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2 2020

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Modeling of vibroacoustic phenomena using the method of parameterizing the audio signal

Paszkowski Waldemar

Eksploatacja i Niezawodność

2020

Vol. 22, no. 3

501--507

The article proposes an original way of modeling vibroacoustic phenomena of exploited machines/devices using the method of audio parameterization. This method extends the current approach to this type of research and consists in taking into account the psychoacoustic effects associated with the emission of vibroacoustic energy. The proposed solution is based on the determination of mel-cepstral coefficients of the examined signal and its classification, due to the impact of noise. It was presented verification of the method on the example of studies on the impact of road noise sources.

W artykule zaproponowano oryginalny sposób modelowania zjawisk wibroakustycznych eksploatowanych maszyn/urządzeń z zastosowaniem metody parametryzacji sygnału fonicznego. Sposób ten rozszerza dotychczasowe podejście do tego rodzaju badań i polega na uwzględnianiu efektów psychoakustycznych towarzyszących emisji energii wibroakustycznej. Proponowane rozwiązanie opiera się na wyznaczeniu współczynników mel-cepstralnych badanego sygnału i jego klasyfikacji, ze względu na oddziaływanie hałasu. Przedstawiono weryfikację zastosowania metody na przykładzie badań oddziaływania źródeł hałasu drogowego.

Case Study of the Environmental Noise and its Perception in the City of Cluj-Napoca, Romania

Popescu Diana Ioana

Archives of Acoustics

2020

Vol. 45, No. 4

625-631

The noise perceiving issue is very subjective and depends on several factors, such as: the living environment in which each person has grown and developed, the education they have received, the culture in which their life principles have formed and, last but not least, the social and financial status. Therefore, in order to establish effective actions in multiple directions when it comes to any urban noise analysis, it is very important to know the perception and the subjective reactions of the individuals involved. The paper respects this idea, presenting the results of a sociological study on urban noise, applied in the city of Cluj-Napoca, Romania. The intention was to capture the reactions of the permanent residents of the city, but also of the people in transit, as well as to analyse the changes that occurred as result of the implementation of the Environmental Noise Directive (European Commission). The study shows that 75.2% of the respondents consider that the noise in the city has increased in the last ten years and 58% of tchem have rated the noise as level 4 or 5 on a five point scale. Information related to noise maps and actions taken to reduce community noise has no sufficient dissemination. There is also a medium to low reaction of the population in correlation to the declared noise annoyance.