Sound Insulation Determination of Door

The structural complexity of a door causes difficulties in the description of its behavior from an acoustical point of view. In many cases, even a small change can cause a big difference in its sound-isolating properties. To determine the acoustical quality of a door, it is important to perform laboratory measurements of the door structure and door frame, the gaps including. A mathematical analysis based on experimental measurements of the sound reduction index of several door constructions was used to determine the acoustical door categories. The equations for calculating the sound reduction index, which were introduced in this paper, should help in the design of a suitable door from an acoustical point of view.

IMPLEMENTATION OF LABORATORY MEASUREMENT OF AIRBORNE SOUND INSULATION BASED ON ISO AND ASTM STANDARDS IN NATIONAL STANDARDIZATION AGENCY OF INDONESIA (BSN)

Jurnal Standardisasi ◽

10.31153/js.v23i1.861 ◽

2021 ◽

Vol 23 (1) ◽

pp. 77

Author(s):

Bondan Dwisetyo ◽

Maharani Ratna Palupi ◽

Fajar Budi Utomo ◽

Chery Chaen Putri ◽

Dodi Rusjadi ◽

...

Keyword(s):

Transmission Loss ◽

Laboratory Measurement ◽

Sound Insulation ◽

Reference Curve ◽

Airborne Sound ◽

Significant Difference ◽

Single Number ◽

Sound Reduction ◽

<p>The implementation of laboratory measurement of airborne sound insulation based on ISO and ASTM standards was carried out at SNSU BSN. The aim of this work to realize the measurement of airborne sound insulation for several sample tests, where the procedure of the test is performed according to the updated standard ISO 10140 and ASTM E90. Besides, the single number rating also is determined based on ISO 717-1 and ASTM E413. This measurement has been conducted in the two reverberation rooms using pressure method consist of measuring the sound pressure level, measuring the reverberation time, obtaining the sound reduction index (R) or sound transmission loss (STL), and determination of a single-number ratings of the samples test. From the results, some parameter requirements such as the frequency range and the rounding procedure of R or STL influence the measurement result slightly. Subsequently, the significant difference is obtained for the determination of single number rating in the shifting procedure of the reference curve.</p>

Determination of the Airborne Sound Insulation of a Straw Bale Partition Wall

Civil and Environmental Engineering ◽

10.1515/cee-2017-0003 ◽

2017 ◽

Vol 13 (1) ◽

pp. 20-29 ◽

Cited By ~ 1

Author(s):

Jiří Teslík ◽

Radek Fabian ◽

Barbora Hrubá

Keyword(s):

Sound Insulation ◽

Partition Wall ◽

Airborne Sound ◽

University Of Technology ◽

Wide Range ◽

Scientific Project ◽

Sound Reduction ◽

Straw Bale ◽

AbstractThis paper describes the results of a scientific project focused on determining of the Airborne Sound Insulation of a peripheral non-load bearing wall made of straw bales expressed by Weighted Sound Reduction Index. Weighted Sound Reduction Index was determined by measuring in the certified acoustic laboratory at the Faculty of Mechanical Engineering at Brno University of Technology. The measured structure of the straw wall was modified in combinations with various materials, so the results include a wide range of possible compositions of the wall. The key modification was application of plaster on both sides of the straw bale wall. This construction as is frequently done in actual straw houses. The additional measurements were performed on the straw wall with several variants of additional wall of slab materials. The airborne sound insulation value has been also measured in separate stages of the construction. Thus it is possible to compare and determinate the effect of the single layers on the airborne sound insulation.

Analysis of Predictive Calculation Methods of Airborne Sound Insulation

10.4028/www.scientific.net/amm.835.573 ◽

2016 ◽

Vol 835 ◽

pp. 573-578 ◽

Cited By ~ 3

Author(s):

Naďa Zdražilová ◽

Denisa Donová ◽

Iveta Skotnicova

Keyword(s):

Acoustic Properties ◽

Sound Insulation ◽

Building Structures ◽

Calculation Methods ◽

Airborne Sound ◽

Mutual Comparison ◽

Sound Reduction ◽

Acoustic properties of building structures are currently very actual theme with regard to the development of new building and insulating materials, while the methods for estimating the airborne sound reduction index evolve mainly from the second half of the 20th century. For mutual comparison of selected prediction methods and for determination of their suitability it has been provided a calculation of weighted sound reduction index RW [dB] from the input parameters of materials identified by laboratory measurements, calculation of weighted apparent sound reduction index R ́W [dB] and these values were compared with in-situ measurements. The aim of this paper is to determine the most appropriate method to calculate RW [dB] and R ́W [dB] values of lightweight building constructions with regard to their practical applicability, accuracy of estimation and complexity of the calculations.

Research on the Prediction of Impact Sound Insulation to a Homogeneous Wall

10.4028/www.scientific.net/amm.744-746.1593 ◽

2015 ◽

Vol 744-746 ◽

pp. 1593-1596

Author(s):

Shang You Wei ◽

Xian Feng Huang ◽

Zhi Xiang Zhuang ◽

Jun Xin Lan

Keyword(s):

Energy Analysis ◽

Sound Transmission ◽

Sound Insulation ◽

Statistical Energy Analysis ◽

Analysis Framework ◽

Mechanism Of Impact ◽

Sound Reduction ◽

The Impact ◽

Insulating Properties ◽

In this paper, a theoretical model to evaluate impact sound transmission through a homogeneous wall is proposed. The model which is based on the Statistical Energy Analysis framework exhibits a system with room-wall-room. For the purpose to explore the mechanism of impact sound transmission through a wall, the impact sound reduction index between two rooms are predicted. Meanwhile, the variation of impact sound reduction index with the walls properties are also taken into account. The results reveal that the density, elastic modulus and thickness of a homogeneous wall have diverse effects on its impact sound insulation and can be chosen adequately to achieve ideal insulation values.It provides an approach to optimize impact sound insulating properties of the walls.

Slits' Effects on Sound Insulation for Lightweight Partitions

10.4028/www.scientific.net/amm.507.153 ◽

2014 ◽

Vol 507 ◽

pp. 153-156

Author(s):

Xian Feng Huang ◽

Quan Shi ◽

Chen Hui Zhu

Keyword(s):

Sound Insulation ◽

High Frequencies ◽

Rectangular Aperture ◽

Index Variation ◽

Sound Reduction ◽

The slits on the lightweight partitions have a significant effect on sound insulation which is investigated in this paper. According to Gomperts model for rectangular aperture, the sound reduction index of a wall with slits can be predicted. Two lightweight partitions were selected to analyze their sound reduction index variation with factors such as width, length and location of slits. Results show that these factors affect the sound insulation evidently, especially at high frequencies.

Trace Elements Analysis in Drinking Water of Meghalaya by Using Graphite Furnace-Atomic Absorption Spectroscopy and in relation to Environmental and Health Issues

Journal of Chemistry ◽

10.1155/2014/975810 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 9

Author(s):

Elarina N. Dkhar ◽

Paul S. Dkhar ◽

Jasha Momo H. Anal

Keyword(s):

Water Quality ◽

Trace Elements ◽

Drinking Water ◽

Graphite Furnace ◽

Major And Trace Elements ◽

Point Of View ◽

Health Issues ◽

Trace Elements Analysis

Determination of the certain major and trace elements was carried out in drinking water supply scheme in three districts of Meghalaya. This work aims to identify trends resulting in the deterioration of drinking water which is also a potential source of environmental contaminants. About 50 samples, each from one district, were collected both from the source and various tanks and tap. The elements determined are Li, Na, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Rb, Ag, Au, Pb, Cd, Se, Ca, K, and Mg. The pH is slightly lower than neutral pH of 7 while the turbidity is very high even after treatment. The concentrations of Ca and Mg are found to be deficient. The elements Cr, Fe, Co, Ni, Zn, Mo, and Pb decrease after treatment while Mn, Cu, and Cd increase slightly after treatment. Se concentration is found to be much higher than expected. The results were compared with the standard recommendation values for the quality of drinking water. This study provides a general indication of where water-quality constituent concentrations met or exceeded water-quality standards and the data presented in this report will be useful from public health point of view.

Technical Note: Determination of Impact Noise of Floors Based on Vibration Measurements

Building Acoustics ◽

10.1260/135101007781998901 ◽

2007 ◽

Vol 14 (3) ◽

pp. 223-229

Author(s):

Simone Secchi ◽

Gianfranco Cellai

Keyword(s):

Field Measurement ◽

Technical Note ◽

Vibration Velocity ◽

Vibration Measurements ◽

Impact Noise ◽

New Type ◽

Sound Reduction ◽

Velocity Level ◽

Field measurement of acoustical performances of buildings is difficult where construction has not been completed. The absence of doors, windows and other finishing details, generates sound transmission paths, which can modify the results of measurements. In these cases, acoustical performances of building, such as sound reduction index and impact noise, can be determined through the temporary close of all openings, or through the measurement of the vibration velocity level of the partitions examined. Both techniques allow the elimination of airborne transmission paths, while the second also permits the evaluation of the contribution of structural flanking transmission. In this paper, a technique is described for the estimation of impact noise of floors from measurements of velocity levels. Results are presented for a concrete floors and a comparison given between the traditional and new type of measurements.

OPPORTUNITY COST ARE A KEY TO CASH PUZZLE OF THE COMPANY

Strategic decisions and risk management ◽

10.17747/2078-8886-2015-1-98-105 ◽

2015 ◽

pp. 98-105

Author(s):

S. I. Lutsenko

Keyword(s):

Capital Market ◽

Opportunity Cost ◽

Random Effect ◽

Point Of View ◽

Model Specification ◽

Opportunity Costs ◽

Internal Sources ◽

Relationship Of

Features of influence of opportunity cost on the cash policy of the Russian companies are considered. The author analyzes relationship of cause and effect of escalating of cash. The author researched features of a choice the Russian companies of sources of financing. The author shows that availability of opportunity costs forces the companies to be reoriented on internal sources of financing. Opportunity costs are the indicator for a choice of optimum financing. The model (specification) presented in work is tested for determination of its adequacy, from the point of view of quality of forecasting. It is estimated three kinds of specifications: pooled regression, regression with a random effect and regression with the fixed effect. The purpose of work attempt to open cash puzzle of company disclosing of a puzzle. That is, to reduce opportunity costs for preserving of cash as the preventive motive, allowing to struggle with financial restrictions. Novelty of the presented work consists that the companies can rationally manage cash holdings, using negative shocks (signals) in the capital market, to expect them and without supposing the situations connected with financial restrictions.

Modification of Watters’ Formula for Simple Aerated Concrete Walls

10.4028/www.scientific.net/amm.820.443 ◽

2016 ◽

Vol 820 ◽

pp. 443-447

Author(s):

Monika Pavčeková ◽

Rastislav Menďan

Keyword(s):

Theoretical Determination ◽

Concrete Walls ◽

Surface Mass ◽

Aerated Concrete ◽

Sound Reduction ◽

The contribution presents a mathematical modification of Watters’ formula used in modified Watters’ method. This formula expresses a dependence of sound reduction index on surface mass (mass law). On the basis of the previous research which resulted in the finding that the Watters’ method do not give acceptable results for simple walls from aerated concrete, the mentioned formula was modified to be usable for theoretical determination of sound reduction index of simple aerated concrete walls. The contribution also presents a modification of this formula for calculation of sound reduction index of simple aerated concrete walls with a plaster on both sides.

Retrofitting masonry and cavity brick façades for different noise zones using laboratory measurements

Building Acoustics ◽

10.1177/1351010x17693399 ◽

2017 ◽

Vol 24 (2) ◽

pp. 77-100 ◽

Cited By ~ 2

Author(s):

Sevtap Yilmaz Demirkale ◽

Mine Ascigil-Dincer

Keyword(s):

Indoor Environment ◽

Single Layer ◽

Mineral Wool ◽

Sound Insulation ◽

Brick Wall ◽

Gypsum Board ◽

Cavity Depth ◽

Sound Reduction ◽

New Buildings ◽

Façade airborne sound insulation is crucial for protection of indoor environment from environmental noise. In Turkey, sound insulation in new buildings is bound by law, but 6 million pre-1980 dwellings with thin brick walls and single-glazed windows used in highly transparent façades should be retrofitted. In this study, sound reduction index of masonry and cavity exterior walls which consist of brick, mortar, gypsum board and mineral wool and of common window types is measured in sound insulation test rooms. The study compares and evaluates the effects of plaster, brick thickness, cavity depth, mineral wool thickness and mineral wool placement on sound reduction index values, using traditional materials and building techniques. Traditional brick wall façades and possible retrofitting of these façades are evaluated for sound insulation of bedrooms and living rooms in different noise zones, 55, 60, 65, 70 and 75 dBA, with various transparency ratios, 0%, 30%, 40%, 50% and 70%. The analysis shows that window types and single-layer walls are the deterministic factors in evaluating sound insulation in retrofitting projects and that it is not possible to provide proper aural comfort in high noise zones.