Electric drive memory alloy wire splicing array type space variable stiffness topological structure

Abstract

An electrically-driven memory alloy wire splicing array type space variable stiffness topological structure is composed of a double-end stud, a nut, an insulation paper gasket, a glass fiber pipe, a wire clamping aluminum sleeve, an inner plate, an outer plate and a memory alloy wire. The overall structural stiffness is preliminarily adjusted in the mode that the double-end stud and the nut for connecting the double-end stud and the plate are screwed to adjust the distance between the plates; the overall structural rigidity is accurately controlled by supplying power to the memory alloy wires; the memory alloy wires and the plate are installed and connected in an insulating mode through the glass fiber pipes, the insulating paper gaskets and the wire clamping aluminum sleeves, the connection mode is simple and firm, one or more memory alloy wires can be independently powered on, and therefore the overall structural rigidity can be more accurately regulated and controlled; the outer plates are cross-shaped plates with the same structural size, the inner plates are straight-line-shaped plates with the same structural size, and all unit structures can be spliced through connecting plates in the space, so that the unit structures can be arbitrarily topological in the up-down direction, the front-back direction and the left-right direction.

Description

Technical Field

[0001] The invention relates to a variable stiffness structure, in particular to an electrically driven memory alloy wire splicing array type space variable stiffness topological structure. Background Art

[0002] Shape memory alloy is a special kind of smart material, among which the most widely used is nickel-titanium shape memory alloy, which has good shape memory effect and superelasticity, and can return to a predetermined shape at a specific temperature. The shape memory effect of shape memory alloy comes from its phase change behavior. This type of alloy is in the austenite phase at high temperature and transforms into the martensite phase at low temperature. When the alloy is deformed in the martensite phase, if it is heated to a high temperature, the material will return to its original austenite shape. Due to its unique properties, shape memory alloys are widely used in medical devices, aerospace, construction engineering and other fields.

[0003] A variable stiffness structure is a structure that can dynamically adjust its stiffness characteristics according to the external environment or load conditions. Its basic principle is to adjust the stiffness of the material or structure to adapt to different working conditions or requirements. This adjustment can be achieved in many ways, including phase change of the material, change of geometric shape, and external control mechanism. Variable stiffness structures have important applications in many fields. For example, in the aerospace field, they are used for wings, tails and other components of aircraft and spacecraft to improve flight performance and safety; in construction engineering, they are used for seismic structures and adaptive buildings to enhance the seismic resistance and adaptability of the structure. At present, the realization method of variable stiffness structure mainly uses the characteristics of smart materials such as shape memory alloys, piezoelectric materials and phase change materials that can change stiffness under external stimulation (such as temperature, electric field, etc.), thereby changing the stiffness of the overall structure. However, research in these areas is still in its infancy, and related technologies need to be further improved and optimized. More in-depth research is needed in material development, optimization design, control strategy and other aspects. Therefore, the design of a variable stiffness topological structure with simple structure, high reliability and easy control is of great significance for solving existing problems and improving and optimizing related technologies.

[0004] In summary, an electrically driven memory alloy wire splicing array type space variable stiffness topological structure first preliminarily adjusts the overall structural stiffness by screwing the nut connecting the stud and the plate to adjust the distance between the plates, and then accurately controls the overall structural stiffness by supplying power to the memory alloy wire, and adopts a splicable space topological array method. The present invention is used to solve the problems of difficulty in stiffness control and size limitation of variable stiffness structures, can reduce processing costs, and is simple to install and operate, and has great theoretical research significance. Summary of the invention

[0005] The purpose of the present invention is to provide an electrically driven memory alloy wire splicing array type spatial variable stiffness topological structure. The entire unit structure is centrally symmetrical, the planes where the inner plate and the outer plate are located are parallel to each other, and all the memory alloy wires are parallel to each other and perpendicular to the planes of the inner and outer plates; the overall structural stiffness is preliminarily adjusted by adjusting the distance between the plates by screwing the nut, and then the overall structural stiffness is accurately controlled by supplying power to the memory alloy wire. In addition, after several unit structures are manufactured separately, they can be spliced ​​together using connecting plates to achieve the purpose of spatial topology.

[0006] The present invention is achieved through the following technical solutions:

[0007] The unit structure of an electrically driven memory alloy wire splicing array type space variable stiffness topological structure is mainly composed of two inner plates and two outer plates. The inner plate is divided into an upper inner plate and a lower inner plate, and the outer plate is also divided into an upper outer plate and a lower outer plate. Since the unit structure is centrally symmetrical, the upper and lower parts of the inner and outer plates are interchangeable. In addition, the inner and outer plates are parallel to each other and do not directly contact each other, but are connected by memory alloy wires, studs and nuts. All memory alloy wires are parallel to each other and perpendicular to the planes of the inner and outer plates, and are insulated and installed and connected to the plates through glass fiber tubes, insulating paper gaskets, and wire clamping aluminum sleeves. The overall structural stiffness is preliminarily adjusted by adjusting the distance between the plates by screwing the nuts, and then the overall structural stiffness is accurately controlled by supplying power to the memory alloy wires. All outer plates are of the same size, and all inner plates are of the same size. The completed unit structure can be spliced ​​in space through connecting plates, so as to have any topology in the up-down, front-back, left-right directions.

[0008] The advantages of the present invention are: first, the overall structural stiffness is preliminarily adjusted by adjusting the distance between the plates by screwing the nut, and then the overall structural stiffness is accurately controlled by supplying power to the memory alloy wire. Secondly, the entire unit structure is centrally symmetrical, the inner plate and the outer plate are parallel to each other, the memory alloy wires are parallel to each other and perpendicular to the plane of the plate, the structure is simple and beautiful, and the installation is convenient. In addition, the memory alloy wires are all connected to the plate by insulating installation using glass fiber tubes, insulating paper gaskets, and wire clamping aluminum sleeves. This connection method is simple and firm and can realize the power supply of one or several memory alloy wires separately, so that the stiffness of the overall structure can be more accurately controlled. Finally, the sizes of the outer plates are the same, and the sizes of the inner plates are also the same. All complete unit structures can be spliced ​​in space in any topology along the up and down, front and back, left and right directions. The entire variable stiffness structure has a clear principle, a simple structure, low cost, and simple installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the overall unit structure

[0010] Figure 2Schematic diagram of the three-dimensional assembly of the unit structure

[0011] Figure 3 A cross-sectional view of the memory alloy wire installation method

[0012] Figure 4 The overall schematic diagram of the topological structure using a "I"-shaped connecting plate for splicing

[0013] Figure 5 The overall schematic diagram of the topological structure using an "L"-shaped connecting plate for splicing

[0014] Figure 6 Schematic diagram of the structure of the inner panel

[0015] Figure 7 Schematic diagram of the outer plate structure

[0016] Figure 8 The structural diagram of the "I"-shaped connecting plate

[0017] Fig. 9 The structural diagram of the "L" type connecting plate DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings.

[0019] Reference Figure 1 The present invention provides an electrically driven shape memory alloy wire splicing array type spatial variable stiffness topological structure, which first adjusts the distance between the plates by screwing the nuts used to connect the studs and the plates, thereby changing the preload force on the memory alloy wire, thereby fine-tuning the stress of the memory alloy wire, and then preliminarily regulating the stiffness of the overall structure, and then applying current to the shape memory alloy wire, thereby precisely controlling the stress and stiffness of the memory alloy wire, and then being able to accurately regulate the stiffness of the overall structure.

[0020] Reference Figure 1 and Figure 2 The unit structure is composed of 8 parts, namely, studs (1), nuts (2), inner plates (3), glass fiber tubes (4), memory alloy wires (5), outer plates (6), insulating paper gaskets (7), and wire clamping aluminum sleeves (8).

[0021] Reference Figure 1 , Figure 2 , Figure 3For the assembly of the unit structure, the first step is to use studs and nuts to connect the upper outer plate with the lower inner plate to form a square closed loop, and then use the upper inner plate to pass through the previous square closed loop, and use studs and nuts again to connect the lower outer plate with the upper inner plate that previously passed through the square closed loop to form another square closed loop, so that the two square closed loops are buckled together to form the basic framework of the unit structure; the second step is to cut the fiberglass tube used for insulation to make its length consistent with the thickness of the board, and then install it into all the pre-reserved through holes on the board and glue it with glue, and then use glue again to stick the insulating paper gasket on the board, and its sticking position is at all places where the fiberglass tube is installed on the board, and Paste it on the upper plate surface of the upper outer plate, the lower plate surface of the lower outer plate, the lower plate surfaces at both ends of the upper inner plate and the upper plate surface in the middle, the upper plate surfaces at both ends of the lower inner plate and the lower plate surface in the middle; the third step, pass the memory alloy wire of measured length through one end of the inner hole of the previously installed glass fiber tube, and then put the wire clamping aluminum sleeve on one end of the memory alloy wire, so that the axial end of the aluminum sleeve contacts the insulating paper gasket, and use hydraulic pliers to clamp the aluminum sleeve into a shape similar to an elliptical cylinder to ensure that the memory alloy wire will not slip off, and use the same operation method in the third step for the other end of the memory alloy wire; finally, repeat the operation in the third step to complete the installation of all the memory alloy wires in the unit structure, thereby completing the installation of a unit structure.

[0022] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9All outer plates have the same size, which is a "cross" type plate, and all inner plates have the same size, which is a "one" type plate, and the structures of the two are very simple and easy to process and manufacture. After several unit structures are manufactured, the manufactured unit structures are spliced ​​together along the up-down, front-back, left-right directions through "I"-shaped connecting plates, bolts, nuts and two connecting holes reserved at the ends of the outer plates. At this time, the planes of the inner and outer plates of all the unit structures used for splicing are parallel to each other. In this process, when splicing along the up-down direction, in order to prevent the stud ends and the wire clamping aluminum sleeve on one outer plate from interfering with the outer plate on the other side, when designing the outer plate structure, the corresponding positions of the outer plates are thickened and processed with larger diameter holes, so that the stud ends and the wire clamping aluminum sleeves on both outer plates can pass through the holes at the corresponding positions of the other outer plate, thereby solving the interference problem; in addition, one of the unit structures can be used as the center, and the remaining unit structures can be spliced ​​together in the front-back, left-right directions through "L"-shaped connecting plates, bolts, nuts and two connecting holes reserved at the ends of the outer plates. At this time, the planes of the inner and outer plates of the unit structure used for splicing are perpendicular to the planes of the inner and outer plates of the unit structure as the center. Finally, these two splicing methods are used to achieve the purpose of spatial topology, and these two topological methods can be disassembled and combined at any time.

[0023] The above examples illustrate the technical concept and structural features of the patent of the present invention, with the aim of enabling scientific researchers and engineering technicians conducting research in this field to understand the patent of the present invention and to be able to implement the product accordingly.

Claims

1. An electrically driven memory alloy wire splicing array type spatial variable stiffness topological structure, characterized in that: This variable stiffness topological structure based on electric-driven shape memory alloy wire is composed of eight parts, namely, a stud (1), a nut (2), an inner plate (3), a glass fiber tube (4), a shape memory alloy wire (5), an outer plate (6), an insulating paper gasket (7), and an aluminum wire sleeve (8).

2. An electrically driven memory alloy wire splicing array type spatial variable stiffness topological structure according to claim 1, characterized in that: The planes where the inner and outer panels are located are parallel to each other, the memory alloy wires are parallel to each other and perpendicular to the planes of the panels, the outer panels are all "cross"-shaped panels with the same structural dimensions, and the inner panels are all "I"-shaped panels with the same structural dimensions. All the manufactured unit structures can be spliced ​​in space through "L"-shaped connecting panels or "I"-shaped connecting panels to form any topological array along the up-down, front-back, left-right directions.

3. The electrically driven memory alloy wire splicing array spatial variable stiffness topological structure according to claim 1, characterized in that: First, the overall structural stiffness is preliminarily adjusted by adjusting the distance between the plates by screwing the nuts connecting the studs and the plates, and then the overall structural stiffness is precisely controlled by supplying power to the memory alloy wires. The memory alloy wires are insulated and connected to the metal plates through glass fiber tubes, insulating paper gaskets, and wire-clamping aluminum sleeves. This connection method is simple and firm and can realize individual power supply to one or several memory alloy wires, thereby more accurately regulating the stiffness of the overall structure.

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