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브레이크 저더 영향 요소 기여도 분석 및 개선 방향 제시
강수연(Sooyeon Kang),정명구(Myoungkoo Chung),신상하(Sangha Shin),김세혁(Sehyuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The brake judder at the high speed braking is caused by the geometric distortions of the brake rotor. There are difficulties in a developing brake system by the modern technology without the brake judder. Also an optimizing steering and suspension systems for the brake judder may be in conflict with the development of the ride & handling performance. For the customer satisfaction by minimizing steering wheel vibration especially affected by brake judder, car makers need to consider of the effective control factors to develop the steering and suspension system. The effective improvement method is suggested to reduce the brake judder by the CAE analysis of factors contributing to brake judder and its validation test in a vehicle.
차량용 브레이크 시스템의 Low Frequency Noise 해석 연구
조호준(Hojoon Cho),이재한(Jaehan Lee),이종화(Jongwha Lee),정명구(Myoungkoo Chung),오정용(Jungyong Oh),장진희(Jinhee Jang),김인동(Indong Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Brake low frequency noise phenomena (Moan, Groan Noise) are occurred by frictional stick-slip between pads and a rotor. When frictional stick-slip between pads and a rotor is occurred, this excitation source makes resonance of suspension system, which can generate structure-borne noise. Therefore, mechanism of low frequency noise phenomena should be systematically approached and analyzed in many different directions. In this study, automotive brake low frequency noise phenomena were approached and analyzed through three different simulation methods. A complex Eigenvalue analysis, steady state dynamic analysis and dynamic explicit analysis were performed and compared in an automotive drum brake system of trailing arm suspension type. For this, modal testing in the state of vehicle was performed and correlated with finite element analysis. Drum brake system was used in brake squeal noise simulation FE model which were correlated with brake components and sub-assembly modal testing results. Finally, causes of low frequency noise phenomena in this brake system were analyzed through three simulation methods.
Brake Squeal Noise를 유발하는 Brake Contact Interface와 Rotor의 In-Plane Modes에 관한 연구
이종화(Jongwha Lee),조호준(Hojoon Cho),이재한(Jaehan Lee),최원석(Wonseok Choe),김세혁(Sehyuk Kim),정명구(Myoungkoo Chung),오정용(Jungyong Oh),김인동(Indong Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
For many years, brake noise has been one of the top automotive brake warranty issues, and many studies have been conducted to reduce the squeal phenomenon by improving the rotor-pad contact interface or by decoupling modes inducing squeals. This research investigates brake contact interface and rotor in-plane modes which generate brake squeal noise and conduct a robust correlation between CAE and Test by using methods such as the 3D laser vibrometry ODS and modal mapping. This paper considers the different brake contact interfaces affecting low frequency brake squeal and introduce an effective way of reducing the problem by improving one of the brake secondary contacts. On the discussion with the rotor in-plane mode, importance of rotor radial mode on inducing squeal issues and noise risks being introduced by rigid in-plane modes on assembly restraint conditions are topics that are often being left aside on former researches.
Brake Squeal Noise를 유발하는 Brake Contact Interface와 Rotor의 In-Plane Modes에 관한 연구Ⅱ
김경수(Kyungsoo Kim),조호준(Hojoon Cho),김두영(Dooyoung Kim),최원석(Wonseok Choe),박영준(Youngjoon Park),백봉범(Bongbum Back),김한규(Hankyu Kim),고승석(Seungseok Ko),정명구(Myoungkoo Chung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
For many years, brake noise has been one of the top automotive brake warranty issues, and many studies have been conducted to reduce the squeal phenomenon by improving the rotor-pad contact interface or by decoupling modes inducing squeals. This is additional research of ‘A study of Brake Contact Interface and Rotor In-Plane Modes Induced Disc Brake Squeal noise’. This paper considers the different brake contact interfaces affecting high frequency brake squeal and introduce an effective way of reducing the problem by improving one of the brake secondary contacts. Furthermore, the reason of improving of brake secondary contact has a positive effect is investigated by modal analysis & squeal noise analysis.