• Title/Summary/Keyword: Bearing

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A Study on the Development of Clad Steel for Diesel Engine (디젤엔진용 클래드강의 소재개발에 관한 연구)

  • Ha, Man-Kyung;Hwang, Young-Mo;Park, Hoo-Myung;Jun, Jae-Uhk;Kim, Soo-Kwang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.3
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    • pp.13-19
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    • 2005
  • Metal Bearing's research that use the clad steel had led in advanced country. Metal Bearing that is produced by domestic companies is ship, vehicles, development equipment and plant equipment. This is Cast White Metal Lining Bearing that is Bimetal Bearing standing 2 generation. Cast White Metal Lining Bearing is foreseen to be used widely on industry whole in the future. Cast White Metal Bearing is product that need precision processing. But the technique is generalized widely. So an advanced country is depending on import from a developing country that price is cheaper than itself manufacture. it is judged that high added value creation by deepening of price competition is difficult. Therefore need product development of new form and is changing to Trimetal Bearing parts. Trimetal Bearing is high quality technique that do compression junction to thin plates of special object on the Back Metal. Therefore, this research developed Trimetal bearing's materials.

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Design Methodology of Main Bearing Cap by a Finite Element Analysis (베어링 캡 유한 요소 해석 설계 방법)

  • Yang, Chull-Ho;Han, Moon-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.1
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    • pp.80-86
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    • 2009
  • Main bearing cap is one of the essential structural elements in internal combustion engine. Main bearing cap guides and holds the crankshaft, withstanding the full combustion and inertia loads of the engine. A seamless design methodology using FEA has been proposed to produce a reliable design of main bearing cap. A Levy's thick cylinder model was applied to calculate the contact pressure between bearing shell and housing bore. A calculated contact pressure at housing bore is within the allowed limit comparing with that from bearing shell model. An adequate FEA model was suggested to obtain reliable solutions for the durability of main bearing cap. 3D global model consists of engine bulkhead, main bearing cap, and bolts. Sub-model consisting of cap and part of bolts is used to get detailed solution of main bearing cap. A very careful contact modeling practice is needed to resolve the convergence problems frequently encountering during combined geometric and material non-linear problems. A proposed methodology has been applied to the main bearing cap model successfully and obtained reliable stress results and fatigue safety factors.

Internal force monitoring design of long span bridges based on ultimate bearing capacity ratios of structural components

  • Hu, Ke;Xie, Zheng;Wang, Zuo-Cai;Ren, Wei-Xin;Chen, Lei-Ke
    • Structural Monitoring and Maintenance
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    • v.5 no.1
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    • pp.93-110
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    • 2018
  • In order to provide a novel strategy for long-span bridge health monitoring system design, this paper proposes a novel ultimate bearing capacity ratios based bridge internal force monitoring design method. The bridge ultimate bearing capacity analysis theories are briefly described. Then, based on the ultimate bearing capacity of the structural component, the component ultimate bearing capacity ratio, the uniformity of ultimate bearing capacity ratio, and the reference of component ultimate bearing capacity ratio are defined. Based on the defined indices, the high bearing components can then be found, and the internal force monitoring system can be designed. Finally, the proposed method is applied to the bridge health monitoring system design of the second highway bridge of Wuhu Yangtze river. Through the ultimate bearing capacity analysis of the bridge in eight load conditions, the high bearing components are found based on the proposed method. The bridge internal force monitoring system is then preliminary designed. The results show that the proposed method can provide quantitative criteria for sensors layout. The monitoring components based on the proposed method are consistent with the actual failure process of the bridge, and can reduce the monitoring of low bearing components. For the second highway bridge of Wuhu Yangtze river, only 59 components are designed to be monitored their internal forces. Therefore, the bridge internal force monitoring system based on the ultimate bearing capacity ratio can decrease the number of monitored components and the cost of the whole monitoring system.

An Improvement of the Stability of Plane Journal Bearing using Leaf Spring Damper (겹판스프링댐퍼를 이용한 저어널베어링의 안정성 향상)

  • 김종수;최영준;제양규
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2000.06a
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    • pp.87-92
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    • 2000
  • In order to improve the instability of Plane journal bearing, it is introduced the leaf spring damper(LSD). The effects of dynamic characteristics of LSD on the stability of a plane journal bearing were investigated theoretically. The improvements on the stability of a plane journal bearing with LSD. are compared with the results of a floating ring journal bearing and of journal bearing without LSD. It found that a plane journal bearing with LSD will be an effective way in the improvement on the stability of rotor system.

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Bearing Fault Diagnostics in a Gearbox (기어박스에서의 베어링 결함 진단)

  • Kim, Heung-Sup;Lee, Sang-Kwon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.611-616
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    • 2002
  • Bearing diagnostics is difficult in a gearbox because bearing signals are masked by the strong gear signals. Self adaptive noise cancellation(SANC) is useful technique to seperate bearing signals from gear signals. While gear signals are correlated with a long correlation length, bearing signals are not correlated with a short length. SANC seperates two components on the basis of correlation length. Then we can find defect frequency component in the envelope spectrum of the bearing signals.

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Abnormal Vibration of Turbine due to Oil Whip (Oil Whip에 의한 터빈의 이상진동)

  • Koo, Jae-Raeyang;Hwang, Jae-Hyeon
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.539-543
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    • 2001
  • Almost all rotating machinery has bearings. Bearing is one of the most important part of rotating machinery. Vibration of rotating machinery depend on its bearing conditions. Bearing conditions are followings ; oil gap, bearing type, bearing temperature, bearing oil condition. Especially, bearing oil condition influences on rotating machinery vibration directly. In this paper we have discussed the abnormal vibration of turbine due to oil condition. oil whip problem was occured in the certain power plant. and we had sloved this problem through the control of operating values and alignment.

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An Improvement of the Stability of Plane Journal Bearing using Leaf Spring Damper (겹판스프링댐퍼를 이용한 저어널베어링의 안정성 향상)

  • 김종수;최영준;제양규
    • Tribology and Lubricants
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    • v.17 no.3
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    • pp.179-184
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    • 2001
  • In order to improve the instability of plane journal bearing, it is introduced the leaf spring damper(LSD). The effects of dynamic characteristics of LSD on the stability of a plane Journal bearing were investigated theoretically. The improvements on the stability of a plane journal bearing with LSD are compared with the results of a floating ring journal bearing and of journal bearing without LSD. It found that a plane journal bearing with LSD will be an effective way in the improvement on the stability of rotor system.

Friction and Wear Characteristics of Fluid Bearing for Spindle Motors (스핀들 모터용 유체베어링의 마찰 및 마멸 특성)

  • 정성훈;박동신;이영제;정광섭;정대현
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2000.11a
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    • pp.372-377
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    • 2000
  • Recently, fluid bearing have been studied to apply to spindle motors for hard disk drive, printer and others. Since fluid bearing have excellent stiffness and good load carrying capacity, the bearing proved to be suitable for those devices related to computer industry. In this paper, the friction and wear characteristics of the bearing were studied. The bearing appears good performance at a high temperature and high wear resistance.

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Aeration Efface on the Oil Supply System of Engine Crankshaft Bearing (Aeration이 엔진 크랭크샤프트 베어링 오일공급 시스템에 미치는 영향)

  • 윤정의
    • Tribology and Lubricants
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    • v.20 no.3
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    • pp.119-124
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    • 2004
  • Engine bearing system is generally affected by aeration. In this paper, the aeration effects on the engine crankshaft bearing system were studied. To do this, unsteady oil flow analysis on the engine crankshaft oil circuit system was carried out. And aeration effects on the bearing system were simulated to figure out lubrication characteristics of the each bearing such as oil flow rate, minimum oil film thickness, friction loss and increase of oil temperature.

Lubrication Analysis of Dynamically-Loaded Crosshead Bearing for Marine Engine (동하중을 받는 박용엔진 크로스헤드 베어링의 윤활해석)

  • 김정훈;김창희;이성우;이득우
    • Tribology and Lubricants
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    • v.13 no.2
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    • pp.46-51
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    • 1997
  • Crosshead bearings in two-stroke marine diesel engines are operated under severe conditions of lubrication because the load on the bearing is unidirectional and the sliding speed is very low and oscillatory. In this paper, the motion of journal in a bearing is investigated using the lubrication theory. Several locus paths are presented to show the effects of oil groove size, bearing clearance and oil inlet pressure. It is found that the minimum film thickness is affected by the oil groove and bearing clearance, and the oil groove is an important design factor.