bibo:abstract
  • The reflection coefficient of a material at oblique incidence is measured in a free field. The sound pressure distributions are measured at discrete points on two measurement lines and then decomposed into plane wave components by using spatial Fourier transform. The inciedent and reflected plane wave components are obtained from a set of "decomposition equations" of which uses the plane wave propagation theory. Numerical simulations and experiments have been performed to see the effect of finite size of measurement area. To reduce this effect, a window fuction has been performed to see the effect of finite size of mesurement area. To reduce this effect, a window function has been proposed and its effect on the measurement of sound absorbing material property has been studied as well. The reflection coefficient obtained by this method is compared with those obtained from other methods ; 2-microphone method in a duct and an expirical equation of which determines the characteristic impedance pc and propagation constant k of a material from flow resistance information. (rdf:langString) (en)
nlon:biographicalNote
  • 김상렬, 한국과학기술원 기계공학과 (xsd:string)
  • 김양한, 정회원, 한국과학기술원 기계공학과 (xsd:string)
  • 이수열, 대우자동차(주) 기술연구소 (xsd:string)
nlon:classificationNumberOfNLK
  • 539.9505 (xsd:string)
nlon:containedIn
dc:creator
  • 김상렬 (xsd:string)
  • 김양한 (xsd:string)
  • 이수열 (xsd:string)
dcterms:creator
nlon:datePublished
  • 2021-01-30T23:37:12 (xsd:dateTime)
dcterms:description
  • Measurement of reflection coefficient of sound absorbent material with respect to angle of incidence and its associated errors (xsd:string)
bibframe:extent
  • 28 cm (xsd:string)
  • p. 295-305 (xsd:string)
dcterms:isPartOf
nlon:issuedYear
  • 1994 (xsd:string)
nlon:itemNumberOfNLK
  • 한537ㅅ (xsd:string)
rdfs:label
  • 입사각에 따른 흡음재의 반사 계수 측정 방법론 및 오차에 대한 고찰 / 이수열, 김상렬,김양한 (xsd:string)
dcterms:language
dc:subject
  • Angle of incidence (xsd:string)
  • Measurement of reflection coefficient (xsd:string)
  • Sound absorbent material (xsd:string)
  • 반사 계수 측정 방법론 (xsd:string)
  • 입사각 (xsd:string)
  • 흡음재 (xsd:string)
dcterms:title
  • 입사각에 따른 흡음재의 반사 계수 측정 방법론 및 오차에 대한 고찰 (xsd:string)
rdf:type
nlon:volumeOfNLK
  • 4(1) (xsd:string)