阅读说明：本技术 可展格栅支撑折叠肋式天线反射器 (Expandable grid supported folding rib type antenna reflector ) 是由 王晓凯 梁宝柱 程庆清 周鑫 陈晓峰 李向华 施飞舟 刘天明 于 2019-11-29 设计创作，主要内容包括：本发明公开了可展格栅支撑折叠肋式天线反射器,包括天线反射器底座、固体反射面、内层折叠肋、外层折叠肋、肋间转动关节、可折展支撑格栅以及柔性反射面,底座连接的中心区域为高精度固体反射面,底座边缘连接的为径向展开格栅支撑反射面,可展部件包括内外层多个折叠肋,折叠肋通过内层折叠肋根部与底座边缘的铰链以及折叠肋之间的转动关节实现天线机构的多级展开,折叠肋周向肋间连接可折展支撑格栅,柔性反射面铺设在折叠肋和格栅之上,可展格栅编织成可折展的菱形形状,折叠肋及格栅支撑反射面端按理想曲面或曲线加工,消除原理误差,柔性反射面张拉在菱形及折叠肋支撑结构上,实现反射面成形,适应于星载大型载荷天线反射器。(The invention discloses an expandable grid support folding rib type antenna reflector, which comprises an antenna reflector base, a solid reflecting surface, an inner layer folding rib, an outer layer folding rib, a rotary joint between ribs, a foldable support grid and a flexible reflecting surface, wherein the central area connected with the base is a high-precision solid reflecting surface, the edge of the base is connected with a radial expansion grid support reflecting surface, an expandable part comprises an inner layer and an outer layer of a plurality of folding ribs, the folding ribs realize the multi-stage expansion of an antenna mechanism through hinges at the root parts of the inner layer folding ribs and the edge of the base and the rotary joints among the folding ribs, the foldable support grid is connected among the circumferential ribs of the folding ribs, the flexible reflecting surface is laid on the folding ribs and the grid, the expandable grid is woven into a foldable diamond shape, the ends of the folding ribs and the grid support reflecting surface are processed according to an ideal curved surface or curve to eliminate principle errors, and the flexible reflecting surface is stretched on a diamond and folding rib, the reflector realizes the shaping of the reflecting surface and is suitable for a satellite-borne large-scale load antenna reflector.)

1. An expandable grid-supported folded rib antenna reflector comprising: the antenna reflector comprises an antenna reflector base, a solid reflecting surface, an inner layer folding rib, an outer layer folding rib, an intercostal rotating joint, a foldable support grid and a flexible reflecting surface;

the antenna reflector base is a hollow cavity structure, one surface of the base is fixed on the antenna bracket, and the other surface of the base is connected with the solid reflecting surface;

the expandable part comprises a plurality of folded ribs on the inner layer and the outer layer, the cross section of the root part of each expanded rib close to the base of the antenna reflector is larger than the cross section of the far end far away from the base of the antenna reflector, the root part of each folded rib on the inner layer is connected with the edge of the base through a hinge, and each pair of folded ribs on the inner layer and the outer layer are connected through a rotary joint between the ribs; foldable support grids are connected among the circumferential ribs of the folding ribs and play a role in supporting the folding ribs and the flexible reflecting surface;

the flexible reflective surface is laid over the folded ribs and the grid to form a specific curved surface.

2. The deployable grid-supported folded rib antenna reflector of claim 1, wherein the solid reflective surface is a high-precision reflective surface for use in the uhf electromagnetic band of the central region.

3. The deployable grid-supported folded rib antenna reflector of claim 1, wherein the upper surface of the folded rib is a long narrow curved surface that is the theoretical curved surface of the reflector in the area corresponding to the curved surface.

4. The deployable grid-supported folded rib antenna reflector of claim 1, wherein the folded ribs are configured to be folded and unfolded in two folds, and the inner and outer ribs are connected by an intercostal rotary joint and are deployed by a driving mechanism to expand the aperture of the reflecting surface.

5. The deployable grid-supported folded rib antenna reflector of claim 3 or 4, wherein the folded ribs are of hollow carbon honeycomb sandwich composite structure.

6. The deployable grid-supported folded rib antenna reflector of claim 1, wherein the deployable support grid is a thin-shelled grid structure, and the grid is woven to form a diamond-shaped compressible and expandable collapsible form.

7. The deployable grid-supported folded rib antenna reflector of claim 6, wherein the upper end of the deployable support grid has a curve corresponding to a theoretical curve of the grid projected onto the curved surface of the reflector.

8. The deployable grid-supported folded rib antenna reflector of claim 1, wherein the flexible reflective surface is a single layer of flexible metal mesh or film-like material, and the flexible reflective surface has a tension, and the flexible reflective surface is shaped to approximate a theoretical reflective surface by the curved surface of the folded rib, the curved grid line and tension.

Technical Field

The invention relates to an antenna reflector, in particular to an expandable grid support folding rib type antenna reflector which is applied to a large-scale high-precision rib type antenna reflector in space.

Background

With the rapid development of satellite payload technology, spacecrafts such as microwave remote sensing satellites, mobile communication satellites, data relay satellites and electronic reconnaissance satellites all put requirements on larger size and higher radio wave frequency on satellite-borne antennas. In order to obtain signals of ground micro transmitting power, improve information transmission capacity and realize high resolution of remote sensing, the satellite-borne antenna develops towards the direction of large-caliber and high-profile precision. Due to the limitation of carrying capacity, the development and light weight of the antenna are the development trend, and the radial rib type deployable antenna is one of the very potential structural forms.

In the existing various radial rib antenna reflectors applied to space, the calibers of the radial rib antenna reflectors are mostly within 10 meters, and large deployable radial rib antenna reflectors with the calibers of more than 10 meters are not available. Aiming at large-caliber high-precision radial rib antenna reflectors with the diameters of 10 meters, 20 meters and more than 30 meters, at least the following problems exist if the current structural form of the radial rib antenna is adopted:

1. increasing the length of the unfolding rib to adapt to the caliber change of the antenna reflector, so that the folded envelope of the antenna exceeds the carrying envelope limit;

2. after the aperture of the antenna is increased, the difficulty in forming and adjusting the reflecting surface of the double-layer cable net structure is increased, and the workload is increased in geometric multiples;

3. in a severe space environment, a cable net material of the antenna reflecting surface is easy to creep and loose, so that the profile of the antenna reflecting surface is easy to change, the stability of a profile system is not high, and the profile system does not have high profile precision and profile holding capacity;

4. the reflector is an integral system formed by stretching the expansion ribs and the flexible cable nets, the structure is low in rigidity and easy to deform, and the performance of the antenna reflector is further influenced.

Disclosure of Invention

In order to overcome the technical defects, the invention aims to provide a large-caliber high-precision folding rib type radial expansion antenna reflector suitable for space.

The invention provides an expandable grid support folding rib type antenna reflector, which adopts a radial rib foldable and expandable structure, and adopts an expandable grid between ribs as a support structure of a flexible reflecting surface to realize large-caliber and high-precision forming of the antenna reflecting surface.

The technical scheme of the invention is as follows: an expandable grid supported folding rib type antenna reflector applied to a space comprises an antenna reflector base, a solid reflecting surface, an inner layer folding rib, an outer layer folding rib, an intercostal rotating joint, a foldable support grid and a flexible reflecting surface, wherein the antenna reflector base is of a hollow cavity structure, one surface of the base is fixed on an antenna bracket (not shown), and the other surface of the base is connected with the solid reflecting surface; the expandable part comprises a plurality of folded ribs on the inner layer and the outer layer, the cross section of the root part of each expanded rib close to the base of the antenna reflector is larger than the cross section of the far end far away from the base of the antenna reflector, the root part of each folded rib on the inner layer is connected with the edge of the base through a hinge, and each pair of folded ribs on the inner layer and the outer layer are connected through a rotary joint between the ribs; foldable support grids are connected among the circumferential ribs of the folding ribs and play a role in supporting the folding ribs and the flexible reflecting surface; the flexible reflective surface is laid over the folded ribs and the grid to form a specific curved surface.

Preferably, the solid reflecting surface is a high-precision reflecting surface and is used for the ultrahigh frequency electromagnetic band in the central area.

Preferably, the upper surface of the folded rib is a long and narrow curved surface, and the curved surface is a theoretical curved surface of the reflector in the corresponding area.

Preferably, the folding ribs are designed into a two-fold foldable form, the inner layer ribs and the outer layer ribs are connected through the rotary joints between the ribs and are unfolded by applying a driving mechanism, and the folding ribs are used for expanding the caliber of the reflecting surface.

Preferably, the folding ribs are of a hollow carbon honeycomb sandwich composite structure.

Preferably, the foldable support grid is of a thin-shell grid structure, and the grid is woven to form a diamond-shaped foldable form capable of being compressed and expanded.

Preferably, the upper end of the foldable support grid is a specific curve, and the curve is a theoretical curve corresponding to the projection of the grid on the curved surface of the reflector.

Preferably, the flexible reflecting surface is a single-layer flexible metal mesh or a film material, the flexible reflecting surface is laid on the folding ribs and the support grids and has certain tension, and the flexible reflecting surface is formed by stretching the curved surfaces of the folding ribs, the grid curves and the certain tension and approaches to a theoretical reflecting curved surface.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adopts a radial rib foldable and expandable structure, and expandable grids are applied among ribs as a supporting structure of the flexible reflecting surface, so that the large-scale of the caliber of the radial rib type antenna reflector is easy to realize.

2. The foldable support grid is designed into a foldable form to fill the circumferential space of adjacent radial folding ribs, so that the rigidity of the overall structure in an unfolded state is improved.

3. The end faces of the support ends of the foldable support grids and the foldable ribs are processed into corresponding theoretical curves or curved surfaces, so that the precision of the reflecting surface is improved.

4. The flexible reflecting surface is a single-layer reflecting surface, the unfolding molded surface depends on the molded surface precision formed by the foldable supporting grids and the foldable ribs, and compared with a mesh antenna reflecting surface, the flexible reflecting surface does not need excessive precision adjustment, is higher in unfolding precision, does not have risks such as hooking and the like, and has higher unfolding reliability.

Drawings

Fig. 1 is a schematic view of an embodiment of an expandable grid-supported folded rib antenna reflector in an expanded state;

fig. 2 is a schematic diagram of a foldable grid-supported folded rib antenna reflector according to an embodiment of the present invention in a folded state;

fig. 3 is a foldable inter-rib support grid for an expandable grid support folded rib antenna reflector according to an embodiment of the present invention.

Detailed Description

The invention will be further elucidated with reference to specific embodiments and with reference to the drawing. The labels in the figure are: 1-an antenna reflector base; 2-a solid reflective surface; 3-inner layer folding ribs; 4-outer layer folding ribs; 5-intercostal revolute joints; 6-foldable support grids (6-1: inner layer foldable support grids and 6-2: outer layer foldable support grids); 7-flexible reflective surface.

The expandable grid support folding rib type antenna reflector disclosed by the invention, referring to fig. 1 and in combination with fig. 2, comprises an antenna reflector base 1, a solid reflecting surface 2, an inner layer folding rib 3, an outer layer folding rib 4, an intercostal rotating joint 5, an expandable support grid 6 and a flexible reflecting surface 7. One side of the antenna reflector base 1 is fixed on the antenna bracket to play a role in fixing the antenna reflector, and the other end of the reflector base is connected with the solid reflecting surface 2. The extensible part comprises an inner layer folding rib 3 and an outer layer folding rib 4, the number of the folding ribs can be specifically set according to actual conditions, the cross section of the root part of each folding rib close to the antenna reflector base is larger than that of the far end far away from the antenna reflector base, the root part of the inner layer folding rib 3 is connected with the edge of the reflector base 1 through a hinge, and the inner layer folding rib 3 can be extended around the position where the root part is connected with the edge of the reflector base through the hinge; the outer layer folding ribs 4 are connected with the inner layer folding ribs 3 through intercostal rotating joints 5, and the outer layer folding ribs are unfolded outwards around the rotating joints to expand the unfolding caliber of the antenna reflector. The adjacent folding ribs are connected through a foldable support grid 6, as shown in fig. 3, the foldable support grid 6 is designed into a diamond-shaped foldable form capable of being compressed and expanded, the upper end of the foldable support grid is processed into a specific curve, the curve is a theoretical curve corresponding to the projection of the grid on the curved surface of the reflector, the flexible reflecting surface 7 is of a single-layer metal mesh or film structure and is stretched on the surface of the foldable support grid 6, and a final curved surface of the reflecting surface is formed according to the shape of the grid. The folding rib antenna reflector with the extensible grating supporting reflecting surface has high precision of a fixed surface, and compared with the traditional radial rib antenna, the extensible rib antenna reflector with the extensible aperture has the extensible performance; compared with the existing large-scale double-layer mesh antenna, the folding rib antenna reflector with the extensible grating supporting reflecting surface does not need a large amount of cable net precision adjustment process, greatly reduces the construction period of reflecting surface precision forming, connects the extensible supporting grating among ribs and processes the extensible supporting grating into a theoretical curve corresponding to the reflecting surface, not only improves the rigidity of the antenna reflector, but also greatly reduces the principle error of the reflecting surface, has the high precision forming and profile holding capacity of the reflecting surface, and greatly improves the performance of the antenna reflector.

Furthermore, the solid reflecting surface 2 is fixed at the upper end of the reflector base and is positioned in the center of the reflector, the solid reflecting surface is of a composite material structure, and high-precision forming of the reflecting surface is achieved through a grinding tool so as to meet the use requirement of the ultrahigh-frequency electromagnetic wave band of the reflecting surface.

Furthermore, the upper surfaces of the inner layer folding ribs 3 and the outer layer folding ribs 4 are long and narrow curved surfaces which are theoretical curved surfaces of reflectors in corresponding areas, the folding ribs are of hollow carbon honeycomb sandwich composite material structures, the inner layer ribs and the outer layer ribs are connected through the rotating joints 5 between the ribs and are unfolded by applying a driving mechanism, and the opening diameter of the reflecting surface is expanded.

Furthermore, the foldable and unfoldable support grating 6 is woven to form a rhombic compressible and expandable foldable form, the grating is of a thin-shell composite material structure, the foldable and unfoldable support grating is in a spaced form between the inner layer folding ribs and the outer layer folding ribs, so that the inner layer grating and the outer layer grating are separated, the phenomenon of geometric interference cannot occur in the folding and unfolding processes of the inner layer folding ribs and the outer layer folding ribs, the support ends of the foldable and unfoldable grating are processed according to curves corresponding to the projections of the support ends on the curved surface of the reflector, after the foldable and unfoldable rhombic shape is woven, four sides of the rhombus fall on a theoretical reflection curved surface, and the flexible reflection surface is stretched on the rhombic support structure, so.

Furthermore, the flexible reflecting surface 7 is a single-layer flexible metal net or film material, the flexible reflecting surface is laid on the folding ribs and the support grids and has certain tension, the flexible reflecting surface is formed by stretching the curved surfaces of the folding ribs, the grid curves and the certain tension, and compared with a double-layer cable net reflecting surface, the reflector adopting the design does not need a large amount of cable net precision adjustment processes, and the workload of forming and adjusting the reflecting surface precision is greatly reduced.