Wood is a sustainable renewable material that widely used in the building sector. Due to recent trends green initiatives European and other countries, wood waste becoming more popular for sound absorption insulation because of its renewability. Recycled granulated charcoal an effective acoustic treatment. In this study, we investigated coefficients raw species: birch (Betula pendula), pine (Pinus sylvestris), oak (Quercus robur). The impedance tube method was characterize properties...

The modeling programs provide a wide range of possibilities for simulating acoustic systems. This paper describes used in acoustics various purposes, such as Sound PLAN, AFMG SoundFlow, WinFLAG, Comsol multiphysics, ANSYS, Roomsim. For the purposes current research, simulation room was carried out. Physical parameters impedance, sound hard boundary and normal velocity were considered. pressure level rooms investigated. Possibilities using Multiphysics research Results show high-frequency...

As the demand for sustainable materials in acoustic applications grows, mesoporous charcoal—produced via biomass pyrolysis—has emerged as a promising material absorption and thermal insulation. This study investigates its properties using impedance tube anechoic chamber measurements, alongside comparisons with mass law predictions. Charcoal samples, characterized by pore sizes ranging from 2 to 50 nm fraction 1 4 cm, were tested across varying thicknesses (5 10 17 cm) frequencies (315 Hz...

Abstract Wood charcoal is a sustainable, renewable, and environmentally friendly material with the use that acoustic device can produce. Charcoal made of wood waste materials allows for improving indoor acoustical quality. Therefore, this objective article to investigate sound scattering coefficients QRD perforation ratio oak elements. Sound coefficient calculated measurement reverberation time in chamber. The calculation results show growth frequencies - highest value reached 0.88 (diffuser...

Charcoal is an environmentally friendly, biodegradable, and economical material. This material usually produced by slow pyrolysis—the heating of wood or other substances in the absence oxygen. The aim this study was to investigate acoustic efficiency charcoal design diffuser that utilizes charcoal. Samples different types tree charcoal—birch (Betula pendula), pine (Pinus sylvestris), oak (Quercus robur)—with thicknesses were used for measurements. sound absorption reflection properties...

Quadratic residue diffuser (QRD) is a device that distributes the acoustic energy of intense reflections by its spatial and temporal dispersion. The quadratic consists series wells different depths same width. Optimal diffusion very important for perceiving musical sound eliminating unwanted effects e.g. echoes. For purpose to determine optimal diffusion, Schroeder used mathematical number sequences allowing diffuse in semicircular pattern from devices. In this paper, presented modeling...

To design a sound-absorbing panel, it is important to identify factors that affect the maximum sound absorption of low, middle and high frequency sounds. Perforation effect very for noise-reducing noiseabsorbing panels. Perforations are often used reduction. Experimental data shows perforation effective absorb low-frequency noise. In presented study, influence coefficient noise reduction was analyzed with theoretical experimental methods. The experiments were conducted in chamber using an...

Nowadays there is a tendency towards increasing of anthropogenic pollution in the atmospheric air large cities. Therefore, important measures have to be taken for improvement environment. In order optimize quality city and reduce emissions from stationary mobile sources, it predict state city, which based on analysis characteristics adverse weather conditions conducive accumulation harmful impurity lower (ground) layer air. The paper identifies analyzes Cherkassy (Ukraine) period 2011–2015,...

Wood charcoal is sustainable, renewable, environmentally friendly material using which the acoustic device may be produced. Charcoal made of wood waste materials allows to improve indoor acoustical quality. The current article aims investigate sound scattering coefficients quadratic residue diffusers with covering oak (Quercus robur) elements. coefficient calculated due reverberation time measurement in chamber. calculation results show growth frequencies – highest value reached 0.88...

The acoustic diffuser is the device that distributes energy of intense reflections through their spatial and temporal dispersion. for reduction unvented effects improves indoor sound quality. Triangle diffusers are made wood plates covered with charcoal elements. high reflection co-efficient in production diffusers. Charcoal an ecologically friendly natural material. result studies triangle showed values scattering coefficient, a maximum value (of 87) at frequencies 2000 80% charcoal....