• 제목/요약/키워드: Lean Development

검색결과 224건 처리시간 0.025초

흡입 스월유동이 Sl기관의 희박연소에 미치는 영향 (The Effects of Intake Swirl Flow en Lean Combustion in an Sl Engine)

  • 정구섭;전충환;장영준
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제25권6호
    • /
    • pp.1298-1307
    • /
    • 2001
  • Recently, the efforts to improve fuel economy and to reduce pollutant emission have become the main subject in the development of a gasoline engine. A lean combustion engine admitted as the best alternative is relatively lower fuel consumption rate and exhaust emissions. In this study, it is focused on intensifying intake flow field as one of methods to improve the performance of the lean combustion. First, three different types of suitable swirl control valve(SC7) with high swirl and tumble ratio are selected through steady flow experiment, being installed in a spark ignition engine. The relationship between lean misfire limit and torque was investigated with injection timing and spark ignition timing. Also, the effect of intensified swirl new on the combustion Stability and exhaust emissions was experimently examined by the measuring in-cylinder pressure and combustion variation. The results show that the engine with swirl control calve is superior to other conventional engine on the lean misfire limit, specific torque, combustion variation and emission, and the appropriate injection timing and spark ignition timing exist according to the type of swirl control valve.

  • PDF

시간가동률 척도에 의한 Lean OEE의 연계지표 개발 및 적용 (Development and Implementation of Chain Metrics for Obtaining Lean Overall Equipment Effectiveness Using Availability Measures)

  • 최성운
    • 대한안전경영과학회지
    • /
    • 제14권2호
    • /
    • pp.147-158
    • /
    • 2012
  • This paper aims to develop a new chain metrics for obtaining lean Overall Equipment Effectiveness(OEE) and present implementation strategy which considers the properties for Total Productive Maintenance(TPM) to reduce machine losses, Performance Analysis and Control(PAC) to reduce labor losses, Lean Production System(LPS) to reduce floor wastes, and Theory of Constraints(TOC) to minimize the problem of Capacity Constrained Resource(CCR). The study reviews the related literatures and reformulates the structure of machine losses, labor losses and field wastes. The research also develops the integrated productivity metrics according to time, units, reliability and maintainability. It is found that the study develops the actual productivity measure in terms of efficiency, effectiveness and standard productivity. In addition to that, it outlines and develops by using the integrated LPS and TPM, lean OEE measures such as Time Based Productivity(TBP), Unit Based Productivity(UBP), and Reliability & Maintainability Based Availability(RMBA). Implication examples are proposed to make it easier and available for practioners to understand the implementation strategies about TPM OEE, lean OEE and TOC OEE. Futhermore related to other studies, the research contributes to create a new chain productivity measures to clear the interrelationship concepts of productivity, efficiency and effectiveness. Moreover the paper develops the enhanced OEE measures by integration of TPM, PAC, LPS and TOC with the perspective of schedule, throughput, reliability, maintainability and availability.

LEAN-BURN ENGINE - POTENTIAL ANALYSIS

  • Kowalewicz, A.
    • International Journal of Automotive Technology
    • /
    • 제2권4호
    • /
    • pp.147-155
    • /
    • 2001
  • Analysis of the thermodynamic cycle of IC engine from the point of view of economy and emissions was carried out. From this analysis potential capability of engine development was derived. This potential capability is lean-burn engine, fuelled with homogeneous mixture with $\lambda \geq$ 1.4. Several different modes of fuelling were proposed and tested on one-cylinder test engine from the point of view of extending lean operating limit of the engine, emissions and fuel economy. Among them were: fuelling with evaporated preheated gasoline, with gas (LPG evaporated) and with liquid butane. From these modes, fuelling with liquid butane injected to inlet port was selected and finally tested. This novel system of fuelling offered better than standard engine performances and emissions at lean operating limit. These results were validated on full-scale two-cylinder engine.

  • PDF

균일 혼합기를 이용한 이론 공연비 직접분사 가솔린 엔진 개발에 관한 실험적 연구 (A Study on the Development of Stoichiometric Direct Injection Gasoline Engine by Homogeneous Charge)

  • 이내현;유철호;최규훈
    • 한국자동차공학회논문집
    • /
    • 제6권2호
    • /
    • pp.32-42
    • /
    • 1998
  • Lean burn gasoline engine is recognized as a promising way to meet better fuel economy. Lean burn engine is classified into port injection and direct injection(DI), DI is more active technique for improving fuel economy with ultra-lean operation, Nowadays, port injected lean burn engine has been produced by many Japan maker. Also, DI engine is also possible for production owing to improvement in control technique of spray, flow air fuel ratio. DI engine uses either homogeneous stoichiometric mixture or stratified mixture by controlling injection timing to be early or late respectively. HM(homogeneous mixture) is worse than SM(stratified mixture) in view of ultra-lean operation in partical load and Nox reducion by using EGR control. But, HM has advanteges in cold starting and emission reduction during transient operation, This paper describes experimental variables and bench test results of HM GDI engine.

  • PDF

EFFECT OF GINGER RHIZOME EXTRACT ON TENDERNESS AND SHELF LIFE OF PRECOOKED LEAN BEEF

  • Kim, K.J.;Lee, Y.B.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제8권4호
    • /
    • pp.343-346
    • /
    • 1995
  • The inclusion of crude ginger rhizome (zingiber officinale) extract at 0.5 to 1.0% (v/w) in the marination of marginally acceptable lean beef improved meat tenderness by 20-30% in the absence of 2% salt and by 35-45% in the presence of 2% salt. Ginger extract also retarded the development of rancidity and increased shelf-life of precooked lean beef two-fold in saran-wrap (no vacuum) storage at $4^{\circ}C$. Ginger rhizome improves the palatability and acceptability of lean beef from carcasses of marginal quality. It is particularly beneficial for the preparation of pre-cooked ready-to-eat beef products that are not vacuum-packaged.

Six Sigma and Lean Manufacturing - A Merger for Worldclass Performance, but is it Really Talking Place?

  • Kroslid, Dag
    • International Journal of Quality Innovation
    • /
    • 제2권1호
    • /
    • pp.87-105
    • /
    • 2001
  • More than a decade after their development and first wave of deployment, Six Sigma and Lean Manufacturing have recently returned on the corporate agendas of a larger number of corporations across industries and supply chains. In the wake of their re-surge, this commentary addresses the evolution, context, content and deployment patterns of the two distinct management concepts. It also analyses claims in the business press that a merger is taking place between Six Sigma and Lean Manufacturing. Here, it is found that there is not enough evidence to broadly support such claims, and it is only concluded that there is some evidence of an early tend towards a merger and that a possible merger would have many synergies and advantages. Finally, an example from a Scandinavian manufacturing company is provided that explains how Six Sigma and Lean Manufacturing can be used in a beneficial way for companies to reach world-class performance.

  • PDF

플라즈마 응용 고 에너지 점화 시스템 개발 및 적용 (Development and Application of High Energy Ignition System Using Plasma)

  • 강혜현;최두원;박진일;이종화;박경석;안종영
    • 한국자동차공학회논문집
    • /
    • 제22권3호
    • /
    • pp.148-156
    • /
    • 2014
  • This study is a follow-up study of "Development of Plasma Ignition System" was presented at the 2013 KSAE spring conference. This study compares lean limit of conventional ignition system with plasma ignition system on constant volume combustion test & Engine Combustion test.

종합군수지원(ILS) 측면의 린 메인터넌스 프레임워크, 정비 전략 제시 및 린 예방정비(PM) 사례 연구 (Lean Maintenance Framework, Maintenance Strategy for ILS and Case Study on Lean PM)

  • 임재훈;서양우
    • 한국산학기술학회논문지
    • /
    • 제15권9호
    • /
    • pp.5502-5512
    • /
    • 2014
  • 최근까지의 종합군수지원 개발은 정비계획, 지원장비, 보급지원, 군수지원교육 등 ILS 지원성요소의 개발, 획득에 주로 초점을 두었다. 이제는 장기적인 관점에서 무기체계의 운용유지와 총수명주기관리체계(TLCSM)와 같이 지속유지성을 강조하는 제도 등을 고려하여 지원성 분야의 효율성 증대, 비용절감 등 린(LEAN) 관점에서 지원성 전략과 정책이 필요할 때이다. 본 논문에서는 ILS 이론, 린 개념, 린 메인터넌스의 이론적 배경을 살펴보고 이를 바탕으로 군수지원 측면의 린 메인터넌스 프레임워크를 제시하고 정비 전략을 제시하였다. 또한 레이더 체계의 금속형 필터에 대한 린 예방정비(PM) 사례를 정비 시간, 정비 인시, 정비 비용 3가지 측면에서 분석하였다. 마지막으로 무기체계의 지원성요소 측면에서 추진 방향을 제시하였다.

쇠고기 등급판정을 위한 이동형 컴퓨터시각 장치 및 살코기 추출 알고리즘 개발 (Development of Mobile Type Computer Vision System and Lean Tissue Extraction Algorithm for Beef Quality Grading)

  • 최선;;황헌
    • Journal of Biosystems Engineering
    • /
    • 제30권6호통권113호
    • /
    • pp.340-346
    • /
    • 2005
  • Major quality features of the beef carcass in most countries including Korea are size, marbling state of the lean tissue, color of the fat and lean tissue, and thickness of back fat of the 13th rib. To evaluate the beef quality, extracting loin parts from the sectional image of the 13th beef rib is crucial and is the first step. However, because of the inhomogeneous distribution and fuzzy pattern of the fat and lean tissues on the beef cut, it is difficult to extract automatically the proper contour of the lean tissue. In this paper, a prototype mobile beef quality measurement system, which can be implemented practically at the beef processing site was developed. The developed system was composed of the hand held image acquisition unit and mobile processing unit mounted with touch-pad screen. Algorithms to extract the boundary of the lean tissue and a proper tool to evaluate the marbling status have been developed using color image processing. The boundary extraction algorithm showed successful results for the beef cuts with simple and moderate patterns of the lean tissue and fat. However, it had some difficulty in eliminating complex pattern of the extraneous tissues adhered to the lean tissue in the boundary extraction. The developed algorithms were implemented to the prototype mobile processing unit.

Product-Mix Decision Using Lean Production and Activity-Based Costing: An Integrated Model

  • MOHSIN, Nidhal Mohammed Ridha;AL-BAYATI, Hossam Ahmed Mohamed;OLEIWI, Zahra Hasan
    • The Journal of Asian Finance, Economics and Business
    • /
    • 제8권4호
    • /
    • pp.517-527
    • /
    • 2021
  • While the two principles of lean manufacturing and time-driven activity-based costing (TDABC) have been established out of multiple incentives and do not follow the same particular targets, there is substantial commonality between them. In these conditions, the supply management of a multi-product system needs a rigorous production model to minimize costs. In this sense, this paper proposes an interactive model with the consideration of optimizing product-mix decisions using both lean development tools and TDABC. This paper proposes a qualitative approach using the case study of the Iraqi state company for battery production. The suggested model decreased manufacturing time and costs, along with some substantial reduction in idle production capacity by 26 percent in 2019, based on the findings of the case study. On the other hand, the proposed model gives two side advantages: an efficient division of costs on goods due to the use of time spent as a cost factor for products and cost savings due to the introduction of the lean manufacturing approach that reduces all additional costs and increases product-mix decisions. Furthermore, the analytical data gathered here suggests that the incorporation of lean management concepts and TDABC has a strong and important influence on product-mix decisions.