Acoustic Signature Measurements and Modelling of sUAS Vehicles

Abstract

An extensive wind tunnel test campaign has been conducted to investigate the acoustic emissions of small unmanned aerial systems. An L26H propeller was tested with and without two upstream wing configurations to determine the effect inflow disturbance has on acoustic emissions. A range of propeller revolution rates, wind tunnel speeds, and yaw angles were investigated, and a subset of the results are documented here. Also documented is an acoustic detection calculation method that was used to determine the effect inflow disturbance on the propeller system has on acoustic detection of UAS vehicles. The data clearly proves that full vehicle aerodynamics are required to predict acoustic detection metrics for UAS vehicles, as upstream bodies provide a tactically significant increase in acoustic emissions of the vehicle.

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Document Details

Document Type
Technical Report
Publication Date
Apr 30, 2021
Accession Number
AD1152142

Entities

People

  • James H. Stephenson

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Detection
  • Acoustic Emissions
  • Acoustic Measurement
  • Acoustic Waves
  • Acoustics
  • Aircrafts
  • Anechoic Chambers
  • Atmospheric Attenuation
  • Atmospheric Motion
  • Detection
  • Engineers
  • Equations
  • Frequency
  • Human Factors Engineering
  • Measurement
  • Rotary Wing Aircraft
  • Temperature Gradients
  • Test Facilities
  • United States
  • Unmanned Aerial Systems
  • Unmanned Aerial Vehicles
  • Vehicles
  • Wind
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Marine Hydrodynamics
  • Sensor Fusion and Tracking Systems.

Technology Areas

  • Autonomy