ACOUSTIC NOISE SUPPRESSING DUCTED FAN PROPULSOR MOUNTING ARRANGEMENT AND TREATMENTS

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ACOUSTIC NOISE SUPPRESSING DUCTED FAN PROPULSOR MOUNTING ARRANGEMENT AND TREATMENTS

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BARRETT RONALD MARTIN / SCHUMACHER LAUREN NICOLE / MCNAMEE PATRICK IAN / HAUG JOHN AUSTIN / MUDD JOSHUA DONALD / PRINS DALTON BASTIAAN / WERNER NICHOLAS DONALD

Abstract

A general mounting method for ducted fan propulsors is disclosed. This mounting method uses extremely slender stators that connect the duct ring to the propulsor which is mounted in the middle and drives the rotor, fan or propeller. The slender stators take the form of spokes and as such are so slender that the midspan stresses within the spokes are dominated by axial tension loads rather than the shear loads experienced by conventional stators. The spokes may have an aerodynamic shape and damping methods may be used to retard spoke vibrations and transmission of engine vibrations to the duct and force. The duct itself is also stiffened by the spoke arrangement, thereby reducing low frequency vibration modes.

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Title :

ACOUSTIC NOISE SUPPRESSING DUCTED FAN PROPULSOR MOUNTING ARRANGEMENT AND TREATMENTS

Contributors:

BARRETT RONALD MARTIN (author) / SCHUMACHER LAUREN NICOLE (author) / MCNAMEE PATRICK IAN (author) / HAUG JOHN AUSTIN (author) / MUDD JOSHUA DONALD (author) / PRINS DALTON BASTIAAN (author) / WERNER NICHOLAS DONALD (author)

Publication date :

2021-04-15

Type of media :

Patent

Type of material :

Electronic Resource

Language :

English

Classification :

IPC:

B64C AEROPLANES , Flugzeuge / F01D Strömungsmaschinen [Kraft- und Arbeitsmaschinen oder Kraftmaschinen], z.B. Dampfturbinen , NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES