There are essentially two strategies for vibration analysis of non-linear rotor-bearing-foundation systems, such as systems with hydrodynamic journal bearings:
  1. Linearization in the vicinity of a stable equilibrium position. This approach is very effective if the Rotor-Bearing-Foundation (RBF) system equilibrium is stable and vibrations are sufficiently small. TURBINE-PAK is an advanced software tool that implements this approach for practical and effective engineering use.
  2. Direct solution of the non-linear differential equations of motion in the time domain. This approach is necessary for the non-linear transient motion analysis, studying of large vibration as well as for analysis of unstable rotor systems. Please see TURBINE-PAK NON-LINEAR for more information about this strategy.

TURBINE-PAK is an advanced scientific software for vibration analysis of non-linear multi-bearing Rotor-Bearing-Foundation (RBF) systems. It performs linearization of non-linear RBF systems in the vicinity of their current equilibrium position and uses animated graphic user interface to communicate results of computations.  

Highlights of TURBINE-PAK:
  • Designed for practical and effective analysis of multi-bearing rotor systems with up to 50 bearings on elastic foundation (hyperstatic system analysis)
  • Extensive hydrodynamic and hydrostatic bearing support (including multi-pad, elliptical, fixed pad, rolling pad and pivot pad journal bearings).
  • Optimized real-time Computational Fluid Dynamics (CFD) calculations for hydrodynamic bearings (no databases) - enabling almost an infinite number of bearing configurations.
  • Comprehensive treatment of machine alignment, including alignment identification on the basis of bearing eccentricity measurement. (In multi-bearing systems with non-linear hydrodynamic bearings vibration response depends on bearing alignment).
  • Unknown static load identification algorithms from bearing eccentricity measurement
  • Modelling vibration of a non-straight (pre-bent) shaft in hydrodynamic bearings
  • Modelling vibration of machines with a vertical shaft in hydrodynamic bearings
  • High computational efficiency on Pentium class computers running Win98. Recalculation of all 8 bearing characteristics, global equilibrium position and the vibration response for a @600 MW turbine-generator can take less than a minute.
  • Visualization. Solutions can be animated.
  • Open style, fully documented ASCII type input and output files, enabling the user to access, process and/or generate data >practically without restrictions.
  • Mobile computing. TURBINE-PAK can be installed on a portable computer (laptop) to assist in field diagnostics and field troubleshooting without any loss of performance.
  • Sharing RBF input data files with TURBINE-PAK NON-LINEAR
  • Extensively tested and verified by leading Turbine Manufacturers, academics and Research Laboratories over the last 10 years.
  • Developed and maintained by scientists (PhD) with over 25 years of research and consulting experience in the field of rotordynamics and vibration analysis. If you find a feature that is missing, we can customize TURBINE-PAK to meet your particular requirements.

Rotor-Bearing-Foundation (RBF) System Vibration response computation

TURBINE-PAK computes the RBF system vibration response as a function of:

  • the system configuration (static load and alignment)
  • bearings (types, geometry, lubricant properties etc.)
  • shaft (geometry, pre-bending, material properties, temperature distribution etc.)
  • foundation and casings dynamic properties (general FEM superelement model)
  • rotor speed
  • excitation forces and unbalance

Eigenvalue analysis

TURBINE-PAK can perform the eigenvalue analysis of the linearized RBF system considering:

  • system configuration (alignment, static load etc.)
  • bearings (types, geometry, lubricant properties etc.)
  • shaft (geometry, material properties , temperature distribution etc.)
  • foundation and casings dynamic properties (FEM superelement model)
  • rotor speed

Modelling changes in machine vibration due to parameter change

User can modify, among other parameters, bearing alignment, unbalance, bearing types, geometry or other properties, rotor speed, foundation properties etc., and observe the resulting changes in the system vibration response, natural frequencies, mode shapes and the global system stability. Various cases can be instantly compared.


TURBINE-PAK fully animated graphical interface greatly enhances our understanding of machine dynamic characteristics and vibration response. TURBINE-PAK provides:

  • Global motion animation
  • Animation of left and right complex eigenvectors
  • Animation of the detailed behavior of the shaft in each bearing, showing foundation, shaft and relative motion, as well as bearing reactions, linearized stiffness and damping matrices.
  • Accurate phase relationships is preserved in TURBINE-PAK animation.
  • Unbalance response and other excitation response could be animated simultaneously.
  • Rapid comparison of various animated systems/cases/conditions using in most cases single keystrokes.

amn1.gif (12619 bytes)
Fig 1. TURBINE-PAK global motion screen. Steady state system response to unbalance located between bearings 3 and 4.

TURBINE-PAK applications

  • TURBINE-PAK has been found to be one of the most practical, efficient and effective tools in trouble shooting of vibration problems in rotating machinery. Using TURBINE-PAK, possible reasons for machine vibration problems can be established and tested using a computer model of the machine. Possible solutions and remedies can be tested on the computer model first, before they are implemented. In many cases this strategy was found not only to be highly practical and effective, but also more economical. A number of case histories that demonstrate TURBINE-PAK ability to solve practical problems in rotating machinery have been published in scientific journals and international rotordynamic conferences. (See for example T.J.Chalko, D.X.Li, Modelling Turbine Vibration in Terms of its Load Variation, International Journal of Rotating Machinery, 1995, Vol 1, No 3-4, pp. 295-299)
  • TURBINE-PAK currently serves as a tool for turbine and rotating machinery designers. Using TURBINE-PAK, various machine modifications can be evaluated from the point of view of machine vibration before they are implemented.
  • TURBINE-PAK is also a very effective training tool for vibration engineers. TURBINE-PAK's ability to show in detail the total animated motion of the machine can demonstrate and explain easily even the most complex relationships governing the machine vibration.
  • TURBINE-PAK can be used as a training tool for the machine operating personnel. The ability of the machine operating personnel to understand its vibration contributes directly to better maintenance and  longer service of the unit.
  • TURBINE-PAK can be used as an aid in machine monitoring and maintenance. Every machine operator can greatly benefit from having a reliable computer model of his particular machine that is capable of predicting its vibration as a function of the operating parameter change.
  • TURBINE-PAK is currently used for experimental laboratory rigs and rotordynamics research.


TURBINE-PAK comes with comprehensive documentation that includes the Theoretical Manual.


Technical support is available to registered users only and is normally limited to the assistance in use of all available features of TURBINE-PAK and solving problems preventing the user from using these features.

Access to our support is available 24 hours a day, most days in the year via email tjc@sci-e-research.com for the first 12 months after User registration. Customization of the program, as well as support for longer periods of time can be arranged at additional cost. The benefit of maintaining the User Support is receiving TURBINE-PAK software upgrades at no additional cost.

For the first time Users of TURBINE-PAK, SER will, on the basis of the User data, prepare a complete TURBINE-PAK data set for one set of rotor-bearing-foundation system. This free modeling service is designed to provide the User with a complete, ready to use system, immediately after installation.

If the User data is unavailable at the time of ordering TURBINE-PAK, SER will deliver TURBINE-PAK with a complete example set of data, representing some hypothetical rotor-bearing-foundation system.

ON-SITE training

On-site User training is available on request in the following areas

  • theoretical rotordynamics
  • vibration analysis
  • machine modelling for vibration analysis - the fastest way from drawings to a computer model
  • effective using of TURBINE-PAK


TURBINE-PAK software updates are free of charge during the first 12 months after TURBINE-PAK registration as well as thereafter, providing that the User continues to maintain the Technical Support from SER after the initial 12 month period.

Scientific references

  • Chalko T.J., Li D.X., Modelling Turbine Vibration in Terms of its Load Variation, International Journal of Rotating Machinery, 1995, Vol 1, No 3-4, pp. 295-299
  • Chalko T.J., Li D.X., Bearing Alignment Estimation in Rotating Machinery,  Proceedings of 6-th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-6) Honolulu, Hawaii, USA, Feb 23-28, 1996
  • Li D.X., Chalko T.J., Hydrodynamic Characteristics of Combination Pad Journal Bearing,  Proceedings of 6-th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-6) Honolulu, Hawaii, USA, Feb 23-28, 1996
  • Chalko T.J., Li D.X., Estimation of Alignment and Transverse Load in Multi-Bearing Rotor Systems International Journal of Rotating Machinery, 1996, Vol. 1, No. 7-8, pp 593-602

Professional contact

Dr Tom J Chalko

Dr Thomas J. Chalko MSc, PhD
email: tjc@sci-e-research.com
Fax: +61 5681 6361
945 Gunyah Rd, Mt Best,
Vic 3960, Australia

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