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Measurement of Sound Pressure Contributions in Pass-By-Noise Tests Using Particle Velocity Sensors

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In conventional pass-by-noise tests, the vehicle noise emission level is determined with a microphone at a specified distance from a test track while the vehicle drives by. Although these tests off er a simple approach to assess the overall performance, they do not yield information about the sources of noise distributed across the vehicle. Methods to determine the influence of local excitations can be useful for manufacturs attempting to apply an effective noise reduction treatment.

Acoustic beamforming methods can be applied at high frequencies for moving structures to locate noise, but they have difficulties quantifying the impact of each source on the sound pressure next to the test track.

In this paper, a method is presented to determine the sound pressure contributions using a panel noise approach based on direct measurements of particle velocity. The sound pressure contribution for separate car positions is calculated by combining the sound radiation and the acoustic transfer path. The time-averaged result, representing the sound radiated from a vehicle driving by, is ultimately obtained by spatially averaging the contributions at these positions.

To validate the methodology, a measurement was performed with a set of loudspeakers mounted on a car. The measurement method and test results are presented, and the advantages and limitations of the novel method are discussed.
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Document Type: Research Article

Publication date: January 1, 2016

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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