Sound Source Characterisation and Transfer Path Analysis with Time Histories

Document identifier: oai:DiVA.org:ltu-76689
Access full text here:10.20855/ijav.2003.8.3142
Keyword: Engineering and Technology, Mechanical Engineering, Fluid Mechanics and Acoustics, Teknik och teknologier, Maskinteknik, Strömningsmekanik och akustik, Teknisk akustik, Engineering Acoustics
Publication year: 2003
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SDG 11 Sustainable cities and communities
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Abstract:

The article describes a method to separate time histories of partial sound sources. The goal is to develop a noise control engineering tool for use in sound quality improvement applications. Contributions from partial sound sources are identified. The partial sound sources may be ranked for the purpose of creating a better mixture of sound in selected listening positions. The strategy is to reproduce time histories of sources of importance. The method described includes experimental and calculation parts. The experimental part consists of the recording of sound pressure time signals, reciprocal measurement of frequency response functions, and source strength esti- mation of partial sound sources. The calculation part comprises calculation of the cross-spectral matrix of source strength, calculation of filters, and filtered sound pressure recording to obtain time signals of the individual sources. Usually the contribution from partial sources is impossible to record directly. In this laboratory experi- ment, such control was possible. The laboratory experiment shows that the method described makes it possible to produce informative separation of time histories of partial sound sources. The effects of the errors in the cal- culated time histories are audible but not pronounced.

Authors

Nicklas Frenne

Luleå tekniska universitet
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Örjan Johansson

Luleå tekniska universitet; Drift, underhåll och akustik
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