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조호준(Ho-Joon Cho),김명구(Myoung-Gu Kim),맹주원(Ju-Won Maeng),조종두(Chong-Du Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In this experimental paper, the juddering of automotive disk brake was analyzed by the finite element method, and compared with the experimental results. The relationship between specific modes of disk and pad, and hot spot were investigated. The characteristics of judder vibration were measured by using chassis-dynamo and the hot spots were photographed by using high-speed infrared camera. The vibration modes of the disk and pad were measured and a specific relationship between mode shape and hot spots was found. Results show that the judder vibration occurred due to the frequency modulation of the specific mode frequency of disk brake due to the non-linearity phenomenon. This relationship was analyzed by the frequency analysis of judder vibration.
디스코 브레이크에서 열섬 현상이 발생되는 원인과 저더진동에 미치는 영향
조종두(Cho, Chong-Du),김명구(Kim, Myoung-Gu),조호준(Cho, Ho-Joon) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.8
Hot spot phenomenon is caused by non-uniform contact area between brake pad and disk frequent braking. Brake disk deformed by locally concentrated heat increases magnitude of frictional vibration. And this deformation can highly influence the judder vibration. In this experimental study, vibration and hot spot was measured in accordance with rotation of disk and pressure of master cylinder for finding the factors that causes hot spot phenomena. For comparing hot spot aspects with mode shapes of disk, mode shapes were measured by conducting modal test, and analyzed by using finite element analysis. Relation between hot spot phenomenon, and mode shape, pressure of master cylinder and rotation speed of disk respectively, was achieved by hot spot measurement and frequency analysis.