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Koudelka Libor

Abstract

In the first quarter of the last century hydraulic power plants were equipped with high-speed Francis turbines even in the situation when a contemporary project manager would suggest Kaplan turbine. The reason is simple. Mr. Kaplan patented his turbine only in 1912 [1], https://en.wikipedia.org/wiki/Viktor_Kaplan . Those high-speed Francis turbines have just reached their lifetime. Mainly runners need repair. Our customers’ respond is that even renowned firms refuse to deliver runners with better parameters. Offer is to replace whole turbine with Kaplan or to make a copy of the existing runner. This paper presents experience and results of such a high-speed runner design. The runner substituted the one of Prokopa & sons from 1939 in powerhouse and mill at Křemže stream. Virtual prototyping technique has been used.

Open access

Peter Šlesar and Roland Jančo

- Strojnícky časopis 2017 (67), No. 2, pp. 77 - 84. [7] F. Trebuňa, F. Šimčák, Elasticity, strength and plasticity in mechanical engineering. Edition of scientific and special publications - Faculty of Mech. Eng. TU in Kosice, Emilena, Košice 2005. ISBN 80-8073-276-0. [8] F. Trebuňa, F. Šimčák, J. Bocko, and M. Pástor, Analysis of the Causes of Casting Pedestal Failures and the Measures for Increasing Their Residual Lifetime, Engineering Failure Analysis 2013 (29), 27 - 37.

Open access

Miroslav Pástor, Peter Frankovský, Martin Hagara and Pavol Lengvarský

REFERENCES [1] F. Trebuňa, F. Šimčák. Stability of the Mechanical System Elements (in Slovak), Košice, 2004 [2] F. Trebuňa, F. Šimčák, J. Bocko, M. Pástor. Analysis of the Causes of Casting Pedestal Failures and the Measures for Increasing Their Residual Lifetime. Engineering Failure Analysis 2013 (29), 27 – 37. [3] F. Trebuňa, et al. Final Report on the Examination of the Anchor Threaded Joints of the ZPO 2 Casting Pedestal (in Slovak). Košice 2014 . [4] Y. Nashwan. Experimental Strain Investigation of Bolt Torque Effect in

Open access

Miroslav Pástor, Peter Čarák and Imrich Gömöry

Causes of Casting Pedestal Failures and the Measures for Increasing Their Residual Lifetime”, Engineering Failure Analysis 29, pp. 27 – 37, 2013 . [12] Trebuňa, F., Šimčák, F., Pástor, M., Šarga, P. “Residual stress analysis in containers for transport of radioactive materials”, Applied Mechanics and Materials 732, pp. 28 – 31, 2015 . DOI: 10.4028/ www.scientific.net/AMM.732.28 [13] Hagara, M., Trebuňa, F., Pástor, M., Huňady, R., Lengvarský, P. “Analysis of the aspects of residual stresses quantification performed by 3D DIC combined with standardized