Abstract
The dynamic characteristics of the rotor-bearing system for micro-gas turbine are the key factors that affect the safe and stable operation of the micro-gas turbine. This paper carried out the experimental investigations on the vibration characteristics during the speed-up process of rotating shaft, based on rotor structure of micro gas turbine generator supported by aerostatic bearings. Rotor vibration characteristics during conical whirling critical speed area, mixed control area, surge area, self-holding speed area, and bending critical speed area were analyzed. Simultaneously effects of bearing supply pressure and radial clearance on the shaft vibration characteristics were studied by experiments. The results showed that the ignition fuel flow has stepped increase when the ignition fuel valve was opened, which caused easily the rotor and bearing rubbing. And the reasonable bearing radial clearance and gas supply pressure can effectively restrain the occurring of the low frequency whirling and gas film oscillation, and improve the bearing-rotor system stability.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Castelli V, Elrod HG (1965) Solution of the stability problem for 360 degree self-acting, gas-lubricated Bearing. ASME J Basic Eng 87:199–212
Jorgen W, The L (1965) Stability of an elastic rotor in journal bearings with flexible, damped supports. J Appl Mech 32(4):911
Ehrich FF (1966) Sub-harmonic Vibration of Rotors in Bearing Clearance. ASME Paper. No. 66-MD-1
Ehrich FF (1991) Some observations of chaotic vibration phenomena in high speed rotor dynamics. Trans. ASME. J Vib Acoust 113:51–60
Pirogova NS, Taranenko PA (2015) Calculative and experimental analysis of natural and critical frequencies and mode shapes of high-speed rotor for micro gas turbine plant. Procedia Eng 129:997–1004
Kim D, An SL, Choi BS (2014) Evaluation of foil bearing performance and nonlinear rotordynamics of 120 kW oil-free gas turbine generator. J Eng Gas Turbines Power-Trans ASME 136(3):032504
Park CH, Choi SK, Ham SY (2011) Design and experiment of 400,000 rpm high speed rotor and bearings for 500 W class micro gas turbine generator. In: Proceedings pf PowerMEMS, Daejeon, p 1–4
Seo JM, Park JY, Seog Choi B (2013) Start-up and self-sustain test of 500 W ultra-micro gas turbine generator. In: Journal of physics: conference series. IOP Publishing, vol 476(1), p 012060
Hong DK, Joo DS, Woo BC et al (2014) Unbalance response analysis and experimental validation of an ultra high speed motor-generator for microturbine generators considering balancing. Sensors 14(9):16117–16127
Guo D, Chu F, Chen D (2002) The unbalanced magnetic pull and its effects on vibration in a three-phase generator with eccentric rotor. J Sound Vib 254(2):297–312
Morosi S, Santos IF (2011) Active lubrication applied to radial gas journal bearings. Part 1: modeling. Tribol Int 44(12):1949–1958
Morosi S, Santos IF (2011) On the modelling of hybrid aerostatic-gas journal bearings. Proc Inst of Mech Eng Part J: J Eng Tribol 225(7):641–653
Lai T, Chen S, Ma B et al (2014) Effects of bearing clearance and supporting stiffness on performances of rotor-bearing system with multi-decked protuberant gas foil journal bearing. Proc Inst of Mech Eng Part J J Eng Tribol 228(7):780–788
Sinha SK (2004) Dynamic characteristics of a flexible bladed-rotor with Coulomb damping due to tip-rub. J Sound Vib 273(4–5):875–919
Yan S, Dowell EH, Lin B (2014) Effects of nonlinear damping suspension on nonperiodic motions of a flexible rotor in journal bearings. Nonlinear Dyn 78(2):1435–1450
Acknowledgment
The work is supported by National Natural Science Foundation (Grant No.11602268), and the support is gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Switzerland AG
About this paper
Cite this paper
Han, D., Hao, L., Yang, J. (2019). Experimental Investigations on Vibration Characteristics for Bearing-Rotor System of Micro Gas Turbine. In: Cavalca, K., Weber, H. (eds) Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM. IFToMM 2018. Mechanisms and Machine Science, vol 63. Springer, Cham. https://doi.org/10.1007/978-3-319-99272-3_24
Download citation
DOI: https://doi.org/10.1007/978-3-319-99272-3_24
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-99271-6
Online ISBN: 978-3-319-99272-3
eBook Packages: EngineeringEngineering (R0)