scholarly journals Evaluation Method for Façade Acoustic Insulation for a Corner Room: Discussion on the Results Obtained as a Function of the Source Position

2020 ◽  
Vol 10 (21) ◽  
pp. 7434
Author(s):  
Nicola Granzotto ◽  
Edoardo Alessio Piana
Keyword(s):  
Sound Source ◽  
Evaluation Method ◽  
International Standards ◽  
Sound Insulation ◽  
Source Position ◽  
Noise Levels ◽  
Acoustic Attenuation ◽  
Acoustic Insulation ◽  
Building Facades ◽  
The Individual

The appropriate acoustic insulation project of building façades is of importance for the design of highly comfortable living environments. In some countries, national regulations require maximum noise levels inside rooms, or minimum sound insulation limits, to be respected. The acoustic insulation design of a façade is usually performed according to the ISO 12354-3 standard, which presents a calculation method based on the geometry of the room, the shape of the façade, the areas and the acoustic performances of the individual elements. The prescribed limits must be experimentally verified according to methods derived from international standards. However, the current versions of such standards do not provide details on how to perform the measurements and the calculation of the sound insulation for corner rooms. An important remark is that, depending on the position of the sound source used for the measurements, different results of the standardized sound insulation are obtained. This article proposes a new method for calculating the façade insulation of corner rooms by introducing the acoustic attenuation due to the diffraction of the corner and the distance of the sound source from the façades, estimated through simulations and experimentally validated.

SOUND INSULATION OF A MECHANICAL WORKSHOP

2014 ◽  
Vol 4 (2) ◽  
Author(s):  
ZORAN PETROVIĆ ◽  
BRANKO RADIČEVIĆ ◽  
MILAN KOLAREVIĆ ◽  
VLADAN GRKOVIĆ
Keyword(s):  
Theoretical Model ◽  
Key Words ◽  
Design Process ◽  
Experimental Results ◽  
Sound Insulation ◽  
Housing Estate ◽  
Noise Levels ◽  
Acoustic Insulation

The paper presents a design process related to sound insulation of a small mechanical workshop for storing eccentric presses, which is located in a densely populated housing estate. Starting from the theoretical model of acoustic insulation power of a single solid partition, a complex partition and a multi-layer partition, the acoustic insulation power of the walls and the ceiling in the workshop was determined. The results of calculation of workshop isolation coincide to a great extent with the experimental results of measuring noise levels. Key words: noise, mechanical workshop, sound insulation

scholarly journals CRITICAL REVIEW OF METHODS FOR EVALUATING ACOUSTIC CHARACTERISTICS OR PREMISES

2020 ◽  
Vol 17 (2) ◽  
pp. 274-285
Author(s):  
R. S. Fediuk ◽  
A. V. Baranov ◽  
R. A. Timokhin
Keyword(s):  
Building Materials ◽  
Low Frequency ◽  
International Standards ◽  
Sound Insulation ◽  
Noise Sources ◽  
Acoustic Characteristics ◽  
Acoustic Insulation ◽  
Sound Reflection ◽  
Reflecting Surface ◽  
Building Standards

Introduction: The development of effective structural materials with improved acoustic characteristics is relevant for the modern construction industry. Considering the variety of international building standards for acoustic insulation and soundproofing of buildings, it is essential to systematize the modern methods of studying these characteristics. The purpose of the study was a comprehensive review of methods for determining acoustic characteristics in construction, as well as an analysis of literature and international standards to improve the health and comfort of the urban population.Main part: Due to the variety and complication of the study of the acoustic characteristics of buildings, premises and individual walling, the article provides an analysis of methods for evaluating these characteristics. The limitations on the size of rooms and sound frequencies for measuring reverberation time have been identified. The process of improving the method of measuring acoustic impedance in Kundt’s tube is shown. The methodology for determining the numerical parameters of sound insulation in buildings using the study of building envelopes taking into account the spectra of various noise sources located inside and outside the building is considered in detail. It was found that existing methods for measuring impact noise show poor reproducibility in the low frequency range. The analysis of the works proved that the sound reflection characteristics theoretically depend on the thickness and rigidity of the reflecting surface and its surface density.Conclusions: The scope of building materials with improved acoustic characteristics is quite extensive. Further research may be aimed at improving methods for studying the characteristics of sound absorption and sound reflection.Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.

Combining Values

2002 ◽  
Vol 7 (2) ◽  
pp. 1-4, 12 ◽  
Author(s):  
Christopher R. Brigham
Keyword(s):  
Lower Extremity ◽  
Upper Extremity ◽  
Evaluation Method ◽  
Proximal Phalanx ◽  
Common Error ◽  
The Third ◽  
Whole Person ◽  
Impairment Ratings ◽  
Upper Extremity Impairment ◽  
The Individual

Abstract To account for the effects of multiple impairments, evaluating physicians must provide a summary value that combines multiple impairments so the whole person impairment is equal to or less than the sum of all the individual impairment values. A common error is to add values that should be combined and typically results in an inflated rating. The Combined Values Chart in the AMA Guides to the Evaluation of Permanent Impairment, Fifth Edition, includes instructions that guide physicians about combining impairment ratings. For example, impairment values within a region generally are combined and converted to a whole person permanent impairment before combination with the results from other regions (exceptions include certain impairments of the spine and extremities). When they combine three or more values, physicians should select and combine the two lowest values; this value is combined with the third value to yield the total value. Upper extremity impairment ratings are combined based on the principle that a second and each succeeding impairment applies not to the whole unit (eg, whole finger) but only to the part that remains (eg, proximal phalanx). Physicians who combine lower extremity impairments usually use only one evaluation method, but, if more than one method is used, the physician should use the Combined Values Chart.

Sound source measurement by using a passive sound insulation and a statistical approach

2015 ◽  
Vol 354 ◽  
pp. 278-295 ◽  
Author(s):  
Raffaele Dragonetti ◽  
Sabato Di Filippo ◽  
Francesco Mercogliano ◽  
Rosario A. Romano
Keyword(s):  
Sound Source ◽  
Statistical Approach ◽  
Sound Insulation

scholarly journals International Technical Standards: An Overview

2002 ◽  
Author(s):  
Robert Hebner
Keyword(s):  
Hybrid System ◽  
Economic Benefit ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
International Standards ◽  
Benefit Analysis ◽  
Technical Standards ◽  
Global Standards ◽  
The Individual ◽  
The Cost

The growing globalization of industry is stimulating a growing emphasis on international standards. Standards are important because they provide significant economic benefit. They are also costly and much of the benefit is broad-based, i.e. it does not accrue preferentially to those who incur the cost. Finally, there is a highly disaggregated international standards system and at least two very different basic philosophies as to how standard systems should operate. The effect of the individual cost-benefit analysis by organizations may produce a hybrid system that produces both global standards in which each country participates in the development as well as less costly technical and consortium standards.

scholarly journals Identifying high noise levels with possible health implications at building façades for five crossroads in Tirana, Albania

2018 ◽  
Author(s):  
Kuenda Laze
Keyword(s):  
Questionnaire Data ◽  
Noise Levels ◽  
High Noise ◽  
Geographical Data ◽  
Health Implications ◽  
Building Facades

There are geographical and questionnaire data. Questionnaire data were paper-based data. Geographical data were mainly provided by Openstreemap (www.openstreemap.org).

scholarly journals Comparasion of prediction and measurement methods for sound insulation of lightweight partitions

2012 ◽  
Vol 10 (2) ◽  
pp. 155-167 ◽  
Author(s):  
Momir Prascevic ◽  
Dragan Cvetkovic ◽  
Darko Mihajlov
Keyword(s):  
Transmission Loss ◽  
Road Traffic ◽  
Theoretical Models ◽  
Measurement Methods ◽  
Experimental Results ◽  
Sound Insulation ◽  
Acoustic Absorption ◽  
Noise Levels ◽  
Overall Design ◽  
Acoustic Comfort

It is important to know the sound insulation of partitions in order to be able to compare different constructions, calculate acoustic comfort in apartments or noise levels from outdoor sources such as road traffic, and find engineer optimum solutions to noise problems. The use of lightweight partitions as party walls between dwellings has become common because sound insulation requirements can be achieved with low overall surface weights. However, they need greater skill to design and construct, because the overall design is much more complex. It is also more difficult to predict and measure of sound transmission loss of lightweight partitions. There are various methods for predicting and measuring sound insulation of partitions and some of them will be described in this paper. Also, this paper presents a comparison of experimental results of the sound insulation of lightweight partitions with results obtained using different theoretical models for single homogenous panels and double panels with and without acoustic absorption in the cavity between the panels.

International anti-corruption standards

2021 ◽  
Vol 5 (S4) ◽  
pp. 1552-1567
Author(s):  
Vasyl Topchii ◽  
Svitlana Zadereiko ◽  
Galyna Didkivska ◽  
Olesia Bodunova ◽  
Dmytro Shevchenko
Keyword(s):  
Organized Crime ◽  
Public Institutions ◽  
International Standards ◽  
Negative Consequences ◽  
International Treaties ◽  
World Community ◽  
Competent Person ◽  
The World ◽  
The Individual ◽  
Positive Results

The article studies the issues of combating corruption in the aspect of its incorporation into international standards. Corruption has been identified as a threat to democracy and economic development in many States. It arises from the process of the exchange of power for material assets, that is, when a competent person performs or refrains from performing certain actions for remuneration, and due to the weakness or weakness of the state, political, and public institutions that control and limit these processes. It is noted that the world community is seriously thinking about those negative consequences (threat of statehood, undermining trust in the authorities, causing harm to the individual, society, the functioning of organized crime, a drop in the level of professionalism of employees, a decrease in the level of legal awareness of spirituality) caused by corruption, and realizes that all States need to act as one to achieve serious positive results. It is noted that the international community, to develop effective measures to prevent and eradicate corruption, has adopted several international treaties, as well as recommendations that are not binding but are used by States as effective mechanisms for monitoring corruption.

Optimization of the Sound Source Position for Shaping Acoustically-Structurally Coupled Cavities

2001 ◽  
Author(s):  
Arzu Gonenc Sorguc ◽  
Ichiro Hagiwara ◽  
Qinzhong Shi ◽  
Haldun Akagunduz
Keyword(s):  
Sound Source ◽  
Sequential Quadratic Programming ◽  
Normal Modes ◽  
Sound Field ◽  
Source Strength ◽  
Source Position ◽  
Sound Sources ◽  
Coupled Cavities ◽  
Structural Loading ◽  
Initial Starting

Abstract In this study, sound field inside acoustically-structurally coupled rectangular cavity excited by structural loading and sound sources is shaped by optimizing the position of the sound source. In the optimization, Most Probable Optimal Design (MPOD) based on Holographic Neural Network is employed and the results are compared with Sequential Quadratic Programming (SQP). It is shown that source position, rather than source strength, is more effective in acoustically controlled modes. The nodal positions for in-vacuo acoustical normal modes are good candidates for initial starting points.

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