Modal Analysis of Compressor Impeller with Crack and Blade Fracture

Abstract:

The research of impeller dynamic characteristics by modal analysis technology is a kind of practical and effective fault diagnosis method, which has the vital significance to realize the security of machinery. Crack and blade fracture often occur in centrifugal compressor impeller. In order to study the impeller dynamic characteristic with crack and the blade fracture, a three-dimension finite element model (FEM) was built using ANSYS program, and an experimental modal analysis was also carried out. The compared results show that the preceding four orders natural frequencies and vibration models are basically consistent, and those also verified the reliability of the simulation results. In addition, two kinds of failure mode were also simulated, such as crack and blade fracture. It concluded that all orders natural frequencies decrease clearly, compared with the normal impeller. How the severity of crack and blade fracture affects the natural frequency was also discussed.

• Periodical: Advanced Materials Research (Volumes 712-715)
• Pages: 1018-1021
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.712-715.1018
• Online since: June 2013
• Authors: Mei Jiao Li, Hua Qing Wang*, Wei Min Wang
• Keywords: Blade Fracture, Crack, Finite Element Method (FEM), Impeller, Modal Analysis

References

[1] Haichao Zhou, Yanyan Zuo, Xiaolin Bao: Noise and Vibration Control Vol. 12(2010), p.63 (In Chinese).

[2] Jiping Zhang: Coal Mine Machinery Vol. 11(2008), p.1 (In Chinese).

[3] Gwo-Chung Tsai: Journal of Sound and Vibration Vol. 271(2004), p.547

[4] Nicholas White, Scot Laney, Cory Zorzi: RCFA for recurring Impeller Failures in a 4.7Mtpa LNG Train Propane Compressor(Proceedings of the Fortieth Turbo machinery Symposium, Houston 2011).

[5] Mehdi Tofighi Naeem, Seyed Ali Jazayeri, Nesa Rezamahdi: Failure Analysis of Gas Turbine Blades(Proceedings of The 2008 IAJC-IJME International Conference,2008).