• 제목/요약/키워드: Bearing error

검색결과 286건 처리시간 0.027초

2.5MW 풍력발전기 기어박스 동특성 연구 (Study of Dynamic Characteristics of 2.5-MW Wind Turbine Gearbox)

  • 김정수;박노길;한기봉;이형우
    • 한국해양공학회지
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    • 제28권4호
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    • pp.314-323
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    • 2014
  • In this study, a gearbox and blade were modeled in the MASTA program, and the housing and carrier components were modeled using a finite element method. Using substructure synthesis, all the components were combined and used to establish a vibration model of a 2.5-MW wind turbine gearbox. In addition, the safety displacement factor was evaluated using an AGMA data sheet about bearing's outer race for the input shaft and output shaft. As a result, the bearing's outer race for the input shaft, and the radial and axial responses were satisfied by the $1^{st}$ and $2^{nd}$ planetary gears and the $3^{nd}$ helical gear transmission error(TE), respectively. However, the output shaft support bearing's outer race responses were not satisfied with the radial response by the $2^{nd}$ TE and axial response by the $3^{rd}$ TE. To reduce the vibration, tooth modification was needed. After profile tooth modification, at the outer race of the output shaft support bearing, the radial response was reduced by approximately $20{\mu}m$, and the axial response was reduced by approximately $6{\mu}m$.

공기 동압 베어링을 갖는 디지털 라이트닝 프로세서 모터용 코어리스 및 슬롯리스 BLDC 모터의 특성 분석 및 비교 (Characteristics Analysis and Comparison of Careless and Slotless BLDC Motor used in Digital Lightening Processor Motor with Air-Dynamic Bearing)

  • 양이우;김영석;김상욱
    • 전기학회논문지
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    • 제56권6호
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    • pp.1039-1046
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    • 2007
  • This paper presents the analysis for power consumption, mechanical vibration and acoustic noise characteristics of the Coreless and Slotless Brushless DC motor in Digital Lightening Processor(DLP) Motor with the Air-Dynamic Bearing. The Coreless BLDC motor has not the stator yoke as well as the stator slot to remove the unbalance force by the interaction between the stator yoke and Air-Dynamic Bearing clearance. The assembling tolerance and the processing error make the air-gap difference between the magnet and the stator yoke .which occurs the unbalanced electro-magnetic force in the Slotless BLDC motor. It imposes the air-dynamic bearing on the disturbance force and makes the Air-Dynamic Bearing vibrated and noised. Also, The attractive force between the magnet and the silicon steel stator yoke increases the power consumption. In this paper, the power consumption, mechanical vibration and acoustic noise of the Coreless BLDC motor and the Slotless BLDC motor with the silicon steel stator yoke are simulated, analyzed, and tested using the manufactured proto-type motors with Air-Dynamic bearing. The simulated and tested results present that the Coreless BLDC motor without the silicon steel stator yoke has the lower mechanical vibration and noise ,and lower power consumption than the Slotless BLDC motor with the silicon steel stator yoke in Digital Lightening Processor Motor with Air-Dynamic Bearing.

A Study on the Measurement of Oil-Film Pressure in Engine Connecting Rod Bearing and Piston Pin-Boss by Thin-Film Sensor

  • Mihara, Yuji;Someya, Tsuneo
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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    • pp.409-410
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    • 2002
  • In order to measure the oil-film pressure in sliding surface of machinery, we have developed a piezo-resistive type thin-film pressure sensor. To reduce the measurement error due to temperature and strain, the constituent of the pressure sensitive alloy was optimized and a new sensor shape was devised. In this study, we present the measurement results of the oil-film pressure distribution in engine connecting rod big-end bearing and piston pin- bosses with 3 different pin-boss shapes using the newly developed thin-film pressure sensor.

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Clearance and preload effects on NRRO of miniaturc ball bearings with waviness

  • Kim, Y.C.;Choi, S.K.;Yoon, K.C.
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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    • pp.303-304
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    • 2002
  • This paper presents theoretical analysis of the NRRO(the non-repeatable run-out) for a ball bearing with geometric imperfection. This imperfection contains ball size error, ball waviness, outer race waviness and inner race waviness. The 3D dynamic analysis of a ball bearing using the Newton-Raphson method is performed to calculate the displacement of shaft center. The radial and axial NRRO are simulated, and preload and clearance effects are investigated. Preload and clearance have significant effects on radial and axial NRRO of for miniature ball bearings.

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레이저 간섭계를 이용한 곡률반경 측정에 관한 연구 (A study on measurement of curvature radius by the using of laser Interferometer)

  • 김수용;이승수;박재덕;송영철;전언찬
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.920-924
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    • 2003
  • This paper on measurement of curvature radius by the using of laser interferometer and prove. Mean value compared of ball and bearing It is developed program for date creation, and the verification using program. Measurement object center and curvature radius taking of LSC. when it is compared bearing prove with ball prove, the bearing prove can not proper by reason of big uncertainty and If laser setting error decrease, curvature radius get precision radius 10$\^$-5/.

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자기베어링지지 연삭기 추축계의 고속 회전시 런아웃 적응제어 (Adaptive Runout Control of Magnetically Suspended High Speed Grinder Spindle)

  • 노승국;경진호;박종권;최언돈
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.52-55
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    • 1997
  • In this paper, the case study of reducing rotational errors is done for a grinding spindle with an active magnetic bearing system. The rotational errors acting on the magnetic bearing spindle are due to mass unbalance of rotor, runout, grinding excitation and unmodeled nonlinear dynamics of electromagnets. For the most case, the electrical runout of sensor target is big even in well-finished surface; this runout can cause a rotation error amplified by feedback control system. The adaptive feedforward method based on LMS algorithm is discussed to compensate this kind of runout effects, and investigated its effectiveness by numerical simulation and experimental analysis. The rotor orbit size in both bearings is reduced about to 5 pin due to lX rejection by feedforward control up to 50, 000 rpm.

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능동자기베어링계를 위한 슬라이딩모드 제어 (Sliding Mode Control for an Active Magnetic Bearing System)

  • 강민식
    • 한국정밀공학회지
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    • 제25권12호
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    • pp.82-88
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    • 2008
  • This paper describes an application of sliding mode control to an active magnetic bearing(AMB) system. A sliding mode control is robust to model uncertainties and external disturbances. To ensure the authority of sliding mode control, model parameter uncertainties caused from linearization of electro-magnetic attractive force are analyzed and a domain of parameter uncertainties in which reachability to sliding surface is guaranteed is derived. The validity of the analysis is illustrated along with some simulation examples.

대형 복합수직선반 가공기용 유정압베어링 회전테이블 성능 실험 및 분석 (Performance Evaluation of Hydrostatic Bearing Guided Rotary Table for Large Volume Multi-tasking Vertical Lathe)

  • 심종엽;오정석;박천홍;신흥철;박우상;김민재;김민수
    • 한국정밀공학회지
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    • 제31권7호
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    • pp.635-642
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    • 2014
  • The large volume multi-tasking vertical lathe was developed for machining the bearing parts for a wind power generator. Although the machined part is large in size high precision tolerances are required recently. One of the most important components to achieve this mission is the rotating table which holds and supports the part to be machined. The oil hydrostatic bearing is adopted for the thrust bearing and the rolling bearing for the radial bearing. In this article experimental performance evaluation and its analysis results are presented. The rotational accuracy of the table is assessed and the frequency domain analysis for the structural loop is performed. And in order to evaluate the structural characteristic of table the moment load experiment is performed. The rotational error motion is measured as below 10 ${\mu}m$ for the radial and axial direction and 22,800 Nm/arcsec of moment stiffness is achieved for the rotary table.

TSP탐사를 이용한 터널 굴착면 전방 지질상태 및 함수대 분석 (Analysis of geological conditions and water bearing zones in front of tunnel face using TSP)

  • 임경학;박연준
    • 한국터널지하공간학회 논문집
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    • 제25권5호
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    • pp.373-386
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    • 2023
  • 터널 굴착면 전방의 지질상태 및 함수대 예측을 분석하기 위하여 단층파쇄대 붕락구간에서 TSP탐사를 수행하였다. TSP탐사 결과는 예측구간의 막장면 관찰 결과와 비교하여 검증하였다. TSP탐사의 암질 예측 결과는 막장면 관찰 결과와 비교하여 약 3~10 m의 오차가 발생하였으나 전반적인 암질 변화 및 지반상태는 비교적 유사한 것으로 분석되었다. 막장면 관찰의 함수대에서 탄성파 속도비는 1.79~2.37, 포아송비는 0.27~0.39의 범위를 보인다. 함수대 이외 구간(젖은상태(wet))의 탄성파 속도비는 1.61~1.89, 포아송비는 0.19~0.3의 값을 보인다. 탄성파 속도비와 포아송비 분포를 분석하면 탄성파 속도비는 2.0 이상, 포아송비는 0.3 이상에서 함수대 가능성이 높은 구간으로 분석된다.

베어링 생산수율 향상을 위한 센서기반 품질 체크 모니터링 장치 (Quality Check Monitoring System for Advancing the Yield Rate based on Sensor)

  • 조상;윤달환
    • 전기전자학회논문지
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    • 제23권1호
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    • pp.22-28
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    • 2019
  • 본 연구는 차량용 보링 생산 공정에서 기계적인 에러를 체크하기 위한 품질 체크용 모니터링 시스템을 개발한다. 기계적인 에러는 이상적인 절단경로와 비교하여 실제 절단경로의 공간위치 차이에서 나타난다. 제조공정 제품의 오차를 모니터하기 위해 제품의 인지왜곡, 죄임 에러, 기계공구의 회전과 운동에러의 반경회전과 같이 보링 품질에 영향을 미치는 다수 요소들을 설명한다. 생산품질을 입증하기 위해 IT 융합에 기반한 공정 에러율을 분석하고 분석 데이터를 메모리에 저장하는 품질체크 방법을 제안한다. 따라서 불량 생산 제품을 감지함으로써, 생산 코스트와 베어링의 손실을 줄일 수 있다.