Device and method for measuring sound reduction index of acoustic material by adopting pulse method

A technology of acoustic materials and sound insulation, applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve cumbersome and unpopular problems, achieve the effects of improving measurement accuracy, overcoming influence, and avoiding secondary errors

Active Publication Date: 2013-05-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The double sound source method requires the loudspeaker to be installed twice, respectively, at the two ports of the sound tube, and the transfer matrix and sound insulation of the material can be obtained through two ...

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  • Device and method for measuring sound reduction index of acoustic material by adopting pulse method
  • Device and method for measuring sound reduction index of acoustic material by adopting pulse method
  • Device and method for measuring sound reduction index of acoustic material by adopting pulse method

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Embodiment Construction

[0026] Describe the present invention below in conjunction with specific embodiment:

[0027] In this embodiment, a measurement experiment of sound insulation is carried out on a 3 cm rubber material.

[0028] The measurement device used in this embodiment includes a sound tube, a pulse sound source, a microphone, a power amplifier, a signal conditioner, an adapter and a data acquisition device.

[0029] The sound tube is composed of a section of large-diameter cylindrical tube, conical tube and small-diameter cylindrical tube, which are connected coaxially in sequence. The material of the sound tube is made of steel. The length of the large-diameter cylindrical tube is 150mm, the length of the conical tube is 200mm, and the small-diameter cylindrical tube is The tube length is 1360mm. The inner diameter of the large-diameter cylindrical tube is the same as the diameter of the pulse sound source. The pulse sound source is installed in the large-diameter cylindrical tube. The ...

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Abstract

The invention provides a device and method for measuring a sound reduction index of an acoustic material by adopting a pulse method. The device comprises a sound tube, a pulse sound source, microphones, a power amplifier, a signal conditioner, an adapter and a data collecting device, wherein the sound tube is formed by sequentially, coaxially and fixedly connecting one section of big-diameter cylinder tube, a conical tube and a small-diameter cylinder tube, three through holes which are vertical to the center axial line of the small-diameter cylinder tube and are used for arranging the microphones are formed in the side wall of the small-diameter cylinder tube, the pulse sound source is arranged in the big-diameter cylinder tube, and a rear cover is connected with the external end of the small-diameter cylinder tube in a threaded manner. The method comprises the steps of: firstly obtaining a frequency response function of the whole measuring system, then obtaining a drive signal frequency spectrum of the required pulse sound source, and finally measuring and driving the pulse sound source by the drive signals of the required pulse sound source to obtain the sound reduction index of a sample to be measured. Compared with a double-loading method and a double-sound source method, the device and method provided by the invention overcome the influence of acoustic impedance of the tail end of the sound tube to a test result.

Description

technical field [0001] The invention relates to the technical field of acoustic material testing, in particular to a device and a measuring method for measuring the sound insulation of acoustic materials using a pulse method. Background technique [0002] In the field of sound tube acoustic testing, the current measurement techniques for sound insulation of acoustic materials mainly include standing wave field decomposition method and transfer matrix method. Among them, the standing wave field decomposition method relies on the decomposition of the sound field inside the sound tube, and there are two main problems it faces: (1) the phase matching problem between multiple microphones, this problem can use one of the microphones as a standard, and Other microphones and their calibration methods are used to solve this problem. If a single microphone is used for point-by-point measurement, this problem does not exist, but the measurement time is longer; (2) The impact of the aco...

Claims

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Application Information

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IPC IPC(8): G01N29/11
Inventor 侯宏孙亮杨建华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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