The Vibration Characteristics of Steam Turbine Blades with New Friction Damping Structures

Abstract:

The hysteresis curves that show the relationship between the tangential friction force and relative displacement of the contact surface were measured. The equivalent stiffness and damping of the friction contact surface under different normal loads were computed by harmonic balance method (HBM). The finite element model of steam turbine blades with new friction damping structures was established. The effects of friction between the contact surfaces were considered by using spring damping elements to connect the friction damper and the blade. The equivalent stiffness and damping which were calculated by the experiment results were applied to the spring damping elements under different rotational speeds. Based on the natural frequencies which were computed by finite element analysis, the Campbell diagram of the whole blades was obtained. The results showed that there were no 3-coincide points in the working speed range.

• Periodical: Applied Mechanics and Materials (Volume 312)
• Pages: 268-272
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.312.268
• Online since: February 2013
• Authors: Jun Wu, Rui Shan Yuan, Peng Fei Zhao, Yong Hui Xie
• Keywords: Friction Damping Structure, Spring Damping Element, Steam Turbine Blade, Vibration

References

[1] Csaba, G. (1998). Modelling microslip friction damping and its influence on turbine blade vibrations. PhD thesis, Sweden, University of Linköping.

[2] Menq, C.H., Bielak, J. (1986). The Influence of Microslip on Vibratory Response, Part I: A New Microslip Model. In: Journal of Sound and Vibration, 107(2), 279- 293.

DOI: 10.1016/0022-460x(86)90238-5

[3] Filippi, S., Akay, S., Gola, M.M. (2004). Measurement of Tangential Contact Hysteresis During Microslip. In: Journal of Tribology, 126, 482-489.

DOI: 10.1115/1.1692030

[4] Koh, K.H., Griffin, J.H., Filippi, S., Akay, A. (2005). Characterization of Turbine Blade Friction Dampers. In: Journal of Engineering for Gas Turbines and Power, 127, 856-862.

DOI: 10.1115/1.1926312

[5] Wu, J., Zhang, M.H., Zhang, D. (2012). Experimental Study on Friction Damping Characteristics of Metallic Materials With Non-Conforming Contact. In: Applied Mechanics and Materials, 217-219, 2402-2405.

DOI: 10.4028/www.scientific.net/amm.217-219.2402

[6] Zhou, J.Q., Zhu, Y.Y. (1998). Nonlinear Vibration. Xi'an Jiaotong University Press, Xi'an (In Chinese).

[7] Xie, Y.H., Zhang, D. (2005). Numerical Model for Vibration Characteristic of Steam Turbine Blade With Damped Shroud. In: Proceedings of the CSEE, 25(18), 86-90 (In Chinese).

[8] Wu, J., Xie, Y.H., Zhang, D., Zhang, M.H. (2012). Experimental Friction Damping Characteristic of a Steam Turbine Blade Coupled by Shroud and Snubber at Standstill Set-up. In: Proceedings of ASME Turbo Expo. June 11-15, Copenhagen, Denmark, 69472.

DOI: 10.1115/gt2012-69472