Acoustic absorbent high-temperature sound absorption performance test apparatus

A technology of sound-absorbing materials and testing devices, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, etc., can solve the problems of not being able to test the sound-absorbing performance of sound-absorbing materials in high-temperature fields, and achieve the effects of simple structure, easy manufacture, and ingenious structure

Inactive Publication Date: 2008-07-09
XI AN JIAOTONG UNIV
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Problems solved by technology

[0006] The present invention aims at the problem that the prior art cannot test the sound absorption performance of sound-absorbing materials in high-temperature fields, and

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  • Acoustic absorbent high-temperature sound absorption performance test apparatus

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] As shown in Figure 1 and Figure 2, a high-temperature sound-absorbing performance testing device for sound-absorbing materials includes an impedance tube system and a heating and cooling system, wherein: the impedance tube system includes an impedance tube 12 made of stainless steel tubes, installed in the impedance The test piece cylinder 2 at one end of the tube, the sound source speaker 10 installed at the other end of the impedance tube, the speaker 10 is connected to the signal generator (generating white noise signal) through an amplifier, three holes are opened at different positions on the wall of the impedance tube, and Three microphone jacks 5 are installed, and the jacks are in the form of cones, and the front opening is matched with the outer diameter of the microphone to ensure sealing. This structure is convenient for the i...

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Abstract

The invention discloses a high-temperature sound absorption performance test device of a sound absorption material, comprising an impedance tube, a test piece cylinder disposed on one end of the impedance tube for arranging a test piece, a sound source arranged on the other end of the impedance tube, and microphones disposed on the inner wall of the impedance tube close to the test piece cylinder, wherein the microphones are connected with a computer through a spectrum analyzer and the sound source is connected with a signal generator through an amplifier. The invention is characterized in that a majority of the impedance tube is disposed in a heating furnace in the axial direction from the test piece cylinder; a small part of the impedance tube from the end connected with the sound source is disposed in a cooling device in the axial direction; a heat-insulation plate is disposed on the end of the furnace close to the cooling device; the other end of the furnace includes the test piece cylinder and can divide the furnace into two sections through a connector; a plurality of microphone jacks are provided on the middle section of the furnace; the microphones are disposed on the inner wall of the impedance tube through the jacks; a furnace chamber is arranged in the furnace; a heater is disposed in the furnace chamber; and a temperature controller with a temperature measuring thermocouple connected with the heater is disposed in the vicinity of the test piece.

Description

technical field [0001] The invention relates to a sound-absorbing performance testing device of a sound-absorbing material, in particular to a high-temperature-field sound-absorbing performance testing device of a sound-absorbing material. Background technique [0002] The sound absorption performance of materials is often expressed by the sound absorption coefficient. There are two main methods for measuring the sound absorption coefficient of materials at room temperature: the reverberation chamber method and the impedance tube method. The reverberation chamber method can measure the sound absorption coefficient and the sound absorption of a single object when sound waves are randomly incident. This method requires a large sample area, and the measured sound absorption coefficient and sound absorption can be used in acoustic design engineering, but the test cost is high and the measurement cycle is long, so it is not suitable as a reference measurement method for experime...

Claims

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Application Information

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IPC IPC(8): G01N29/11
Inventor 陈花玲陈天宁冯凯沈飞翔张波孙富贵
Owner XI AN JIAOTONG UNIV
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