http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
열적 탄소성을 이용한 브레이크 디스크의 열 응력 및 변형 해석
김춘휴(Choonhyu Kim) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Under braking, the lower frequency vibration in brake system happens due to the brake torque variation(BTV). This vibration called the judder is classified with the cold judder and the hot judder. This paper deals with the coning deformation which is related to the hot judder. Thermal energy generated under the braking condition is partitioned with the heat penetration coefficient of the disc and pad. Accordingly, the brake disc absorb the generated energy about 98%. From the results of the computational fluid dynamics(CFD) analysis for the brake disc, the heat transfer coefficient(HTC) is higher at an entrance of the vent hole than at an exit. And the HTC is uniform on the disc plate. From the results of the transient heat transfer analysis for the brake disc which use the thermal material properties, the temperature variation is larger on the face of disc plate than in the internal point of a brake disc. And the outer plate has the compressive stress under braking condition, but it has the tensile stress under the cooling condition to room temperature. Particularly, the neck has the largest stress. In the case that the stiffness at the neck increase by extending the vanes of the vent hole to the neck, it’s found that the coning deformation of the brake disc is reduced.
한정훈(Jeonghun Han),한일현(Ilhyun Han),김춘휴(Choonhyu Kim),유철하(Chul-Ha Yu) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
A pickup truck with rear banjo type axle has a problem of lock-up booming noise and vibration which is caused by rear axle pitch mode and frame bending mode at low rpm. This paper classifies the problem and suggests for countermeasure in view of source, transfer path and response.