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contributor authorSongqi Chen
contributor authorShengpei Liu
date accessioned2017-05-08T23:23:46Z
date available2017-05-08T23:23:46Z
date copyrightOctober, 1986
date issued1986
identifier issn1048-9002
identifier otherJVACEK-28971#434_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/101885
description abstractIn this paper, the equivalent linearization of an intershaft squeeze film damper in a two shaft engine system is investigated. The two shaft centers at the damper position are assumed to move in different elliptical offset orbits and at synchronous frequency with the unbalanced rotor (e.g., the high pressure rotor). The nonlinear damper force is resolved into two orthogonal components along the absolute coordinate directions and, in turn, each of these force components is supposed to be equivalent to the sum of an average force, a linear spring force, and a linear damping force in the corresponding direction. By using the method of equivalent linearization by harmonic balance, the six parameters of the equivalent forces, including two average forces, two equivalent spring coefficients, and two equivalent damping coefficients, are expressed analytically by the squeeze film forces and the assumed orbital motion of the two shaft centers at the damper position. The analytical expressions of the squeeze film forces are derived from an approximate solution of the basic Reynolds equation. The results obtained are verified by the method of equivalent linearization by minimum mean square errors. It shows that the six obtained parameters make the mean square errors minimum over a cycle period of motion, the errors being the difference between the equivalent forces and the actual nonlinear forces.
publisherThe American Society of Mechanical Engineers (ASME)
titleEquivalent Linearization of a Squeeze Film Damper
typeJournal Paper
journal volume108
journal issue4
journal titleJournal of Vibration and Acoustics
identifier doi10.1115/1.3269367
journal fristpage434
journal lastpage440
identifier eissn1528-8927
keywordsDampers
keywordsForce
keywordsErrors
keywordsSprings
keywordsMotion
keywordsDamping
keywordsRotors
keywordsCycles
keywordsEquations
keywordsEngines AND High pressure (Physics)
treeJournal of Vibration and Acoustics:;1986:;volume( 108 ):;issue: 004
contenttypeFulltext


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