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정근중(Geun Joong Jeong),김대환(Dae Hwan Kim),송현우(Hyun Woo Song) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
The function of brake system is to reduce vehicle speed or to stop a vehicle by the friction of brake pad and disc rotor. Generally, brake noise has three categories, low frequency noise, low frequency squeal and high frequency squeal. Brake noise during braking continues to be one of the important quality problems. Many researches have been carried out on the brake noise that occurs during braking. The purpose of this study is to review various factors occuring brake noise by experimental case studies.
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),김향래(Hyangrae Kim),최희범(Heebum Choi),윤동주(DongJood Yoon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this paper is to study the effect of heat treatment conditions of discs on braking performance of brake pad. The test discs are manufactured to apply different heat treatment conditions. And friction materials for racing (Semi-Metallic type) are used as a counter material. It is observed physical properties and friction performance as thermal conductivity, hardness, tensile strength, coefficient of friction, fade, wear etc. The experimental results shown that coefficient of friction of the heat-treated discs are higher than the unheat-treated disc.
Disc Rotor의 Graphite 길이가 마찰 특성에 미치는 영향 연구
정근중(Geun Joong Jeong),김대환(Dae Hwan Kim),송현우(Hyun Woo Song) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
The purpose of this study is to investigate the friction characteristics of brake pads according to different graphite flake lengths of disc rotors. The friction characteristics of brake pads were tested using 1/5 reduced scale tester. With increasing of the graphite length of the disc strength and hardness of the disc rotors decreased, and thermal conductivity of the disc brake pads increased. Natural frequencies moved lower frequencies and damping ratio of the disc rotor increased. In P1 brake pad, the friction coefficient was lower as increasing the graphite length of the disc but the noise propensity was not related with the graphite length. In P2 brake pad, the friction coefficient was higher and the noise propensity was lower with increasing of the graphite length.
티탄산칼륨 Morphology에 따른 마찰재 제동 특성 연구
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),최희범(Heebum Choi),김향래(Hyangrae Kim),허명준(Myeong-jun Heo),정진오(Chung Jin-Oh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
the purpose of this paper is to study the effect of morphology of potassium titanates on the friction characteristics in the NAO(Non Asbestos Organic) brake pad. 3 potassium titanates are selected and test pieces are manufactured by hot press forming. It is observed physical properties and friction performance as density, hardness, average coefficient of friction, fade, wear etc. In fade, the coefficient of friction of non fiberous potassium titanates is more stable than that of fiberous potassium titanate. In wear and disc roughness, fiberous potassium titanate is better than non fiberous potassium titanates.
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),김향래(Hyangrae Kim),최재희(Jae-Hee Choi),최광표(Gwang-Pyo, Chio),성경필(Kyung-Pil, Seong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
NAO(Non Asbestos Organics) friction materials were investigated to study the role of metal sulfide lubricants on the friction performance. Four different metal sulfide lubricants including SbS₂, MoS₂, FeS and SnS were employed in this investigation. The tribological properties of friction materials like coefficient of friction, braking temperature, noise and wear were evaluated on a scale tester. In effectiveness, S4(SnS) shows better performance in low speed and S1(Sb₂S₃) shows good performance in high speed . S2(MoS2) and S3(FeS) show good noise property.
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),최희범(Heebum Choi),김향래(Hyangrae Kim),운동주(Dong-Joo Yoon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The purpose of this paper is to study the effect of heat treatment conditions of discs on the friction characteristics in the disc brake system. Test pieces are manufactured to apply different heat treatment conditions. It is observed physical properties and friction performance as thermal conductivity, hardness, tensile strength, coefficient of friction, fade, wear etc. The thermal conductivity of the unheat-treated disc is higher than that of heat-treated discs. In fade, the coefficient of friction of the unheat-treated disc is higher than that of heat-treated discs because of lower braking temperature.
BaSO₄와 CaCO₃가 자동차용 Brake Pad의 마찰 특성에 미치는 영향 연구
정근중(Geun Joong Jeong),김향래(Hyang Rae Kim),김대환(Dae Hwan Kim),송현우(Hyun Woo Song),최형기(Hyeoung Gi Choi) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
The purpose of this study is to investigate the firction characterisctcs of brake pads according to different ratios of BaSO₄/CaCO₃. Four brake pads with different ratios of BaSO₄/CaCO₃ were manufactured. The friction characteristics of brake pads were tested using 1/5 reduced scale tester. With increasing of the amount of BaSO₄ density and shear strength of brake pads were increased and hardness of brake pads were decreased. In effectiveness, the fricton coefficient of brake pad was higher and the stability of firction coefficient was better as the ratio of BaSO₄ increased. In fade test, friction coefficient of B3 sample used only CaCO₃ was decreased rapidly. B1 sample showed a good noise performance without noise generation. The wear resistance of samples were decreased with increasing of the ratio of CaCO₃.
Disc Rotor의 표면 가공에 따른 마찰 특성 연구
정근중(Geungjoong Jeong),송현우(Hyunwoo Song),최희범(Heebum Choi),김향래(Hyangrae Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
the purpose of this paper is to investigate the friction characteristics according to surface processing methods of disc rotors. To avoid the trial and error method and find easily the main factor which contributes friction characteristics, taguchi method is employed to analyze test results. It is used taguchi L8(2<SUP>**</SUP>7) orthogonal matrix and evauated friction characteristics by scale tester.. By adapting taguci method, it is easy to investigate the influence of each factor in disc rotors. After analyzing the test results, the effect of factors and levels influenced friction characteristics is studied.