大量程磁致伸缩位移传感器的应力波衰减特性研究
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河北工业大学 电磁场与电器可靠性省部共建重点实验室天津300130

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TP212TH711

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国家自然科学基金(51171057)、河北省自然科学基金(E2017202035)、天津市高等学校科技发展基金计划(20140421)项目资助


Analysis of stress wave attenuation property of largescale magnetostrictive displacement sensor
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ProvinceMinistry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability,Hebei University of Technology, Tianjin 300130, China

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    摘要:

    为研制大量程磁致伸缩位移传感器,对应力波的能量衰减特性进行研究。提出了衰减系数测试方法,给出了衰减系数的计算表达式及其修正方法。搭建了磁致伸缩位移传感器实验平台,测试了应力波在FeGa和FeNi波导丝中传播的衰减系数,确定了波导丝线径、应力波频率和波导丝所受应力对衰减系数的影响规律。结果表明,线径为0.6 mm的FeGa和FeNi波导丝在不受应力作用时,频率54 kHz的应力波衰减系数分别为0.154 8 Np·m-1和0.180 8 Np·m-1;衰减系数随波导丝线径的增大而增大;衰减系数随应力波频率的增大而增大;衰减系数随波导丝所受应力的增大先减小后趋于稳定。在设计大量程磁致伸缩位移传感器时,为减小应力波的衰减,可选择线径为0.4 mm的FeGa波导丝、应力波频率为32 kHz、波导丝所受应力60 MPa。

    Abstract:

    To develop largescale magnetostrictive displacement sensor (MDS), the energy attenuation of stress wave is studied. A novel test method of attenuation coefficient is proposed in this work, in which the expression of attenuation coefficient and its correction method are involved. The experimental platform of MDS is set up to test the attenuation coefficients of the stress wave propagating in FeGa and FeNi waveguides. Moreover, the effects of wire diameter, stress wave frequency and stress on the attenuation coefficient are analyzed and determined. Experimental results show that the stress wave attenuation coefficients of FeGa and FeNi waveguides with 0.6 mm wire diameter are 0.154 8 Np·m-1 and 0.180 8 Np·m-1, respectively, under 54 kHz and in the absence of stress. The attenuation coefficient increases as the wire diameter and the frequency of stress wave increases. The attenuation coefficient decreases first and then trends towards stability as the stress increases. Therefore, to reduce the attenuation of the stress wave in the production of a largescale MDS, the diameter of FeGa waveguide wire, stress wave frequency and stress are 0.4 mm, 32 kHz and 60 MPa, respectively.

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王博文,谢新良,张露予,李亚芳,郑文栋.大量程磁致伸缩位移传感器的应力波衰减特性研究[J].仪器仪表学报,2017,38(4):813-920

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  • 在线发布日期: 2017-07-19
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