Acoustic absorbent high-temperature sound absorption performance test apparatus

Abstract

The invention discloses a high-temperature sound-absorbing performance testing device for sound-absorbing materials, which comprises an impedance tube. A microphone is provided; the microphone is connected to a computer through a spectrum analyzer; the sound source is connected to a signal generator through an amplifier; it is characterized in that most of the impedance tube axially from the test piece cylinder is placed in a heating furnace body, and the impedance tube The small part from the end connected to the sound source in the axial direction is placed in a cooling device; the end of the furnace body close to the cooling device is provided with a heat shield, and the other end of the furnace body contains the test piece tube and the furnace body can be disassembled through the connecting piece It is divided into two parts; several microphone jacks are set in the middle of the furnace body, and the microphones are placed on the inner wall of the impedance tube through the jacks; a furnace is set in the furnace body, a heating body is set in the furnace, and a temperature measuring thermocouple is installed near the test piece to connect Temperature controller for controlling the heating body.

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...

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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 provides a device capable of testing the sound-absorbing performance of sound-absorbing materials under different temperature field conditions from room temperature to 500°C

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