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압축착화 디젤엔진의 모사 EGR 시스템에 의한 소음 특성 변화 분석
박범 ( B Park ),윤성준 ( S Yoon ),박성욱 ( S Park ),박준흥 ( J Park ) 한국분무공학회 2014 한국액체미립화학회지 Vol.19 No.4
Experimental study was conducted to investigate the effect of EGR(exhaust gas recirculation) on engine noise using single cylinder combustion ignition engine. Under constant engine rotary speed of 1200 RPM, 8 mg fuel quantity was injected with 15, 18 and 21% of oxygen ratio and 1400 bar of injection pressure. Using the in-cylinder pressure data acquired by a piezoelectric transducer, the engine performance parameters were calculated. Radiated engine noise measured for 10 seconds was analyzed using spectral characteristics and sound quality metrics such as loudness, sharpness, roughness. From the obtained engine performance parameters and sound quality metrics, effect of oxygen ratio of the premixed air, start of injection timing on frequency characteristic and sound quality metrics were analyzed. Correlation analysis was conducted between MPRR(maximum pressure rise rate), RI(ringing intensity) and sound quality metrics. RI was identified as the most important factor having influence on the sound quality metrics.
폐활성슬러지의 호기성 소화 처리시 상징액특성에 관한 연구
고광백,임성균,박준흥,정연규 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.2
The main aim of this treatise is to put on observation about the supernatants during aerobic digestion, especially, the effects of pH and different solid levels on the characteristics of supernatants. Laboratory batch experiments were carried out at 20℃ and pH 7.5±0.2 on the aerobic digesion of waste activated sludge at different solid levels. As the results, this research could show that NH₄-N concentration was reduced at the fixed pH 7.5, that soluble nutrients and organics were smaller than in the general case of anaerobic digesion, and that high solid level can make supernatants poor.