Analyzing rotating data for machines rotor with high speeds using the spectral map wizard

Analyzing rotating data requires a tachometer measurement to estimate the machine RPM as a function of time. The accuracy of the RPM versus time function is important for analyzing rotating data. Vibration measurements can be expressed in terms of displacement, velocity, acceleration, and high frequency content (for bearing condition detection). Most data collectors use FFT (Fast Fourier Transform) to convert the data from the time domain to the frequency domain. Vibration data collectors have a built-in PC interface that allows transfer of the measurements to a PC for data management. Analysis software displays spectrum, trend, waterfall plots, and waveform for advanced analysis. To assess a machine, the vibration data is compared with historical profiles from the same machine. In this research an RPM spectral map plots frequency along the x axis, amplitude along the y axis, and shaft speed in revolutions per minute (RPM) along the z axis. View an RPM spectral map to determine, how vibration changes with machine speed, and which components are related to rotational speed. The experimental technique used thus far is called Modal Testing; the technique has recently been applied to rotating structures. The objective of study, it is envisaged that the approach isn't limited to the condition monitoring and predictive failure but could help the designers to have better understanding of rotor performance at the system design stage.

[1]  W. J. Chen.  A Note on Computational Rotor Dynamics , 1998 .

[2]  Demeter G. Fertis,et al.  Mechanical And Structural Vibrations , 1995 .

[3]  P. Pennacchi,et al.  Measures of Accuracy of Model Based Diagnosis of Faults in Rotormachinery , 2001 .

[4]  Paolo Pennacchi,et al.  Accuracy of modelling and identification of malfunctions in rotor systems: experimental results , 2000 .

[5]  Jh Ginsberg,et al.  Mechanical and Structural Vibration: Theory and Applications , 2001 .

[6]  Arthur W. Lees,et al.  EXPERIMENTAL IDENTIFICATION OF EXCITATION AND SUPPORT PARAMETERS OF A FLEXIBLE ROTOR-BEARINGS-FOUNDATION SYSTEM FROM A SINGLE RUN-DOWN , 2000 .

[7]  John M. Vance,et al.  Machinery Vibration and Rotordynamics , 2010 .

[8]  R. Potter,et al.  Computed Order Tracking Obsoletes Older Methods , 1989 .

[9]  Aly El-Shafei,et al.  Model Calibration of Anisotropic Rotordynamic Systems With Speed-Dependent Parameters , 2008 .

[10]  Anindya Chatterjee,et al.  Modal projections for synchronous rotor whirl , 2008, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[11]  B. Moore.  Principal component analysis in linear systems: Controllability, observability, and model reduction , 1981 .

[12]  A. W. Lees,et al.  8th International Conference on Vibrations in Rotating Machinery, Swansea, UK , 2004 .

[13]  H. D. lrretier.  History and development of frequency domain methods in experimental modal analysis , 2002 .

[14]  K. Kimura,et al.  Vibration analysis of a high speed and light weight rotor system subjected to a pitching or turning motion: II: A flexible rotor system on flexible suspensions , 1995 .

[15]  Charles T. Hatch,et al.  Fundamentals of Rotating Machinery Diagnostics , 2003 .

[16]  Y. Ishida,et al.  Linear and Nonlinear Rotordynamics: A Modern Treatment with Applications , 2002 .

[17]  D. J. Ewins,et al.  Modal analysis and testing of rotating structures , 2001, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[18]  D. Kammer.  Sensor Placement for On-Orbit Modal Identification and Correlation of Large Space Structures , 1990, 1990 American Control Conference.

[19]  D. Inman.  Vibration control , 2018, Advanced Applications in Acoustics, Noise and Vibration.

[20]  Chong-Won Lee,et al.  Excitation methods and modal parameter identification in complex modal testing of rotating machinery , 1993 .

[21]  Claudie Hutin.  Modal analysis using appropriated excitation techniques , 2000 .

[22]  D. J. Ewins,et al.  Modal Testing: Theory and Practice , 1984 .

[23]  Jimin He,et al.  1 – Overview of modal analysis , 2001 .