http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유전알고리즘을 이용한 디젤엔진의 연소최적화 기법에 대한 연구
김동광(Dong-Kwang Kim),조남효(Nam-Hyo Cho),차순창(Soon-Chang Cha),조순호(Soon-Ho Cho) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Optimization of engine design and operation parameters using a genetic algorithm was demonstrated for direct injection diesel engine combustion. A micro genetic algorithm and a modified KIVA-3V code were used for the analysis and optimization of the engine combustion. At each generation of the optimization step the micro genetic algorithm generated five groups of parameter sets, and the five cases of KIVA-3V analysis were to be performed either in series or in parallel. The micro genetic algorithm code was also parallelized by using an MPI programming, and a multi-CPU parallel supercomputer was used to speed up the optimization process by four times. An example case for a fixed engine speed was performed with six parameters of intake swirl ratio, compression ratio, fuel injection included angle, injector hole number, SOI, and injection duration. An optimization technique for the whole range of engine speeds would be suggested for further studies.<br/>
대형디젤엔진의 열적 피로안전도 분석을 위한 유한요소해석
이상업(Sang-Up Lee),이상규(Sang-Kyu Lee),조남효(Nam-Hyo Cho),차순창(Soon-Chang Cha),조순호(Soon-Ho Cho) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Finite element analysis was performed to analyze structural safety of a new heavy-duty direct injection diesel engine. A half section of the in-line 6-cylinder engine was selected as computational domain. A mapping method was devised to project heat transfer coefficients from CFD results of engine coolant flow onto the FE model. The accurate setting of thermal boundary condition on the FE model resulted in improved temperature distribution. Numerical solutions of cylinder bore distortion and stresses were obtained by using the thermal condition. High Cycle Fatigue was analyzed by assuming the engine was operated under the five loading conditions repeatedly; assembly force, assembly force with thermal loading, alternating maximum gas pressure loading at each cylinder combined with assembly force and thermal loading. Distribution of safety factor was calculated by using a Haigh diagram for which the maximum and the minimum stresses were selected from the five loading cases.