Unbalance Response Prediction for Rotors on Ball Bearings Using Speed- and Load-Dependent Nonlinear Bearing Stiffness
Rolling-element bearing forces vary nonlinearly with bearing deflection. Thus, an accurate rotordynamic analysis requires that bearing forces corresponding to the actual bearing deflection be utilized. For this work, bearing forces were calculated by COBRA-AHS, a recently developed rolling-element b...
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| Format: | Article |
| Language: | English |
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Wiley
2005-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/IJRM.2005.53 |
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| author | David P. Fleming J. V. Poplawski |
| author_facet | David P. Fleming J. V. Poplawski |
| author_sort | David P. Fleming |
| collection | DOAJ |
| description | Rolling-element bearing forces vary nonlinearly with
bearing deflection. Thus, an accurate rotordynamic analysis
requires that bearing forces corresponding to the actual bearing
deflection be utilized. For this work, bearing forces were
calculated by COBRA-AHS, a recently developed rolling-element
bearing analysis code. Bearing stiffness was found to be a strong
function of bearing deflection, with higher deflection producing
markedly higher stiffness. Curves fitted to the bearing data for a
range of speeds and loads were supplied to a flexible rotor
unbalance response analysis. The rotordynamic analysis showed that
vibration response varied nonlinearly with the amount of rotor
imbalance. Moreover, the increase in stiffness as critical speeds
were approached caused a large increase in rotor and bearing
vibration amplitude over part of the speed range compared to the
case of constant-stiffness bearings. Regions of bistable operation
were possible, in which the amplitude at a given speed was much
larger during rotor acceleration than during deceleration. A
moderate amount of damping will eliminate the bistable region, but
this damping is not inherent in ball bearings. |
| format | Article |
| id | doaj-art-14da8adc21da48159000f0e8c81a05f7 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2005-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-14da8adc21da48159000f0e8c81a05f72025-02-03T01:00:26ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342005-01-0120051535910.1155/IJRM.2005.53Unbalance Response Prediction for Rotors on Ball Bearings Using Speed- and Load-Dependent Nonlinear Bearing StiffnessDavid P. Fleming0J. V. Poplawski1NASA Glenn Research Center, Cleveland 44135, OH, USAJ. V. Poplawski and Associates, Bethlehem, 18018, PA, USARolling-element bearing forces vary nonlinearly with bearing deflection. Thus, an accurate rotordynamic analysis requires that bearing forces corresponding to the actual bearing deflection be utilized. For this work, bearing forces were calculated by COBRA-AHS, a recently developed rolling-element bearing analysis code. Bearing stiffness was found to be a strong function of bearing deflection, with higher deflection producing markedly higher stiffness. Curves fitted to the bearing data for a range of speeds and loads were supplied to a flexible rotor unbalance response analysis. The rotordynamic analysis showed that vibration response varied nonlinearly with the amount of rotor imbalance. Moreover, the increase in stiffness as critical speeds were approached caused a large increase in rotor and bearing vibration amplitude over part of the speed range compared to the case of constant-stiffness bearings. Regions of bistable operation were possible, in which the amplitude at a given speed was much larger during rotor acceleration than during deceleration. A moderate amount of damping will eliminate the bistable region, but this damping is not inherent in ball bearings.http://dx.doi.org/10.1155/IJRM.2005.53rotordynamicsrolling-element bearing stiffness dynamic analysisrolling-element bearingsbistable operation. |
| spellingShingle | David P. Fleming J. V. Poplawski Unbalance Response Prediction for Rotors on Ball Bearings Using Speed- and Load-Dependent Nonlinear Bearing Stiffness International Journal of Rotating Machinery rotordynamics rolling-element bearing stiffness dynamic analysis rolling-element bearings bistable operation. |
| title | Unbalance Response Prediction for Rotors on Ball Bearings
Using Speed- and Load-Dependent Nonlinear Bearing Stiffness |
| title_full | Unbalance Response Prediction for Rotors on Ball Bearings
Using Speed- and Load-Dependent Nonlinear Bearing Stiffness |
| title_fullStr | Unbalance Response Prediction for Rotors on Ball Bearings
Using Speed- and Load-Dependent Nonlinear Bearing Stiffness |
| title_full_unstemmed | Unbalance Response Prediction for Rotors on Ball Bearings
Using Speed- and Load-Dependent Nonlinear Bearing Stiffness |
| title_short | Unbalance Response Prediction for Rotors on Ball Bearings
Using Speed- and Load-Dependent Nonlinear Bearing Stiffness |
| title_sort | unbalance response prediction for rotors on ball bearings using speed and load dependent nonlinear bearing stiffness |
| topic | rotordynamics rolling-element bearing stiffness dynamic analysis rolling-element bearings bistable operation. |
| url | http://dx.doi.org/10.1155/IJRM.2005.53 |
| work_keys_str_mv | AT davidpfleming unbalanceresponsepredictionforrotorsonballbearingsusingspeedandloaddependentnonlinearbearingstiffness AT jvpoplawski unbalanceresponsepredictionforrotorsonballbearingsusingspeedandloaddependentnonlinearbearingstiffness |