Identifying and Minimising Uncertainty for Experimental Journal Bearing Studies
Over the last few decades, different experimental methods, with varying forms of data analysis, have been employed on a wide range of journal bearing types. Under these circumstances, it is not surprising that the results presented, and their accuracy, are subject to varying scatter. Many of the ass...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2005-01-01
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| Series: | International Journal of Rotating Machinery |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/IJRM.2005.221 |
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| Summary: | Over the last few decades, different experimental
methods, with varying forms of data analysis, have been employed
on a wide range of journal bearing types. Under these
circumstances, it is not surprising that the results presented,
and their accuracy, are subject to varying scatter. Many of the
assessments have been rather imprecise, often using unquantified
statements such as “generally good agreement with predictions.”
Most authors seem to have accepted that the appreciable scatter of
results, especially in the dynamic oil film coefficients, was
inevitable. Uncertainty is defined as the estimate of the errors.
Note that the estimate may often be too optimistic
because some sources of error have not been identified. This paper
highlights sources of error for experimental journal studies,
including some associated with the measurement system and physical
misalignment. It is intended that this paper presents a coherent
source of information on best practice in the field of
experimental bearing research, offering a clearly prescribed
methodology to estimate uncertainty and reduce error. The results
of calculations of the sensitivity of the dynamic
bearing coefficients to experimental errors in some commonly used
rig configurations are presented. It is shown that one of the
excitation schemes gives significantly lower sensitivity, but even
this scheme has quite high sensitivity to measurement errors,
especially phase. In conclusion, some of the critical precautions
in the search for good quality results for experimental journal
bearing studies are described. |
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| ISSN: | 1023-621X 1542-3034 |