Predicting critical speeds in various rotordynamics problems. (November 2017)

• Record Type: Journal Article
• Authors: Plaut, Raymond H; Virgin, Lawrence N; Knight, Josiah D
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 231:Number 21(2017)
• Page Start: 3913
• Page End: 3922
• Publication Date: 2017-11
• Subjects: Rotordynamics -- critical speed -- amplitude data -- rotating shaft; Mechanical engineering -- Periodicals; 621.05
• DOI: 10.1177/0954406216659680
• Languages: English
• ISSNs: 0954-4062

Abstract

Rotating shafts often experience undesirable large-amplitude whirling oscillations associated with resonance at critical speeds. This paper further develops a nondestructive technique in which measured information about the growing nature of the response is used to predict an incipient critical speed. A number of models of varying degrees of sophistication are developed and tested using the new approach, but the main advantage of the method is that it is model-free and thus possesses considerable practical utility. In addition, further experimental results are presented for the case of two disks mounted on a shaft, and the technique is successfully demonstrated in predicting a critical speed associated with a higher mode.