Temperature and pressure influence testing method for magnetostrictive material

Abstract

The invention relates to the field of rare earth material research and test, and provides a magnetostriction material temperature and pressure influence test method, which comprises the following steps: S1, adjusting the temperature of a heat insulation box body, and feeding back the detected surface temperature value of a magnetostriction material to be tested to a control system; s2, adjusting a pressure value applied to the execution device; s3, the command execution device generates actions according to a preset program, and feeds all input variables and output variables back to the control system; s4, if all the to-be-detected preset temperature values are not completed, the S1 is executed, and if all the to-be-detected preset temperature values are completed, the S5 is executed; s5, if all the to-be-detected preset pressure values are not completed, executing S2, and if all the to-be-detected preset pressure values are completed, executing S6; and S6, recording all data, and completing the test. According to the invention, a reliable method is provided for research and calibration of the rare earth giant magnetostrictive material by calibrating the relationship among the output strain, the magnetic flux, the input magnetic field and the pressure of the magnetostrictive material.

Description

Technical Field

[0001] The invention relates to the field of rare earth material research and testing, and in particular to a method for testing the influence of temperature and pressure on magnetostrictive materials. Background Art

[0002] Rare earth giant magnetostrictive materials and their devices are of great concern to the country. In recent years, the national key research and development plan has launched the implementation of the key project of "rare earth new materials". Facing the urgent demand for rare earth new materials in the fields of new generation information technology, aerospace, advanced rail transportation, energy-saving and new energy vehicles, high-end medical equipment, advanced manufacturing, etc., we will develop rare earth new materials with my country's resource characteristics and urgent technical needs, strengthen the frontier technology foundation, engineering and application technology innovation of rare earth new materials, and enhance the original innovation ability and high-end application level of rare earth new materials.

[0003] However, the material properties of rare earth giant magnetostrictive materials are complex, and their physical properties are affected by coupled environmental factors such as external magnetic field, loading stress and working environment temperature. As for the influence of loading stress, most of the current applications use pre-loading, which limits the application performance of magnetostrictive materials. Once the load condition of magnetostrictive materials changes, it will affect the performance of the actuator. As for the influence of temperature, physical heating or cooling is more often used to compensate for the error caused by temperature. For example, patent document CN116518838A uses heating wire to heat magnetostrictive materials to compensate for the error caused by low temperature. However, since rare earth giant magnetostrictive materials are affected by the mutual coupling of various parameters, it is very difficult to determine the relationship between the output strain, magnetic flux and input magnetic field and pressure of magnetostrictive materials. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a method for testing the influence of temperature and pressure on magnetostrictive materials.

[0005] A method for testing the influence of temperature and pressure on a magnetostrictive material provided by the present invention comprises the following steps:

[0006] S1: The control system adjusts the temperature of the heat-insulating box to a preset temperature value T1, and feeds back the detected surface temperature value T2 of the magnetostrictive material to be measured in the actuator to the control system through the temperature detection component;

[0007] S2: The control system adjusts the pressure value applied by the pressure loading device to the actuator to a preset pressure value;

[0008] S3: The control system instructs the execution device to perform actions according to a predetermined program, and feeds back all input variables and output variables in the process to the control system;

[0009] S4: If all the preset temperature values ​​to be detected have not been completed, S1 is executed, and the control system is adjusted to the next preset temperature value. If all the preset temperature values ​​to be detected have not been completed, S5 is executed;

[0010] S5: If all the preset pressure values ​​to be detected have not been completed, S2 is executed, and the control system is adjusted to the next preset pressure value. If all the preset pressure values ​​to be detected have been completed, S6 is executed;

[0011] S6: The control system records all data, updates the parameters in the material model, and completes the test of the magnetostrictive material to be tested.

[0012] Preferably, the actuator is arranged inside the heat-insulating box, and the actuator is provided with a magnetostrictive material to be measured, a temperature detection component, and an energy input component arranged along the circumference of the magnetostrictive material to be measured.

[0013] Preferably, the pressure loading device is connected to the execution device and directly applies pressure on the magnetostrictive material sample to be tested.

[0014] Preferably, in S1, the preset temperature value T1 of the heat-insulating box and the surface temperature value T2 of the magnetostrictive material have the following relationship:

[0015] T2=a0+a1*T1

[0016] Among them: a1 is the environmental impact coefficient, a0 is the correction coefficient, and the values ​​of a0 and a1 are calculated and saved by the control system.

[0017] Preferably, the input variable is achieved by the control system commanding the energy input component to apply it to the actuator.

[0018] Preferably, the input variable includes any one or any combination of current, voltage and magnetic field and is calculated by the control system as an input magnetic field and substituted into the material model.

[0019] Preferably, the output variable includes any one or any combination of magnetic flux, displacement, strain, and force, which are fed back to the control system by the output detection device and calculated as output magnetic flux and strain to be substituted into the material model.

[0020] Preferably, the material model in the control system is as follows:

[0021]

[0022] Among them, ε is the output strain, B is the output magnetic flux, P is the input pressure, H is the input magnetic field, and the control system can be solved through the set value and the detection value;

[0023] s is the flexibility coefficient, d is the piezomagnetic coefficient, μ is the magnetic permeability coefficient, α is the thermal expansion coefficient, β is the thermomagnetic coefficient, and is the material parameter under the current input temperature value T1 and the preset pressure value P.

[0024] Preferably, the output detection device comprises one or more displacement, stress or strain sensors, and the output detection device is installed outside the heat-insulating box or inside the actuator.

[0025] Preferably, the heat-insulating box can be directly used in conjunction with an output detection device to measure the material properties of the magnetostrictive material to be tested at different temperatures.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention aims at the characteristic that the material properties of rare earth giant magnetostrictive materials are affected by the coupling of magnetic field, stress and temperature, and can measure the output characteristics of the material under the action of coupling variables, thereby avoiding the problem of ignoring a certain variable in the existing material testing, improving the performance of the material, and providing a reliable method for the research and calibration of rare earth giant magnetostrictive materials by calibrating the relationship between the output strain, magnetic flux and the input magnetic field and pressure of the magnetostrictive material.

[0028] 2. The present invention takes into account the possible influence of heat transfer process, and takes into account the inconsistency between ambient temperature and surface temperature of magnetostrictive material during the test process, so as to further improve the accuracy of material parameter testing; BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 Schematic diagram of the process steps of the present invention;

[0031] Figure 2 It is the signal connection diagram of the control system;

[0032] Figure 3 It is the device structure connection diagram;

[0033] Figure 4 This is a cross-sectional view of the interior of the insulation box.

[0034] The figure shows:

[0035] Insulation box 1

[0036] Execution device 2

[0037] Magnetostrictive material sample 21

[0038] Energy input assembly 22

[0039] Temperature detection component 23

[0040] Pressure loading device 3

[0041] Output detection device 4 DETAILED DESCRIPTION

[0042] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] Embodiment 1:

[0044] The present invention provides a method for testing the influence of temperature and pressure on magnetostrictive materials, comprising the following steps:

[0045] S1: The control system adjusts the preset temperature value of the heat-insulating box 1, which is recorded as T1, and feeds back the surface temperature value T2 of the magnetostrictive material 21 to be measured in the actuator 2 to the control system through the temperature detection component 23. The signal connection of the control system is as follows: Figure 2 As shown, the actuator 2 is arranged inside the heat-insulating box 1, as shown in FIG. Figure 3 , Figure 4 As shown, the actuator 2 is provided with a magnetostrictive material 21 to be measured, a temperature detection component 23, and an energy input component 22 arranged circumferentially along the magnetostrictive material 21 to be measured. The heat-insulating box 1 is made of heat-insulating material and has a heat-insulating effect, such as a square box structure made of a heat-insulating board; another example is a prismatic structure made of a heat-insulating board. The preset temperature value T1 of the heat-insulating box 1 and the surface temperature value T2 of the magnetostrictive material have the following relationship:

[0046] T2=a0+a1*T1

[0047] Where: a1 is the environmental impact coefficient, a0 is the correction coefficient, and the values ​​of a0 and a1 are calculated and saved by the control system;

[0048] S2: The control system adjusts the pressure value applied by the pressure loading device 3 to the actuator 2 to a preset pressure value, such as Figure 3 As shown, the pressure loading device 3 is connected to the actuator 2 and directly applies pressure to the magnetostrictive material 21 to be tested. The pressure loading device 3 can be implemented by an electromagnetic drive device, a nut and bolt matching structure, or other structures in the prior art, which will not be described here;

[0049] S3: The control system commands the execution device 2 to generate an action according to a predetermined program, and feeds back all input variables and output variables in the process to the control system; the input variable is implemented by the control system commanding the energy input component 22 to be applied to the execution device 2, and the input variable includes any one or any combination of current, voltage, and magnetic field, and is calculated by the control system as an input magnetic field and substituted into the material model. Specifically, the energy input component 22 can adopt an electromagnetic coil driver, which is arranged along the circumference of the magnetostrictive material 21 to be tested, and the electromagnetic coil driver is connected to a controllable current source arranged outside the execution device 2, and the electromagnetic coil driver can provide a stable electromagnetic field for the magnetostrictive material 21 to be tested by controlling the controllable current source. The test sample of the magnetostrictive material 21 to be tested is preferably in the shape of a rod, and can also be designed to have a circular, rectangular or other polygonal structure in cross section; the electromagnetic coil driver preferably adopts a multi-turn spiral coil or other device that provides an electromagnetic field under the action of current or voltage. The heat-insulating box and pressure loading device involved in the method of the present invention can be used optionally, which ensures that the test device can adapt to different needs, and each component can be put into use through a simple installation connection, with flexible structure and strong applicability.

[0050] The output variables include any one or any combination of magnetic flux, displacement, strain, and force, which are fed back to the control system by the output detection device 4 and calculated as output magnetic flux and strain and substituted into the material model. The material model in the control system is as follows:

[0051]

[0052] Among them, ε is the output strain, B is the output magnetic flux, P is the input pressure, H is the input magnetic field, and the control system can be solved through the set value and the detection value;

[0053] s is the flexibility coefficient, d is the piezomagnetic coefficient, μ is the magnetic permeability coefficient, α is the thermal expansion coefficient, β is the thermomagnetic coefficient, and is the material parameter under the current input temperature value T1 and the preset pressure value P. The output detection device 4 includes one or more displacement, stress or strain sensors, and the output detection device 4 is installed outside the heat-insulating box 1 or inside the actuator 2.

[0054] S4: If all the preset temperature values ​​to be detected have not been completed, S1 is executed, and the control system is adjusted to the next preset temperature value. If all the preset temperature values ​​to be detected have not been completed, S5 is executed;

[0055] S5: If all the preset pressure values ​​to be detected have not been completed, execute S2, update the preset pressure value, and adjust the control system to the next preset pressure value. If all the preset pressure values ​​to be detected have not been completed, execute S6;

[0056] S6: The control system records all data, updates the parameters in the material model, and completes the test of the magnetostrictive material 21. The present invention provides a reliable method for the research and calibration of rare earth giant magnetostrictive materials by calibrating the relationship between the output strain, magnetic flux and the input magnetic field and pressure of the magnetostrictive material.

[0057] Embodiment 2:

[0058] This embodiment is a preferred example of Embodiment 1. In this embodiment, the heat-insulating box 1 can be directly used in conjunction with the output detection device 4 to measure the material properties of the magnetostrictive material 21 to be measured at different temperatures.

[0059] Embodiment 3:

[0060] This embodiment is a preferred example of embodiment 1. In this embodiment, the heat-insulating box 1 maintains a fixed temperature, and the pressure loading device 3 can be directly used in conjunction with the actuator 2 to measure the material properties of the magnetostrictive material 21 to be tested under different pressure conditions.

[0061] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for testing the influence of temperature and pressure on magnetostrictive materials, characterized in that: The steps include: S1: The control system adjusts the temperature of the heat-insulating box (1) to a preset temperature value T1, and feeds back the detected surface temperature value T2 of the magnetostrictive material (21) to be measured in the actuator (2) to the control system through the temperature detection component (23); S2: the control system adjusts the pressure value applied by the pressure loading device (3) to the actuator (2) to a preset pressure value; S3: the control system instructs the execution device (2) to generate an action according to a predetermined program and feeds back all input variables and output variables in the process to the control system; S4: If all the preset temperature values ​​to be detected have not been completed, S1 is executed, and the control system is adjusted to the next preset temperature value. If all the preset temperature values ​​to be detected have not been completed, S5 is executed; S5: If all the preset pressure values ​​to be detected have not been completed, S2 is executed, and the control system is adjusted to the next preset pressure value. If all the preset pressure values ​​to be detected have been completed, S6 is executed; S6: The control system records all data, updates parameters in the material model, and completes the test of the magnetostrictive material (21) to be tested.

2. The temperature and pressure influence testing method of magnetostrictive material according to claim 1, characterized in that: The actuator (2) is arranged inside the heat-insulating box (1), and is provided with a magnetostrictive material to be measured (21), a temperature detection component (23), and an energy input component (22) arranged along the circumference of the magnetostrictive material to be measured (21).

3. The temperature and pressure influence testing method of magnetostrictive material according to claim 2, characterized in that: The pressure loading device (3) is connected to the execution device (2) and directly applies pressure to a sample of the magnetostrictive material (21) to be tested.

4. The temperature and pressure influence testing method of magnetostrictive material according to claim 1, characterized in that: In S1, the preset temperature value T1 of the heat-insulating box (1) and the temperature value T2 of the magnetostrictive material have the following relationship: T2=a0+a1*T1 Among them: a1 is the environmental impact coefficient, a0 is the correction coefficient, and the values ​​of a0 and a1 are calculated and saved by the control system.

5. The method for testing the influence of temperature and pressure on magnetostrictive materials according to claim 1, characterized in that: The input variable is implemented by the control system commanding the energy input component (22) to apply it to the actuator (2).

6. The method for testing the influence of temperature and pressure on magnetostrictive materials according to claim 5, characterized in that: The input variables include any one or any combination of current, voltage, and magnetic field, and are calculated by the control system as input magnetic fields and substituted into the material model.

7. The temperature and pressure influence testing method of magnetostrictive material according to claim 1, characterized in that: The output variables include any one or any combination of magnetic flux, displacement, strain and force, which are fed back to the control system by the output detection device (4) and calculated as output magnetic flux and strain and substituted into the material model.

8. The method for testing the influence of temperature and pressure on magnetostrictive materials according to claim 7, characterized in that: The material model in the control system is as follows: Among them, ε is the output strain, B is the output magnetic flux, P is the input pressure, H is the input magnetic field, and the control system can be solved through the set value and the detection value; s is the flexibility coefficient, d is the piezomagnetic coefficient, μ is the magnetic permeability coefficient, α is the thermal expansion coefficient, β is the thermomagnetic coefficient, and is the material parameter under the current input temperature value T1 and the preset pressure value P.

9. The method for testing the influence of temperature and pressure on magnetostrictive materials according to claim 8, characterized in that: The output detection device (4) comprises one or more displacement, stress or strain sensors, and the output detection device (4) is installed outside the heat-insulating box (1) or inside the actuator (2).

10. The temperature and pressure influence testing method of magnetostrictive material according to claim 1, characterized in that: The heat-insulating box (1) can be directly used in conjunction with an output detection device (4) to measure the material properties of a magnetostrictive material (21) to be measured at different temperatures.

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