INFLUENCE OF THERMAL AND MECHANICAL FACTORS ON THE STRESSED STATE OF LARGE COMPONENTS OF HYDROGENERATOR-MOTORS
|Journal||Journal of Mechanical Engineering|
|Publisher||A. Podgorny Institute for Mechanical Engineering Problems
National Academy of Science of Ukraine
|ISSN||0131-2928 (Print), 2411-0779 (Online)|
|Issue||Vol. 21, no. 3, 2018 (September)|
|Cited by||J. of Mech. Eng., 2018, vol. 21, no. 3, pp. 31-38|
Aleksey Tretyak, SE Plant Electrotyazhmash (299, Moskovsky ave, Kharkov, 61089, Ukraine), National Aerospace University ‘KhAI’ (17, Chkalov str., Kharkov, 61070, Ukraine), e-mail: email@example.com
Aleksandr Shut, SE Plant Electrotyazhmash (299, Moskovsky ave, Kharkov, 61089, Ukraine), e-mail: firstname.lastname@example.org
The work presented contains a detailed analysis of the existing ultimate power air-cooled hydrogenerator-motor design. It is shown that the umbrella-type hydrogenerator crosspiece perceives dynamic loads caused by forces acting in three planes. At the same time, to take them into account by analytical methods is impossible. In order to perform a three-dimensional calculation, it is necessary to take into account both the thermal and mechanical factors, as well as the specific features of the rolled metal. In the course of solving the problem set out above, taking into account thermal loads, a discrete crosspiece partition into the n-th number of sections is proposed. The convergence criterion for the solution to the inverse problem is based on maintaining the structure overall thermal balance, taking into account the limited accuracy of measuring devices. The main difference of the work was the justification of the choice of permissible stresses, taking into account the presence of bubbles in the metal structure, not exceeding their class of continuity for the selected rolled metal. It is proposed that an ‘elementary defect’ be introduced into the zone with the lowest safety margins as a circle with geometric data according to the restrictions on continuity. In this case, the correction of the selection of the finite element mesh parameters for the introduced defect is carried out as for the plate with eccentrically located holes. The mesh reduction continues to be carried out until the moment when the difference in the maximum stresses in the same mesh nodes is no more than 0.04%. Mechanical loads are specified in the classical formulation. In the course of the work it was found that the strength reserves of large generator components should be regulated by the quality of the rolled metal used, and the mechanical calculations should take into account thermal factors.
Keywords: hydrogenerator, mechanical stresses, thermal process, metal defects
Full text: Download in PDF
- Tretiak, O. V., Shut, O. Yu., & Trybushnoi, M. V. (2017). Analiz teplovoho stanu khrestovyny hidroheneratora – dvyhuna velykoyi potuzhnosti za osoblyvykh umov ekspluatatsii [Analysis of Heat State of Hydrogenerator Spider – Motor of High Power at Special Conditions of Operation]. Visnyk NTU «KhPI». Ser.: Enerhetychni ta Teplotekhnichni Protsesy i Ustatkuvannya − Bulletin of the NTU “KhPI”. Series: Power and Heat Engineering Processes and Equipment, no. 11 (1233), pp. 49–54 (in Ukrainian). https://doi.org/10.20998/2078-774X.2017.11.08
- Tretyak, A. V., Shut, A. Yu., Gakal, P. G., & Poliyenko, V. R. (2017). Osobennosti matematicheskogo modelirovaniya teplovogo sostoyaniya gidrogeneratorov kapsulnogo tipa [Features of mathematical modeling of the thermal state of the bulb type hydrogenerators]. Vіsn. NTU ‘KhPI’. Ser. Elektrichni Mashiny ta Elektromekhanichne Peretvorennia Enerhii − Bulletin of the NTU “KhPI”. Series: Power and Heat Engineering Processes and Equipment, no. 10 (1232), pp. 44-51 (in Russian). https://doi.org/10.20998/2078-774X.2017.10.06
- Krasnykh, V. Yu. & Korolev, V. N. (2012). Teplomassoobmen. Osnovnyye formuly, zadachi i sposoby ikh resheniya: sb. zadach [Heat and mass transfer. Basic formulas, problems and ways of their solution: problem collection]. Yekaterinburg: Ural Federal University, 64 p. (in Russian).
- Tekhnologiya proizvodstva metalloprokata. Defekt metalla ‘Rakoviny ot okaliny’ [Technology of production of rolled metal. Metal defect ‘Shells from dross’] Available at: http://metallopraktik.ru/novosti/defekt-metalla-rakovinyi-ot-okalinyi/ (accessed 5 July 2018) (in Russian).
Received 11 July 2018
Published 30 September 2018