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【期刊论文】New Developments in Structural Health Monitoring Based on Diagnostic Lamb Wave
袁慎芳, Shenfang YUAN+, Yingdi XU, and Ge PENG
,-0001,():
-1年11月30日
Structure health monitoring based on diagnostic Lamb waves has been found to be one of the most promising techniques recently. This paper has a brief review of the new developments on this method including the basic novel of the method, fundamentals and mathematics of Lamb wave propagation, narrowband and wideband Lamb wave excitation methods, optimization of excitation factors and diagnostic Lamb wave interpretation methods.
structural health monitoring,, Lamb wave methods,, factor optimization,, damage localization
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袁慎芳, 陶宝祺
实验力学,1996,11(1):30~37,-0001,():
-1年11月30日
本文介绍了一种强度型操作自诊断自适应适智能复合材料结构的研究情况。这种智能材料基于电阴应变丝为传感无件,形状记忆合金为动作元件。为使结构具有高的灵敏度及诊断精度,文中研究了传感元件的布置方案,提出了四点布置传感无件的方法。同时采用了形状头记忆合金为动作元件。在自诊断出损伤后,对相应的SMA激励,以减小操作或防止其扩展。
智能材料结构,, 自诊断自适应,, 布置方案,, 应力分析。
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袁慎芳, 王磊, 朱安华
,-0001,():
-1年11月30日
目前,复合材料主要是以蜂窝结构的形式应用于飞机结构中。本文将应力波因子(SWF)技术与智能材料结构技术相结合,对蜂窝夹芯复合材料的损伤实现在线、主动监测。本文提出了先将应力波的时域波形微分后再进行傅立叶变换的方法;验证了应力波在蜂窝夹芯复合材料中传播时,其峰—峰值随距离增大呈指数衰减,并提出一种基于最小二乘法的新型应力波因子技术,可有效的剔除传播距离对信号峰—峰值的影响,提高了损伤判别的可靠性和准确性。
蜂窝夹芯结构, 应力波因子, 主动监测
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袁慎芳, 李向华, 王鑫伟, 黄睿
,-0001,():
-1年11月30日
对于埋入光纤后的3-D编织复合材料结构进行了力学建模,介绍了光纤埋入编织材料结构的编织方法、工艺和走向,构建了含光纤部分编织复合材料结构的内胞模型,分析了光纤与纱线及内胞的相互几何关系,并采用有限多相元法建立含光纤3-D编织复合材料结构的本构关系,理论计算结果与实验结果的相一致验证了光纤编入3-D编织复合材料结构中提高检测结构内部参数方法的可行性。
3-D编织复合材料结构, 光纤, 有限多相元法, 内胞, 纱线
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袁慎芳, Y.J. Rao a, *, S.F. Yuan b, X.K. Zeng a, D.K. Lian b, Y. Zhu a, Y.P. Wang a, S.L. Huang a, T.Y. Liu c, G.F. Fernando c, L. Zhang d, I. Bennion d
Optics and Lasers in Engineering 38(2002)557-566,-0001,():
-1年11月30日
Simultaneous strain and temperature measurement for advanced 3-D braided composite materials using fibre-optic sensor technology is demonstrated, for the first time. These advanced 3-D braided composites can virtually eliminate the most serious problem of delamination for conventional composites. A tandem in-fibre Bragg-grating (FBG)/extrinsic Fabry-Perot interferometric sensor (EFPI) system with improved accuracy has been used to facilitate simultaneous temperature and strain measurement in this work. The non-symmetric distortion of the optical spectrum of the FBG, due to the combination of the FBG and the EFPI, is observed for the first time. Experimental and theoretical studies indicate that this type of distortion can affect the measurement accuracy seriously and it is mainly caused by the modulation of the periodic output of the EFPI. A simple method has been demonstrated to improve the accuracy for detection of the wavelength-shift of the FBG induced by temperature change. A strain accuracy of ~±20με and a temperature accuracy of B711C have been achieved, which can meet the requirements for practical applications of 3-D braided composites.
Strain and temperature measurement, Delamination, Measurement accuracy
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