machine vibrations

huangyhg

machine vibrations
i need to design piers to support a pump for a water treatment plant but i am unfamiliar with a proper way to quantify the vibrations that may be caused by the pump.  is there a proper way to equate the vibration into a lateral force?  where can i find information on machine vibration and how to deal with it?
thanks in advance
danny_m (visitor)8 apr 02 12:19
generally, the manufacturer will give you the equivalent static load for the pump. usually, however, this load is small enough to be insignificant.
whenever a rotational harmonic load is present, the main concern is the dynamic response of the foundation. the mauufacturer will give you a force applied at a given rpm. analyze your pier foundation system dynamically and determine the velocity (or displacement or acceleration) at the rotating equipment bearing. if the velocity is less than the manufacturer's allowable, the design is ok
it will also depend on the kind of pump you propose to use. a rotary/ centrifugal pump will give a small load as compared to reciprocating pumps which tend to produce shock loads of higher values.
you can refer to the machine foundations book by barkan.
preynolds,
as a rule of the thump, for relatively small vibrations, if the weight of the equipment pad is larger than the 1.5 to 2.0 times the weight of the equipment, the vibrations transmitted to the foundation will be within the acceptable.   
if the equipment produces large vibrations, it should be mounted in shock absorbers.    in this case the shock absorbers and the foundation should be designed accordingly to the manufacturer's recommendations.