I don't think you could go wrong just packing fiberglass batt insulation into your floor joist space. However some sound/vibration will still travel through the joist itself.
I even expected sound to be deadened some more after I'd put in cabinets, etc. But for all the effort, I'd say that the sound reduction was noticeable--but not by much.
As hoganem says, some sound just travels through the framing. You sometimes hear that common walls between condos (and the like) may be built with an airspace to lessen noise.
In our case, I'd say our efforts weren't worth the trouble. But I wonder if you might be able to build up some kind of subfloor under the appliances? Raise them up a few inches?
I think there are also metal pans you can put under the washer, in case (somewhere down the road) a leak develops. Might be worth a look while you're at it.
-k2 in CO
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