A Study on the Insertion Loss of Noise Barrier with the Variation of Top Shape

방음벽 상단부 형상에 따른 삽입손실 연구

  • 정성수 (한국표준과학연구원 음향진동그룹) ;
  • 김용태 (한국표준과학연구원 음향진동그룹) ;
  • 이우섭 (아산정보기능대학 멀티미디어과)
  • Published : 2002.10.01

Abstract

The insertion loss of the noise barriers with several top shape is measured in an anechoic room by using a reduced scale model test. The insertion loss differences between a straight vertical barrier having 0.3 m height and several barriers with simple top shaped are compared. The results show that the latter is more effective than the former and absorptive barrier is more effective than the reflective one. Among the barrier types of 'T', 'Y', and '(equation omitted)', type 'Y' is the best one and the rest have similar effect. This result is well agree with Alfredson (PIOC. Inter-Noise 95, p. 381, 1995)'s but contradict to May (J. Sound Vb. 71, p. 73, 1980)'s. Therefore, it is difficult to determine which type is the best. In order to find out this discrepancy, boundary element method is adopted and the result shows one can have different result because each supposed different experimental conditions like height of noise barrier, positions of sound source and receiver, etc.

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