Misiura S. Analysis of stress-strain state and vibrations of hydro turbine covers and their optimal design

The object of research is a stress-strain state (SSS) and natural oscillations of the covers of radial-axial and adjustable-blade hydraulic turbines. The aim of research is to develop models and methods for complex SSS research of the covers of radial-axial and adjustable-blade hydraulic turbines, determine their vibration characteristics with the influence of environment and optimal design of covers with reduced weight and stress levels. Research methods - finite element method, methods of optimal design, numerical methods. Developed models and methods of SSS analysis take into account the water pressure, weight load of equipment that is mounted on the cover, have a theoretical value for SSS analysis of actual designs of hydraulic turbine covers. Practical significance of the results is that they can be used in organizations that design and produce hydraulic turbines. The novelty of the results is in development of new models for complex SSS research of the covers of radial-axial and adjustable-blade turbines, which, in contrast to existing models, are the thin-walled elements and taking into account external load from water pressure and weight of attachable equipment and geometric features of construction. The research results were used for the analysis of static strength, calculation of natural frequencies and optimization of covers for hydraulic turbines of OJSC "Turboatom" and LLC "Kharkivturboengineering." Areas of use - energetics, turbine manufacture