Δημοσιεύσεις σε επιστημονικά περιοδικά

Constant exposure to traffic noise pollution can have significant impact on human health and well being. Occupants of high-rise buildings along noisy traffic arteries are severely affected. In an attempt to contribute to noise protection design of prospective high-rise buildings, traffic noise measurements and prediction using the CRTN (calculation of road traffic noise) model, were made along the façade of a high-rise building in central Athens. The aim was to test the accuracy of this model in predicting the vertical distribution (mapping) of traffic noise along such building façades, under the local urban characteristics of the Mediterranean capital. The predicted and measured noise levels were found to be highly coherent with each other, and their vertical distribution pattern, by and large, confirmed findings from earlier studies. Nevertheless, the predicted values had a tendency of underestimation, with a mean difference -2.2 dB(A) with reference to measured values. It is considered that this underestimation is associated mainly with a newly proposed feature of urban morphology, namely (local) geo-morphology. By and large, it can be inferred that the CRTN model is a useful tool, suitable for the prediction of traffic noise along high-rise building façades during their planning and design stage. The results represent a further step towards more general application of this model, as well as a contribution to the use of this model considering a wider number of urban features.

The scope of this study is to investigate flanking noise transmission through joints between prefabricated concrete elements in Hellenic school buildings; such joints apparently are non-existent in the wholesome structure of ordinary concrete buildings. Sound insulation measurements were carried out in two prefabricated concrete buildings of the cell type; the latter involves demountable/reusable concrete elements (the cells); in this case, apparently, flanking noise transmission at joints, may be even more pronounced. A sample of seventeen façade and interior partitions of classrooms was tested. Sound insulation was also predicted based on classical theory. Analysis of the measured data confirms, by and large, the satisfactory sound insulation performance of the test partitions, with the exception of composite partitions which involve door and window openings. The latter were identified to be a major source of sound insulation deterioration. The importance of meticulous sealing of joints is demonstrated.

Research in acoustics during the last three decades has been focused on the formulation of design principles for auditoria for classical music.The latest electronic atonal music has also been studied and led to specific design proposals for the interior architecture of auditoriums for this music genre (Stockhausen, 1958). On what concerns contemporary music genres, acousticians were not interested in most of the music genres of the twentieth century (pop, rock, jazz) until very recently. It has been observed that the design of auditoria for all music genres is based solely on the principles of classical music and thus follows empirical rules. Jazz music, which is the subject of the current study, is one of the music genres, the beginning of which was accompanied by great prejudice concerning its social roots.Today prejudice no longer exists, owing in part to the worldwide popularity of jazz music.We talk about a type of music which is not addressed to big crowds, as is classical music, nor to listeners who prefer the energy and the characteristics of pop or rock music. It could be said that in terms of audience size, jazz music is similar to chamber music. The study aims to attain a thorough understanding of the elements that affect both the acoustics of spaces designed for this music genre and its perception by the listeners. On-site measurements of objective parameters of sound followed by subjective evaluation experiments carried out in two case studies allow us to draw valuable conclusions about the factors affecting the acoustic performance of jazz clubs.This is intended to contribute to the evolution of technical know-how on the construction of jazz auditoria.