WO2012020960A2

WO2012020960A2 - Multifunctional structure for use in space using lattice strengthening composite material

Info

Publication number: WO2012020960A2
Application number: PCT/KR2011/005780
Authority: WO
Inventors: 이주훈; 장태성; 서현석; 임재혁; 김원석
Original assignee: 한국항공우주연구원
Priority date: 2010-08-10
Filing date: 2011-08-09
Publication date: 2012-02-16
Also published as: KR101037346B1; WO2012020960A3

Abstract

The present invention relates to a multifunctional structure for use in space using a lattice strengthening composite material, and more particularly, to a lattice strengthening composite material, which is a cutting-edge structure technology, for use in space, comprising a rescue function, an electronic function, a heat conductivity function, and a radiation shielding and an electromagnetic interference shielding function, so as to provide various functions and have significantly reduced weight and more efficient usage of space, compared to the existing satellite structure, which has limited functions of load support and internal equipment protection. The present invention provides the multifunctional structure comprising: a lattice frame, which is formed by coupling a plurality of lattices; a surface member, which is coupled to one surface of the lattice frame; at least one electronic PCT for performing an electronic function, which is provided in the lattice space formed by the lattice frame and the surface member; and an electric wire, provided on the electronic PCB, for electronically relaying data and dividing power between a connector for dividing power with the outside and relaying data and the electronic PCB.

Description

Multifunctional Structure for Space Using Grid-Reinforced Composite Structures

The present invention relates to a multifunctional structure for space using a grid-reinforced composite structure, and more specifically, as an advanced space structure technology, structure functions, electronics, compared to existing satellite structures have only functions limited to load support and internal equipment protection. The present invention relates to a grid-reinforced composite multifunctional structure that not only provides various functions with functions, heat transfer function, radiation shielding and electronic interference shielding function, but also greatly improves weight saving and space utilization.

As a technique conventionally attempted for this purpose, there is a multifunctional structure technology proposed by David M. Barnett et al. (Ref: US Patent 6,061,243). The multi-functional structure is a technology in which a flexible electronic PCB composed of a multi-chip module is attached to a lightweight composite panel using an adhesive material, and a radiation shielding and electronic interference shielding function is realized by covering the electronic PCB with a tungsten or tantalum foil. The electronic PCB is bonded on the structural panel. Electronic PCBs composed of multi-chip modules have the advantage of miniaturization, but have a disadvantage of requiring high costs in the manufacturing process.

Here, the implementation of an electronic circuit using a multi-chip module is effective for mass production of mass production stages, but it is very disadvantageous in terms of cost and many difficulties when manufacturing extremely limited quantities such as satellite electronic units.

In addition, since the electronic PCB is placed on the structural panel, it is impossible to attach other equipment to the electronic PCB attachment site, thereby not maximizing space utilization.

In addition, when dissipating heat generated from an electronic PCB attached to a face plate to a space environment (3K), heat must be transferred from the face plate of the structural panel to the face plate. At this time, the honeycomb core located between the face plate and the face plate of the structural panel is very small in cross-section is not effective in terms of heat transfer.

The present invention is to minimize the volume occupied by the electronic portion outside the structure by inserting the electronic PCB integral to perform the electronic function in the structure. Therefore, it does not require the electronic box housing used to mount the electronic PCB, the weight saving effect can be obtained by the removal of the electronic box housing. This configuration is achieved by using a grid reinforced composite panel as a satellite structure, using the space between adjacent grids as the electronic PCB insertion area.

In addition, the grid reinforcement panel is generally very excellent in stiffness and strength, it is intended to take advantage of the advantage that the structure itself can be made lightweight by applying a composite material. Instead of using an electronic box housing, an electronic interference shielding protective cover is used to safely accommodate the electronic PCB and shield the electronic interference. The electronic part inserted into the structure is composed of a single PCB or a plurality of PCBs, and should be adhered to the structure or be fastened by a fastening component. The lightweight lattice reinforced composite panel applied in the present invention may utilize both an equilateral triangle or a square or an equilateral triangle and a rectangular lattice form and an easily changeable lattice form.

The present invention relates to a grid-reinforced composite structural panel used as a space structure, a grating frame 10 formed by coupling a plurality of gratings 11, and a face member 20 bonded to one surface of the grating frame 10; And at least one electronic PCB 30 provided in the lattice space 21 formed by the lattice frame 10 and the face member 20 to perform an electronic function; and provided in the electronic PCB 30. A connector 40 for power distribution and data transfer to the outside; And electrical wiring 50 for electrical data transfer and power distribution between the electronic PCB 30.

Here, the radiation shielding plate 60 is inserted into the bottom of the grid space 21 to protect the electronic components such as the electronic PCB 30 from the space radiation environment; characterized in that it further comprises.

In addition, in the space environment to protect the electronic PCB 30 from external shocks, and shielding cover 70 for shielding the electronic interference; characterized in that it further comprises.

In addition, the lattice frame 10 is characterized in that the lattice 11 is repeatedly arranged while forming an equilateral triangle structure.

In addition, the grid frame 10 is characterized in that the grid 11 is repeatedly arranged while forming a rectangular structure.

In addition, the lattice frame 10 is characterized in that the lattice 11 is repeatedly arranged while forming an equilateral triangle structure and a square structure.

In addition, a part of the plurality of gratings 11 is removed to form a grating space 21 having a specific shape.

In addition, in order to easily assemble and connect the multifunctional structure with the skeleton structure 1 of the space structure, the grid 11 and the face member provided in the grid space 21 of the edge of the multifunctional structure and provided at the edge of the multifunctional structure. The doubler 80 of the metal or carbon fiber reinforced composite material adhered to (20); characterized in that it further comprises.

In addition, the grid frame 10 and the face member 20 is characterized in that composed of carbon fiber reinforced plastic (CFRP) material.

In addition, the grating frame 10 and the face plate 20 is characterized in that composed of a pitch-based carbon fiber reinforced composite material having a large thermal conductivity to dissipate heat generated by the electronic PCB (30).

In addition, the radiation shielding plate 60 or the shielding cover 70 is characterized in that the carbon fiber reinforced composite material prepreg and the metal thin film is composed of a multi-layer combination material.

Utilizing the present invention, the space satellite structure is to be equipped with electronic functions, thermal control function, radiation shielding function, and electronic period shielding function in the grid reinforced composite structural panel beyond the simple structural function of the original load supporting and equipment protection. By enhancing the function, it is possible to maximize the weight saving and space utilization. Existing satellite design method, the electronic box is equipped with an electronic PCB assembly to the satellite structure, connecting the complex electrical wiring, the thermal control to each electronic box independently, but the present invention is to perform the electronic function By inserting the electronic PCB and electrical wiring into the lattice-reinforced composite panel, and by implementing the heat transfer function, electron interference and radiation shielding function in the structure, the structure is configured to provide a variety of functions. By applying the present invention to a satellite structure, miniaturization and weight reduction of the satellite body can be realized, and the launch cost can be reduced.

1 is a perspective view showing a multifunctional structure according to the present invention;

2 to 5 show various embodiments of the grating frame used in the multifunctional structure according to the present invention,

6 is a perspective view illustrating an example in which the multifunctional structure according to the present invention is combined with a skeleton structure of a space structure;

7 is a perspective view showing an example in which a doubler is coupled to a multifunctional structure according to the present invention;

8 is a plan view (a) showing a shape in which the doubler is coupled to the multifunctional structure according to the present invention and A-A cross-sectional view (b) of the plan view,

9 is a perspective view showing a shape in which the radiation shielding plate is coupled to the multifunctional structure according to the present invention;

10 is a cross-sectional view of the electronic PCB is mounted on the multifunctional structure according to the present invention;

11 is a perspective view of the electrical wiring connection between the electronic PCB in the multifunctional structure according to the present invention,

12 is a perspective view of a state in which the electromagnetic interference shielding cover is mounted on the multifunctional structure according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in this specification and claims should not be construed in a common or dictionary sense, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. Based on the principle that it can, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

1 is a perspective view showing a multifunctional structure according to the present invention. As shown in FIG. 1, the present invention relates to a flat panel 100 used as a space structure, and includes an electronic PCB 30 in a grid space 21 in a lightweight composite structure 100 reinforced with a grid frame 10. ), And the electrical wiring 50 of the power distribution and data transfer functions is provided. In order to shield the electromagnetic interference (EMI) of the electronic unit, the shielding cover 70 may be additionally mounted. In order to effectively dissipate heat generated in the electronic unit, a composite material having a high thermal conductivity may be disposed on the face member 20 of the structure panel. Double panels (80) for mechanical connection are attached to the structural panels to facilitate the installation of structural panels equipped with electronic and heat transfer functions, as well as radiation shielding and electromagnetic interference shielding functions on the satellites. The grid-reinforced composite structure panel, which is a multifunctional structure of the present invention, can be used as a part of a satellite body, and is equipped with an electronic function, a heat transfer function, a radiation shielding function, and an electronic interference shielding function, so that the structure has various functions and reduces weight. In addition, the efficiency of the structure is maximized by greatly improving the space utilization.

That is, the present invention basically comprises a grating frame 10, the face plate 20, the electronic PCB 30, the connector 40 and the electrical wiring 50, the radiation shielding plate 60, the shield cover 70, it is possible to further include a doubler (80).

The lattice frame 10 is a lattice reinforcement frame formed by combining a plurality of grids 11 and has a rigidity and good load support, but may be lightly configured. The grating frame 10 is used as a grating reinforced structural panel as a basic structure for supporting loads and protecting electronic equipment together with a facesheet 20 to be described below.

The facesheet 20 is bonded to one surface of the grating frame 10 and used together with the grating frame 10 as a grating reinforced structural panel as a basic structure for supporting loads and protecting electronic equipment.

The grid frame 10 and the face plate 20 is made of a lightweight carbon fiber reinforced plastic (CFRP), not only has a lightweight property, but also has an excellent rigidity and strength due to the reinforced grid structure. In order to secure excellent thermal conductivity properties, a pitch-based carbon fiber reinforced composite material (CFRP) having a very high thermal conductivity may be applied to the grating 11 and the face plate 20. In addition, instead of applying an expensive pitch-based CFRP, a grid-reinforced composite structural panel is manufactured by applying a pan-based CFRP to the grating 11 and the face plate 20, and then pitch is promoted for the purpose of promoting thermal conductivity. A series CFRP can be added to the faceplate.

2 to 5 show various embodiments of the grating frame used in the multifunctional structure according to the present invention. FIG. 2 illustrates that the grating 11 is repeatedly arranged while forming an equilateral triangle structure, and FIG. 3 illustrates that the grating 11 is repeatedly arranged while forming a rectangular structure, and FIG. 4 illustrates the grating ( 11 shows repeated arrangement while forming an equilateral triangle structure and a square structure. In addition, FIG. 5 illustrates that a part of the plurality of gratings 11 is removed to form a grating space 21 having a specific shape.

As shown in FIG. 2, an isotropic lattice of equilateral triangle structure in which the lattice 11 is disposed in the 60 °, 0 °, and −60 ° directions may be used in the lattice reinforced composite structure panel. However, in view of the fact that a panel used in general is a quadrangular shape, when the regular triangular structure is repeatedly arranged, the triangular structure, not the equilateral triangle, may be disposed on the edge of the panel.

As shown in FIG. 3, a grid frame having a rectangular structure in which the grid 11 is disposed in 0 ° and 90 ° directions may be used in the grid reinforced composite structure panel. In this case, in consideration of the fact that a commonly used panel has a rectangular shape, the overall rectangular shape structure is repeatedly arranged.

As shown in FIG. 4, an isotropic lattice of an equilateral triangle structure and a lattice of a rectangular structure may be mixed and used in a lattice reinforced composite structure panel. In this case, as shown in FIG. 2, a triangular structure other than an equilateral triangle may be disposed at a portion where the edge portion or the equilateral triangle structure of the panel is adjacent to the rectangular structure.

2 to 4, the grating space 21 according to the shape of each grating 11 is formed. Therefore, a grid space of triangles other than an equilateral triangle, a square, or an equilateral triangle is formed. Since the electric PCB 30 mounted in the grid space may have various shapes, the shapes shown in FIGS. Part of the grid 11 was removed from the grid frame shape to secure a grid space having a specific shape.

That is, as shown in FIG. 5, the grid reinforced composite structure panel may be configured by removing some of the grids in order to secure the grid space 21 having a useful size and shape. However, this is only an example and the present invention is not limited thereto. In addition to the lattice shape shown in FIGS. 2 to 5, the lattice configuration may be modified by an easy design so that the insertion and embedding of the electronic PCB may be desired according to the shape or size of the electronic PCB. have.

In addition, the present invention, as shown in Figures 2 to 5, the lattice-reinforced composite material by the geometrical dimensions of the lattice structure, such as the thickness (t), height (h) of the grid, the spacing between adjacent grids (d, d1, d2) The stiffness and strength of the structural panels can vary, and each geometric dimension can be adjusted during manufacturing to ensure that the desired stiffness and strength are achieved. In addition, the thickness of the face material also depends on the thickness of the carbon fiber reinforced composite material laminated, it is possible to adjust the stacking direction and thickness to obtain sufficient rigidity and strength.

The present invention is a multi-functional structure 100 to which the grid reinforced composite structure panel is applied, as shown in Figure 6, the structure of the satellite is directly coupled to the frame of the satellite (frame), that is, the skeleton structure (1) of the space structure Can serve as a panel. Armature fastening bolts (bolts) 2 are used to mount the grid reinforced structural panels to the satellite armature 1. The sleeve bushing 3 guides the correct position of the fastening bolts and prevents the bolt heads from damaging the face material surface during fastening.

Here, when fastening the lattice-reinforced structural panel to the skeleton frame 1 of the satellite, it is difficult to support the fastening force of the bolt 2 only with the face plate 20, so as to strengthen the mechanical fastening support strength as shown in FIG. For the purpose, a doubler 80 made of metal or CFRP material is additionally mounted to the grid reinforced composite structural panel. The doubler 80 is bonded to the interface between the lattice 11 and the face member 20 using an adhesive when manufacturing the lattice-reinforced composite structural panel, and serves to reinforce the fastening support strength.

8 is a plan view (a) and AA cross-sectional view (b) showing a shape in which a doubler is coupled to a multifunctional structure according to the present invention, in which a doubler 80, a face plate 20, and a sleeve bushing 3 are combined; The cross section of the shape is shown. As can be seen from the doubler 80 is to supplement the thickness of the thin face 20, the multifunctional structure 100 of the present invention facilitates the bolt coupling to the skeleton structure (1) of the space structure. The sleeve bushing 3 also supplements the bolted connection.

In addition, the present invention, as shown in Figure 1, is utilized for the purpose of attaching or mounting a plurality of electronic PCB 30 in the grating space 21 formed between adjacent gratings. 9 is a perspective view showing a shape in which the radiation shielding plate is coupled to the multifunctional structure according to the present invention.

As shown in FIG. 9, in order to protect electronic components mounted with the electronic PCB 30 from the space radiation environment, radiation made of metal or CFRP material in the bottom region of the grid space 21 to which the electronic PCB 30 is attached or mounted. The shielding plate 60 is bonded. The thickness of the radiation shield plate 60 is adjusted to obtain a sufficient radiation shielding effect, the light density shield plate is made by placing a dense metal and a lightweight CFRP material in a thin film multilayer, the grid space to be mounted electronic PCB Attach to the bottom of 21.

In addition, in the present invention, as shown in FIG. 1, a single number of electronic PCBs 30 may be attached to the lattice space 21. 10 is a cross-sectional view of the electronic PCB is mounted on the multifunctional structure according to the present invention.

As shown in FIG. 10, a plurality of electronic PCBs 30 may be installed in the same lattice space 21 while maintaining a predetermined interval using the spacers 22. The use of spacers is very useful when mounting electronic components on both sides of the electronic PCB 30 to increase the mounting density or stacking a plurality of electronic PCBs 30. Of course, even if the spacer 22 is provided with only one electronic PCB 30 in one lattice space 21, both ends of the electronic PCB 30 so that the electronic PCB 30 does not contact the floor. It can also be used as a stand.

Further, the present invention as shown in detail in Figures 1 and 11, the electrical data transfer and power distribution between the electronic PCB 30 is made through the electrical wiring (50, harness), for connecting the electrical wiring generated in the grid Slot 12 guides the path of electrical wiring 50. Data transmission and power distribution between the electronic PCB 30 and the outside are made through a connector 40.

As shown in FIG. 1, the present invention includes a cover 70 for shielding the electronic PCB 30 from external impact and shielding the electromagnetic interference. The cover fastening bolt 71 and the screw fastening cover nut 13 attached to the lattice 11 are used when the cover 70 is attached. The shielding cover 70 is composed of a metal thin film and a lightweight CFRP material, and can be manufactured by arranging them in multiple layers.

In addition, the present invention, as shown in Figure 12, the grid reinforced composite panel fastening the electromagnetic interference shield cover 70 includes an electronic PCB (30) therein, the radiation shielding function and heat transfer function and electromagnetic It acts as a multi-functional structure with a shielding function, and itself is assembled to a satellite to function as a satellite structural panel.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Claims

A grid reinforced composite structural panel used as a space structure,

A grid frame 10 formed by combining a plurality of grids 11;

A face member 20 bonded to one surface of the lattice frame 10;

One or more electronic PCBs 30 provided in the lattice space 21 formed by the lattice frame 10 and the face member 20 to perform electronic functions;

A connector 40 provided in the electronic PCB 30 for power distribution and data transfer to the outside; And

And electrical wiring (50) for electrical data transfer and power distribution between the electronic PCB (30).
The method of claim 1,

Multifunctional structure further comprising; radiation shielding plate (60) is inserted into the bottom of the grid space 21 to protect electronic components such as electronic PCB (30) from the space radiation environment.
The method of claim 1,

Multifunctional structure, further comprising; shielding cover (70) for protecting the electronic PCB (30) from external impact in the space environment, shielding the electronic interference.
The method of claim 1, wherein the grid frame 10,

Multifunctional structure, characterized in that the lattice (11) is repeatedly arranged while forming an equilateral triangle structure.
The method of claim 1, wherein the grid frame 10,

Multifunctional structure, characterized in that the lattice (11) is repeatedly arranged while forming a rectangular structure.
The method of claim 1, wherein the grid frame 10,

Multifunctional structure, characterized in that the lattice (11) is repeatedly arranged while forming an equilateral triangle structure and a rectangular structure.
The method according to any one of claims 4 to 6,

A multi-functional structure, characterized in that a portion of the plurality of grids (11) is removed to form a grid space (21) of a specific shape.
The method of claim 1,

In order to easily assemble and connect the multi-functional structure with the skeleton structure 1 of the space structure, the grating 11 and the face member 20 provided in the lattice space 21 at the edge of the multi-functional structure are provided at the edge of the multi-functional structure. Multi-functional structure further comprising ;; doubler (80) of the metal or carbon fiber reinforced composite material bonded to.
The method of claim 1,

The grid frame 10 and the face member 20 is a multifunctional structure, characterized in that composed of carbon fiber reinforced plastic (CFRP) material.
The method of claim 9,

The grid frame (10) and the face plate (20) is a multifunctional structure, characterized in that composed of a pitch-based carbon fiber reinforced composite material having a large thermal conductivity coefficient to dissipate heat generated by the electronic PCB (30).
The method according to claim 2 or 3,

The radiation shielding plate (60) or the shielding cover (70) is a multifunctional structure, characterized in that the carbon fiber reinforced composite material prepreg and the metal thin film is composed of a multi-layer combination material.