翼フラッタの音波によるアクティブコントロール : 第1報,低周波数,翼面に平行にスピーカ面を配置した場合(流体工学,流体機械)

概要

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The paper presents a theoretical analysis and an experimental study of blade flutter suppression by means of active acoustic excitation. In the theoretical analysis, a linearized mathematical method to calculate the aerodynamic force and work on an oscillating airfoil interacting with sound waves generated from a loud-speaker mounted at a wall surface of a wind tunnel is formulated. Dependence of the suppression effect on the location, width of the actuator surface and the phase difference between the blade and actuator surface oscillations are investigated. Both theoretical and experimental results show that the actuator surface oscillation most effectively suppresses a coupled bending-torsional oscillation of the blade when the center of the loud-speaker diaphragm is placed a quarter blade chord downstream from the leading edge of the blade. Furthermore a 12.5% increase in a critical flutter velocity could be attained by the active control system.
社団法人日本機械学会の論文
2003-07-25