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Noise Analysis of Uav Propeller

By Department of Defense

Description
Government Reference Publication

Excerpt
Excerpt: Aerodynamic Design Design Conditions Questions and some answers from a phone call 11/15/01 with Vince Castelli (CastelliVJIntroduction: nswccd.navy.mil). I added more questions later. Q: Is there more detail on the centerbody shape? Q: Is the propeller operating in a body wake, wing downwash, or angle of attack? No, tractor configuration and assume that it is operating at cruise with the axis aligned with the inflow (there still could be some inflow distortion). Q; What is the noise measurement condition (flyover altitude, rpm, etc.) ? 100 ft at the peak radiation angle. Q: What is the reference noise level of the existing propellers? Approximately 65 dBA ... 70 dBA at 100 ft. Q: Is the specified 12dB reduction over 5500-9000 rpm a reduction at the peak rpm, or a reduction for all rpm’s in that range? Q: Is a system view allowed, or is this a propeller only approach? If a system view is allowed, Is a gearbox allowable as part of the solution? Can the vehicle be changed to reduce the unsteady flowfield or unsteady loads (AOA) seen by the propeller? Assume that you cannot change the rpm range (i.e. no gearbox changes). Also assume that you can align the propeller axis with the inflow.

Table of Contents
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Book Id: WPLBN0000206193
Format Type: PDF eBook
File Size: 340,748 K.B.
Reproduction Date: 2005
Full Text


Title: Noise Analysis of Uav Propeller  
Author: Department of Defense
Volume:
Language: English
Subject: Military, Armed Forces., National defense.
Collection: Military and Armed Forces Library Collection
Subcollection:
Historic
Publication Date:
Publisher: Department of Defense

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