Impulsive noise reduction is provided in a rotor blade by "acoustically sweeping" the chord line from root to tip so that the acoustic radiation resulting from the summation of potential singularities used to model the flow about the blade tend to cancel for all times at an observation point in the acoustic far field.
申请公布号
US4168939(A)
申请公布日期
1979.09.25
申请号
US19770831633
申请日期
1977.09.08
申请人
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
发明人
SCHMITZ, FREDRIC H.;BOXWELL, DONALD A.;VAUSE, C. RANDE