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Log houses for sale needed to prevent construction concerns. Urban growth, expansion of the industry, the increasing number of vehicles is increasingly expanding and acoustic noise zone. Road transport is the largest acoustic noise (hereinafter - noise) source the collection in the city. It accounts for about 80 82proc. general noise level. the collection Local street (7 m), the noise level is 75 dBA, multi-lane highway - 85 dBA at the airport take-off jet aircraft (60 m) -120 dBA, sports grounds and games of 65-75 dBA, the famous he talked the collection at - 60 dBA, and so on. Noise is not working on a human body, but most of all - acoustic the collection analyzer, central nervous and cardiovascular systems (Baltrėnas, Butkus and others. 2008). Acoustic noise - it is {varying the strength and frequency of the sound waves in a whole which may cause adverse effects to health and harmful effects. Noise measurement unit is the decibel, dB. The impact of noise depends on the volume (dB) Frequency (Hz) and duration. Allowable noise level, which is a short or long term acting not cause diseases or medical conditions governing the Lithuanian Hygiene the collection Standard HN33-2006 Acoustic Noise. Permitted levels of living and working environment. " Noise level in the residential area on the day should not exceed 55 dBA at night - 45 dBA, recreation areas - 60 dBA, and so on. Noise problem the collection in facing historic urban architectural, technical and technological organization of traffic the collection engineering and security measures.
The town stands a good attenuation. Plantations traps and absorbs noise like a filter. For example, 500 Hz frequency sound waves trapped in the crowns of trees or bushes, confronted with an acoustic barrier from which bounces around 32% of the sound energy, while the other part - 68% is absorbed as the (oriented at various directions leaves scatter sound waves and elastic stalks weaken the sound wave energy. injuries best suppresses high frequency sounds. Warsaw with plantations studies show that each element the collection of the composite urban green space, noise suppression, plays a greater or lesser role. example, 6.10 m wide and 15 July the crown reduces the noise level 3.4 and about 5 dB. T \ io the same time, 160 cm high and 100 cm wide, hornbeam hedge, located 13 m from the sound source, reduces noise by 6-7 dB, 7-8 m wide, dense trees and bushes band decreases noise 10-13 dB, while thick 40 m wide band - even 17-23 dB. rare 30 m wide strip of trees and shrubs reduce noise only 8-11 dB. Copyright studies suggest that green efficiency to suppress noise, dropping leaves, the collection reduced approximately 50-80%. depending on tree species. summarize the results of many studies, it can be argued that good publications equipped bar is a powerful tool for noise maiinti. the collection appropriate vegetation planting strip to the noise source or the object to be protected, the collection and even better - in both places. Recommended ieldinius planting strip cross-section - a rectangular triangle, starting with winter and ending with high trees and the sides of tree row complement the bushes, leaving gaps penetrating sound. wakerobin green bands have directed their squad audio source. Approximately one meter plods the green belt will reduce the noise an average of 0 from 0.4 to 0, 5 dB / m.
One green band noise suppression efficiency can be calculated using a very simple B. Prutkov, P. Shishkin, C. Osipov and P. Karagodinos formulas. Inhibition of the target sound source (compressor, noisy sports facilities, transport vehicles, the collection etc..) the collection Efficiency calculated according to the formula, and the linear noise source (rail transport, long a bustling shop, and so on.) - Formula: It allows you to select the sound will skip wooden garden houses.
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