Near-field acoustical holography testing system in noise environment and application thereof

Abstract

The invention relates to a near-field acoustical holography testing system in a noise environment and application thereof. The system comprises a rigid acoustical shielding cover, a microphone array,a base, a data collection instrument and an upper computer, wherein the microphone array comprises a plurality of sensors; the rigid acoustical shielding cover comprises a bottom surface and four sides; a plurality of holes are discretely formed in the bottom surface; the number of the holes is consistent with that of the sensors; each hole is in one-to-one correspondence to each sensor; the sensors are embedded in corresponding holes in the bottom surface of the rigid acoustical shielding cover and are in flush with the inner surface of the bottom surface; the microphone array, the data collection instrument and the upper computer are successively connected with each other; and the rigid acoustical shielding cover and the microphone array are fixed and supported by the base. Compared withthe prior art, the near-field acoustical holography testing system has the advantage that the noise source surface vibration velocity can be more conveniently rebuilt in the noise environment.

Description

technical field [0001] The invention relates to the field of noise testing, in particular to a near-field acoustic holographic testing system used in a noisy environment and its application. Background technique [0002] Acoustic holography in a non-free field environment can be used for noise source identification at the working site of mechanical equipment, which is very necessary for large-scale or mechanical equipment that cannot be moved into an anechoic chamber. In 2010, M.Aucejo, N.Totaro, J.L.Guyader wrote "Identification of source velocities on 3D structures in non-anechoic environments: Theoretical background" in "Journal of Sound and Vibration" (2010.329(18):p.3691-3708) and experimental validation of the inverse patch transfer functions method". This paper proposes the inverse block transfer function method as a near-field acoustic holography method in a non-free-field environment. By measuring the sound pressure and velocity on the holographic surface surroundi...

AI Technical Summary

Problems solved by technology

However, the measurement of the sound pressure and velocity on the holographic surface surrounding the sound source requires the use of p-u sound intensity probes with scanning equipment, resulting in high cost and low measurement efficiency

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