Hammer blow test from MIL-S-901
Hammer blow test from MIL-S-901
(OP)
Does anyone have correlations that give G-levels produced by the hammer blow test from MIL-S-901?
Bruce aka Tunalover
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Hammer blow test from MIL-S-901
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RE: Hammer blow test from MIL-S-901
There's a Navy report by Clements that shows some notional levels. I don't recall if I have a copy or not, but if I do it's at home. My recollection is that the levels are in the 100-300 g range, but there will be attenuation from the surrogate ship structure that you have to mount the UUT to.
TTFN
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RE: Hammer blow test from MIL-S-901
Oh, easier than I thought it was:
http:
Great! I can now get rid of my hardcopy
TTFN
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RE: Hammer blow test from MIL-S-901
http:
There's also a NAVSEA Carderock Powerpoint called Representative MIL-S-901D Floating Shock Platform Motions, but that's for the barge test...
Oh, actually, my recollection is that the Navy only accepts barge test quals, but it's been about 8 yrs since I've had anything to do with that.
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RE: Hammer blow test from MIL-S-901
They Navy does accept LWSM and MWSM testing, but it does depend on whether the item is a Princpal Unit or not.
RE: Hammer blow test from MIL-S-901
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RE: Hammer blow test from MIL-S-901
capnk: where in his report does he give those values? I've looked through the report and brought out of it a whole lot of theory and conjecture but no solid figures!
Thanks in advance.
Bruce aka Tunalover
RE: Hammer blow test from MIL-S-901
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RE: Hammer blow test from MIL-S-901
The MWSM is used for hull and deck mounted equipment, providing the deck mounted equipment is hard mounted or has isolation mounts with less than three inches of deflection.
The class of ship also determines the test type to a degree. For equipment on surface ships such as carriers, the frequencies of the decks are often fairly low. In these cases, the contract may require that the equipment be tested on a barge. The deck frequency may also be specified based on the particular equipment installation. Equipment that uses shock mounts that have a defelction capability greater than three inches must be tested on the barge.
As far as acceleration levels go, the peak values are the highest on the LWSM and are the lowest on the barge test with low frequency decks. The MWSM can produce an input on the order of 100Gs or more.
My advice would be to contact one of the test labs and ask them for actual data.