1984
DOI: 10.1115/1.3269158
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Whirl Speeds and Unbalance Response of Multibearing Rotors Using Finite Elements

Abstract: This paper presents dynamic modeling of rotor bearing systems with rigid disks, distributed parameter finite rotor elements and flexible, discrete multibearings. The previous works have included the effects of rotary inertia, gyroscopic moment, axial load, internal viscous and hysteretic damping and transverse shear deformations, but have not considered them all in the same model. A computer program is developed in this work to calculate the forward and backward whirl speeds, the corresponding mode shapes, the… Show more

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Cited by 85 publications
(17 citation statements)
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“…The rotor-bearing system having discrete discs and bearings and a shaft with distributed mass and elasticity is considered in the present study. Dynamic modelling of the rotor-bearing system using finite elements developed by Nelson and McVaugh [8] and the extended model by Ozguven and Ozkan [9] have been used. Internal damping is neglected here.…”
Section: System Equation Of Motionmentioning
confidence: 99%
See 1 more Smart Citation
“…The rotor-bearing system having discrete discs and bearings and a shaft with distributed mass and elasticity is considered in the present study. Dynamic modelling of the rotor-bearing system using finite elements developed by Nelson and McVaugh [8] and the extended model by Ozguven and Ozkan [9] have been used. Internal damping is neglected here.…”
Section: System Equation Of Motionmentioning
confidence: 99%
“…The details of mass, damping and stiffness matrices of Eq. (1), except for the cracked element, are given in references [8,9].…”
Section: System Equation Of Motionmentioning
confidence: 99%
“…The equation of motion of the complete rotor system in a ®xed coordinate system can be written as (1), except for the coupling element, are given in references [20] and [21]. The excitation matrix {Q} in equation (1) consists of the unbalance forces due to the disc having mass m and eccentricity e, the weight of the disc and reaction forces due to coupling misalignment.…”
Section: Nelson and Mcvaughmentioning
confidence: 99%
“…Zorzi and Nelson's research was lacking in that they neglected the effects of rotary inertia and shear deformation. Ozguven and Ozkan in [13] did however take Zorzi and Nelson's work further by including Timoshenko beam theory in their solution. Ozguven and Ozkan calculated the complex eigenvalues for a Timoshenko shaft and compared the results to that of a Rayleigh beam.…”
Section: I212 the Role Of Dampingmentioning
confidence: 99%
“…A continuous, static, clamped-free, Euler-Bernoulli Beam of circular section and submitted to bending (exclusively) load is considered as the model in which the crack defect will be introduced in order to observe the compliance variation effects during discrete 13 rotation.…”
Section: Chaptermentioning
confidence: 99%