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Re: Dynamic design of machine foundation

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Amen.

Rajendran
--- THunt(--nospam--at)absconsulting.com wrote:

> Richard,
> 
> The best guide book for rotating equipment at grade
> is "Design of 
> Structures and Foundations for Vibrating Machines",
> by Arya/O'Neill/Pincus 
> however it is out of print and hard to find.  It is
> a very tedious 
> procedure with lots of small numbers but in essence
> you develop springs 
> and damping ratios for six degrees of freedom then
> calculate the 
> deflection from the out-of-balance forces generated
> by the rotor shaft. 
> This is an ideal situation for a program or spread
> sheet but if you are 
> doing this for the first time note you will spend a
> lot of time debugging 
> and trying to get it right.
> 
> Thomas Hunt, S.E.
> ABS Consulting
> 
> 
> 
> 
> "Rich Lewis" <sea(--nospam--at)lewisengineering.com> 
> 12/13/2004 12:49 PM
> Please respond to
> <seaint(--nospam--at)seaint.org>
> 
> 
> To
> <seaint(--nospam--at)seaint.org>
> cc
> 
> Subject
> Dynamic design of machine foundation
> 
> 
> 
> 
> 
> 
> I am designing a foundation for a 130,000 lb
> compressor with dynamic
> loads.  The foot print of the equipment is over a
> 30X40 ft. area.  It
> will have a separate mat foundation below it.
> 
> I have done some research and it appears to me a
> dynamic load such as
> this requires a special analysis to calculate the
> deflections based on
> the dynamics.  I found several references on this,
> one in particular by
> Bowles in the 5th ed., chapter 20.  He has a program
> to calculate the
> vertical, horizontal and rocking deflections due to
> the machine
> dynamics.  Is the method he describes in his book
> what is commonly used
> in practice today?  Is there an easier way to do
> this?
> 
> Bowles method requires the dynamic shear modulus. 
> Are there some tables
> with typical values for clay soil other than what he
> has in his text?
> Bowles uses primarily metric in this chapter and
> doesn't have an
> equation for English dynamic modulus.
> 
> I would appreciate any suggestion I can get for
> foundation design of
> dynamic equipment loads.
> 
> -------------
> Richard Lewis
> Lewis Engineering
> rlewis(--nospam--at)lewisengineering.com
>  
> 
> 
> 
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