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Main Research Topics

Modeling and analysis of dynamic interactions

Modelling of dynamic impacts occurring in complex rotor-bearing-support systems using non-linear methods.

A rotating machine is a complex mechanical system comprising three main components:

  1. rotor,
  2. bearings,
  3. supports.

As a result of many years of work, our scientific team has proposed a new and unified description of a rotating machine in the form of a computing environment, called MESWIR. This description is appropriate for both small rotating machines and large power machinery such as steam turbine sets. The "MESWIR" system enables analysis of dynamic properties of rotating machinery throughout the whole speed range which goes well beyond the border of stability. Its essence is non-linear description of the physical phenomena, occurring in rotor dynamics. Therefore, it is possible to analyze vibration after crossing the stability border as well as to generate nonelliptical displacement trajectories and complex spectrum graphs within a stable operating range by means of a single software tool (Fig. 1). The system also provides the possibility to model rotating systems with different types of defects. (Fig. 2).

Fig.1: The Idea of non-linear description applied in the "MESWIR" software.

Przykład modelu MES linii wirników z defektami.

Fig.2: Example of FEM rotor model including defects.


A detailed description of the MESWIR computing environment can be found in the monograph, available at:
http://www.dynamika-wirnikow.imp.gda.pl/r3.htm

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Experimental studies of machinery

Staff members of the Department perform experimental research of developed prototypes as well as research and development activities in favour of industry and business. Research on different types of machinery used mainly in power engineering, but also in other branches of industry has been carried out for many years. Examples of the objects studied include turbo-generator units, micro-turbines, hydrosets, pumps and machine tools. The acquired experience and modern apparatus make it possible to measure vibration, stress, temperature and pressure distributions, flow rate, rotational speed and noise level. Results of measurements contribute to the assessment of technical condition and performance of machinery and are needed to make recommendations  for necessary repairs, thus allowing for their subsequent operation. We also create diagnostics systems designed for specific machinery.

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Fig. 1. The test stand used for  testing of rotor - bearings - support in various configurations.

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Renewable power industry

The Department of Turbine Dynamics and Diagnostics participates in the work on the development and promotion of renewable energy sources. Actions in this direction are implemented through taking part (often acting as a project coordinator) in R&D projects developing eco-friendly technologies.  The Department’s interests include (but are not limited to) : ORC-based cogeneration systems, utilisation of waste heat, wind turbines, water turbines, as well as heat transfer issues. We also deal with subjects focusing on efficient use of renewable sources of energy in small houses, multi-occupied buildings, agricultural holdings and municipal energy centers.

Fig. 1. The design concept of the micro power station
(cogeneration-type, based on ORC).

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