Reciprocating
Machinery Vibration Short Course – Lecture Notes
K. E. Atkins, PCRC 9th Annual Gas Machinery Conference,
Denver, CO, September 26-29, 1994 .
In recent years, vibration instrumentation, transducers, data collectors,
etc. have experienced significant technological advances. Very powerful
vibration analysis tools are now compact and relatively inexpensive.
Sophisticated vibration trending software has also become readily
available to assist the machinery user in analyzing vibration data
and improving machinery reliability.
Most of the
hardware and software advances have been successfully applied
to turbo machines, i.e., centrifugal compressors, pumps, electric
motors, turbines, etc. Reciprocating machinery vibration is a
special case of machinery vibration. Reciprocating machines generate
far more complex vibration signatures than centrifugal machines
and are therefore more difficult to analyze and diagnose problems.
The purpose of this course is to provide some basic understanding
of reciprocating machinery vibration measurements and various
trouble-shooting techniques that can be used to identify and solve
vibration problems.
A significant
percentage of reciprocating machinery vibration problems are related
to pulsation induced forces. Understanding pulsation is important
for understanding reciprocating machinery vibration; however,
it is not covered in this course. Other PCRC publications are
available which cover pulsation analysis in detail.
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