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Hot Spot의 시각적 분석을 통한 Hot Judder 저감의 실험적 연구
조상운(Sangwoon Cho),황선덕(Sunduk Hwang),장진성(Jinsung Jang),이정주(Jungju Lee),권성욱(Sungwook Kwon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper introduces hot judder, among the issues of NVH braking system, caused by hot spot on disc that generates unpleasant, anxious experience to the driver. Hot Judder generates around low frequency, effected by order analysis from the velocity of disc rotation. It is a phenomenon, which caused by occurrence of hot spot due to friction between disc and pad. Hot spot is the cause of the hot judder vibration. It transferred chassis, brake pedal and steering that is generated judder vibration. This study analyzes the cause of hot judder, according to the shape and property of a brake pad (type of slot, size of chamfer, compression rate and under layer). Thermal IR camera was used to visual analysis thermal behaviour and hot spot generation of disc. Correlation of DTV, BTV and thermal visual analysis were studied to analyze the cause of hot judder reduction.
브레이크 면압 분포와 스퀼 노이즈의 상관성에 관한 연구
정원태(Wontae Jeong),박정민(Jeong min Park),김흥섭(Heuhgseob Kim),조상운(Sangwoon Cho) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Spragging suggested by Spurr in 1971 is one of the major explanations on the generation mechanism of squeal. Geometric center of pressure at friction surface leading center of normal force induces instability that is explained by spragging theory. Pressure distribution is also affects thermal instability and wear. Recently, digital measurement of pressure on the brake friction surface enabled research on the relation between contact pressure and squeal propensity in situ. In this study, pressure distribution at the pad/disc interface, wear after post-fade mode and squeal noise were measured at the chassis dynamometer. The results of static and complex eigenvalue analysis were compared to the experimental results. Modified backplates to control pressure distribution result in change of the squeal propensity. It is shown that the lateral center of the pressure is proportional to the real part of the eigenvalue of the complex eigenvalue of analysis by DOE study.