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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.
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박호일(Hoil Park),최성배(Sungbae Choi),장성식(Seongsik Jang),황준영(Junyoung Hwang) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.8
In the previous study, the air flow noise around 1.6 k~1.8 kHz was analyzed, and could be reduced by machining a groove in the bore of compressor inlet in front of the main blades of a compressor wheel. It was proven that this groove was very effective for removing the noise without critical sacrifice of compressor performance, and in addition, it did not noticeably deteriorate vehicle performance, drivability and acceleration. It is interesting that the type of groove tried for 1.6~1.8 kHz noise reduction could be effective for another air flow noise, 4 k~6 kHz which is the 3rd order frequency range of turbocharger speed. This study tried various shapes of grooves for minimizing engine performance difference as well as reducing the 3rd order noise. Finally, it was shown that the groove should be round for the engine performance, and an optimal size exist for the noise and the engine performance.
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