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Dynamic Stability Analysis
The Project Manager rotor-bearing
system might or might not be suitable to withstand some excitation
sources, as blade-passing, oil whirl, misalignment, or first mode
excitation. In fact, some portions of the rotor can become more
excitables than others. Thus, the location (along the rotor) of the
excitation source can have an impact over the overall rotor
response.
In general, the stabilty concepts are difficult to handle. Every
researcher has his/her own approach. International standards do not
deal with methodology for stability analyses.
Here you can see
why this machine is suitable for running only up to 5000 rpm. Above
it, blade passign frequency becomes a problem.
Here you can see a comparison between various bearing options. 5
pad is the existing bearing. The choice between 4 pad and 6 pad
bearing to retrofit this machine with recurrent bearing failures
looks difficult. Would you install the 4 pad bearing design in this
machine ?.
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