A thermomechanical analysis based on a contact temperature measurement

Abstract

Modern headlamps are made from thermoplasts, which are very convenient materials for headlamp design. However, the poor thermomechanical properties of polymers can cause deformations, problems with the photometric properties, and sealing difficulties. In order to predict these deformations, standard methods were used and combined in a new approach for a quick and efficient evaluation of such headlamps. Thin-film resistance temperature detectors were employed at significant points on the headlamp housing to measure the temperature. The results were then used to determine a three-dimensional temperature field for the headlamp housing. This temperature field was subsequently used in a finite element method analysis to determine the deformations in the housing of the headlamp.

Keywords

thermomechanical analysis headlamps contact temperature measurement

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References

Shiozawa

Yoneyama

Sakakibara

Goto

Tsuda

Saga

Kobayashi

‘Thermal air flow analysis of an automotive headlamp: The PIV measurement and CFD calculation for a mass production model.’

JSAE Rev. 22 (2001): 245–252

Sousa

J. M. M.

Vogado

Costa

Besler

Freek

Heath

‘An experimental investigation of fluid flow and wall temperature distributions in an automotive headlight.’

Int. J. Heat Fluid Flow 26 (2005): 709–721

Moore

W. I.

Donovan

E. S.

Powers

C. R.

‘Thermal analysis of automotive lamps using the ADINA-F coupled specular radiation and natural convection model.’

Computers Structs 72 (1999): 17–30

Sun

Y. S.

Emery

A. F.

‘Effects of wall conduction, internal heat sources and internal baffle on natural convection heat transfer in rectangular enclosure.’

Int. J. Heat Mass Transfer 40 (4) (1997): 915–929

Bejan

Convection heat transfer (New York: John Wiley 1995)

Wagner

Bajsić

Fajdiga

‘Measurement of the surface-temperature field in a fog headlamp using resistance-based temperature detectors.’

Strojniški Vest. 50 (2) (2004): 72–79

Okada

Nouzawa

Nakamura

‘CFD analysis of the flow in an automotive head lamp.’

JSAE Rev. 23 (2002): 95–100

Wagner

Improvement of development methods with RMS procedure MSc Thesis, University of Ljubljana, Ljubljana, Solvenia, 2003

Holman

J. P.

Gajda

W. J.

Experimental methods for engineers, 6th edition ((McGraw-Hill, New York: 1994) ch. 8

10.

11.

Heraeus, Platin-Temperatursensor in Dünnschichttechnik, 2008, accessed 11 February 2008 available from http://www.heraeus-sensor-technology.de/downloads/datenblaetter/M_422_d.pdf.

12.

Industrielle Platin-Widerstand- thermometer and Platin-Meßwiderstände (IEC 60751:1983 + AMD 1:1986 + AMD 2:1995); Deutsche Fassung EN 60751:1995 + AZ:1995 (Berlin: Deutsches Institut für Normung 1996)

13.

Guide to the expression of uncertainty in the measurement (GUM) (Geneva: International Standardization Organization 1995)

14.

Wagner

Bučar

Fajdiga

‘Effects of different analysis parameters on calculation of the temperature loaded headlamp.’

Strojniški Vest. 52 (1) (2006): 52–62

15.

Wagner

Bučar

Fajdiga

‘Stress—strain state as a consequence of temperature loads in a headlamp housing.’ In Proceedings of the 7th Conference on

Innovative automotive technology (IAT 05), Bled, Slovenia (IAT 05), 21–22 April 2005, vol. 1, pp. 525–535 (University of Ljubljana, Ljubljana).