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- 저자 : 차희범(Heebum Cha) (검색결과 3 건)
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차희범(Heebum Cha),곽철원(Chelwon Kwack),고강호(Kangho Ko) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
The squeal noise is the result of self -excited vibrarion that can occur on most type of brakes. In this paper, there is a suggestion for the mechanism behind the squeal noise generation. Therefore, there is a need for measurements to verify the mode shape of drum brake system. The mode shape is measured on rear drum brake system of small sedan type vehicle, while the drum brake system is mounted on the vehicle and forced by parking brake cable to simulate braking conditions.
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[진동 소음부문] 마찰로 인한 디스크 브레이크의 유한요소 열탄성 불안정성 해석
최지훈(Jihoon Choi),김도형(Dohyung Kim),이인(In Lee),차희범(Heebum Cha),강민구(Mingu Kang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
A finite element analysis is performed to investigate frictionally excited thermoelastic instability in automotive disk brakes. This instability leads to the localized high temperature contact regions such as hot spots in the automotive brake. It is assumed that linear perturbations on the constant speed solution vary sinusoidally in the circumferential direction and grow exponentially in time. This assumption in the themoelastic and heat conduction equations leads to a linear eigenvalue problem for the exponential growth rate for each wave number. The computational results are compared with an analytical solution for a layer sliding between two planes. The present method gives goods estimates for the critical rotational speed. Also. the effects of friction (pad) material properties on the critical characteristics are investigated.
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유한요소법을 이용한 디스크 브레이크의 과도기 열탄성 해석
최지훈(Ji-Hoon Choi),김도형(Do-Hyung Kim),이인(In Lee),차희범(Heebum cha),강민구(Mingu Kang) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.5
The transient thermoelastic analysis of automotive disk brakes with frictional contact is performed by using the finite element method. To analyze the thermoelastic behaviors occurring in disk brakes, the coupled heat conduction and elastic equations are solved. The fully implicit transient scheme is used to improve the computation accuracy at every time step. The numerical results of the thermoelastic behaviors are obtained during the repeated braking condition. The computational results show that the thermoelastic instability(TEI) phenomenon(the growth of non-uniformities in contact pressure) occurs in disk brakes. Also, the effect of material properties on the thermoelastic behaviors is investigated to facilitate the conceptual design of the brake system.<br/> <br/>
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