scholarly journals EXPERIMENTAL STUDIES ON SOUND INSULATION PROPERTIES OF TRADITIONAL WOODEN HOUSES

1984 ◽  
Vol 345 (0) ◽  
pp. 218-225 ◽  
Author(s):  
MASAHITO YASUOKA ◽  
HIDEKI TACHIBANA ◽  
HIROSHI TANAKA ◽  
AKIHIRO TAMURA
Keyword(s):  
Experimental Studies ◽  
Sound Insulation

scholarly journals EFFICIENT ACOUSTIC COMPOSITE PANELS BASED ON GRAPHITE

2021 ◽  
Vol 6 (4) ◽  
pp. 82-90
Author(s):  
E. Fanina
Keyword(s):  
Experimental Studies ◽  
Three Dimensional ◽  
Sound Field ◽  
Fire Retardant ◽  
Pyramidal Cells ◽  
Sound Insulation ◽  
Composite Panels ◽  
Thin Membrane ◽  
Reverberation Time ◽  
Acoustic Characteristics

A set of experimental studies is carried out to determine the acoustic characteristics of three-dimensional panels of fixed thickness made of carbon-based composite material installed in the opening between the reverberation chambers. Sound insulation indices are determined when they are excited by a diffuse sound field in wide frequency ranges. The reverberation time in model chambers with different partition configurations is calculated. The optimal configuration of the partition with pyramidal cells to reduce the reverberation time in the rooms is determined. The use of graphite in the form of thin membrane applied to various surfaces can significantly reduce the sound pressure levels in the room and increase the sound insulation indices of air noise. In addition to thin membrane, graphite can be used as an additive in composite materials for sound insulation purposes. It is shown that the characteristics of such panels are quite universal. The measured acoustic characteristics of composite panels are compared with similar characteristics of traditional materials. It is determined that the composition belongs to the I group of fire-retardant efficiency and can be recommended for use as a fire-retardant material. The developed acoustic material is an effective absorbing agent that solves problems in architectural acoustics, echo cancellation in construction and architecture. Similar to metamaterials, natural and artificial graphites allow to solve these problems with small volumes and masses using simple and inexpensive technologies.

scholarly journals EXPERIMENTAL RESEARCH OF IMPACT NOISE STRUCTURE FLOORS WITH CHANGING THICKNESS OF MATERIALS AND SIZE FILLER

2021 ◽  
Vol 30 (1) ◽  
pp. 6-11
Author(s):  
I. Babii ◽  
◽  
L. Kucherenko ◽  
Ye. Kalchenia ◽  
◽  
...  
Keyword(s):  
Experimental Research ◽  
Experimental Studies ◽  
Expanded Polystyrene ◽  
Sound Insulation ◽  
Material Thickness ◽  
Impact Noise ◽  
Noise Structure ◽  
Impact Protection ◽  
Insulation Performance

This paper considers experimental studies of the sound insulation structure of the floor to determine the effect of material thickness, polystyrene concrete and cement-sand screed, as well as the size of the aggregate (polystyrene granules) in polystyrene concrete on the sound insulation properties of floor construction, namely impact protection. It was determined that the thickness of the cement-sand screed in no way affects the improvement of impact noise. Due to the reduction of the size of the aggregate (expanded polystyrene granule) in polystyrene concrete, it was possible to reduce the thickness of the structure, which did not affect the insulation performance of impact noise.

Research of the Influence of Geometric Parameters of Rooms for Sound Insulation of Lightweight Partitions

2021 ◽  
pp. 37-47
Author(s):  
Д. В. Монич ◽  
И. В. Матвеева ◽  
П. А. Гребнев ◽  
Д. С. Кузьмин
Keyword(s):  
Noise Source ◽  
Experimental Studies ◽  
Sound Field ◽  
Sound Insulation ◽  
Mirror Reflection ◽  
Sound Waves ◽  
Good Convergence ◽  
Boundary Frequency ◽  
Field Sound ◽  
Wave Modes

Состояние проблемы. Звукоизоляция легких перегородок значительно зависит от места их установки в здании. Необходимы исследования структуры звукового поля в несоразмерных помещениях и анализ его влияния на звукоизоляцию легких ограждений. Результаты. Проведены натурные и лабораторные экспериментальные исследования звукоизоляции каркасно-обшивной перегородки, установленной в коридоре. Для случая соразмерного помещения получена хорошая сходимость результатов. Теоретически исследована структура звукового поля при зеркальном отражении звука (с использованием метода прослеживания лучей). Выполнены расчеты с получением распределений долей осевых, касательных и косых лучей в помещениях, расчеты уровней интенсивности звуковых волн, падающих на боковые стены и потолок коридора. Учитывалось положение источника шума относительно перегородки и других ограждений. Выводы. Пропорции помещений влияют на звукоизоляцию легких ограждений. В диапазоне ниже граничной частоты диффузности несоразмерного помещения с источником шума структура звукового поля неоднородная, звуковые лучи падают на ограждение неравномерно с различных направлений. Это приводит к уменьшению совпадений мод колебаний в воздухе и в ограждающей конструкции, частотная характеристика звукоизоляции ограждения имеет пикообразный вид. Statement of the problem. Sound insulation of lightweight partitions depends significantly on the place of installation in the building. It is necessary to study the structure of the sound field in disproportionate rooms and analyze its effect on the sound insulation of light enclosures. Results. Natural and laboratory experimental studies of the sound insulation of the frame partitions installed in the corridor were carried out. For the case of a commensurate room, good convergence of the results was obtained. The structure of the sound field with mirror reflection of sound has been theoretically investigated using the method of tracing of sound rays. Calculations were performed to obtain the distributions of the proportions of axial sound rays, tangential sound rays, oblique sound rays in the premises, and the calculations of the intensity levels of sound waves incident on the lightweight partition and other enclosures of the corridor. The position of the noise source relative to the lightweight partition and other enclosures of the corridor was taken into account. Conclusions. The proportions of the rooms affect the sound insulation of lightweight enclosures. The structure of the sound field of a disproportionate room with a noise source is non-uniform in the range below the boundary frequency of diffuse sound field. Sound rays fall on the lightweight partition unevenly from different directions. This leads to a decrease in the coincidence of wave modes in the air and wave modes in the lightweight partition. The frequency characteristic of the sound insulation of the lightweight partition has a peak-like appearance.

scholarly journals The study of the effectiveness of sound insulation of gypsum wall boards with “Shimast” coating

2020 ◽  
Vol 320 ◽  
pp. 00033
Author(s):  
Semen Totunov ◽  
Michael Ivanov ◽  
Olga Ivanova
Keyword(s):  
Thin Layer ◽  
Experimental Studies ◽  
Single Layer ◽  
Sound Insulation ◽  
Reverberation Chamber ◽  
Research Results ◽  
Partition Walls ◽  
Acoustic Reverberation ◽  
Layer Coating

The article presents the experimental studies of sound insulation of a single-layer barrier made of gypsum wall boards with a thin-layer coating. The coating consists of a viscous base and glass airless microgranules. The coating increases the efficiency of reducing air noise. The material is applied as a normal paint by spraying on the surface. The research results have been obtained in an acoustic reverberation chamber designed to study the partition walls effectiveness.

scholarly journals THE EFFICIENCY OF THE NOISE REDUCTION LEVELS OF THE LOCOMOTIVES AND DIESEL LOCOMOTIVES

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 92-96
Author(s):  
Ivan Yaitskov ◽  
Alexander Chukarin
Keyword(s):  
European Union ◽  
Combustion Engine ◽  
Experimental Studies ◽  
High Capacity ◽  
Railway Track ◽  
Rolling Stock ◽  
Sound Insulation ◽  
The European Union ◽  
Noise Component ◽  
Foreign Countries

The creation of the high capacity transport vehicles where vibro active parts are increasingly used that inevitably leads to an increase in vibration and noise levels and it adversely affects the locomotive crews as well as pollute acoustically while operating in a residential area. This problem is most relevant for rolling stock. The recommendations of the European Union are aimed at reducing the noise of the railway transport directly in its places of origin as rolling stock and track structures. It should be noted that the noise decline should not be limited to measures of the indirect protection: the construction of the noise protection walls and the use of the noise protection windows in buildings located close to the railway track. First of all, in the opinion of the European Union, it is necessary to implement measures to suppress noise in the sources themselves. For solving the problem, the research has been carried out by different experts from foreign countries. However, the process of the formation vibro acoustic characteristics is not well understood. The diesel locomotives and locomotives are intensively exploited. It should be considered that one of the main sources of the air and structural noise component is an internal combustion engine for these machines, the noise and vibration levels which are practically impossible to reduce in the industrial conditions. Therefore, on the basis of the theoretical and experimental studies, the practical recommendations have been developed for achieving sanitary noise standards by ensuring the required sound absorption and sound insulation values.

ENGINEERING METHOD FOR CALCULATING SHOCK NOISE ISOLATIONBETWEEN FLOORS WITH FLOORS MADE OF WOOD MATERIALS

2020 ◽  
Vol 90 (4) ◽  
pp. 3-11
Author(s):  
V.A. GORIN ◽  
◽  
V.V. KLIMENKO ◽  
M.A. POROZHENKO ◽  
◽  
...  
Keyword(s):  
Noise Level ◽  
Computational Models ◽  
Experimental Studies ◽  
Engineering Method ◽  
Sound Insulation ◽  
Good Correspondence ◽  
Method Of Calculation ◽  
Impact Noise ◽  
The Impact ◽  
Approximate Formulas

An engineering method for calculating shock noise isolation by floor-to-floor overlappings with wood-based materials is proposed. The calculation considers overlaps with floors made of wood materials laid on glue and with floors laid on an elastic substrate. The calculation takes into account the effect on sound insulation of the surface density and stiffness of the floor covering material and the sound insulation layer. The calculation is reduced to calculating the frequency characteristic of reducing the impact noise level due to the construction of a floor made of wood materials and comparing the calculated value of the index of the reduced impact noise level with the standard ones. The list of necessary input data and the sequence of calculation execution is given. Approximate formulas for calculating the frequencies that limit the application of computational models of the overlaps under consideration are compiled. Equations and approximate formulas are given for determining the critical (antiresonance) and resonant frequencies of vibrations, one -, two-and three-layer overlaps, and their values are determined for various mechanical and geometric parameters of layers. Frequency ranges of growth and decrease of shock noise level by these overlaps are determined. Comparison of the calculated and measured frequency characteristics of shock noise reduction showed a good correspondence of the results obtained by the engineering method of calculation with experimental studies. The developed practical recommendations for improving the isolation of shock noise between floors with floors made of wood materials, used in the construction of civil buildings, can increase acoustic comfort in buildings under construction and under reconstruction.

scholarly journals BEHAVIOURAL STUDIES ON TRIPLE BLENDED FOAM CONCRETE

2020 ◽  
Vol 184 ◽  
pp. 01104
Author(s):  
G.V.V. Satyanarayana ◽  
P. Gayathri
Keyword(s):  
Construction Industry ◽  
Coarse Aggregate ◽  
Experimental Studies ◽  
Sound Insulation ◽  
Air Bubbles ◽  
Foam Concrete ◽  
Conventional Concrete ◽  
Foaming Agent ◽  
Architectural Features ◽  
Time Strength

In recent days construction industry focuses on other than conventional concrete in infrastructural purposes like building etc., due to excess usage of cement, sand and other aggregates which leads depreciation of natural resources and effects on the environment. By utilization of lightweight bricks and foam concrete which reduces not only its self-weight but also improve resistance against heat and sound insulation and architectural features. The density of foam concrete varies from 300 to 1800kg/m3. Foam concrete composes of cement, water, fly ash and foaming agent without coarse aggregate. The function of foam is to create air bubbles in the cement-based slurry. The density of foam concrete depends on the quantity of foam added. The foam creates several pores with this effect; it has low thermal conductivity. As density of foam concrete is low at same time strength also low when compared to conventional concrete, so an attempt made to improve mechanical properties of foam concrete by adding admixtures like Silica fume and GGBS in different percentages. In these experimental studies, the workability and compressive strengths are mentioned

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