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Shape optimization of new circumferential steam turbine blade attachment type
Mívalt, Tomáš ; Petruška, Jindřich (referee) ; Polzer, Stanislav (advisor)
This thesis describes selection and shows calibration of material model, capable of describing cyclic softening of material. Stress-strain FEM analysis of circumferential blade attachment for last section of rotor blades of steam turbine is performed, expected lifetime of existing attachment is evaluated. Multi-parameter optimization of new-shape attachment was done, resulting in dimensions for new-shape attachment with longer lifetime. Improvements in strain amount in comparison with existing attachment were evaluated and possible RPM increase of turbine with new attachment type was calculated.
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Stress-strain analysis of axisymmetric body solved by analytical and numerical approaches
Mívalt, Tomáš ; Petruška, Jindřich (referee) ; Novák, Kamil (advisor)
The bachelor’s thesis deals with stress-strain analysis of axisymmetric body. As suitable axisymmetric body was chosen combustion engine piston. Thesis includes study of piston loads and possibilities of stress-strain calculations. This is followed by research in field of historical approaches of stress-strain calculations and tension evaluating and classification. In the practical part of thesis, analytical solution was solved with different computational models – fixed plate, supported plate and composite body – composed of shell and plate. After solving analytical models, numerical approach took place; FEM with different resolutions was used in ANSYS system. In conclusion of the thesis, all data and result were compared and appropriate conclusions were made.
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Shape optimization of new circumferential steam turbine blade attachment type
Mívalt, Tomáš ; Petruška, Jindřich (referee) ; Polzer, Stanislav (advisor)
This thesis describes selection and shows calibration of material model, capable of describing cyclic softening of material. Stress-strain FEM analysis of circumferential blade attachment for last section of rotor blades of steam turbine is performed, expected lifetime of existing attachment is evaluated. Multi-parameter optimization of new-shape attachment was done, resulting in dimensions for new-shape attachment with longer lifetime. Improvements in strain amount in comparison with existing attachment were evaluated and possible RPM increase of turbine with new attachment type was calculated.
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|
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Stress-strain analysis of axisymmetric body solved by analytical and numerical approaches
Mívalt, Tomáš ; Petruška, Jindřich (referee) ; Novák, Kamil (advisor)
The bachelor’s thesis deals with stress-strain analysis of axisymmetric body. As suitable axisymmetric body was chosen combustion engine piston. Thesis includes study of piston loads and possibilities of stress-strain calculations. This is followed by research in field of historical approaches of stress-strain calculations and tension evaluating and classification. In the practical part of thesis, analytical solution was solved with different computational models – fixed plate, supported plate and composite body – composed of shell and plate. After solving analytical models, numerical approach took place; FEM with different resolutions was used in ANSYS system. In conclusion of the thesis, all data and result were compared and appropriate conclusions were made.
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