Smart elasto-magneto-electric (EME) sensors for stress monitoring of steel structures in railway infrastructures

Abstract：Steel structures are widely used in railway infrastructures.Their stress state is the most important determinant of the safety of these structures.The elasto-magnetic (EM) sensor is the most promising for stress monitoring of in-service steel structures.Nevertheless,the necessity of magnetic excitation to saturation due to the use of a secondary coil for signal detection,keeps from its engineering application.In this paper,a smart elasto-magneto-electric (EME) sensor using magneto-electric (ME) sensing units to take the place of the secondary coil has been exploited for the first time.The ME sensing unit is made of ME laminated composites,which has an ultrahigh ME voltage coefficient and can measure the magnetic induction simply and precisely.Theoretical analysis and characterization experiments firstly conducted on the ME laminated composites showed that the ME sensing units can be applied in the EM sensor for improved performance in stress monitoring.A tension test of a steel bar was carried out to characterize our smart EME sensor and the results showed high accuracy and sensitivity.The present smart EME sensor is a promising tool for stress monitoring of steel structures in railway and other civil infrastructures. 作者： Author： Yuan-feng DUAN[1]  Ru ZHANG[1]  Yang ZHAO[1]  Siu-wing OR[2]  Ke-qing FAN[3]  Zhi-feng TANG[1] 作者單位： College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaDepartment of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, ChinaSchool of Information Engineering, Wuyi University, Jiangmen 529020, China 期 刊： 浙江大學學報（英文版）（A輯：應用物理和工程）   ISTICEISCI Journal： Journal of Zhejiang University Science A 年，卷(期)： 2011, 12(12) 分類號： U216.42 Keywords： Stress monitoring    High-speed railway    Steel rail    Elasto-magnetic (EM) sensor    Magneto-electric (ME)    Elasto-magneto-electric (EME) sensor    機標分類號： =汽 TV3 機標關鍵詞： Smart    EME    steel structures    laminated composites    analysis and characterization    stress state    magnetic excitation    magnetic induction    signal detection    smart    performance in    high accuracy    steel bar    improved    coil    used in    tension    results    place    paper 基金項目： the National Natural Science Foundation of China，the Zhejiang Provincial Natural Science Foundation,China，the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China，the Key Science and Technology Innovation Team Program of Zhejiang Province,China

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