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Experimental analysis of friction coupling in triple blade bundle under rotation
Pešek, Luděk ; Půst, Ladislav ; Bula, Vítězslav ; Vaněk, František ; Cibulka, Jan
In the contribution the experimental analysis of these blades in two opposed bundles under rotation will be presented. One-point electromagnetic synchronized pulse excitation served as a force excitation for analysis of resonant vibration under different revolution speeds. The force level was evaluated from supply current calibrated by dynamic scale measurement. The responses of the blades were measurement by strain-gauges placed on the blades with a slip-ring signal transmission. After sufficient level of first flexural (axial) blade vibration the electromagnetic force was turned off and vibration attenuations were analyzed. The dynamic behaviour of the blades and results of damping are in a good accordance with the numerical modelling.
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Design of electromagnetic of shrouded blades excitation in Erosion stand
Pešek, Luděk ; Vaněk, František ; Bula, Vítězslav ; Cibulka, Jan
The research report was elaborated in frame of the contract with Skoda Power a.s. and Institute of Thermomechanics AS CR, v.v.i.. The aim was to design the electromagnetic excitation of bladed disc in the Erosion stand. In the report the multi electromagnetic excitation design, the production drawings of electromagnets UTM4, their electrical connections and their placement in the stand are presented. Furthermore the methods of electromagnet synchronization for an excitation of the blade and disc vibration modes are discussed. The results of verification tests both in still and rotating states on the test rigs of IT AS CR conclude the report.
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