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SHANG Erchang. AN APPROXIMATE FORMULA FOR THE WAVE REFLECTION FROM GRADUAL-TRANSITION ABSORBERSJ. ACTA ACUSTICA, 1965, 2(4): 192-197. DOI: 10.15949/j.cnki.0371-0025.1965.04.005
Citation: SHANG Erchang. AN APPROXIMATE FORMULA FOR THE WAVE REFLECTION FROM GRADUAL-TRANSITION ABSORBERSJ. ACTA ACUSTICA, 1965, 2(4): 192-197. DOI: 10.15949/j.cnki.0371-0025.1965.04.005
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AN APPROXIMATE FORMULA FOR THE WAVE REFLECTION FROM GRADUAL-TRANSITION ABSORBERS

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    • Abstract
  • The reflection factor of gradual-transition absorbers was discussed, the expression under W.K.B. approximation was derived and the formula of the reflection factor of a conical sound absorber was given. The results agreed roughly with experimental results. The approximate expression of the reflection factor was simple and convenient for absorber designs.
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