• Title/Summary/Keyword: commercial power

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A Study on the Shape Optimization Design of the Knuckle by the Finite Element Analysis (유한요소해석에 의한 Knuckle의 최적형상설계에 관한 연구)

  • Rha, W.Y.;Lee, S.H.;Oh, S.K.
    • Journal of Power System Engineering
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    • v.12 no.1
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    • pp.53-57
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    • 2008
  • The automotive industry faces many competitive challenges including weight and cost reduction to meet need for higher fuel economy. It is a trend that a lot of parts have been currently changed to an aluminum alloy from steel materials. It is required more precise analysis for practical load because of complexities and varieties of vehicle structure. In this study, the shape optimization using a FEA is performed to determine the design of the knuckle. The size optimization is carried out to find thickness while the stiffness constraints are satisfied. A commercial optimization software MSC/NASTRAN is utilized for the structural analysis and the optimization processes.

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A Study on the Improving Proposals of the lACS's EMS Test Requirments for the Micro Processor Control Equipments of the Commercial Ship (선박용 프로세서 제어설비의 전자파 내성 시험규격(IACS) 개선안에 관한 연구)

  • 임재열;임준석;민경찬
    • Journal of the Korean Institute of Navigation
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    • v.22 no.4
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    • pp.45-50
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    • 1998
  • A recently constructed commercial ship is a complexive integrated system like a small city in which has a generator, power distributing facilities, various radio equipments and high power circuit breakers are installed. Therfore it could make a malfunction of the microprocessor in the various control units which are so important during the ocean voyage of larger ship. This paper has studied whether is properly required or not on the view of the actual electro magnetic compatibility status on the electromagnetic interference and suceptibility test requirments listed on the IACS (International Association of the Classification Society). Through these results, we are looking forward to the new suggestions of the Electro Magnetic Compatibility test in order to reduce the malfunction in the ship regarding test item, test level, and test condition.

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A Study on Hydraulic Performance of Francis Turbine for Small Hydropower Plants (소수력 발전용 프란시스 수차의 수력학적 성능에 관한 연구)

  • Choi, J.S.;Kim, I.S.;Moon, C.J.;Kim, O.S.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.687-689
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    • 2005
  • Francis turbine of commercial small hydro -power plants under 10kw which is investigate a flow characterist and an efficiency in the research which it sees, the problem and an improvement is investigate. In the research which it is simply model with casing, guide-vane, runner, draft tube for simulation numerical analysis of small-sized Francis turbine. model uses the Gambit and it composes with approximately 800,000 nonuniform lattices. Solutions are investigate the hydraulic characteristics against an outward angle of guide vane, the number of guide vane, head(inlet velocity) by using FLUENT which is a commercial business code.

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A Study of Single-Phase PFC Rectifier Circuit by LC Resonance (LC공진에 의한 단상 PFC정류회로의 연구)

  • Lee, S.H.;Park, J.M.;Kim, Y.M.;Kwon, S.K.;Suh, K.Y.
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1235-1237
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    • 2003
  • For small capacity rectifier circuits as these for consumer electronics and appli capacitor input type rectifier circuits are gen used. Consequently. various harmonics gen within the power system become a serious pro Various studies of this effect have been pres previously. However. most of these employ swit devices, such as FETs and the like. The absen switching devices makes systems more toleran over -load, and brings low radio noise benefits propose a power factor correction scheme using resonant in commercial frequency without swit devices. In this method. It makes a sinusoidal by widening conduction period using the cu resonance in commercial frequency. Hence, harmonic characteristics can be significantly imp where the lower order harmonics. such as the and seventh orders are much reduced. The resu confirmed by the theoretical and experm implementations.

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Topology of input current waveform improvement type single-phase rectifier (입력전류 파형 개선형 단상 정류기의 토폴로지)

  • 이상현;박진민;문상필;서기영
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2003.11a
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    • pp.403-406
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    • 2003
  • For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. However, most of these employ switching devices, such as FET and the like. The absence of switching devices mattes systems more tolerant to over-load and brings low radio noise benefits. We propose a power factor correction scheme using a LC resonant in commercial frequency without switching devices. In this method It makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence, the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh orders are much reduced The result are confirmed by the theoretical and experimental implementations.

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Design Of practical Voltage Stability Analysis Program (상용 전압안정도 해석 프로그램 설계)

  • Shin, Man-Cheol;Oh, Sung-Kyun;Kim, Kern-Joong;Hwang, In-Joon;Park, Hyun-Shin
    • Proceedings of the KIEE Conference
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    • 2004.11b
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    • pp.155-157
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    • 2004
  • Voltage control and stability problems are very important in the electric utility industry. But there is no voltage stability analysis program which has reliability as commercial program in domestic. We are developing a practical voltage stability analysis program. In this paper, we will study the existing commercial program and then discuss design of practical analysis tool.

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A Study of Mechanical Properties in Compression on High density Graphite Products with Expanded Graphite (고밀도 팽창흑연 성형품의 압축 특성에 관한 연구)

  • Shin, Y.W.
    • Journal of Power System Engineering
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    • v.10 no.1
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    • pp.52-59
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    • 2006
  • Graphite is well known as a material which has high-temperature thermostable property, chemical resistance against acid and alkaline state also is very easy to environment. Nowadays the need of graphite product is increasing rapidly because of its advantages. In this paper, the mechanical property of newly developed graphite products with high density is investigated with especially in compression test. I introduced the graphite specimens for this study by NGF method with two expandable graphite and compared to the specimens of commercial graphite sheet from expanded graphite which made by the rolling process. I investigated the characteristics of these materials by measuring specific weight, hardness, compressive strength and investigating structures by SEM, It is verified that the graphite products with NGF method has superior properties for using gasket materials than that of commercial graphite sheet.

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Simultaneous Reduction of Smoke and NOx with Oxygenated Fuel(DMC) and Cooled EGR method in Diesel Engine (디젤기관에서 함산소연료(DMC)와 Cooled EGR방법에 의한 매연과 NOx의 동시저감)

  • Oh, Y.T.;Choi, S.H.
    • Journal of Power System Engineering
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    • v.6 no.1
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    • pp.27-35
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    • 2002
  • In this paper, the effect of oxygen component in fuel on the exhaust emissions has been investigated for direct injection diesel engine. It is tested to estimate change of engine performance and exhaust emission characteristics for the commercial diesel fuel and oxygenate blended fuel which has four kinds of mixed ratio. And, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission and brake specific fuel consumption rate have been investigated. Dimethyl carbonate(DMC) contains oxygen component 53.3% in itself, and it is a kind of effective oxygenated fuel of carbonate group that the smoke emission of DMC is reduced remarkably in comparison with commercial diesel fuel, that is, it can supply oxygen component sufficiently at higher loads and speeds in diesel engine. It was found that simultaneous reduction of smoke and NOx was achieved with oxygenated fuel and EGR method.

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Study on the Design of a Novel Adaptive Gripper (적응형 그리퍼 설계 연구)

  • Kim, Gi Sung;Kim, Han Sung
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.3
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    • pp.325-335
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    • 2019
  • In this paper, a novel adaptive gripper with underactuation is presented, which can change its configuration to parallel or power grip mode according to object shapes. Differently from the commercial adaptive gripper by RobotiQ, the proposed gripper includes an actual parallelogram inside a five-bar mechanism, which allows the free selection of actuator locations and can reduce actuation torques effectively. The forward and inverse kinematics for two grip modes and statics analysis have been analyzed. From the comparative design, the proposed gripper has about 20% smaller size, 3.7% larger stroke, and 30.5% smaller average actuation torque than the commercial one.

THE NEW DEUTZ ENGINE FAMILY 2013 FOR COMMERCIAL VEHICLES

  • Mikulic, L.;Pleimling, H.;Pfeifer, A.;Lingens, A.
    • International Journal of Automotive Technology
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    • v.2 no.4
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    • pp.135-145
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    • 2001
  • DEUTZ AG, co-founded in 1864 by Nicolaus August Otto, the inventor of the four-stroke cycle engine, has developed the new 2013 engine for commercial vehicles on the basis of the tried and tested 1012 and 1013 series. With 4 and 6 cylinder models, the engine covers the power range between 100 and 190 kW. At the time of their introduction to the market, the engines will meet the exhaust emission legislation of EURO IV and incorporate the potential for EURO IV, Further engineering targets were. (Compactness, Favourable power/cost relation, Low weight, Low fuel consumption and Low noise level). All targets could be accomplished in a relatively short development period via the application of modem simulation tools and test methods. In this paper, the design configuration of the engines is described with particular emphasis on measures for noise emission reduction and the combustion system including injection and turbo charging. Furthermore, we demonstrate the engine's potential to fullfill the European emission legislation EU4, which comes into force in 2005.

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