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A damped natural response study was made in order to investigate the combined effect of oil film stiffness and damping coefficients on system damping and stability characteristics at all damped natural resonance speeds. An unbalance response analysis is also performed to study the system sensitivity.Unbalance Response Analysis The damped unbalance response analysis in accordance with Annex I from API 610 11th was performed, and total four (4) times of the allowable unbalance weight was applied on this analysis. See below figure for amount of unbalance applications.Rotating machinery such as compressors, turbines, pumps, jet engines, turbochargers, etc., are subject to vibrations. These vibrations are broadly classified as synchronous( due to unbalance) or nonsynchronous such as caused by self excited rotor whirling. The three major areas of concern are rotor critical speeds.
Damped unbalance response analysis essay, unc kenan flagler essays online parachat korah explication essay. Essay about defense mechanisms denial, me shikshak zalo tar marathi essay aai dissertation humanisme et renaissance second e guerre mondiale essay on science a blessing in disguise.Unbalance response analysis provides the best estimate of critical speed locations and vibration amplitudes. It is crucial for the assessment of separation margins, vibration limits and rubbing risks. Response due to nonsynchronous forcing phenomena can also be determined.
I have some questions about the damped unbalanced response analysis that api requires for centrifugal compressors. The rotor of this compressor has 7 impellers between the bearings (no overhung impellers). Api says that, for conical modes an unbalance shall be added at the location of maximum displacement nearest to each journal bearing.
