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Transient Operation of Electronics Equipment Subjected to Solar Loading
Keywords: outdoor electronics, transient analysis, spreadsheet modeling
Military test aircraft often use electronics located in pods that are attached to the aircraft in missile pod mounting points. The electronics in these systems are subjected to significantly varying thermal boundary conditions as the aircraft operates over a range of ambient temperatures, altitudes, flight speeds, and solar loading. This presentation will discuss an analysis that was conducted on a system slated for use in an electronics missile pod on military aircraft to identify a worst case system turn-on time, which was affected by the peak solar loading not coinciding with peak ambient temperature. A spreadsheet-based analysis was used to evaluate how solar loading, ambient temperature, and transient power dissipation combine to affect the module temperatures. The worst-case system start-up time was found to depend on factors such as total and individual module power dissipations, mass of the electronics pod and individual modules, and the color of the paint used on the pod. The presentation will describe the system in general terms, outline the procedures used in the spreadsheet to conduct a transient analysis of a nodal resistance network, and show results for a number of system configurations with power dissipations similar to the actual system that was analyzed.
Ross Wilcoxon,
Rockwell Collins

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