超磁致伸缩换能器预应力优化设计方法研究
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摘要
为优化超磁致伸缩换能器的工作性能、提高输出振幅,基于预应力对磁致伸缩效应的作用机理,建立了饱和磁致伸缩系数与预应力的关系模型。提出磁致伸缩灵敏度的概念,建立其与预应力和外磁场强度之间关系的理论模型。以超声换能器输出振幅最大为目标,提出以磁致伸缩平均灵敏度最大为准则的最佳预应力值确定方法。实验结果表明:随着预应力的增大,磁致伸缩平均灵敏度存在极大值,该预应力可在一定驱动磁场强度下获得最大的超声振幅,由此验证了磁致伸缩灵敏度模型的正确性和最佳预应力确定方法的可行性。提出的最佳预应力模型对超磁致伸缩换能器设计中预应力的选择具有指导意义,有助于大振幅超磁致伸缩换能器的设计及应用。
In order to improve the performance and amplitude of a giant magnetostrictive transducer,this paper establishes a mathematical model of saturation magnetostrictive coefficient and prestress based on the mechanism of the effect of prestress on a giant magnetostrictive.We put forth the concept of magnetostrictive sensitivity and proposed a theoretical model of magnetostrictive sensitivity,external magnetic field intensity and prestress.In order to maximize the amplitude of the ultrasonic transducer,we selected the optimal prestress with the criteria of the optimal average magnetostrictive sensitivity.The experimental results showed that average magnetostrictive sensitivity exists optimal value with increasing prestress,and maximum ultrasonic amplitude was obtained under a certain magnetic field,thereby verifying the validity of the model of magnetostrictive sensitivity and the feasibility of the optimal prestress method.The proposed model of optimal prestress has guiding significance for the choice of prestress,design,and application of a giant magnetostrictive transducer.
In order to improve the performance and amplitude of a giant magnetostrictive transducer,this paper establishes a mathematical model of saturation magnetostrictive coefficient and prestress based on the mechanism of the effect of prestress on a giant magnetostrictive.We put forth the concept of magnetostrictive sensitivity and proposed a theoretical model of magnetostrictive sensitivity,external magnetic field intensity and prestress.In order to maximize the amplitude of the ultrasonic transducer,we selected the optimal prestress with the criteria of the optimal average magnetostrictive sensitivity.The experimental results showed that average magnetostrictive sensitivity exists optimal value with increasing prestress,and maximum ultrasonic amplitude was obtained under a certain magnetic field,thereby verifying the validity of the model of magnetostrictive sensitivity and the feasibility of the optimal prestress method.The proposed model of optimal prestress has guiding significance for the choice of prestress,design,and application of a giant magnetostrictive transducer.
引文
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[12]李明范,项占琴,吕福在.超磁致伸缩换能器磁路设计及优化[J].浙江大学学报:工学版,2006(2):192-196.Li Mingfan,Xiang Zhanqin,LüFuzai.Magnet circuit design and optimization of giant magnetostrictive transducer[J].Journal of Zhejiang University:Engineering Science,2006(2):192-196.(in Chinese)
[2]Bertsche E,Ehmann K,Malukhin K.An analytical model of rotary ultrasonic milling[J].The International Journal of Advanced Manufacturing Technology,2013,65(9-12):1705-1720.
[3]曾庚鑫,曹彪,曾海泉.超磁致伸缩功率超声换能器的振动分析[J].振动、测试与诊断,2011,31(5):614-617.Zeng Gengxin,Cao Biao,Zeng Haiquan.Vibration analysis on magnetostrictive power ultrasonic transducer[J].Journal of Vibration,Measurement&Diagnosis,2011,31(5):614-617.(in Chinese)
[4]张承龙,冯平法,吴志军.旋转超声加工振幅与实际切削深度特性研究[J].兵工学报,2013,34(7):883-888.Zhang Chenglong,Feng Pingfa,Wu Zhijun.Research on the properties of ultrasonic vibration amplitude and actual cutting depth in rotary ultrasonic machining[J].Acta Armamentarii,2013,34(7):883-888.(in Chinese)
[5]袁惠群,李莹,李东,等.超磁致伸缩微致动器车削系统建模与控制[J].振动、测试与诊断,2014,34(2):351-355.Yuan Huiqun,Li Ying,Li Dong,et al.Modelling and control for giant magnetostrictive micro-actuator turning system[J].Journal of Vibration,Measurement&Diagnosis,2014,34(2):351-355.(in Chinese)
[6]Weisensel G N,Hansen T T,Hrbek W D.High-power ultrasonic Terfenol-D transducers enable commercial applications[C]∥5th Annual International Symposium on Smart Structures and Materials.[S.l.]:International Society for Optics and Photonics,1998:450-458.
[7]Calkins F T,Dapino M J,Flatau A B.Effect of prestress on the dynamic performace of a terfenol-d transducer[C]∥Smart Structures and Materials.[S.l.]:International Society for Optics and Photonics,1997:293-304.
[8]Bomba J,Kaleta J,Sawa P.An initial investigation into change in magnetomechanical properties of terfenold rod due to prestress and temperature[J].Anyagvizsgalok Lapja,2004(1):19-21.
[9]Dapino M J,Smith R C,Faidley L A E,et al.A coupled structural-magnetic strain and stress model for magnetostrictive transducers[J].Journal of Intelligent Material Systems and Structures,2000,11(2):135-152.
[10]近角聪信.铁磁性物理[M].葛世慧,译.兰州:兰州大学出版社,2002:408-415.
[11]郭沛飞,贾振元,杨兴,等.压磁效应及其在传感器中的应用[J].压电与声光,2001(1):26-29.Guo Peifei,Jia Zhenyuan,Yang Xing,et al.Magnetoelastic effect and its application in sensors[J].Piezoelectrics&Acoustooptics,2001(1):26-29.(in Chinese)
[12]李明范,项占琴,吕福在.超磁致伸缩换能器磁路设计及优化[J].浙江大学学报:工学版,2006(2):192-196.Li Mingfan,Xiang Zhanqin,LüFuzai.Magnet circuit design and optimization of giant magnetostrictive transducer[J].Journal of Zhejiang University:Engineering Science,2006(2):192-196.(in Chinese)