On a Persistent Misunderstanding of the Role of Hysteretic Damping in Rotordynamics

[+] Author and Article Information
Giancarlo Genta

Politecnico di Torino, Department of Mechanics, Corso Duca degli Abruzzi 24, 10039 Torino Italy e-mail: giancarlo.genta@polito.it

J. Vib. Acoust 126(3), 459-461 (Jul 30, 2004) (3 pages) doi:10.1115/1.1759694 History: Received June 01, 2003; Revised January 01, 2004; Online July 30, 2004
Copyright © 2004 by ASME
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Nondimensional Campbell diagram and decay rate plot for a Jeffcott rotor with hysteretic damping with η=0.05. The nondimensional speeds and decay rate are: Ω*=Ω/k/m,ω*=ω/k/m and σ*=σ/k/m. Both the solutions from Eqs. (8) and (9) are reported, but the difference is noticeable only in the zone close to the critical speed, magnified in the circles.
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Campbell and the decay rate plots for the hinged-hinged beam studied in 6, Fig. 3.
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Roots locus for the first forward mode for the simply supported beam studied in 6. The FEM results obtained through the DYNROT code are plotted together with the results obtained in 6.




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