Abstract In this study, the insertion loss of devulcanized waste rubber baffles were evaluated. Acoustic are suitable to reduce noise from devices or machines by interfering with their emitting sound waves. Knowledge acoustic properties material used is significant importance in ensuring effectiveness baffle. Basic include airborne insulation, which usually determined during laboratory tests. Baffles consists absorbing and insulating materials. plasterboards as material. During...

The growing amount of used tires presents many environmental challenges around the world. Therefore, new ways to reuse are being sought. One uses waste is in sound-insulating constructions. Waste can be shredded into granules, which further devulcanized increase their porosity. These granules then glued panels and structures. Acoustic louvers were investigated this study, with louvers’ plates covered rubber granule panels. Sound absorption parameters tested across frequency bands ranging...

Transport noise is a serious problem in cities and has negative impact on both health economics. In addition to the aforementioned unnoticed effects, traffic also been identified as one of leading causes sleep disorders, annoyance cardiovascular effects. This research consists three parts: part involves onsite measurements Trakai town; two simulates at different average vehicle speeds; assesses number people affected by noise. The carried-out simulation demonstrated that level changes very...

According to circular economy principles, the recycling and reuse of waste tyre rubber is one most advanced ecological disposal technologies. Each year about 19 million tons tyres are produced, this amount increasing each year. One innovative ways recycle devulcanization. There many methods devulcanization, but popular grinding chemical. In article devulcanized granules were used for preparation samples. Two them obtained by method chemical 15 different samples produced experimental...

One of the biggest problem in most cities – noise emissions environment caused by transport. It is found that can cause not only discomfort, but it also harmful to health. Therefore, topical environmental problem. In this article vehicle are evaluated, depending on traffic Trakai city. At selected locations northern and southern parts city equivalent maximum levels measured. According estimates day, evening night, using CadnaA program, maps simulated. The map will show night. Measurement...

In this study, the insertion loss of devulcanized waste rubber baffles was evaluated. Acoustic are suitable for reducing noise from devices or machines by interfering with their emitting sound waves. Knowledge acoustic properties material used is significant importance in ensuring effectiveness baffle. Basic include airborne insulation, which usually determined during laboratory testing. Baffle consists absorbing and insulating materials. plasterboards were as material. Devulcanization...

According to circular economy principles, the recycling and reuse of tyre rubber waste are among most advanced ecological disposal technologies. Each year, about 19 million tons tyres produced, this number increases every year. One innovative ways recycle is devulcanization. There many methods devulcanization, but popular chemical Also, pre-process treatment important before In article, devulcanized granules were used for preparation samples. Two samples obtained via grinding method one...

The excessive noise of machines and devices could be reduced with the use acoustic enclosures. Additional requirement for enclosures: free air circulation through construction walls, which is important device ventilation. properties parts are essential to model their ability reduce noise. basic airborne sound insulation walls absorption used material should experimentally tested. In this article, reduction modelling enclosure recycled materials covered was presented. Sound pressure level...

In this article was analyzed acoustic efficiency of two different construction noise barriers. Field measurements tests were carried out before and behind a wooden barrier, which height 2.9 meters wall with equipped roof, 3.2 m. As is known the length wall, height, surface roughness, shape material – key aspects determining effectiveness barrier. Different materials, depending on their characteristics hard or soft, porous dense, interact differently sound waves. Article contains research...

Tyrimų metu buvo ištirtos dvi skirtingos akustinių žaliuzių konstrukcijos. Viena konstrukcija sudaryta iš 7 medinių plokščių, įtvirtintų mediniame rėme, kurių ilgis 1 metras ir plotis 0,3 metro. Kita tokių pačių parametrų metalinių plokščių rėme. Atlikus matavimus nustatyta, jog konstrukcijos su medinėmis plokštėmis garso lygio sumažėjimas yra didesnis visame dažnių diapazone. Žemų garsą ši slopina iki 5 dB geriau, vidutinių taip pat o aukštų diapazone lygi 12–15 geriau. Lyginant abi...

Akustinės žaliuzės yra skirtos įrenginių, kuriems reikalingas vėdinimas bei oro įtraukimas-išmetimas, triukšmui slopinti. Iš įrenginių išeinantis srautas pereina per konstrukcijos plokštes, kurios sugeria iš sklindantį triukšmą. Tačiau plokštės pratekančiam orui sukelia aerodinaminį pasipriešinimą, dėl kurio gali atsirasti neigiamas efektas: susidaro dideli slėgiai, oras negali laisvai judėti ir tai trukdo veikimui. Todėl norint išspręsti šį uždavinį, buvo pasitelkta modeliavimo programa...