A time-domain implementation of surface acoustic impedance condition with and without flow

Yusuf Özyörük, Lyle Norman Long

Research output: Contribution to conferencePaper

32 Citations (Scopus)

Abstract

The impedance condition in computational aeroacoustic applications is required in order to model acoustically treated walls. The application of this condition in time-domain methods, however, is extremely difficult because of the convolutions involved. In this paper, a timedomain method is developed which overcomes the computational difficulties associated with these convolutions. This method builds on the z-transform from control and signal processing theory and the z-domain model of the impedance. The idea of using the z-domain operations originates from the computational electromagnetics community. When the impedance is expressed in the zdomain with a rational function, the inverse z-transform of the impedance condition results in only infinite impulse response type, digital, recursive filter operations. These operations, unlike convolutions, require only limited past-time knowledge of the acoustic pressures and velocities on the surface. One- and two-dimensional example problems with and without flow indicate that the method promises success for aeroacoustic applications.

Original languageEnglish (US)
DOIs
StatePublished - Jan 1 1996
Event2nd AIAA/CEAS Aeroacoustics Conference, 1996 - State College, United States
Duration: May 6 1996May 8 1996

Other

Other2nd AIAA/CEAS Aeroacoustics Conference, 1996
CountryUnited States
CityState College
Period5/6/965/8/96

Fingerprint

Acoustic impedance
Convolution
Computational aeroacoustics
Computational electromagnetics
Aeroacoustics
Inverse transforms
Rational functions
Impulse response
Signal processing
Acoustics
Mathematical transformations

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Aerospace Engineering

Cite this

Özyörük, Y., & Long, L. N. (1996). A time-domain implementation of surface acoustic impedance condition with and without flow. Paper presented at 2nd AIAA/CEAS Aeroacoustics Conference, 1996, State College, United States. https://doi.org/10.2514/6.1996-1663
Özyörük, Yusuf ; Long, Lyle Norman. / A time-domain implementation of surface acoustic impedance condition with and without flow. Paper presented at 2nd AIAA/CEAS Aeroacoustics Conference, 1996, State College, United States.
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Özyörük, Y & Long, LN 1996, 'A time-domain implementation of surface acoustic impedance condition with and without flow' Paper presented at 2nd AIAA/CEAS Aeroacoustics Conference, 1996, State College, United States, 5/6/96 - 5/8/96, . https://doi.org/10.2514/6.1996-1663

A time-domain implementation of surface acoustic impedance condition with and without flow. / Özyörük, Yusuf; Long, Lyle Norman.

1996. Paper presented at 2nd AIAA/CEAS Aeroacoustics Conference, 1996, State College, United States.

Research output: Contribution to conferencePaper

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Özyörük Y, Long LN. A time-domain implementation of surface acoustic impedance condition with and without flow. 1996. Paper presented at 2nd AIAA/CEAS Aeroacoustics Conference, 1996, State College, United States. https://doi.org/10.2514/6.1996-1663