Study of a new standardized sound source for noise assessment in building gyms

Gyms have become popular in residential and commercial buildings, responding to the demand for convenience. However, the installation of these spaces in buildings has caused an increase in complaints of impact noise, which affects the acoustics of buildings and the well-being of residents. This study approaches the challenges of the variability of impact noise sources, which compromise the repeatability and reproducibility of acoustic test results. The research builds on a previous authored study, which aimed to identify patterns among impact sources. A new heavy impact source with a standardized and automated drop mechanism was investigated, evolving into the analysis of variability through the coefficients of variation among three noise sources: Sphere, Kettlebell, and Slam Ball, with a focus on greater consistency and standardization. The tests were conducted in accordance with ABNT NBR 10152:2017, on multiple floor systems and buildings. The results highlight the Cast Iron Sphere as the most consistent source, due to its geometry and automation, showing less variability and highlighting its potential suitability for simulating standardized noise in gyms. These findings provide a basis for future discussions on standardizing acoustic test methods.