8607 | Create detailed noise maps quickly Micro Hon Array
Hottinger Brüel & Kjær

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Model Description

■ 8607 Sound Holographoraf NEAR-FIELD ACOUSTIC HOLOGRAPHY (NAH) builds a mathematical model that expresses the sound field based on a set of sound pressure data measured in a very close plane to the sound source. With this model, you can calculate sound field parameters such as sound pressure, sound intensity, and particle speed in the target plane parallel to the measured plane. Using this model, you can calculate the response of the long -distance field, and in that case, the sound pressure distribution in long -distance sites is estimated based on the Helmholtz integration equation (HIE). Further noise reduced schemes can be applied to evaluate the effects of various source reductions. Calculation algorithms are statistical optimization near-range area range field sound holography (Statistically Optimied Near-Field Acoustical Holography, SONAH) and equivalent sound source laws (Equivalent Source Method, ESM). You can use two. SONAH's calculation method allows you to overcome the following restrictions that could not be avoided with conventional NAH calculation. ・ In order to avoid the impact of spatial windows, the measurement surface must be covered by areas larger than the entire noise source. ・ The measurement grid must be a rectangle / square of equal intervals to perform space FFT calculation. SONAH can use irregular arrangements, and even if it is a small array than the measured target sound source, it can be measured without greatly affected by the spatial window. The equivalent sound source law (ESM) is suitable for large unevenness on the sound source surface. You can remove the adverse effects that aren't flat on SONAH. Therefore, when applying a panel contribution analysis, intensity component analysis, and on -site sound absorbing measurement, use ESM. ■ Measurement and analysis The standard NAH measurement is performed by scanning the sound source using a finite size grid array and positioning system robot. The reference signal is also measured at the same time to maintain the absolute phase relationship between the scanning position. When measuring transient sounds, usually use a large array and use it to measure all measurements at the same time.

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• Part Number

  8607

• Product

  Create detailed noise maps quickly Micro Hon Array

• Handling Company

  Hottinger Brüel & Kjær

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