Modular bridge joints: reduction of noise emissions by use of Helmholtz Absorber

It was known that an environmental noise nuisance occurred as motor vehicle wheels passed over the joint but the mechanism for the generation of the noise nuisance was not previously known. Observation suggested that the noise generation mechanism involved possibly both parts of the bridge structure and the joint itself as it was unlikely that there was sufficient acoustic power in the simple tyre impact to explain the persistence of the noise in the surrounding environment. Engineering measurements and the analysis of these measurements indicated that an environmental noise nuisance resulted from the interaction of vibration of the modular bridge expansion joint with acoustic resonances produced within the void space of the abutment below the joint. A number of engineering methods of noise abatement were considered or investigated before a Helmholtz Absorber installation was adopted. Before and After noise measurement results show a significant decrease of low frequency noise due to the Helmholtz Absorber installation. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.


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  • Accession Number: 01011219
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 2:54PM