An active deformation cell structure and its design method

Abstract

This application belongs to the field of intelligent deformable structures, and specifically relates to an actively deformable cell structure and its design method. The actively deformable cell structure includes: a wall panel comprising an upper wall panel and a lower wall panel, both of which have four wall panel connecting parts; a mounting frame is disposed at the center of the lower wall panel; four zero Poisson's ratio structural components, each having four structural component connecting parts, which are respectively connected to the wall panel connecting parts or the structural component connecting parts of adjacent zero Poisson's ratio structural components; a micro-gear motor equipped with a control circuit, the bottom end of which is fixedly mounted in the mounting frame, and a rolling bearing mounted at the top end; the micro-gear motor is connected to a power source via a power connection line; the bottom end of the screw sleeve assembly is connected to the rolling bearing, and the top end is connected to the center of the upper wall panel. This application has advantages such as repeatable cell assembly and precise controllable deformation.

Description

Technical Field

[0001] The present application belongs to the field of intelligent deformable body structures, and in particular relates to an active deformable cell structure and a design method thereof. Background Art

[0002] Intelligent variable-body structures are an emerging research field in recent years. They refer to structures that can produce adaptive deformations according to different service conditions to achieve the goals of improving structural performance, control performance, adaptability and reducing energy consumption. They can not only be applied to the design of high-altitude and long-endurance aircraft in the aerospace field, such as new-generation fighters, hypersonic aircraft, near-space aircraft, high-altitude and long-endurance reconnaissance aircraft, but also have wide applications in various types of local variable-body structures, such as adaptive submarine blades, intelligent rotor blades, adaptive air inlets, adaptive antennas, etc., which play an important role in improving the performance of aerospace equipment. Most traditional variable-body structures are realized by mechanism transmission, such as the flaperons of aircraft wings. The structural gaps they produce will not only affect flight efficiency, but also increase noise and fuel consumption. The ultra-light intelligent lattice structure is a new design concept proposed in recent years. It can achieve the seamless and smooth deformation requirements of adaptive structures, improve structural efficiency, and reduce weight. It has great application prospects in the field of variable-body structures.

[0003] One of the core designs of intelligent lattice structures is the design of active deformation cells. Currently, active deformation cell driving methods are mostly implemented using piezoelectric materials, shape memory alloys, etc., which are limited by the performance of the driving materials themselves. Current active deformation cannot be widely used in the design of large deformable structures due to the small cell deformation, long deformation lag time, and insufficient deformation control accuracy.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0005] The purpose of the present application is to provide an active deformable cell structure and a design method thereof to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A first aspect of the present application provides an actively deformable cell structure, comprising:

[0008] The wall plate comprises an upper wall plate and a lower wall plate, each of the upper wall plate and the lower wall plate has four wall plate connecting parts, and a mounting frame is arranged at the center of the lower wall plate;

[0009] The zero Poisson's ratio structural member comprises four, each of which has four structural member connection parts, wherein one structural member connection part of the four zero Poisson's ratio structural members is respectively connected to the four wall panel connection parts of the upper wall panel in a one-to-one correspondence, one structural member connection part of the four zero Poisson's ratio structural members is respectively connected to the four wall panel connection parts of the lower wall panel in a one-to-one correspondence, and the other two structural member connection parts of the zero Poisson's ratio structural member are respectively connected to the structural member connection parts of the adjacent zero Poisson's ratio structural members;

[0010] A micro reduction motor, wherein the micro reduction motor is provided with a control circuit, the bottom end of the micro reduction motor is fixedly mounted in the mounting frame, a rolling bearing is mounted on the top end of the micro reduction motor, and the micro reduction motor is connected to a power source via a power connection line;

[0011] A screw sleeve assembly, wherein the bottom end of the screw sleeve assembly is connected to the rolling bearing, and the top end is connected to the center of the upper wall plate.

[0012] In at least one embodiment of the present application,

[0013] The wall panel is square, and the wall panel connecting parts are respectively located at the four corners of the wall panel;

[0014] The zero Poisson's ratio structural member is square, and the structural member connecting portions are respectively located at four corner positions of the zero Poisson's ratio structural member.

[0015] In at least one embodiment of the present application, connecting plates are provided on the wall panel connection part and the structural member connection part, wherein the wall panel connection part and the structural member connection part, as well as the structural member connection part and the structural member connection part are connected by bolts.

[0016] In at least one embodiment of the present application, an assembly hole is further provided on the structural member connecting portion, and the assembly hole is used to connect with the zero Poisson's ratio structural member of the adjacent active deformation cellular structure.

[0017] In at least one embodiment of the present application, the zero Poisson's ratio structural member has a zero Poisson's ratio segment, and the two structural member connecting parts are connected by the zero Poisson's ratio segment. The zero Poisson's ratio segment is a symmetrical structure, including a first outer bending segment, an inner bending segment and a second outer bending segment connected in sequence.

[0018] In at least one embodiment of the present application, the wall panel is made of engineering plastic.

[0019] In at least one embodiment of the present application, the zero Poisson's ratio structural component is made of resin material.

[0020] In at least one embodiment of the present application, the wall panel and the zero Poisson's ratio structural member are manufactured by 3D printing.

[0021] In at least one embodiment of the present application, the screw and sleeve assembly includes a sleeve and a retractable screw, the sleeve is installed at the center of the upper wall plate, the bottom end of the retractable screw is connected to the rolling bearing, and the top end cooperates with the sleeve.

[0022] A second aspect of the present application provides a method for designing an active deformation cell structure, based on the active deformation cell structure as described above, comprising:

[0023] Step 1: Obtain the requirements for the active deformation cell structure, including deformation requirements, load requirements, and size requirements;

[0024] Step 2: Select the drive mode according to the requirements, and select the micro reduction motor and design the drive connection mode;

[0025] Step 3: Design zero Poisson's ratio structural parts and connection methods according to the requirements;

[0026] Step 4: Establish a finite element model based on the theoretically designed zero Poisson's ratio structural parts and connection methods, and optimize the details through deformation capacity and load-bearing capacity;

[0027] Step 5: Select 3D printing materials to print wall panels and zero Poisson's ratio structural parts, connect them with bolts to form active deformation cell samples, and perform functional verification.

[0028] The invention has at least the following beneficial technical effects:

[0029] The active deformable cell structure of the present application can realize the active deformation of the deformable structure. At the same time, this structure can realize continuous deformation of the deformable structure of any shape through the repeatable assembly of active deformable cells. The controllable active deformation of the structure within a certain range can be realized through the control of the control circuit, and the zero Poisson's ratio structural parts can realize the deformation of the structure in a pure single direction. It has the advantages of repeatable assembly of cells and precise controllable deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an active deformation cell structure according to an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of an upper wall plate of an actively deformable cellular structure according to an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a lower wall plate of an actively deformable cellular structure according to an embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of a zero Poisson's ratio structural member of an active deformable cellular structure according to an embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the stretching deformation of an active deformable cell structure according to an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of compression deformation of an actively deformable cell structure according to an embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of the assembly of an active deformation cell structure according to an embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of the intelligent deformable body structure before and after deformation of an embodiment of the present application.

[0038] in:

[0039] 1-upper wall plate; 2-zero Poisson's ratio structural member; 3-screw sleeve; 4-retractable screw; 5-rolling bearing; 6-micro reduction motor; 7-bolt; 8-assembly hole; 9-lower wall plate; 10-power connection line. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0042] The following is combined with Figures 1 to 8 This application is described in further detail.

[0043] The first aspect of the present application provides an active deformation cell structure, including: a wall panel, a zero Poisson's ratio structural member 2, a micro reduction motor 6, and a screw and sleeve assembly.

[0044] like Figure 1 As shown, the wall panel is square, including an upper wall panel 1 and a lower wall panel 9 which are arranged opposite to each other. The upper wall panel 1 and the lower wall panel 9 each have four wall panel connecting parts, which are respectively located at the four corners of the wall panel. A mounting frame is fixedly provided at the center of the lower wall panel 9.

[0045] Each active deformation cell structure includes four zero Poisson's ratio structural members 2, each of which is square and has four structural member connection parts, respectively located at the four corner positions of the zero Poisson's ratio structural member 2. Among them, one structural member connection part of the four zero Poisson's ratio structural members 2 is connected to the four wall panel connection parts of the upper wall panel 1 in a one-to-one correspondence, one structural member connection part of the four zero Poisson's ratio structural members 2 is connected to the four wall panel connection parts of the lower wall panel 9 in a one-to-one correspondence, and the other two structural member connection parts of the zero Poisson's ratio structural members 2 are connected to the structural member connection parts of the adjacent zero Poisson's ratio structural members 2. In one embodiment of the present application, each active deformation cell structure includes four zero Poisson's ratio structural members, each of which includes a first structural member connection part, a second structural member connection part, a third structural member connection part and a fourth structural member connection part, wherein the first structural member connection part is arranged opposite to the third structural member connection part, and the second structural member connection part is arranged opposite to the fourth structural member connection part. The first structural member connecting portions of the four zero Poisson's ratio structural members are respectively connected one-to-one with the four wall panel connecting portions of the upper wall panel 1, the third structural member connecting portions of the four zero Poisson's ratio structural members are respectively connected one-to-one with the four wall panel connecting portions of the lower wall panel 9, the second structural member connecting portion of each zero Poisson's ratio structural member is respectively connected with the fourth structural member connecting portion of the adjacent zero Poisson's ratio structural member 2, and the fourth structural member connecting portion of each zero Poisson's ratio structural member is respectively connected with the second structural member connecting portion of the adjacent zero Poisson's ratio structural member 2.

[0046] Furthermore, the micro reduction motor 6 is provided with a control circuit, the bottom end of the micro reduction motor 6 is fixedly mounted in the mounting frame, the top end of the micro reduction motor 6 is mounted with a rolling bearing 5, and the micro reduction motor 6 is connected to the power supply via a power connection line 10; the screw sleeve assembly includes a sleeve 3 and a retractable screw 4, the sleeve 3 is mounted at the center of the upper wall plate 1, the bottom end of the retractable screw 4 is connected to the rolling bearing 5, and the top end is cooperatively connected to the sleeve 3.

[0047] In a preferred embodiment of the present application, Figure 2-4As shown, connecting plates are provided at the four corner positions of the wall panel connection part and the structural member connection part, and connecting holes for bolt connection are provided on the connecting plates, wherein the wall panel connection part and the structural member connection part, as well as the structural member connection part and the structural member connection part are connected by bolts 7. It can be understood that each connecting plate has an inclination angle of 45°, which is convenient for assembly with another connecting plate. In addition, each structural member connection part of the zero Poisson's ratio structural member 2 is also provided with an assembly hole 8, and the assembly hole 8 is used to connect the zero Poisson's ratio structural member 2 of the active deformation cell structure with the zero Poisson's ratio structural member 2 of the adjacent active deformation cell structure.

[0048] In a preferred embodiment of the present application, Figure 4 As shown, the zero Poisson's ratio structural member 2 has a zero Poisson's ratio segment, and the connecting parts of the two structural members are connected by the zero Poisson's ratio segment. The zero Poisson's ratio segment is a symmetrical structure, including a first outer bending segment, an inner bending segment and a second outer bending segment connected in sequence.

[0049] In the preferred embodiment of the present application, the upper wall plate 1 and the lower wall plate 9 are made of engineering plastics, such as PLA, and the zero Poisson's ratio structural member 2 is made of resin material, which can be manufactured by 3D printing and have a certain tensile and compressive deformation capacity. The screw sleeve assembly, rolling bearing 5, and micro reduction motor 6 are all standard parts.

[0050] The active deformation cell structure of the present application uses a micro-reduction motor 6 as the driver of the active deformation cell, and drives the retractable screw 4 to rotate through a rolling bearing 5. When the control circuit controls the micro-reduction motor 6 to rotate forward, the retractable screw 4 is screwed into the screw sleeve 3 installed on the upper wall plate 1, driving the zero Poisson's ratio structural member 2 to produce tensile deformation, thereby realizing the tensile deformation of the entire cell (such as Figure 5 As shown); when the control circuit controls the micro-reduction motor 6 to reverse, the retractable screw 4 is rotated out of the screw sleeve 3 installed on the upper wall plate 1, driving the zero Poisson's ratio structure 2 to produce compression deformation, thereby achieving the compression deformation of the entire cell (as shown Figure 6 By inputting the program into the control circuit, the cell deformation can be precisely controlled.

[0051] The active deformable cell structure of the present application, multiple active deformable cell structures can be assembled to obtain an intelligent deformable body structure, and its simple assembly diagram is as follows: Figure 7 As shown, the assembly between the active deformation cells is realized by bolt connection. When a single active deformation cell is deformed under the drive of the micro-reduction motor 6, the overall assembly structure will be deformed accordingly. According to the different deformation function requirements of the assembly, the micro-reduction motor 6 can control each cell in the assembly to produce different deformations, so as to achieve the purpose of arbitrary deformation of the deformable structure. Figure 8 Shown are schematic diagrams of the assembly before and after deformation.

[0052] The second aspect of the present application also provides a method for designing an active deformable cell structure, comprising:

[0053] Step 1: Obtain the requirements for the active deformation cell structure, including deformation requirements, load requirements, and size requirements;

[0054] Step 2: Select the drive mode according to the needs, and select the micro reduction motor and design the drive connection method;

[0055] Step 3: Design zero Poisson's ratio structural parts and connection methods according to requirements;

[0056] Step 4: Establish a finite element model based on the theoretically designed zero Poisson's ratio structural parts and connection methods, and optimize the details through deformation capacity and load-bearing capacity;

[0057] Step 5: Select 3D printing materials to print wall panels and zero Poisson's ratio structural parts, connect them with bolts to form active deformation cell samples, and perform functional verification.

[0058] The active deformable cell structure and the design method thereof of the present application can realize the autonomous driving and autonomous control of the deformation of a single cell, and theoretically can realize the repeatable assembly of a deformable structure of any shape, and can be widely used in various deformable structures; a zero Poisson's ratio structure is designed on the connecting part, and the deformation of the cell can be accurately controlled by the control circuit without causing deformation in other directions, which provides convenience for the design and assembly of the deformable structure and is highly practical; the drive required for the structure is a telescopic screw drive, the drive form is simple, and can be achieved by a micro drive motor, the overall weight is light, and the drive efficiency is high.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An active deformable cell structure, characterized in that: include: A wall panel, comprising an upper wall panel (1) and a lower wall panel (9), wherein the upper wall panel (1) and the lower wall panel (9) each have four wall panel connection portions, and a mounting frame is arranged at the center of the lower wall panel (9); The zero Poisson's ratio structural member (2) comprises four zero Poisson's ratio structural members (2), each of which has four structural member connection portions, wherein one structural member connection portion of the four zero Poisson's ratio structural members (2) is respectively connected to four wall panel connection portions of the upper wall panel (1) in a one-to-one correspondence, one structural member connection portion of the four zero Poisson's ratio structural members (2) is respectively connected to four wall panel connection portions of the lower wall panel (9) in a one-to-one correspondence, and the other two structural member connection portions of the zero Poisson's ratio structural member (2) are respectively connected to the structural member connection portions of adjacent zero Poisson's ratio structural members (2); A micro reduction motor (6), wherein the micro reduction motor (6) is provided with a control circuit, the bottom end of the micro reduction motor (6) is fixedly mounted in the mounting frame, the top end of the micro reduction motor (6) is provided with a rolling bearing (5), and the micro reduction motor (6) is connected to a power source via a power connection line (10); A screw sleeve assembly, wherein the bottom end of the screw sleeve assembly is connected to the rolling bearing (5), and the top end is connected to the center of the upper wall plate (1).

2. The active deformable cell structure according to claim 1, characterized in that: The wall panel is square, and the wall panel connecting parts are respectively located at the four corners of the wall panel; The zero Poisson's ratio structural member (2) is in the shape of a square, and the structural member connecting portions are respectively located at four corner positions of the zero Poisson's ratio structural member (2).

3. The active deformable cell structure according to claim 2, characterized in that: The wall panel connection part and the structural component connection part are both provided with connection plates, wherein the wall panel connection part and the structural component connection part, as well as the structural component connection part and the structural component connection part are both connected via bolts (7).

4. The active deformable cell structure according to claim 3, characterized in that: An assembly hole (8) is also provided on the structural component connection portion, and the assembly hole (8) is used to be connected to the zero Poisson's ratio structural component (2) of the adjacent active deformation cell structure.

5. The active deformable cell structure according to claim 4, characterized in that: The zero Poisson's ratio structural member (2) has a zero Poisson's ratio section, and the two structural member connecting parts are connected by the zero Poisson's ratio section. The zero Poisson's ratio section is a symmetrical structure, comprising a first outer bending section, an inner bending section and a second outer bending section which are connected in sequence.

6. The active deformable cell structure according to claim 1, characterized in that: The wall panels are made of engineering plastics.

7. The actively deformable cell structure according to claim 6, characterized in that: The zero Poisson's ratio structural component (2) is made of resin material.

8. The actively deformable cellular structure according to claim 7, characterized in that: The wall panel and the zero Poisson's ratio structural member (2) are manufactured by 3D printing.

9. The actively deformable cell structure according to claim 1, characterized in that: The screw sleeve assembly comprises a sleeve (3) and a retractable screw (4), wherein the sleeve (3) is mounted at the center of the upper wall plate (1), the bottom end of the retractable screw (4) is connected to the rolling bearing (5), and the top end is matched with the sleeve (3).

10. A method for designing an active deformable cell structure, based on the active deformable cell structure according to any one of claims 1 to 9, characterized in that: include: Step 1: Obtain the requirements for the active deformation cell structure, including deformation requirements, load requirements, and size requirements; Step 2: Select the drive mode according to the requirements, and select the micro reduction motor and design the drive connection mode; Step 3: Design zero Poisson's ratio structural parts and connection methods according to the requirements; Step 4: Establish a finite element model based on the theoretically designed zero Poisson's ratio structural parts and connection methods, and optimize the details through deformation capacity and load-bearing capacity; Step 5: Select 3D printing materials to print wall panels and zero Poisson's ratio structural parts, connect them with bolts to form active deformation cell samples, and perform functional verification.

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