EP0727564B1 - Vibration damping for turbine blades - Google Patents
Vibration damping for turbine blades Download PDFInfo
- Publication number
- EP0727564B1 EP0727564B1 EP96810059A EP96810059A EP0727564B1 EP 0727564 B1 EP0727564 B1 EP 0727564B1 EP 96810059 A EP96810059 A EP 96810059A EP 96810059 A EP96810059 A EP 96810059A EP 0727564 B1 EP0727564 B1 EP 0727564B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- blade
- ring
- cover plates
- damping
- 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 - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/16—Form or construction for counteracting blade vibration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/26—Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
Definitions
- the invention relates to a device for damping Blade vibrations of an axially flowed turbomachine, where the ends of the rotating blades against the sealing the flow-limiting wall of a turbine housing.
- the rotating blades are for a specific one Field of operating conditions designed without resonance. Due to varying operating conditions, e.g. Changes in volume flow of the flowing work equipment or back pressure operation in the border area, the blades become vibrations stochastically excited. In the case of vibration resonance, these lead mechanical stresses for blade failure.
- the invention has for its object a device for vibration damping for turbine blades at the beginning shown type, in which each shovel individually and is steamed smoothly.
- the advantages of the invention can be seen, inter alia, in the fact that the blades are not coupled to contact surfaces of damping devices rubbing against one another, such as cover plates, damper wires or bolts.
- the blades are individually damped without friction and thus free of wear. It is also advantageous that, when axially installed in a turbine wheel, the assembly of individual blades is simplified, since no tangential damping structures of adjacent blades overlap one another.
- blade cover plates be made of aluminum, because with this choice of material good electrical properties with low specific Connect weight. Centrifugal forces in the order of magnitude, as they occur with known cover plate damping because of the much smaller and therefore lighter cover plate construction of the invention reduced to. this means reduced mechanical stress for the turbine blade.
- FIG. 1 shows a section of a turbine housing 1, which is radially opposite a blade end 8 of a turbine rotor blade 2.
- the blade shown is an end blade, for example an LP steam turbine.
- a ring 4 made of permanent magnetic material is attached at a designated point on the turbine housing 1 around a not shown, bladed turbine wheel.
- This magnetic ring 4 consists of partial rings 6, which are combined in a housing 5 made of austenitic steel and fastened with this in the turbine housing 1.
- the magnetic ring 4 is divided into three partial rings 6 with alternating magnetic polarization 7a, b, c, the polarization scheme SNS being present.
- the turbine blade 2 which is located radially opposite the magnetic ring 4, has a cover plate 3 at its blade end 8, as shown in FIG. 2.
- this cover plate 3 When viewed from the top, this cover plate 3 has approximately the shape of a rhombus, the acute-angled corners of which are flattened parallel to the direction of rotation 9 of the turbine blades 2 .
- the blades 2 are free-standing, ie the cover plates 3 of adjacent blades 2 are dimensioned such that they are not tangentially overlapping and do not touch one another.
- a preferred alloy for the permanent magnet ring 4 is cobalt samarium (Co-Sm). Because of its good electrical properties and the low specific weight for metals, it is advantageous to manufacture the blade cover plate 3 from aluminum. The low specific weight enables the cover plate 3 of the blades 2 subjected to centrifugal force to be made light. The good electrical conductivity of the aluminum favors the eddy currents and thus, as mentioned above, the damping behavior.
- the invention is not limited to the exemplary embodiment shown and described.
- the number of partial rings 6 involved in the magnetic ring 4 and their magnetic polarization 7a, b, c are also conceivable in a different configuration, although a different magnet material could also be preferred to the Co-Sm.
- the partial rings 6 can also be designed as electrically fed toroidal coils.
- the design of the blade cover plate 3 is also conceivable from a material other than aluminum. Taking into account the higher specific weight of ferromagnetic metals and their alloys, these materials are also extremely suitable for the production of the cover plates. Their magnetic properties are outstanding here, which means a considerable reduction in the magnetic air gap between a cover plate and the flow-limiting wall. The dissipated vibration energy can thus be increased by favoring the magnetic flux in the cover plate.
- the invention can also be used in a damping manner in the case of shroud-wheel-bound paddle wheels.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Vibration Prevention Devices (AREA)
Description
Die Erfindung betrifft eine Einrichtung zur Dämpfung von Schaufelschwingungen einer axial durchströmten Turbomaschine, bei welcher die Enden der rotierenden Schaufeln gegen die strömungsbegrenzende Wand eines Turbinengehäuses dichten.The invention relates to a device for damping Blade vibrations of an axially flowed turbomachine, where the ends of the rotating blades against the sealing the flow-limiting wall of a turbine housing.
Bei Turbomaschinen sind die rotierenden Schaufeln für ein bestimmtes Feld der Betriebsbedingungen resonanzfrei ausgelegt. Durch variierende Betriebsbedingungen, z.B. Volumenstromänderungen des strömenden Arbeitsmittels oder Gegendruckbetrieb im Grenzbereich, werden die Schaufeln stochastisch zu Schwingungen angeregt. Im Fall von Schwingungsresonanz führen diese mechanischen Beanspruchungen zum Versagen der Schaufeln.In turbomachinery, the rotating blades are for a specific one Field of operating conditions designed without resonance. Due to varying operating conditions, e.g. Changes in volume flow of the flowing work equipment or back pressure operation in the border area, the blades become vibrations stochastically excited. In the case of vibration resonance, these lead mechanical stresses for blade failure.
Zur Dämpfung dieser Schwingungen sind verschiedene Einrichtungen
entwickelt worden, die die Schaufeln aneinander koppeln
und damit schwingungsdämpfend wirken. Bekannte Konzepte
sind beispielsweise Dämpferdrähte, Dämpferbolzen, Schaufeldeckplatten,
sowie angeschmiedete Nocken mit Stiften.
Derartige Einrichtungen für die Dämpfung von Schaufelschwingungen
sind bekannt aus DE B 1 299 004 und US 3 185 441.
Dabei sind die Einsatzbereiche der vorgeschlagenen Dämpfungsmittel
beschränkt. Bohrungen für die Aufnahme von Dämpferdrähten
oder Dämpferbolzen beeinträchtigen die Festigkeit der
Schaufelprofile, und die Dämpferdrähte und -bolzen selbst
verschlechtern die Strömungseigenschaften des strömenden Arbeitmittels.
Hohe Fliehkräfte treten nachteilig ins Gewicht bei der Dämpfung
mittels Schaufeldeckplatten, die benachbarte Schaufelköpfe
zu einem geschlossenen Ring aneinanderkoppeln und durch
Reibschluss dämpfend wirken. Die Ausführung und Bearbeitung
dieser Schaufeldeckplatten, sowie die Schaufelmontage mit
diesen Deckplatten ist wegen der geforderten Massgenauigkeit
aufwendig und teuer.
Hinzu kommt, dass bei den Dämpfungseinrichtungen, die auf
Reibschluss benachbarter Schaufeln basieren, durch eine Abnützung
der Kontaktflächen, die geforderte Dämpfung beeinträchtigt
wird und somit Revisionen nötig sind.Various devices have been developed to dampen these vibrations, which couple the blades to one another and thus have a vibration-damping effect. Known concepts are, for example, damper wires, damper bolts, blade cover plates and forged cams with pins.
Such devices for damping blade vibrations are known from DE B 1 299 004 and US 3 185 441. The fields of use of the proposed damping means are limited. Bores for receiving damper wires or damper bolts impair the strength of the blade profiles, and the damper wires and bolts themselves impair the flow properties of the flowing working fluid.
High centrifugal forces adversely affect damping by means of blade cover plates, which couple adjacent blade heads together to form a closed ring and have a damping effect due to frictional engagement. The execution and processing of these blade cover plates, as well as the blade assembly with these cover plates, is complex and expensive because of the required dimensional accuracy.
In addition, the damping devices that are based on the frictional engagement of adjacent blades, due to wear on the contact surfaces, impair the required damping and therefore require revisions.
Außerdem ist aus dem Stand der Technik z.Bsp. das Dokument US-A-5 490 759 bekannt.In addition, for example. the document US-A-5 490 759 is known.
Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung zur Schwingungsdämpfung für Turbinenschaufeln der eingangs genannten Art darzustellen, bei der jede Schaufel individuell und reibungslos gedämpft wird.The invention has for its object a device for vibration damping for turbine blades at the beginning shown type, in which each shovel individually and is steamed smoothly.
Erfindungsgemäss wird dies dadurch erreicht, dass auf der strömungsbegrenzenden Wand des Turbinengehäuses in radialer Richtung gegenüber den Schaufelenden ein Ring aus permanentmagnetischem Material angebracht ist, der aus mindestens einem oder mehreren Teilringen gleicher oder unterschiedlicher magnetischer Polarisation besteht, und dass die Schaufelenden mit je einer Deckplatte versehen sind, welche aus einem elektrisch gut leitenden Material besteht.According to the invention this is achieved in that on the flow-limiting wall of the turbine housing in radial A ring made of permanent magnetic towards the blade ends Material is made up of at least one or several partial rings of the same or different magnetic polarization exists and that the blade ends are each provided with a cover plate which consists of a there is good electrical conductivity.
Die Vorteile der Erfindung sind unter anderem darin zu sehen,
dass die Schaufeln nicht gekoppelt sind an Kontaktflächen von
aneinander reibenden Dämpfungseinrichtungen wie Deckplatten,
Dämpferdrähte oder -bolzen. Bei der vorgeschlagenen Dämpfungseinrichtung
werden die Schaufeln reibungs- und damit
verschleissfrei individuell gedämpft.
Vorteilhaft ist ferner, dass bei axialem Einbau in ein Turbinenrad
die Montage einzelner Schaufeln vereinfacht ist, da
keine tangentialen Dämpfungskonstruktionen benachbarter
Schaufeln einander überlappen.The advantages of the invention can be seen, inter alia, in the fact that the blades are not coupled to contact surfaces of damping devices rubbing against one another, such as cover plates, damper wires or bolts. In the proposed damping device, the blades are individually damped without friction and thus free of wear.
It is also advantageous that, when axially installed in a turbine wheel, the assembly of individual blades is simplified, since no tangential damping structures of adjacent blades overlap one another.
Es ist besonders zweckmässig, wenn die Schaufeldeckplatten aus Aluminium gefertigt werden, da sich bei dieser Materialwahl gute elektrische Eigenschaften mit geringem spezifischen Gewicht verbinden. Auch Fliehkräfte in der Grössenordnung, wie sie bei bekannten Deckplattendämpfungen vorkommen, treten wegen den wesentlich kleineren und damit leichteren Deckplattenkonstruktion der Erfindung reduziert auf. Dies bedeutet für die Turbinenschaufel eine verminderte mechanische Beanspruchung.It is particularly useful if the blade cover plates be made of aluminum, because with this choice of material good electrical properties with low specific Connect weight. Centrifugal forces in the order of magnitude, as they occur with known cover plate damping because of the much smaller and therefore lighter cover plate construction of the invention reduced to. this means reduced mechanical stress for the turbine blade.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung
vereinfacht dargestellt.
Es zeigen:
- Fig.1
- einen Teillängsschnitt einer Schaufelspitze mit einem radial gegenüberliegenden Magnetring;
- Fig.2
- einen Schnitt nach Linie II-II gemäss Fig.1.
Show it:
- Fig. 1
- a partial longitudinal section of a blade tip with a radially opposite magnetic ring;
- Fig. 2
- a section along line II-II according to Fig.1.
Es sind nur die für das Verständnis der Erfindung wesentlichen
Elemente gezeigt.
Nicht dargestellt in der Zeichnung ist ein Turbinenschaufelfuss
und eine Montageansicht der Schaufel in einem Turbinenrad. Only the elements essential for understanding the invention are shown.
Not shown in the drawing is a turbine blade root and an assembly view of the blade in a turbine wheel.
In Fig.1 ist von einem Turbinengehäuse 1 ein Ausschnitt gezeigt,
der einem Schaufelende 8 einer Turbinenlaufschaufel 2
radial gegenüberliegt. Wie aus dem Überschallschaufelprofil
in Fig.2 erkennbar, handelt es sich bei der dargestellten
Schaufel um eine Endschaufel, beispielsweise einer ND-Dampfturbine.
In Umfangsrichtung ist an bezeichneter Stelle
des Turbinengehäuses 1 um ein nicht dargestelltes, beschaufeltes
Turbinenrad ein Ring 4 aus permanentmagnetischem Material
angebracht. Dieser Magnetring 4 besteht aus Teilringen
6, die in einem Gehäuse 5 aus austenitischem Stahl zusammengefasst
sind und mit diesem im Turbinengehäuse 1 befestigt
sind. Dabei ist der Magnetring 4 in drei Teilringe 6 mit einander
abwechselnder magnetischer Polarisation 7a,b,c unterteilt,
wobei das Polarisationsschema SNS vorliegt.
Die dem Magnetring 4 radial gegenüberliegende Turbinenschaufel
2 hat an deren Schaufelende 8, wie Fig. 2 zeigt, eine
Deckplatte 3. Diese Deckplatte 3 weist bei radialer Draufsicht
annähernd die Form eines Rhombus auf, dessen spitzwinklige
Ecken parallel zur Rotationsrichtung 9 der Turbinenschaufeln
2 abgeflacht sind. Die Schaufeln 2 sind freistehend,
d.h., die Deckplatten 3 benachbarter Schaufeln 2 sind
so bemessen, dass sie tangential nicht überlappend sind und
einander nicht berühren.1 shows a section of a turbine housing 1, which is radially opposite a
The
Bei Rotation des nicht dargestellten Turbinenrades in Rotationsrichtung
9 bleibt das magnetische Feld 10 des Permanentmagnetringes
4 für die Schaufeldeckplatte 3 solange konstant,
wie die Schaufel 2 keine Schwingbewegung ausübt. Schwingt jedoch
die Turbinenschaufel 2, so ist der magnetische Fluss in
der Schaufeldeckplatte 3 zeitlich veränderlich. Dieser zeitlich
veränderlicher Magnetfluss induziert in der Schaufeldeckplatte
3 Wirbelströme, die zur Produktion von Joule'scher
Wärme führen. Diese Energiedissipation hat eine Dämpfung der
Schaufelschwingung zur Folge. Die Joule'sche Wärme und damit
der Dämpfungseffekt wächst mit der elektrischen Leitfähigkeit
des Deckplattenmaterials.When the turbine wheel, not shown, rotates in the direction of
Eine bevorzugte Legierung für den Permanentmagnetring 4 ist
Cobalt-Samarium (Co-Sm).
Wegen seiner guten elektrischen Eigenschaften und dem für
Metalle geringen spezifischen Gewicht ist es von Vorteil, die
Schaufeldeckplatte 3 aus Aluminium zu fertigen.
Das geringe spezifische Gewicht ermöglicht eine leichte Ausführung
der Deckplatte 3 der fliehkraftbelasteten Schaufeln
2. Die gute elektrische Leitfähigkeit des Aluminiums begünstigt
die Wirbelströme und damit, wie oben erwähnt, das
Dämpfungsverhalten.A preferred alloy for the
Because of its good electrical properties and the low specific weight for metals, it is advantageous to manufacture the
The low specific weight enables the
Selbstverständlich ist die Erfindung nicht auf das gezeigte
und beschriebene Ausführungsbeispiel beschränkt. So ist die
Anzahl der am Magnetring 4 beteiligten Teilringe 6 und deren
magnetische Polarisation 7a,b,c auch in anderer Konfiguration
denkbar, wobei auch ein anderer Magnetwerkstoff dem Co-Sm
vorgezogen werden könnte.
Weiterhin sind die Teilringe 6 auch als elektrisch gespeiste
Ringkernspulen ausführbar.
Im Sinne der Erfindung ist die Ausführung der Schaufeldeckplatte
3 auch aus einem anderen Material als Aluminium denkbar.
Unter Inkaufnahme des höheren spezifischen Gewichts von
ferromagnetischen Metallen und ihren Legierungen, eignen sich
diese Materialien ebenfalls ausserordentlich gut für die
Fertigung der Deckplatten. Herausragend sind hier ihre magnetischen
Eigenschaften, welche eine erhebliche Verkleinerung
des magnetischen Luftspalts zwischen einer Deckplatte und der
strömungsbegrenzenden Wand bedeutet. Die dissipierte
Schwingungsenergie kann somit durch eine Begünstigung des
magnetischen Flusses in der Deckplatte erhöht werden.
Selbstverständlich kann die Erfindung auch bei deckbandgebundenen
Schaufelrädern zusätzlich dämpfend eingesetzt
werden. Of course, the invention is not limited to the exemplary embodiment shown and described. The number of
Furthermore, the
In the sense of the invention, the design of the
- 11
- TurbinengehäuseTurbine casing
- 22nd
- Schaufelshovel
- 33rd
- SchaufeldeckplatteBucket cover plate
- 44th
- Ring aus permanentmagnetischem MaterialRing made of permanent magnetic material
- 55
- austenistisches Stahlgehäuseaustenistic steel case
- 66
- permanentmagnetischer Teilringpermanent magnetic ring
- 7a,c7a, c
- magnetische Polarisation S eines Teilringsmagnetic polarization S of a partial ring
- 7b7b
- magnetische Polarisation N eines Teilringsmagnetic polarization N of a partial ring
- 88th
- SchaufelendeBlade end
- 99
- Rotationsrichtung der Turbinenschaufeln in radialer DraufsichtDirection of rotation of the turbine blades in radial Top view
- 1010th
- Magnetfeldlinien des PermanentmagnetringesMagnetic field lines of the permanent magnet ring
Claims (6)
- Device for damping blade vibrations of an axial-flow turbomachine, in which the ends (8) of the rotating blades (2) form a seal towards the flow-limiting wall of a turbine casing (1), characterized in that a ring (4) of permanently magnetic material is attached to the flow-limiting wall of the turbine casing (1) in the radial direction opposite the blade ends (8), which ring (4) consists of at least one or more sectional rings (6) of the same or different magnetic polarization (7a,b), and in that the blade ends (8) are each provided with a cover plate (3) which is made of a material which is a good electrical conductor.
- Device according to Claim 1, characterized in that the permanent-magnet ring (4) consists of three sectional rings (6) having the polarization scheme NSN or SNS, and in that this permanent-magnet ring (4) is surrounded by a nonmagnetic housing (5).
- Device according to Claim 1, characterized in that adjacent cover plates (3) of the blades (2) do not touch one another.
- Device according to Claim 1, characterized in that the cover plates (3) of the blades (2) are produced from aluminium.
- Device according to Claim 1, characterized in that the cover plates (3) of the blades (2) are produced from a ferromagnetic material.
- Use of the device according to Claim 1 in turbomachines having free-standing blades (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19505389 | 1995-02-17 | ||
DE19505389A DE19505389A1 (en) | 1995-02-17 | 1995-02-17 | Vibration damping for turbine blades |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0727564A1 EP0727564A1 (en) | 1996-08-21 |
EP0727564B1 true EP0727564B1 (en) | 1998-11-04 |
Family
ID=7754243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96810059A Expired - Lifetime EP0727564B1 (en) | 1995-02-17 | 1996-01-29 | Vibration damping for turbine blades |
Country Status (10)
Country | Link |
---|---|
US (1) | US5709527A (en) |
EP (1) | EP0727564B1 (en) |
JP (1) | JPH08240103A (en) |
KR (1) | KR960031759A (en) |
CN (1) | CN1140230A (en) |
CA (1) | CA2162933A1 (en) |
DE (2) | DE19505389A1 (en) |
ES (1) | ES2126374T3 (en) |
HU (1) | HU218551B (en) |
PL (1) | PL312681A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2072755A1 (en) | 2007-12-21 | 2009-06-24 | Siemens Aktiengesellschaft | Magnetic device for dampening blade vibration in turbo engines |
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US6422813B1 (en) * | 1999-09-03 | 2002-07-23 | Hood Technology Corporation | Apparatus for producing vibration in turbo-machinery blades |
US6607359B2 (en) | 2001-03-02 | 2003-08-19 | Hood Technology Corporation | Apparatus for passive damping of flexural blade vibration in turbo-machinery |
US6796408B2 (en) * | 2002-09-13 | 2004-09-28 | The Boeing Company | Method for vibration damping using superelastic alloys |
GB0410778D0 (en) * | 2004-05-13 | 2004-06-16 | Rolls Royce Plc | Blade arrangement |
KR100621514B1 (en) * | 2004-12-17 | 2006-09-19 | (주)오토씨에프티 | Hinge |
US7270517B2 (en) * | 2005-10-06 | 2007-09-18 | Siemens Power Generation, Inc. | Turbine blade with vibration damper |
EP2253801A1 (en) | 2009-05-12 | 2010-11-24 | Alstom Technology Ltd | Rotor blades with vibration damping system |
CH704127A1 (en) | 2010-11-24 | 2012-05-31 | Alstom Technology Ltd | Method for influence in particular steam or suppress of during operation occurring mechanical vibrations in a turbomaschinen shovel turbomaschinen scoop for implementing the process and piezoelectric damping element for installation in such turbomaschinen shovel. |
DE102012201048B4 (en) * | 2012-01-25 | 2014-03-27 | MTU Aero Engines AG | Method and damping device for vibration damping of a blade of a turbomachine, and turbomachine |
US8915718B2 (en) * | 2012-04-24 | 2014-12-23 | United Technologies Corporation | Airfoil including damper member |
JP6236723B2 (en) * | 2013-09-04 | 2017-11-29 | 公益財団法人鉄道総合技術研究所 | Vibration damping device and power storage device including vibration damping device |
EP3000976A1 (en) * | 2014-09-29 | 2016-03-30 | Siemens Aktiengesellschaft | Method of manipulating an oscillation state of a rotor component, corresponding system and fluid energy machine |
CN104455180A (en) * | 2014-10-16 | 2015-03-25 | 浙江省海运集团舟山五洲船舶修造有限公司 | Stabilization sleeve for slender shaft of marine engine |
JP6380845B2 (en) * | 2014-12-22 | 2018-08-29 | 三菱日立パワーシステムズ株式会社 | Rotating machine |
US10371050B2 (en) * | 2014-12-23 | 2019-08-06 | Rolls-Royce Corporation | Gas turbine engine with rotor blade tip clearance flow control |
US10465544B2 (en) | 2017-07-24 | 2019-11-05 | United Technologies Corporation | Eddy current damper for lift off seal |
US10822965B2 (en) * | 2018-03-26 | 2020-11-03 | General Electric Company | Active airfoil vibration control |
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-
1995
- 1995-02-17 DE DE19505389A patent/DE19505389A1/en not_active Withdrawn
- 1995-11-15 CA CA002162933A patent/CA2162933A1/en not_active Abandoned
- 1995-11-16 US US08/558,858 patent/US5709527A/en not_active Expired - Fee Related
- 1995-12-15 KR KR1019950050708A patent/KR960031759A/en not_active Application Discontinuation
- 1995-12-20 HU HU9503685A patent/HU218551B/en not_active IP Right Cessation
-
1996
- 1996-01-29 EP EP96810059A patent/EP0727564B1/en not_active Expired - Lifetime
- 1996-01-29 ES ES96810059T patent/ES2126374T3/en not_active Expired - Lifetime
- 1996-01-29 DE DE59600750T patent/DE59600750D1/en not_active Expired - Fee Related
- 1996-02-07 PL PL96312681A patent/PL312681A1/en unknown
- 1996-02-14 CN CN96101417A patent/CN1140230A/en active Pending
- 1996-02-14 JP JP8026669A patent/JPH08240103A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2072755A1 (en) | 2007-12-21 | 2009-06-24 | Siemens Aktiengesellschaft | Magnetic device for dampening blade vibration in turbo engines |
US8568088B2 (en) | 2007-12-21 | 2013-10-29 | Siemens Aktiengesellschaft | Magnetic device for damping blade vibrations in turbomachines |
Also Published As
Publication number | Publication date |
---|---|
EP0727564A1 (en) | 1996-08-21 |
PL312681A1 (en) | 1996-08-19 |
JPH08240103A (en) | 1996-09-17 |
ES2126374T3 (en) | 1999-03-16 |
DE19505389A1 (en) | 1996-08-22 |
KR960031759A (en) | 1996-09-17 |
DE59600750D1 (en) | 1998-12-10 |
HU218551B (en) | 2000-10-28 |
HU9503685D0 (en) | 1996-02-28 |
HUT76395A (en) | 1997-08-28 |
US5709527A (en) | 1998-01-20 |
CA2162933A1 (en) | 1996-08-18 |
CN1140230A (en) | 1997-01-15 |
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