DE102009046804A1 - Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value - Google Patents
Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value Download PDFInfo
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- DE102009046804A1 DE102009046804A1 DE200910046804 DE102009046804A DE102009046804A1 DE 102009046804 A1 DE102009046804 A1 DE 102009046804A1 DE 200910046804 DE200910046804 DE 200910046804 DE 102009046804 A DE102009046804 A DE 102009046804A DE 102009046804 A1 DE102009046804 A1 DE 102009046804A1
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- blades
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- 238000001228 spectrum Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title claims abstract 3
- 238000012360 testing method Methods 0.000 claims description 32
- 238000007716 flux method Methods 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims 1
- 230000010355 oscillation Effects 0.000 abstract 2
- 244000052769 pathogen Species 0.000 description 8
- 230000001717 pathogenic effect Effects 0.000 description 8
- 230000005284 excitation Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/223—Supports, positioning or alignment in fixed situation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2693—Rotor or turbine parts
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- Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Mathematical Physics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Rissprüfung an Schaufeln eines Rotors einer Strömungsmaschine.The invention relates to a method for crack testing on blades of a rotor of a turbomachine.
Ein Rotor einer Strömungsmaschine, so zum Beispiel ein Rotor einer Gasturbine oder Dampfturbine, verfügt über einen Rotorgrundkörper sowie mehrere am Rotorgrundkörper montierte Schaufeln. Die am Rotorgrundkörper montierten Schaufeln eines Rotors werden auch als Laufschaufeln bezeichnet. Jede Schaufel verfügt über einen Schaufelfuß sowie ein Schaufelblatt und ist mit dem Schaufelfuß in einer entsprechenden Ausnehmung des Rotorgrundkorpers montiert.A rotor of a turbomachine, for example a rotor of a gas turbine or steam turbine, has a rotor main body and a plurality of blades mounted on the rotor main body. The blades of a rotor mounted on the rotor body are also referred to as moving blades. Each blade has a blade root and an airfoil and is mounted with the blade root in a corresponding recess of Rotorgrundkorpers.
Bei der Wartung von Rotoren müssen die Schaufeln einer Rissprüfung unterzogen werden. Zur Rissprüfung haben sich in der Praxis Farbpenetrationsverfahren und Magnetflussverfahren bewährt Diese Verfahren verfügen jedoch über den Nachteil, dass eine Schaufel, die einer Rissprüfung unterzogen werden soll, zwingend vom Rotorgrundkörper entfernt und vor der Rissprüfung einer gründlichen Reinigung unterzogen werden muss. Weder mit Farbpenetrationsverfahren noch mit Magnetflussverfahren ist demnach eine schnelle, effiziente Rissprüfung einer ungereinigten, am Rotorgrundkörper montierten Schaufel möglich.When servicing rotors, the blades must be crack tested. For crack testing, in practice, color penetration methods and magnetic flux methods have proven successful. However, these methods have the disadvantage that a blade which is to be subjected to a crack test must imperatively be removed from the rotor base body and subjected to thorough cleaning before the crack test. Thus, neither color penetration nor magnetic flux methods allow fast, efficient crack testing of an unpurified blade mounted on the rotor body.
Verfahren zur Rissprüfung von Schaufeln, die auf einer Ultraschallprüfung beruhen, sind aus der
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zugrunde, ein Verfahren zur Rissprüfung an Schaufeln eines Rotors einer Strömungsmaschine zu schaffen, das eine einfache und effiziente Rissprüfung erlaubt. Dieses Problem wird durch ein Verfahren gemäß Anspruch 1 gelöst. Erfindungsgemäß wird ein Rotor mit an einem Rotorgrundkörper montierten Schaufeln bereitgestellt, wobei Schaufeln, die zur Rissprüfung am Rotorgrundkörper montiert bleiben, einzeln für sich, zeitlich nacheinander und kontinuierlich zu Schwingungen angeregt werden, wobei dabei für jede angeregte Schaufel ein sich ausbildendes Frequenzspektrum aufgezeichnet wird, wobei aus den aufgezeichneten Frequenzspektren ein Mittelwert berechnet wird, und wobei die aufgezeichneten Frequenzspektren mit dem Mittelwert derart verglichen werden, dass dann, wenn ein Frequenzspektrum einer Schaufel unzulässig vom Mittelwert abweicht, auf eine gerissene oder möglicherweise gerissene Schaufel geschlossen wird.On this basis, the present invention is based on the problem to provide a method for crack testing on blades of a rotor of a turbomachine, which allows a simple and efficient crack test. This problem is solved by a method according to claim 1. According to the invention, a rotor is provided with vanes mounted on a rotor main body, wherein blades which remain mounted for crack testing on the rotor main body, are individually individually, successively and continuously excited to oscillate, wherein for each excited blade a forming frequency spectrum is recorded a mean value is calculated from the recorded frequency spectra and the recorded frequency spectra are compared with the mean such that when a frequency spectrum of a blade deviates impermissibly from the mean, a cracked or possibly cracked blade is concluded.
Mithilfe des erfindungsgemäßen Verfahrens kann effizient eine Rissprüfung an Schaufeln erfolgen, die zur Rissprüfung am Rotorgrundkörper montiert bleiben. Zur Rissprüfung ist keine Reinigung des Rotors erforderlich. Vielmehr erfolgt die Rissprüfung bei ungereinigtem Rotor. Aus Frequenzspektren, die als Reaktion auf die Schwingungsanregung von am Rotorgrundkörper montierten Schaufeln erfasst werden, wird ein Mittelwert berechnet, der für den jeweiligen Rotor als Vergleichswert dient und auf Grundlage dessen auf einen Schaufeldefekt geschlossen wird. Erfindungsgemäß wird demnach kein fixer Referenzwert vorgegeben, vielmehr wird für jeden Rotor, dessen Schaufeln einer Rissprüfung zu unterziehen sind, aus erfassten Frequenzspektren ein individueller Mittelwert als Vergleichswert berechnet. Dies erlaubt eine einfache und effiziente Rissprüfung von ungereinigten, am Rotorgrundkörper montierten Schaufeln eines Rotors.With the aid of the method according to the invention, it is possible to efficiently carry out a crack test on blades which remain mounted on the rotor base body for crack testing. For crack testing, no cleaning of the rotor is required. Rather, the crack test takes place with an unpurified rotor. From frequency spectra detected in response to the vibration excitation of vanes mounted on the rotor body, an average is calculated which serves as the comparison value for the respective rotor and on the basis of which a blade defect is concluded. According to the invention, therefore, no fixed reference value is specified; instead, for each rotor whose blades are to be subjected to a crack test, an individual mean value is calculated as a comparison value from detected frequency spectra. This allows a simple and efficient crack testing of unpurified, mounted on the rotor body blades of a rotor.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Die Erfindung betrifft ein Verfahren zur Rissprüfung an Schaufeln eines Rotors einer Strömungsmaschine, wie zum Beispiel einer Gasturbine oder Dampfturbine.The invention relates to a method for crack testing on blades of a rotor of a turbomachine, such as a gas turbine or steam turbine.
Zur Rissprüfung der Schaufeln
Der Erfindung liegt demnach die Erkenntnis zugrunde, die Schaufeln
Wie bereits erwähnt, dient zur individuellen Schwingungsanregung einer Schaufel
Abhängig von der konkreten geometrischen Abmessung einer zu überprüfenden Schaufel
Wie bereits ausgeführt, greift der Erreger
Mithilfe eines Sensors
Die Schwingungsanregung der jeweiligen zur Schwingung anzuregenden Schaufel
Wie bereits ausgeführt, werden vorzugsweise alle Schaufeln
Deutliche Abweichungen vom Mittelwert bis hin zu hohen Frequenzen oder kleinen Amplituden lassen auf eine gerissene oder möglicherweise gerissene Schaufel
Nur die Schaufeln
Als weitere Rissprüfung kann dann ein Farbpenetrationsverfahren oder ein Magnetflussverfahren zum Einsatz kommen, mithilfe dessen die Rissprüfung genauer bzw. detaillierter erfolgen kann.As a further crack test, a color penetration method or a magnetic flux method can then be used, by means of which the crack test can be carried out more precisely or in more detail.
Mithilfe des erfindungsgemäßen Verfahrens ist es demnach möglich, an einem ungereinigten Rotor einer Strömungsmaschine bei montierten Schaufeln
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1010
- Rotorrotor
- 1111
- RotorgrundkörperRotor body
- 1212
- Schaufelshovel
- 1313
- Erregerpathogen
- 1414
- Schaufelblattairfoil
- 1515
- Schaufelspitzeblade tip
- 1616
- Schwingungsgeneratorvibration generator
- 1717
- Jochyoke
- 1818
- Reiterequestrian
- 1919
- StrömungseintrittskanteFlow inlet edge
- 2020
- StrömungsaustrittskanteFlow outlet edge
- 2121
- Feststellschraubelocking screw
- 2222
- Abstandhalterspacer
- 2323
- Sensorsensor
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102005020469 A1 [0004, 0004] DE 102005020469 A1 [0004, 0004]
- EP 1610122 A1 [0004] EP 1610122 A1 [0004]
- DE 3530595 A1 [0004, 0004] DE 3530595 A1 [0004, 0004]
Claims (9)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910046804 DE102009046804A1 (en) | 2009-11-18 | 2009-11-18 | Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value |
CH13932010A CH702243B1 (en) | 2009-11-18 | 2010-08-26 | Method for crack detection on blades of a rotor of a turbomachine. |
KR1020100091117A KR101241526B1 (en) | 2009-11-18 | 2010-09-16 | Method for crack test at blades of rotor of turbo machine |
JP2010215267A JP5701555B2 (en) | 2009-11-18 | 2010-09-27 | Crack inspection method for rotor blades of turbo engines |
CN201010555907.6A CN102095803B (en) | 2009-11-18 | 2010-11-18 | For detecting the method for the crackle on turbine rotor blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910046804 DE102009046804A1 (en) | 2009-11-18 | 2009-11-18 | Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009046804A1 true DE102009046804A1 (en) | 2011-05-19 |
Family
ID=43877468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910046804 Withdrawn DE102009046804A1 (en) | 2009-11-18 | 2009-11-18 | Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP5701555B2 (en) |
KR (1) | KR101241526B1 (en) |
CN (1) | CN102095803B (en) |
CH (1) | CH702243B1 (en) |
DE (1) | DE102009046804A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020030364A1 (en) * | 2018-08-10 | 2020-02-13 | Siemens Aktiengesellschaft | Automated resonance test on multi-component components by means of pattern recognition |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9739167B2 (en) * | 2012-07-25 | 2017-08-22 | Siemens Energy, Inc. | Method and system for monitoring rotating blade health |
CN103630604B (en) * | 2012-08-29 | 2015-11-18 | 沈阳鼓风机集团股份有限公司 | The recognition methods of centrifugal compressor half-opened impeller crack fault |
KR101365573B1 (en) * | 2012-10-31 | 2014-02-21 | 주식회사 우진 | Method and system of detecting crack of wind turbine rotor blade |
CN103063742B (en) * | 2013-01-06 | 2016-02-10 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of surface wave in-situ method of detection of band coating spinner blade |
CN103592365B (en) * | 2013-11-14 | 2015-05-20 | 西安交通大学 | Rapid rotor crack detection method |
CN106197913B (en) * | 2016-08-30 | 2019-06-07 | 大唐东北电力试验研究院有限公司 | Wind electricity blade detection system |
Citations (7)
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JPS5934147A (en) * | 1982-08-20 | 1984-02-24 | Nissan Motor Co Ltd | Flaw detector for rotor blade |
DE3530595A1 (en) | 1985-08-27 | 1987-03-05 | Kraftwerk Union Ag | Method and device for ultrasonic testing of a turbine blade for incipient cracks in the blade base |
US6629463B2 (en) * | 2000-10-10 | 2003-10-07 | Snecma Moteurs | Acoustic inspection of one-piece bladed wheels |
DE102005020469A1 (en) | 2004-04-30 | 2005-11-24 | General Electric Co. | Method for ultrasound examination of blades |
EP1610122A1 (en) | 2004-06-01 | 2005-12-28 | Siemens Aktiengesellschaft | Method and apparatus for determination of defects in a turbine blade by means of an ultrasonic phased array transducer |
DE102006048791A1 (en) * | 2006-10-12 | 2008-04-17 | Rieth-Hoerst, Stefan, Dr. | Test object's e.g. turbine blade, quality testing method for e.g. aircraft engine, involves comparing recorded vibrations of object with pre-recorded vibrations of object or reference object, and evaluating comparison and data of vibrations |
DE102008052373A1 (en) * | 2008-10-20 | 2010-04-22 | Mtu Aero Engines Gmbh | Blade system's vibration behavior analyzing method for rotor of engine of airplane, involves calculating change of force acting on part of geometrical model, and determining resonance of part of model based on force change |
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JP2997485B2 (en) * | 1989-11-29 | 2000-01-11 | 株式会社日立製作所 | Ultrasonic inspection apparatus and probe setting method for ultrasonic inspection apparatus |
JP3254049B2 (en) * | 1993-07-05 | 2002-02-04 | セイコーインスツルメンツ株式会社 | Magnetic bearing type rotating machine |
JPH07208109A (en) * | 1994-01-14 | 1995-08-08 | Mitsubishi Heavy Ind Ltd | Rotational vibration testing device for blade |
JP3663609B2 (en) * | 1996-05-22 | 2005-06-22 | 石川島播磨重工業株式会社 | Gas turbine rotor blade fault diagnosis method and apparatus |
JP2003294716A (en) * | 2002-03-29 | 2003-10-15 | Hitachi Ltd | Turbine inspection method |
JP3874110B2 (en) * | 2002-08-30 | 2007-01-31 | 日本精工株式会社 | Abnormality diagnosis system |
KR100820764B1 (en) * | 2007-04-02 | 2008-04-11 | 안종국 | Nondestructive Testing Equipment for Turbine Blades |
CN101246369B (en) * | 2008-03-18 | 2011-08-10 | 东华大学 | Vehicle element size quality control system and method |
-
2009
- 2009-11-18 DE DE200910046804 patent/DE102009046804A1/en not_active Withdrawn
-
2010
- 2010-08-26 CH CH13932010A patent/CH702243B1/en not_active IP Right Cessation
- 2010-09-16 KR KR1020100091117A patent/KR101241526B1/en not_active Expired - Fee Related
- 2010-09-27 JP JP2010215267A patent/JP5701555B2/en not_active Expired - Fee Related
- 2010-11-18 CN CN201010555907.6A patent/CN102095803B/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5934147A (en) * | 1982-08-20 | 1984-02-24 | Nissan Motor Co Ltd | Flaw detector for rotor blade |
DE3530595A1 (en) | 1985-08-27 | 1987-03-05 | Kraftwerk Union Ag | Method and device for ultrasonic testing of a turbine blade for incipient cracks in the blade base |
US6629463B2 (en) * | 2000-10-10 | 2003-10-07 | Snecma Moteurs | Acoustic inspection of one-piece bladed wheels |
DE102005020469A1 (en) | 2004-04-30 | 2005-11-24 | General Electric Co. | Method for ultrasound examination of blades |
EP1610122A1 (en) | 2004-06-01 | 2005-12-28 | Siemens Aktiengesellschaft | Method and apparatus for determination of defects in a turbine blade by means of an ultrasonic phased array transducer |
DE102006048791A1 (en) * | 2006-10-12 | 2008-04-17 | Rieth-Hoerst, Stefan, Dr. | Test object's e.g. turbine blade, quality testing method for e.g. aircraft engine, involves comparing recorded vibrations of object with pre-recorded vibrations of object or reference object, and evaluating comparison and data of vibrations |
DE102008052373A1 (en) * | 2008-10-20 | 2010-04-22 | Mtu Aero Engines Gmbh | Blade system's vibration behavior analyzing method for rotor of engine of airplane, involves calculating change of force acting on part of geometrical model, and determining resonance of part of model based on force change |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020030364A1 (en) * | 2018-08-10 | 2020-02-13 | Siemens Aktiengesellschaft | Automated resonance test on multi-component components by means of pattern recognition |
Also Published As
Publication number | Publication date |
---|---|
KR101241526B1 (en) | 2013-03-11 |
CH702243B1 (en) | 2014-12-15 |
JP2011107127A (en) | 2011-06-02 |
CN102095803A (en) | 2011-06-15 |
CH702243A2 (en) | 2011-05-31 |
JP5701555B2 (en) | 2015-04-15 |
CN102095803B (en) | 2015-11-25 |
KR20110055374A (en) | 2011-05-25 |
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