Large aperture mirror high damping isolation support device

Abstract

A high-damping seismic isolation support device for a large-aperture reflector includes three sets of damping truss assemblies evenly distributed along the circumference. Each damping truss assembly is an inverted V-shaped structure. The top seat of each damping truss assembly is bolted to the mounting plane of the reflector, and two bases are fixed to the mounting plate of the optical assembly. The large-aperture reflector is bonded to the structure through three top seats; it is connected and fixed to the mounting plate of the optical assembly through six bases; a base plate spring initially absorbs vibrations from the environment; and damping rubber further absorbs vibrations, achieving heat dissipation and vibration reduction functions. Together with the articulated rod structure, it provides freedom of movement in six directions. This invention meets the reflector support requirements for complex environments such as high-frequency, low-frequency, and micro-vibration applications. It can comprehensively control the base displacement and the response acceleration of the superstructure, with a simple overall structure and high space utilization.

Description

Technical Field

[0001] This invention belongs to the field of optomechanical structure of space optical remote sensors, and specifically relates to a high-damping vibration isolation support device for large-aperture mirrors. Background Technology

[0002] As the resolution of remote sensing satellites continues to improve, the demand for high-quality imaging is also increasing. The impact of micro-vibrations caused by onboard moving parts (such as momentum wheels, high-speed rotating components like CMGs, stepping components like solar array drive mechanisms, and oscillating components like infrared camera mirrors) on imaging quality is becoming increasingly significant. Therefore, micro-vibration suppression has become a necessary measure to ensure image quality. Vibration isolation support devices are core components of modern optical systems, and their isolation frequency range and stability determine whether the performance indicators of the entire optical system can meet the design specifications.

[0003] To avoid excessive displacement of the isolation layer in base-isolated structures under low-frequency micro-vibration excitation, traditional dampers (such as oil dampers or metal yield dampers) are often added to the isolation layer. However, under high-frequency vibration sources, such as refrigerators or flywheels, too many traditional dampers may generate excessive damping forces, leading to an increase in the response acceleration of the superstructure connected to the dampers. To address the high sensitivity of traditional isolation systems (combination of isolation bearings and traditional dampers) to excitation frequencies, it is necessary to develop new high-performance damping devices that can comprehensively control the base displacement and superstructure response acceleration of the isolation structure under micro-vibration excitation in different frequency ranges. Traditional damping and vibration reduction devices can be mainly divided into two types: velocity type and displacement type. Velocity type dampers provide damping force that is related to velocity, and the damping force generated under high-frequency micro-vibration excitation may be too large. Displacement type dampers mainly use the yielding of materials to achieve energy dissipation and vibration reduction, but they have the disadvantages of not dissipating energy when the deformation is less than the yield displacement, and the equivalent damping ratio will decrease as the deformation increases when the deformation is much greater than the yield displacement.

[0004] Besides vibration damping devices, installing a viscoelastic damping structure on the back of the reflector is a widely accepted method. This type of damping structure is highly flexible, easy to install, and adaptable to structures of different shapes. It can be implemented after the satellite structure is finalized, providing significant local vibration reduction, and is particularly suitable for vibration reduction after spacecraft design is finalized. In 2004, the application of additional constraint damping layers was successfully used on the axial engine of the Fengyun-2 meteorological satellite, and it is operating normally in orbit. Viscoelastic damping was also successfully applied to the satellite launched in 1996. On satellites. However, viscoelastic materials have low stiffness and damping performance, with structural damping only in the range of 0.2 to 0.5, and the temperature difference requirement is no more than 50°C, making it relatively difficult to promote their application in camera optical structures. Summary of the Invention

[0005] The purpose of this invention is to overcome the insufficient micro-vibration suppression capability of existing optical mirror isolation technology, and to provide a high-damping vibration isolation support device for large-diameter mirrors, which meets the mirror support requirements of complex environments such as high frequency, low frequency, and micro-vibration. It can comprehensively control the base displacement and the response acceleration of the superstructure, and has a simple overall structure and high space utilization.

[0006] To achieve the above objectives, the present invention provides a high-damping seismic isolation support device for a large-diameter reflector, comprising three sets of damping truss assemblies evenly distributed along the circumference.

[0007] Each damping truss assembly is an inverted V-shaped structure, including two bases, one top seat, two support rods, two articulated rods A, one articulated rod B, one articulated rod C, and two damping sleeves. Each support rod is fitted with a damping sleeve to form a support body. One support body is connected to a base at one end via an articulated rod A and to the top seat at the other end via an articulated rod C; the other support body is connected to another base at one end via another articulated rod A and to the top seat at the other end via an articulated rod B.

[0008] The top of each damping truss assembly is bolted to the mounting plane of the reflector, and the two bases are fixed to the mounting plate of the optical assembly.

[0009] Preferably, the damping sleeve includes an adapter, a damping layer, and a support cylinder. The adapter is fitted onto the upper part of the support rod, the damping layer is installed on the lower periphery of the support rod, and the support cylinder is fitted onto the outside of the damping layer. The support cylinder and the adapter are connected by threads.

[0010] Preferably, the height of the damping layer is 5 / 6 of the height of the support rod, and the height of the adapter is 1 / 6 of the height of the support rod.

[0011] Preferably, the damping layer consists of an inner nut, an outer nut, and a damping array, with the two ends of the damping array fastened by the inner nut and the outer nut.

[0012] Preferably, the shock-absorbing array consists of three groups, located at the upper, middle, and lower parts of the shock-absorbing sleeve, respectively;

[0013] Each damping array includes several damping units. Each damping unit includes a base plate spring, a constrained aluminum layer, and a damping rubber layer. The damping rubber layer is located between the base plate spring and the constrained aluminum layer.

[0014] Each damping unit has a central hole for mounting on a support rod.

[0015] Preferably, the outer circle and center of the base plate spring are provided with protrusions, which are used to fit the damping rubber layer. The damping rubber layer is locked and fixed by the protrusions on the outer circle of the base plate spring and the constrained aluminum layer. The protrusion at the center of the base plate spring has a through hole coaxial with the center of the sleeve.

[0016] Preferably, the damping adhesive layer has a central hole and three circular holes evenly distributed around the perimeter, with three arc-shaped gaps between the central hole and the circular holes around the perimeter.

[0017] Preferably, the diameter of the supported optical mirror is ≥Ф1200mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The present invention uses metal rubber, which is widely used in the field of aerospace engineering, as the damping material, thereby enhancing the ability of the large-diameter reflector high damping vibration isolation support device to withstand high and low temperatures, corrosion, aging, etc., improving the service life of the vibration damper and expanding the application field of the vibration damper.

[0020] (2) The large-diameter reflector high-damping seismic isolation support device of the present invention adopts a shock-absorbing array in terms of structure, which has a simple structure and high space utilization.

[0021] (3) The vibration damper under rated load can achieve equal stiffness vibration reduction and damping energy dissipation in three directions: length, width and height. This product can be used for equipment vibration reduction. It is suitable for remote sensing optics fields such as large-diameter mirror support, and can also be widely used in fields such as communication and navigation satellites where there is a clear need for vibration suppression. Attached Figure Description

[0022] Figure 1 This is an assembly diagram of the large-diameter reflector high-damping seismic isolation support device of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the shock-absorbing sleeve 3 of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the base plate spring 13, damping adhesive layer 12, and constraint aluminum layer 11 of the present invention;

[0025] Figure 4 This is a schematic diagram of the damping adhesive layer of the present invention;

[0026] The attached figures are labeled as follows: 1-damping truss assembly, 2-top seat, 3-shock absorber sleeve, 4-base, 5-joint rod B, 6-joint rod C, 7-support rod, 8-shock absorber array, 9-support cylinder, 10-joint rod A, 11-constraint aluminum layer, 12-damping adhesive layer, 13-base leaf spring. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] The principle of this invention is as follows: a large-diameter reflector is bonded to the structure through three top mounts; it is connected and fixed to the mounting plate of the optical components through six bases; the base plate springs initially absorb vibrations from the environment; the damping rubber further absorbs vibrations, achieving heat dissipation and vibration reduction functions, and together with the articulated rod structure, it provides freedom in six directions; and the pin structure is used for precise positioning with the mounting foundation.

[0029] like Figure 1-3 As shown, the large-diameter reflector high-damping seismic isolation support device of the present invention includes three sets of circumferentially distributed damping truss assemblies 1.

[0030] The damping truss assembly 1 is an inverted V-shaped structure, consisting of a base 4, a top seat 2, a support rod 7, a joint rod A10, a joint rod B5, a joint rod C6, and a shock-absorbing sleeve 3. The base 4 is connected to the joint rod A10, and the top seat 2 is connected to the joint rod B5 and the joint rod C6.

[0031] Each support rod 7 is fitted with a damping sleeve 3 on its outer side, forming a support body. One end of one support body is connected to a base 4 via a joint rod A10, and the other end is connected to a top seat 2 via a joint rod C6. The other support body is connected to another base 4 via another joint rod A10, and the other end is connected to a top seat 2 via a joint rod B5. The top seat 2 of each damping truss assembly 1 is bolted to the mounting plane of the reflector, and the two bases 4 are fixed to the mounting plate of the optical assembly.

[0032] The damping sleeve 3 includes an adapter, a damping layer, and a support sleeve. The adapter is fitted onto the upper part of the support rod 7, the damping layer is installed on the lower periphery of the support rod 7, and the support sleeve is fitted onto the outside of the damping layer. The height of the damping layer is 5 / 6 of the height of the support rod 7, and the height of the adapter is 1 / 6 of the height of the support rod 7.

[0033] The damping layer consists of an inner nut, an outer nut, and a damping array 8. There are three sets of damping arrays 8, located at the upper, middle, and lower parts of the damping sleeve 3, respectively, and secured by the inner and outer nuts. Each damping array includes several damping units. Each damping unit includes a base leaf spring 13, a constraint aluminum layer 11, and a damping rubber layer 12, with the damping rubber layer 12 positioned between the base leaf spring 13 and the constraint aluminum layer 11. Each damping unit has a central opening for mounting on a support rod.

[0034] Each damping array consists of 30 damping units.

[0035] The number of damping units in the damping array 8 can be adjusted according to the required damping frequency range.

[0036] The base plate spring 13 has protrusions on both its outer circle and center. The protrusions are used to fit the damping rubber layer 12. The damping rubber layer 12 is locked and fixed by the protrusions on the outer circle and the constrained aluminum layer 11. The protrusion located at the center of the base plate spring 13 has a through hole coaxial with the center of the sleeve.

[0037] The aforementioned damping adhesive layer 12 has a thickness of 0.3 mm, a large circular hole in the center, and three small circular holes evenly distributed around its perimeter. There are also three arc-shaped gaps between the large and small circular holes. For example... Figure 4 As shown.

[0038] During installation, first, the damping rubber layer 12 is fixed to the base leaf spring 13 by the constraint aluminum layer 11. Then, the 30 layers of constraint aluminum layer 11, damping rubber layer 12, and base leaf spring 13 are tightened to the support rod 7 by the inner and outer nuts. Then, the other two sets of 30 layers of constraint aluminum layer 11, damping rubber layer 12, and base leaf spring 13 are also installed by the inner and outer nuts. One end of the support rod 7 is tightened to the joint rod A10, and the other end is tightened to the adapter. The adapter is locked by screwing in the support cylinder, so that the constraint aluminum layer 11, damping rubber layer 12, and base leaf spring 13 move towards the center for pressing, locking and positioning. The joint rods B5 and C6 are tightened to the adapter. Finally, the joint rod A10 is connected to the base 4, and the joint rods B5 and C6 are connected and fixed to the top seat 2.

[0039] The diameter of the supporting optical mirror is ≥Ф1200mm.

[0040] Furthermore, after assembly, the top seat 2 of each damping truss assembly 1 is bolted to the mounting plane of the reflector, and the two bases 4 are fixed to the mounting plate of the optical assembly. After bearing the rated load, the V-shaped opening angle of the damping truss assembly 1 is 96 degrees. At this time, the damping truss assembly 1 under the rated load achieves equal stiffness vibration reduction in the length, width and height directions when subjected to external load. At the same time, the damping rubber layer 12, the base plate spring 13 and the constraint aluminum layer 11 inside the damping truss assembly 1 play a role in damping energy dissipation in three directions.

[0041] This invention addresses the vibration reduction problem of large-aperture reflectors in space optical cameras under multi-directional loads and complex service environments. It designs a high-damping vibration isolation support device, assembled from a constrained aluminum layer 11, a damping rubber layer 12, a base leaf spring 13, and other metal connecting components. This metal / rubber composite vibration reduction device can meet the requirements of complex environments such as high-frequency, low-frequency, and micro-vibration applications. It uses the damping rubber layer 12, the base leaf spring 13, and the constrained aluminum layer 11 as the core vibration reduction and isolation components, resulting in a simple overall structure and high space utilization. Under rated loads... After loading, the included angle of each V-shaped opening is 96 degrees, thereby achieving the requirement of equal stiffness vibration reduction in the length, width and height directions of the vibration damper; when the vibration damper is subjected to multi-directional loads under rated load, the damping rubber layer 12, the base plate spring 13 and the constraint aluminum layer 11 inside can play a three-dimensional damping energy dissipation and vibration reduction role; in addition, in order to prevent the high-damping vibration isolation support device from overload, the damping rubber layer 12, the base plate spring 13 and the constraint aluminum layer 11 may undergo plastic deformation, and a limiting structure is designed for the high-damping vibration isolation support device to ensure that the vibration damping spring works within the elastic range.

[0042] The present invention has been disclosed above in the form of a technical solution. Any simple modifications, equivalent changes and alterations 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 high-damping seismic isolation support device for a large-diameter reflector, characterized in that, It includes three sets of damping truss assemblies evenly distributed along the circumference (1); Each damping truss assembly (1) is an inverted V-shaped structure, including two bases (4), one top seat (2), two support rods (7), two articulated rods A (10), one articulated rod B (5), one articulated rod C (6), and two damping sleeves (3). Each support rod (7) is fitted with a damping sleeve (3) to form a support body. One end of the support body is connected to one base (4) through one articulated rod A (10), and the other end is connected to the top seat (2) through the articulated rod C (6). The other support body is connected to another base (4) through another articulated rod A (10), and the other end is connected to the top seat (2) through the articulated rod B (5). The top seat (2) of each damping truss assembly (1) is bolted to the mounting plane of the reflector, and the two bases (4) are fixed to the mounting plate of the optical assembly. The damping sleeve (3) includes an adapter, a damping layer and a support cylinder. The adapter is fitted on the upper part of the support rod, the damping layer is installed on the lower periphery of the support rod (7), and the support cylinder is fitted on the outside of the damping layer. The support cylinder and the adapter are connected by threads.

2. The high-damping seismic isolation support device for a large-aperture reflector according to claim 1, characterized in that, The height of the damping layer is 5 / 6 of the height of the support rod (7), and the height of the adapter is 1 / 6 of the height of the support rod (7).

3. The high-damping seismic isolation support device for a large-aperture reflector according to claim 1, characterized in that, The damping layer consists of an inner nut, an outer nut, and a damping array (8). The two ends of the damping array (8) are fastened by the inner nut and the outer nut.

4. The high-damping seismic isolation support device for a large-aperture reflector according to claim 3, characterized in that, in, The shock absorption array (8) consists of three groups, located at the upper, middle and lower parts of the shock absorption sleeve (3); Each damping array includes several damping units. Each damping unit includes a base leaf spring (13), a constrained aluminum layer (11), and a damping rubber layer (12). The damping rubber layer (12) is located between the base leaf spring (13) and the constrained aluminum layer (11). Each damping unit has a central hole for mounting on a support rod.

5. A high-damping seismic isolation support device for a large-aperture reflector according to claim 4, characterized in that, The outer circle and center of the base plate spring (13) are provided with protrusions. The protrusions are used to fit the damping rubber layer (12). The damping rubber layer (12) is locked and fixed by the protrusions on the outer circle of the base plate spring (13) and the constrained aluminum layer (11). The protrusion at the center of the base plate spring (13) has a through hole coaxial with the center of the sleeve.

6. The high-damping seismic isolation support device for a large-aperture reflector according to claim 5, characterized in that, The damping adhesive layer (12) has a central hole and three circular holes evenly distributed around the perimeter. There are three arc-shaped gaps between the central hole and the circular holes around the perimeter.

7. The high-damping seismic isolation support device for a large-aperture reflector according to claim 1, characterized in that, The diameter of the supporting optical mirror is ≥Ф1200mm.

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