| POSITIONING CRITERIA FOR AUTOMOTIVE HEADLAMP MODULE
SUPPORTS USING TRANSMITTED FORCE AND NATURAL
FREQUENCY |
| Dongwoo Hong1, Jongmyeong Park2, Byeongil Kim1 |
1Yeungnam University
2SL Corporation |
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| ABSTRACT |
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Headlamps are one of the most important parts of vehicles because they contribute to the vision and safety of
the driver. However, rough road conditions create harsh external excitations, which could loosen bolts in the headlamp
assembly and cause improper aiming of headlight. Additionally, headlamps must be robustly designed because supporting
positions of their assembly are typically determined based on the initial design of vehicle chassis without considering the
occurrence of vibration fatigue. Therefore, under driving conditions, the headlamp assembly may experience excessive
excitation forces, which loosen supporting bolts and arbitrarily change the aiming and adjustment of the headlight. To solve
these issues, in this study, the authors propose positioning criteria for the headlamp bolts by predicting the transmitted force
and natural frequency when external excitation forces are applied. First, the equations of motion for a conventional headlamp
model are derived via lumped parameter modeling. Next, the transmitted force at each supporting point and natural frequency
are calculated and utilized in the positioning criteria. Then, several cases are validated using experimental and computer aided
engineering (CAE) results. Finally, positioning criteria for the headlamp bolts are suggested by combining the transmitted
force and natural frequency. |
| Key Words:
Positioning criteria, Headlamp module, Transmitted force, Natural frequency |
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Corresponding Author.
Byeongil Kim , Email. 
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