• Title/Summary/Keyword: 위험 속도 선도

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G/T 250톤 카페리선 축계의 동특성에 관한 고찰

  • Gang, Byeong-Mo;Go, Jae-Yong;Seo, Gwang-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2015.07a
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    • pp.82-84
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    • 2015
  • 유한요소법을 이용하여 카페리선 제작 시 축계의 제작 및 강도의 문제를 Campbell Diagram 및 Modal 해석을 통한 동특성 분석을 하였다. 이를 통하여 양방향 차도선의 추진 방향 및 후진 방향 축계 작동 시 공진 현상 및 위험속도를 분석 결과 안정성을 보인 것으로 판단된다.

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An Analysis of Running Safety for Railway Vehicle Depending on Actual Track Conditions (실제선로 조건에 따른 철도차량의 주행안전성 해석)

  • Kim, Yong-Won;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.983-988
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    • 2009
  • When the railway vehicle passing through curves & transitions, the running speed must improve by proposing the practical standard about maximum running possibility speed of each section on existing line considering running safety. In this paper, when the railway vehicle passing through curves of actual track conditions (Namsunghyun-Chungdo up & down lines), the effect that has influence on running safety is examined to devise the high speed of vehicle which passing through curves which risk of derailment is high. The running safety analysis is performed that running speed by curve radius improves 5-20% compared with existing speed under actual track conditions. In result of the running safety analysis, in case the speed condition is fewer than 15% compared with existing speed, the derailment coefficient and unloading ratio are within acceptable level. so we could confirm possibility of speed improvement on the whole Namsunghyun-Chungdo up & down lines.

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.

Development of the Multi-Gear Train Devices of Synchro System for the Guns of a Warship which Considered the Noise/Vibration (소음/진동을 고려한 함포용 Synchro System의 다단 기어 구동장치 개발)

  • Lee, Hyoung-Woo;Hur, Nam-Soo;Kim, In-Hwan;Lee, Dong-Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.8
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    • pp.1057-1067
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    • 2010
  • Vibration and noise analysis as well as strength of gear teeth, gear profile design are considered in order to develop the multi-gear train devices of synchro system for the guns of a warship. A new approach to the critical speed calculation of practical industrial multi-mesh geared system is presented. A transfer matrix model based on Hibner's branch method is developed and the natural properties of the branched rotor system are calculated with using the ${\lambda}$-matrix formulation. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors and the transmitted errors of the gearing are considered, shows that, at theoperating speed, there are not the critical speed.

A Study on Derailment Safety Analysis in a Conventional Line (Dongdaegoo-Namsunghyun) (기존선 구간(동대구-남성현)에서의 탈선안전도 해석 연구)

  • Kim, Yong-Won;Eom, Beom-Gyu;Kang, Bu-Byoung;Lee, Hi-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.8
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    • pp.941-949
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    • 2011
  • When a railway vehicle passes through curves & transitions, the running speed must be improved by setting limits on the maximum running speed in each section of the conventional line(Dongdaegoo-Namsunghyun) considering derailment safety. Our goal is to improve the maximum running speed of railway vehicle that passes through curves & transitions where there is a high risk of derailment. We examined the influence on the derailment safety when the railway vehicle passes through curves of actual track conditions (Dongdaegoo-Namsunghyun up and down lines). We performed the derailment safety analysis by increasing the running speed on curve radius by 5%.20% compared to existing speed under actual track conditions.

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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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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Yaw Gearbox Design for 4MW Class Wind Turbine (4MW급 풍력발전기용 요 감속기 설계)

  • Lee, Hyoung-Woo;Kim, In-Hwan;Lee, Jae-Shin
    • Journal of Convergence for Information Technology
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    • v.12 no.2
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    • pp.142-148
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    • 2022
  • In this paper, the weight reduction design of the yaw gearbox for wind turbine was performed through the finite element analysis method, and the stability was checked by performing the critical speed analysis. The weight reduction product can improve engine efficiency, save parts materials, and earn economic benefits. The yaw gearbox is lightweighted with the goal of achieving a safety rate of 1.3 or higher for wind turbine as indicated by IEC61400-1. In order to reduce the weight of the carrier, a topology optimization method was performed. The safety factor was verified by performing finite element analysis on the carrier. In addition, the housing and carrier were modeled using the finite element method, and the gear train was modeled using MASTA. For the yaw gearbox, the housing and carrier FE model and the gear train model were connected by the partial structural synthesis method to perform the rotational vibration analysis. Vibration excitation sources are mass unbalance and gear mesh frrequemcy, and as a result of the critical speed analysis, it was found that there was no resonance within the operating speed range.

Structural Safety and Critical Speed Analysis of 2-Speed Shift Reducer (2속 변속 감속기의 구조 안전성 분석과 위험속도 해석)

  • Kang, Jin Gyeong;Yoo, Young Rak;Park, Kyu Tae
    • Journal of Drive and Control
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    • v.19 no.4
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    • pp.1-9
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    • 2022
  • The structure and operating principle of the 2-speed shift reducer were explained, the allowable bending stress value of the material was compared with the analysis result through FM structural analysis program, and the average stress distribution value of von Mises was performed on the gear root atmosphere. The structural safety of the 2-speed planetary gear reducer was verified through FM structural analysis. The natural frequency was calculated by applying the specifications of the planetary gears of the 2-speed gearbox, and the critical speed of resonance was calculated by calculating the natural frequency and the transmission error of the engaged gear pair. As a result of analyzing the critical speed, since it is formed higher than the actual operating speed range, it is considered safe because there is no resonance problem due to the suggested specifications of the planetary gears of the 2-speed shift reduction.