Shop Acceptance Testing Of Compressor Rotordynamic Stability And Theoretical Correlation

This paper presents the rotordynamic stability testing of a nine-stage centrifugal compressor used for hydrogen recycle service. The machine tested was of a basic design and employed no damper bearings, damper seals, shunts or swirl brakes to generate very high logarithmic (log) decrements as in previous papers. The test was performed using an electromagnetic shaker as part of the shop order. Results include the forward and backward mode’s stability and frequencies. Two log decrement estimation techniques were employed: One based in the time domain that does not require measurement of the shaker force and the classic ones based in the frequency domain. Examination of the results benchmarks the original equipment manufacturer’s (OEM’s) stability analysis methods versus the measurements. It also provides benchmarking of the purchaser’s acceptance criteria, which can be tailored to each specific OEM.

[1]  K. Kwanka.  Stability Behavior of a Three Journal Bearing Rotor System Excited by a Lateral Force , 1990 .

[2]  Brian Pettinato,et al.  Rotordynamic Tests Of A Flexible Rotor On Flexure Pivot Journal Bearings And Stability Correlation With Frequency Dependent Characteristics. , 2002 .

[3]  J. Jeffrey Moore,et al.  Rotordynamic Stability Measurement During Full-Load, Full-Pressure Testing Of A 6000 Psi Reinjection Centrifugal Compressor. , 2002 .

[4]  Akio Hizume,et al.  5) Solving Nonsynchronous Vibration Problems of Large Rotating Machineries by Exciting Test in Actual Operating Condition , 1988 .

[5]  David J. Ewins,et al.  Modal Testing: Theory, Practice, And Application , 2000 .

[6]  David Robertson D.Sc. M.I.E.E..  LXII. Transient whirling of a rotor , 1935 .

[7]  Lennart Ljung,et al.  System identification toolbox for use with MATLAB , 1988 .

[8]  James M. Sorokes,et al.  Full-Scale Aerodynamic And Rotordynamic Testing For Large Centrifugal Compressors. , 2009 .

[9]  Yves Bidaut,et al.  Rotordynamic Stability Of A 9500 Psi Reinjection Centrifugal Compressor Equipped With A Hole Pattern Seal-Measurement Versus Prediction Taking Into Account The Operational Boundary Conditions. , 2009 .

[10]  Pranabesh De Choudhury.  Rotordynamic Stability Case Studies , 2004 .

[11]  Donald E. Bently,et al.  Stability Evaluation of Rotor/Bearing System by Perturbation Tests, , 1982 .

[12]  Charles Jackson,et al.  Design, Testing And Commissioning Of A Synchronous Motor-Gear-Axial Compressor. , 1983 .

[13]  W. Ko,et al.  Identification of modal parameters from measured output data using vector backward autoregressive model , 2002 .

[14]  Charles Jackson.  Four Compressor Trains Of A Large Ethylene Plant-Design, Audit, Testing And Commissioning , 1981 .

[15]  J. W. Lund,et al.  Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings , 1974 .

[16]  K. Kwanka.  Magnetic Excitation of a Three-Bearing Rotor , 1992 .

[17]  Robert X. Perez,et al.  Assessing Rotor Stability Using Practical Test Procedures. , 1992 .

[18]  Hiroshi Kanki,et al.  High stability design for new centrifugal compressor , 1989 .

[19]  C. Hunter Cloud,et al.  Comparison of Modal Parameter Estimation Techniques for Electromechanical Rotordynamics of Cage Induction Motors , 2007 .

[20]  John C. Nicholas,et al.  Surveying Tilting Pad Journal Bearing And Gas-Labyrinth Seal Coefficients And Their Effect On Rotor Stability. , 2007 .

[21]  Vijay K. Sood.  Design And Full Load Testing Of A High Pressure Centrifugal Natural Gas Injection Compressor , 1979 .

[22]  R. Kumaresan,et al.  Estimating the parameters of exponentially damped sinusoids and pole-zero modeling in noise , 1982 .

[23]  Api Standard.  Axial and Centrifugal Compressors and Expander-compressors for Petroleum, Chemical and Gas Industry Services , 2002 .

[24]  Lloyd E. Barrett,et al.  Damping Ratio Estimation Techniques for Rotordynamic Stability Measurements , 2008 .

[25]  Urs Baumann.  Rotordynamic Stability Tests On High-Pressure Radial Compressors. , 1999 .