• Title/Summary/Keyword: 위험 속도 선도

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Rotordynamic Characteristics Analysis for API 610 BB5 Pump Development (API 610 BB5 펌프 개발을 위한 로터다이나믹 특성분석)

  • Kim, Byung-Ok;Lee, An-Sung;Kim, Sung-Ki
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.4
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    • pp.38-44
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    • 2011
  • This paper deals with the detail rotordynamic analysis for BB5 eight stages pump as development of API 610 BB5 type pump. Dry-run analytical model, not considering operating fluid, and wet-run analytical model, considering operating fluid are established. In addition, plain circular and pressure dam bearings are chosen and it was discussed that each bearing has an effect on dynamic characteristics of pump rotor system. A rotordynamic analysis includes the critical speed map, Campbell diagram, stability, and unbalance response. As results, it was predicted that rated speed of the pump rotor passes through 1st critical speed in dry-run condition regardless of bearings, however, it was verified that, in wet-run condition, the rotor system doesn't have critical speeds even if more than twice rated speed. Hence the resonance problem caused by the critical speeds does not happen since actual operating is in wet-run condition including operating fluid. As a result of unbalance response analysis, the pump rotor has stable vibration response at rated speed, regardless of operating fluid and the proposed bearing types.

Design of High Speed Spindle for 5-Axis Machining Equipment Equipped with Piezo-Electric Load Sensoring (압전형 부하 센서링이 장착된 5축 절삭가공기의 고속 주축시스템 설계)

  • Choi, Hyun-Jin;Park, Chul-Woo;Jang, Eun-Sil;Kim, Chung-Hyun;Choi, Seong-Dae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.5
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    • pp.20-25
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    • 2011
  • In this paper, we reviewed the spindle system's motor and bearing and its mode safety for optimal design of a high speed spindle system that exceeds DmN value of 1,500,000. We could verify that it has a separation margin during critical speed by performing critical speed analysis. Also, we have selected an optimal sensoring installation location and actually manufactured & installed the sensor by identifying the stress concentration position in the axial load through finite element analysis to install the built-in piezo electric type load sensor to the spindle housing that can measure and monitor the machining load during high speed rotation of the spindle. Reproducibility is also verified by calibrating the error through the sensor's sensitivity adjustment after comparing the output between the plate dynamoneters and the load sensor to confirm the reproducibility of the load sensor.

Unbalance Response Analysis of Copper Die Casting High Speed Induction Motor (동 다이캐스팅 고속 유도전동기의 불평형 응답 해석)

  • Hong, Do-Kwan;Jung, Seung-Wook;Woo, Byung-Chul;Koo, Dae-Hyun;Ahn, Chan-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.7
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    • pp.642-649
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    • 2012
  • This paper deals with a copper die casting induction motor which has several advantages of motor performance. The developed motor is used as spindle motor in machining center. The dynamic characteristic analysis of rotor is dealt with for precision machining. The critical speed of rotor considering rotation and gyroscopic effect should be above operating speed, 18,000 rpm, and have a 201 % sufficient separation margin. Also, the 3-D unbalance vibration response analysis is performed and enabled the prediction of the expected vibration amplitude by unbalance in high speed. The unbalance vibration responses of each position on the rotor are satisfied with allowable vibration displacement of API 611 standard according to balancing G grade(G 0.4, G 2.5, G 6.3). Copper die casting high speed induction motor is successfully developed and verified by experiment.

Analytical evaluation of water injection pump dynamic characteristic (물 분사 펌프 동특성의 해석적 평가)

  • Lee, JongMyeong;Lee, JeongHoon;Ha, JeongMin;Ahn, ByungHyun;Gu, DongSik;Choi, ByeongKeun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.04a
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    • pp.60-64
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    • 2013
  • Water injection pump produced the 1st oil well through the high pressure after the Deep water oil well drilling. After finish the work it is hard to produce only using itself pressure due to low pressure. Therefore it can be increased recovery factor through the injection seawater of high pressure. Is the key equipment used in the marine plant and it is developing at many industries. In this paper, Analyze changes in the natural frequency due to the stiffness of the bearing. Analyze the critical speed of the natural frequency due to the change of operation speed. And evaluate the Stability. And then analyze the displacement and clearance through the unbalance response this way has contributed to the reliability of the developing product. Through a mathematical analysis.

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Analysis of dynamics characteristics of water injection pump through the 2D finite element (2D 유한요소 해석을 통한 Water injection pump의 동특성 분석)

  • LEE, JONG-MYEONG;KIM, YONG-HWI;KIM, JUN-HO;CHOI, HYEON-CHEOL;CHOI, BYEONG KEUN
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.04a
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    • pp.408-414
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    • 2014
  • After drilling operations at the offshore plant to production to crude oil to high pressure. After that time the low pressured of pipe inside when the secondary produce so oil recovery is reduced. At that time injection sea water at the pipe inside through water injection pump that the device Increase recovery so to be research and development at many industry. So developing 3-stage water injection pump at the domestic company. A variety of mathematical analysis during the detailed design analysis was not made through the dynamics characteristic. In this paper, a 2D finite element analysis is performed through the dynamics of the present study was the validation of the model.

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Rotordynamic Transient Analysis of Vertical Sea Water Lift Pump for FPSO Deep Well (FPSO 심정용 수직 해수펌프의 로터다이나믹 과도해석)

  • Kim, Byung-Ok;Yang, Sung-Jin;Lee, Myung-Ho
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.5
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    • pp.69-74
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    • 2011
  • This paper deals with the detail rotordynamic analysis for the vertical rotor system as development of vertical sea water lift pump for FPSO deep well. In a vertical rotor system, since linearized stiffness and damping coefficients of fluid film bearing are no longer be valid, hence the transient response analysis considering a fluid film force for every journal position in the bearing needs to be required. In this study, the transient response analysis of the proposed vertical pump rotor system was carried out in dry-run and wet-run conditions, respectively. The results show that orbital vibration responses of the rotor system remain stable at rated speed and thereby operating reliability of the vertical rotor system is confirmed. To overcome complexity of calculation pr ocedure and time consuming calculation of transient analysis, the calculating technique of steady-state response analysis is also proposed. The results of steady-state response obtained by applying the proposed technique to the rotor system are good agreement with the reference results, that is, transient responses.

Analysis of Dynamic Characteristics of Water Injection Pump (물 분사 펌프의 동특성 분석)

  • Lee, Jong Myeong;Lee, Jeong Hoon;Ha, Jeong Min;Ahn, Byung Hyun;Kim, Won Cheol;Choi, Byeong Keun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.12
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    • pp.1483-1487
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    • 2013
  • Water injection pump outputs oil with high pressure during this process, seawater is injected into the well to recover the well pressure and maintain high productivity. A water injection pump has high productivity, and therefore, it serves as a key piece of equipment in marine plants. In this light, water injection pumps are being studied widely in industry. In this study, the rotor dynamics is analyzed to determine the natural frequency according to the bearing stiffness and operation speed change. This study aims to establish the pump reliability through critical speed, stability, and unbalance response analysis.

Analysis of Dynamics Characteristics of Water Injection Pump through the 2D Finite Element (2D 유한요소 해석을 통한 물 분사 펌프의 동특성 분석)

  • Lee, Jong-Myeong;Kim, Yong-Hwi;Kim, Jun-Ho;Choi, Hyeon-Cheol;Choi, Byeong Keun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.6
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    • pp.462-469
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    • 2014
  • After drilling operations at the offshore plant, crude oil is producted under high pressure. After that time, oil recovery is reduced, because the pressure of the pipe inside is low during the secondary produce. At that time injection sea water at the pipe inside through water injection pump that the device increase to recovery. A variety of mathematical analysis during the detailed design analysis was not made through the dynamics characteristic at the domestic company. 2D model has reliability of analysis results for the uncomplicated model. Also element and the node the number of significantly less than in the 3D model. So, the temporal part is very effective. In addition, depending on the quality of mesh 3D is a real model and FEM model occurs error. So, user needs a lot of skill. In this paper, a 2D finite element analysis was performed through the dynamics analysis and the study model was validated.