An Increase in the Energy Efficiency of Axial Turbines by Ensuring Vibration Reliability of Blade Milling
Ivan Pavlenko,
Serhii Kononenko,
Krystian Czernek,
Stanisław Witczak,
Sergey Dobrotvorskiy,
Yevhenia Basova,
Vitalii Ivanov,
Andżelika Krupińska,
Magdalena Matuszak,
Sylwia Włodarczak,
Marek Ochowiak
Affiliations
Ivan Pavlenko
Faculty of Technical Systems and Energy Efficient Technologies, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine
Serhii Kononenko
Department of Technology of Mechanical Engineering and Metal-Cutting Machine Tools, National Technical University “Kharkiv Polytechnic Institute”, 2, Kyrpychova St., 61002 Kharkiv, Ukraine
Krystian Czernek
Department of Process and Environmental Engineering, Opole University of Technology, 76 Prószkowska Str., 45-758 Opole, Poland
Stanisław Witczak
Department of Process and Environmental Engineering, Opole University of Technology, 76 Prószkowska Str., 45-758 Opole, Poland
Sergey Dobrotvorskiy
Department of Technology of Mechanical Engineering and Metal-Cutting Machine Tools, National Technical University “Kharkiv Polytechnic Institute”, 2, Kyrpychova St., 61002 Kharkiv, Ukraine
Yevhenia Basova
Department of Technology of Mechanical Engineering and Metal-Cutting Machine Tools, National Technical University “Kharkiv Polytechnic Institute”, 2, Kyrpychova St., 61002 Kharkiv, Ukraine
Vitalii Ivanov
Faculty of Technical Systems and Energy Efficient Technologies, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine
Andżelika Krupińska
Department of Chemical Engineering and Equipment, Poznan University of Technology, 5, M. Sklodowskej-Curie Sq., 60-965 Poznan, Poland
Magdalena Matuszak
Department of Chemical Engineering and Equipment, Poznan University of Technology, 5, M. Sklodowskej-Curie Sq., 60-965 Poznan, Poland
Sylwia Włodarczak
Department of Chemical Engineering and Equipment, Poznan University of Technology, 5, M. Sklodowskej-Curie Sq., 60-965 Poznan, Poland
Marek Ochowiak
Department of Chemical Engineering and Equipment, Poznan University of Technology, 5, M. Sklodowskej-Curie Sq., 60-965 Poznan, Poland
Ensuring the vibration reliability of power equipment is one of the fundamental problems in modern power machinery. This problem has become more critical due to a permanent increase in the machining performance of high-speed milling of axial turbine blades. This article aims to identify reliable vibration parameters for high-speed milling of turbine blades to increase the energy efficiency of gas and steam turbines. For this purpose, mathematical models of free and forced oscillations of turbine blades during machining were developed. As a result of considering experimental and finite element analysis data, critical frequencies and corresponding mode shapes of free oscillations were identified using regression procedures by the best fit of analytical and empirical approaches. Additionally, after considering the forced oscillations of blades during high-speed machining, the magnitude of the specific cutting force and external damping ratio in the system ‘axial turbine blade and milling head’ were evaluated. The resulting magnitude of forced oscillations during machining was calculated. Finally, the amplitude–frequency response was also assessed, considering the machining parameters. Overall, the proposed methodology increases energy efficiency due to a decrease in the obtained machining quality of turbine blades.
