| 刘 欣,封 皓,杨 洋,赵亚丽.基于 J-A 力磁耦合模型的压力磁测系统研究[J].电子测量与仪器学报,2021,35(4):232-238 |
| 基于 J-A 力磁耦合模型的压力磁测系统研究 |
| Research on pressure magnetic measurement system based onJ-A model of force-magnetic coupling |
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| DOI： |
| 中文关键词: 压力 耦合模型 磁测 灵敏度 |
| 英文关键词:pressure vessel magnetomechanical effect magnetic measurement sensitivity |
| 基金项目:河北省科技厅项目（19275401D）、承德市高新区项目（360210）资助 |
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| 中文摘要: |
| 提出了基于磁机械效应的在役容器压力测量方法,利用磁信号与器壁应力之间存在稳定对应关系,实现非侵入无损检
测。 采用 J-A 力磁耦合模型分析了弱地磁环境下钢材磁导率和应力的关系,在理论上证明了利用容器外部磁场测量内部压力
的可行性。 设计了一套多通道磁信号同步采集系统,能够完成多传感器 3 个分量的磁信号的同步获取,实验验证了本方法的性
能和优势。 实验表明,在压力设定范围内,容器附近磁场与内部压力符合线性模型。 压力容器表面的不同部位的磁场对压力变
化的灵敏度差别较大,因此需要多点布置、标定优选。 对于实验的低碳钢压力容器,磁场测量灵敏度可达 131. 4 mGs/ MPa,并通
过轴对称布置一对传感器叠加,可以减弱旋转容器对测量精度的影响。 |
| 英文摘要: |
| A pressure measurement method for in-service vessel based on magneto-mechanical effect is proposed. Non-intrusive and noncontact pressure measurement are realized by using the stable correspondence between magnetic signals outside the vessel and the stress
on the vessel wall. The relationship between magnetic permeability and stress of steel in weak geomagnetic field is analyzed by using J-A
coupling model, and the feasibility of using external magnetic field of vessel to measure internal pressure is theoretically proved. A multichannel synchronous magnetic signal acquisition system is designed, which can simultaneously acquire the magnetic signals of three
components of the multi-sensor. Experiments are carried out to verify the performance and advantages of this method. The results show
that in the range of 0~ 3 MPa, there is a good linear relationship between the magnetic field near the surface and the internal pressure of
the vessel. The sensitivity of the pressure change of the magnetic field at different parts of the vessel surface is different, so multi-point
deployment and calibration optimization are required. For low carbon steel pressure vessel with an outer diameter of 275 mm and a wall
thickness of 7. 5 mm, the sensitivity of magnetic measurement can reach up to 131. 4 mGs/ MPa. Via axis-symmetrically arranging a pair
of sensors and adding their output up, the influence of rotating vessel on measurement accuracy can be significantly weakened. |
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