensuring damping consists of an annular magnet secured to the movable assembly creating, by means of suitable pole pieces, an intense radial magnetic field in an annular air gap.
Selon l'invention, un tore de révolution en forme de bague en matériau conducteur, cuivre ou aluminium, autre métal ou alliage conducteur, est placé dans l'entrefer annulaire cidessus et est solidairement fixé par un moyen connu à la structure à amortir. According to the invention, a torus of revolution in the form of a ring made of conductive material, copper or aluminum, other metal or conductive alloy, is placed in the above annular air gap and is fixedly attached by known means to the structure to be damped.
Selon l'invention, les courants induits par les mouvements relatifs de l'équipage mobile et du tube ci-dessus décrits provoquent une dissipation d'énergie contrôlée et parfaitement calculable, générant ainsi l'amortissement souhaité. According to the invention, the currents induced by the relative movements of the mobile assembly and of the tube described above cause a controlled and perfectly calculable energy dissipation, thus generating the desired damping.
Selon l'invention, l'épaisseur du tube conducteur impose la dissipation d'énergie et son choix règle l'amortissement voulu. According to the invention, the thickness of the conductive tube requires energy dissipation and its choice regulates the desired damping.
Selon l'invention, ltéquipage mobile comporte des masselottes amovibles, de masses différentes fixées sur l'équipage mobile, et telles qu'elles permettent d'ajuster précisemment la fréquence propre de l'équipage mobile à la fréquence exacte de la structure à amortir. According to the invention, the mobile equipment comprises removable weights, of different masses fixed on the mobile equipment, and such that they make it possible to precisely adjust the natural frequency of the mobile equipment to the exact frequency of the structure to be damped.
Une description préférentielle non limitative est représentée par les figures 1 et 2 .La figure 1 montre une coupe de l'amortisseur dynamique. Selon l'invention l'équipage mobile (1) est suspendu par 2 ressorts (2 et 3) constitués d'une fine feuille d'alliage élastique découpé et ajouré selon un procédé et une forme connue assurant la souplesse désirée, et maintenus à écartement constant par les 2 bagues (4 et 5). A preferred non-limiting description is shown in Figures 1 and 2. Figure 1 shows a section of the dynamic damper. According to the invention, the mobile assembly (1) is suspended by 2 springs (2 and 3) made up of a thin sheet of elastic alloy cut and perforated according to a known method and shape ensuring the desired flexibility, and kept apart constant by the 2 rings (4 and 5).
La plaque épaulée (8), vissée sur l'équipage mobile (1) par les vis non représentées (11), immobilise les 2 ressorts (2 et 3), et, par l'intermédiaire du boulon (10), immobilise les masselottes de réglage de fréquence propre dont une seule (9) est repérée. The shouldered plate (8), screwed onto the mobile assembly (1) by the screws not shown (11), immobilizes the 2 springs (2 and 3), and, by means of the bolt (10), immobilizes the flyweights natural frequency adjustment of which only one (9) is identified.
Les 2 couronnes en élastomère (12 et 13) servent de butée en cas de chocs violents, de même que les 2 épaulements (14 et 15) limitent les débattements radiaux de l'équipage mobile (1). The 2 elastomer rings (12 and 13) serve as a stop in the event of violent shocks, just as the 2 shoulders (14 and 15) limit the radial deflections of the mobile assembly (1).
L'aimant (16), collé à l'équipage mobile (1) est centré par un épaulement de positionnement (18). The magnet (16), glued to the moving element (1) is centered by a positioning shoulder (18).
La pièce polaire (17) est collée sur l'aimant (16) et est centrée par l'épaulement (19). The pole piece (17) is glued to the magnet (16) and is centered by the shoulder (19).
La bague de cuivre (20) est placée dans l'entrefer (21) parcouru par le flux magnétique radial de l'aimant (16).The copper ring (20) is placed in the air gap (21) through which the radial magnetic flux of the magnet (16) passes.
La bague de métal conducteur (20) est brasée à l'enveloppe (23) dans l'alvéole (22). The conductive metal ring (20) is brazed to the casing (23) in the cell (22).
L'enveloppe (23 ) est rendue solidaire de la structure (24) à amortir par un moyen connu non représenté. The envelope (23) is made integral with the structure (24) to be damped by a known means not shown.
Le couvercle (25) est immobilisé par plusieurs vis (26) non représentées et presse les 2 ressorts (2 et 3) contre l'épaulement d'immobilisation (27) et la bague (4) provoquant leur immobilisation parfaite. The cover (25) is immobilized by several screws (26) not shown and presses the 2 springs (2 and 3) against the immobilization shoulder (27) and the ring (4) causing their perfect immobilization.
La vis (28) obture le trou de vérification (29), utilisé pour placer un dispositif de mesure de distance sans contact (30) représenté figure 2, par exemple du type à induction et destiné à contrôler le réglage de la fréquence et de l'amortissement, ce contrôle consistant à créer une perturbation impulsionnelle du bâti et à enregistrer le signal traduisant le mouvement de l'équipage mobile dont un exemple est représenté figure 3: la fréquence propre de l'équipage mobile est donné par T et l'amortissement par la courbe C. The screw (28) closes the verification hole (29), used to place a non-contact distance measuring device (30) shown in Figure 2, for example of the induction type and intended to control the adjustment of the frequency and the 'damping, this control consisting in creating an impulse disturbance of the frame and in recording the signal translating the movement of the moving part of which an example is represented figure 3: the natural frequency of the moving part is given by T and the damping by curve C.
L'enveloppe (23) et le couvercle (25) forment un ensemble de protection appelé bâti. The envelope (23) and the cover (25) form a protective assembly called a frame.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9015023A FR2669981A1 (en) | 1990-11-30 | 1990-11-30 | Improvement to dynamic dampers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9015023A FR2669981A1 (en) | 1990-11-30 | 1990-11-30 | Improvement to dynamic dampers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2669981A1 true FR2669981A1 (en) | 1992-06-05 |
| FR2669981B1 FR2669981B1 (en) | 1995-03-03 |
Family
ID=9402784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9015023A Granted FR2669981A1 (en) | 1990-11-30 | 1990-11-30 | Improvement to dynamic dampers |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2669981A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0608480A1 (en) * | 1993-01-23 | 1994-08-03 | Firma Carl Freudenberg | Oscillation damper |
| EP0790434A3 (en) * | 1996-02-15 | 1998-06-24 | Firma Carl Freudenberg | Active rotation damper |
| FR2758866A1 (en) * | 1997-01-27 | 1998-07-31 | Jacques Clausin | Metal structure vibration damper e.g. for use on a naval or civilian passenger ship |
| FR2765647A1 (en) * | 1997-07-07 | 1999-01-08 | Jacques Clausin | WIDE BAND AND LIGHTWEIGHT SINGLE-AXIS VIBRATION REDUCER |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2051911A1 (en) * | 1970-10-22 | 1972-04-27 | Messerschmitt Boelkow Blohm | Device for the active suppression of vibrations on machines, components or the like |
| GB1511411A (en) * | 1976-01-15 | 1978-05-17 | Standard Telephones Cables Ltd | Shock absorber |
| JPS6267346A (en) * | 1985-09-17 | 1987-03-27 | Hitachi Cable Ltd | Vibro-isolating device |
| GB2192041A (en) * | 1986-06-24 | 1987-12-31 | Fokker Bv | Vibration absorber with controllable resonance frequency |
| DE3741578A1 (en) * | 1986-12-11 | 1988-06-23 | Bridgestone Corp | Vibration-damping devices |
| JPS63312536A (en) * | 1987-06-12 | 1988-12-21 | Hitachi Ltd | Damping device |
-
1990
- 1990-11-30 FR FR9015023A patent/FR2669981A1/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2051911A1 (en) * | 1970-10-22 | 1972-04-27 | Messerschmitt Boelkow Blohm | Device for the active suppression of vibrations on machines, components or the like |
| GB1511411A (en) * | 1976-01-15 | 1978-05-17 | Standard Telephones Cables Ltd | Shock absorber |
| JPS6267346A (en) * | 1985-09-17 | 1987-03-27 | Hitachi Cable Ltd | Vibro-isolating device |
| GB2192041A (en) * | 1986-06-24 | 1987-12-31 | Fokker Bv | Vibration absorber with controllable resonance frequency |
| DE3741578A1 (en) * | 1986-12-11 | 1988-06-23 | Bridgestone Corp | Vibration-damping devices |
| JPS63312536A (en) * | 1987-06-12 | 1988-12-21 | Hitachi Ltd | Damping device |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 11, no. 263 (M-619)(2710) 26 août 1987, & JP-A-62 67346 (HITACHI CABLE LTD) 27 mars 1987, * |
| PATENT ABSTRACTS OF JAPAN vol. 13, no. 153 (M-813)(3501) 13 avril 1989, & JP-A-63 312536 (HITACHI LTD) 21 décembre 1988, * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0608480A1 (en) * | 1993-01-23 | 1994-08-03 | Firma Carl Freudenberg | Oscillation damper |
| EP0790434A3 (en) * | 1996-02-15 | 1998-06-24 | Firma Carl Freudenberg | Active rotation damper |
| FR2758866A1 (en) * | 1997-01-27 | 1998-07-31 | Jacques Clausin | Metal structure vibration damper e.g. for use on a naval or civilian passenger ship |
| FR2765647A1 (en) * | 1997-07-07 | 1999-01-08 | Jacques Clausin | WIDE BAND AND LIGHTWEIGHT SINGLE-AXIS VIBRATION REDUCER |
| WO1999002890A1 (en) * | 1997-07-07 | 1999-01-21 | Jacques Clausin | Tuned wideband and very light uniaxial vibration reducer |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2669981B1 (en) | 1995-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse | ||
| RN | Application for restoration | ||
| FC | Decision of inpi director general to approve request for restoration | ||
| ST | Notification of lapse | ||
| RN | Application for restoration | ||
| FC | Decision of inpi director general to approve request for restoration |