Diagnosing
Machinery-Induced Vibrations of Structures & Foundations
F. R. Szenasi, Use of Vibration Measurements in Structural
Evaluation, ST Div/ASCE, Atlantic City Convention, April
29, 1987 .
When a structural
natural frequency coincides with an operating speed, high vibrations
of machinery, structures and foundations can occur and cause machinery
of structural damage. This paper presents field measurement techniques
to evaluate the effect of structural responses on machinery that
can be employed prior to machine startup. Vibration measurement
techniques are presented to aid in diagnosing structural problems.
The use of a mechanical shaker and modal analysis in evaluating
the structural response of several field structures is presented
along with the solutions to correct the vibration problems. Vibration
measurements (before and after modifications) are presented to show
the changes in natural frequency and reduction of vibrational response.
In one case, a mechanical shaker was used to define structural response
and sensitivity of a structure to unbalanced machinery. Another
case describes the successful modification of the foundation of
a 10,000 HP axial fan.
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