Abstract
Misalignment of multi-bearing rotor systems is one of the most common fault conditions
yet it is still not fully understood. There are numerous (and sometimes confusing) accounts in the
literature asserting the presence of harmonics in the vibration signal, but no quantitative
descriptions are offered. Harmonics may arise, of course, from the nonlinearities in fluid film
journal bearings or from the kinematics of flexible couplings, but in this paper only rigidly coupled
rotors mounted on idealised linear bearings. It is shown that even for this case, excitation at twice
synchronous speed is developed and an expression for the magnitude and phase of the response is
derived. Several examples are then studied to give some insight into the magnitude of these
harmonic terms which can arise. It is argued that it is precisely because the harmonic terms can
arise from diverse sources, a full description of the phenomena has proved somewhat elusive.
A brief discussion of the type of rig required to validate the model is given. There is a need to
separate the phenomena discussed here from the nonlinearities found in real machines. Some
features of the new facility are described.
Publisher
Trans Tech Publications, Ltd.
Cited by
1 articles.
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