• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2000.11a
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• pp.8-8
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• 2000

하이드라진 단기액체엔진을 장착하고 궤도에서 임무를 수행하고 있는 다목적실용 위성 추진시스템 궤도비행 초기운용 자료에 근거하여 추진제 소모율을 산정 한다. 추진시스템은 위성의 궤도각과 비행고도 조정을 위한 속도증분($\Delta$V) 및 자세제어를 위한 추력을 발생시킨다. 단기액체 추진시스템에서 추진제 소모량은 추력기 밸브의 개폐시간에 비례하고 추력 생성 효율은 추진제의 연소기 유입압력에 종속한다. 일정질량의 가압 기체 압력에 의해 연료를 공급하는 추진시스템에서 잔류 추진제 량의 감소는 연소기 유입압력의 감소를 유발하고 추진기관의 효율을 저하시키는 요인으로 작용하여 임무말기로 진행함에 따라 동일한 운동량 생성에 보다 많은 연료소모가 이루어진다.(중략)

• International Journal of Highway Engineering
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• v.13 no.3
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• pp.185-193
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• 2011

As a Lift axle is an additional axle installed mostly in heavy freight truck, It"s introduced for the purpose of cost saving, such as logistics, fuel, tire wear and prevention of the pavement damage. However, the Effects of a lift axle are anecdotal and they have occurred often that a lift axle is used improperly by expectations of some drivers. For these reasons, this study conducts a field experiment in order to identifying the change rate of fuel consumption due to an a Lift axle using, develops the fuel consumption model of field data, and then compares the effects of a Lift axle using through application of the model. As a result, fuel consumption decreased in loading conditions that are both empty and full when not using a lift axle.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.9 no.3
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• pp.59-66
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• 2010

Around a toll plaza, vehicles do such maneuvers as slow down, stop, and speed up to pay their tolls when they use ordinary toll gates. They can be expected more fuel consumptions compared to the vehicles which use the Hi-pass, a Korean type of Electronic Toll Collection System(ETCS). To measure the exact amount of difference between the two gas consumptions, we equipped a test vehicle with a measurement system and constructed a model toll gate on our test field. Through the field tests on fuel consumptions, we could confirm a 36.7 % of energy saving when the test car used the Hi-pass. Then we projected the result on the total traffic volumes which had used national expressway network for five months from January 2009. Projected to the whole traffic, potential cost savings reached 5.34 billion won. We expect this result be frequently mentioned of to prove the fuel efficiency of the Hi-pass system.

• Journal of Advanced Navigation Technology
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• v.27 no.5
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• pp.649-657
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• 2023

ICAO adopted the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) at the 39th General Assembly in 2016, and 115 countries, including South Korea, expressed their intention to participate in CORSIA as of January 1, 2023. Since carbon generated in the aviation industry is mainly caused by greenhouse gases emitted from aircraft engines, fuel consumption must be reduced to reduce carbon emissions. Prior research, such as simulation, is essential to predict the effectiveness of each plan and to make decisions about its implementation. High-quality data is needed to derive accurate results, but it has been difficult to secure actual fuel consumption data, as they are considered to be classified airline data. Therefore, in this paper, after establishing a model that estimates fuel consumption based on actual fuel consumption data, the model is to be advanced to improve its accuracy.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.652-655
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• 2008

차량 및 운전자를 효율적으로 관리하면 운행에 따른 연료소모량을 감소할 수 있으며 유류비를 줄이고 배출가스를 감소시켜 친 경제 및 친 환경 주행을 할 수 있다. 그러나 차량 및 운전자를 효율적으로 관리하기 위한 구체적인 정보가 부족하다. 따라서 본 연구에서는 실 차량에 차량 및 운전자 관리 시스템 단말을 설치하고 실제 주행 중에 수집된 차량 정보를 분석하여 연료소모에 관련된 요소들을 분석하였고, 친 경제 및 친 환경을 지원하기 위한 구체적인 가이드라인을 제안한다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.110-111
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• 2019

본 논문은 DC 배전 전기 추진 시스템으로 건조된 10톤급 소형 어선을 운항하며 계측한 실험 결과를 제시한다. DC 배전 선박과 모의된 AC 배전 선박을 일반적인 10톤급 소형 어선의 운용 패턴에 따라 운항하였고, 각 경우의 연료소모량을 유량계로 측정하였다. DC 배전 시스템은 가변속으로 인한 엔진의 효율적인 운전과 전기설비 무게 감소로 인한 추진 부하 감소의 효과로 AC 배전 시스템에 비하여 연료사용량이 약 20% 가량 절감된다. 실험 결과, DC 배전 전기 추진 선박을 적용할 시 연간 약 18,500L (22.0%)의 연료가 절감되어 연료비가 매년 약 1400만원 가량 절약될 것으로 예상된다.

• Journal of Astronomy and Space Sciences
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• v.7 no.1
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• pp.37-45
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• 1990

It was investigated that the effect of zonal harmonics to transfer orbit. Since parking orbit is located at low altitude, the zonal harmonics affects transfer orbit relatively high sense. So under the zonal harmonics, eccentricity and semi-major-axis which were related orbit altitude at the first hand, were investigated. As a result the zonal harmonics increases the altitude of apogee of transfer orbit. So if the zonal harmonics is considered in orbit transfer the fuel can be saved a little.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.4
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• pp.273-279
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• 2021

Winglets are specialized wingtip devices to reduce induced drag, and they have been installed on Boeing-made aircraft since the 1980s, Airbus has also developed a winglet named 'Sharklet' since 2009 and has started providing them as an option to the A320 Family. The winglet has the effect of improving take-off performance, reducing fuel consumption, increasing payload, and increasing flight distance by reducing the induced drag generated at the tip of the wing. The purpose of this study is to analyze the actual flight data of the sharklet-installed and non-sharklet-installed models of the A321 aircraft to verify the fuel efficiency improvement due to the winglet installation, and to analyze the economic analysis accordingly. Through this, it can be used to determine the winglet installation when introducing an aircraft or to make a decision for upgrading the existing aircraft. To this end, a case study on the aerodynamic characteristics and effects of the winglet installation was conducted, and the economic analysis was verified.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.1
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• pp.13-20
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• 2022

Aircraft weight is an important factor affecting performance and fuel efficiency. In the conceptual design stage of the aircraft, the process of balancing cost and weight is performed using empirical formulas such as fuel consumption cost per weight in estimating element weight. In addition, when an airline operates an aircraft, it promotes fuel efficiency improvement, fuel saving and carbon reduction through weight management activities. The relationship between changes in aircraft weight and changes in fuel consumption is called the cost of weight, and the cost of weight is used to evaluate the effect of adding or reducing weight to an aircraft on fuel consumption. In this study, the problems of the existing cost of weight calculation method are identified, and a new cost of weight calculation method is introduced to solve the problem. Using Breguet's Range Formula and actual flight data of the A350-900 aircraft, two weight costs are calculated based on take-off weight and landing weight. In conclusion, it was suggested that it is reasonable to use the cost of weight based on the take-off weight and the landing weight for other purposes. In particular, the cost of weight based on the landing weight can be used as an empirical formula for estimating element weight and optimizing cost and weight in the conceptual design stage of similar aircraft.

• 한국방재학회:학술대회논문집
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• 2010.02a
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• pp.45.2-45.2
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• 2010

자동차 주행 시 엔진회전수가 1,500rpm 이상이고 주행속도가 50km/hr 이상의 조건에서 가속 페달을 밟지 않은 상태로 관성주행(타행주행)을 하면 연료분사량이 "0"이 되고 그에 따라 엔진 배출 $CO_2$ 배출량도 "0"이 된다. 본 연구에서는 고속도로 및 자동차 전용도로에서의 이러한 연료차단(퓨얼컷 fuel-cut) 주행 구간을 찾고 연료차단 기능을 활용하는 경우 그 효과를 평가하였다. 본 시험의 결과 퓨얼컷 주행을 활용하면 약 4~5% 정도의 $CO_2$ 배출량을 줄일 수 있음을 알 수 있었고, 감속의 정도를 도로 상황에 맞게 최적화하는 경우 감소율을 더욱 향상시킬 수 있을 것으로 판단된다. 추후 본 시험의 결과를 이용하여 도로 내리막 구간에서 연료소모량 및 $CO_2$ 배출량을 저감하면서도 과속으로 인한 사고를 예방하는 방안으로 활용할 수 있을 것으로 판단된다.