Validation of a 1:8 Scale Measurement Stand for Testing Airborne Sound Insulation.

Agata Szeląg,Katarzyna Baruch-Mazur,Bartosz Przysucha,Dominik Mleczko,Krzysztof Brawata

doi:10.3390/s21196663

Abstract

This paper contains a detailed description of the design and validation of a measurement stand for testing the airborne sound insulation of specimens made at a small scale. The stand is comprised of two coupled reverberation rooms in which the geometry represents the full-size reverberation rooms used at the AGH University of Science and Technology at a 1:8 scale. The paper proves that both the scaled measurement stand and the testing methodology conform to the ISO 10140 standards, and that the obtained measurement uncertainty does not exceed the maximum values specified in ISO 12999-1. Moreover, the calculated uncertainty of measurements obtained for the 1:8 scale stand is comparable with the typical uncertainty given in ISO 12999-1 and the uncertainty obtained on the full-scale measurement stand. In connection with the above, the authors have proved that by using the scaled-down measurement stands, one can obtain reliable and repeatable results of measurements of airborne sound insulation.

Highlights

Tests using scaled-down models allow the significant reduction of the costs of the analysis of selected processes and phenomena occurring in nature
Summary The paper includes a detailed description of the scaled-down stand for measuring the airborne sound insulation using scaled-down specimens
The stand validation results were presented in the context of the reliability and repeatability of measurement results obtained on this stand

Summary

Introduction

Tests using scaled-down models allow the significant reduction of the costs of the analysis of selected processes and phenomena occurring in nature. Examples of sound insulation tests of real specimens with the use of small coupled twin reverberation rooms are presented in the literature [17]. The purpose of the research presented in this paper was to build a scaled measurement stand for testing the airborne sound insulation of scaled specimens that meets all standard procedures dedicated to full-size laboratory stands. In contrast to the scaled measurement stands presented so far in the literature, our stand is to be fully compliant with the ISO 10140 guidelines and the uncertainty of obtained results will not exceed the maximum values specified in ISO 12999-1 This ensures the reliable and repeatable measurement results of airborne sound insulation performed on the studied stand. It is planned to use the stand for further research in order to define the precise criteria of similarity between the scaled model and the real system for testing the sound insulation of various scaled specimens. The obtained uncertainty values are compared with the requirements of ISO 12999-1, which specifies the maximum and typical uncertainty values obtained during the tests of airborne sound insulation

The Scaled Measurement Stand in the Context of ISO 10140 Requirements

Uncertainty of Measurements—Comparative Analysis of the Tested Stands