Various events in reciprocating machinery, such as connecting rod or piston movement, and diesel combustion produce a
series of highly transient forces within the machine. These events generate force transients of short duration and broad
frequency content. Even though these events may be part of a machine cycle and therefore periodic, it is often more
appropriate to treat them on an individual basis because more diagnostics information is available from a single
waveform during a cycle than from averages over several cycles. However, it is very rare for one to have direct access
to source waveforms because of the expense and reliability problems associated with the required instrumentation, and
non-invasive techniques will have to be used. This paper explores the use of cepstral smoothing and minimum phase
extraction technique for non-invasive diagnostics of bearing impacts in reciprocating machinery. The methodology is
based on extracting diagnostic signals from vibration measurements taken at a "convenient" location such as the
crankshaft casing or bearing end-cap, and consists of source identification, diagnostic signature recovery, and diagnostic
system decision-making. A dynamic simulation with lumped mass model is developed to analyze bearing impacts for
the big end bearings, experimental measurements from accelerometers, transfer functions of vibration, and the structural
response are presented.
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