Studies conducted up to the present moment by researchers around the world show that the evaluation of impact noise depends both on the combined system of floor and on the type of impact source used in measurements. This implies that a particular solution for reducing the impact sound pressure level could work with great efficiency when using a tapping machine and not work so well when using a different impact noise source. The objective of this study is to discuss the performance of materials against the standardized and non-standardized source, determining which of two types of sources is most efficient in simulating real cases. Results of groups measured with the non-standardized source show that all materials behave similarly and do not represent a wide range of options to solve heavy impact noise real problems as results measured with the tapping machine suggest.

In order to develop a subjective evaluation to assess the annoyance related to impact noise, it is necessary to record samples of sounds in an impact chamber that is acoustically representative for ordinary rooms, especially with respect to reverberation time. To define the target reverberation time measurements were carried out in 30 typical residences in Southern Brazil. This study presents the characteristic reverberation times of 30 furnished living rooms and 30 furnished bedrooms in buildings and houses with an average age of 34 years, 40% of them with wooden floor coverings, not as usual in modern constructions. The median T30 at 1 kHz for living rooms with an average volume of 63.60m³ (std dev: 18.27m³) was 0.68 s (std dev: 0.14 s), thus higher than the reference TR = 0.5 s according to EN ISO 140 parts 4, 5, and 7. The median T30 at 1 kHz for bedrooms with average volume of 33.76m³ (std dev: 8.38m³ ) was 0.49 s (std dev: 0.13 s), nearly exact the reference TR according to EN ISO 140 parts 4, 5, and 7. Data will also be compared to studies from other countries.

Este trabalho compreende uma revisão sistematizada de literatura, que tem como objetivo geral verificar como o impacto da pandemia de Covid-19 na qualidade de vida urbana está sendo tratado na literatura científica presente. Os dados para a pesquisa foram coletados no Portal de Periódicos Capes, utilizando uma string de pesquisa que continha as palavras-chave “qualidade de vida urbana”, “impacto” e “pandemia de Covid-19” e suas variantes, e um filtro temporal do período 2020 a 2022. Concluiu-se que o conceito de qualidade de vida urbana é amplo e multidimensional e sua operacionalização depende do recorte que o estudo pretende abordar.

No abstract

This study aimed to verify the performance of different materials used as impact noise insulation when excited by different impact sources. The method applied consisted of several acoustic measurements, following the standards' instructions and using different impact sources, such as the tapping machine and an impact tire. When using the tapping machine results indicate rather big differences in noise insulation performance for the different materials, showing a range from 50 to 76 dB for the Weighted Standardized Impact Sound Pressure Level while measurements with the tire showed a range of 72 to 82 dB for the Average Maximum Impact Pressure Level, meaning very similar noise insulation for all materials.