阅读说明：本技术 一种用于航天着陆器足垫的轻质高强仿圆筛藻多层级支撑结构 (Light high-strength round-sieve-imitating algae multi-level supporting structure for foot pad of spaceflight lander ) 是由 顾冬冬 孙建峰 林开杰 王骞 宋玉越 于 2021-07-29 设计创作，主要内容包括：本发明公开一种用于航天着陆器足垫的轻质高强仿圆筛藻多层级支撑结构,包括一级结构、二级结构和三级结构；所述一级结构包括一个内轮圈、一个外轮圈及数根沿内轮圈的圆周径向延伸的轮条；所述二级结构包括多根长度不一的横条,平行排列在一级结构中相邻的轮条构成的扇形结构中；所述三级结构填充在一级结构和二级结构之间。本发明是根据仿生学原理,并基于圆筛藻硅质截头体结构特征设计成一种新型着陆器足垫支撑结构,由于仿圆筛藻的支撑结构具有特殊的分布和排列,当结构与陆地接触时,受到冲击荷载的作用,在多级支撑结构的作用下,有效缓解了应力集中,合理分布了冲击过程中产生的能力,提高了结构的抗冲击性能。(The invention discloses a light high-strength round sieve-imitating algae multi-level supporting structure for a foot pad of an aerospace lander, which comprises a primary structure, a secondary structure and a tertiary structure; the primary structure comprises an inner wheel ring, an outer wheel ring and a plurality of wheel strips extending along the circumference of the inner wheel ring in the radial direction; the secondary structure comprises a plurality of transverse strips with different lengths, and the transverse strips are arranged in parallel in a fan-shaped structure formed by adjacent spokes in the primary structure; the tertiary structure is filled between the primary structure and the secondary structure. The invention designs a novel lander foot pad supporting structure based on the structural characteristics of the siliceous frustum of the round sieve algae according to the bionics principle, because the supporting structure of the round sieve algae has special distribution and arrangement, when the structure is contacted with the land, the structure is under the action of impact load, under the action of a multi-stage supporting structure, the stress concentration is effectively relieved, the capacity generated in the impact process is reasonably distributed, and the impact resistance of the structure is improved.)

1. A light high-strength round sieve-imitating algae multi-level supporting structure for a foot pad of an aerospace lander is characterized by consisting of a multi-level structure, wherein the multi-level structure comprises a primary structure, a secondary structure and a tertiary structure;

the primary structure comprises an inner wheel ring (1), an outer wheel ring (3) and a plurality of wheel bars (2) which radially extend along the circumference of the inner wheel ring (1); the inner ring (1) and the outer ring (3) are coaxially arranged; one end of any one of the wheel strips (2) is connected with the inner wheel ring (1), and the other end is connected with the outer wheel ring (3); the spoke (2) is integrally formed with the inner wheel ring (1) and the outer wheel ring (3);

the secondary structure comprises a plurality of transverse strips (4) with different lengths, the transverse strips (4) are arranged in parallel in a fan-shaped structure formed by adjacent spokes (2) in the primary structure, and included angles formed by the transverse strips (4) and the spokes (2) are equal;

the tertiary structure is filled between the primary structure and the secondary structure.

2. The lightweight high-strength cyclocarya paliurus multi-level support structure for the foot pad of the aerospace lander according to claim 1, wherein the primary structure, the secondary structure and the tertiary structure are integrally formed.

3. The multi-stage supporting structure of light-weight high-strength cyclocarya paliurus for the foot pad of the aerospace lander is characterized in that the radius of the inner wheel ring (1) is 25mm, and the height of the inner wheel ring is 20 mm.

4. The light-weight high-strength round sieve algae multilayer supporting structure for the foot pad of the aerospace lander is characterized in that the width of the wheel strip (2) is in gradient change in the radius direction, the height of the wheel strip is in nonlinear gradient change along with the radian of the foot pad, the width and the height of the wheel strip are gradually reduced from one end connected with the inner ring (1) to one end connected with the outer ring (3), the width change range is 2.5 mm-4 mm, the height change range is 5-20 mm, and the length of the wheel strip (2) is 100 mm.

5. The multi-layer supporting structure of the light-weight high-strength cyclocarya paliurus for the foot pad of the aerospace lander is characterized in that the radius of the outer wheel ring (4) is the sum of the radius of the inner wheel ring (1) and the length of the wheel strip (2), and the height of the multi-layer supporting structure is 5 mm.

6. The multi-stage supporting structure of light-weight high-strength cyclocarya paliurus for the foot pad of the aerospace lander is characterized in that the number of the wheel bars (2) is 6, 8 or 12; the angles between the adjacent spokes (2) are equal.

7. The multi-stage supporting structure of light-weight high-strength cyclocarya paliurus for the foot pad of the aerospace lander is characterized in that the width of the transverse bars (4) is 2.5mm, the height of the transverse bars is 7.5mm, and the distance between every two transverse bars (4) is 20 mm.

8. The lightweight, high strength, cyclocarya paliurus multi-stage support structure for the footpad of an aerospace lander as claimed in claim 1, wherein the tertiary structure comprises a honeycomb structure.

9. The lightweight high-strength roundish screen multi-layer support structure for the foot pad of the aerospace lander according to claim 8, wherein the side length of the honeycomb is 2.5 mm.

10. The light-weight high-strength synechocystis multi-level support structure for the foot pad of the aerospace lander according to claim 1, wherein the material of the primary structure, the secondary structure and the tertiary structure is AlSi10 Mg.

Technical Field

The invention relates to the technical field of bionic structure engineering, in particular to a light high-strength round sieve-imitating algae multi-level supporting structure for a foot pad of a spacecraft.

Background

The moon has abundant mineral resources, is an important transfer station for human marching deep space, and is also the most important natural space experimental base. Therefore, the development of lunar exploration is of great significance to human development. In the whole lunar exploration process, the safe and stable lunar landing of the landing probe is one of the main tasks to be completed. In the soft landing process, the foot pad is a lander part which is in direct impact contact with lunar soil, and whether the foot pad can bear impact load well and keep the stability of the landing detector is directly related to whether equipment can normally operate and the implementation of subsequent detection work. However, most of the lander foot pads applied at present are thick metal disc-shaped foot pads, so that the manufacturing cost is increased, the energy consumption in the landing and return process is increased, and the movement radius of the detector is limited to a certain extent. Therefore, on the premise of maintaining the mechanical property, the development of the lightweight design research of the lander foot pad has great significance.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a light-weight high-strength round sieve-imitating algae multi-layer supporting structure for a foot pad of an aerospace lander, which replaces the traditional thick and heavy metal disc foot pad and simultaneously keeps the requirements on the mechanical property and the stability of the foot pad.

The technical scheme is as follows: a light-weight high-strength round sieve-imitating algae multi-level supporting structure for a foot pad of an aerospace lander is composed of a multi-level structure, wherein the multi-level structure comprises a primary structure, a secondary structure and a tertiary structure;

the primary structure comprises an inner wheel ring, an outer wheel ring and a plurality of wheel strips extending along the circumference of the inner wheel ring in the radial direction; the inner ring and the outer ring are coaxially arranged; one end of each spoke is connected with the inner wheel ring, and the other end of each spoke is connected with the outer wheel ring; the wheel strip, the inner wheel ring and the outer wheel ring are integrally formed;

the secondary structure comprises a plurality of transverse strips with different lengths, the transverse strips are arranged in parallel in a fan-shaped structure formed by adjacent spokes in the primary structure, and included angles formed by the transverse strips and the spokes are equal; the secondary structure is the primary reinforcement that enhances the load bearing capacity of the footpad;

the tertiary structure is filled between the primary structure and the secondary structure. The three-stage structure covers the whole structure and is a main structure for improving landing stability and absorbing energy.

Further, the primary structure, the secondary structure and the tertiary structure are integrally formed.

Further, the radius of inner wheel circle is 25mm, and the height is 20 mm.

Furthermore, the width of the spoke is in gradient change in the radius direction, the height of the spoke is in nonlinear gradient change along with the radian of the foot pad, the width and the height of the spoke are gradually reduced from one end connected with the inner wheel ring to one end connected with the outer wheel ring, the width change range is 2.5 mm-4 mm, the height change range is 5 mm-20 mm, and the length of the spoke is 100 mm.

Furthermore, the radius of the outer wheel ring is the sum of the radius of the inner wheel ring and the length of the wheel strip, and the height of the outer wheel ring is 5 mm.

Further, the number of the spokes is 6, 8 or 12; the angles between adjacent spokes are equal.

Further, the width of horizontal bar is 2.5mm, and high 7.5mm, the distance between each horizontal bar is 20 mm.

Further, the tertiary structure includes a honeycomb structure.

Further, the side length of the honeycomb is 2.5 mm.

Further, the material of the primary structure, the secondary structure and the tertiary structure is AlSi10 Mg.

Has the advantages that: from the perspective of bionics, the invention designs a light-weight high-strength round sieve-like algae multi-layer supporting structure for a foot pad of an aerospace lander by simulating the structural characteristics of a siliceous frustum of the round sieve-like algae, and finite element simulation analysis shows that the structure has good impact resistance, and simultaneously realizes the light weight of the structure and can reduce the investment of the structure in the manufacturing and using processes.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

FIG. 3 is a schematic structural diagram according to embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram according to embodiment 4 of the present invention;

FIG. 5 is a line graph showing impact resistance of examples 1 to 4 of the present invention;

FIG. 6 is a schematic diagram of an energy absorption process according to embodiments 1-4 of the present invention;

FIG. 7 is a bar graph of energy absorption capacity of examples 1 to 4 of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the attached drawings, but the scope of the present invention is not limited to the described embodiments.

In the invention, the primary support structure is a main component of the foot pad for bearing load, absorbs most energy, and the inner rim 1 in the radiation center of the primary structure can be assembled with the lander bracket. When the foot pad is impacted, the secondary structure can effectively keep the stability of the primary structure and assist the primary structure to bear load. The tertiary structure effectively improves the structure deformability and ensures the landing stability of the foot pad. The overall structure is distributed in a staggered manner, the integrity of the overall structure is guaranteed, external force can be well resisted, stress concentration is prevented, and the overall structure has good mechanical property and usability.

Example 1: a light high-strength round sieve algae-imitating multi-level supporting structure for a foot pad of an aerospace lander is composed of a primary structure, a secondary structure and a tertiary structure, wherein the radius of an inner ring 1 is 25mm, and the height of the inner ring is 20 mm; the radius of the foot pad, namely the radius of the outer wheel ring 3 is 125mm, and the height is 5 mm; the number of the spokes 2 is 12, the angle between adjacent spokes 2 is 30 degrees, the width of the spokes 2 is changed in a linear gradient manner in the radius direction, the height is changed in a nonlinear gradient manner along with the radian of the foot pad, the width and the height are gradually reduced from one end connected with the inner rim 1 to one end connected with the outer rim 3, the width change range is 2.5 mm-4 mm, the height change range is 5 mm-20 mm, and the length is 100 mm; the width of each horizontal strip 4 of the secondary structure is 2.5mm, the height of each horizontal strip is 7.5mm, the distance between every two horizontal strips is 20mm, and the side length of the tertiary honeycomb structure is 2.5 mm.

The primary structure is a main supporting structure, the secondary structure can keep the stability of the primary structure and provide secondary support, and the tertiary structure improves the stability of the whole structure.

Example 2: a light high-strength round sieve algae-imitating multi-level supporting structure for a foot pad of an aerospace lander is composed of a primary structure, a secondary structure and a tertiary structure, wherein the radius of an inner ring 1 is 25mm, and the height of the inner ring is 20 mm; the radius of the foot pad, namely the radius of the outer wheel ring 3 is 125mm, and the height is 5 mm; the number of the spokes 2 is 8, the angle between every two adjacent spokes 2 is 45 degrees, the width of each spoke 2 is changed in a linear gradient manner in the radius direction, the height is changed in a nonlinear gradient manner along with the radian of the foot pad, the width and the height are gradually reduced from one end connected with the inner rim 1 to one end connected with the outer rim 3, the width change range is 2.5 mm-4 mm, the height change range is 5 mm-20 mm, and the length is 100 mm; the width of each horizontal strip 4 of the secondary structure is 2.5mm, the height of each horizontal strip is 7.5mm, the distance between every two horizontal strips is 20mm, and the side length of the tertiary honeycomb structure is 2.5 mm.

The primary structure is a main supporting structure, the secondary structure can keep the stability of the primary structure and provide secondary support, and the tertiary structure improves the stability of the whole structure.

Example 3: a light high-strength round sieve algae-imitating multi-level supporting structure for a foot pad of an aerospace lander is composed of a primary structure, a secondary structure and a tertiary structure, wherein the radius of an inner ring 1 is 25mm, and the height of the inner ring is 20 mm; the radius of the foot pad, namely the radius of the outer wheel ring 3 is 125mm, and the height is 5 mm; the number of the spokes (2) is 6, the angle between adjacent spokes (2) is 60 degrees, the width of the spokes (2) is changed in a linear gradient manner in the radius direction, the height is changed in a nonlinear gradient manner along with the radian of a foot pad, the width and the height are gradually reduced from one end connected with the inner rim (1) to one end connected with the outer rim (3), the width change range is 2.5-4 mm, the height change range is 5-20 mm, and the length is 100 mm; the width of each horizontal strip 4 of the secondary structure is 2.5mm, the height of each horizontal strip is 7.5mm, the distance between every two horizontal strips is 20mm, and the side length of the tertiary honeycomb structure is 2.5 mm.

The primary structure is a main supporting structure, the secondary structure can keep the stability of the primary structure and provide secondary support, and the tertiary structure improves the stability of the whole structure.

Example 4: a light high-strength round sieve algae-imitating multi-level supporting structure for a foot pad of an aerospace lander is composed of a primary structure, a secondary structure and a tertiary structure, wherein the radius of an inner ring 1 is 25mm, and the height of the inner ring is 20 mm; the radius of the foot pad, namely the radius of the outer wheel ring 3 is 125mm, and the height is 5 mm; the number of the spokes 2 is 8, the angle between every two adjacent spokes 2 is 45 degrees, the width of each spoke 2 is changed in a linear gradient manner in the radius direction, the height is changed in a nonlinear gradient manner along with the radian of the foot pad, the width and the height are gradually reduced from one end connected with the inner rim 1 to one end connected with the outer rim 3, the width change range is 2.5 mm-4 mm, the height change range is 5 mm-20 mm, and the length is 100 mm; the width of the horizontal strips 4 of the secondary structure is 2.5mm, the height is 7.5mm, the distance between every two horizontal strips 4 is 20mm, and a honeycomb structure is not used, so that the tertiary structure is sealed.

The performance characterization methods for the biomimetic footpad structures of examples 1-3 are as follows:

mechanical property research is carried out on the foot pad structure of the bionic lander, mechanical property parameters of SLM forming aluminum alloy, such as Young modulus, tensile strength, elongation at break and the like, are obtained through experiments, the parameters are input into finite element analysis software LS-DYNA, then a model is led in, meshes are divided, boundaries and load conditions are added, and finally the mechanical properties of the structure, such as deformability, stress distribution, breaking bearing capacity and the like, are solved through a built-in solver.

The mechanical property of the structure is analyzed by a finite element analysis means, so that the actual property of the structure can be accurately predicted, the cost of the invention can be greatly reduced, and the efficiency of the invention can be improved.

As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.