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연소압력 신호처리를 통한 디젤엔진 연소음 지수 및 제어 알고리듬 개발
진재민,이동철,정인수,Jin, Jaemin,Lee, Dongchul,Jung, Insoo 한국음향학회 2016 韓國音響學會誌 Vol.35 No.3
엔진 연소 거동을 제어 및 개선하기 위하여, 연소실 내의 압력에 대한 다양한 연구가 지속적으로 수행되고 있다. 이 논문에서는 연소실 내의 압력을 통하여 디젤엔진의 연소음 레벨을 추정하였으며 이를 연소음 지수라고 정의하였다. 연소음 지수는 연소실 내의 압력신호를 고속 푸리에 변환을 통하여 계산하였으며 그 유효성을 검증하였다. 검증된 연소음 지수를 기반으로 한 제어기가 개발되었으며 차량에 탑재하였다. 연소음 지수의 목표 값을 만족시키기 위하여 일부의 분사변수를 제어하였으며 차량 연소음이 특정 주파수 영역에서 4.0 dB(A)까지 개선되었다. To control and improve a combustion behavior of an engine, various studies for the in-cylinder pressure have been consistently carried out. In this paper, the level of the combustion noise for a diesel engine is estimated from the in-cylinder pressure and defined as the combustion noise index. The combustion noise index is calculated from the FFT(Fast Fourier Transform) of the in-cylinder pressure and its validity is verified. The control system based on the combustion noise index is developed and implemented in a vehicle. A number of injection parameters are controlled to meet the desired combustion noise index, and the combustion noise of a vehicle is improved up to 4.0 dB(A) in the specified frequency band.
금속섬유 DPF 시스템 최적화를 위한 CFD 시뮬레이션 연구
진재민(Jaemin Jin),누엔 후 트럭(Nguyen Huu Truc),박정규(Jungkyu Park),이세영(Seyoung Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Diesel Particulate Filter (DPF) system is one of the promising methods to reduce diesel engine exhaust particulates which cause environmental pollution. Metal fiber DPF system cheaper and more enduarable than ceramic filter, the regeneration near the wall (outer layer) is difficult beause of the heat loss and the less gas flow rate near the wall. The uniform flow across the filter is very important to increase the regeneration efficiency of the DPF system. A 3D CFD simulation is performed to investigate the effects of major factors on the mass flow through the channel of each metal fiber filter layers. The major factors are change of filter porosity, various porosity of layer, distribution plate shape, size, location and swirler. The flow control by both of the distribution plate and swirler together was effective. In this work, the shape of the distribution plate and swirler are optimized through the CFD simulations.
정인수(Insoo Jung),진재민(Jaemin Jin),이동철(Dongchul Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
To meet market needs for environment-friendly vehicles, diesel passenger vehicles should be developed to comply with lower fuel consumption and more stringent standards for exhaust emission. However, it is difficult to develop diesel combustion noise that has the trade-off relationship with fuel consumption and exhaust emission. Combustion noise seriously impacts on the perception of sound level and sound quality of vehicle interior noise. Generally, the combustion noise would be improved through developing methods as modifying engine components and optimizing injection parameters. However, displaying active responses to changes in factors such as engine aging and variations of fuel properties is difficult because these methods are based on an open-loop way to focus on the present status. To resolve this situation, closed-loop control by using engine vibration signal will be developed in the near future. This paper describes future technique and method to develop the combustion noise of a diesel engine.
연소최적화를 통한 EURO 5 승용디젤차량 연소음 개발
이동철(Dongchul Lee),정인수(Insoo Jung),진재민(Jaemin Jin),강구태(Kootae Kang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The optimization of injection parameters was performed to improve the combustion noise without deterioration of exhaust gas emission. The DoE(Design of Experiments) methods was used to minimize the number of tests and create experimental models. The injection parameters were optimized by the models obtained. Driving modes of a passenger vehicle with a diesel engine were simulated at anechoic chamber to verify the exhaust emissions and the combustion noise levels. The level of the combustion noise was reached to the development target with maintaining the exhaust emissions. This paper describes a new experimental approach for developing the combustion noise and illustrates some examples of results obtained.
희박 예혼합 가스터빈 연소기 3 차원 전산 해석 및 화학반응기 네트워크에 의한 NOx 예측
이재복(Jaebok Yi),정대로(Daero Jeong),허강열(Kang Yul Huh),진재민(Jaemin Jin),박정규(Jungkyu Park),이민철(Min Chul Lee) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.12
희박예혼합 가스터빈 연소기에 대한 3 차원 RANS 해석을 수행하였으며 PCFM(Partially Premixed Coherent Flame Model) 화염면적밀도 생성항 상수의 보정을 통하여 희박연소조건을 모사하였다. PCFM 에서 계산된 화염면적밀도에 의해 층류 예혼합 화염의 전파를 예측하고 불균일하게 분포한 기연 가스의 물성을 평형 가정에 따라 예측하였다. 복사와 대류 열전달을 모사하기 위해 냉각 조건으로서 실험과의 비교를 통해 결정된 열유속을 적용하였다. 이러한 3 차원 해석 결과를 바탕으로 파일럿 노즐과 메인 노즐에 분배되는 연료량 비에 대한 민감도 조사를 수행하였으며 CRN(Chemical Reactor Network)을 구성하여 NOx 배출량을 예측하고 측정값과 비교 분석하였다. This paper presents 3D simulation by STAR-CCM+ for lean premixed combustion in a stationary gas turbine combustor with separate pilot and main nozzles. The constant for the source term in the flame area density transport equation was modified to account for a low global equivalence ratio and validated against measurement data. A Partially-premixed Coherent Flame Model(PCFM) involves propagation of a laminar premixed flame with the predicted flame surface density and equilibrium assumption in the burned gas with spatial inhomogeneity. The conditions for cooling by radiation and convection are considered for accurate determination of the heat flux on the wall. A parametric study is of the pilot-fuel-to-total-fuel-ratio is carried out. A chemical reactor network (CRN) was constructed on the basis of the 3D simulation results and compared against measurements of NOx.