● TITLE: Optimal damping of flexibly-mounted rotor
● AUTHORS: Porat, I. (1934-2012)
● SOURCE: Israel J. Technol, v. 7, pp. 235-245 (1969).
● LANGUAGE: English.
● ABSTRACT SOURCE: Israel J. Technol, v. 7, p. 235 (1969).
● ABSTRACT: A flexibly-mounted rotor operates well at high speeds and low damping. Hence the need for frequency-dependent damping that would be low at the level of the rotational frequency, and increase at the critical points. A common means for achieving this type of damping consists in providing the system with additional degrees of freedom and applying the damping to the additional masses instead of directly to the rotor. Satisfactory damping then minimizes the divergent frequencies (so as to simplify the design) and ensures equality of the natural frequencies of the system and damper. In that case high damping within a narrow range (bandwidth) is obtainable under minimal friction. The proposed solution consists in proving the motion-parallelism principle for a high-speed rotor (which is important per se), while reducing the number of degrees of freedom of the system, regarded as consisting of masses and springs only, in which case a simple criterion for optimal damping is obtainable.

● 9 references:

Bousso, D., "A stability criterion for rotating shafts," D.Sc. thesis (1963) (In Hebrew)
Abstract in English Abstract in Hebrew

and more 8 references.

● COMMENT: Proceedings of the Seventeenth Israel Annual Conference on Theoretical and Applied Mechanics, Haifa, 1969.

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