Abstract
It is a requirement of conventional Near-field Acoustic Holography that the measurement area covers the entire surface of the source. In the case of Patch Near-field Acoustic Holography (patch NAH), the measurement area can be reduced to cover only a specific area of the source
which is of particular interest (known as the “patch” or “source patch”). The area of the source beyond this patch is not of interest in the analysis. However, its acoustic output may nevertheless contribute to the total sound field in the measurement plane, and influence the reconstruction
of the field close to the patch. The purpose of this paper is to investigate how the acoustic radiation from outside the patch area influences the reconstruction of the sound field close to the source. The reconstruction is based on simulated measurements of sound pressure and particle
velocity. The methods used in this paper are the Statistically Optimized NAH (SONAH) and the Equivalent source Method (ESM), also known as the Wave Superposition Method. Particular attention is drawn to how the equivalent sources in the ESM could be distributed in order to
achieve an acceptable reconstruction of the sound field. It has been shown that an acceptable reconstruction
of the normal velocity can be achieved if the contributions from beyond the patch area are accounted for.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Inter-Noise |
| Publication date | 2009 |
| Publication status | Published - 2009 |
| Event | 38th International Congress and Exposition on Noise Control Engineering - Ottawa, Canada Duration: 23 Aug 2009 → 26 Aug 2009 Conference number: 38 |
Conference
| Conference | 38th International Congress and Exposition on Noise Control Engineering |
|---|---|
| Number | 38 |
| Country/Territory | Canada |
| City | Ottawa |
| Period | 23/08/2009 → 26/08/2009 |