FR2692329A1 - Absorber for dynamic frequencies and variable vibrations - comprises two tubes of identical geometry built in symmetrical manner on fixing part forming base, two tubes having threaded sockets at their ends - Google Patents

Absorber for dynamic frequencies and variable vibrations - comprises two tubes of identical geometry built in symmetrical manner on fixing part forming base, two tubes having threaded sockets at their ends Download PDF

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Publication number
FR2692329A1
FR2692329A1 FR9207198A FR9207198A FR2692329A1 FR 2692329 A1 FR2692329 A1 FR 2692329A1 FR 9207198 A FR9207198 A FR 9207198A FR 9207198 A FR9207198 A FR 9207198A FR 2692329 A1 FR2692329 A1 FR 2692329A1
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tubes
vibration damping
damping device
dynamic vibration
fixing part
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FR9207198A
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French (fr)
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FR2692329B1 (en
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Clausin Jacques
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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
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The device for absorbing dynamic vibrations comprises two tubes of identical geometry built in a symmetrical manner on a fixing part forming a base (1). The two tubes (2) are prolonged by two threaded sockets (3) fixed at their ends and these two threads serve as screws for two striker inertia mechanisms. The frequency required is adjusted by screwing of the striker inertia massess (4). The precise frequency required is assured by two heavy screws (7,8). USE/ADVANTAGE - In structures, boats, vehicles, etc. Reduces vibrations in machines or vibrating elements.

Description

La présente invention concerne un perfectionnement des dispositifs d'atténuation des vibrations mécaniques appelés amortisseurs dynamiques. The present invention relates to an improvement in mechanical vibration attenuation devices 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 own 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.The natural frequency of vibration of this crew is identical to the natural frequency of the structure whose vibrations must be attenuated.

Le perfectionnement selon l'invention consiste en un assemblage de moyens connus peu coûteux et robustes, permettant un réglage de fréquence et d'amortissement précis. The improvement according to the invention consists of an assembly of known inexpensive and robust means, allowing precise frequency and damping adjustment.

Selon l'invention, l'amortisseur dynamique consiste en un bloc d'alliage métallique solidement boulonné à la structure à amortir, que l'on appellera par la suite l'embase. Par un procédé de soudure ou de brasure, et selon un axe perpendiculaire à l'axe de la vibration à amortir, 2 tubes cylindriques identiques d'alliages métalliques sont encastrés de part et d'autre de l'embase ci-dessus, dans des alvéoles cylindriques usinées à cet effet. According to the invention, the dynamic damper consists of a block of metallic alloy firmly bolted to the structure to be damped, which will be called the base thereafter. By a welding or brazing process, and along an axis perpendicular to the axis of the vibration to be damped, 2 identical cylindrical tubes of metal alloys are embedded on either side of the above base, in cylindrical cells machined for this purpose.

Selon l'invention, les extrémités libres de ces 2 tubes sont fixées par un moyen connu, tel que le collage, à 2 autres parties tubulaires filetées extérieurement, d'axe commun à l'axe des 2 tubes, et constituant la vis d'un assemblage dont l'écrou est un cylindre d'alliage à masse spécifique élevée, pouvant se déplacer par vissage le long du tube et d'axe identique à ce dernier, qui est appelé masselotte. According to the invention, the free ends of these 2 tubes are fixed by known means, such as gluing, to 2 other tubular parts threaded externally, with an axis common to the axis of the 2 tubes, and constituting the screw. an assembly whose nut is an alloy cylinder with a high specific mass, which can be displaced by screwing along the tube and with an identical axis to the latter, which is called a counterweight.

Selon l'invention, la fréquence de vibration propre de l'assemblage formé par le tube encastré et la masselotte ci-dessus est réglée par le déplacement axial de cette masse, obtenu par vissage. La fréquence propre du résonateur mécanique est donc déterminée par la masse de la masselotte et la raideur de flexion du tube. According to the invention, the natural vibration frequency of the assembly formed by the recessed tube and the above counterweight is adjusted by the axial displacement of this mass, obtained by screwing. The natural frequency of the mechanical resonator is therefore determined by the mass of the counterweight and the bending stiffness of the tube.

Selon l'invention, l'ensemble ainsi constitué est protégé des détériorations dues aux chocs ou aux vibrations trop importantes par une barre cylindrique de diamètre inférieur au diamètre intérieur de chaque tube, et de longueur supérieure à la longueur du tube, la partie dépassant étant soudée ou brasée à l'embase dans un alvéole cylindrique concentrique à l'alvéole de soudure ou de brasure des tubes. According to the invention, the assembly thus formed is protected from deterioration due to excessive shock or vibration by a cylindrical bar of diameter less than the inside diameter of each tube, and of length greater than the length of the tube, the projecting part being welded or brazed to the base in a cylindrical cell concentric with the cell for soldering or brazing the tubes.

Selon l'invention, Iorsqu'une déflexion trop importante d'un tube risquant de dépasser la limite élastique du matériau constitutif intervient, le tube vient buter contre la barre cidessus, suffisamment rigide pour arrêter le mouvement de déflexion du tube et ainsi ne pas dégrader les performances de l'amortisseur.  According to the invention, when an excessive deflection of a tube which risks exceeding the elastic limit of the constituent material occurs, the tube abuts against the above bar, rigid enough to stop the deflection movement of the tube and thus does not degrade the performance of the shock absorber.

Selon l'invention, l'espace laissé libre entre chaque tube et la barre est rempli, si nécessaire, d'un fluide organique visqueux du type bien connu des fluides hydrauliques, qui provoque l'amortissement de l'ensemble oscillant. Ce fluide est maintenu en place par un obturateur d'étanchéification placé en bout des parties tubulaires formant vis d'assemblage. According to the invention, the space left free between each tube and the bar is filled, if necessary, with a viscous organic fluid of the well-known type of hydraulic fluids, which causes the oscillating assembly to be damped. This fluid is held in place by a sealing shutter placed at the end of the tubular parts forming assembly screws.

Selon l'invention, la viscosité du fluide est choisie en fonction de l'amortissement désiré, qui dépend des caractéristiques mécaniques de la structure à amortir. According to the invention, the viscosity of the fluid is chosen as a function of the desired damping, which depends on the mechanical characteristics of the structure to be damped.

Une description non limitative du dispositif est détaillée figure 1 et figure 2.  A non-limiting description of the device is detailed in Figure 1 and Figure 2.

La figure 1 représente une vue de dessus, la figure 2 une coupe selon le plan de coupe
AA.Figure 1 shows a top view, Figure 2 a section along the cutting plane
AA.

L'embase (1) est fixée à la structure (9) par 4 vis (10). Les 2 tubes (2) sont fixés par brasure à l'embase (1) selon la surface de révolution (13), le trou foré (11) servant à introduire l'alliage de brasage pendant l'opération de brasage. La barre (17) est de même fixée par brasure à l'embase (1) selon la surface de révolution (14), le trou foré (12) servant à introduire l'alliage de brasage. The base (1) is fixed to the structure (9) by 4 screws (10). The 2 tubes (2) are fixed by brazing to the base (1) according to the surface of revolution (13), the drilled hole (11) serving to introduce the brazing alloy during the brazing operation. The bar (17) is likewise fixed by brazing to the base (1) along the surface of revolution (14), the drilled hole (12) serving to introduce the brazing alloy.

Selon l'invention, la douille (3) est filetée sur toute sa partie cylindrique extérieure, qui sert de vis à la masselotte (4) et au contre écrou de blocage (5). Cette douille (3) est alésée sur toute sa surface intérieure de manière fixée selon la surface (15), par exemple, par collage au tube (2). Un chambrage (17) de diamètre supérieur au diamètre de la surface (15), est ménagé de manière à ce que le tube ne vienne pas au contact de la douille lorsque le tube est soumis à des efforts de flexion. According to the invention, the sleeve (3) is threaded over its entire external cylindrical part, which serves as a screw for the counterweight (4) and the locking nut (5). This sleeve (3) is bored over its entire inner surface in a manner fixed according to the surface (15), for example, by gluing to the tube (2). A recess (17) with a diameter greater than the diameter of the surface (15) is provided so that the tube does not come into contact with the socket when the tube is subjected to bending forces.

Selon l'invention, l'espace annulaire (16) entre tube et barre est rempli de fluide hydraulique assurant l'amortissement qui est déterminé par la viscosité du fluide et le diamètre extérieur de la barre (17) et le diamètre intérieur du tube (2). Cet espace est obturé par la vis pointeau (6), vissée dans la douille (3). According to the invention, the annular space (16) between tube and bar is filled with hydraulic fluid ensuring the damping which is determined by the viscosity of the fluid and the outside diameter of the bar (17) and the inside diameter of the tube ( 2). This space is closed by the needle screw (6), screwed into the socket (3).

Selon l'invention, lorsque l'acuité de l'amortisseur doit être importante, le fluide hydraulique est remplacé par l'air ambiant. En ce cas, le réglage de la fréquence propre oscillatoire doit être effectué avec une grande précision. Il s'effectue alors par action sur la vis autofreinée (8) , lestée par un cylindre en métal ou alliage à haute densité, tel que plomb, uranium ou tungstène (7), qui remplit le rôle de vernier de grande précision. According to the invention, when the acuity of the damper must be high, the hydraulic fluid is replaced by the ambient air. In this case, the setting of the oscillating natural frequency must be carried out with great precision. It is then carried out by action on the self-locking screw (8), ballasted with a metal or high-density alloy cylinder, such as lead, uranium or tungsten (7), which fulfills the role of high precision vernier.

Selon l'invention, les 2 ensembles symétriques peuvent être soit accordés sur une même fréquence propre, soit accordés sur 2 fréquences voisines, la conjugaison de cette possibilité et du changement de l'amortissement par changement de fluide hydraulique permet de multiples combinaisons adaptables aux paramètres mécaniques de la structure. According to the invention, the 2 symmetrical sets can be either tuned to the same natural frequency, or tuned to 2 neighboring frequencies, the combination of this possibility and the change in damping by changing the hydraulic fluid allows multiple combinations adaptable to the parameters mechanical of the structure.

Selon l'invention, les masselottes (4) sont démontables à volonté : un même ensemble peut être utilisé pour un grand nombre de cas pratiques d'amortissement de fréquences différentes.  According to the invention, the weights (4) are removable at will: the same assembly can be used for a large number of practical cases of damping at different frequencies.

Claims (8)

REVENDICATIONS 1) Dispositif amortisseur de vibrations dynamiques caractérisé en ce qu'il comporte 2 tubes (2) de géométrie identique encastrés de manière symétrique sur une pièce de fixation formant embase (1). 1) Dynamic vibration damping device characterized in that it comprises 2 tubes (2) of identical geometry symmetrically embedded on a fixing piece forming a base (1). 2) Dispositif amortisseur de vibrations dynamiques selon la revendication 1 caractérisé en ce que ces 2 tubes sont prolongés par 2 douilles filetées (3), fixées à ces derniers. 2) Dynamic vibration damping device according to claim 1 characterized in that these 2 tubes are extended by 2 threaded bushings (3), fixed to the latter. 3) Dispositif amortisseur de vibrations dynamiques selon les revendications 1 et 2 caractérisé en ce que les 2 douilles servent de vis pour 2 masselottes (4). 3) Dynamic vibration damping device according to claims 1 and 2 characterized in that the 2 sockets serve as screws for 2 weights (4). 4) Dispositif amortisseur de vibrations dynamiques selon la revendication 3 caractérisé en ce que la fréquence d'accord est réglée par vissage des masselottes (4). 4) Dynamic vibration damping device according to claim 3 characterized in that the tuning frequency is adjusted by screwing the weights (4). 5) Dispositif amortisseur de vibrations dynamiques selon la revendication 1 caractérisé en ce qu'il comporte une barre cylindrique de dimension inférieure au diamètre des tubes, solidement encastrée sur l'embase (1), et de façon concentrique aux tubes (2), servant de butée. 5) Dynamic vibration damping device according to claim 1 characterized in that it comprises a cylindrical bar of dimension smaller than the diameter of the tubes, firmly embedded on the base (1), and concentrically with the tubes (2), serving stop. 6) Dispositif amortisseur de vibrations dynamiques selon la revendication 5 caractérisé en ce que l'espace séparant la barre (7) et les tubes (2) est rempli par un fluide hydraulique assurant l'amortissement du système oscillant formé par le tube, la douille et la masselotte. 6) Dynamic vibration damping device according to claim 5 characterized in that the space separating the bar (7) and the tubes (2) is filled with a hydraulic fluid ensuring the damping of the oscillating system formed by the tube, the bush and the flyweight. 7) Dispositif amortisseur de vibrations dynamiques selon la revendication 6 caractérisé en ce que l'amortissement peut être réglé en changeant le type de fluide hydraulique. 7) Dynamic vibration damping device according to claim 6 characterized in that the damping can be adjusted by changing the type of hydraulic fluid. 8) Dispositif amortisseur de vibrations dynamiques selon la revendication 1 caractérisé en ce que le réglage précis de la fréquence d'accord est assuré par 2 vis balourdées (7) et (8).  8) A damper for dynamic vibrations according to claim 1 characterized in that the precise adjustment of the tuning frequency is ensured by 2 unbalanced screws (7) and (8).
FR9207198A 1992-06-15 1992-06-15 VARIABLE FREQUENCY AND DAMPING DYNAMIC DAMPING DEVICE FOR REDUCING VIBRATION OF MACHINES OR VIBRATORY ELEMENTS. Expired - Fee Related FR2692329B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9207198A FR2692329B1 (en) 1992-06-15 1992-06-15 VARIABLE FREQUENCY AND DAMPING DYNAMIC DAMPING DEVICE FOR REDUCING VIBRATION OF MACHINES OR VIBRATORY ELEMENTS.

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Application Number Priority Date Filing Date Title
FR9207198A FR2692329B1 (en) 1992-06-15 1992-06-15 VARIABLE FREQUENCY AND DAMPING DYNAMIC DAMPING DEVICE FOR REDUCING VIBRATION OF MACHINES OR VIBRATORY ELEMENTS.

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FR2692329A1 true FR2692329A1 (en) 1993-12-17
FR2692329B1 FR2692329B1 (en) 1996-01-26

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FR9207198A Expired - Fee Related FR2692329B1 (en) 1992-06-15 1992-06-15 VARIABLE FREQUENCY AND DAMPING DYNAMIC DAMPING DEVICE FOR REDUCING VIBRATION OF MACHINES OR VIBRATORY ELEMENTS.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023986A1 (en) * 1995-02-03 1996-08-08 Mesure Et Informatique Mei Vibration damping devices with active control and comprising movable weights excited by electromagnets along 2 or 3 axes
DE19741535B4 (en) * 1997-09-20 2006-01-12 Volkswagen Ag Vibration damper for damping the vibrations of a component

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855570A (en) * 1928-02-28 1932-04-26 Edison Inc Thomas A Vibration eliminating means
FR999128A (en) * 1952-01-25
US2586043A (en) * 1950-10-14 1952-02-19 Northrop Aircraft Inc Kinetic boom damper
DE864178C (en) * 1949-09-03 1953-01-22 Ferdinand Dr-Ing Marguerre Device for reducing mechanical vibrations
GB932872A (en) * 1962-02-01 1963-07-31 Aluminum Co Of America Vibration dampers
US4372431A (en) * 1979-11-05 1983-02-08 The Boeing Company Six axis vibration isolation system
JPS599333A (en) * 1982-07-05 1984-01-18 Matsushita Electric Ind Co Ltd Vibration absorbing device of enclosed rotary compressor
SU1453097A1 (en) * 1987-04-06 1989-01-23 Институт Машиноведения Им.А.А.Благонравова Vibration isolating support

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR999128A (en) * 1952-01-25
US1855570A (en) * 1928-02-28 1932-04-26 Edison Inc Thomas A Vibration eliminating means
DE864178C (en) * 1949-09-03 1953-01-22 Ferdinand Dr-Ing Marguerre Device for reducing mechanical vibrations
US2586043A (en) * 1950-10-14 1952-02-19 Northrop Aircraft Inc Kinetic boom damper
GB932872A (en) * 1962-02-01 1963-07-31 Aluminum Co Of America Vibration dampers
US4372431A (en) * 1979-11-05 1983-02-08 The Boeing Company Six axis vibration isolation system
JPS599333A (en) * 1982-07-05 1984-01-18 Matsushita Electric Ind Co Ltd Vibration absorbing device of enclosed rotary compressor
SU1453097A1 (en) * 1987-04-06 1989-01-23 Институт Машиноведения Им.А.А.Благонравова Vibration isolating support

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 94 (M-293)(1531) 28 Avril 1984 & JP-A-59 009 333 ( MATSUSHITA DENKI SANGYO KK ) 18 Janvier 1984 *
SOVIET INVENTIONS ILLUSTRATED Section PQ, Week 8944, Derwent Publications Ltd., London, GB; Class Q, AN 89-322442 & SU-A-1 453 097 (MECH ENG INST) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023986A1 (en) * 1995-02-03 1996-08-08 Mesure Et Informatique Mei Vibration damping devices with active control and comprising movable weights excited by electromagnets along 2 or 3 axes
FR2730288A1 (en) * 1995-02-03 1996-08-09 Mesure Et Inf Mei ACTIVE-CONTROLLED VIBRATION REDUCTION DEVICES CONSISTING OF MOBILE MASSES EXCITED BY 2 OR 3-AXIS ELECTRO MAGNETS
DE19741535B4 (en) * 1997-09-20 2006-01-12 Volkswagen Ag Vibration damper for damping the vibrations of a component

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