A large aperture remote sensing camera vertical assembly and test system

Abstract

The present application relates to a kind of super-large caliber remote sensing camera vertical installation and test system, comprising: air floatation isolation device, isolation foundation and tower structure, isolation foundation is overall U-shaped, located below ground surface;Multiple air floatation isolation devices are laid on isolation foundation;Tower structure is connected on the laid isolation foundation, support point is located at the center of gravity position of tower structure;Isolation foundation includes isolation foundation, sand layer, clay layer, sand layer and concrete layer;In isolation foundation, sand layer, clay layer, sand layer and concrete layer are successively laid from bottom to top, to isolate longitudinal vibration wave;Concrete layer is provided with a circle of isolation ditch between isolation foundation, to isolate transverse vibration wave.The present application uses soft sandwich foundation in the isolation foundation part of system, cooperates bidirectional concrete structure, can effectively reduce each direction ground vibration, again with high-damping air floatation isolation device support in the center of gravity position of tower structure, so that the isolation performance of system meets optical detection demand.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of super large caliber remote sensing camera vertical installation and test system, belong to space remote sensing camera technical field. BACKGROUND

[0002] With the pursuit of high resolution of space remote sensor, the caliber of remote sensing camera also increases, when carrying out large caliber remote sensing camera development, due to the influence of product gravity deformation is too large, it is difficult to ensure that the camera installation and adjustment result on the ground is consistent with the state after entering the orbit, traditional optical axis horizontal technical route can no longer meet the development needs. SUMMARY

[0003] The technical problem solved by the present application is to overcome the shortcomings of the prior art, a kind of super large caliber remote sensing camera vertical installation and test system is proposed to solve the problem of high-precision isolation of large-size facilities, meet the vertical installation and detection needs of large caliber remote sensing camera.

[0004] The technical solution of the present application is:

[0005] A kind of super large caliber remote sensing camera vertical installation and test system, including: air floatation isolation device, isolation foundation and tower structure,

[0006] Isolation foundation is U-shaped as a whole, located below ground surface;Multiple air floatation isolation devices are laid on isolation foundation;Tower structure is connected on the laid isolation foundation, and support point is located at the center of gravity position of tower structure;

[0007] Isolation foundation includes isolation foundation, sand layer, clay layer, sand layer and concrete layer;

[0008] Sand layer, clay layer, sand layer and concrete layer are successively laid in isolation foundation from bottom to top to isolate longitudinal vibration wave;A circle of isolation ditch is arranged between concrete layer and isolation foundation to isolate transverse vibration wave;

[0009] The base part of concrete layer is flush with ground surface, and isolation wall protruding from ground surface is arranged above the base part, and air floatation isolation device is fixedly connected on the isolation wall;

[0010] Air floatation isolation device includes cylindrical shell and piston-shaped air bag, and cylindrical shell bottom is fixedly connected on isolation wall;

[0011] Tower structure is multilayer truss structure, and support wing is arranged at both ends of tower structure, support wing is located on the plane where the center of gravity of tower structure is located, and support wing is fixedly connected on the upper end surface of piston rod.

[0012] Further, the vibration speed formula is:

[0013]

[0014] In the formula, is the vibration velocity after isolation, and ξ is the damping ratio of the air floating isolation device, and ω n is the natural frequency of the air floating isolation device, and S is the power spectral density of the environmental vibration source.

[0015] Further, wherein v0 is the vibration velocity, and f0 is the vibration frequency.

[0016] Further, the vibration velocity and frequency reduction ratio of the isolation foundation is not less than 70%, and the maximum vibration source velocity can be reduced to below 30 mu m / s.

[0017] Further, the foundation part of the concrete layer is integrated with the isolation wall.

[0018] Further, the piston-shaped air bag comprises a piston rod and an air bag, and the piston rod is arranged in the air bag to form a closed space.

[0019] Further, the air bag is a flexible body and can tightly adhere to the inner wall of the cylindrical shell after being inflated, and the piston-shaped air bag is arranged in the cylindrical shell.

[0020] Further, a pressure sensor is arranged in the piston-shaped air bag, and a displacement sensor is arranged at the piston to control the height of the piston rod.

[0021] Further, by controlling the volume of the piston-shaped air bag and the bearing area of the piston rod, the natural frequency of the air floating isolation device is not higher than 1 Hz, and the damping ratio is not higher than 10%.

[0022] Further, in the inflated state of the air floating isolation device, the tower structure is lifted and in a suspended state, and there is no structural interference with the isolation foundation, the camera is installed on the tower structure, and after the vibration attenuation of the isolation foundation and the air floating isolation device twice, the vibration velocity finally conducted to the tower structure is less than 3.12 mu m / s.

[0023] Further, initially, the air floating isolation device is in an uninflated state, at this time, the bottom layer of the tower structure is flush with the ground; after the camera is placed on the tower structure, the air floating isolation device is inflated, the bottom layer of the tower structure is away from the ground and in a suspended state, and the camera related test work is carried out, thereby reducing the interference of vibration on the test results in the test process.

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

[0025] The present application adopts a soft interlayer foundation combined with a bidirectional concrete structure in the isolation foundation part of the system, can effectively reduce the vibration of the ground source in all directions, and further supports the gravity center position of the tower structure with a high-damping air floating isolation device, so that the vibration velocity of the vibration source can be reduced by more than one time, and the system isolation performance can meet the optical detection requirements. Attached Figure Description

[0026] Figure 1 This is a system composition diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the seismic isolation foundation structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the tower structure of the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments.

[0030] A vertical mounting and testing system for an ultra-large aperture remote sensing camera, such as Figure 1 As shown, it includes: an air-floating seismic isolation device 1, a seismic isolation foundation 2, and a tower structure 3.

[0031] The seismic isolation foundation 2 is U-shaped and located below the ground surface; multiple air-floating seismic isolation devices 1 are laid flat on the seismic isolation foundation 2; the tower structure 3 is connected to the flat seismic isolation foundation 2, and the support point is located at the center of gravity of the tower structure 3.

[0032] like Figure 2 As shown, the seismic isolation foundation 2 includes a seismic isolation foundation, a sand layer, a clay layer, a sand layer, and a concrete layer;

[0033] In the seismic isolation foundation, a layer of sand, a layer of clay, another layer of sand, and a layer of concrete are laid from bottom to top to isolate longitudinal seismic waves; a seismic isolation trench is set between the concrete layer and the seismic isolation foundation 2 to isolate transverse seismic waves; the seismic isolation foundation reduces the velocity and frequency of vibration by no less than 70%, and can reduce the maximum vibration source velocity to below 30μm / s;

[0034] The foundation of the concrete layer is flush with the ground surface. A seismic isolation wall protruding above the foundation is set up, and an air-floating seismic isolation device 1 is fixedly connected to the seismic isolation wall. The foundation of the concrete layer and the seismic isolation wall are an integral structure.

[0035] The air-floating vibration isolation device includes a cylindrical shell and a piston-shaped airbag. The piston-shaped airbag includes a piston rod and an airbag. The piston rod is placed in the airbag to form a sealed space. The airbag is a flexible body that can fit tightly against the inner wall of the cylindrical shell after inflation. A pressure sensor is installed in the piston-shaped airbag, and a displacement sensor is installed at the piston to control the height of the piston rod. By controlling the volume of the piston-shaped airbag and the bearing area of ​​the piston rod, the natural frequency of the air-floating vibration isolation device is not higher than 1Hz, and the damping ratio is not higher than 10%. The bottom of the cylindrical shell is fixedly connected to the vibration isolation wall.

[0036] like Figure 3As shown, the tower structure 3 is a multi-layer truss structure, support wings are arranged at both ends of the tower structure 3, the support wings are located on a plane where the center of gravity of the tower structure 3 is located, and the support wings are fixedly connected to the upper end surface of the piston rod; in the inflated state of the air floating vibration isolation device, the tower structure 3 is lifted and in a suspended state, and there is no structural interference with the vibration isolation foundation 2, the camera is installed on the tower structure 3, and after twice vibration attenuation of the vibration isolation foundation 2 and the air floating vibration isolation device, the vibration speed finally conducted to the tower structure 3 is less than 3.12 μm / s.

[0037] The total load capacity of the tower structure is 100 t, wherein the load capacity of the bottom layer is 50 t, the load capacity of the top layer is 20 t, and the load capacity of each intermediate layer is 10 t, and the overall fundamental frequency of the structure is 15 Hz, which meets the test requirements of the remote sensor.

[0038] In order to ensure the overall vibration isolation effect of the system, a middle support form is adopted. The middle vibration isolation support scheme arranges the support position of the vibration isolation system near the mass center height of the detection tower in the design, effectively solves the problems of high mass center position of the vertical installation and adjustment device itself, poor stability of the tower body and the load above, and ensures the vibration isolation performance of the overall system.

[0039] Initially, the air floating vibration isolation device is in an un-inflated state, at this time, the bottom layer of the tower structure 3 is flush with the ground; after the camera is placed on the tower structure 3, the air floating vibration isolation device is inflated, the bottom layer of the tower structure 3 is away from the ground and in a suspended state, and the camera related test work is carried out, thereby reducing the interference of vibration on the test results in the test process.

[0040] The vibration speed formula is:

[0041]

[0042] In the formula, v is the vibration speed, ξ is the damping ratio of the air floating vibration isolation device, ω is the vibration speed after vibration isolation, ξ is the damping ratio of the air floating vibration isolation device, ω n is the natural frequency of the air floating vibration isolation device, and S is the power spectral density of the environmental vibration source.

[0043] In the formula, v0 is the vibration speed, and f0 is the vibration frequency.

[0044] In order to meet the needs of large-aperture remote sensing camera installation and adjustment and optical detection, the application designs a system which can meet the needs of remote sensing camera installation and test with an outer contour size less than 10m*10m*14m and a weight less than 100t. The system mainly comprises a vibration isolation foundation, a tower structure and an air floating device, the overall bearing capacity of the system can reach 100t, and the overall vibration isolation performance of the structure can meet the E-level requirements of the internationally common vibration isolation system micro-vibration design and evaluation criterion IEST:VC (Vibration Criteria) standard, thereby meeting the vibration isolation needs of optical system detection.

[0045] The system mainly breaks through two technical difficulties: ① the optical level isolation standard of 10m order of magnitude super large size device is achieved; ② the full-process function and stability requirement of super large aperture remote sensing camera assembly and testing link is realized. The design result shows that the system has the characteristics of: ① good isolation performance; ② good stability; ③ wide application range, etc. The micro-vibration interference problem of super large aperture remote sensing camera assembly and testing link can be well solved.

[0046] The large aperture high-precision remote sensing camera carried by a remote sensing satellite is mainly used for space photography and earth monitoring, and the aperture size of the camera and its mirror directly affects the picture shooting quality. The traditional optical testing of the remote sensing camera mainly adopts the horizontal state of the optical axis, and the implementation is to build and measure the horizontal light path on the optical isolation platform. With the increase of the mirror aperture, the error caused by the gravity factor when the optical axis is tested horizontally increases, especially when the large aperture optical system is tested, the influencing factors are more complex. In order to avoid the interference of the gravity factor, it is particularly necessary to adopt the vertical assembly and detection mode for the super large aperture mirror and the remote sensing camera.

[0047] The system provides a stable testing environment for the vertical assembly and detection of the remote sensing camera. The overall isolation performance of the tower structure and the isolation system used in combination can meet the optical testing requirements, and can realize the functions of face type detection of the super large size mirror assembly in the vertical state of the optical axis, vertical assembly of the camera, and vertical detection of the lens.

[0048] The soft interlayer foundation is matched with the bidirectional concrete structure in the isolation foundation part of the system, which can effectively reduce the vibration of the ground source in all directions. In addition, the high-damping air floating isolation device is supported at the gravity center position of the tower structure, which can reduce the vibration speed of the vibration source by more than one time, so that the isolation performance of the system meets the optical detection requirements.

[0049] Although the present application has been disclosed with reference to the preferred embodiments as above, 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, belongs to the protection scope of the technical solutions of the present application.

Claims

1. A large aperture remote sensing camera vertical assembly and test system, comprising: The utility model relates to a kind of air floatation vibration isolation device, air floatation vibration isolation device, vibration isolation foundation and tower structure. The vibration isolation foundation (2) includes a vibration isolation foundation, a first sand layer, a clay layer, a second sand layer and a concrete layer. The vibration isolation foundation is in the shape of U and is located below the ground surface. The first sand layer, the clay layer, the second sand layer and the concrete layer are sequentially laid in the vibration isolation foundation from bottom to top to isolate longitudinal vibration waves. The concrete layer is flush with the ground surface. The air floatation vibration isolation device includes a cylindrical shell and a piston-shaped air bag. The piston-shaped air bag is located in the cylindrical shell. The tower structure (3) is a multi-layer truss structure. The vibration speed formula is:

2. The system according to claim 1, wherein, The vibration isolation foundation can reduce the vibration speed and frequency by no less than 70%, and can reduce the maximum vibration speed to less than 30 μm / s. In the formula, is the vibration velocity after the vibration isolation, ξ is the damping ratio of the air floating vibration isolation device, ω n is the natural frequency of the air floating vibration isolation device, and S is the power spectral density of the environmental vibration source.

3. The system of claim 1, wherein, The concrete layer and the vibration isolation wall are an integral structure.

4. The system of claim 1, wherein, A pressure sensor is arranged in the piston-shaped air bag, and a displacement sensor is arranged at the piston to control the height of the piston rod.

5. The large aperture remote sensing camera vertical assembly and test system of claim 1, wherein, The natural frequency of the air floatation vibration isolation device is no more than 1 Hz, and the damping ratio is no more than 10% by controlling the volume of the piston-shaped air bag and the bearing area of the piston rod.

6. The system according to claim 5, wherein, When the air floatation vibration isolation device is inflated, the tower structure (3) is lifted and in a suspended state, and there is no structural interference with the vibration isolation foundation (2).

7. The system of claim 1, wherein, The camera is installed on the tower structure (3), and the vibration speed transmitted to the tower structure (3) after twice vibration attenuation of the vibration isolation foundation (2) and the air floatation vibration isolation device is less than 3.12 μm / s.

8. The system of claim 1, wherein, Initially, the air floatation vibration isolation device is in an uninflated state, and the bottom layer of the tower structure (3) is flush with the ground surface. After the camera is placed on the tower structure (3), the air floatation vibration isolation device is inflated, the bottom layer of the tower structure (3) is separated from the ground surface, the tower structure (3) is in a suspended state, and camera-related test work is performed to reduce the interference of vibration on the test results during the test process.

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