EP3445947A1 - Procédé d'optimisation d'une fréquence propre d'une aube mobile et aube mobile - Google Patents

Procédé d'optimisation d'une fréquence propre d'une aube mobile et aube mobile

Info

Publication number
EP3445947A1
EP3445947A1 EP17730757.6A EP17730757A EP3445947A1 EP 3445947 A1 EP3445947 A1 EP 3445947A1 EP 17730757 A EP17730757 A EP 17730757A EP 3445947 A1 EP3445947 A1 EP 3445947A1
Authority
EP
European Patent Office
Prior art keywords
blade
recess
blade root
natural frequency
plate
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.)
Withdrawn
Application number
EP17730757.6A
Other languages
German (de)
English (en)
Inventor
Fathi Ahmad
Radan RADULOVIC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP3445947A1 publication Critical patent/EP3445947A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
    • 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
    • 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H13/00—Measuring resonant frequency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/10—Manufacture by removing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/12—Testing on a test bench
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/83—Testing, e.g. methods, components or tools therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise

Definitions

  • the present invention relates to a method for optimizing a design of a rotor blade, which has a blade root and an airfoil, in which an actual natural frequency of the blade detected, compared the detected actual natural frequency with a reference value or reference range and, if one of the intended use of the blade impairs deviation or Convention ⁇ humor between the actual resonant frequency and the reference value or reference range is determined, a structural modifications ⁇ alteration to the blade for changing the natural frequency is made. Furthermore, the invention relates to a rotor blade having a blade root and an airfoil.
  • Turbomachines such as gas turbines, have at least one blade ring with a plurality of blades, which is arranged on a rotor and rotates together with the ⁇ sem. Each of these blades is a vibratory system that is excited to vibrate during operation of the turbomachine, each blade generally at its natural frequencies
  • a natural frequency analysis of a blade is usually carried out at the end of a manufacturing process, as a result of Fer ⁇ production tolerances and production inaccuracies, beispiels- wise deviations in the wall thickness of the blades, frequency changes.
  • a prediction of the natural frequency of a moving blade at an earlier time is hardly possible entspre ⁇ accordingly.
  • DE 10 2009 053 247 proposes AI, thus whose oscillation frequency is changed, the mass distribution of the rotor blade and apply a material by means of an additive Ferti ⁇ off procedure has a surface area of the blade.
  • the tip of the blade is provided with an additional coating. It is therefore known, as a structural change of the blade whose wall thickness to increase by applying a coating. With this measure, however, only minor Fre ⁇ frequency changes in the range of less Hz can be achieved, which is why a shift of the natural frequency from the resonance range is not always possible.
  • Increasing the coating thickness of a blade thus does not constitute a robust and reliable egg ⁇ genfrequenzkorrekturcoastddling, which results in doubt that blades are newly manufactured as a committee to Declara- Center.
  • increasing the layer thickness causes other problems because the thicknesses of functional coatings are deliberately chosen in the original design of the blade. For example, a change in the layer thickness can have a negative effect on the thermal load capacity of the blade.
  • JP S63-97803 A known to modify the size of the contact surface of Trag ⁇ flanks of blades to adjust the natural frequencies.
  • the object of the present invention is a method for optimizing a design a blade for a turbomachine exiguously ⁇ len, which makes it possible to change a natural frequency of the blade easily and reliably, so that it is clear au ⁇ ßercher a critical frequency range. Furthermore, a blade is to be specified with a design optimized in this sense.
  • the present invention provides a method of the type mentioned, which is characterized in that as a structural change at least one recess is formed at a predetermined position on at least one side surface of the blade root.
  • the contact surface between the blade root and the blade foot recording is targeted by the inventive design of at least one recess reduced, so as to influence the vibration frequency of the blade.
  • This procedure is particularly good, therefore, an adjusting screw ⁇ for a reliable change of a Eigenfre acid sequence of the blade is, since the natural frequency of the rotor blade can be varied in a comparatively large extent.
  • the remaining design of the blade is not affected, so that the inventive method causes no problems. Furthermore, it can be done easily and inexpensively.
  • the blade for detecting the actual natural frequency is inserted with its blade root in a Schaufelfuß ⁇ recording an excitation device of a Schwingungsmess ⁇ state, so contact surfaces of the blade root and Schaufelfußing. Then a vibration in the blade is excited and measured the excited vibration of the rotor blade.
  • the blade root receiver of the vibration measuring stand has within Certain manufacturing tolerances on the same geometry as a trained in the runner real Schaufelfuß technique for the running ⁇ scoop on. Thus, it is possible to carry out Fre ⁇ quenz horren on the rotor blade with little effort.
  • the detected actual natural frequency makes it possible to judge whether structural changes in the form of a training of at least one recess on the blade root must be made.
  • the predetermined position of the at least one recess is determined by a plate having at least one hole, in particular at least one circular hole, preferably a hole pattern, between a side surface of the blade root and the Schaufelfußfact the excitation device the vibration measurement is arranged. ⁇ it toward the detected again due to the at least one hole altered natural frequency of the blade and reference value with the re ⁇ or reference range is compared. If the result is satisfactory, the predetermined position was made ausfin ⁇ dig. Otherwise, the process is repeated with varying hole dimensions and / or hole positions until a satisfactory result is achieved.
  • the plate be ⁇ vorzugt is advantageously a thin plate, particularly in the form of an elongated rail, especially of metal, having a thickness between 0.1 and 2 mm, which is releasably, in particular by gluing, on the side face of the actor ⁇ felfußes attached.
  • a thin plate offers the advantage that it can be easily arranged between the side surface of the blade root and the blade root receiver . Since the thin plate is mounted on an elongated side surface of the blade root, an elongated shape is particularly advantageous. An attachment of the thin plate to a side surface by means of a detachable adhesive bond offers the advantage that the thin plate can be removed again after use.
  • the thin plate is slightly flexible and flexible.
  • the thin plate is so long at affordmentli ⁇ chen positions between the side surface of the blade and the Schaufelfußing arranged or replaced by other thin plates with different Lochan füren until the proper use of the Laufschaufei impairing deviation or coincidence between the last detected Natural frequency and the reference value or reference range is detected more.
  • the at least one recess is formed at the position of the at least one hole.
  • the plate can serve as a template for marking the predetermined position.
  • the at least one recess is formed by removing a small amount of blade material, in particular by erosion, drilling, milling, grinding, "smooth blending" and / or other material removal processes, such that, when the blade is used as intended, there is contact between the blade
  • the drilling of holes in the side surface of the blade root is particularly advantageous because it is fast, easy and adopted güns ⁇ tig in the "smooth blending" technique transitions are not angular, but “smooth” so, for example, rounded off.
  • the plate which in particular has an elongated shape, such in an on de r side surface of the Schau ⁇ felfußes provided recess, in particular a groove, ⁇ a laid that the plate with the side surface of the Schaufelfu- It ends flush.
  • a flush closure is preferred because this allows the blade root can be easily inserted into a corre ⁇ sponding Schaufelfuß technique.
  • the plate slightly protrudes from the side surface of the blade root, comparable to the thin plate described above.
  • the length and width of the recess preferably correspond to those of the plate, so that the plate fully fills the recess ⁇ constantly.
  • the recess can already be formed during the production of the blade, for example, during the casting ⁇ process, after the production of the blade whose actual natural frequency is first detected at a inserted into the recess hole-free reference plate, or the Ver ⁇ depression can only are then introduced into the side surface of the blade root when a deviation or coincidence between the actual natural frequency and the reference value or reference range is detected.
  • the forming of the hole during manufacture of the rotor blade provides the advantage that the blade is already provided for all cases with a Ver ⁇ deepening, even if a change in a natural frequency is initially not necessary, but is optionally currency ⁇ rend the operation necessary.
  • the plate remains unchanged and permanently as part of ⁇ the blade in the recess, so that the at least one hole of the plate forms the at least one recess ⁇ .
  • the vorlie ⁇ ing invention also provides a blade of the genann ⁇ th species, which is characterized in that at least one recess is formed on at least one of those side surfaces of the blade root on which the blade when used as intended in a Turbomachine during operation rests under centrifugal force on the support flanks of Schaufelfuß technique the rotor.
  • the recess is located on that side surface of the blade root, which is pressed under centrifugal ⁇ force surface to the rotor.
  • the formation of the at least one recess can be effected in particular by means of the previously described method according to the invention. The advantages of such a recess have previously been described in detail, which is why will not be discussed again at this point.
  • a Vertie ⁇ Fung in particular a longitudinal groove formed in the a corresponding plate, in particular an elongated rail is preferably mounted in metal in a predetermined position
  • the plate with the surface of Schau- foot is in particular flush and the at least ei ⁇ ne recess, in particular in the form of a blind bore or a through hole formed in the plate.
  • the length of the plate corresponds to the length of the depression, so that the plate completely fills the depression.
  • the attachment of the plate in the recess is preferably carried out by gluing, soldering or welding. It should be understood, however, that attachment may in principle also be by other methods such as clamps, notches and / or rivets.
  • Both the Fung as well as the plate can basically have any shape, such as a rectangular, square, ova ⁇ le or polygonal cross-sectional shape. The same applies to the recess, a circular bore is preferred here since it easily, quickly and inexpensively who can ⁇ .
  • the at least one recess is designed in the form of a borehole with a circular cross-section.
  • a recess is particularly advantageous because it can be formed quickly and easily by drilling.
  • the recess may in principle also have any other cross-sectional shape, such as square, rectangular, oval or generally polygonal. It may also be advantageous if the at least one Ausspa ⁇ tion has rounded transitions.
  • the recess extends over about 90% ei ⁇ ner side surface of the blade root or over the entire length of the side surface and into the two end faces of the blade root.
  • the depression extends over approximately 90% of a side surface, it is particularly advantageous if the depression does not extend into either end face. As a result, no additional attachment against translation of the plate in the recess is necessary.
  • FIG. 1 is a schematic front view of a blade during the execution of a first step ei ⁇ nes method according to an embodiment of the forward lying invention
  • Figure 2 is a perspective schematic view of a
  • Figure 3 is a perspective schematic view of a
  • Figure 4 is a perspective schematic view of a
  • Figure 5 is a perspective schematic view of a
  • Figure 6 is a perspective schematic view of a
  • Figure 7 is a perspective schematic view of a
  • Blade root of the blade shown in Figure 6 during the implementation of a third process step
  • Figure 8 is a perspective schematic view of a
  • FIGS. 1 to 5 show a blade 1 with a blade root 4 and an airfoil 5 defining side faces 2 and end faces 3 during five consecutive steps of a method according to a first embodiment of the present invention, which is performed to optimize the design of the blade 1 ,
  • the blade root 4 is usually designed tannbaumförmig or dovetail-shaped, so that its Stirnsei ⁇ te 4 is flat.
  • the rotor blade 1 shown in the figures is intended, for example, to be inserted into a rotor with axial grooves. If the following is from the Soflä ⁇ che 2 of the blade root , then those areas are understood that connect the two opposite, flat faces 3 together and the under normal use of the blade in a turbine or in a compressor in operation under centrifugal force Walls of a blade holding the rotor.
  • an actual natural frequency of the rotor blade 1 is detected in a first step.
  • the blade with its blade root 4 in a Schaufelfußauf ⁇ acquisition 5 of an excitation device 6 of a Schwingungsmess ⁇ stand 7 used such that the side surfaces 2 of the blade root 2 and the surfaces of the Schaufelfußfact 6 contact each other.
  • the rotor blade 1 is excited to vibrate, whereupon an actual natural frequency of the blade 1 is detected.
  • 6 simulates the blade ⁇ foot receptacle of the excitation means 7 the Schaufelfußauf ⁇ Spotifynut a rotor that fluid machine in which the rotor blade is to be installed later 1.
  • the detected actual natural frequency is then compared with an acceptable, previously determined reference range.
  • an intended use of the blade 1 impair ⁇ constricting deviation between the actual resonant frequency and the ac-
  • a structural change is made to the rotor blade 1 in such a way that a recess 9 is formed in one of the side surfaces 2 of the blade root 4 at at least one predetermined position in order to change the actual natural frequency to the desired extent.
  • the predetermined positions are in this connection according to the Figures 2 and 3 first determines, 9 are to be formed to de ⁇ NEN recesses to effect the desired change in the natural frequency of the rotor blade.
  • a thin, about 0.5 mm thick, Lunk ⁇ Lich formed and made of metal plate 10 which is provided with a plurality of holes 11, releasably secured to a side surface 2 of the blade root 4, for example by gluing, whereupon the blade root 4 again be recognized in accordance with Figure 4 in the Schaufelfuß technique 6 of the excitation device 7 ⁇ and the new natural frequency of the rotor blade 1 with the plate 10 held thereon is determined.
  • the new eigenfre ⁇ quency does not match the original natural frequency, since the holes 11 of the plate 10 in the contact area between the blade root 4 and the Schaufelfußing 6 Ei ⁇ genfrequenz affecting defects or Brockmindflä- chen form.
  • the new resonant frequency is still outside the acceptable reference range, the process steps shown in Figu ⁇ ren 2 to 4 under displacement ⁇ bung of the plate are repeated 10 in the direction of the double arrow 12 until a desired resonant frequency is established. If this is not the case, then another plate 10 with a different hole pattern can be used.
  • the shape and dimensions of the plate 10 as well as the shape, dimensions and number of the recesses 9 may vary. Also, in the steps illustrated in FIGS. 2 to 4, a plurality of plates 10 may be arranged on the blade root 4, for example on both side surfaces 2 of the blade root 4.
  • Figures 6 to 8 show method steps of an alterna tive ⁇ method according to an embodiment of the present invention.
  • the actual natural frequency of the run ⁇ blade 1 is determined in a first method step analogous to Figure 1. Is not that within the akzep ⁇ TableN reference range, ones are determined analogously to the method described above, predetermined positive in a second step, in which 1 recesses 9 are provided at a side surface 2 of the spectacle ⁇ felfußes 4 of the blade to the natural frequency of Move bucket 1 to the acceptable reference range.
  • the depression 13 can also extend over approximately 90% of the side surface 2 and in particular into neither of the two end surfaces 3.
  • a plate 14 which is provided with a plurality of holes 15 hen is inserted into the recess 13 such that the Lö ⁇ cher 15 have outward.
  • the dimensions of the plate 14 substantially correspond to those of the recess 13, the upper side of the plate 14 in the recess 13 in Scheme- translated state preferably flush with the blade 4 from ⁇ closes or slightly projecting from the surface of the Schaufelfu ⁇ SLI.
  • the new natural frequency of the rotor blade 1 is determined by the fact ge ⁇ preserved plate 14 according to figure 6, analogous to FIG. 4 If this is not within the acceptable reference range, then the steps illustrated in FIGS. 6 and 7 with plates 14 having different hole patterns are repeated until a desired natural frequency is established. If this is the case, then the one plate 14, with which the desired natural frequency has been achieved, mounted within the recess 13 on the blade root 4, for example by means of soldering or the like, so as to give the arrangement shown in Figure 8.
  • the holes 15 now define recesses analogous to the recesses 9 shown in Figure 5 and form during normal use of the blade 1 in a turbomachine Saltorialsutz between the side surfaces 2 of the blade root 4 and a Schaufelfußability the turbomachine, which lead to an analog natural frequency of the blade 1 which is outside the resonance range.
  • the shape, dimensions as well as the number of recesses 13 and plates 14 as well as the shape, dimensions, locations and number of holes 15 provided in the plate 14 can vary.
  • the recess 13 can already be provided during the manufacture of the rotor blade 1.
  • the first detection of the actual natural frequency is performed with a reference plate inserted into the recess 13 without holes 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un procédé d'optimisation d'une conception d'une aube mobile (1), qui comprend un pied d'aube (4) et une pale d'aube (5), d'une turbomachine, procédé selon lequel une fréquence propre réelle de l'aube mobile (1) est détectée, la fréquence propre réelle détectée est comparée à une valeur de référence ou une plage de référence et, lorsqu'un écart ou une coïncidence entre la fréquence propre réelle et la valeur de référence ou la plage de référence, affectant l'utilisation correcte de l'aube mobile (1), est déterminé(e), une modification structurale de l'aube mobile (1) est effectuée pour modifier sa fréquence propre, au moins un évidement (9 ; 15) étant formé à une position prédéfinie sur au moins une surface latérale (2) du pied d'aube mobile (4) en tant que modification structurale. L'invention concerne en outre une aube mobile (1) pour une turbomachine, laquelle aube comprend un pied d'aube (4) et une pale d'aube (5), au moins un évidement (9 ; 15) étant formé sur au moins une surface latérale (2) du pied d'aube mobile (4).
EP17730757.6A 2016-06-29 2017-06-12 Procédé d'optimisation d'une fréquence propre d'une aube mobile et aube mobile Withdrawn EP3445947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16176789.2A EP3263839A1 (fr) 2016-06-29 2016-06-29 Procédé d'optimisation d'un design d'une aube et aube associée
PCT/EP2017/064263 WO2018001708A1 (fr) 2016-06-29 2017-06-12 Procédé d'optimisation d'une fréquence propre d'une aube mobile et aube mobile

Publications (1)

Publication Number Publication Date
EP3445947A1 true EP3445947A1 (fr) 2019-02-27

Family

ID=56289402

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16176789.2A Withdrawn EP3263839A1 (fr) 2016-06-29 2016-06-29 Procédé d'optimisation d'un design d'une aube et aube associée
EP17730757.6A Withdrawn EP3445947A1 (fr) 2016-06-29 2017-06-12 Procédé d'optimisation d'une fréquence propre d'une aube mobile et aube mobile

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16176789.2A Withdrawn EP3263839A1 (fr) 2016-06-29 2016-06-29 Procédé d'optimisation d'un design d'une aube et aube associée

Country Status (4)

Country Link
US (1) US20190338655A1 (fr)
EP (2) EP3263839A1 (fr)
CN (1) CN109415944A (fr)
WO (1) WO2018001708A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2574493A (en) * 2019-01-22 2019-12-11 Rolls Royce Plc Stacking of rotor blade aerofoil sections to adjust resonant frequencies
US11420259B2 (en) * 2019-11-06 2022-08-23 General Electric Company Mated components and method and system therefore
CN114193793B (zh) * 2021-12-13 2024-04-26 惠阳航空螺旋桨有限责任公司 一种轴流式压缩机用叶片

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6397803A (ja) * 1986-10-13 1988-04-28 Hitachi Ltd タ−ビン翼の固定部構造
CN100560947C (zh) * 2007-10-30 2009-11-18 西安交通大学 涡轮动叶片的叶根平台双楔形块阻尼结构
CN201209463Y (zh) * 2008-04-23 2009-03-18 西安陕鼓动力股份有限公司 一种适用于高炉煤气能量回收透平的不调频的动叶片
DE102009053247A1 (de) 2009-11-13 2011-05-19 Mtu Aero Engines Gmbh Verfahren zum Verändern einer Eigenfrequenz einer Schaufel für eine Strömungsmaschine
US9151167B2 (en) * 2012-02-10 2015-10-06 General Electric Company Turbine assembly
FR3015553B1 (fr) * 2013-12-23 2019-05-31 Safran Aircraft Engines Aube comprenant une echasse, munie d'une seule portion en depression
CN104314619B (zh) * 2014-08-15 2016-02-24 中国燃气涡轮研究院 一种涡轮整体叶盘叶片固有频率调整结构及方法

Also Published As

Publication number Publication date
CN109415944A (zh) 2019-03-01
EP3263839A1 (fr) 2018-01-03
WO2018001708A1 (fr) 2018-01-04
US20190338655A1 (en) 2019-11-07

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