Modal analysis of asymmetric rotor with anisotropic stator using modulated coordinates = 변조좌표계를 활용한 비대칭/비등방 회전체의 모드해석기법

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Modern rotating machines have a tendency to increase capacity, reduce weight and obtain high operating speed. So the machines become more and more sophisticated and intelligent ever. But still there exists many factors not recognized by modeling techniques of the entire rotor system. Even for a carefully designed rotating machinery having high performance, broad stability with highly qualified materials, unexpected excessive vibrations may be produced and eventually result in fatigue failure or damage during their operating life. Therefore, early stage preventive detection for the system faults becomes increasingly important. Many monitoring methods for early detection of symptoms for various failure modes are developed until now. But they do not clearly match the needs of the industry, because the time-varying parameter in the model of the rotors are not modeled adequately. In this research work, a new modeling and modal analysis method for rotor systems usable in industry is proposed for the purpose of innovation of the theoretical technology for the early monitoring and detecting the critical dynamic failure modes of the rotating machineries. The essence of the method is to introduce the modulated coordinates such that the periodically time-varying linear differential equations can be effectively transformed to the equivalent time-invariant linear differential equations. The modal analysis procedure for the asymmetric rotor system, of which rotating and stationary parts possess asymmetric and isotropic properties is investigated in the first stage. With a simple asymmetric rotor model, the analytical modal analysis procedure is illustrated and compared with the conventional method based on formulation in the rotating coordinates. A numerical example with a flexible asymmetric rotor model is also provided to demonstrate the effectiveness of the proposed modeling method. In the second stage, the method is extended for asymmetric rotors with anisotropy, so call...
Advisors
Lee, Chong-Wonresearcher이종원researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2004
Identifier
240596/325007  / 000975165
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학전공, 2004.8, [ 1책(면수복잡) ]

Keywords

PARALLEL GEOMETRY; PHASE ANGLE; CREEPW; BALL GRID ARRAY; MODAL ANALYSIS OF GENERAL ROTORER JOINT; SEGMENTATION; 비유용도; 분할; 크리프 평행 형상; BGA; 일반회전체 모드해석더 조인트; INEFFECTIVENESS

URI
http://hdl.handle.net/10203/43521
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=240596&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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