Insulating a Random Vibe Table during thermal test 1

[JoeTest]

I'm planning on buying an OVTT Random Vibration table to do just a little HALT testing of a structure made of composites and containing PCBAs. That will be followed by ongoing HASS screening over a temperature range with vibe.

The DUT only weighs a few pounds but the shaker weighs 140. I want to minimize the thermal load from the Vib table. My basic strategy is to elevate the DUT a few inches with a fixture and then bury the Vib table in fiberglass insulation. I'm new to vibe testing so I'd like to know if there are any downsides to that approach or any better approaches.

Thanks in advance!

 

[btrueblood]

Slip table or vertical shaker head?

Glass wool or fiber or cellular foam insulation - it's all brittle stuff and you can count on it breaking down sitting on a shaker head for even a few minutes. Lots of little fiber particles or other debris - basically silica sand - falling onto whatever is below.

In a typical direct vertical shaker head, probably no big deal, vacuum up the dust at the end of the day.

On an oil-bath slip table, you'd better invest in some really good filters. And still count on seeing some wear/breakdown of slip table surfaces, pumps, valves...

I'd suggest using a polymer foam insulation instead, if only because it is less likely to cause trouble or present a dust inhalation hazard.

 

[BrianE22]

Would silicone rubber sheets work?