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Unformatted text preview: al No resonance should occur, hence the natural frequency
of foundation-soil system should be either too large or
too small compared to the operating frequency of the
machine. GENERAL REQUIREMENTS
OF MACHINE FOUNDATIONS
The amplitudes under service conditions should
be within the permissible limits.
be All rotating and reciprocating parts of a machine
should be so well balanced as to minimize the
unbalanced forces or moments.
unbalanced Where possible, the foundation should be
planned in such as manner as to permit a
subsequent alteration of natural frequency by
changing base area or mass of the foundation
as may subsequently be found necessary.
as Practical point of view
The ground-water table should be as low
as possible and ground-water level deeper
by at least one-fourth of the width of
foundation below the base plane.
foundation Machine foundations should be separated
from adjacent building components by
means of expansion joints.
means Any steam...
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- Summer '12