Quasi-static support structure for space remote sensor mirrors

Abstract

The present application relates to a quasi-static support structure of a space remote sensor mirror, and belongs to the field of support of a space remote sensor mirror; comprising a mirror and three plate spring array support assemblies; wherein the mirror is a plate-shaped structure horizontally placed; the three plate spring array support assemblies are arranged on the lower surface of the mirror, and the three plate spring array support assemblies are uniformly distributed in the circumferential direction with the center of the mirror as the center; the plate spring array support assembly is a cylindrical structure with a groove arranged on the top; the axis of the plate spring array support assembly is arranged along the radial direction of the mirror; or the axes of the three plate spring array support assemblies are perpendicular to the radial direction of the mirror, and the axes of the three plate spring array support assemblies enclose an equilateral triangle; the quasi-static support of the mirror is realized by releasing the specific direction freedom degree constraint through the plate spring assembly and the joint bearing.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of space remote sensor mirror support, and relates to a quasi-static support structure of a space remote sensor mirror. BACKGROUND

[0002] Reflective optical systems have a wide range of applications in space remote sensors, and the support of a mirror is very critical to the performance of the system. The support of the mirror needs to ensure the surface accuracy and position accuracy of the mirror, and needs to consider the mechanical environment in the launch phase and the temperature environment fluctuation in orbit. The kinematic support based on the static constraint theory is an ideal mirror support structure form. The kinematic support just constrains the 6 degrees of freedom of the mirror, and when the environmental temperature changes, the mirror undergoes a small rigid body motion instead of deformation, so that the surface accuracy of the mirror can be ensured. However, ideal static constraints are often difficult to achieve or have poor mechanical environment bearing capacity. SUMMARY

[0003] The application solves the technical problem of overcoming the shortcomings of the prior art and providing a quasi-static support structure of a space remote sensor mirror, which realizes quasi-static support of the mirror by releasing the constraint of specific direction degrees of freedom through a plate spring group and a joint bearing.

[0004] The technical solution of the application is as follows:

[0005] The quasi-static support structure of the space remote sensor mirror comprises a mirror and three plate spring array support assemblies.

[0006] The mirror is a plate-shaped structure placed horizontally; the three plate spring array support assemblies are arranged on the lower surface of the mirror, and the three plate spring array support assemblies are uniformly distributed in the circumferential direction with the center of the mirror as the center.

[0007] In the quasi-static support structure of the space remote sensor mirror, the plate spring array support assembly is a cylindrical structure with a groove arranged at the top; the axis of the plate spring array support assembly is arranged along the radial direction of the mirror.

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

[0009] In the quasi-static support structure of the space remote sensor mirror, a long slot is arranged on the lower surface of the mirror in the position corresponding to each plate spring array support assembly along the axial direction of the corresponding plate spring array support assembly; the curvature of the long slot is consistent with the curvature of the cylindrical outer wall of the plate spring array support assembly, so that the plate spring array support assembly is installed on the lower surface of the mirror by being embedded in the long slot.

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

[0011] In the above-mentioned quasi-static support structure of space remote sensor mirror, the plate spring array support assembly is provided with a through hole in 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 plate spring array support assembly, the through holes are coaxially connected.

[0012] In the above-mentioned quasi-static support structure of space remote sensor mirror, the plate spring array support assembly comprises a support seat, a support shaft, a joint bearing, an inner ring locking nut, an outer ring locking nut and two plate spring arrays.

[0013] The support seat is a horizontally placed plate structure; the support shaft is horizontally arranged in the axial direction above the support seat; one plate spring array is sleeved on each end of the support shaft in the axial direction; the joint bearing is sleeved on the middle part of the support shaft; the inner ring locking nut is sleeved on the outer wall of the two ends of the support shaft, and the axial direction of the inner ring locking nut is in contact with the axial end side wall of the two plate spring arrays, thereby achieving axial limiting of the inner diameter of the two plate spring arrays; the outer ring locking nut is installed on the outer wall of the two plate spring arrays, and the axial direction of the outer ring locking nut is in contact with the axial outer diameter end of the two plate spring arrays, thereby achieving limiting of the axial outer diameter end of the two plate spring arrays.

[0014] In the above-mentioned quasi-static support structure of space remote sensor mirror, the axial ends of the support shaft are both stepped structures; each step realizes limiting of the inner side wall of the plate spring array.

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

[0016] The inner diameter of the two plate spring arrays and the inner ring locking nut are moved in the axial direction by the support shaft; the outer ring locking nut is fixed on the support seat and does not move, thereby realizing limiting of the outer diameter of the two plate spring arrays.

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

[0018] In the above-mentioned quasi-static support structure of space remote sensor mirror, the side wall of the plate spring is provided with not less than three cut grooves; the shape of the cut groove is an Archimedes spiral; the polar equation of the Archimedes spiral is as follows:

[0019] ρ=r min +k·θ

[0020] In the formula, p is the polar radius of the spiral in the polar coordinate equation;

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

[0022] k is the pitch between the spirals;

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

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

[0025] (1) Each joint bearing of the present application constrains 3 translational degrees of freedom, 3 joint bearings constrain 9 degrees of freedom, and then 3 degrees of freedom are approximately released through the plate spring array, so as to realize 6 degrees of freedom quasi-static constraint;

[0026] (2) Through the design of the plate spring array, the present application realizes that when the environmental temperature changes, the mirror undergoes a small rigid body motion instead of deformation, so that the surface accuracy of the mirror can be guaranteed; the radial stiffness, the bending and torsional stiffness can be further improved by superimposing multiple plate springs, while the axial stiffness of the plate spring is small, which can be approximately regarded as the three axial degrees of freedom of the spring assembly being released;

[0027] (3) The side wall of the plate spring of the present application is provided with not less than 3 cutting grooves, and the shape of the cutting grooves is an Archimedes spiral, and by designing the shape of the spiral line, the axial stiffness of the plate spring and the stress distribution when deformed can be changed. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the first distribution schematic diagram of the three plate spring array support assemblies of the present application;

[0029] Figure 2 is the second distribution schematic diagram of the three plate spring array support assemblies of the present application;

[0030] Figure 3 is the structure schematic diagram of the plate spring array support assembly of the present application;

[0031] Figure 4 is the schematic diagram of the plate spring of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described below in combination with examples.

[0033] The present application provides a quasi-static support structure for a space remote sensor mirror, which realizes quasi-static support of the mirror by releasing the constraint of specific direction degrees of freedom through a plate spring group and a joint bearing.

[0034] The quasi-static support structure for a space remote sensor mirror, such as Figure 1 ,Figure 2 As shown in the figure, it specifically includes a mirror 1 and three plate spring array support assemblies 2. Among them, the mirror 1 is a horizontally placed plate structure; the three plate spring array support assemblies 2 are arranged on the lower surface of the mirror 1, and the three plate spring array support assemblies 2 are uniformly distributed along the circumference with the center of the mirror 1 as the center.

[0035] As shown in the figure, Figure 1 The plate spring array support assembly 2 is a cylindrical structure with a groove at the top; the axis of the plate spring array support assembly 2 is arranged along the radial direction of the mirror 1. As shown in the figure, Figure 2 Or the axis of the three plate spring array support assemblies 2 is perpendicular to the radial direction of the mirror 1, and the axis of the three plate spring array support assemblies 2 forms an equilateral triangle.

[0036] The lower surface of the mirror 1 is provided with a long slot in the position corresponding to each plate spring array support assembly 2 along the axial direction of the corresponding plate spring array support assembly 2; the curvature of the long slot is consistent with the curvature of the cylindrical outer wall of the plate spring array support assembly 2, so that the plate spring array support assembly 2 is installed on the lower surface of the mirror 1 by being embedded in the long slot.

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

[0038] The plate spring array support assembly 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 plate spring array support assembly 2, the through hole is coaxially connected.

[0039] As shown in the figure, Figure 3 The plate spring array support assembly 2 includes 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 plate spring arrays 26. Among them, the support seat 21 is a horizontally placed plate structure; the support shaft 22 is horizontally arranged in the axial direction above the support seat 21; one plate spring array 26 is sleeved on each end of the support shaft 22; the joint bearing 23 is sleeved on the middle part of the support shaft 22; the inner ring locking nut 24 is sleeved on the outer wall of both ends of the support shaft 22, and the axial direction of the inner ring locking nut 24 is in contact with the axial end side wall of the two plate spring arrays 26, so as to limit the axial direction of the inner diameter of the outer side of the two plate spring arrays 26; the outer ring locking nut 25 is installed on the outer wall of both sides of the two plate spring arrays 26, and the axial direction of the outer ring locking nut 25 is in contact with the axial outer diameter end of the two plate spring arrays 26, so as to limit the axial outer diameter end of the two plate spring arrays 26. Both ends of the support shaft 22 are stepped structures; the step at each end limits the inner side wall of the plate spring array 26.

[0040] The movement process of the plate spring array support assembly 2 is as follows:

[0041] The support shaft 22 drives the inner diameter of the two plate 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 plate spring arrays 26.

[0042] As shown in Figure 4 The plate spring array 26 is composed of a series of plate springs stacked axially, and the inner and outer edges are pressed by the inner and outer ring locking nuts. The inner and outer edges of each plate spring are provided with annular bosses. The plate spring array 26 includes n plate springs; the n plate springs are coaxially stacked; n is a positive integer not less than 4. The side wall of the plate spring is provided with not less than three cut grooves; the shape of the cut groove is an Archimedes spiral; the polar equation of the Archimedes spiral is:

[0043] ρ=r min +k·θ

[0044] In the formula, ρ is the polar radius of the spiral in the polar equation; r is the distance from the starting point of the spiral to the center of the polar coordinate; k is the pitch between the spirals; and θ is the polar angle of the spiral in the polar equation.

[0045] r min +k·θ

[0046] k is the pitch between the spirals; and θ is the polar angle of the spiral in the polar equation.

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

[0048] The characteristics of such plate springs are that the radial stiffness is much greater than the axial stiffness, allowing a large elastic deformation in the axial direction, while ensuring that the center position has no radial displacement. By adjusting the shape of the spiral, the axial stiffness of the plate spring and the stress distribution when deformed can be changed. The radial stiffness and bending and torsional stiffness can be further improved by stacking multiple plate springs, while ensuring that the axial stiffness of the plate spring is small. In this case, the three axial degrees of freedom of the spring assembly can be approximately considered to be released.

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

[0050] First, according to the outer diameter size of the joint bearing, the size of the through hole of the back convex of the mirror is matched, so that the two can maintain zero gap contact, and the joint bearing is installed in the hole of the back convex of the mirror and fixed; second, according to the inner diameter size of the joint bearing, the outer diameter size of the support shaft is matched, so that the two can maintain zero gap contact; then, a series of plate springs are stacked in the axial direction, and are respectively installed in the inner diameter of the support seat from the axial two sides of the support seat, and are locked through the outer ring locking nut; then, the support shaft is sequentially inserted through the inner diameter of the plate spring on one side, the inner diameter of the joint bearing and the inner diameter of the plate spring on the other side, and is locked through the inner ring locking nut matched with the threads at both ends of the support shaft; then, the same operation is performed on the other two groups of plate spring array assemblies to obtain the mirror assembly; finally, the mirror assembly and the outside are installed through the respective mounting holes at the bottoms of the three support seats.

[0051] Each joint bearing of the present application restricts 3 translational degrees of freedom, 3 joint bearings restrict 9 degrees of freedom, and then 3 degrees of freedom are approximately released through the plate spring array, so as to realize the quasi-static constraint of 6 degrees of freedom.

[0052] Through the design of the plate spring array, the present application realizes that when the environmental temperature changes, the mirror has a small rigid body motion instead of deformation, so that the surface accuracy of the mirror can be guaranteed; the radial stiffness, the bending and torsional stiffness are further improved by the superposition of multiple plate springs, while the axial stiffness of the plate spring is small, which can be approximately regarded as the three axial degrees of freedom of the spring assembly being released.

[0053] The side wall of the plate spring of the present application is provided with not less than 3 cutting grooves, and the shape of the cutting grooves is an Archimedes spiral, so that the axial stiffness of the plate spring and the stress distribution when deformed can be changed by designing the shape of the spiral.

[0054] Although the present application has been disclosed with the above preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application, therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not deviate from the technical solutions of the present application, all belong to the protection scope of the technical solutions of the present application.

Claims

1. Quasi-statically determinate support structure for a mirror of a space remote sensor, characterized in that: The mirror (1) and three plate spring array support assemblies (2) are included. The mirror (1) is a horizontally placed plate structure; the three plate spring array support assemblies (2) are arranged on the lower surface of the mirror (1), and the three plate spring array support assemblies (2) are uniformly distributed along the circumference with the center of the mirror (1) as the center. The plate spring array support assembly (2) includes 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 plate spring arrays (26). The support seat (21) is a horizontally placed plate structure; the support shaft (22) is arranged axially and horizontally above the support seat (21); one plate spring array (26) is sleeved on each end of the support shaft (22); the joint bearing (23) is sleeved on the middle part of the support shaft (22); the inner ring locking nut (24) is sleeved on the outer wall of the two ends of the support shaft (22), and the axial direction of the inner ring locking nut (24) is in contact with the axial end side wall of the two plate spring arrays (26), thereby achieving axial limiting of the inner diameter of the two plate spring arrays (26) on the outer side; the outer ring locking nut (25) is installed on the outer wall of the two plate spring arrays (26), and the axial direction of the outer ring locking nut (25) is in contact with the axial outer diameter end of the two plate spring arrays (26), thereby achieving limiting of the axial outer diameter end of the two plate spring arrays (26).

2. The spatial remote sensor mirror quasi-static support structure of claim 1, wherein: The plate spring array support assembly (2) is a cylindrical structure with a groove on the top; the axis of the plate spring array support assembly (2) is arranged along the radial direction of the mirror (1); Or the axes of the three plate spring array support assemblies (2) are perpendicular to the radial direction of the mirror (1), and the axes of the three plate spring array support assemblies (2) form an equilateral triangle.

3. The spatial remote sensor mirror quasi-static support structure of claim 2, wherein: The lower surface of the mirror (1) is provided with a long slot in the axial direction corresponding to each plate spring array support assembly (2) at the position corresponding to each plate spring array support assembly (2); the curvature of the long slot is consistent with the curvature of the cylindrical outer wall of the plate spring array support assembly (2), so that the plate spring array support assembly (2) is installed on the lower surface of the mirror (1) by being embedded in the long slot.

4. The spatial remote sensor mirror quasi-static support structure of claim 3, wherein: The mirror (1) is provided with a cylindrical protrusion in the middle of the corresponding long slot; when the plate spring array support assembly (2) is installed at the position of the long slot, the cylindrical protrusion is embedded in the groove on the top of the plate spring array support assembly (2).

5. The spatial remote sensor mirror quasi-static support structure of claim 4, wherein: The plate spring array support assembly (2) is provided with a through hole in the axial direction; the cylindrical protrusion is provided with a corresponding through hole; after the cylindrical protrusion is embedded in the groove on the top of the plate spring array support assembly (2), the through hole is coaxially connected.

6. The spatial remote sensor mirror quasi-static support structure of claim 5, wherein: The axial ends of the support shaft (22) are both stepped structures; the steps on each end realize limiting of the inner side wall of the plate spring array (26).

7. The spatial remote sensor mirror quasi-static support structure of claim 6, wherein: The movement process of the plate spring array support assembly (2) is as follows: The inner diameter of the two plate spring arrays (26) and the inner ring locking nut (24) are moved in the axial direction by the support shaft (22); 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 plate spring arrays (26).

8. The spatial remote sensor mirror quasi-static support structure of claim 7, wherein: The leaf spring array (26) comprises n leaf springs; the n leaf springs are coaxially stacked; n is a positive integer not less than 4.

9. The space remote sensor mirror quasi-static support structure of claim 8, wherein: The side wall of the leaf spring is provided with not less than 3 cut grooves; the shape of the cut groove is an Archimedes spiral; the polar coordinate equation of the Archimedes spiral is: p = r min + k · θ In the formula, p is the polar radius of the spiral in the polar coordinate equation; r min is the distance of the helix starting point from the polar coordinate center; K is the pitch between the spirals; Theta is the polar angle of the spiral in the polar coordinate equation.

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