Equivalent Values of Traffic, Aircraft and Industrial Noise.

Abstract

Equivalent values of traffic, aircraft and industrial noise, as rated by the separate indices L sub 10 (18 hour), Noise and Number Index (NNI), and Corrected Noise Level (CNL) respectively, are derived by a translation method which uses L sub eq and L sub NP as intermediate measures. The value of NNI numerically equivalent to a particular value of L sub 10 as derived by the L sub eq translation differs by approximately 10 units from that derived by the L sub NP translation. The origins of this numerical difference are outlined and the implications discussed. Evidence is presented which suggests that L sub NP is the more appropriate measure to use in equating levels of separate indices in terms of acceptability. The result of the translation from L sub 10 to NNI using L sub NP confirms the implied equivalence between the traffic and aircraft noise criteria recommended in the Department of the Environment Circular 10/73, 'Planning and Noise', within the tolerance imposed by the limitations of the respective descriptors. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
ADA085009

Entities

People

  • B. F. Berry

Organizations

  • National Physical Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Aircraft Noise
  • Aircrafts
  • Background Noise
  • Cargo Aircraft
  • Computer Programs
  • Flight
  • Flight Paths
  • Human Factors Engineering
  • Industrial Noise
  • Internal Combustion Engines
  • Measurement
  • Noise
  • Standards
  • Transport Aircraft
  • Turbofan Engines
  • Urban Areas

Readers

  • Acoustics.
  • Aviation Safety and Air Traffic Management
  • Calculus or Mathematical Analysis