Device for testing sound absorption performance of porous metal material under variable parameter temperature field

A technology of porous metal and testing device, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of high testing cost and large area of ​​test pieces.

Inactive Publication Date: 2011-06-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires a large sample area and high test cost, so it is not suitable as a conventional experimental test method.

Method used

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  • Device for testing sound absorption performance of porous metal material under variable parameter temperature field
  • Device for testing sound absorption performance of porous metal material under variable parameter temperature field
  • Device for testing sound absorption performance of porous metal material under variable parameter temperature field

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0022] See figure 1 , 2 , A testing device for the sound absorption performance of porous metal materials in a variable parameter temperature field, comprising a speaker 1, an impedance tube 2, a heat preservation heating body 5, a test piece heating body 9 and a microphone probe; the low temperature zone of the impedance tube 2 (fixed method The end of the flange 16 is provided with a speaker 1, which is used to generate white noise signals; the middle of the high temperature zone of the impedance tube 2 (the right side of the fixed flange 16) is provided with a heat preservation heating body 5 to ensure the inside of the impedance tube 2 The temperature field in the area close to the test piece is uniform; a microphone probe hole is provided between the heat shield 8 of the high temperature zone of the impedance tube 2 and the heat preservation heating body 5, ...

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Abstract

The invention discloses a device for testing sound absorption performance of a porous metal material under a variable parameter temperature field. The testing device is used for testing sound absorption coefficients of the material under the variable parameter temperature field by using a specially designed structural device and a temperature control system as cores by means of transfer function method principle. The parameter change of environmental temperature required by a test piece can be realized by adjusting an electric heating temperature control system with the assistance of reasonable collocation of a water cooling system, the environmental temperature filed of the test piece of the tested material can be adjusted in a range of between room temperature and 600 DEG C, and the axial temperature gradient inside the test piece can be adjusted in a range of between 0 and 300 DEG C. The temperature evenness of each point on an inner section of an impedance tube is ensured so that the plane wave generated by a loudspeaker does not produce distortion during transmission; and the change of sound pressure signals in the impedance tube is measured by a high-temperature microphone, and the test data are acquired and processed by a data acquisition device and a microcomputer so as to obtain the sound absorption coefficients of the tested material. The testing frequency range of the device is related to the parameters of the impedance tube.

Description

Technical field: [0001] The invention belongs to the field of mechanical engineering, and relates to a test device for the sound absorption performance of a material, in particular to a test device for the sound absorption performance of a porous metal material under a variable parameter temperature field. Background technique: [0002] Ultra-light porous metal is a new type of multi-functional material that has emerged with the development of material preparation and forming processing technology in recent years. Porous metal has ultra-light (porosity> 90%), high specific strength, high specific stiffness, and high strength. Excellent mechanical properties such as toughness and high energy absorption, as well as special properties such as shock absorption, heat dissipation, sound absorption, electromagnetic shielding, and excellent permeability. Therefore, it is widely used in high energy-consuming equipment. For example, when porous metal materials are applied to the acoust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
Inventor 陈天宁薛昌意张波奚延辉王小鹏吴钊
Owner XI AN JIAOTONG UNIV
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