Identification of Dynamic Coefficients and Stability Analysis of a Herringbone-Grooved Journal Bearing
博士 === 國立臺灣大學 === 機械工程學研究所 === 99 === The purpose of this study is to build up an instrument that can experimentally investigate the static characteristics and dynamic coefficients by using the incremental static load method and unbalance-excitation method on stability analysis of an impeller-spind...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/74935785539469417461 |
| Summary: | 博士 === 國立臺灣大學 === 機械工程學研究所 === 99 === The purpose of this study is to build up an instrument that can experimentally investigate the static characteristics and dynamic coefficients by using the incremental static load method and unbalance-excitation method on stability analysis of an impeller-spindle with herringbone-grooved journal bearing (HGJB) for the experimental device operated at Sommerfeld Number from 14 to 106. In addition, the relation between the dynamic stability and shock resistance were obtained by measuring the dynamic behaviors of spindle trajectory. Results show that the dimensionless threshold speed of rotation decreased as the Sommerfeld Number increased and the proposed impeller-spindle is unstable when the Sommerfeld Number is greater than 49 to 106, indicating that the spindle should not operate at the condition with an eccentricity ratio below 0.18. The spindle can’t sustain the shock excitation when it is operated in this unstable region according to measurements of dynamic trajectories of journal.
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