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A near-field acoustic holographic test system and its application in noisy environment

A near-field acoustic holography, testing system technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, measurement of propagation velocity, etc., can solve the problems of low measurement efficiency and high cost

Active Publication Date: 2021-07-16
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the measurement of the sound pressure and velocity on the measurement 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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  • A near-field acoustic holographic test system and its application in noisy environment
  • A near-field acoustic holographic test system and its application in noisy environment
  • A near-field acoustic holographic test system and its application in noisy environment

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0041] A near-field acoustic holographic test system for noisy environments, such as figure 1 with figure 2 As shown, it includes a rigid acoustic shield 1, a microphone array 2, a base 3, a data acquisition instrument 4 and a host computer 5, the microphone array 2 includes a plurality of sensors, and the rigid acoustic shield 1 includes a bottom surface and four sides, and the bottom surface A plurality of openings are discretely provided, the number of openings is consistent with the number of sensors, each opening corresponds to each sensor one by one, the sensors are embedded i...

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Abstract

The invention relates to a near-field acoustic holographic testing system and its application in a noisy environment, wherein the system includes a rigid acoustic shield, a microphone array, a base, a data acquisition instrument and a host computer, the microphone array includes a plurality of sensors, and the rigid acoustic shield The cover includes a bottom surface and four sides, and the bottom surface is discretely provided with a plurality of openings, the number of openings is consistent with the number of sensors, each opening corresponds to each sensor, and the sensors are embedded in the bottom surface of the rigid acoustic shielding cover. Corresponding to the opening, and the microphone is arranged flush with the inner surface of the bottom surface, the microphone array, the data acquisition instrument and the host computer are connected in sequence, and the rigid acoustic shielding cover and the microphone array are fixed and supported by the base. Compared with the prior art, the invention has the advantages of being able to reconstruct the surface vibration velocity of the sound source more conveniently in a 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 measurement surface surroundi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00G01H5/00
CPCG01H5/00G01H17/00
Inventor 严莉李豆吴海军蒋伟康
Owner SHANGHAI JIAOTONG UNIV