Mechanical Engineering & Design


Electrical cooling
Flow systems
Thermal Projects
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Compact video display cooling.
Thermal analysis and recommendations for cooling a miniature video display worn on the head. All cooling is by conduction, natural convection, and thermal radiation; no fan is required. The photograph shows a mechanic wearing the video display.  This product is the cover story of the April 8, 1999, Machine Design magazine.


Control cabinet cooling.
Analysis of the electrical enclosure cooling for a turbo-generator control system to be installed on U.S. Navy destroyers. This cabinet is unique because it can be disassembled and moved through small shipboard passages and then reassembled inside the ship. Douglas  provided the vibration and shock analysis,  the detailed mechanical design including sheet metal fabrication drawings, assembly drawings, and Bills of Material.

Power supply cooling.
Thermal analysis of electrical enclosures and heat sinks for portable and rack-mounted power supplies. Cooling analysis was provided for both conventional and switching power supplies. Douglas assisted with testing to determine electrical power dissipation.

Digital electronics cooling
Thermal analysis of consumer digital electronics.

Superconducting  wireless communications.
Design and engineering of a cryocooler for cooling superconducting thin-film electronic filters used in cellular and Personal Communication Service (PCS) wireless base stations. The equipment is mounted on cellular and PCS base station towers to increase receiver sensitivity and selectivity thereby allowing increased cell site coverage and improved call clarity. Responsibilities included thermal, structural, and fluid flow analysis and mechanical design using thermodynamic calculations performed by others. Two new  manufacturing processes were developed concurrently with the design thereby reducing total development cost and schedule. This orifice pulse tube cryocooler provides over 5 watts refrigeration at 80oK (-320oF) while rejecting heat to cooling air.  The photograph shows the engineering-test unit operating in ambient air covered with frost. 


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