Dynamic Modeling and Experimental Verification on the Rotor-Armature Structure of a Steam Turbine-Generator Unit

Hassan Jalali; Farzad Rafieian; Hamed Haddad Khodaparast

doi:10.1016/j.apm.2022.03.009

Dynamic Modeling and Experimental Verification on the Rotor-Armature Structure of a Steam Turbine-Generator Unit

Hassan Jalali^*, Farzad Rafieian, Hamed Haddad Khodaparast

^*Corresponding author for this work

Mechanical and Construction Engineering

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Abstract

The rotor-armature structure of an exciter rotor used in a steam turbine-generator unit is investigated in this work. The objective is to create a base verified linear dynamic model of the exciter rotor for fault diagnosis or nonlinear interactions analysis. Natural frequencies for the rotor-armature structure are obtained from modal testing in free-free conditions. An analytical model for the structure is then constructed using Timoshenko beam theory, in which the linear effect of contact interface between rotor and armature is included. The unknown parameters of the rotor-armature model are identified by comparing analytical and experimental results. The verified dynamic model serves as the base for fault diagnosis and nonlinear response analysis due to the rotor and armature interactions.

Original language	English
Pages (from-to)	802-814
Number of pages	13
Journal	Applied Mathematical Modelling
Volume	107
Early online date	1 Apr 2022
DOIs	https://doi.org/10.1016/j.apm.2022.03.009
Publication status	Published - 1 Jul 2022

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10.1016/j.apm.2022.03.009Licence: CC BY

Paper_31Jan2022Accepted author manuscript, 871 KBLicence: CC BY-NC-ND

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title = "Dynamic Modeling and Experimental Verification on the Rotor-Armature Structure of a Steam Turbine-Generator Unit",

abstract = "The rotor-armature structure of an exciter rotor used in a steam turbine-generator unit is investigated in this work. The objective is to create a base verified linear dynamic model of the exciter rotor for fault diagnosis or nonlinear interactions analysis. Natural frequencies for the rotor-armature structure are obtained from modal testing in free-free conditions. An analytical model for the structure is then constructed using Timoshenko beam theory, in which the linear effect of contact interface between rotor and armature is included. The unknown parameters of the rotor-armature model are identified by comparing analytical and experimental results. The verified dynamic model serves as the base for fault diagnosis and nonlinear response analysis due to the rotor and armature interactions.",

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author = "Hassan Jalali and Farzad Rafieian and Khodaparast, {Hamed Haddad}",

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T1 - Dynamic Modeling and Experimental Verification on the Rotor-Armature Structure of a Steam Turbine-Generator Unit

AU - Jalali, Hassan

AU - Rafieian, Farzad

AU - Khodaparast, Hamed Haddad

PY - 2022/7/1

Y1 - 2022/7/1

N2 - The rotor-armature structure of an exciter rotor used in a steam turbine-generator unit is investigated in this work. The objective is to create a base verified linear dynamic model of the exciter rotor for fault diagnosis or nonlinear interactions analysis. Natural frequencies for the rotor-armature structure are obtained from modal testing in free-free conditions. An analytical model for the structure is then constructed using Timoshenko beam theory, in which the linear effect of contact interface between rotor and armature is included. The unknown parameters of the rotor-armature model are identified by comparing analytical and experimental results. The verified dynamic model serves as the base for fault diagnosis and nonlinear response analysis due to the rotor and armature interactions.

AB - The rotor-armature structure of an exciter rotor used in a steam turbine-generator unit is investigated in this work. The objective is to create a base verified linear dynamic model of the exciter rotor for fault diagnosis or nonlinear interactions analysis. Natural frequencies for the rotor-armature structure are obtained from modal testing in free-free conditions. An analytical model for the structure is then constructed using Timoshenko beam theory, in which the linear effect of contact interface between rotor and armature is included. The unknown parameters of the rotor-armature model are identified by comparing analytical and experimental results. The verified dynamic model serves as the base for fault diagnosis and nonlinear response analysis due to the rotor and armature interactions.

KW - Dynamic characteristic

KW - Parameter identification

KW - Rotor-armature

KW - Structural modeling

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U2 - 10.1016/j.apm.2022.03.009

DO - 10.1016/j.apm.2022.03.009

M3 - Article

SN - 0307-904X

VL - 107

SP - 802

EP - 814

JO - Applied Mathematical Modelling

JF - Applied Mathematical Modelling

ER -

Dynamic Modeling and Experimental Verification on the Rotor-Armature Structure of a Steam Turbine-Generator Unit

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