Clamping device for realizing topological interface state of thermomagnetic adjustable photonic crystal beam

Abstract

The utility model discloses a clamping device for achieving the topological interface state of a thermomagnetic adjustable photonic crystal beam, and belongs to the technical field of novel functional materials.The clamping device for achieving the topological interface state of the thermomagnetic adjustable photonic crystal beam comprises an optical platform, and two vertical rods and four threaded rods are installed on the optical platform in a threaded mode; cross rods capable of reciprocating up and down are installed outside the two vertical rods, the two vertical rods are vertically arranged, cross jackscrew fixing clamps are installed outside the two cross rods in a sliding mode, an acrylic circular pipe is installed between the cross jackscrew fixing clamps, the acrylic circular pipe is sleeved with a plurality of small annular magnets and large annular magnets, and the small annular magnets and the large annular magnets are connected with the cross jackscrew fixing clamps in a sliding mode. And the two parts are separated by an acrylic circular ring. The topological interface state of the structure can be induced by changing the controllable external magnetic field without changing the structure of the magnetostrictive photonic crystal beam, so that the position adjustability of the topological interface state can be realized by adjusting the size of the external magnetic field, and the adjusting characteristic of the photonic crystal system on the topological interface state is greatly expanded.

Description

Technical Field

[0001] The present application belongs to the technical field of novel functional materials, and in particular relates to a clamping device for realizing a topological interface state of a thermomagnetic adjustable phononic crystal beam. Background Art

[0002] Phononic crystals are acoustic metamaterials with periodic arrangement of geometric structures or physical parameters. They have properties such as pass / gap bands, defect states, and directional propagation. They can be an effective research tool for regulating elastic waves / acoustic waves and have important application value in the fields of vibration reduction and isolation, noise suppression, and energy capture.

[0003] Directional transmission of elastic waves and energy flow control are the core contents of phononic crystal research. When elastic waves propagate to boundaries or defects, there is often a strong scattering loss effect, which greatly affects the transmission effect and has certain limitations. Topological insulators based on phononic crystals can achieve low-loss or even lossless directional transmission of elastic waves, and have characteristics such as "backscattering suppression" and "defect immunity". However, most phononic crystals currently do not have the characteristics of non-contact active regulation of elastic wave topological transmission. At the same time, when phononic crystal devices serve in complex medium environments, their working performance is affected by external loads such as magnetic fields and stress. Dynamically regulating the topological transmission characteristics of elastic waves without changing the structure, or compensating for changes caused by external factors to improve device stability, will become a research hotspot for tunable topological phononic crystals.

[0004] In addition, the external magnetic field has been used as a non-contact adjustment method to control the topological interface state of Lamb waves in one-dimensional magnetoelastic phononic crystal plates. However, the working frequency and magnetic field range applicable to the current research are too high, and it is difficult to verify it experimentally. Magnetostrictive materials, as a typical ferromagnetic smart material, can change their own magnetization state and cause changes in length or volume when an external magnetic field is applied. Due to their large magnetostrictive strain and other characteristics, they have been widely used in recent years. To this end, we introduced magnetostrictive materials to form a one-dimensional phononic crystal beam, and realized the magnetically controlled adjustable interface state of the longitudinal wave in it, and proposed a clamping device for realizing the topological interface state of the thermomagnetic adjustable phononic crystal beam. Utility Model Content

[0005] The purpose of the present application is to solve the above-mentioned related problems and to propose a clamping device for realizing the topological interface state of a thermomagnetic adjustable phononic crystal beam.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] A clamping device for realizing the topological interface state of a thermomagnetic adjustable phononic crystal beam comprises an optical platform, on which two vertical poles and four threaded rods are threadedly installed, a cross bar that can reciprocate up and down is installed on the outside of the two vertical poles, and the two are arranged vertically, a cross top screw fixing clamp is slidably installed on the outside of the two cross bars, an acrylic round tube is installed between the two, the outside of the acrylic round tube is covered with a plurality of small annular magnets and a large annular magnet, and the two are separated by an acrylic ring, and an upper aluminum alloy CNC thermal plate and a lower aluminum alloy CNC thermal plate are threadedly installed between the four threaded rods, and are located above and below the acrylic round tube.

[0008] As a further description of the above technical solution:

[0009] The outsides of the two vertical poles are slidably mounted with cross clamps, the two cross bars are respectively mounted on one side of the outsides of the two cross clamps, and the openings on both sides of the two cross clamps are threadedly mounted with bolts.

[0010] As a further description of the above technical solution:

[0011] The upper and lower parts of the exteriors of the two cross screw fixing clamps are both threadedly mounted with plum blossom knobs, which are respectively top-connected with the acrylic round tube and the cross bar.

[0012] As a further description of the above technical solution:

[0013] The small annular magnet and the large annular magnet have different diameters.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are:

[0015] 1. In the present application, the topological interface state of the structure can be induced by changing the controllable external magnetic field without changing the structure of the magnetostrictive phononic crystal beam, so the position adjustability of the topological interface state can be achieved by adjusting the size of the external magnetic field, which greatly broadens the regulation characteristics of the phononic crystal system on the topological interface state.

[0016] 2. In this application, the realization frequency of the topological interface state can be dynamically adjusted by adjusting the external magnetic field and using a temperature controller to change the working temperature of the phononic crystal structure, and the service status of the structure in a complex environment is observed, realizing an important transformation from the single frequency of the traditional topological phononic crystal to the continuously adjustable frequency range of the current system. This greatly improves the performance of related acoustic devices and also provides an important idea for the design of intelligent and adjustable longitudinal wave devices (magnetically adjustable frequency selectors). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a first-perspective schematic diagram of the overall structure of this application;

[0018] Figure 2 A second perspective diagram of the overall structure of this application;

[0019] Figure 3 For this application Figure 1 Schematic diagram of the internal structure;

[0020] Figure 4 System diagram for use in this application.

[0021] In the figure:

[0022] 1. Optical platform; 2. Vertical pole; 3. Threaded rod; 4. Upper aluminum alloy CNC thermal plate; 5. Lower aluminum alloy CNC thermal plate; 6. Cross bearing clamp; 7. Bolt; 8. Cross top screw fixing clamp; 9. Plum blossom knob; 10. Small ring magnet; 11. Acrylic ring; 12. Large ring magnet; 13. Cross bar; 14. Acrylic round tube. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] See also Figure 1-3 The present application provides a technical solution: a clamping device for realizing the topological interface state of a thermomagnetic adjustable phononic crystal beam, comprising an optical platform 1, on which two vertical rods 2 are threadedly installed, and a cross screw fixing clamp 8 that can reciprocate up and down is installed on the two vertical rods 2, and an acrylic round tube 14 is installed between the two cross screw fixing clamps 8, on which a plurality of annular magnets and acrylic rings 11 are sleeved, and the acrylic rings 11 separate the plurality of annular magnets, and an axial magnetic field is provided for the experiment through the annular magnets, and a magnetostrictive phononic crystal beam structure composed of a plurality of magnetostrictive materials and an aluminum alloy can be added to the acrylic round tube 14, and the position height of the acrylic round tube 14 can be conveniently adjusted.

[0025] Four threaded rods 3 are threadedly installed on the optical platform 1, and an upper aluminum alloy CNC thermal plate 4 and a lower aluminum alloy CNC thermal plate 5 are threadedly installed on the four threaded rods 3. The two are respectively located above and below the acrylic tube 14, which provide a suitable working space for the experiment, and the distance between the two aluminum alloy CNC thermal plates and the magnetic field can be adjusted according to actual conditions.

[0026] In the present application embodiment:

[0027] Reference Figure 1 , 2and 3, the annular magnet is divided into a small annular magnet 10 and a large annular magnet 12, both of which are circular and have different diameters.

[0028] In the present application embodiment:

[0029] Reference Figure 1 , 2 and 3, a cross bearing clamp 6 is slidably installed on the outside of the two vertical poles 2, a cross bar 13 is slidably installed on one end of the outside, and a cross top screw fixing clamp 8 is slidably installed on the cross bar 13, the vertical poles 2 and the cross bar 13 are arranged vertically, and bolts 7 are threadedly installed on both sides of the two cross bearing clamps 6. The position of the cross bearing clamp 6 can be fixed by tightening the bolts 7. By adjusting the position of the cross bearing clamp 6 and the cross bar 13, the position of the cross top screw fixing clamp 8 can be adjusted to meet the needs of use.

[0030] In the present application embodiment:

[0031] Reference Figure 1 , 2 3. The upper and lower parts of the two cross screw fixing clamps 8 are both threadedly installed with plum blossom knobs 9, which are respectively in contact with the acrylic tube 14 and the cross bar 13, and are used to fix the position of the cross screw fixing clamps 8 and the acrylic tube 14.

[0032] Working principle:

[0033] First, four threaded rods 3 are rotated on the black optical platform 1 to fix two aluminum alloy CNC thermal plates to appropriate positions, and then the main parts of the brackets on both sides are made of four threaded rods 3, two cross bearing clips 6 and two cross top screw fixing clips 8. The height of the cross bar 13 can be adjusted by rotating the bolt 7, and the depth position of the internal bracket can be adjusted by rotating the bolt 7 and the plum blossom knob 9. An acrylic round tube 14 is inserted into the other hole of the cross top screw fixing clips 8 at both ends. An annular magnet can be added to the outside of the acrylic round tube 14 to provide an axial magnetic field. The magnets are separated by acrylic rings 11, and a magnetostrictive phononic crystal beam structure composed of multiple magnetostrictive materials and aluminum alloy is added to the tube.

[0034] Secondly, we used commercial finite element software to calculate the spatial variation of the properties of the magnetoelastic layer of the phononic crystal unit cell under different magnetic fields, and observed its topological characteristics through numerical calculation of the Zak phase. In addition, we successfully realized the topological interface state of the longitudinal wave at the interface of the magnetostrictive phononic crystal beams of two different topological phases. On this basis, we placed an annular magnet to provide an axial magnetic field according to the magnetic field required for calculation. For the needs of different topological interface states, we only need to change the size and position of the annular magnet to realize the flexibly controllable longitudinal wave topological interface state. The actual magnetic field is measured with a Gaussmeter.

[0035] Next, the temperature of the aluminum alloy CNC thermal plate is regulated by the thermostat to provide the required working temperature for the structure, and the temperature field can be flexibly controlled by adjusting the temperature of the thermostat. The actual temperature field is obtained by the infrared thermal imager.

[0036] Finally, a transmission experiment of the longitudinal wave topological interface state is carried out. A sinusoidal frequency sweep signal is generated by the control system, and then amplified by the power amplifier and applied to the exciter. The input and output signals can be recorded by two accelerometers and a data logger, and the excitation frequency is swept:

[0037] T l =20log(A out / A in )

[0038] The frequency response function can be obtained, where A out and A in are the output amplitude and input amplitude respectively.

[0039] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A clamping device for realizing the topological interface state of a thermomagnetic tunable phononic crystal beam, characterized in that: The optical platform comprises an optical platform (1) on which two vertical rods (2) and four threaded rods (3) are threadedly mounted, and a cross rod (13) capable of reciprocating up and down is mounted on the outside of the two vertical rods (2), and the two are arranged vertically, and a cross screw fixing clamp (8) is slidably mounted on the outside of the two cross rods (13), and an acrylic round tube (14) is mounted between the two, and the outside of the acrylic round tube (14) is covered with a plurality of small annular magnets (10) and a large annular magnet (12), and the two are separated by an acrylic ring (11), and an upper aluminum alloy CNC thermal plate (4) and a lower aluminum alloy CNC thermal plate (5) are threadedly mounted between the four threaded rods (3), and are located above and below the acrylic round tube (14).

2. A clamping device for realizing the topological interface state of a thermomagnetic adjustable phononic crystal beam according to claim 1, characterized in that: The outside of the two vertical poles (2) are slidably mounted with a cross clamp (6), the two cross bars (13) are respectively mounted on one side of the outside of the two cross clamps (6), and the openings on both sides of the two cross clamps (6) are threadedly mounted with bolts (7).

3. A clamping device for realizing the topological interface state of a thermomagnetic adjustable phononic crystal beam according to claim 1, characterized in that: The upper and lower parts of the exteriors of the two cross screw fixing clamps (8) are both threadedly mounted with plum blossom knobs (9), which are respectively connected to the acrylic round tube (14) and the cross bar (13).

4. A clamping device for realizing the topological interface state of a thermomagnetic adjustable phononic crystal beam according to claim 1, characterized in that: The diameters of the small annular magnet (10) and the large annular magnet (12) are different.

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