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国家自然科学基金(61071042)

作品数:2 被引量:6H指数:1
相关作者:谢华蔡飞杨玲玲文玉梅李平更多>>
相关机构:西昌卫星发射中心重庆大学更多>>
发文基金:国家自然科学基金国家高技术研究发展计划更多>>
相关领域:自动化与计算机技术一般工业技术更多>>

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Tunable characteristics of bending resonance frequency in magnetoelectric laminated composites
2013年
As the magnetoelectric (ME) effect in piezoelectric/magnetostrictive laminated composites is mediated by mechanical deformation, the ME effect is significantly enhanced in the vicinity of resonance frequency. The bending resonance frequency (fr) of bilayered Terfenol-D/PZT (MP) laminated composites is studied, and our analysis predicts that (i) the bending resonance frequency of an MP laminated composite can be tuned by an applied dc magnetic bias (Hdc) due to the E effect; (ii) the bending resonance frequency of the MP laminated composite can be controlled by incorporating FeCuNbSiB layers with different thicknesses. The experimental results show that with H dc increasing from 0 Oe (1 Oe=79.5775 A/m) to 700 Oe, the bending resonance frequency can be shifted in a range of 32.68 kHz≤fr≤33.96 kHz. In addition, with the thickness of the FeCuNbSiB layer increasing from 0 μm to 90 μm, the bending resonance frequency of the MP laminated composite gradually increases from 33.66 kHz to 39.18 kHz. This study offers a method of adjusting the strength of dc magnetic bias or the thicknesses of the FeCuNbSiB layer to tune the bending resonance frequency for ME composite, which plays a guiding role in the ME composite design for real applications.
陈蕾李平文玉梅朱永
关键词:层压复合材料调谐特性复合材料层合板层合复合材料叠层复合材料
高接收信噪比的远距离SAW传感系统研究被引量:6
2013年
远距离的声表面波传感系统具有广泛的应用前景。为增加查询距离,需提高接收通道回波信噪比。针对接收通道干扰信号与传感响应信号频率一致且难以消除等问题,提出了一种能够在接收期间通过调节发射信号频率改变干扰信号与响应信号频率差,以频率不同抑制干扰信号,进而提高信噪比的方法。设计并测试了实验系统。实验结果表明,该方法能有效提高回波信号信噪比10.68 dB,实测查询距离大于16 m。该方法为远程无源无线传感测量提供了保证,具有实际应用价值。
李平谢华文玉梅蔡飞杨玲玲
关键词:声表面波谐振器
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