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Construction of a transient model for a Class 8 tractor-trailer negotiating mountain terrain is presented. Four basic brake models for free and forced cooling (GSRS, UMTRI, Limpert, and HVE Brake Designer®) are converted to consistent units. The units have been reduced to those accepted variables in the thermodynamic/heat transfer literature (hc, A, cp, M), thereby facilitating model comparison and coefficient selection from the published literature. The data has been compared to real test published data. The effect of varying the desired vehicle speed, vehicle weight, number of adjusted brakes, and slope magnitude on brake drum temperatures is explored.

The purpose of this paper is to present an updated methodology for validating the visibility of objects in low-illumination digital photographs. A procedure is presented for creating prints from digital images that accurately represent the observers' view at a low-illumination scene. In addition, procedures are presented that allow representative displays of digital images on CRT and projector devices. The results indicate that the selected luminance settings of experimenters closely matched the selections of test subjects viewing similar images in print form and on CRT and projector displays. Further, both between-subject and between-experimenter variability was small.