Items tagged with NOISE Files

File size: 2.23 MB Download

Inter-laboratory comparison of Nordtest test method for measurement of noise in working environment (NT TR 586)

NT TR 586

  • Nordtest Methods provided in 2002; NT ACOU 114 “Acoustics: Measurement of occupational noise exposure of workers – Survey method” and NT ACOU 115 “Acoustics: Measurement of occupational noise exposure of workers – Engineering method” were tested by making round robin tests in Nordic countries. The methods contain survey and engineering measurements that are based on short-term measurements and splitting up of the working day in work operations with similar noise levels.

File size: 344.79 KB Download

Measurement of drum sound (NT TR 573)

NT TR 573

  • The interest in the effect of background noise on our health and capacity for work has increased. One of the disturbing factors in office spaces, schools etc. is the drum sound, especially when the flooring consists of thin wood parquet or laminate. Drum sound is the noise that appears when an object, e.g. a foot, hits the flooring in the same room as the receiving ear.

File size: 2.14 MB Download

Road traffic - Vehicle noise emission (NT TR 557)

NT TR 557

  • A method for the determination of source parameters for estimation of road vehicle noise has been developed. The main parts of the method have been tested with measurements and this verifies that the method can be used in practice.

File size: 3.68 MB Download

Measurement of Drum Noise - A Pilot Project (NT TR 556)

NT TR 556

  • Drum noise from floors and floorings has been a building acoustics issue for many years although an international standardized measurement method has never been made.

File size: 533.32 KB Download

Determination of work place noise exposure - Consideration of measurements, calculations and uncertainty (NT TR 515)

NT TR 515

  • The aim of the present work is to prepare a Nordtest-method in two parts, namely a simple method for use to safety deputies, persons in industrial or occupational hygiene or in occupational health care etc., and a more advanced method requiring a great deal of competence in acoustics in order to achieve better accuracy in measurement results, if needed.

File size: 250.62 KB Download

Performance testing of active noise control (ANC) systems - Guideline (NT TR 487)

NT TR 487

  • This guideline describes a preliminary test method for performance testing of certain active Noise Control (ANC) systems. It sets out requirements for the measurement set-up and representation of the results. The work carried out so far is a first step towards a test method, and this preliminary method can be used as a guideline for testing ANC systems.

File size: 850.65 KB Download

Extended firing sheds and shooting blinds (NT TR 478)

NT TR 478

  • In the period 1996 to 1998 DELTA and the Danish Shooting Association investigated the influence of extended firing sheds and shooting blinds on the noise level in the surroundings. The reason for this was that all Danish shooting ranges had to comply with the noise limits in Guideline 1/1995 from the Danish Environmental Protection Agency, which increased the need for reducing the noise.

File size: 857.24 KB Download

Extended firing sheds and shooting blinds (NT TR 478 - Revised)

NT TR 478

  • In the period 1996 to 1998 DELTA and the Danish Shooting Association investigated the influence of extended firing sheds and shooting blinds on the noise level in the surroundings. The reason for this was that all Danish shooting ranges had to comply with the noise limits in Guideline 1/1995 from the Danish Environmental Protection Agency, which increased the need for reducing the noise.

File size: 1.20 MB Download

Measurement of Sound Pressure Levels at Low Frequencies in Rooms (NT TR 385)

NT TR 385

  • Comparison of available methods and standards with respect to microphone positions. Proposal for new procedures.

File size: 1.95 MB Download

Road vehicles: Determination of noise emission (NT ACOU 116)

NT ACOU 116

  • This method specifies how to determine the noise emission characteristics of road vehicles to obtain input data to be used in prediction methods for road traffic noise.

File size: 210.44 KB Download

Acoustics: Prominence of impulsive sounds and for adjustment of Laeq (NT ACOU 112)

NT ACOU 112

  • Noise with prominent impulses is more annoying than continuous types of noise (without impulses or tones) with the same equivalent sound pressure level. Therefore an adjustment KI is added to the measured LAeq, if prominent impulses are present in the noise, to adjust for the extra annoyance due to the impulses.

File size: 138.62 KB Download

Acoustics: Human sound perception – Guidelines for listening tests (NT ACOU 111)

NT ACOU 111

  • It is the intention of these guidelines to provide a tool to increase the effectiveness and reliability of listening tests.

File size: 574.58 KB Download

Acoustics: Assessment of annoyance caused by vibrations in dwellings from road and rail traffic by means of socio-vibrational and social surveys (NT ACOU 106)

NT ACOU 106

  • This Nordtest Method is a guide to the content, conduct, text file output describing the survey, procedures, sites and objective measures, and the data file output of sociovibrational and social surveys measuring annoyance due to vibrations in dwellings from road and rail traffic.

File size: 42.81 KB Download

Building elements - facade elements and facades: Field measurements of airborne sound insulation - Loudspeaker method using mls noise signals (NT ACOU 102)

NT ACOU 102

  • This NORDTEST method specifies a field method using a special kind of sound source signal, known as a “Maximum Length Sequence”.

File size: 121.90 KB Download

Radiator valves: Determination of the sound power level in the laboratory (NT ACOU 101)

NT ACOU 101

  • This Nordtest Method specifies a method of measuring in the laboratory, the noise emission (sound power level) from a radiator valve coupled to a specified reference radiator when a flow of water is forced through the valve at specified reference operating conditions.

File size: 93.13 KB Download

Machinery and equipment: Declared noise emission values based on the determination of the combined standard deviation (NT ACOU 100)

NT ACOU 100

  • This Nordtest method provides quidelines for determining the A-weighted declared single-number and dual-number noise emission values of machinery and equipment based on the determination of their spectrum or A- and C-weighted noise levels.

File size: 69.48 KB Download

Vibratory plate compactors: Noise test code (NT ACOU 087)

NT ACOU 087

  • This Nordtest method specifies operating conditions and methods to determine the sound power level and the emission sound pressure level at the work station of vibratory plate compactors. The results can be used to compare different vibratory plate compactors.

File size: 720.78 KB Download

Industrial plants: Noise emission (NT ACOU 080)

NT ACOU 080

  • This Nordtest engineering method specifies a method for measuring sound pressure levels at prescribed positions surrounding stationary noise sources at industrial plants and calculating the source strength based on the measured sound pressure levels.

File size: 70.69 KB Download

Rooms: Noise level (NT ACOU 042)

NT ACOU 042

  • This document specifies methods for measuring the A-weighted sound pressure level in rooms. The A-weighted sound pressure level is assumed to be due to noise from sources within the building. Guidelines for the correction of measurements made under one condition to values representative of other conditions are given in ANNEX A. ANNEX A is not an integral part of this method.

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