Elektrane (2025) [pp. 221-229]
AUTHOR(S) / AUTOR(I): Radomir Radiša, Pavle Stepanić, Ivana Vasović, Aleksandar Stepanović, Srećko Manasijević
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DOI: https://doi.org/10.46793/EEP25.221
ABSTRACT / SAŽETAK:
Maintenance of components of the hydroelectric power plant system is essential for the safe and secure operation of the entire plant. A key role is played by analyzing the remaining service life of machine parts that are still in operation and must be replaced before final breakage, which would cause the system to fail. A detailed and comprehensive analysis of the system elements can prevent high costs or intangible losses that may result from failures or breakages of machine parts in the hydroelectric power plant. To efficiently replace worn and damaged parts and produce new ones, the maintenance section of HPP Djerdap 1 uses the LITOSTROJ PD 2000-6000 SM lathe. This lathe can process large machine parts, such as turbine blade sleeves. The subject of this paper is the analysis and reconstruction of a lathe that causes inadequate bearing of the turbine blade due to inaccurate machining. The existing solution did not meet the quality and tolerance requirements for the treated surfaces because it failed to achieve the required geometry and precision in turbine blade processing. By analyzing the existing solution and accounting for possible reconstruction limitations, a solution with existing radial bearings and their stiffening is presented. Through the research, a newly designed bearing with bearings that carry both types of loads (radial and axial) was proposed. The original solution with two bearings that were not sufficiently stiffened required refinements to the housing and the rings that define the bearings’ positions. The research results are presented in the paper, and their validity has been confirmed through experimentation, component installation, and the reconstruction of the machine, which was later improved to achieve the required operating parameters.
KEYWORDS / KLJUČNE REČI:
turbine blades, maintenance, valuation of remaining life, lathe
ACKNOWLEDGEMENT / PROJEKAT:
REFERENCES / LITERATURA:
- LOLA INSTITUT, Interna dokumentacija LOLA INSTITUT-a.
- Jovanović, M. (2015). Održavanje mašinskih sistema. Mašinski fakultet, Univerzitet u Beogradu.
- Smith, A. M., & Hinchcliffe, G. (2004). RCM – Gateway to World Class Maintenance. Elsevier. [4] Mobley, R. K. (2002). An Introduction to Predictive Maintenance. Butterworth-Heinemann.
- Jardine, A. K. S., Lin, D., & Banjevic, D. (2006). A Review on Machinery Diagnostics and Prognostics Implementing Condition-Based Maintenance. Mechanical Systems and Signal Processing, 20(7).
- Milošević, M. (2012). Tehnologija obrade rezanjem. Mašinski fakultet, Univerzitet u Nišu.
- Kalpakjian, S., & Schmid, S. (2014). Manufacturing Engineering and Technology (7th ed.). Pearson.
- Boothroyd, G., & Knight, W. A. (2005). Fundamentals of Machining and Machine Tools. CRC Press.
- Kožuh, S. (2009). Rekonstrukcija i modernizacija alatnih mašina. Mašinski fakultet, Univerzitet u Mariboru.
- Škunca, S. (2008). Elementi mašina I i II. Mašinski fakultet, Univerzitet u Beogradu.
- Harris, T. A., & Kotzalas, M. N. (2006). Rolling Bearing Analysis. CRC Press.
- Childs, P. R. N. (2014). Mechanical Design Engineering Handbook. Butterworth-Heinemann.
- Popović, V. (2011). Konstrukcija mašina. Univerzitet u Novom Sadu, Fakultet tehničkih nauka. [14] Čepin, M. (2013). Assessment of Power System Reliability: Methods and Applications. Springer.
- Mosonyi, E. (1991). Water Power Development: Volume II, Low Head Power Plants. Akadémiai Kiadó.
- ISO 281: Rolling bearings – Dynamic load ratings and rating life.
- ISO 1101: Geometrical Product Specifications (GPS) – Geometrical tolerancing – Tolerances of form, orientation, location and run-out.
- Tavner, L. Ran, J. Penman, H. Sedding (2008) Conditon Monitoring of Rotating Electrical Machines. The Institution of Engineering and Technology, London, United Kingdom