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| Title: Computer
aided optical design of reflectors in automotive headlights
Author(s): V Prasanna Kumar, R Lakkumanan, K Prakasan
Source: Proceedings of the I MECH E Part D Journal of Automobile
Engineering
Volume: 220 Page: 415-424. April 2006
DOI: 10.1243/09544070JAUTO86
Publisher: Professional Engineering Publishing
Abstract: This paper describes a constructive procedure
aimed at developing a CAD/CAE/CAM system for designing the reflector
of an automobile headlight for a given light intensity distribution
on the target (road), considering the styling of modern passenger
cars. A design concept is described in which the reflector alone
produces the specified illumination pattern. Consider a reflector
system consisting of a reflecting surface S, a point light source
O, and some object T (road). Assume that the source O, reflector
S, and object T are positioned so that the rays reflected off S
are incident on T. Depending on the geometry of S the energy radiated
by O and redirected by S is distributed on T to produce a certain
illumination pattern. A solution of the inverse problem consisting
of constructing the reflector S from constraints such as installation
space, depth, height, and width of a headlight pertaining to a particular
automotive body profile, the object T, and the specified illumination
pattern to be achieved on T is presented. This solution is integrated
with CATIA V5 for downstream functions such as manufacturing.
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| Title:
Headlamp modelling for simulating the capacity of automotive wiring
systems
Author(s): Hansang Lim1; Jaehong Park2
Source: Proceedings of the I MECH E Part D Journal of Automobile
Engineering
Volume: 217 Page: 1043 - 1047. Dec 2003
DOI: 10.1243/09544070360729383
Publisher: Professional Engineering Publishing
Abstract: This paper presents a headlamp model that can
be used as part of a computer simulation of a wiring system in a
vehicle. As more electrical equipment is installed in a vehicle,
the wiring system connecting such equipment becomes more complicated,
and thus it is essential to conduct a simulation of the wiring system
to confirm its capacity. To perform this simulation requires exact
models of the electrical equipment fitted to the vehicle. A headlamp
model is especially important since currents flowing in the lamp
vary dramatically. In this paper, a headlamp model is developed
on the basis of the first law of thermodynamics, which is also applicable
to a fog lamp. The headlamp is modelled as a variable resistor whose
resistance is determined by the change in the operating temperature
on account of the applied voltage. The resistance change was simulated
using the model, and the resistance of an actual headlamp in a car
was measured. Since the complete model is too complex, a simplified
simulation model, suitable for use in a computer simulation, is
also presented. Comparison of the two results showed good agreement,
and through this simulation the reliability of the presented model
was confirmed.
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