Effectofaxialforceonnaturalfrequencyoflateralvibrationofmarinepropulsionshafting

ZOUDong-lin1,2,XUNZhen-yu3,HUAChun-li1,2,TANa1,2,RAOZhu-shi1,2

Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (14) : 206-210.

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (14) : 206-210.

Effectofaxialforceonnaturalfrequencyoflateralvibrationofmarinepropulsionshafting

  • ZOUDong-lin1,2,XUNZhen-yu3,HUAChun-li1,2,TANa1,2,RAOZhu-shi1,2
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Abstract

AnonlinearrotordynamicmodelunderaxilthrustwasestablishedbyNewtonianformuladuetolargedeformationanditwassolvedbythemethodofmultiplescales.Theeffectsofaxialforceonnaturalfrequencyoflateralvibrationofamarinepropulsionshaftingwerestudied.Theresearchshowsthatlateralnaturalfrequenciesarereducedduetoaxialforcewithoutconsiderationoflargedeformationandareincreasedduetothegeometricalnonlinear.Whenthevibrationamplitudeisbig,thegeometricalnonlinearisdominant,leadingtotheincreaseofthenaturalfrequency.The
resultalsoshowsthatthegeometricalnonlineareffectsaremuchgreaterwithragardtothehighfrequencies.Theseanalysescanbereferenceandguidancetothedesignofmarinepropulsionshafting.

Key words

axialforce / propulsionshafting / multiplescales / geometricalnonlinear / naturalfrequency

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ZOUDong-lin1,2,XUNZhen-yu3,HUAChun-li1,2,TANa1,2,RAOZhu-shi1,2. Effectofaxialforceonnaturalfrequencyoflateralvibrationofmarinepropulsionshafting[J]. Journal of Vibration and Shock, 2015, 34(14): 206-210

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