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[論文] 일괄 풀림처리된 강판의 예비 변형정도에 따른 소열경화 특성
허훈(Hoon Huh),황필상(P. S. Whang) 한국자동차공학회 1990 오토저널 Vol.12 No.1
Bake hardenability of batch annealed steel sheets is investigated in connection with the amount of tensile deformation and the bake hardening condition. This study associates with the method for producing bake hardening materials by means of batch annealing process and for measuring bake hardenability which is not yet fully established. The experimental result demonstrates the relationship between strain distribution and bake hardening behavior in various bake hardening conditions, which provides an essential information for automobile design and related sheet metal forming in a press shop. The result also shows the bake hardenability ofthe tested material increases as the baking temperature is increased froni 150 ℃. The result assures the bake hardening materials can guarantee reasonably high strength as well as good uniformity in yield strength for the automobile body by sheet metal forming process.
차량 주행시 조향에 따른 리플 및 진동 특성에 대한 연구
장석환(Seokhwan Jang),황필상(Pilsang Hwang) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Steering is a kind of drivings starting point. This is very important for vehicles behavior. At this time several difference steering feel is also influenced to driver for comfort steering. For example, in parking and signal waiting and so on. In these static case, low speed steering is caused to low frequency vibration and ripple and fast speed steering is reasoned to low frequency vibration and noise. And these root case is studied and improved for a long time. But dynamic case, compare with static case, it is very easy to get disturbance. At this time, steering torque is different frequency and magnitude with static case. Therefore static case filtering method is difficult to improve dynamic case ripple and vibration. So in this paper, from EPS to vehicle body, studied dynamic drivings special noise characteristics and method to optimize them.