Abstract
The sound power level can be estimated using several well-established techniques available in the market. However, the variety of methods can be overwhelming when choosing among them due to environmental restrictions, standard requirements, and the necessary expertise to acquire valid data. In this study, we aim to compare the results obtained with different techniques, either standardized, as described in ISO 3744 in hemi anechoic rooms and ISO 9614-1, engineering method, using sound intensity, and non-standardized microphone array methods, as optimized acoustic beamforming and acoustic holography algorithms. The sound power levels of an omnidirectional sound source with pink noise as input and a printer were measured in a hemi-anechoic chamber using all the techniques. In addition, the measurement with the omnidirectional sound source were carried in a meeting room to check the effect of room and background noise. Considering the results of the sound intensity method as the baseline, all the overall sound power level results varied within the uncertainty stipulated by ISO 9614-1 for both sources. The results in one-third octave bands were within the uncertainty for all bands except one case for both sources in the case of refined beamforming.
Published Version
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