G4 Doctoral dissertation (monograph)

Dynamic analysis of rotating systems including contact and thermal­-induced effects


Open Access publication

Publication Details
Authors: Sikanen Eerik
Publisher: Lappeenranta University of Technology
Publishing place: Lappeenranta
Publication year: 2018
Language: English
ISBN: 978-952-335-284-1
eISBN: 978-952-335-285-8
JUFO-Level of this publication:
Permanent website address: http://urn.fi/URN:ISBN:978-952-335-285-8
Open Access: Open Access publication

Abstract

Rotor dynamics is a special field of structural dynamics focusing on the study and analysis of rotating structures. Practical applications for rotor dynamics are found in typical industrial rotating electrical machine design. High-speed technology introduced new challenges for mechanical design of rotating machines. In addition to structural strength analysis, vibration issues due to critical speeds (CSs) typically occur in rotating machinery, which is one of the main research topics in the field of rotor dynamics. Alongside vibrations, thermal loads as heat losses from electrical machines or from process cycle can contribute to the stress state of the rotating structure in a form of thermal stress.

In this doctoral dissertation, the use of three-dimensional (3D) solid finite element (FE) theory for modeling rotating structures in the field of rotor dynamics is studied. A brief history of the use of finite element method (FEM) in the field of rotor dynamics is provided. In comparison to the traditional beam element approach, the new phenomena that can be studied by the use of the solid finite element method are introduced and studied. Capability of modeling of complex rotors of high-speed motors with complex geometric properties accurately arises when using the 3D solid element modeling approach. Additional features such as body force; for example, centrifugal force, stress stiffening and thermal effects, can be included in the model of the rotating system. Custom contact modeling for the structural analysis of rotating structures is utilized, along with custom coupled field solution routines.


Last updated on 2019-13-03 at 12:00

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