Spring impact
Spring impact
(OP)
I'm designing a spring as a fall arrest but my mechanical design side is rusty. Mainly work on pumps and piping
Spring is attached to a beam above the person. Person slips and falls off a ledge 3m (static elongation due to mass applied statically?).
I apply the Fe = W (1 + t ( 1 + 2h/static deflection))
My question is, is this correct?
Does this include the weight force OR must the weight force then be added to Fe. ie. F = Fe + Fw
Also, what force does the lug that the spring at the top see. Is it just the weight force and the spring extension 'removes' the Potential/kinetic energy. OR does the support see both the Impact force, Fe and weight force Fw.
If someone could point me to a book with an example or anywhere that would help. Thanks in advance.
Spring is attached to a beam above the person. Person slips and falls off a ledge 3m (static elongation due to mass applied statically?).
I apply the Fe = W (1 + t ( 1 + 2h/static deflection))
My question is, is this correct?
Does this include the weight force OR must the weight force then be added to Fe. ie. F = Fe + Fw
Also, what force does the lug that the spring at the top see. Is it just the weight force and the spring extension 'removes' the Potential/kinetic energy. OR does the support see both the Impact force, Fe and weight force Fw.
If someone could point me to a book with an example or anywhere that would help. Thanks in advance.





RE: Spring impact
Do you really want to put yourself in the position of telling your boss, "Well some guys on the internet said it should work."?
RE: Spring impact
Bad idea.
RE: Spring impact
If you use a spring as a fall arrest ask yourself this question:
When the spring exerts sufficient force to arrest someone's fall what then happens to the energy stored in the spring.
RE: Spring impact
of course i know to control the absorbed energy ... there's a pawl and ratchet, so the entended spring won't spring back ...
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