EURO-ECO 2010 Hanover 2 - 3 Dezember 2010	Environmental, Engineering - Economic and Legal Aspects for Sustainable Living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover University of Bremen, Bremen

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Due to current economic development of cities transport infrastructure plays an important role. One of the biggest problems of urbanized areas is acoustic discomfort. The main reason for noise pollution is ever increasing density and velocity of traffic currents. Test centre “Ecological safety and labour protection” has been doing full-scale investigations for four years. They have found out that in several districts of Saint Petersburg maximal and equivalent noise levels exceed permitted sanitary norms.

One of the most efficient and widely available means of protection of residential areas from traffic noise are sound baffles. They allow to reduce variations in noise levels in different city districts and to increase urban area efficiency by constructing residential and public buildings in places which would have been unsuitable for these purposes without sound baffles because of maximal and equivalent noise levels overshoot.

Baffles made of vertical walls with different lateral sections are considered as the most promising ones. They are put close to noise sources. Sound baffle efficiency is conditioned by location, height and material of baffle surface. The efficiency can be increased by optimizing the surface turned to noise source.

To substantiate choice of sound-suppressing materials we have analyzed and compared reports of the following independent organizations: Österreichisches Forschungs- und Prüfzentrum Arsenal Ges.m.b.H Wien, TAS Schreiner GmbH BTI Bautechnisches Institut Linz, TAS Bauphysik GmbH Leonding, Magistrat der Stadt Wien Magistratabteilung 39-VFA Versuchs- und Forschungsanstalt der Stadt Wien, Staatliche akkreditierte physilkalisch-technische Versuchsanstalt für Wärme- und Schalltechnik am Technologischen Gewerbemuseum Wien, test centre “Ecological safety and labour protection” of Saint Petersburg State university of communications. The analysis results are represented in the table below.

Table

Results of noise insulating properties analysis

Type of noise insulating construction	Surface material	Noise absorption	Air noise insulation
Composite panels	concrete	11dB	19-32 dB
Perforated metal sandwich-panels «Bongard» (Germany)	metal	7,3-16,4 dB	25-35 dB
Wood-concrete panels «Durisol» (Austria)	wood chips	8-19 dB	31-59 dB

The analysis has shown that the panels produced according to the technology of Austrian company Durisol have advantages over the rest of materials used for noise insulation.