**7. Conclusion**

Steam turbines, which are of vital importance for any economy, have always been at the leading edge of technical diagnostics development. A variety of vibration monitoring systems is available on a commercial scale, usually tailored to individual needs. Some of them are referred to as 'diagnostic systems', which is not always strictly true, as many merely provide data for diagnostic reasoning.

In general, qualitative diagnostics is currently based on well-established procedures and rules, especially for harmonic components. Quantitative condition assessment seems to be at

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an earlier development stage, at least when it comes to practical applications. Its importance is, however, appreciated, in view of introducing predictive maintenance. As a turbine model suitable for theoretical determination of quantitative diagnostic relations still remains to be developed, much of the work in this field employs empirical data. It seems justified to say that reliable forecasting of technical condition development is currently the major challenge that faces specialists in this field throughout the world.
