Analysis of the effects of uneven sound coverage over a facade during a sound insulation test according to the international standard ISO 16283-3 (original) (raw)
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Accreditation and Quality Assurance, 2015
The ISO 140-5:1998 standard specifies the testing methods to evalúate the sound insulation in buildings and building elements for facades. Three rounds of a proficiency testing scheme for airborne sound insulation measurements have been performed according to the methods specified in the standard for a whole facade by using an external loudspeaker as the noise source. The adequacy of the intercomparison is guaranteed by means of the assessment of global precisión criteria in compliance with the scope stipulated by the normative references in order to determine the reproducibility limits in a regulated measurement method. To evalúate the participant performance, the corresponding combined scores as composite indexes are calculated, so if this assessment is performed along a certain number of rounds, it will remark the participants that show an overall satisfactory performance by monitoring their achievement over time. Therefore, in order to establish a reference valué in terms of precisión level, an approach based on the development of a collaborative test in controlled conditions is proposed. The goal is to provide reliable and updated criteria for the evaluation of repeatability and reproducibility limits in this field, particularly in those scopes in which nowadays there is no normative reference or this is very poor. Furthermore, these prescribed valúes of precisión should be verified regularly, as well as the definition of practical conditions of application.
Noise Control Engineering Journal
The international standard ISO 140-5 for the measurement of the sound insulation of building façades will be replaced by the new standard ISO 16283-3 soon. Together with solving a few limits of the existing standard, the review is going to introduce the procedures for measurements at low frequencies. This paper investigates the uncertainties related to the position of the instruments in sound insulation measurements of building façades. The positions proposed by the international standard ISO 140-5 are compared with those proposed in other standards and with the draft standard prISO 16283-3. The limits of measurement of the sound pressure level in front of the façade are investigated by comparing different placements both of the external source and the receiver. This shows that the average among different measurements is necessary in order to reduce the effect of interferences. The average of the sound pressure levels in different microphone positions is easier than the average obtained by movements of the loudspeaker. Later, different placements of the receiver inside the rooms are compared. In particular, corner and center room positions are assessed and their energy-average values according to the ISO 16283-1 are considered. Finally, the uncertainties related to equipment positions are discussed and suggestions to improve the future ISO 16283-3 are reported.
COPY NO._1_ ASSESSMENT OF SOUND INSULATION TREATMENTS
This research funded by the Airport Cooperative Research Program of the National Academy of Science is in response to a concern as to whether the acoustic performance achieved in early airport sound insulation programs has met the test of time and still provides the same protection as when it was first introduced. Although no exhaustive studies have been performed, there have been reports that the acoustical performance of treatments applied in early programs might have deteriorated over time. Accordingly, the objectives of the research were as follows: The objectives of Airport Cooperative Research Program (ACRP) Project 02-31 are as follows: 1. Identify and evaluate the degree and causes of deterioration, and what changes have been made in current programs that reduce the likelihood of deterioration, and 2. Predict the performance of current procedures and provide guidance to help airports determine the expectation of the durability and performance of current sound insulation techniques, treatment and materials. The project consisted of ten tasks conducted in two phases. In Phase I, a literature search was conducted to develop the chronology of airport sound insulation programs and provide leads to the identification of sources of data. The plan was to use the chronology to identify changes in methods and procedures from early to current programs, and relate these changes to possible degradation in acoustic performance. This effort followed with actual acoustical testing and architectural evaluations of representative sample of dwelling units that were insulated in the early years. The results from the tests conducted at two sound insulation program sites showed that there has been less deterioration in performance over the years than expected. This is consistent with the lack of reported deterioration in performance obtained from the survey of US programs. In most cases, any deterioration in performance is more likely to be the result of homeowner modifications, poor maintenance, extreme weathering, and in some cases poor installation, and generally not due to deterioration in the products themselves. This does not imply that there have been no problems with products or installation procedures. Many programs have reported such issues, but to a large extent, these have been identified by the program sponsors (or their consultants) and corrected by the product manufacturers or contractors. The lessons learned along the way have led to changes in products, installation, and quality control procedures that have reduced the frequency of such problems. In Phase II, the longevity of acoustic treatments was assessed, and guidance material prepared to assist program sponsors in ensuring long-term noise reduction effectiveness. This guidance material is published as a separate, stand-alone document.
This paper presents the results of a research study undertaken as part of two Short Term Scientific Missions (STSM) of European COST Action TU0901, carried out at the Construction Technologies Institute ITC CNR of Milan with the aim to review, analyse and interpret substantial field data relating to the façade sound insulation. The host institution ITC has collected a database that can be considered unique of its kind taking into account that on-site façade sound insulation measurements are less frequent and more complicated than interior walls sound insulation measurements. To collect data for this database the many prominent Bodies have cooperated with ITC and provided its own data in the context of the STSM work. This paper focuses on the analysis of the influence of acoustic and non-acoustic parameters on the insulation performance of façades; the different building intended use, the typology of the façade, the layers and mass of the wall, the portion of window surface and their...
The international standard ISO 140-5 for the measurement of the sound insulation of building façades will soon be replaced by the new standard ISO 16283-3. This revision includes the procedures for measurements at low frequencies down to 50 Hz. The uncertainty of façade sound insulation, in particular at low frequencies, was evaluated by a Round Robin Test, conducted in a full-scale experimental building at ITC-CNR. Each of the 10 teams involved in the RRT replicated the tests 5 times, for a total of 50 measurements. The different
Building and Environment, 2016
The international standard ISO 140-5 for the measurement of the sound insulation of building facades has been recently replaced by the new standard ISO 16283-3. The revised standard includes the procedure for measurements at low frequencies down to 50 Hz. The uncertainty of facade sound insulation, in particular at low frequencies, was evaluated by a Round Robin Test, conducted in a full-scale experimental building at the Construction Technologies Institute of the National Research Council of Italy (ITC-CNR). Each of the 10 teams involved in the RRT replicated the tests 5 times, for a total of 50 measurements. The different measurement positions inside the receiving room were compared. In particular, all the teams involved in the RRT followed the low-frequency procedure, assessing corner and center room positions; the energy average values according to ISO 16283-3 were considered and the relative uncertainty, in terms of repeatability and in situ reproducibility standard deviations, was compared with the ones measured and calculated following the default measurement procedure. It was found that the uncertainty of the low-frequency procedure is higher than that of the default procedure. This would suggest the need to investigate further the reliability of the low-frequency procedure. At high frequency, the significant uncertainty values found are probably caused by the loudspeakers directivity and position; this aspect need to be investigated in greater detail, as well.
The international standard ISO 16283-3: 2016 provides procedures to determine the airborne sound insulation of building facades, both for whole facades (global methods) and for facade elements (element methods), such as for doors, windows, etc. In both cases, the standard offers the possibility of using environmental noise as the sound source (road traffic noise, railway noise and aircraft noise) or, alternatively, a loudspeaker that emits broadband noise as an artificial sound source. When using an artificial sound source, the loudspeaker directivity requirements have been established to ensure uniform sound coverage across the facade area. This work analyzes the distribution of sound pressure level on the facades for the types of loudspeakers most commonly used in acoustic testing from a statistical point of view. This study has been carried out for both free field conditions, which is the condition specified for the qualification of loudspeaker directivity by the international standard, and actual conditions (i.e., "in situ" measurements). The purpose of the study is to determine the extent the speaker directivity requirement of the ISO 16283-3 standard guarantees correct sound coverage of facades under "in situ" measurement conditions. Finally, practical conclusions on loudspeaker choice have been derived, based on the behavior of the different types of loudspeakers applied to this type of measurement.