Experimental investigation of nonlinear acoustic properties for perforates
2006 (English)In: Collection of Technical Papers: 12th AIAA/CEAS Aeroacoustics Conference, Cambridge, MA, 2006, Vol. 1, 67-74 p.Conference paper (Refereed)
This paper presents the results of a study of non-linear acoustic properties of perforates and micro-perforates. The results are potentially of interest for perforates and other facing sheets used in aircraft engine liners as well as perforate pipes used in automotive mufflers. In the linear limit the perforate acoustic impedance is independent of the sound field but when the sound pressure level is high it will be dependent on the acoustic particle velocity in the holes. For pure tone excitation the impedance will be controlled by the acoustic particle velocity at that frequency. If the acoustic excitation is random or periodic with multiple harmonics the impedance at a certain frequency will depend on the particle velocity at other frequencies. In this paper a study lias been made of harmonic interaction effects by using multiple pure tone excitation and random noise excitation.
Place, publisher, year, edition, pages
Cambridge, MA, 2006. Vol. 1, 67-74 p.
, 12th AIAA/CEAS Aeroacoustics Conference
Acoustic excitation, Acoustic particle velocity, Facing sheets, Random noise excitation, Acoustic impedance, Acoustic properties, Aircraft engines, Automobile mufflers, Perforators
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-61820ScopusID: 2-s2.0-33845784238ISBN: 1563478099ISBN: 9781563478093OAI: oai:DiVA.org:kth-61820DiVA: diva2:479703
12th AIAA/CEAS Aeroacoustics Conference
QC 201203082012-01-182012-01-182012-03-08Bibliographically approved