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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/46444

    Title: The lifting rotor inflow mode shapes and blade flapping vibration system eigen-analysis
    Authors: Wang, Yi-Ren;Peters, David A.
    Contributors: 淡江大學航空太空工程學系
    Keywords: Dynamics;Eigenvalues and eigenfunctions;Helicopter rotors;Lift;Mathematical models;Mathematical transformations;Matrix algebra;Three dimensional;Turbomachine blades;Unsteady flow;Velocity;Wakes;Axial flight flapping modes;Blade flapping vibration system;Eigenanalysis;Lifting rotor inflow mode;Peters generalized dynamic inflow theory;Unsteady wake model;Vibrations (mechanical)
    Date: 1996-07
    Issue Date: 2013-03-20 16:24:44 (UTC+8)
    Publisher: Amsterdam: Elsevier BV
    Abstract: The three-dimensional helicopter rotor inflow vibrating modes and rigid blade flapping motion coupled with unsteady wake system have been studied through eigen-analysis. The Peters' generalized dynamic inflow theory has been chosen as the unsteady wake model. The three-dimensional inflow velocity vibrating mode shapes for node lines have been plotted in various skew angles. The continuous motions of these mode shapes provide important information and insight into the physical phenomenon of a helicopter rotor-wake aeroelastic system. The damping of axial flight flapping modes and the flapping divergent boundary in forward flight have been compared with Su's and Lowis' rsults, respectively, to show the accuracy of our model. The results of this work give us stability information about a rotor aeroelastic system and also reveal that the induced flow has a profound effect on blade dynamics even at high advance ratios. The effect may cause an earlier unstable condition for a helicopter rotor system.
    Relation: Computer Methods in Applied Mechanics and Engineering 134(1-2), pp.91-105
    DOI: 10.1016/0045-7825(96)01027-4
    Appears in Collections:[Graduate Institute & Department of Aerospace Engineering] Journal Article

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