System and method for testing energy conversion efficiency of giant magnetostrictive flextensional transducer

Abstract

The invention discloses a giant magnetostrictive flextensional transducer energy conversion efficiency test system and method. The test system comprises a load part, a power supply part and a measuring and monitoring part. The load part comprises an oscillator module, an excitation module, a magnetic conduction module, an output module, a prestress loading module and a temperature control module; the power supply part comprises a programmable alternating current power supply and a matching box; the measuring and monitoring part comprises a power analyzer, a storage recorder, an oscilloscope, a laser displacement sensor, an acceleration sensor, a digital platform and the like. According to the method, the energy conversion efficiency of the giant magnetostrictive flextensional transducer under different working conditions can be simply, conveniently and effectively extracted, and theoretical support is provided for structural design and optimization of the giant magnetostrictive flextensional transducer.

Description

Technical Field

[0001] The invention relates to the technical field of giant magnetostrictive flextensional transducer energy conversion efficiency measurement, and in particular to a giant magnetostrictive flextensional transducer energy conversion efficiency testing system and method. Background Art

[0002] Giant magnetostrictive materials have unique advantages such as fast frequency response, high output, and high energy density, and have become a hot topic of research. They are widely used in underwater detection, non-destructive testing, and other occasions. As the core component of the giant magnetostrictive flextensional transducer, the working state of the giant magnetostrictive rod has a great influence on the material properties, which in turn has a huge impact on the energy conversion process of the giant magnetostrictive flextensional transducer. However, the energy conversion efficiency of the existing giant magnetostrictive flextensional transducer under different working conditions is still unclear, which seriously restricts its use and promotion.

[0003] At present, a lot of research has been carried out on the loss characteristics of giant magnetostrictive materials at home and abroad, and corresponding testing systems have been developed. However, the test objects are only small-sized annular or block materials, and the complex working conditions of the giant magnetostrictive flextensional transducer in actual operation, such as different temperatures, prestresses and bias magnetic fields, are not considered. The above research lacks a systematic testing method and is difficult to apply to actual working conditions, and cannot provide a greater reference for the development of giant magnetostrictive flextensional transducers. Summary of the invention

[0004] The purpose of the present invention is to propose a giant magnetostrictive flextensional transducer energy conversion efficiency testing system and method, which can effectively extract the energy conversion efficiency of the giant magnetostrictive flextensional transducer under different prestress and temperature conditions, and has guiding significance for the design of the giant magnetostrictive flextensional transducer.

[0005] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0006] A giant magnetostrictive flextensional transducer energy conversion efficiency testing system includes a load part, the load part is electrically connected to a measurement and monitoring part and a power supply part, and the load part is powered by the power supply part, and is characterized in that:

[0007] The load part includes an oscillator module, an excitation module, a magnetic conductivity module, an output module, a prestressed loading module and a temperature control module; the oscillator module includes a giant magnetostrictive rod, an upper samarium cobalt permanent magnet and a lower samarium cobalt permanent magnet; the excitation module includes a left excitation coil and a right excitation coil; the magnetic conductivity module includes an upper magnetic conductivity block, a lower magnetic conductivity block and a magnetic yoke, the upper magnetic conductivity block and the lower magnetic conductivity block are symmetrically distributed at both ends of the oscillator module, and together with the magnetic yoke form a magnetic circuit of the transducer; the output module is a flextensional shell, which is arranged on the flextensional shell. The two ends of the magnetic module; the prestressed loading module includes a digital pressure sensor and a press, the press is located in the long axis direction of the flextensional shell, and the digital pressure sensor is located between the upper magnetic block and the long axis of the flextensional shell; the temperature control module includes a constant temperature box, the constant temperature box completely covers the vibrator module, and the constant temperature box also covers the lower part of the upper magnetic block and the upper part of the lower magnetic block; the upper samarium cobalt permanent magnet and the lower samarium cobalt permanent magnet are symmetrically distributed at both ends of the giant magnetostrictive rod, and the left excitation coil and the right excitation coil are symmetrically distributed on both sides of the giant magnetostrictive rod;

[0008] The measurement and monitoring part includes a digital platform, which is electrically connected to a power analyzer, a dynamic signal acquisition system, a laser displacement sensor, a storage recorder and an oscilloscope. The dynamic signal acquisition system is electrically connected to an acceleration sensor, which is placed at the short axis of the flextensional shell. The laser displacement sensor is located outside the short axis of the flextensional shell. The storage recorder is electrically connected to a Hall chip, an induction coil and a thermocouple. The Hall chip is tightly attached to the surface of the giant magnetostrictive rod, the induction coil is wound around the surface of the giant magnetostrictive rod, the thermocouple is attached to the giant magnetostrictive rod, and the oscilloscope and the power analyzer are electrically connected to both ends of the left excitation coil and the right excitation coil.

[0009] Furthermore, the power supply part includes a programmable AC power supply and a matching box, and the programmable AC power supply is electrically connected to the load part through the matching box.

[0010] Furthermore, the temperature control device also includes a heating plate and a temperature control device, the heating plate is arranged on the inner wall of the constant temperature box, and the temperature control device is electrically connected to the heating plate.

[0011] Furthermore, the matching box in the power supply part is composed of a plurality of capacitors, and the reactance under different working conditions of the test system is matched by adjusting the series and parallel connection of the capacitors.

[0012] Furthermore, the thermostatic box has an inner frame made of epoxy resin board and an outer frame made of thermal insulation cotton.

[0013] A method for testing the energy conversion efficiency of a giant magnetostrictive flextensional transducer comprises the following steps:

[0014] Step 1: Use the programmable AC power supply described in claim 2 to provide alternating currents of different amplitudes to the giant magnetostrictive flextensional transducer, use the Hall chip described in claim 1 to test the magnetic field strength in the giant magnetostrictive rod, use the induction coil described in claim 1 to test the magnetic flux density in the giant magnetostrictive rod, and according to the formula: W e1 (T,σ,B bias )=∫HdB(T,σ,B bias ) Solve the magnetic energy loss W of the giant magnetostrictive rod under the corresponding working conditions e1 (T,σ,B bias ), where T is the temperature under this condition, σ is the prestress, B bias The oscilloscope described in claim 4 is used to monitor the voltage, current and phase at both ends of the excitation coil to obtain the eddy current loss W of the excitation coil. e2 Magnetic energy loss W of giant magnetostrictive rod e1 (T,σ,B bias ) and the eddy current loss W of the excitation coil e2 The sum is the electromagnetic loss W of the giant magnetostrictive flextensional transducer e (T,σ,B bias );

[0015] Step 2: Use the acceleration sensor described in claim 1 to test the mechanical properties of the giant magnetostrictive flextensional transducer housing under the working condition, use the laser displacement sensor described in claim 1 to test the displacement of the short axis of the giant magnetostrictive flextensional transducer housing under the working condition, and use the formula: m (T,σ,B bias )=ω r ·E s Q = W r Q E ε(T,σ,B bias ) 2 ·V;ω r is the angular frequency, E s is the elastic potential energy per unit volume, Q is the quality factor, E is the Young's modulus, ε(T,σ,B bias ) is the displacement of the short axis of the flextensional shell under the influence of temperature, prestress and bias magnetic field, V is the volume, and the mechanical loss W of the giant magnetostrictive flextensional transducer is m (T,σ,B bias ) to perform calculations;

[0016] Step 3: Use the power analyzer described in claim 1 to measure the input power W of the giant magnetostrictive flextensional transducer under the working condition. p Monitor and subtract the electromagnetic loss W described in step 1 and step 2 e (T,σ,Bbias ) and mechanical loss W m (T,σ,B bias ), we can get the output mechanical energy W o (T,σ,B bias ), and then the electromagnetic conversion efficiency η of the giant magnetostrictive flextensional transducer can be calculated e (T,σ,B bias ), magnetic machine conversion efficiency η m (T,σ,B bias ) and energy conversion efficiency η(T,σ,B bias );

[0017] Step 4: Using the temperature control module described in claim 1 to change the temperature of the giant magnetostrictive rod, using the press described in claim 1 to change the prestress of the giant magnetostrictive flextensional transducer, again providing the giant magnetostrictive flextensional transducer with an alternating current of the same amplitude and frequency as in step 1-2, and testing the magnetic field intensity, magnetic flux density, mechanical properties and short axis displacement of the giant magnetostrictive rod as described in step 1-3, and obtaining the energy conversion efficiency of the giant magnetostrictive flextensional transducer under different temperature and prestress conditions.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The present invention provides a giant magnetostrictive flextensional transducer energy conversion efficiency testing system, which can generate excitations under different working conditions through the power supply part, provide an alternating magnetic field for the load part, and use the prestress loading module and temperature control module of the load part to adjust the prestress and temperature of the giant magnetostrictive rod. The input electric power, electromagnetic loss and mechanical loss of the giant magnetostrictive flextensional transducer under different working conditions can be measured by the measurement and monitoring part. The energy conversion efficiency of the giant magnetostrictive flextensional transducer in actual operation can be directly extracted by using a digital platform.

[0020] The present invention provides a method for testing the energy conversion efficiency of a giant magnetostrictive flextensional transducer. Compared with the existing method of measuring the loss characteristics of a small-sized giant magnetostrictive material under the influence of a single factor, the present invention tests a giant magnetostrictive flextensional transducer comprising a large-volume, columnar giant magnetostrictive rod, and simultaneously considers the influence of prestress, temperature and bias magnetic field, directly extracts the energy conversion efficiency of the giant magnetostrictive flextensional transducer in actual operation, and has guiding significance for the design of a high-power giant magnetostrictive flextensional transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the schematic diagram of the giant magnetostrictive flextensional transducer energy conversion efficiency test system;

[0022] Figure 21 is a schematic structural diagram of a load portion of a giant magnetostrictive flextensional transducer energy conversion efficiency test system according to an embodiment of the present invention;

[0023] Figure 3 It is the logic block diagram of the giant magnetostrictive flextensional transducer energy conversion efficiency test system;

[0024] Figure 4 It is a schematic diagram of the key measurement and monitoring part of the giant magnetostrictive flextensional transducer;

[0025] Figure 5 It is a logic block diagram of the energy conversion efficiency test method of giant magnetostrictive flextensional transducer;

[0026] Figure 6 It is the digital platform interface. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following is a detailed description of a giant magnetostrictive flextensional transducer energy conversion efficiency testing system and method proposed by the present invention in combination with the accompanying drawings and preferred examples as follows:

[0028] like Figure 1 As shown, the present invention discloses a giant magnetostrictive flextensional transducer energy conversion efficiency testing system, including: a load part, a power supply part and a measurement and monitoring part.

[0029] like Figure 1 and 2 As shown, the load part of a giant magnetostrictive flextensional transducer magnetic energy loss test platform provided by the present invention includes an upper samarium cobalt permanent magnet 1, a giant magnetostrictive rod 2, a lower samarium cobalt permanent magnet 3, a left excitation coil 4, a right excitation coil 5, an upper magnetic conductive block 6, a lower magnetic conductive block 7, a magnetic yoke 8, a flextensional housing 9, a digital pressure sensor 10, a press, a constant temperature box, a heating plate and a temperature control device.

[0030] like Figure 1 and 2 As shown, the load part is respectively composed of an oscillator module, an excitation module, a magnetic conductivity module, an output module, a prestressed loading module, and a temperature control module. The oscillator module includes an upper samarium cobalt permanent magnet 1, a giant magnetostrictive rod 2, and a lower samarium cobalt permanent magnet 3; the excitation module includes a left excitation coil 4 and a right excitation coil 5; the magnetic conductivity module includes an upper magnetic conductivity block 6, a lower magnetic conductivity block 7, and a magnetic yoke 8; the output module includes a flextensional housing 9; the prestressed loading module includes a digital pressure sensor 10 and a press; the temperature control module includes a constant temperature box, a heating plate, and a temperature control device.

[0031] In this embodiment, the upper samarium cobalt permanent magnet 1 and the lower samarium cobalt permanent magnet 3 in the vibrator module are symmetrically distributed at both ends of the giant magnetostrictive rod, providing a relatively uniform bias magnetic field for the giant magnetostrictive rod.

[0032] In this embodiment, the left excitation coil 4 and the right excitation coil 5 in the excitation module are symmetrically distributed on both sides of the giant magnetostrictive rod, providing a relatively uniform alternating magnetic field for the giant magnetostrictive rod.

[0033] In this embodiment, the upper magnetic conductive block 6 and the lower magnetic conductive block 7 in the magnetic conductive module are symmetrically distributed at two ends of the vibrator module, and together with the magnetic yoke form a magnetic circuit of the giant magnetostrictive flextensional transducer.

[0034] In this embodiment, the output module is a flextensional housing 9, which is added to both ends of the magnetic conductive module.

[0035] In this embodiment, the press in the prestress loading module is located in the long axis direction of the flextensional shell, and the press can be used to adjust the prestress of the giant magnetostrictive flextensional transducer. The digital pressure sensor 10 in the prestress loading module can display the prestress of the giant magnetostrictive flextensional transducer in real time.

[0036] In this embodiment, the thermostat in the temperature control module has an inner frame made of epoxy resin board and an outer frame made of thermal insulation cotton. The thermostat covers the upper samarium cobalt permanent magnet, the lower samarium cobalt permanent magnet, the entire giant magnetostrictive rod, and part of the upper magnetic block and the lower magnetic block.

[0037] In this embodiment, the heating plates and temperature control device in the temperature control module are evenly distributed on the inner wall of the constant temperature box. The temperature inside the constant temperature box can be adjusted by controlling the on and off of the heating plates, and the temperature inside the constant temperature box can be displayed and fed back in real time through the display screen.

[0038] The power supply part includes a programmable AC power supply and a matching box. The programmable AC power supply can change the excitation magnitude of the input excitation coil through programming.

[0039] In this embodiment, a matching box is added to the power supply part, which can adjust the circuit impedance to a large extent and increase the input amplitude of the excitation coil within the power limit of the programmable AC power supply, thereby providing a large range of adjustable alternating magnetic field for the giant magnetostrictive rod.

[0040] In this embodiment, the matching box in the power supply part is composed of a plurality of capacitors, and the reactance of the test system under different working conditions is matched by adjusting the series and parallel connection of the capacitors.

[0041] like Figure 3As shown, the measuring and monitoring part includes a power analyzer, a storage recorder, an oscilloscope, a laser displacement sensor, an acceleration sensor, and a digital platform. The power analyzer can monitor the power output at both ends of the load in real time, the storage recorder can monitor the temperature rise inside the load in real time, the oscilloscope can monitor the voltage, current, and phase at both ends of the excitation coil in real time, the laser displacement sensor can test the displacement of the load, the acceleration sensor can test the mechanical properties of the flextensional shell, and the digital platform can process the test data in real time and extract the energy conversion efficiency of the giant magnetostrictive flextensional transducer under the corresponding working conditions.

[0042] The schematic diagram of the key measurement and monitoring part of the giant magnetostrictive flextensional transducer provided by the present invention is as follows: Figure 4 As shown, the measuring and monitoring part also includes a thermocouple pasted on the giant magnetostrictive rod, and the output is connected to a storage recorder to ensure that the temperature of the giant magnetostrictive rod remains basically unchanged in each test.

[0043] like Figure 4 As shown, the measuring and monitoring part also includes an induction coil tightly wound on the surface of the giant magnetostrictive rod, and the two output ends are connected to the storage recorder.

[0044] like Figure 4 As shown, the measuring and monitoring part also includes a Hall chip which is closely attached to the surface of the giant magnetostrictive rod, and the two output ends are connected to the storage recorder.

[0045] like Figure 1 As shown, the acceleration sensor in the measurement and monitoring part is placed at the short axis of the flextensional shell to obtain the damping ratio of the flextensional shell under different working conditions.

[0046] like Figure 1 As shown, the laser displacement sensor in the measuring and monitoring part is placed outside the short axis of the flextensional shell to test the displacement of the short axis of the flextensional shell under different working conditions.

[0047] like Figure 6 As shown, the digital platform in the measurement and monitoring part can process the test data in real time and extract the energy conversion efficiency of the giant magnetostrictive flextensional transducer under the corresponding working conditions.

[0048] like Figure 5 As shown, the present invention also discloses a method for testing the output characteristics of a giant magnetostrictive flextensional transducer, which is implemented on the basis of the above-mentioned giant magnetostrictive flextensional transducer output characteristics testing system, and the method comprises the following steps:

[0049] Step 1: Use a programmable AC power supply to provide alternating currents of different amplitudes to the giant magnetostrictive flextensional transducer, use a Hall chip to test the magnetic field strength in the giant magnetostrictive rod, use an induction coil to test the magnetic flux density in the giant magnetostrictive rod, and solve the magnetic energy loss We1(T,σ,Bbias) of the giant magnetostrictive rod under the corresponding working condition according to the formula: We1(T,σ,Bbias)=∫HdB(T,σ,Bbias), where T is the temperature under the working condition, σ is the prestress, and Bbias is the bias magnetic field. Use an oscilloscope to monitor the voltage, current, and phase at both ends of the excitation coil to obtain the eddy current loss We2 of the excitation coil. The sum of the magnetic energy loss We1(T,σ,Bbias) of the giant magnetostrictive rod and the eddy current loss We2 of the excitation coil is the electromagnetic loss We(T,σ,Bbias) of the giant magnetostrictive flextensional transducer;

[0050] Step 2: Use an acceleration sensor to test the mechanical properties of the giant magnetostrictive flextensional transducer shell under the working condition, use a laser displacement sensor to test the displacement of the short axis of the giant magnetostrictive flextensional transducer shell under the working condition, and calculate the mechanical loss Wm(T,σ,Bbias) of the giant magnetostrictive flextensional transducer according to the formula: Wm(T,σ,Bbias)=ωr·Es·Q=Wr·Q·E·ε(T,σ,Bbias)2·V; ωr is the angular frequency, Es is the elastic potential energy per unit volume, Q is the quality factor, E is the Young's modulus, ε(T,σ,Bbias) is the displacement of the short axis of the flextensional shell under the influence of temperature, prestress, and bias magnetic field, and V is the volume;

[0051] Step 3: Use a power analyzer to monitor the input electric power Wp of the giant magnetostrictive flextensional transducer under this working condition, and subtract the electromagnetic loss We(T,σ,Bbias) and mechanical loss Wm(T,σ,Bbias) described in steps 1 and 2 to obtain the output mechanical energy Wo(T,σ,Bbias), and then calculate the electromagnetic conversion efficiency ηe(T,σ,Bbias), magnetomechanical conversion efficiency ηm(T,σ,Bbias) and energy conversion efficiency η(T,σ,Bbias) of the giant magnetostrictive flextensional transducer;

[0052] Step 4: using a temperature control module to change the temperature of the giant magnetostrictive rod, using a press to change the prestress of the giant magnetostrictive flextensional transducer, again providing the giant magnetostrictive flextensional transducer with an alternating current of the same amplitude and frequency as in step 1-2, and testing the magnetic field intensity, magnetic flux density, mechanical properties and short axis displacement of the giant magnetostrictive rod, as described in step 1-3, to obtain the energy conversion efficiency of the giant magnetostrictive flextensional transducer under different temperature and prestress conditions;

[0053] Compared with the existing method of measuring the loss characteristics of small-sized giant magnetostrictive materials under the influence of a single factor, the test object of the present invention is a giant magnetostrictive flextensional transducer comprising a large-volume, columnar giant magnetostrictive rod, and the influence of prestress, temperature and bias magnetic field are considered at the same time. The energy conversion efficiency of the giant magnetostrictive flextensional transducer in actual operation can be directly extracted, which has guiding significance for the design of high-power giant magnetostrictive flextensional transducers.

[0054] The giant magnetostrictive flextensional transducer energy conversion efficiency testing system and method described in the present invention have the characteristics of simple structure, easy operation, stability and accuracy, and have practical application value.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, makes any simple modifications, equivalent changes and modifications to the above embodiments based on the technical essence of the present invention, which still fall within the scope of the technical solution of the present invention.

Claims

1. A giant magnetostrictive flextensional transducer energy conversion efficiency testing system, comprising a load part, the load part is electrically connected to a measuring and monitoring part and a power supply part, the load part is powered by the power supply part, and is characterized in that: The load part includes an oscillator module, an excitation module, a magnetic conductivity module, an output module, a prestressed loading module and a temperature control module; the oscillator module includes a giant magnetostrictive rod, an upper samarium cobalt permanent magnet and a lower samarium cobalt permanent magnet; the excitation module includes a left excitation coil and a right excitation coil; the magnetic conductivity module includes an upper magnetic conductivity block, a lower magnetic conductivity block and a magnetic yoke, the upper magnetic conductivity block and the lower magnetic conductivity block are symmetrically distributed at both ends of the oscillator module, and together with the magnetic yoke form a magnetic circuit of the transducer; the output module is a flextensional shell, which is arranged on the flextensional shell. The two ends of the magnetic module; the prestressed loading module includes a digital pressure sensor and a press, the press is located in the long axis direction of the flextensional shell, and the digital pressure sensor is located between the upper magnetic block and the long axis of the flextensional shell; the temperature control module includes a constant temperature box, the constant temperature box completely covers the vibrator module, and the constant temperature box also covers the lower part of the upper magnetic block and the upper part of the lower magnetic block; the upper samarium cobalt permanent magnet and the lower samarium cobalt permanent magnet are symmetrically distributed at both ends of the giant magnetostrictive rod, and the left excitation coil and the right excitation coil are symmetrically distributed on both sides of the giant magnetostrictive rod; The measurement and monitoring part includes a digital platform, which is electrically connected to a power analyzer, a dynamic signal acquisition system, a laser displacement sensor, a storage recorder and an oscilloscope. The dynamic signal acquisition system is electrically connected to an acceleration sensor, which is placed at the short axis of the flextensional shell. The laser displacement sensor is located outside the short axis of the flextensional shell. The storage recorder is electrically connected to a Hall chip, an induction coil and a thermocouple. The Hall chip is tightly attached to the surface of the giant magnetostrictive rod, the induction coil is wound around the surface of the giant magnetostrictive rod, the thermocouple is attached to the giant magnetostrictive rod, and the oscilloscope and the power analyzer are electrically connected to both ends of the left excitation coil and the right excitation coil.

2. A giant magnetostrictive flextensional transducer energy conversion efficiency testing system as claimed in claim 1, characterized in that: The power supply part includes a programmable AC power supply and a matching box, and the programmable AC power supply is electrically connected to the load part through the matching box.

3. The giant magnetostrictive flextensional transducer energy conversion efficiency testing system according to claim 1, characterized in that: The temperature control device also includes a heating plate and a temperature control device. The heating plate is arranged on the inner wall of the constant temperature box, and the temperature control device is electrically connected to the heating plate.

4. The giant magnetostrictive flextensional transducer energy conversion efficiency testing system according to claim 1, characterized in that: The matching box in the power supply part is composed of a plurality of capacitors, and the reactance under different working conditions of the test system is matched by adjusting the series and parallel connection of the capacitors.

5. The giant magnetostrictive flextensional transducer energy conversion efficiency testing system according to claim 1, characterized in that: The thermostatic box has an inner frame made of epoxy resin board and an outer frame made of thermal insulation cotton.

6. A method for testing the energy conversion efficiency of a giant magnetostrictive flextensional transducer, comprising the following steps: Step 1: Use the programmable AC power supply described in claim 2 to provide alternating currents of different amplitudes to the giant magnetostrictive flextensional transducer, use the Hall chip described in claim 1 to test the magnetic field strength in the giant magnetostrictive rod, use the induction coil described in claim 1 to test the magnetic flux density in the giant magnetostrictive rod, and according to the formula: W e1 (T,σ,B bias )=∫HdB(T,σ,B bias ) Solve the magnetic energy loss W of the giant magnetostrictive rod under the corresponding working conditions e1 (T,σ,B bias ), where T is the temperature under this condition, σ is the prestress, B bias is the bias magnetic field. The voltage, current and phase at both ends of the excitation coil are monitored by the oscilloscope described in claim 4 to obtain the eddy current loss W of the excitation coil. e2 Magnetic energy loss W of giant magnetostrictive rod e1 (T,σ,B bias ) and the eddy current loss W of the excitation coil e2 The sum is the electromagnetic loss W of the giant magnetostrictive flextensional transducer e (T,σ,B bias ); Step 2: Use the acceleration sensor described in claim 1 to test the mechanical properties of the giant magnetostrictive flextensional transducer housing under the working condition, use the laser displacement sensor described in claim 1 to test the displacement of the short axis of the giant magnetostrictive flextensional transducer housing under the working condition, and use the formula: m (T,σ,B bias )=ω r ·E s Q = W r Q E ε(T,σ,B bias ) 2 ·V;ω r is the angular frequency, E s is the elastic potential energy per unit volume, Q is the quality factor, E is the Young's modulus, ε(T,σ,B bias ) is the displacement of the short axis of the flextensional shell under the influence of temperature, prestress and bias magnetic field, V is the volume, and the mechanical loss W of the giant magnetostrictive flextensional transducer is m (T,σ,B bias ) to perform calculations; Step 3: Use the power analyzer described in claim 1 to measure the input power W of the giant magnetostrictive flextensional transducer under the working condition. p Monitor and subtract the electromagnetic loss W described in step 1 and step 2 e (T,σ,B bias ) and mechanical loss W m (T,σ,B bias ), we can get the output mechanical energy W o (T,σ,B bias ), and then the electromagnetic conversion efficiency η of the giant magnetostrictive flextensional transducer can be calculated e (T,σ,B bias ), magnetic machine conversion efficiency η m (T,σ,B bias ) and energy conversion efficiency η(T,σ,B bias ); Step 4: Using the temperature control module described in claim 1 to change the temperature of the giant magnetostrictive rod, using the press described in claim 1 to change the prestress of the giant magnetostrictive flextensional transducer, again providing the giant magnetostrictive flextensional transducer with an alternating current of the same amplitude and frequency as in step 1-2, and testing the magnetic field intensity, magnetic flux density, mechanical properties and short axis displacement of the giant magnetostrictive rod as described in step 1-3, and obtaining the energy conversion efficiency of the giant magnetostrictive flextensional transducer under different temperature and prestress conditions.

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