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Study of the influence of blades arrangement \\ on the mode shapes and stress scatter

Marco Convertini

Study of the influence of blades arrangement \\ on the mode shapes and stress scatter.

Rel. Daniele Botto. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Aerospaziale, 2018

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Abstract:

The purpose of this project is to investigate the influence of different mistuned blades arrangements on free-vibration response and dynamics of bladed disk. This rotor belongs to the first stage of the Low Pressure Compressor (LPC) in the NK-36ST engine, used as Gas Turbine Unit. Firstly, will be analyzed the influence of different mistuned patterns on mode shapes and natural frequencies. Then, a finite elements model of the LPC will be created and a CFD simulation run in order to evaluate the exciting aerodynamic force acting on each blade. The estimated force, written in harmonic form in function of Engine Order and time, will be used to excite blades in a transient structural analysis so as to minimize stress scatter and find the best mistuned arrangement.

Relators: Daniele Botto
Academic year: 2017/18
Publication type: Electronic
Number of Pages: 110
Subjects:
Corso di laurea: Corso di laurea magistrale in Ingegneria Aerospaziale
Classe di laurea: New organization > Master science > LM-20 - AEROSPATIAL AND ASTRONAUTIC ENGINEERING
Ente in cotutela: Samara State University (RUSSIA)
Aziende collaboratrici: UNSPECIFIED
URI: http://webthesis.biblio.polito.it/id/eprint/8058
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