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터보 냉동기의 변동 기어하중을 고려한 로터다이나믹 해석 Part I
이안성,정진희 한국소음진동공학회 1999 소음 진동 Vol.9 No.3
A rotordynamic analysis is performed with a motor-bull gear rotor system supported on two partial bearings, which is intended to drive a high-speed turbo-chiller compressor impeller shaft through its built-in pinion gear. The motor-bull gear rotor system has a rated speed of 3,600 rpm, and is modeled utilizing the finite element method for analysis. As loadings on the bearings due to the gear action are significant in the system considered, each resultant bearing load is calculated statically by considering the generalized forces of the gear action as well as the rotor itself. The two support partial bearings are designed to take their varying loads along with their varying load angles, and they are also analyzed to give their rotordynamic coefficients. Then, a complex rotordynamic analysis of the motor-bull gear rotor-bearing system is carried out to evaluate its whirl natural frequencies and mode shapes and unbalance responses under various loading conditions. Results show that the bearings and entire rotor system are well designed regradless of operating conditions, i.e., loads and operating speeds.
이안성,홍성욱,김호종,이현 한국소음진동공학회 1995 소음 진동 Vol.5 No.4
Modern steam turbine generators are being built as a higher power and larger system, experiencing more frequent starts and stops of operation due to a constant change of power demands. Hence, they are inevitably more vulnerable to various vibrations, and more often exposed to the danger of sudden vibration accidents than ever before. Even under the circumstances, in order to secure the system reliability of steampower plants and there by to supply safely the public electricity, it is important to prevent a sudden vibration accident in one hand and even when it happens, to raise an operating efficiency of the plants throught swift and precise treatments in the other. In this study, an interactive vibration diagnostic system has been developed to make the on-site vibration diagnosis of steam turbine generators possible and convenient, utilizing a note-book PC. For this purpose, at first the principal vibration phenomena, such as various unbalance and unstable vibrations as well as rubbing, misalignment, and shaft crack vibrations, have been systematically classified as grouped parameters of vibration frequencies, amplitudes, phases, rotating speeds at the time of accident, and operating conditions or condition changes. A new complex vibration diagnostic table has been constructed from the causal relations between the characteristic parameters and the principal vibration phenomena. Then, the diagnostic system has been developed to screen and issue the corresponding vibration phenomena by assigning to each user-selected combination of characteristic parameters a unique characteristic vector and comparing this vector with a diagnostic vector of each vibration phenomenon based on the constructed diagnostic table. Moreover, the diagnostic system has a logic whose diagnosis may be performed successfully by inputing only some of the corresponding characteristic parameters without having to input all the parameters. The developed diagnostic system has been applied to perform the diagnosis of several real cases of steam turbine vibration accidents. And the results have been quite satisfactory.
기어 전동 2축 로터-베어링 시스템의 연성 불균형 응답해석
이안성,하진웅 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.8
In this paper a general solution method is presented to obtain the unbalance response orbit from the finite element based equations of motion of a gear-coupled two-shaft rotor-bearing system, whose shafts rotate at their different speeds from each other. Particularly, are proposed analytical solutions of the maximum and minimum radii of the orbit. The method has been applied to analyze the unbalance response of a 800 refrigeration-ton turbo-chiller rotor-bearing system having a bull-pinion speed increasing gear. Bumps in the unbalance response of the driven high speed compressor rotor system have been observed at the first torsional natural frequency due to the coupling effect of lateral and torsional dynamics. Further, the proposed analytical solutions have agreed well with those obtained by a full numerical approach. The proposed analytical solutions can be generally applied to obtain the maximum and minimum radii of the unbalance response orbits of dual-shaft rotor-bearing systems coupled by bearings as well.
Duane 모델과 AMSAA 모델을 이용한 신뢰성 성장 예측 방안 비교 연구
이안성,김무영,조일훈 한국신뢰성학회 2015 한국신뢰성학회 학술대회논문집 Vol.2015 No.5
신뢰성 성장 프로그램은 미국, EU 등 선진국의 군수 및 민수산업에서 오래 전부터 제품개발 기간 단축과 신뢰성 향상을 위하여 적용해오고 있다. 본 연구에서는 이러한 신뢰성 성장 이론 및 적용 사례를 조사하여 OO무기체계에 적합한 성장 예측모델을 도출하고, 도출된 모델을 FAT/DT/OT 등 단계별 시험 결과에 대해 적용하여 OO무기체계의 신뢰성 성장 예측을 진행하였다. OO무기체계의 FAT 및 DT/OT 시험 결과로 발생할 수 있는 72가지 경우에 대해 AMSAA 모델과 Duane 모델을 적용하여 비교예측을 수행하였다. 그 결과 대채적으로 AMSAA 모델의 신뢰도 추정치가 다소 높게 나타났다. 이러한 연구 결과는 OO무기체계의 신뢰성 성장 예측에 유용하게 활용될 수 있을 뿐만 아니라 다른 무기체계에 대해서도 충분히 적용 가능할 수 있을 것이라 예상되기 때문에 해당 무기체계들에 대한 신뢰성 성장 예측 방안들이 확보될 수 있을 것이다.