Vibration Testing to Mil-Spec

[ddelaiarro]

I've been trying to figure this out for a week or so and haven't come up with a confident answer, despite my research.

We're trying to come up with the proper profile for our vibration testing and seem to have run into a roadblock.

While I can't be that specific, we need to test 'installed' (not 'secured') equipment in a wheeled (not tracked vehicle). I've been pouring over MIL-STD-810F, Method 514.5 and, despite it's in-depth presentation, found this blurp in Annex A, paragraph 2.3.9a

Wheeled Vehicles:There is presently no analytical model of these environments for generalized application. The spectra of Annex C, figure 514.5C-1 through 514.5C-3 are typical of cargo bed responses in wheeled vehicles and trailers. This may be unrealistic for installed materials since it does not consider vehicle structural response beyond the heavily supported cargo bed. The large assembly cargo test of Annex A, paragraph 2.2.3 can be adapted to provide highly accurate test for this material.

Annex A, paragraph 2.2.3 does not direct you to any testing/profile information.

The initial part of Annex A, paragraph 2.3.9 also references ITOP1-2-601 for more information. I have pured over that as well and can only come up with test procedures for 'installed' equipment on 'tracked' vehicles and 'secured' equipment on both 'tracked' and 'wheeled' vehicles. There is no information for 'installed' equipment on 'wheeled' vehicles.

My question is: Has anybody come across this before? How did you handle it?

 

[CESSNA1]

DDELAIARRO: You may want to try the Institute of Environmental Sciences

Regards
Dave

 

[mechengdude]

From my experience, when they say unrealistic they mean its probably in excess of what your equipment will see in a wheeled vehicle.

My point: If you put equipment in a wheeled military vehicle and it passes the wheeled vehicle PSD curve then you are good to go. Lets not even get into the duration of the test yet.....

Another thing to consider: don't forget about crash loads...is the equipment going to be in an occupied space? Then you may need to do the 75g shock test.