10.14489/td.2015.01.pp.052-060

2015, 01 January

DOI: 10.14489/td.2015.01.pp.052-060

Posadov V.V., Posadov V.V. (jr.), Firsov A.V.
PREDICTION AND DIAGNOSTICS OF AIRCRAFT GAS TURBINE ENGINE COMPRESSOR FLUTTER
(pp. 52-60)

Abstract. This paper describes method of flutter (on gas turbine engine fan) forecast based on its amplitude-frequency characteristics (received from tests); and also method of flutter diagnostics based on vibration speed signal raise value (on frequency of diagnostic). Described results of experimental research and applied diagnostic program show that it is reasonable to use vibration accelerometer as sensing device for flutter diagnostics. To recognize accurately flutter presence, vibrations threshold on frequency of diagnostic was used. This threshold was determined experimentally. In this case vibration speed was selected as vibration criterion as it’s amplitude changes slightly when rotating frequency changes. Based on this criterion it is possible to determine universal threshold for vibration level on the frequency of diagnostic for all engine operation modes where flutter can occur. This paper also presents flutter diagnostics method based on probabilistic characteristics of vibroacoustic signal. Diagnostics program was developed and approved during engine tests.

Keywords: flutter, forecast, diagnostics, fan blade, compressor, gas furbine engine.

+ - About the Authors Click to collapse

V. V. Posadov, V. V. Posadov (jr.), A. V. Firsov
JSC “NPO “Saturn”, Rybinsk, Russia. E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Kurkov A., Dicus J. (1978). Synthesis of Blade Flutter Vibratory Patterns Using Stationary Transducers. ASME Paper N78-GT-160. Apr.
2. Kuzmenko M. L., Mikhailov A. L., Posadov V. V., Posadova O. L. (2008). Criteria of vibrodiagnostics of self-oscillations of the blades of the fan power based on meas-urements of the hull vibrations. Kontrol'. Diagnostika, (1), pp. 20-24.
3. Posadova O. L., Posadov V. V. The diagnostic meth-od of self-oscillations of the turbomachine’s impeller. Ru Patent No. 2411484. Russian Federation.
4. Condition monitoring and diagnostics of machines. Vibration condition monitoring of machines. Part 2. Processing, analysis and presentation of results of vibration measurements. (2009). Ru Standard No GOST R ISO 13373-1-2009. Russian Federation. Moscow.
5. Posadov V. V. (ml.), Posadov V.V. Diagnosis of non-stationary processes during benchmark testing of gas turbine engine. Proceedings of the conference «Klimovsky readings – 2013», pp. 110-118.
6. Posadov V. V., Firsov A. V., Posadov V. V. Method for the diagnosis of oscillation of the turbomachine’s impel-ler. Ru Patent No. 2511773. Russian Federation.
7. Posadov V. V. (ml.), Posadov V.V. The method of calculating non-stationary processes in gas turbine engine. Certificate of authorship on computer programm No. 2013619784. Russian Federation.

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