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최지훈(Jihoon Choi),서영택(Youngtaek Seo),김래겸(Laekyeom Kim),김남규(Namkyu Kim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Recently, vehicles have been equipped with many electric equipment components according to safe, convenient, and environmental requirements. To meet the requirements, development of easy to control, durable, and miniaturized electrical components is essential. Therefore, the CVVD (Continuous Variable Valve Duration) actuator, which produces driving force in the new CVVD system under development, is applying the BLDC (Brushless Direct Current) motor. Requirements as automotive parts were analyzed and verified through numerical method and experiments to apply BLDC motors. For this purpose, the required torque, temperature conditions and vibration conditions of the product are clearly identified and reflected in the product design. In particular, it was developed with characteristics as smart actuators. As a result, basic performance such as response time was satisfied and achieved the required performance at last.
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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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