Items tagged with ACOUSTICS Files

File size: 1.39 MB Download

Acoustic design of open-plan offices (NT TR 619)

NT TR 619

  • This application could serve as a practical tool for the acoustic planning of open-plan offices. The acoustic conditions in open-plan offices were investigated in a Nordic cooperation project. Measurements were carried out in five open-plan offices along with a questionnaire to gather the staff’s subjective judgments. A programme for the acoustic measurements was drawn up, specifying how to perform the measurements and which type of parameters to measure.

File size: 2.57 MB Download

Sound scattering in rooms with ceiling treatment (NT TR 606)

NT TR 606

  • The objective in this project is to present a method for quantifying the diffusing effect of furniture and other equipment in rooms with ceiling treatment. The presence of furniture and equipment in this type of rooms will influence room acoustical parameters such as reverberation time, speech transmission index and sound pressure levels among others. A measure denoted equivalent scattering absorption area is introduced.

File size: 3.64 MB Download

Reproducibility of measurements with ISO 140 and calculations with EN 12354 (NT TR 603)

NT TR 603

  • Uncertainties of measurement and prediction of the sound insulation in a building is an important issue to the building industry, because they put increased expenses on all actors of the building process who have to keep safety margins to prescribed requirements. This report deals with estimates of both types of uncertainty and some recommendations on suitable safety margins are given.

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: 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: 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: 166.17 KB Download

Measurement of occupational noise exposure of workers: Part ii: engineering method (NT ACOU 115)

NT ACOU 115

  • This Nordtest method specifies an engineering method for determination of occupational noise exposure at work places. The method contains different approaches for carrying out the measurements.

File size: 102.68 KB Download

Measurement of occupational noise eaxposure of workers: Part i: survey method (NT ACOU 114)

NT ACOU 114

  • This Nordtest Method specifies survey methods for determination of occupational noise exposure at work places.

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: 80.81 KB Download

Acoustics: Human sound perception – measurement positions for measurement of loudness (NT ACOU 110)

NT ACOU 110

  • The traditional physical descriptor, the A-weighted sound pressure level, LPA, is often not an adequate objective descriptor for perceived sound.

File size: 264.85 KB Download

Air terminal devices: Acoustic transmission loss (NT ACOU 105)

NT ACOU 105

  • The method describes a test arrangement and procedure for measuring transmission loss without flow of duct-mounted air terminal devices. This is a laboratory substitution method, which is to be applied in a reverberation room.

File size: 145.11 KB Download

Road traffic: Measurement of noise immission – survey method (NT ACOU 056)

NT ACOU 056

  • This Nordtest method states procedures for measuring road traffic noise inside and outside buildings and in open terrain, under specified traffic and environmental conditions, at distances up to 100 m from the road.

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.

File size: 422.85 KB Download

Road traffic: Measurement of noise immission - Engineering method (NT ACOU 039)

NT ACOU 039

  • This NORDTEST method states procedures for measuring road traffic noise inside and outside buildings and in open terrain, under specified traffic and environmental conditions.

File size: 72.28 KB Download

Noise absorber pads: Sound absorption (NT ACOU 038)

NT ACOU 038

  • This NORDTEST method contains supplementary specifications to the measurement procedure stated in ISO/R 354-1963 (E) with regard to measurements on discrete sound absorbers, like noise absorber pads.

File size: 253.16 KB Download

Small building elements: sound insulation (NT ACOU 037 withdrawn)

NT ACOU 037

  • This document specifies a laboratory NORDTEST method of measuring airborne sound insulation of such small building elements as are defined under clause 2. The document also establishes directions about reporting and applying such test data.

    The results obtained may be used to develop building elements with approbiate acoustical proprties, to classify such elements according to their sound insulation properties and to etimate their influence on the sound insulation of partition constructions in buildings.

Nordtest

Nordtest is a trademark of Nordic cooperation in conformity assessment. The emphasis of Nordtest is to develop, promote and innovate Nordic test methods and pre-normative activity. Nordtest endeavours to remove technical barriers to trade and promotes the concept: “Approved once, accepted everywhere”.