Impedance tube sound source device and impedance tube testing device

By designing the impedance tube sound source device of the hollow structural bracket and vibration damping sleeve, the structural sound impact problem caused by the direct contact between the speaker and the impedance tube wall is solved, the accuracy of the measurement results is improved, and the speaker is easy to install and disassemble.

CN222674442UActive Publication Date: 2025-03-25GUANGDONG KERUI NEW ACOUSTIC TECH CO LTD
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Patent Information

Application Number
CN202421353494.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-13
Publication Date
2025-03-25
Estimated Expiration
2034-06-13

AI Technical Summary

Technical Problem

In the impedance tube test experiment, when the speaker is in direct contact with the impedance tube wall, the structural sound generated will affect the test results, especially in the low frequency band, the coherence coefficient of the microphone is reduced, and the material sound absorption coefficient and transmission loss curve of the measured result appear large jitter. At the same time, the speaker is not fixed firmly and is inconvenient to disassemble and assemble.

Method used

An impedance tube sound source device is designed, adopting the first and second brackets with hollow structures, and a vibration damping sleeve is set on its outer periphery. The speaker is clamped and installed between the brackets. The vibration damping sleeve is fed with the inner wall of the impedance tube to achieve buffer installation and vibration damping effects.

Benefits of technology

By separating the speaker from the impedance tube wall and installing vibration-absorbing materials in the gaps, the impact of structural sound on the measurement results is weakened, the accuracy of the measurement results is improved, and the installation and disassembly of the speakers is simplified.

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Abstract

The utility model discloses an impedance tube sound source device and an impedance tube testing device, the impedance tube sound source device comprises a loudspeaker, a first support and a second support, the periphery of the first support is sleeved with a first vibration reduction sleeve, the periphery of the second support is sleeved with a second vibration reduction sleeve, and the loudspeaker is clamped and installed between the first support and the second support. When the sound source device is used, a loudspeaker is clamped and fixedly installed between the first support and the second support to form a body of the sound source device, when an experiment is carried out, the first support and the second support are sleeved with the first vibration reduction sleeve and the second vibration reduction sleeve respectively, and the body of the sound source device is sleeved and fixed in the impedance tube through the first vibration reduction sleeve and the second vibration reduction sleeve. The first vibration reduction sleeve and the second vibration reduction sleeve play a role in supporting and fixing, and play a role in buffering installation of the loudspeaker and the impedance tube, play a role in vibration reduction, improve the precision of a measurement result, and facilitate the assembly and disassembly of the loudspeaker.
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