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超磁致伸缩换能器的非线性特性 被引量:8
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作者 袁惠群 李鹤 +1 位作者 周硕 闻邦椿 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2002年第4期404-407,共4页
建立了超磁致伸缩换能器的等效动力学模型 ,应用Green函数得到了换能器的固有频率值 ,导出了超磁致伸缩换能器非线性振动响应的近似解析式·通过数值模拟 ,发现了超磁致伸缩换能器振动系统具有复杂的分叉和混沌行为·
关键词 超磁致伸缩能器 非线性 分叉 混沌 等效动力学模型
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Design and Magnetic Field Uniformity of Giant Magnetostrictive Ultrasonic Transducer for Progressive Sheet Forming
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作者 LI Pengyang LIU Qiang +2 位作者 ZHOU Xuan LI Wei WANG Limeng 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第3期393-402,共10页
Design of a giant magnetostrictive ultrasonic transducer for progressive sheet forming was presented.A dynamic analysis of the theoretically designed ultrasonic vibration system was carried out using the finite elemen... Design of a giant magnetostrictive ultrasonic transducer for progressive sheet forming was presented.A dynamic analysis of the theoretically designed ultrasonic vibration system was carried out using the finite element method(FEM).In addition,simulations were performed to verify the theoretical design.Then,a magnetically conductive material was added between the giant magnetostrictive rod and the permanent magnet.Besides,magnetic field simulations of the transducer were performed.The influence of the material thickness of the magnetically conductive material on uniformity of the induced magnetic field was studied.Furthermore,the impedance analysis and amplitude measurement were performed to compare the performance of transducers with and without the magnetically conductive material.The experimental results show that the magnetic field uniformity is the highest when the magnetically conductive material has a thickness of about 1.6 mm.The output amplitude of the giant magnetostrictive transducer is improved by adding the magnetically conductive material.Moreover,the mechanical quality factor and impedance are reduced,while the transducer operates more stably. 展开更多
关键词 giant magnetostrictive material(GMM) ultrasonic transducer magnetic field uniformity finite element analysis
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Multi-belts coil longitudinal guided wave magnetostrictive transducer for ferromagnetic pipes testing 被引量:5
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作者 HAO KuanSheng HUANG SongLing +1 位作者 ZHAO Wei WANG Shen 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第2期502-508,共7页
A new ultrasonic transducer with multi-belts coil for generating and receiving longitudinal guided wave in ferromagnetic material pipes is proposed.The theory backgrounds and transduction principle of the proposed tra... A new ultrasonic transducer with multi-belts coil for generating and receiving longitudinal guided wave in ferromagnetic material pipes is proposed.The theory backgrounds and transduction principle of the proposed transducer are presented and ana- lyzed.To verify the performance of the transducer,several experiments are performed.The performance of inspecting crack, frequency-tuned characteristic,effect of bias static magnetic field and dynamic magnetic field,lift-off effect and effect of the period number of the exciting current are investigated.The results show that the proposed coils not only could tune the center frequency but also could improve the amplitude and signal-to-noise(SNR)of the detected signals.Bias static magnetic field and dynamic magnetic field are two important factors influencing the amplitude of the longitudinal guided wave.The amplitude of the longitudinal guided wave is exponentially decreased versus the lift-off distance of the transmitter and receiver.Period number of excitation signal could influence the amplitude and wave width of the ultrasonic wave.The proposed transducer could easily control the wave modes and would be a better choice for pipes’monitoring and inspection compared to traditional single-belt coil transducer. 展开更多
关键词 longitudinal guided wave nondestructive testing magnetostrictive effect TRANSDUCER frequency tune LIFT-OFF
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