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김진곤(Jingon Kim),최성배(Sungbae Choi),박용국(Yongkuk Park) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Thousands of lives are saved in high-speed automobile accidents due to the passive safety system, such as airbags and seatbelts. The development of the automotive industry has lead to enormous developments in safety, specially airbag design and technology. In this study, the patent trend of the passive safety system applied for the Patent Bureau of Korea, Japan and USA, has been analyzed. It is envisaged that this study may serve as a stepping stone for further advancement in passenger protection systems.
박호일(Hoil Park),최성배(Sungbae Choi),장성식(Seongsik Jang),황준영(Junyoung Hwang) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
There are several flow noises induced from compressors of automotive turbochargers. In the previous study, the flow noise was analyzed to be around 1.6k~1.8kHz from gasbench tests, and could be reduced by machining a proper rectangular groove around compressor inlet before its main blades. The groove was shown to be very effective for removing the noise under the small difference of compressor performance. It was all right because the engine performance was high enough to cover the difference. This study was interested in another flow noise, rather the higher and wider frequency band, 4k~6kHz ? the 3<SUP>rd</SUP> order of turbocharger speed, and proposed an optimal configuration of the groove, lowering the noise and maintaining the performance. A best shape was proposed, and was confirmed to be satisfied with the performance on an engine dynamometer and the noise target on a vehicle.