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1 Transactions of the Institute of Fluid-Flow Machinery

1 2003

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Influence of the blade length on natural frequencies and modes shapes of two bladed rigid discs on the shaft

Sokołowski J., Rządkowski R., Kwapisz L.

Transactions of the Institute of Fluid-Flow Machinery

2003

nr 114

177-190

The dynamic behaviour of a rotor consisting of two bladed discs on a solid shaft is considered. The effect of shaft flexibility on the dynamic characteristics of the bladed discs and the coupling effects between the shaft and bladed disc modes are investigated. Results presented for various cases with differing blades flexibility show cleary the coupling effects in a bladed disc-shaft system. Calculated natural frequencies obtained from blade, shaft, bladed disc and shaft with two discs are checked to discover resonance conditions and the coupling effects. The calculations show the influence of the shaft on the natural frequencies of the bladed discs up to one nodal diameter frequencies. The torsional frequency of the shaft with two discs is coupled with the zero nodal diameters modes of the single bladed discs. The bending modes of the shaft are coupled with one nodal diameter modes of the bladed discs. It is shown that including the shaft in the bladed discs model is important from the designer's point of view and can change the spectrum of frequencies considerably.