Avaliação de propriedades dinâmicas de uma coluna de fachadas de vidro sob diferentes percentagens de preenchimento com material de absorção sonora

Abstract

Noise, an unwanted and bothersome sound, can propagate through the air or solid mediums. In buildings with fully glazed facades, known as glass skin, a common problem arises: the transmission of noise between floors through the columns of the glass facade structure.Faced with this challenge, professionals in the window industry often resort to filling the columns with various materials in an attempt to solve the problem. However, this practice lacks scientific backing regarding its effectiveness. Through the analysis of the natural frequency of vibrations and modal analysis of the element, it is possible to collect data that prove the validity of this column filling technique. At the Acoustics Laboratory of the Federal University of Santa Maria, an experimental modal analysis was conducted on a column used in the structure of glass facades, specifically in the Stick type Structural Glazing system, responsible for conducting noise through its section. The experiment involved supporting the profile to be analyzed and marking three axes on the profile section for wave propagation. Eight points were marked along the 650-centimeter length of the profile, with eight rounds of testing per point, totaling 24 impacts validated by the software at each marked point. Using equipment capable of producing and capturing controlled vibrations, the data were transferred to software that analyzed them, identifying prominent frequencies. Thus, parameters were established to determine if the introduction of absorbent material, such as PET wool, inside the column can mitigate the noise transmitted by it. The analysis parameters include the vibration frequency of the element and the damping rate resulting from partial or total profile filling.