The present work is focused on the pneumatic hammer instability in an aerostatic bearing with shallow recesses and orifices of four different diameters. Operating conditions were zero rotation speed, zero load, and different supply pressures. The diameters of the tested orifices were large compared to the usual practice and correspond to a combined inherent and orifice restriction. The theoretical analysis was based on the computational fluid dynamics (CFD) evaluation of the ratio between the recess and the feeding pressure and on the “bulk flow” calculation of the rotordynamic coefficients of the aerostatic bearing. Calculations showed an increase of the direct stiffness with decreasing the orifice diameter and increasing the supply pressure and, on the other hand, a decrease toward negative values of the direct damping with decreasing the orifice diameter. These negative values of the direct damping coefficient indicate pneumatic hammer instabilities. In parallel, experiments were performed on a floating bearing test rig. Direct stiffness and damping coefficients were identified from multiple frequency excitations applied by a single shaker. Experiments were performed only for the three largest orifices and confirmed the decrease of the direct damping with the orifice diameter and the supply pressure. The identification of the rotordynamic coefficients was not possible for the smallest available orifice because the aerostatic bearing showed self-sustained vibrations for all feeding pressures. These self-sustained vibrations are considered the signature of the pneumatic hammer instability. The paper demonstrates that aerostatic bearings with shallow recesses and free of pneumatic hammer instabilities can be designed by adopting orifice restrictors of large size diameter.
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February 2016
Research-Article
Synthesis of Experimental and Theoretical Analysis of Pneumatic Hammer Instability in an Aerostatic Bearing
Mihai Arghir,
Mihai Arghir
PPRIME Institute,
UPR CNRS 3346,
Université de Poitiers, ENSMA ISAE, Chasseneuil Futuroscope 86962, France
UPR CNRS 3346,
Université de Poitiers, ENSMA ISAE, Chasseneuil Futuroscope 86962, France
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Mohamed-Amine Hassini,
Mohamed-Amine Hassini
Centre National d'Etudes Spatiales,
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
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Franck Balducchi,
Franck Balducchi
Centre National d'Etudes Spatiales,
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
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Romain Gauthier
Romain Gauthier
SNECMA,
Division Moteurs Spatiaux,
Vernon 27208, France
Division Moteurs Spatiaux,
Vernon 27208, France
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Mihai Arghir
PPRIME Institute,
UPR CNRS 3346,
Université de Poitiers, ENSMA ISAE, Chasseneuil Futuroscope 86962, France
UPR CNRS 3346,
Université de Poitiers, ENSMA ISAE, Chasseneuil Futuroscope 86962, France
Mohamed-Amine Hassini
Centre National d'Etudes Spatiales,
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
Franck Balducchi
Centre National d'Etudes Spatiales,
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
PPRIME Institute,
Université de Poitiers,
Poitiers 86000, France
Romain Gauthier
SNECMA,
Division Moteurs Spatiaux,
Vernon 27208, France
Division Moteurs Spatiaux,
Vernon 27208, France
1Present address: EDF Recherche et Développement, Clamart 92141, France.
2Present address: Hutchinson Stop-Choc Ltd., Banbury Avenue, Slough SL1 4LR, UK.
Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 20, 2015; final manuscript received August 5, 2015; published online September 1, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Feb 2016, 138(2): 021602 (8 pages)
Published Online: September 1, 2015
Article history
Received:
July 20, 2015
Revision Received:
August 5, 2015
Citation
Arghir, M., Hassini, M., Balducchi, F., and Gauthier, R. (September 1, 2015). "Synthesis of Experimental and Theoretical Analysis of Pneumatic Hammer Instability in an Aerostatic Bearing." ASME. J. Eng. Gas Turbines Power. February 2016; 138(2): 021602. https://doi.org/10.1115/1.4031322
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