3D Solid Finite Element Modeling and Rotordynamics of Large Rotating Machines: Application to an Industrial Turbo Engine

Abstract:

An industrial turbo engine is modeled and meshed in ANSYS using solid elements. A rotordynamic analysis of the selected parts of the turbo engine is performed. For the unbalance response prediction, a novel method for modeling unbalance in 3D solid rotor model is presented and validated using a simple rotor model. In order to reduce the model order degree, transfer functions of the casing and bearings are generated and incorporated into the rotor-bearing system to account for the influence of elastic support stiffness on the rotor system. Modal and unbalance response analysis is performed on the 3D solid finite element rotor-bearing model using the unbalance modeling method presented in this paper. The results obtained from modal and unbalance analysis are compared and discussed.

• Periodical: Advanced Materials Research (Volumes 591-593)
• Pages: 1879-1885
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.591-593.1879
• Online since: November 2012
• Authors: Wei Meng Ma, Jian Jun Wang
• Keywords: 3D Solid Model, Dynamic Stiffness, Harmonic Response, Rotordynamics, Unbalance Force

References

[1] J.S. Rao, A.K. Singh and S. Narayana, Dynamic Analysis of Combined Rotor-Bearing-Foundation System, ASME IGTI PWP, Amsterdam, June (2002).

[2] J.S. Kubany, J.A. Tecza and P. Gustafsson, Dynamic evaluation of a three point mount baseplate for a motor driven, centrifugal compressor package, Proceedings of the ASME 2003 Design Engineering Technical Conferences and Computers and Information in Engineering Conference (Chicago, Illinois, September2-6, 2003).

DOI: 10.1115/detc2003/vib-48463

[3] J.S. Rao and R. Sreenivas, Dynamics of a three level rotor system using solid elements, GT2003-38783.

[4] J.S. Rao, Rotor Dynamics Comes of Age, Keynote address, Sixth IFToMM International Conference Rotor Dynamics (Sydney, September 30-October 3, 2002). Vol. I, p.15.

[5] D. Combescure, A. Lazarus, Refined finite element modelling for the vibration analysis of large rotating machines: Application to the gas turbine modular helium reactor power conversion unit. Journal of Sound and Vibration, Vol. 318 (2008).

DOI: 10.1016/j.jsv.2008.04.025

[6] J.S. Rao and R. Sreenivas, Dynamics of Asymmetric Rotors using Solid Models, Proceedings of the International Gas Turbine Congress 2003 Tokyo, IGTC2003Tokyo TS-016.

[7] J.J. Moore, G. Vannini, M. Camatti and P. Bianchi, Rotordynamic Analysis of a Large Industrial Turbo-Compressor Including Finite Element Substructure Modeling, ASME Turbo Expo 2006: Power for Land, Sea and Air(Barcelona, Spain, May 8-11, 2006).

DOI: 10.1115/gt2006-90481

[8] ANSYS Version 12. 0 (classic and workbench), ANSYS, Inc.

[9] J. Hong, H. Wang, D.W. Xiao and M. Chen, Effects of Dynamic Stiffness of Rotor Bearing on Rotordynamic Characteristics. Aeroengine, Vol. 34 (2008) No. 1, p.23. (In Chinese).