Quasi-statically-determinate supporting structure for reflector of space remote sensor

Abstract

The invention relates to a quasi-static support structure for a reflector of a space remote sensor, and belongs to the field of support of the reflector of the space remote sensor. Comprising a reflector and three plate spring array supporting assemblies. The reflecting mirror is of a horizontally-placed plate-shaped structure. The three plate spring array supporting assemblies are arranged on the lower surface of the reflector, and the three plate spring array supporting assemblies are evenly distributed in the circumferential direction with the center of the reflector as the center. The plate spring array supporting assembly is of a cylindrical structure with a groove in the top. The axis of the plate spring array supporting assembly is arranged in the radial direction of the reflector. Or the axes of the three plate spring array supporting assemblies are perpendicular to the radial direction of the reflector, and an equilateral triangle is defined by the axes of the three plate spring array supporting assemblies; according to the invention, the plate spring group and the knuckle bearing release freedom degree constraint in a specific direction to realize quasi-static support of the reflector.

Description

Technical Field

[0001] The invention belongs to the field of space remote sensor reflector support and relates to a quasi-statically determinate support structure of a space remote sensor reflector. Background Art

[0002] Reflective optical systems are widely used in space remote sensors, in which the support of the reflector is critical to the system performance. The support of the reflector needs to ensure the surface accuracy and position accuracy of the reflector, while also considering the mechanical environment during the launch phase and the temperature fluctuations in orbit. Kinematic support based on static constraint theory is an ideal reflector support structure. The kinematic support just constrains the six degrees of freedom of the reflector. When the ambient temperature changes, the reflector undergoes a small rigid body motion instead of deformation, thus ensuring the surface accuracy of the reflector. However, ideal static constraints are often difficult to achieve or have poor tolerance to the mechanical environment. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to propose a quasi-static support structure for a space remote sensor reflector, and to realize quasi-static support of the reflector by releasing the freedom constraints in a specific direction through a leaf spring group and a spherical bearing.

[0004] The solution of the present invention is:

[0005] The quasi-static support structure of the space remote sensor reflector includes the reflector and three leaf spring array support components;

[0006] Among them, the reflector is a horizontally placed plate-shaped structure; three leaf spring array support components are arranged on the lower surface of the reflector, and the three leaf spring array support components are evenly distributed along the circumference with the center of the reflector as the center.

[0007] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the leaf spring array support assembly is a cylindrical structure with a groove on the top; the axis of the leaf spring array support assembly is arranged along the radial direction of the reflector;

[0008] Or the axes of the three leaf spring array support assemblies are perpendicular to the radial direction of the reflector, and the axes of the three leaf spring array support assemblies form an equilateral triangle.

[0009] In the above-mentioned quasi-static support structure of the space remote sensor reflector, a long groove is provided on the lower surface of the reflector at a position corresponding to each leaf spring array support assembly and along the axial direction of the corresponding leaf spring array support assembly; the curvature of the long groove is consistent with the curvature of the cylindrical outer wall of the leaf spring array support assembly, so that the leaf spring array support assembly is installed on the lower surface of the reflector by embedding it in the long groove.

[0010] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the reflector is provided with a cylindrical protrusion in the middle of the corresponding long slot; when the leaf spring array support assembly is installed at the long slot position, the cylindrical protrusion is embedded in the top groove of the leaf spring array support assembly.

[0011] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the leaf spring array support component is provided with a through hole along the axial direction; the cylindrical protrusion is provided with a corresponding through hole; after the cylindrical protrusion is embedded in the top groove of the leaf spring array support component, the through holes are coaxially butted.

[0012] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the leaf spring array support assembly includes a support seat, a support shaft, a spherical bearing, an inner ring locking nut, an outer ring locking nut and two leaf spring arrays;

[0013] Among them, the support seat is a horizontally placed plate-like structure; the support shaft is axially arranged horizontally above the support seat; a leaf spring array is respectively installed at both axial ends of the support shaft; the joint bearing is installed in the middle of the support shaft; the inner ring locking nut is installed on the outer wall at both ends of the support shaft, and the inner ring locking nut axially contacts the side walls of the shaft ends of the two leaf spring arrays to achieve axial limitation of the outer inner diameters of the two leaf spring arrays; the outer ring locking nut is installed on the outer walls on both sides of the two leaf spring arrays, and the outer ring locking nut axially contacts the axial outer diameter ends of the two leaf spring arrays to achieve axial limitation of the outer diameter ends of the two leaf spring arrays.

[0014] In the above-mentioned quasi-static support structure for the space remote sensor reflector, both axial ends of the support shaft are step structures; the steps at each end are used to limit the inner side wall of the leaf spring array.

[0015] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the movement process of the leaf spring array support assembly is:

[0016] The support shaft drives the inner diameter of the two leaf spring arrays and the inner ring locking nut to move axially; the outer ring locking nut is fixed on the support seat and does not move, thereby limiting the outer diameter of the two leaf spring arrays.

[0017] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the leaf spring array includes n leaf springs; the n leaf springs are coaxially stacked; and n is a positive integer not less than 4.

[0018] In the above-mentioned quasi-static support structure of the space remote sensor reflector, the side wall of the leaf spring is provided with no less than 3 grooves; the shape of the groove is an Archimedean spiral; the polar coordinate equation of the Archimedean spiral is:

[0019] ρ=r min +k·θ

[0020] Where ρ is the polar diameter of the spiral under the polar coordinate equation;

[0021] r min is the distance between the starting point of the spiral and the center of the polar coordinates;

[0022] k is the pitch between the spirals;

[0023] θ is the polar angle of the spiral under the polar coordinate equation.

[0024] The beneficial effects of the present invention compared with the prior art are:

[0025] (1) Each spherical bearing of the present invention constrains 3 translational degrees of freedom, and 3 spherical bearings constrain 9 degrees of freedom, and then 3 degrees of freedom are approximately released through the leaf spring array, thereby achieving quasi-static constraints of 6 degrees of freedom;

[0026] (2) The present invention realizes that when the ambient temperature changes, the reflector undergoes a small rigid body movement instead of deformation through the design of the leaf spring array, thereby ensuring the surface accuracy of the reflector; the superposition of multiple leaf springs can further improve the radial stiffness and the bending and torsional stiffness, while ensuring that the axial stiffness of the leaf spring is small. This situation can be approximately regarded as the three axial degrees of freedom of the spring assembly being released;

[0027] (3) The leaf spring of the present invention has no less than three grooves on its side wall, and the grooves are in the shape of Archimedean spirals. The axial stiffness of the leaf spring and the stress distribution during deformation can be changed by designing the shape of the spiral. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the first distribution of three leaf spring array support components of the present invention;

[0029] Figure 2 This is a schematic diagram of the second distribution of three leaf spring array support components of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the leaf spring array support assembly of the present invention;

[0031] Figure 4 It is a schematic diagram of a leaf spring of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the embodiments.

[0033] The invention provides a quasi-statically determinate support structure for a space remote sensor reflector, and realizes quasi-statically determinate support for the reflector by releasing the freedom constraint in a specific direction through a leaf spring group and a spherical bearing.

[0034] Quasi-static support structure of space remote sensor reflector, such as Figure 1 , Figure 2 As shown, it specifically includes a reflector 1 and three leaf spring array support assemblies 2. The reflector 1 is a horizontally placed plate-shaped structure; the three leaf spring array support assemblies 2 are arranged on the lower surface of the reflector 1, and the three leaf spring array support assemblies 2 are evenly distributed along the circumference with the center of the reflector 1 as the center.

[0035] like Figure 1 As shown, the leaf spring array support assembly 2 is a cylindrical structure with a groove on the top; the axis of the leaf spring array support assembly 2 is arranged along the radial direction of the reflector 1. Figure 2 As shown, the axes of the three leaf spring array support assemblies 2 are perpendicular to the radial direction of the reflector 1, and the axes of the three leaf spring array support assemblies 2 form an equilateral triangle.

[0036] A long groove is provided on the lower surface of the reflector 1 at a position corresponding to each leaf spring array support assembly 2 along the axial direction of the corresponding leaf spring array support assembly 2; the curvature of the long groove is consistent with the curvature of the cylindrical outer wall of the leaf spring array support assembly 2, so that the leaf spring array support assembly 2 is installed on the lower surface of the reflector 1 by embedding it in the long groove.

[0037] The reflector 1 is provided with a cylindrical protrusion in the middle of the corresponding long slot; when the leaf spring array support component 2 is installed at the long slot position, the cylindrical protrusion is embedded in the top groove of the leaf spring array support component 2.

[0038] The leaf spring array support component 2 is provided with a through hole along the axial direction; the cylindrical protrusion is provided with a corresponding through hole; after the cylindrical protrusion is embedded in the top groove of the leaf spring array support component 2, the through holes are coaxially butted.

[0039] like Figure 3 As shown, the leaf spring array support assembly 2 includes a support seat 21, a support shaft 22, a spherical bearing 23, an inner ring locking nut 24, an outer ring locking nut 25 and two leaf spring arrays 26. Among them, the support seat 21 is a horizontally placed plate-like structure; the support shaft 22 is axially arranged horizontally above the support seat 21; a leaf spring array 26 is respectively mounted on the axial ends of the support shaft 22; the spherical bearing 23 is mounted on the middle part of the support shaft 22; the inner ring locking nut 24 is mounted on the outer wall at both ends of the support shaft 22, and the axial direction of the inner ring locking nut 24 contacts the axial end side wall of the two leaf spring arrays 26 to achieve axial limit on the outer inner diameter of the two leaf spring arrays 26; the outer ring locking nut 25 is installed on the outer walls of both sides of the two leaf spring arrays 26, and the outer ring locking nut 25 contacts the axial outer diameter ends of the two leaf spring arrays 26 to achieve axial limit on the axial outer diameter ends of the two leaf spring arrays 26. Both axial ends of the support shaft 22 are step structures; the steps at each end are used to limit the inner wall of the leaf spring array 26 .

[0040] The movement process of the leaf spring array support assembly 2 is:

[0041] The support shaft 22 drives the inner diameter of the two leaf spring arrays 26 and the inner ring locking nut 24 to move axially; the outer ring locking nut 25 is fixed on the support seat 21 and does not move, thereby limiting the outer diameter of the two leaf spring arrays 26.

[0042] like Figure 4 As shown, the leaf spring array 26 is composed of a series of leaf springs stacked axially, and the inner and outer edges are respectively pressed by the inner ring locking nut and the outer ring locking nut. An annular boss is set on the inner and outer edges of each leaf spring. The leaf spring array 26 includes n leaf springs; n leaf springs are coaxially stacked; n is a positive integer not less than 4. There are no less than 3 grooves on the side wall of the leaf spring; the shape of the groove is an Archimedean spiral; the polar coordinate equation of the Archimedean spiral is:

[0043] ρ=r min +k·θ

[0044] Where ρ is the polar diameter of the spiral under the polar coordinate equation;

[0045] r min is the distance between the starting point of the spiral and the center of the polar coordinates;

[0046] k is the pitch between the spirals;

[0047] θ is the polar angle of the spiral in polar coordinates.

[0048] The characteristics of this type of leaf spring are that the radial stiffness is much greater than the axial stiffness, allowing large elastic deformation in the axial direction while ensuring that there is no radial displacement at the center. By adjusting the shape of the helix, the axial stiffness of the leaf spring and the stress distribution during deformation can be changed. The superposition of multiple leaf springs can further increase the radial stiffness and the bending and torsional stiffness while ensuring that the axial stiffness of the leaf spring is small. This situation can be roughly regarded as the three axial degrees of freedom of the spring assembly being released.

[0049] The installation process of the quasi-static support structure of the reflector is as follows:

[0050] Firstly, the raised through hole size on the back of the reflector is matched according to the outer diameter size of the spherical bearing so that the two can maintain zero-gap contact, and the spherical bearing is installed in the raised hole on the back of the reflector for fixation; secondly, the outer diameter size of the support shaft is matched according to the inner diameter size of the spherical bearing so that the two can maintain zero-gap contact; then, a series of leaf springs are stacked axially, installed on the inner diameter of the support seat from both sides of the axial direction of the support seat, and locked by the outer ring locking nut; then, the support shaft is passed through the inner diameter of the leaf spring on one side, the inner diameter of the spherical bearing, and the inner diameter of the leaf spring on the other side in turn, and locked by the inner ring locking nut in combination with the threads at both ends of the support shaft; then, the same operation is performed on the other two sets of leaf spring array assemblies to obtain a reflector assembly; finally, the installation of the reflector assembly and the exterior is achieved through the respective mounting holes at the bottom of the three support seats.

[0051] Each joint bearing of the present invention constrains three translational degrees of freedom, three joint bearings constrain nine degrees of freedom, and then three degrees of freedom are approximately released through a leaf spring array, thereby achieving quasi-static constraints of six degrees of freedom.

[0052] The present invention realizes that when the ambient temperature changes, the reflector undergoes a tiny rigid body movement instead of deformation through the design of a leaf spring array, thereby ensuring the surface accuracy of the reflector; the superposition of multiple leaf springs can further improve the radial stiffness and the bending and torsional stiffness, while ensuring that the axial stiffness of the leaf spring is small. This situation can be approximately regarded as the three axial degrees of freedom of the spring assembly being released.

[0053] The leaf spring of the present invention has no less than three grooves arranged on its side wall, and the grooves are in the shape of Archimedean spirals. The axial stiffness of the leaf spring and the stress distribution during deformation can be changed by designing the shape of the spirals.

[0054] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A quasi-static support structure for a space remote sensor reflector, characterized in that: It comprises a reflector (1) and three leaf spring array support assemblies (2); The reflector (1) is a horizontally placed plate-shaped structure; three leaf spring array support assemblies (2) are arranged on the lower surface of the reflector (1), and the three leaf spring array support assemblies (2) are evenly distributed along the circumference with the center of the reflector (1) as the center.

2. The quasi-static support structure for a space remote sensor reflector according to claim 1, characterized in that: The leaf spring array support assembly (2) is a cylindrical structure with a groove arranged on the top; the axis of the leaf spring array support assembly (2) is arranged along the radial direction of the reflector (1); Or the axes of the three leaf spring array support assemblies (2) are perpendicular to the radial direction of the reflector (1), and the axes of the three leaf spring array support assemblies (2) form an equilateral triangle.

3. The quasi-static support structure for a space remote sensor reflector according to claim 2, characterized in that: The lower surface of the reflector (1) is provided with a long groove at a position corresponding to each leaf spring array support assembly (2) along the axial direction of the corresponding leaf spring array support assembly (2); the curvature of the long groove is consistent with the curvature of the cylindrical outer wall of the leaf spring array support assembly (2), so that the leaf spring array support assembly (2) is installed on the lower surface of the reflector (1) by being embedded in the long groove.

4. The quasi-static support structure for a space remote sensor reflector according to claim 3, characterized in that: The reflector (1) is provided with a cylindrical protrusion in the middle of the corresponding long slot; when the leaf spring array support component (2) is installed at the long slot position, the cylindrical protrusion is embedded in the top groove of the leaf spring array support component (2).

5. The quasi-static support structure for a space remote sensor reflector according to claim 4, characterized in that: The leaf spring array support component (2) is provided with a through hole along the axial direction; the cylindrical protrusion is provided with a corresponding through hole; after the cylindrical protrusion is embedded in the top groove of the leaf spring array support component (2), the through holes are coaxially butted.

6. The quasi-statically determinate support structure for a space remote sensor reflector according to claim 4, characterized in that: The leaf spring array support assembly (2) comprises a support seat (21), a support shaft (22), a joint bearing (23), an inner ring locking nut (24), an outer ring locking nut (25) and two leaf spring arrays (26); The support seat (21) is a horizontally placed plate-like structure; the support shaft (22) is axially arranged horizontally above the support seat (21); a leaf spring array (26) is respectively mounted on the two axial ends of the support shaft (22); the joint bearing (23) is mounted on the middle part of the support shaft (22); the inner ring locking nut (24) is mounted on the outer wall of the two ends of the support shaft (22), and the inner ring locking nut (24) is axially in contact with the side walls of the shaft ends of the two leaf spring arrays (26) to achieve axial limitation of the outer inner diameters of the two leaf spring arrays (26); the outer ring locking nut (25) is installed on the outer walls of both sides of the two leaf spring arrays (26), and the outer ring locking nut (25) is axially in contact with the axial outer diameter ends of the two leaf spring arrays (26) to achieve axial limitation of the axial outer diameter ends of the two leaf spring arrays (26).

7. The quasi-statically determinate support structure for a space remote sensor reflector according to claim 6, characterized in that: Both axial ends of the support shaft (22) are step structures; the steps at each end are used to limit the inner side wall of the leaf spring array (26).

8. The quasi-static support structure for a space remote sensor reflector according to claim 6, characterized in that: The movement process of the leaf spring array support assembly (2) is as follows: The support shaft (22) drives the inner diameter of the two leaf spring arrays (26) and the inner ring locking nut (24) to move axially; the outer ring locking nut (25) is fixed on the support seat (21) to limit the outer diameter of the two leaf spring arrays (26).

9. The quasi-statically determinate support structure for a space remote sensor reflector according to claim 6, characterized in that: The leaf spring array (26) comprises n leaf springs; the n leaf springs are coaxially stacked; and n is a positive integer not less than 4.

10. The quasi-statically determinate support structure for a space remote sensor reflector according to claim 9, characterized in that: The side wall of the leaf spring is provided with no less than 3 grooves; the shape of the grooves is an Archimedean spiral; the polar coordinate equation of the Archimedean spiral is: p=r min +k·θ Where ρ is the polar diameter of the spiral under the polar coordinate equation; r min is the distance between the starting point of the spiral and the center of the polar coordinates; k is the pitch between the spirals; θ is the polar angle of the spiral in polar coordinates.

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