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Area of Science:

  • Acoustics
  • Computational Physics
  • Numerical Simulation

Background:

  • Standard numerical sound field simulations struggle with unsteady and non-uniform ambient conditions like wind flow.
  • Previous work demonstrated an adjoint-based approach for synthesizing sound sources under such conditions.

Purpose of the Study:

  • To prove that realistic sound sources with complex directivity can be synthesized using the adjoint-based method.
  • To analyze the monopole requirements for accurate source synthesis.
  • To highlight the method's advantages for predicting sound reinforcement systems.

Main Methods:

  • Adjoint-based approach utilizing discrete, grid-based monopoles.
  • Finite-difference time-domain (FDTD) simulations.
  • Modeling of an oscillating circular piston and a two-way near-field monitor.

Main Results:

  • The adjoint-based method successfully synthesizes complex sound sources, including those with realistic directivity.
  • The number of monopoles required correlates with the deviation in sound pressure level between the original and synthesized source.
  • Computational effort remains independent of the number of monopoles used.

Conclusions:

  • The adjoint-based method is effective for synthesizing complex sound sources with realistic directivity.
  • The method's computational efficiency makes it suitable for predicting sound reinforcement systems under adverse acoustic conditions.