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Introduction to Rotor Dynamics
2013Rotor-dynamics studies the lateral and torsional vibrations of rotating shafts, with the objectives of predicting the rotor vibrations and constraining the vibration level under an acceptable limit. In this chapter we present a short introduction to rotor dynamics to familiarize the reader with the basic concepts and terminologies commonly used in ...
Se Young Yoon +2 more
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Dynamic Interactions between Fast Microscale Rotors
Journal of the American Chemical Society, 2009Trimetallic catalytic microrotors were fabricated by electrodeposition of cylindrical Au-Ru rods in the pores of anodic alumina membranes, dissolution of the template membrane, and then sequential vapor deposition of Cr, SiO(2), Cr, Au, and Pt on one side of each rod.
Yang, Wang +6 more
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2011
The industrial revolution began with reciprocating steam engines as devised by James Watt in 1780, and the 19th century witnessed a rapid expansion in various industrial sectors. Unfortunately, the reciprocating steam engine had several problems because of external combustion and excessive alternating load due to reciprocating masses that limited ...
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The industrial revolution began with reciprocating steam engines as devised by James Watt in 1780, and the 19th century witnessed a rapid expansion in various industrial sectors. Unfortunately, the reciprocating steam engine had several problems because of external combustion and excessive alternating load due to reciprocating masses that limited ...
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Dynamic balancing of small gyroscope rotors
Electrical Engineering, 1937Discussion of papers published in the June 1937 issue, pases 706–10 and 729–34, and presented for oral discussion at the vibration and balance session of the summer convention, Milwaukee, Wis., June 25,1937.
O. E. Esval, C. A. Frische
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1963
Abstract : The determination of the critical speeds of a flexible rotor is usually carried out on the assumptions of negligible bearing mass and stiff ness. In this report the effect of bearing mass and stiffness on the natural frequencies of a uniform flexible shaft is found.
D. E. Dawson, J. E. Panarelli
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Abstract : The determination of the critical speeds of a flexible rotor is usually carried out on the assumptions of negligible bearing mass and stiff ness. In this report the effect of bearing mass and stiffness on the natural frequencies of a uniform flexible shaft is found.
D. E. Dawson, J. E. Panarelli
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Insights into linearized rotor dynamics
Journal of Sound and Vibration, 1981Abstract Over the last 20 years, linearized rotor-bearing models have been used in lateral vibration analyses of numerous rotating machines: i.e., prediction of critical speeds, unbalance response, non-synchronous response, and instability threshold speed.
Adams, M. L., Padovan, J.
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Hingeless rotor dynamics in coordinated turns
31st Structures, Structural Dynamics and Materials Conference, 1990This paper describes the results of a numerical study of the aeroelastic stability and response of a soft-in-plane, hingeless rotor helicopter undergoing a coordinated steady turn. The combined effects of turn rate, aircraft speed, flight path angle, and direction of turn are discussed.
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Rotor Casing Contact Phenomenon in Rotor Dynamics — Literature Survey
Journal of Vibration and Control, 2010Rubbing between a rotor and its casing has long been recognized as a major contributor to excessive maintenance and in general to machinery failure. During contact, the high energy of the rotor, dissipated by the frictional force, can severely damage both parts, and can lead to total destruction of the machine.
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Rotor Dynamics and Helicopter Stability
Aircraft Engineering and Aerospace Technology, 1963The component of velocity, μ0ΩR, along the x‐axis is specified, and also X, the angle of inclination of the flight path. The concept of the ‘internal’ and ‘external’ parameters of the motion is introduced, the ‘internal’ parameters consisting of certain combinations of the control and flapping angles θ0, θ1, θ2, β0, β1, β2 and the ‘external ...
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The dynamics of viscoelastic rotors
Dynamics and Stability of Systems, 1987The stability of two mathematical models of a viscoelastic rotor—a 2-parameter solid model and a 3-parameter solid model—is investigated by means of a complex Routh—Hurwitz analysis. While the 2-parameter model possesses a certain well-known stability limit for the angular velocity, it is shown that the 3-parameter model has two stable regions for the ...
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