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Förslaget inkom 2011-10-28

Heat conductance in joints of electronic equipment

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
Background

One of RUAG Space main products is electronic equipment for space applications. The electronic components are typically mounted on boards that are screwed into a chassis of aluminium. Thermal analysis is performed on the equipment with the aim to show that the component temperatures, are below allowed limits. To be able to predict the temperatures the thermal contact conductance’s in screw joints need to be known. It is difficult to generally predict the thermal resistances in screw joints which are dependent on lot of parameters related to the actual configuration as e.g. the manufacturing process and way of mounting. This work aims to increase the confidence in performing thermal analysis on specific RUAG Space products with respect to screw joints.

Scope
The master of thesis work focuses on measurements of the heat resistances between joint parts in electronic equipment, mainly screw joints. The measurement shall be performed in vacuum. Comparison with theoretical values shall be performed.

The work is expected to take 20 weeks and consists of:

•General literature study of methods for theoretical calculation and measurement of thermal contact conduction between two parts that are joined together by screws.

•Calculation of thermal contact conductance’s applicable for RUAG Space AB equipments using calculation methods from the literature study in order to select important parameters for test definition.

•Determination of test method and test configuration that represents typical joints. The measurement should be performed in vacuum and also, for comparison, at normal atmospheric pressure.

•Before the test an error analysis shall be performed in order to evaluate if the test is sufficiently accurate.

•Test preparation and conduction.

•Comparison between measured contact conductance with calculated values

•Documentation and presentation.

Contact persons at RUAG Space
Karin Woxlin tel.: +46 31 735 4033 e-mail: karin.woxlin@ruag.com

Send application to: hr.se.space@ruag.com



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