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Noise measurement and standardization of this process

Updated: Jul 4, 2021

As more and more attention is paid to the influence of various aspects of everyday life on human health, the number of regulatory legal documents for each category is increasing. To analyze the influence of noise, entire laboratories and research centers are being created, which allow, in the course of development, to significantly improve the quality of the equipment produced, as well as to offer new technologies with less negative impact on human health. To regulate measuring processes and organize the working atmosphere, international standards are being created, with the main ones in this industry we will introduce you today.

Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:2020)

EN ISO 11691:2020

Laboratory research has a large number of possible risks, as well as technical parameters and features that affect the outcome of the activity. That is why adherence to standards such as EN ISO 11691: 2020 provides the highest quality result.

This document specifies a laboratory substitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangular silencers, as well as other duct elements for use in ventilating and air-conditioning systems.

NOTE Laboratory measurement procedures for ducted silencers with superimposed flow are described in ISO 7235[5].

This document is applicable to silencers where the design velocity does not exceed 15 m/s. As the method does not include self-generated flow noise, this document is not suitable for tests on silencers where this type of noise is of great importance for the evaluation of the silencer performance. As most silencers, particularly in offices and dwelling, have design velocities below 15 m/s, this document can often be a cost-efficient alternative to ISO 7235.

The insertion loss determined according to this document in a laboratory is not necessarily the same as the insertion loss obtained in an installation in the field. Different sound and flow fields in the duct yield different results. In this document, the sound field is dominated by plane wave modes. Due to the use of regular test ducts, the results can include some flanking transmission via structural vibrations in the duct walls that sets an upper limit to the insertion loss that can be determined.

Since this document is quite specialized, we recommend purchasing it if your field of activity clearly corresponds to the above parameters.

Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 1: Noise control strategies (ISO 11690-1:2020)

EN ISO 11690-1:2020

The workplace should be not only comfortable but also safe. That is why any employer must first of all take care of the observance of all measures to preserve the health of the worker. When it comes to the influence of sounds and noise suppression devices, it is necessary to adhere to the recommendations specified in the standard EN ISO 11690-1: 2020.

This document outlines strategies to be used in dealing with noise problems in existing and planned workplaces by describing basic concepts in noise control (noise reduction, noise emission, noise immission and noise exposure). It is applicable to all types of workplaces and all types of sources of sound which are met in workplaces, including human activities. It includes those important strategies to adopt when buying a new machine or equipment.

If your organization plans to go international and also cares about the condition of its employees, we recommend that you have the aforementioned document without fail.

Acoustics - Determination and application of measurement uncertainties in building acoustics - Part 1: Sound insulation (ISO 12999-1:2020)

EN ISO 12999-1:2020

In any professional activity, the application of international standards implies taking into account all technical parameters in order to achieve the most productive results. In the field of construction, one of the most significant regulatory documents is EN ISO 12999-1: 2020.

This document specifies procedures for assessing the measurement uncertainty of sound insulation in building acoustics. It provides for

— a detailed uncertainty assessment;

— a determination of uncertainties by inter-laboratory tests;

— an application of uncertainties.

Furthermore, typical uncertainties are given for quantities determined according to ISO 10140 (all parts), ISO 16283 (all parts) and ISO 717 (all parts).

Since the very description of this international standard indicates the possibility of using similar documents, it is necessary to clarify the specific requirements and expectations from the application of the international standard. If you have questions about which document may be useful for you, you can contact a team of specialists in the field of international standardization selection to avoid mistakes in application and purchase the wrong document.

Acoustics - Rating of sound insulation in buildings and of building elements - Part 2: Impact sound insulation (ISO 717-2:2020)

EN ISO 717-2:2020

Sometimes, sound waves emitted by electrical appliances and other objects can make adjustments to the activities planned by the organization and negatively affect existing processes. If you pay great attention to safety issues and minimization of possible risks in construction activities, we recommend that you pay attention to the EN ISO 717-2: 2020 standard.

This document

a) defines single-number quantities for impact sound insulation in buildings and of floors,

b) gives rules for determining these quantities from the results of measurements carried out in

one-third-octave bands in accordance with ISO 10140-3 and ISO 16283-2, and in octave bands in

accordance with that option in ISO 16283-2 for field measurements only,

c) defines single-number quantities for the impact sound reduction of floor coverings and floating

floors calculated from the results of measurements carried out in accordance with ISO 10140-3, and

d) specifies a procedure for evaluating the weighted reduction in impact sound pressure level by floor coverings on lightweight floors.

The single-number quantities in accordance with this document are intended for rating impact sound insulation and for simplifying the formulation of acoustical requirements in building codes. An additional single-number evaluation in steps of 0,1 dB is indicated where it is needed for the expression of uncertainty (except for spectrum adaptation terms). Numerical values of the single-number quantities are specified where required for calculations.

Since the standards have a large number of clarifying technical parameters to avoid errors and its incorrect use, we recommend checking them with the technological base of your organization or business before making a decision to purchase this document.

Acoustic devices and the need for their standardization

This area has a large number of technical parameters that can significantly affect which document needs to be purchased to increase the productivity of the existing system. Since international standards are increasingly becoming not just a recommendation, but a necessity, their application should be planned taking into account all the technical characteristics of your field of activity. To avoid mistakes of introducing an incorrect document, you can consult with a team of specialists in the field of international standardization, who will advise you on which document can give an impetus to the development of your business at a higher level while structuring the existing system.



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