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Re: Crane Design

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> I beleieve the crane can be assumed to be a lumped mass.
I wouldn't bet the store on that. Most of the bridge crane structures 
I've worked on, big and small, have 3 or 4 natural frequencies below 10 
Hz. The load on the hook also swings which adds to lateral loading.  

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)