The effects of non-synchronousrotatingdamping, i.e., of energy dissipation in elements rotating at a speed different from that of the main rotor, on the dynamic behaviour of the latter have been already studied in a previous paper (J. Rotating Machinery 6 (6) (2000)) for the case of non-gyroscopic rotating systems. A planar model, namely the Jeffcott's rotor, was used. The present study is aimed at investigating, through analytical and numerical models, the behaviour of rotors having a non-negligible gyroscopic effect. The parameters of the system affecting the dynamic stability are identified and the threshold of instability is then computed. A sort of map of stability is provided to allow mechanical engineers predicting possibile range of instability for forward and backward whirling motions. An experimental validation on a simple test rig is presented in order to show the effectiveness of the proposed stability analysis. Non-synchronousrotatingdamping is implemented by using a non-synchronous electromagnetic damper based on eddy currents.
Non-synchronous rotating damping effects in gyroscopic rotating systems / Brusa, Eugenio; Zolfini, G.. - In: JOURNAL OF SOUND AND VIBRATION. - ISSN 0022-460X. - 281:3-5(2005), pp. 815-834. [10.1016/j.jsv.2004.02.019]
Non-synchronous rotating damping effects in gyroscopic rotating systems
BRUSA, Eugenio;
2005
Abstract
The effects of non-synchronousrotatingdamping, i.e., of energy dissipation in elements rotating at a speed different from that of the main rotor, on the dynamic behaviour of the latter have been already studied in a previous paper (J. Rotating Machinery 6 (6) (2000)) for the case of non-gyroscopic rotating systems. A planar model, namely the Jeffcott's rotor, was used. The present study is aimed at investigating, through analytical and numerical models, the behaviour of rotors having a non-negligible gyroscopic effect. The parameters of the system affecting the dynamic stability are identified and the threshold of instability is then computed. A sort of map of stability is provided to allow mechanical engineers predicting possibile range of instability for forward and backward whirling motions. An experimental validation on a simple test rig is presented in order to show the effectiveness of the proposed stability analysis. Non-synchronousrotatingdamping is implemented by using a non-synchronous electromagnetic damper based on eddy currents.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2290407
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