Abstract
The use of Light-emitting diodes (LEDs) in automobile headlamps began two decades ago. Since then, several design and efficiency improvements have been made. However, the reliability and durability of these LED systems remain uncertain. There are several approaches for reliability analysis, e.g., thermal, electrical, optical, or structural. The first three issues have been studied in the past, but there has been minimal focus on structural and dynamic durability. Uneven road conditions and impact forces acting on the headlamp module can damage components and misalign the aiming mechanism. Moreover, the functionality could be disturbed, thereby decreasing the efficiency of the system. To determine the forces acting inside the module on each component, this study proposes a simulation technique for predicting the magnitude of forces transmitted from the automobile chassis to the headlamp module under even and uneven road conditions. A vibration system with 23 degrees-of-freedom is developed and equations of motion are derived using Newton’s second law of motion. Solving this system of equations with Simulink and MATLAB provided the linear and angular displacements of each element, which were then utilized to calculate the forces transmitted through these elements. Two forcing conditions were compared and the locations with maximum forces are highlighted.
Highlights
The widespread manufacturing of automotive lighting systems using Light-emitting diodes (LEDs) technology has yielded products that are energy efficient, durable, environment-friendly, and with long service life
The above results show a significant increase in the force transmitted in case II, except for the projection unit in the y-axis direction
The maximum force was transmitted through the bracket unit in the x-axis direction
Summary
The widespread manufacturing of automotive lighting systems using LED technology has yielded products that are energy efficient, durable, environment-friendly, and with long service life. Driver’s eye wants to see the cut-off line of the headlamps to obtain further visibility of night road. The major advantages of LED lamps over incandescent lamps are higher mean time between failure, high service life and the brightness (up to 15,000 mcd and above). An LED system comprises a large number of small and important equipment that must be carefully studied and manufactured with the best design configurations. A vibration analysis was conducted on the MCM 300 headlamps to
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