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.

증속 기어 전동 로터-베어링 시스템의 횡-비틀림 연성 유한요소 로터다이나믹 해석

이안성,하진웅,최동훈 한국소음진동공학회 2001 소음 진동 Vol.11 No.1

In a transmission or geared rotor system a coupled phenomenon of lateral and torsional vibrations may occur due to the gear meshing effect. Particularly, in high speed or low vibration and low noise applications of geared rotor systems a coupled rotordynamic analysis is required to precisely predict their dynamic characteristics. In this paper a generalized finite element model of a gear pair element is developed, which actively couples the lateral and torsional vibrations due to the gear meshing effect. In the modeling the generalized forces due to the transmission error. geometrical eccentricities. and unbalances in the gear system are also considered. Then. using the developed gear pair element model a coupled unforced rotordynamic analysis is performed with a prototype 800 RT turbo-chiller rotor-bearing system having a hull-pinion speed increasing gear. Results show that the torsional vibration characteristics experience some changes due to the gear meshing and lateral dynamic coupling effect, but that they have no adverse effect and the lateral ones have no practical changes in an operating speed range.

통계적 관점을 이용한 신뢰성 보증시험에서의 시료 수, 시험시간, 신뢰수준 예측 : 비행체 구동장치 사례에서

이안성,이원,박연경 대한산업공학회 2014 대한산업공학회 추계학술대회논문집 Vol.2014 No.11

신뢰성 보증시험에서 최대한 많은 시료 수와 시험시간을 투입한다면 보다 더 신뢰할만한 제품을 생산할 수 있을 것이지만, 비행체 시스템의 경우에는 시스템 특징 때문에 비용적인 측면과 시간 등에 부딪혀 비현실적인 것이 사실이다. 또한, 신뢰수준 및 기타 시험설계에 있어서 설계자와 연구자의 주관적인 관점이 개입되어 있어서 설계자와 연구자의 주관적인 관점이 개입되어 보다 더 객관성이 요구되고 있다. 본 연구에서는 비행체 구동장치를 사례로 통계적인 관점에서 접근하여 신뢰수준을 결정하고 시료 수 및 시험시간의 제약 하에서 각각 시험 요소 예측 방법을 제안하였다. 이에 따라, 신뢰성 보증시험 설계에 객관성을 부여하여 보다 더 신뢰할만한 시험 설계를 가능하게 되었으며 더 나아가 보다 더 신뢰성이 높은 제품을 개발하는 것을 기대한다.

패드 선단 테이퍼를 갖는 수력 수직 원통형 터빈 가이드 베어링의 성능향상 - 테이퍼 각도와 길이의 영향

이안성,장선용,박수만 한국트라이볼로지학회 2018 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.34 No.1

Cylindrical turbine guide bearings (TGBs) with simple plain pads have conventionally been used in vertical hydro-power turbine-generator applications in order to provide turbine runner shafts with smooth rotation guides and supports. To overcome low-load/low-eccentricity performance drawbacks, such as very low film stiffness and lack of design credibility in the stiffness values themselves, of conventional cylindrical TGBs, the introduction of a rotational-directional leading-edge taper to each partitioned pad, simply pad leading-edge taper, has been found to be very effective in enhancing their design-application availability and usefulness. In this study, we investigate the effects of taper angle and length for given taper heights in detail in order to systematically establish the effectiveness of design on the performance improvement of vertical hydro-power application cylindrical TGBs with pad leading-edge tapers. The analysis results with 4-Pad×1-Row cylindrical TGBs show that the lubrication performance of the cylindrical TGBs is optimized with an approximate taper angle ratio of 0.8 and taper length ratio of 0.9. We conclude that the introduction of pad leading-edge tapers along with the optimization of taper designs can be very effective in improving the overall operation reliability of cylindrical TGBs and the rotordynamic characteristics of vertical hydro-power turbine-generator rotor-bearing systems as well, to which the TGBs are applied.

스팀터빈 발전기 진동진단 시스템 개발

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.

핵심 회전설비의 신뢰성 보장을 위한 로터다이나믹 설계감리

이안성 한국소음진동공학회 1998 소음 진동 Vol.8 No.5

증속 기어 전동 로터/베어링 시스템의 횡-비틀림 연성 유항요소 로터다이나믹 해석

이안성,하진웅,최동훈 한국소음진동공학회 2001 한국소음진동공학회 논문집 Vol.11 No.1

In a transmission or geared rotor system a coupled phenomenon of lateral and torsional vibrations may occur due to the gear meshing effect. Particularly, in high speed or low vibration and low noise applications of geared rotor systems a coupled rotordynamic analysis is required to precisely predict their dynamic characteristics. In this paper a generalized finite element model of a gear pair element is developed, which actively couples the lateral and torsional vibrations due to the gear meshing effect. In the modeling the generalized forces due to the transmission error, geometrical eccentricities, and unbalances in the gear system are also considered. Then, using the developed gear pair element model a coupled unforced rotordynamic analysis is performed with a prototype 800 RT turbo-chiller rotor-bearing system having a bull-pinion speed increasing gear. Results show that the torsional vibration characteristics experience some changes due to the gear meshing and lateral dynamic coupling effect, but that they have no adverse effect and the lateral ones have no practical changes in an operating speed range.

증속 기어전동 로터-베어링 시스템에서 횡-비틀림 연성진동 특성의 상세 고찰

이안성,하진웅,최동훈 한국소음진동공학회 2002 한국소음진동공학회 논문집 Vol.12 No.2

Applying a general coupled lateral and torsional vibration finite element model of gear pair element, this paper intends to look into in detail the coupled lateral and torsional vibration characteristics of a turbo-chiller rotor bearing system, having a bull-pinion speed increasing gear. Investigations have been carried out systematically by comparing the uncoupled and coupled natural frequencies and their mode shapes upon varying the gear mesh stiffness with considerations on rotating speeds, and also by comparing the strain energies of lateral and torsional vibration modes. Results hale shown that some modes may hale the coupled lateral and torsional mode characteristics as the gear mesh stiffness Increases over a certain value, and moreover that their associated dominant modes may be different from their initial modes, j.e., a certain dominant mode may change from an initial torsional one to a lateral one or from an initial lateral one to a torsional one.

고압 왕복동 압축기의 밸브 거동해석

이안성,홍용주,정영식,변용수 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-

회전체동역학 설계기술 개론

이안성 한국소음진동공학회 2016 소음 진동 Vol.26 No.3