Construção de um tubo de impedância para análise de materiais usados na construção civil

Abstract

There are several materials, whose different manufacturers do not provide all the necessary acoustic characteristics to carry out an adequate dimensioning for the environment where they will be applied, this ends up being a challenge encountered by professionals in the field of civil construction. So this work, seeking to find a solution to determine the main properties unbearable to a good acoustic dimensioning, with an accessible cost, developed a device commonly known as impedance tube, where it will apply sound waves in the material to be tested and from the difference between the waves captured by the microphone, making it possible to determine the acoustic characteristics of this material. Therefore, the present work presents how the dimensioning of this instrument was done until reaching the values of a loudspeaker with a volume of 30 liters, using two microphones of the brand PCB model 130E22, a PVC tube of 50mm in diameter and 485mm in length, a focusrite audio interface and a sample with its standardized acoustic characteristics and provided by the OWA sonex company. So with the use of the matlab plugin “ITA-TOLLBOX” to process the collected data.