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Method and apparatus for measuring ferromagnetic material stress

A ferromagnetic material and stress technology, applied in the field of detection, can solve the problems of high power consumption of the sensor, long measurement cycle, and bulky test equipment, and achieve the effect of shortening the duration and reducing the power load.

Active Publication Date: 2009-07-29
杭州自动化技术研究院有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the disadvantages are that the measurement cycle is too long, the sensor consumes too much power, and the test equipment is bulky

Method used

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  • Method and apparatus for measuring ferromagnetic material stress
  • Method and apparatus for measuring ferromagnetic material stress
  • Method and apparatus for measuring ferromagnetic material stress

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Embodiment Construction

[0016] The method and device of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] The pulse current supplied to the excitation coil (1) during the measurement is composed of two sets of pulse currents connected in time sequence, such as figure 1 as shown ( figure 1 The abscissa T represents time, and the ordinate I 1 Indicates the current fed to the excitation coil), one group is the alternating current pulse [3] whose amplitude gradually decreases to zero, and the other group is the pulsating current synthesized by the linear superposition of the rectangular wave current pulse and the equal-amplitude sine wave current Pulse[4], such as figure 2 as shown ( figure 2 The abscissa T represents time, and the ordinate I 2 Represents the pulse current synthesized by the linear superposition of rectangular wave current pulse and equal-amplitude sine wave current), or the pulsating current pulse synthe...

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Abstract

The invention discloses a method and device for measuring the stress of ferromagnetic material. A magnetic field is generated in an excitation coil by current so as to lead a measured object to be magnetized and obtain information on stress according to the change of average magnetic permeability of a magnetic circuit. Two groups of pulse current in timing connection are fed into the excitation coil, wherein one group is alternating current with the amplitude attenuated and the other group is unipolar pulse current with the amplitude fluctuated; an induction coil outputs a voltage signal which relates to the stress of the measured material; and a measurement device includes a timing pulse current generator and a pulse voltage signal processor. The measurement cycle for the stress of ferromagnetic material can be shortend, the power consumption of a measuring system can be lowered, the volume and weight of test equipment can be reduced, and the online stress measurement of various steel products can be ahieved, such as non-contact measurement used for suspension bridge wire rope bearing, dynamic wire rope loading of lifting equipment, torque and shaft of transmission systems, stress distribution of building structures, etc.

Description

technical field [0001] The invention belongs to detection technology, in particular to a method and device for measuring the stress of ferromagnetic materials. Background technique [0002] At present, the typical technology for measuring the internal stress of ferromagnetic materials (such as shafts made of low carbon steel, steel bars and steel cables, etc.) is to use AC power to supply power to the excitation coil surrounding the magnetic circuit of the measured object, and generate and The voltage signal proportional to the change rate of the magnetic induction intensity inside the measured object is obtained after integral operation. The voltage signal proportional to the magnetic induction intensity is obtained by using computer technology to analyze the functional relationship between it and the excitation current and calculate the magnetization process. The magnetic permeability of the measured object is used to measure the internal stress of the measured object acco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/72G01R33/12
Inventor 张开逊徐赤卜琰刘军
Owner 杭州自动化技术研究院有限公司
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