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자동차용 알루미늄 합금 휠의 진동특성에 관한 실험적 연구
김병삼(Byoung-Sam Kim),김기전(Gi-jeon Kim),이태근(Tae-Keun Lee),이규철(Gyu-Cheol Lee) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
The styling of automobile wheels and their effect on vehicle appearance has increased in importance in recent years. The wheel designer has been given the task of insuring that a wheel design meets its engineering objectives without affecting the styling theme. The wheel and tire system is considered as a vehicle component whose dynamic modal information of the tire/wheel system are employed in the modal synthesis model of the vehicle. The Vibration characteristics of a passenger car wheel play an important role to judge a ride comfortability and quality for a passenger car. In this paper, the vibration characteristics of a AI-alloy and steel wheel for passenger car are studied. Natural frequency, damping and mode shape are determined experimentally by frequency response function method. Results show that wheel material property, size and design are parameter for shift of natural frequency and damping.<br/>
이태근(Tae-Keun Lee),김기전(Gi-Jeon Kim),김병삼(Byoung-Sam Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
At the past year, the study for the importance of road surface on pass by noise have been carried out. In this study, the effects of test road are studied for pass by noise. Test roads are selected the domestic test place and europe test place which are ISO road surface. Test tire having the europe type pattern is used in pass by noise measurement. Pass by noise is measured by 2001/43/EC test method. From the test data, the differences among road surface is investigated. Analyzing the differences, the predicted pass by noise is induced and the error is less than IdB(A).
전도형(Do-Hyung Jeon),최주형(Joo-Hyung Choi),조진래(Jin-Rae Cho),김기전(Gi-Jeon Kim),우종식(Jong-Shik Woo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This study is concerned with the braking distance estimation using frictional energy rate. First, steady state rolling analysis is performed, and using this result, the braking distance is estimated. Dynamic rolling analysis during entire braking time period is impratical, so that this study divides the vehicle velocity by 10㎞/h to reduce the analysis time. The multiplication of the slip rate and the shear stress provides the frictional energy rate. Using frictional energy rate, total braking distance is estimated. In addition. ABS(Anti-lock Brake System) is considered, and two type of slip ratios are compared. One is 15% slip ratio for the ABS condition. and the other is 100% slip ratio which leads to the almost same braking distance as the elementary kinematic theory. A slip ratio is controlled by angular velocity in ABAQUS/Explicit. A 15% slip ratio gives the real vehicle's braking distance when the frictional energy occurred at disk pad is included. Disk pad's frictional energy rate is calculated by the theoretical approach,
타이어 롤링해석을 활용한 타이어마모량 예측에 관한 연구
최주형(Joo-Hyoung Choi),조진래(Jin-Rae Cho),김기전(Gi-Jeon Kim),우종식(Jong-Shik Woo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Tire wear of automobile is considered as an important factor to decrease the breaking and cornering performance. However, the tire rubber materials have been developed on an empirical basis up to the present time. Furthermore, one of the most expensive tests is the highway abrasion test. In this aspect, the numerical simulation approach is currently being widely employed. In this paper, we investigated the factors affecting the tire wear based on the mechanism of abrasive wear, and we found that the tire wear is closely related to frictional energy. Accordingly, the frictional energy is computed by utilizing the 3D dynamic rolling analysis of patterned tire. Finally, the amount of tire wear is predicted by correlating frictional energy with the wear equation.
이승호(Seung-Ho Lee),심동석(Dong-Suk Shim),김기전(Gi-Jeon Kim) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.5
The requirements of getting spring steel with higher fatigue strength have been increased to achieve the weight reduction of a vehicle. As the possible increment in fatigue strength by using the conventional shot peening treatment is found to be limited, it is necessary to modify the shot peening treatment. In this study, to investigate the effects of warm shot peening on increasing fatigue strength, tests are conducted on spring steel SAE9524. By the results of rotating bending fatigue tests, the fatigue strength increases up to 23.8% in warm shot peening specimens at 200℃ compared with conventional shot peening. The major reason why the warm shot peening is effective to the improvement of fatigue strength is the increment of the compressive residual stress, which can be effectively formed by shot peening under the condition of warm temperature than room temperature.