3D Visualization Research Of Sound Quality Based On Spherical Nearfield Acoustic Holograph

Traditional noise reduction measures are used to reduce radiation acoustic pressure of noise sources, but the latest research shows that sound pressure level reduction doesn’t mean improvement of people’s auditory feeling. Moreover, isolated use of Nearfield Acoustic Holography or sound quality analysis couldn’t reveal the relationship between spatial distribution of sound sources and people’s auditory feeling, and couldn’t give out distribution of sound quality object metrics. Therefore, the guiding function of current sound field measurement analysis methods is very limited. In order to solve above problems, the paper proposes 3D visualization of sound quality object metrics based on Spherical Nearfield Acoustic Holography methodology which could not only obtain the space distribution of sound quality metrics, but also directly reveals the most critical sound source which most deteriorate people’s subject feeling. Finally, this methodology could guide noise reduction design much more efficiently.The detail studies are as follows:1. Give out calculation algorithm of Moore loudness model detailedly, and deduce sharpness estimate algorithm based Moore loudness model.2. Propose the Spherical Nearfield Acoustic Holography-Sound Quality (SNAH-SQ) hybrid methodology which could achieve 3D visualization of sound quality object metrics. Then, two kinds of sound field which contained one or two monopole sound source respectively are used to carry out the algorithm error analysis. Moreover, applicability problem of sound pressure, loudness and sharpness is studied when they are used as standard to identify and locate noise sources.3. Finally, SNAH-SQ methodology is validated in anechoic camber, and test results indicates SNAH-SQ could make 3D visualization of sound quality object metrics come true.