An Acoustic-Array Model for the Computation of the Rotational Noise of a Lifting Rotor

Abstract

A description is given of the development and corroboration of a simplified computational model for the prediction of the radiated rotational noise of a lifting rotor or propeller. The method is based on a solution of the concentrated force-excited wave equation and the identification of the terms in this solution with annular distributions of monopole sources of specified phase and amplitude. The computational algorithms developed from this mathematical model provide a rapid means for determining the amplitude and phase of the radiated sound field. They are particularly well suited for providing a description of rotor noise characteristics, which can be used as input to computer programs designed to calculate the rotor noise field in the presence of boundaries.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1971
Accession Number
AD0740816

Entities

People

  • John A. Macaluso

Organizations

  • Pennsylvania State University

Tags

DTIC Thesaurus Topics

  • Acoustic Arrays
  • Boundaries
  • Cartesian Coordinates
  • Computational Science
  • Computations
  • Computer Programs
  • Computers
  • Equations
  • Fourier Series
  • Free Field
  • Helicopter Rotors
  • Helicopters
  • Mach Number
  • Mathematical Models
  • Noise
  • Pressure Distribution
  • Sound Pressure

Fields of Study

  • Engineering
  • Physics

Readers

  • Aerospace Engineering
  • Computational Modeling and Simulation
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering