Infant shaking a crib
Infant shaking a crib
(OP)
I'm a test engineer and am seeking advice on how effectively an infant could shake a crib to failure. Shaking loosens hardware like screws (over time) while impact can cause outright failure. It is known (and quite intuitive) that infants don't have alot of strength. Still, hardware loosens on cribs but correlation to shaking is anecdotal. The most damaging way to shake a structure (crib) is at forced resonance wherein a small force quickly results in large motions --- motions equal potention for joints to loosen even before outright failure. I know resonance is learned for walking and for swinging, but at a more advanced age. Infants like movement, so maybe they would be inspired to get the most movement out of their crib?
My question is this: For infants, either on all-fours or upright holding onto a crib rail, what is the approximate age at which they can move in resonance with a crib? Is there a source for information on this topic?
My question is this: For infants, either on all-fours or upright holding onto a crib rail, what is the approximate age at which they can move in resonance with a crib? Is there a source for information on this topic?





RE: Infant shaking a crib
Nonetheless, you should be a ble to swag numbers for infant weight an height from growth tables and swag some numbers for frequencies. Borrow your friends' baby videos and see what they do.
TTFN
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RE: Infant shaking a crib
I like your idea to review videos of kids in cribs.
Thank you.
RE: Infant shaking a crib
Aaron A. Spearin
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Engineering Six-S'$
www.Engineering6ss.com
"The only constant in life is change." -Bruce Lee
RE: Infant shaking a crib
Wood shrinkage can cause loosening as the moisture in the crib drops, especially during winter.
RE: Infant shaking a crib
TTFN
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RE: Infant shaking a crib
RE: Infant shaking a crib
TTFN
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RE: Infant shaking a crib
I'm guessing their are no human factors types that can point me to a study of baby kinesthesis for perception of resonance. I can still find videos of kids and view the frequency of rocking and estimate whether resonance was achieved.
Thank you all for your interest.
RE: Infant shaking a crib
RE: Infant shaking a crib
The next step may be a reality check. What is the resonant frequency (or frequencies)of a crib?
The answer may be out of the range of frequencies that an infant may reasonably be expected to generate.
True, but after a few kids and the experience of trying to remove something from an infants grasp, my "intuitive assessment" of the strength of an infant was revised upwards by almost an order of magnitude.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Infant shaking a crib
Waross:"The answer may be out of the range of frequencies that an infant may reasonably be expected to generate".
True. And I can measure it. But who will tell me what frequencies are within range?