MFPT2019 has ended
Mobile App sponsored by Poseidon Systems, LLC
Back To Schedule
Wednesday, May 15 • 2:30pm - 3:00pm
Deliberations on Foundation Design Method for Rotating Machinery

Log in to save this to your schedule, view media, leave feedback and see who's attending!

Feedback form is now closed.
For on-shore applications, the support structure for a rotating machine normally consists of a block foundation. Adequate dynamic analysis of support structures for rotating equipment is necessary to ensure good conditions for the operation of the supported machine and safeguard other machinery near the subject rotating machine, as well.
The normally practiced method tries to achieve an under-tuned support structure which considers the machine mass and block foundation mass as one entity. Calculations consider that unbalance of the rotating machinery train generates a centrifugal force, which depends on the total mass of the set distributed in the two points of the axis, on the eccentricity between the centre of gravity of the rotor and the geometric axis of rotation, and on the angular velocity of the train. The design procedure assumes that the unbalance force is transmitted to the foundation. This paper endeavours to highlight that revised design procedures for support structures of rotating machinery should consider the stiffness ratio of the bearing support (casing) and the rotor - bearing system and restrict to assume that all vibrations are transferred to machinery foundation irrespective to the type of machine. Similarly, in the case of equipment with AMB (active magnetic bearings) very less vibration is transferred to the casing and after foundation as the magnetic flux helps rotor to levitate. This paper takes an approach of rotor dynamics to propose a revised thought process of structural support design.
The second objective of this paper is to propose the foundation be supported by low cost dampers at all sides of foundation block thereby minimising shear waves transmitted to the ground. This proposal should enable a smaller foundation size with less effort on site construction.



Manager Mechanical - Rotating Equipment, PETROFAC INTL. LTD

Wednesday May 15, 2019 2:30pm - 3:00pm EDT
Freedom Ballroom II