Output Characteristics Analysis And Experimental Study Of Fe-Ga Alloy Transducer

Fe-Ga alloy is another new magnetostrictive material after Tefenol-D.It has the characteristics of small hysteresis,excellent mechanical properties and low saturated magnetic field.It can be widely used in precision drive,intelligent sensing,non-destructive testing and other fields.In order to design magnetostrictive transducer with Fe-Ga alloy,it is necessary to define the magnetic characteristic parameters of alloy.When applying magnetostrictive transducer,it is necessary to analyze the output characteristics of transducer.Therefore,the magnetic properties of Fe-Ga alloy are measured,the multi-physical field coupling characteristics,magnetic field distribution and harmonic vibration of magnetostrictive transducer are analyzed,the experimental platform of magnetostrictive transducer is built,and the dynamic hysteresis curve and output characteristics of magnetostrictive transducer under stress are analyzed.The low-frequency magnetic properties of the rod-shaped Fe-Ga alloy are measured,and magnetostrictive properties of Fe-Ga alloy is analyzed.When magnetic field intensity reaches 15 k A/m,the strain of Fe-Ga alloy rod begins to reach saturation.When magnetic field intensity reaches 20 k A/m,the strain of Fe-Ga alloy rod reaches saturation completely,which is verified by experiments.The high-frequency magnetic properties of the ring-shaped Fe-Ga alloy are studied.The dynamic permeability and loss model of Fe-Ga alloy is established,and the elastic magnetic permeability,viscous magnetic permeability,initial permeability,loss factor and dynamic hysteresis curve of Fe-Ga alloy under different magnetic field frequencies are measured by AMH-1M-S dynamic magnetic property test system.And the electromagnetic loss and medium energy storage of Fe-Ga alloy are analyzed.The multi-physical field coupling characteristics of magnetostrictive transducer are analyzed.The magnetic field strength,magnetic induction intensity and strain distribution of the bow-type magnetostrictive transducer,the window-type magnetostrictive transducer and the double-coil magnetostrictive transducer are analyzed by COMSOL finite element method,and the resonance characteristics of different structure transducers are analyzed.It is found that the magnetic field and strain distribution of double-coil magnetostrictive transducer are uniform.The static output characteristics of double-coil magnetostrictive transducer under stress are analyzed.With the increase of applied stress,the output displacement of the transducer increases gradually.The experimental platform of Fe-Ga alloy double coil magnetostrictive transducer is built,and the hysteresis characteristics of transducer under stress are measured.When the same magnetic field frequency is applied,applying stress can reduce the hysteresis of transducer.The static output characteristics of transducer under stress are measured and analyzed.The dynamic output characteristics of transducer under stress are analyzed.The output displacement will increase first and then decrease with the increase of applied stress.When the applied stress is 2 MPa and the magnetic field frequency is 10 Hz,the output displacement amplitude of the transducer can reach 7.2*10^-6 m.Under the bias magnetic field of 2.1 k A/m,the applied magnetic field frequencies are 10,30,50,80 Hz.With the increase of the magnetic field frequencies,the slope of output displacement of transducer decreases gradually,and the shape of output displacement ring changes gradually from flat to elliptic.