Adjustable one-way non-reflection system

Abstract

The invention relates to an adjustable one-way non-reflection system which comprises a waveguide tube, a lossy bypass branch tube, an obstacle and a lossless bypass branch tube. The barrier is rotatably arranged in the center of the waveguide tube; the lossy side branch pipes and the lossless side branch pipes are symmetrically installed at the left end and the right end of the waveguide tube, the two lossy side branch pipes and the two lossless side branch pipes are symmetrically installed on the upper side and the lower side of the waveguide tube, and the two lossless side branch pipes are symmetrically installed on the upper side and the lower side of the waveguide tube. Compared with the prior art, the device has a singular point control function, is higher in adaptability and practicability, and has the advantages of simple structure, adjustability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of sound wave control, and in particular to an adjustable one-way non-reflective system. Background Art

[0002] In recent years, the study of non-Hermitian systems has revealed many novel physical phenomena, especially singularities, which are special merger points where eigenvalues ​​and their corresponding eigenvectors merge simultaneously. The concept of singularities, which originally originated from quantum mechanics, has been extended to classical wave physics, and in the field of acoustics, various phenomena such as one-way transparency and acoustic invisibility are realized through parity-time symmetry achieved by balancing gain and loss. However, due to factors such as material loss dispersion, the frequency of singularities is usually fixed. Recently, researchers have achieved flexible control of singularities by introducing active acoustic gain media or changing the geometry of the structure.

[0003] Nevertheless, current research still faces many challenges: parity-time symmetric systems rely on complex feedback mechanisms and active control devices, while passive systems require the design of special structures. These limitations seriously hinder the development of singularities in more complex applications such as acoustic direction sensing and logic gates. Summary of the invention

[0004] The purpose of the present invention is to provide an adjustable unidirectional non-reflection-free system in order to overcome the defects of the above-mentioned prior art that most traditional non-Hermitian systems are designed as fixed structures and lack the ability to be adjusted, which becomes a limitation in practical applications and cannot meet many requirements of practical applications.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An adjustable unidirectional non-reflection system comprises a waveguide, a lossy side branch, an obstacle and a lossless side branch;

[0007] The obstacle can be rotatably arranged at the center of the waveguide;

[0008] The lossy side branch tubes and the lossless side branch tubes are symmetrically installed at the left and right ends of the waveguide tube. The number of the lossy side branch tubes and the lossless side branch tubes are both two. The two lossy side branch tubes are symmetrically installed at the upper and lower sides of the waveguide tube, and the two lossless side branch tubes are symmetrically installed at the upper and lower sides of the waveguide tube.

[0009] Preferably, the waveguide comprises a first transverse side, a first vertical side, a second transverse side and a second vertical side connected end to end in sequence, the first transverse side is parallel to the second transverse side, and the first vertical side is parallel to the second vertical side.

[0010] Preferably, the lossy side branch tube includes a third horizontal side, a third vertical side, a fourth horizontal side and a fourth vertical side connected end to end in sequence, the third horizontal side is distributed parallel to the fourth horizontal side, the third vertical side is distributed parallel to the fourth vertical side, and the third horizontal side matches the horizontal side shape of the waveguide tube.

[0011] Preferably, the lossless bypass tube includes a fifth horizontal side, a fifth vertical side, a sixth horizontal side and a sixth vertical side connected end to end in sequence, the fifth horizontal side is distributed parallel to the sixth horizontal side, the fifth vertical side is distributed parallel to the sixth vertical side, and the fifth horizontal side matches the horizontal side shape of the waveguide tube.

[0012] Preferably, the obstacle includes a seventh horizontal side, a seventh vertical side, an eighth horizontal side and an eighth vertical side connected end to end in sequence, the seventh horizontal side is parallel to the eighth horizontal side, the seventh vertical side is parallel to the eighth vertical side, and the rotation angle of the obstacle is adjustable.

[0013] Preferably, the included angle between the eighth vertical side of the obstacle and the first horizontal side of the waveguide is in the range of 0-90 degrees.

[0014] Preferably, the waveguide tube, the lossy side branch tube and the lossless side branch tube are all made of organic glass.

[0015] Preferably, the obstacle is made of epoxy resin.

[0016] Preferably, the waveguide tube, the lossy side branch tube, the obstacle and the lossless side branch tube are all integrally formed by 3D printing or wire cutting.

[0017] Preferably, the reflection coefficient of the end of the waveguide close to the lossy side branch is close to 0.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) This solution achieves flexible control of the system singularity by adding a rotatable component to the waveguide structure to adjust the system's gradient index. This design links the system singularity adjustment with a simple structural parameter, namely the rotation angle of the obstacle, greatly simplifying the operation process. Compared with the traditional complex multi-parameter adjustment method, this single-parameter control method is not only more intuitive, but also has higher stability and repeatability, making it easier for the system to achieve dynamic adjustment and adapt to diverse application needs.

[0020] (2) Unlike traditional PT symmetric systems that rely on active gain and complex feedback mechanisms, this system adopts a purely passive design and does not require any active control devices. This design avoids the reliance on high-precision electronic devices, reduces the difficulty and cost of implementation, and improves the reliability of the system. The passive design also makes the system more suitable for promotion in practical applications with limited resources or complex environments, providing a more practical solution for the research and practical engineering applications of non-Hermitian wave phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the adjustable one-way non-reflective system provided by the present invention;

[0022] Figure 2 A top view of the adjustable one-way non-reflective system provided by the present invention;

[0023] Figure 3 A left reflection coefficient diagram of the adjustable one-way non-reflective system provided by the present invention;

[0024] Figure 4 A left reflection phase diagram of the adjustable one-way non-reflection system provided by the present invention;

[0025] Figure 5 A diagram of the sound pressure amplitude at a certain frequency of the adjustable one-way non-reflective system provided by the present invention;

[0026] Figure 6 A diagram of the sound pressure amplitude at a certain frequency of the adjustable one-way non-reflective system provided by the present invention;

[0027] Figure 7 A sound pressure amplitude diagram at another frequency of the adjustable one-way non-reflection system provided by the present invention;

[0028] Figure 8 A simulated and experimental reflection coefficient diagram of the adjustable one-way non-reflective system provided by the present invention at a certain rotation angle;

[0029] Fig. 9 Simulated and experimental reflection phase diagrams at a certain rotation angle of the controllable one-way non-reflective system provided by the present invention;

[0030] Fig.10 A simulated and experimental reflection coefficient diagram of the adjustable one-way non-reflective system provided by the present invention at a certain rotation angle;

[0031] Fig.11 Simulated and experimental reflection phase diagrams at a certain rotation angle of the controllable one-way non-reflective system provided by the present invention;

[0032] Fig.12A simulated and experimental reflection coefficient diagram of the controllable one-way non-reflective system provided by the present invention at another rotation angle;

[0033] Fig.13 A simulated and experimental reflection phase diagram of the controllable one-way non-reflective system provided by the present invention at another rotation angle;

[0034] In the figure: 1, waveguide, 2, lossy side branch, 3, obstacle, 4, lossless side branch, 11, first horizontal side, 12, first vertical side, 13, second horizontal side, 14, second vertical side. 21, third horizontal side, 22, third vertical side, 23, fourth horizontal side, 24, fourth vertical side, 31, seventh horizontal side, 32, seventh vertical side, 33, eighth horizontal side, 34, eighth vertical side. 41, fifth horizontal side, 42, fifth vertical side, 43, sixth horizontal side, 44, sixth vertical side. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] Example 1

[0042] like Figure 1 and Figure 2 As shown, this embodiment provides an adjustable one-way non-reflection system, including a waveguide 1, a lossy side branch 2, an obstacle 3 and a lossless side branch 4;

[0043] The obstacle 3 can be rotatably arranged at the center of the waveguide 1;

[0044] The lossy side branch tube 2 and the lossless side branch tube 4 are symmetrically installed at the left and right ends of the waveguide tube 1. The number of the lossy side branch tubes 2 and the lossless side branch tubes 4 are both two. The two lossy side branch tubes 2 are symmetrically installed on the upper and lower sides of the waveguide tube 1, and the two lossless side branch tubes 4 are symmetrically installed on the upper and lower sides of the waveguide tube 1.

[0045] Specifically, the waveguide 1 includes a first horizontal side 11, a first vertical side 12, a second horizontal side 13 and a second vertical side 14 connected end to end in sequence, the first horizontal side 11 and the second horizontal side 13 are arranged in parallel, and the first vertical side 12 and the second vertical side 14 are arranged in parallel.

[0046] Furthermore, the lossy side branch tube 2 includes a third horizontal side 21, a third vertical side 22, a fourth horizontal side 23 and a fourth vertical side 24 which are connected end to end in sequence, the third horizontal side 21 is parallel to the fourth horizontal side 23, the third vertical side 22 is parallel to the fourth vertical side 24, and the third horizontal side 21 matches the horizontal side shape of the waveguide tube 1.

[0047] Furthermore, the lossless bypass tube 4 includes a fifth horizontal side 41, a fifth vertical side 42, a sixth horizontal side 43 and a sixth vertical side 44 which are connected in sequence end to end, the fifth horizontal side 41 is parallel to the sixth horizontal side 43, the fifth vertical side 42 is parallel to the sixth vertical side 44, and the fifth horizontal side 41 matches the horizontal side shape of the waveguide tube 1.

[0048] Among them, the obstacle 3 includes a seventh horizontal side 31, a seventh vertical side 32, an eighth horizontal side 33 and an eighth vertical side 34 connected in sequence end to end, the seventh horizontal side 31 is parallel to the eighth horizontal side 33, the seventh vertical side 32 is parallel to the eighth vertical side 34, and the rotation angle of the obstacle 3 is adjustable.

[0049] Specifically, the included angle between the eighth vertical side 34 of the obstacle 3 and the first horizontal side 11 of the waveguide 1 is in the range of 0-90 degrees.

[0050] The system adjusts the gradient index by adding a rotatable component to the waveguide 1 structure, thus achieving flexible control of the singular point. This design associates the singular point adjustment with a simple structural parameter, greatly simplifying the operation process. Compared with the traditional complex multi-parameter adjustment method, this single-parameter control method is not only more intuitive, but also has higher stability and repeatability, making it easier for the system to achieve dynamic adjustment and adapt to diverse application needs.

[0051] The adjustable one-way non-reflection system consists of a waveguide, a lossy side branch, an obstacle and a lossless side branch. The height of the waveguide is h1 and the width is w i , the height of the lossy branch is h2, the width is w, and the length of the obstacle is l o , with a width of w o The rotation angle is θ, which is the angle between the eighth vertical side 34 of the obstacle 3 and the first horizontal side 11 of the waveguide 1. The height of the lossless branch is h3, the width is w, and the distance between the lossy branch and the lossless branch is d. h1, w i 、h2、w、l o 、w o , h3 and d can be freely designed and adjusted according to actual conditions to meet the sound wave control needs of different frequency bands.

[0052] This embodiment obtains appropriate frequency and geometric parameters by theoretically calculating the left reflection matrix and the right reflection matrix of the entire system. According to the calculated structural parameters h1 = 5cm, w i =79.5cm,h2=8.75cm,w=2.5cm,l o =2.5cm,w o =0.5cm, h3=7.5cm, and d=62.5cm, and the rotation angle θ ranges from 0° to 90°.

[0053] like Figure 3 and Figure 4 As shown in the figure, the system can achieve control of the singular point by adjusting the rotation angle θ of obstacle 3. When the rotation angle changes from 0° to 90°, a reflection coefficient close to zero can be obtained at different frequencies. In addition, the reflection phase of the left incident light shows a sharp transition from -π to π.

[0054] Furthermore, if Figures 5 to 7 As shown, when the rotation angle θ is 0°, 45° and 90° respectively, the frequencies are 1050.3 Hz, 1042.3 Hz and 1034.1 Hz. For the incident sound wave on the left, the nearly uniform sound pressure amplitude distribution in the left area indicates the reflection-free propagation of the sound wave, while for the incident sound wave on the right, the obvious standing wave sound pressure amplitude distribution on the right side indicates that the sound wave has significant reflection.

[0055] Specifically, the waveguide 1, the lossy side branch 2, and the lossless side branch 4 are all made of organic glass. The material of the obstacle 3 is epoxy resin. The waveguide 1, the lossy side branch 2, the obstacle 3, and the lossless side branch 4 are all integrally formed by 3D printing or wire cutting. The waveguide 1, the lossy side branch 2, the obstacle 3, and the lossless side branch 4 are easy to process, so that they are integrally formed to improve the manufacturing efficiency and the accuracy of the structural dimensions.

[0056] Due to the adjustable design of the one-way non-reflective system, the system is expected to achieve singular points of different frequencies at different rotation angles. The present invention calculates and measures the reflection coefficient and reflection phase at different rotation angles θ. Figures 8 to 13 As shown in the figure, when the rotation angle θ is 0°, 45° and 90° respectively, the system can achieve unidirectional non-reflection on the left side at a specific frequency, and maintain significant reflection on the right side. In addition, the reflection phase on the left side shows a drastic change from -π to π, while the reflection phase of the incident right side remains almost unchanged. Therefore, the adjustable unidirectional non-reflection system proposed in the present invention can control the singularity point at different rotation angles without the need for additional power input.

[0057] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An adjustable one-way non-reflective system, characterized in that: It comprises a waveguide tube (1), a lossy side branch tube (2), an obstacle (3) and a lossless side branch tube (4); The obstacle (3) can be rotatably arranged at the center of the waveguide (1); The lossy side branch tube (2) and the lossless side branch tube (4) are symmetrically installed at the left and right ends of the waveguide tube (1); the number of the lossy side branch tube (2) and the number of the lossless side branch tube (4) are both two; the two lossy side branch tubes (2) are symmetrically installed at the upper and lower sides of the waveguide tube (1); and the two lossless side branch tubes (4) are symmetrically installed at the upper and lower sides of the waveguide tube (1).

2. The controllable one-way non-reflective system according to claim 1, characterized in that: The waveguide (1) comprises a first transverse side (11), a first vertical side (12), a second transverse side (13) and a second vertical side (14) which are connected end to end in sequence, the first transverse side (11) and the second transverse side (13) are arranged in parallel, and the first vertical side (12) and the second vertical side (14) are arranged in parallel.

3. The controllable one-way non-reflective system according to claim 2, characterized in that: The lossy side branch tube (2) comprises a third transverse side (21), a third vertical side (22), a fourth transverse side (23) and a fourth vertical side (24) which are connected in sequence end to end; the third transverse side (21) and the fourth transverse side (23) are arranged in parallel; the third vertical side (22) and the fourth vertical side (24) are arranged in parallel; and the third transverse side (21) matches the transverse side shape of the waveguide tube (1).

4. The controllable one-way non-reflective system according to claim 2, characterized in that: The lossless bypass tube (4) comprises a fifth transverse side (41), a fifth vertical side (42), a sixth transverse side (43) and a sixth vertical side (44) which are connected end to end in sequence; the fifth transverse side (41) and the sixth transverse side (43) are arranged in parallel; the fifth vertical side (42) and the sixth vertical side (44) are arranged in parallel; and the fifth transverse side (41) matches the transverse side shape of the waveguide tube (1).

5. The controllable one-way non-reflective system according to claim 1, characterized in that: The obstacle (3) comprises a seventh horizontal side (31), a seventh vertical side (32), an eighth horizontal side (33) and an eighth vertical side (34) which are connected end to end in sequence; the seventh horizontal side (31) and the eighth horizontal side (33) are arranged in parallel, the seventh vertical side (32) and the eighth vertical side (34) are arranged in parallel, and the rotation angle of the obstacle (3) is adjustable.

6. The controllable one-way non-reflective system according to claim 1, characterized in that: The included angle between the eighth vertical side (34) of the obstacle (3) and the first horizontal side (11) of the waveguide (1) is in the range of 0-90 degrees.

7. The controllable one-way non-reflective system according to claim 1, characterized in that: The waveguide tube (1), the lossy side branch tube (2) and the lossless side branch tube (4) are all made of organic glass.

8. The controllable one-way non-reflective system according to claim 1, characterized in that: The material of the obstacle (3) is epoxy resin.

9. The controllable one-way non-reflective system according to claim 1, characterized in that: The waveguide tube (1), the lossy side branch tube (2), the obstacle (3) and the lossless side branch tube (4) are all integrally formed by 3D printing or wire cutting.

10. The controllable one-way non-reflective system according to claim 1, characterized in that: The reflection coefficient of one end of the waveguide (1) close to the lossy side branch (2) is close to 0.

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