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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Measurement of modal and damping behavior of bladed disc with rhombic shroud
 Pešek, Luděk ; Košina, Jan ; Cibulka, Jan
The aim of the work was modal analysis of the bladed disc with the rhombic shroud in a range up to 8kHz. The eigenfrequencies and corresponding damping ratios with respect to a number of nodal diameters were to evaluate. To obtain the maximal amplitude excitation, different types of actuators for lower frequency (up to 5 kHz) and higher frequency (above 5 kHz) ranges were used. The responses of the blades were measured by miniature accelerometers during the swept harmonic excitation. The result of the modal analysis are presented in a form of SAFE diagrams. The crossing and veering of dispersion curves appear in the SAFE diagram. It causes excitation and separation of modes very complicated problem from the identification point of view. Despite these obstacles the major part of the seeking resonances in the defined frequency range were successfully excited and identified.
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