Sounds and vibrations can hurt but I suspect most of the damage they do is just like any other noxious stimuli and are not dependent on your affected limb being exposed to it. That is you might consider wearing ear plugs. They make different types and most can be modified to provide greater comfort or less sound blocking.

If you find the low frequency vibrations still disturb you then try having your foot up as much as possible where it's not so exposed.

Make sure the kid knows exactly the types of things disturb you if anything still does. People will learn to make allowances where they are possible.

Good luck.