A magnetic mixing nonlinear detection method for hardness characterization of ferromagnetic materials
A ferromagnetic material, non-linear technology, applied in the direction of material magnetic variables, etc., to achieve the effect of facilitating accurate characterization and reducing influence
Active Publication Date: 2022-04-22
BEIJING UNIV OF TECH
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Problems solved by technology
For the study of the nonlinear effect of dynamic hysteresis mixing, the extraction of frequency-domain characteristic parameters of magnetic mixing signals and the analysis of the sensitivity to early damage of materials are still blank.
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[0042] Below in conjunction with concrete experiment the present invention will be further described:
[0043] The implementation process of this experiment includes the following steps:
[0044] S1. Experimental system setup: according to image 3 The system diagram of the detection device is shown to build an experimental system. The system includes a computer 1 , a signal excitation acquisition board 2 , a power amplifier 3 and a magnetic mixing sensor 4 . Firstly, the computer 1 is connected to the signal excitation acquisition board, which is used to control the excitation of the magnetic mixing signal, that is, the display, analysis and processing of the excitation signal and the detection signal. The output port of the signal excitation acquisition card 2 is connected to the input port of the power amplifier for amplifying the excitation signal. Next, the output end of the power amplifier 3 is connected to the input end of the magnetic mixing sensor 4 for the magnetiz...
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Abstract
The invention discloses a magnetic mixing nonlinear detection method for hardness characterization of ferromagnetic materials. A certain signal acquisition position is selected, the sensor is closely attached to the surface of a ferromagnetic component, and a high and low frequency modulated sinusoidal signal is excited as a mixed The excitation signal is used for magnetic mixing nonlinear detection; the collected magnetic mixing nonlinear signal is processed by the computer; the detection signal sum frequency and difference frequency components and the amplitude of the high frequency fundamental frequency component are extracted to calculate the magnetic nonlinear characteristic parameters. The high and low frequency modulation signal is used for excitation, which avoids the influence of the nonlinear effect of the system resonant frequency on the material nonlinear effect. The detected material magnetic nonlinear effect is sensitive to the change of the mechanical properties of ferromagnetic materials, and can be used for the characterization of the degradation of the early mechanical properties of the material. By analyzing and processing the magnetic mixing signal, the nonlinear factor of the magnetic mixing is used to characterize the hardness change of the material, which is beneficial to the accurate characterization of the mechanical property change of the material.
Description
technical field [0001] The invention relates to a method for characterizing the hardness of ferromagnetic materials, in particular to a method for characterizing the surface hardness of ferromagnetic materials based on magnetic frequency mixing nonlinear technology. The method is applicable to the characterization of the surface hardness of ferromagnetic materials and belongs to the field of nondestructive testing. Background technique [0002] As a high-reliability material, ferromagnetic materials have been widely used in aerospace, petrochemical and machinery manufacturing, such as gears of turbine engines and oil and gas pipelines. During the service of lattice structural components, due to the diversity of the environment (high temperature, radiation, etc.) and the complexity of the load (cyclic thermal load, mechanical load, etc.), the mechanical properties of ferromagnetic materials will gradually degrade, causing various types of The early damage accumulation of the...
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IPC IPC(8): G01N27/80
CPCG01N27/80
Inventor 焦敬品常予李光海吴斌何存富
Owner BEIJING UNIV OF TECH