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박호일(Hoil Park),엄상봉(Sangbong Eom),황준영(Junyoung Hwang),윤태진(Taejin Yoon) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
A noise map has been developed for globally analyzing special noises radiating from automotive turbochargers. This map could be obtained by replacing the efficiency with noise data in a compressor performance map. The characteristics of a special noise could be easily understood from it since the noise distribution was shown on their operating area. Turbochargers were generally operated under constant speeds for measuring their performance. This paper compared two additional operation modes to the constant speed for the noise map. First, it was operated for almost constant volumetric flow rates in a compressor. Second, it was done for constant pressure ratios. In addition, it was investigated how the maps would be changed by the different sweeping times of surge-to-choke at the constant speeds, 1/2 and 1/4 times of the reference period.
박호일(Hoil Park),김형진(Hyungjin Kim),강수영(Suyoung Kang),엄상봉(Sangbong Eom) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A noise map drawing technology was developed for analyzing noises radiating from turbochargers of vehicles engines. The map was obtained by superposing turbocharger noise data onto a compressor performance map. The characteristics of a special noise could be easily understood with it since the noise distribution was shown on the turbocharger operation area. It was shown on the map for the turbocharger of a passenger car engine that the special noise were abruptly increased over a certain turbocharger speed, and the range of the high level noise became wider as the speed increased. It was possible to analyze engine operation area causing the turbocharger noise problem by plotting an engine operation line to the noise map. Furthermore, the map could propose a proper engine operation line not causing the noise problem by comparing it and turbocharger noise contours. This paper showed that a turbocharger noise problem could be solved by limiting an engine operation line with the turbocharger noise map and the line plotted on the map.