DEALING WITH TECHNOLOGY'S MORE NOISY ADVANCES

The authors discuss the increasing noise problem associated with present day technology and the methods that are being used to measure noise level. They first deal with noise from high-speed electric passenger express trains with particular reference to the proposed (but shelved) channel tunnel rail link, the Japanese adaptations of the NNI concept and the attitude in France. It is pointed out that the proposed ctrl noise level of 67db(a) leq corresponded to a facade peak level of about 83db(a). Low-speed rail terminal noise generation is discussed, which would go on by night as well as day and, because the background noise is less, would have a more disturbing effect. Extension of the leq scale is discussed and the American proposals for the ldn index which takes account of the time of day. Good agreement is demonstrated between the estimated facade ldn level of 72db(a) and the leq of 67db(a) suggested for high-speed railways. It is suggested that compensation should be considered if construction and demolition noise continued at a high level for more than two working months in succession. Helicopter generated noise is examined. The complex nature of this noise is investigated, and the advantages of straightforward peak db(a) noise measurement are pointed out. Measured noise levels are discussed in relation to doe recommendations for limiting housing development. The authors conclude that the simplicity of the versatile leq db(a) noise measuring approach will assist the noise control engineer in his problems. /TRRL/

  • Availability:
  • Corporate Authors:

    Municipal Engineering Publications, Limited

    178-202 Portland Street
    London W1N 6NH,   England 
  • Authors:
    • De S Deva-Aditya, N J
    • HILL, C
  • Publication Date: 1975-3-14

Media Info

  • Features: Tables;
  • Pagination: p. 523-524
  • Serial:
    • Municipal Engineering
    • Volume: 152
    • Issue Number: 11
    • Publisher: Municipal Engineering Publications, Limited
    • ISSN: 0263-788X

Subject/Index Terms

Filing Info

  • Accession Number: 00127902
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1975 12:00AM