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Method for measuring material loss factor

A technology of loss factor measurement and loss factor, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., can solve problems such as material loss factor, and achieve the effect of wide application prospects

Active Publication Date: 2014-08-13
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem of measuring the loss factor of soft texture and multi-cavity materials, the present invention proposes a method that can be used for measuring the loss factor of materials on the basis of the wave velocity method and the free attenuation method

Method used

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  • Method for measuring material loss factor
  • Method for measuring material loss factor

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Embodiment Construction

[0037] The test device and method in this embodiment are used to measure the material loss factor of a soft damping layer containing a cavity. The measurement method includes the following steps:

[0038] Step 1: In this embodiment, two steel plates of the same size are used, the length, width and thickness are 1.7m, 1.5m, and 5.5mm respectively, and a layer of 3cm material to be tested is laid on one of the steel plates to form a composite damping plate;

[0039] Step 2: Refer to Image 6 , paste three acceleration sensors on one side of the metal surface of the composite damping plate, the exciter forms excitation points on one side of the metal surface of the composite damping plate, the three measuring points and the excitation point are on a straight line, the test system is as follows Figure 4 shown;

[0040] Will figure 2 The pulse signal with the frequency f shown is input to the vibrator, and the bending wave signals at 3 measuring points on the composite damping ...

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Abstract

The invention discloses a method for measuring a material loss factor, which belongs to the measuring field of material damping characteristics. The method comprises the following steps of preparing two metal plates with same sizes and with same materials, laying one layer of materials to be measured on one metal plate so as to form a composite damping plate, measuring to obtain flexural wave propagation speeds of the composite damping plate and the metal plate at different impulse signal frequencies, calculating the Young modulus ratio e of a damping layer to a metal layer, measuring to obtain a loss factor beta of the composite damping plate structure, and then calculating to obtain the material loss factor eta of the damping layer. The method has the beneficial effects that the measurement of the structure loss factor and the flexural vibration wave speed is combined, so as to measure a self material loss factor of a multi-cavity damping material and overcome the defects on test of the multi-cavity damping material with soft texture and damping effect by other measuring methods, and therefore, the method has a certain engineering value and a broad application prospect.

Description

technical field [0001] The invention relates to the field of material damping characteristic measurement, in particular to a method for measuring material loss factor. Background technique [0002] The methods of material loss factor testing mainly include bending resonance method, free attenuation method, phase method and so on. In actual engineering, there are a large number of damping materials with soft texture and cavities inside, such as various types of anechoic tiles and decoupling tiles used on ships. Since this type of damping material generally contains cavities, it will cause damage to the material. Methods such as bending resonant beam method and phase method with strict shape requirements cannot be used to measure the loss factor of this type of material. The free decay method does not have high requirements on the size and shape of the material, and the loss factor of the structure can be obtained by directly measuring the reverberation time of the structure....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/07
Inventor 张安付盛美萍肖和业
Owner NORTHWESTERN POLYTECHNICAL UNIV
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