| Abstract | Preceded by unbalance, misalignment is the second most common fault in
rotating machinery. The impact of misalignment fault on equipment can be severe and
may considerably shorten the machine’s lifetime. This dissertation discusses the
unbalance, parallel and angular misalignment forces on rotative machines’ vibration
spectra. Numerical simulation model development is used to obtain the time and
frequency responses of the rotor-coupling-bearing system. The parallel and angular
misalignment response are synchronized with the 1X amplitude of the unbalance
displacement. Moreover, the parallel misalignment fault magnifies the 2X amplitude
while the angular misalignment response is captured at 2X and 4X amplitudes of the
displacement response. Effects of changing the model’s rotational speed, misalignment
level, and coupling type are examined for both parallel and angular misalignments. |
