EXPERIMENTAL STUDIES ON IMPROVEMENTS OF FLOOR IMPACT SOUND INSULATION OF FLOOR AND WALL CONSTRUCTION OF WOODEN BUILDINGS

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.

Download Full-text

Sound insulation properties of sandwich structure with hemispheric shell cores: Numerical and experimental studies

Applied Acoustics ◽

10.1016/j.apacoust.2020.107209 ◽

2020 ◽

Vol 162 ◽

pp. 107209 ◽

Cited By ~ 3

Author(s):

Guilin Wen ◽

Yonghui Zhang ◽

Jie Liu

Keyword(s):

Sandwich Structure ◽

Experimental Studies ◽

Sound Insulation

Download Full-text

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

Modern technology materials and design in construction ◽

10.31649/2311-1429-2021-1-6-11 ◽

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.

Download Full-text

Countermeasures against floor impact sound by heavy impact source of a box floor structure in a reinforced concrete wall construction testing device

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-1832 ◽

2021 ◽

Vol 263 (5) ◽

pp. 1396-1404

Author(s):

Ryuta Tomita ◽

Kyoko Abe

Keyword(s):

Reinforced Concrete ◽

Sound Level ◽

Sound Insulation ◽

Testing Device ◽

Concrete Wall ◽

Heavy Weight ◽

Floor Structure ◽

Reinforced Concrete Wall ◽

Wall Construction ◽

Bare Surface

We have performed experimental examinations for the purpose of proposing a floor finishing structure with superior effects in terms of combating heavy-weight floor impact sound. We have developed a box floor with ease of construction and excellent heavy-weight floor impact sound insulation performance and examined its effect with a 1200 × 1200 mm test piece connected to inter-noise 2020. The box floor has a floor finishing structure with anti-vibration and sound insulation measures aimed at improving measures against heavy-weight floor impact sound. We herein report the results of a basic examination on the reduction of the transmitted heavy-weight floor impact sound of a box floor structure in a reinforced concrete wall construction testing device when the area is further expanded to about 10 . As a result, with the air layer under the box floor open, the floor impact sound level was reduced by 9 dB in the 63-Hz band compared to the bare surface. In addition, with the air layer at the bottom of the BOX floor sealed, the floor impact sound level was reduced by 5 dB in the 63-Hz band compared to the bare surface.

Download Full-text

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

НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ ◽

10.36622/vstu.2021.64.4.003 ◽

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.

Download Full-text

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

MATEC Web of Conferences ◽

10.1051/matecconf/202032000033 ◽

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.

Download Full-text

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

Akustika ◽

10.36336/akustika20193292 ◽

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.

Download Full-text