Fiber bragg grating mounting device for satellite health monitoring and mounting method of fiber bragg grating mounting device

Abstract

The invention discloses a fiber bragg grating installation device for satellite health monitoring and an installation method thereof, and belongs to the technical field of satellite monitoring. The two pre-stretching mechanisms and the two guide mechanisms are arranged on the two sides of the structural member arranged in an array mode respectively, the two guide mechanisms and the two pre-stretching mechanisms are arranged in a one-to-one correspondence mode, each pre-stretching mechanism is fixedly connected with the corresponding end of the corresponding fiber bragg grating, and the two ends of the fiber bragg grating are attached to the corresponding guide mechanisms respectively. The two ends of the fiber bragg grating are fixed and pre-stretched through the pre-stretching mechanism, the fiber bragg grating is simply and conveniently placed at the position where the fiber bragg grating needs to be installed through the guide mechanism, and different pre-stretching multiplying power of the multiple fiber bragg gratings is achieved. The leap-type installation method of the fiber bragg grating is suitable for installation of a multi-point distributed fiber bragg grating sensor on a distributed or large-span special and complex structure, the comprehensiveness and accuracy of monitoring are ensured, and the difficulty of installation and maintenance is reduced.

Description

Technical Field

[0001] The invention relates to a fiber grating installation device for satellite health monitoring and an installation method thereof, belonging to the technical field of satellite monitoring. Background Art

[0002] Satellite array antennas, wing panels, solar panels and other structural parts are very likely to deform after experiencing severe conditions such as large-scale temperature changes, continuous vibrations and space debris impacts during their service in space, which in turn affects their working accuracy and even causes structural damage, posing a major threat to the successful completion of space missions. Therefore, it is particularly important to conduct real-time and accurate health monitoring of satellites and their key structural parts.

[0003] At present, despite significant progress in satellite technology, most satellites and their structural components still lack effective structural health monitoring devices, making it difficult to evaluate and predict their real-time service status.

[0004] The traditional monitoring method that relies on thermistors and strain gauges is limited by its small capacity, heavy weight, and limited monitoring range, and can no longer meet the high requirements of modern satellite structural health monitoring. In contrast, fiber Bragg grating sensing technology has been widely used in aerospace, civil engineering and other fields due to its unique advantages, such as easy distributed networking, excellent anti-electromagnetic interference ability, high sensitivity, good stability, light weight and relatively low cost. This technology can monitor key parameters such as temperature and strain of the structure in real time and accurately, providing strong technical support for structural health assessment.

[0005] However, in the monitoring of distributed or large-span complex structures such as satellite array antennas and wing panels, the existing fiber grating sensor installation methods and devices still have obvious shortcomings. Traditional methods are mostly limited to fixed-point installation of single-point measurement points, or pre-embedded sensors during material preparation, which is difficult to adapt to the installation requirements of these special structures for multi-point distributed fiber grating sensors. This limitation not only limits the comprehensiveness and accuracy of monitoring, but also increases the difficulty of installation and maintenance.

[0006] In view of this, the present invention aims to propose an innovative satellite health monitoring fiber Bragg grating installation device and installation method thereof, so as to effectively solve the installation problem of fiber Bragg grating on complex structural parts such as satellite array antennas, and improve the level and efficiency of satellite structural health monitoring. Summary of the invention

[0007] In order to solve the problems existing in the background technology, the present invention provides a fiber grating installation device for satellite health monitoring and an installation method thereof.

[0008] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fiber grating installation device for satellite health monitoring, including two pre-stretching mechanisms and two guiding mechanisms; the two pre-stretching mechanisms are respectively arranged on both sides of the structural member arranged in the array, and the two guiding mechanisms are respectively arranged on both sides of the structural member arranged in the array, and the two guiding mechanisms are arranged in a one-to-one correspondence with the two pre-stretching mechanisms, each pre-stretching mechanism is respectively fixedly connected to the corresponding end of the corresponding fiber grating, and the two ends of the fiber grating are respectively attached to the corresponding guide mechanism.

[0009] Each of the pre-stretching mechanisms comprises a base plate, a fiber clamping unit and a three-dimensional moving platform; the base plate is fixed with a three-dimensional moving platform, and the fiber clamping unit is fixed with the three-dimensional moving platform.

[0010] The three-dimensional moving platform includes a Y-direction moving platform, an X-direction moving platform and a Z-direction moving platform; the bottom plate is fixedly connected to the fixed end of the Y-direction moving platform, the movable end of the Y-direction moving platform is fixedly connected to the fixed end of the X-direction moving platform, the movable end of the X-direction moving platform is fixedly connected to the fixed end of the Z-direction moving platform, and the movable end of the Z-direction moving platform is fixedly connected to the optical fiber clamping unit.

[0011] The optical fiber clamping unit includes a mounting plate and a clamping assembly, and the clamping assembly includes a lower gasket, an upper gasket and an upper pressure plate; one end of the upper pressure plate is hinged to one end of the mounting plate, and the other end of the upper pressure plate is detachably fixedly connected to the other end of the mounting plate, the upper gasket is fixed to the opposite surface of the upper pressure plate and the mounting plate, and the lower gasket is fixed to the opposite surface of the mounting plate and the upper pressure plate.

[0012] The mounting plate is an L-shaped plate, and the vertical plate and the horizontal plate of the L-shaped plate are both connected with a clamping assembly.

[0013] The guide mechanism comprises a guide plate, a linear guide rail and a guide wheel; a plurality of vertically parallel linear guide rails are arranged on the guide plate, and each of the linear guide rails is respectively connected with a corresponding guide wheel in a sliding and limiting manner.

[0014] The diameter of the guide wheel is determined according to the minimum bending radius of the optical fiber grating.

[0015] The present invention provides a method for installing a fiber grating installation device for satellite health monitoring, the method comprising the following steps:

[0016] S1: Adjust the vertical distance between adjacent guide wheels on the guide mechanism;

[0017] S2: attaching the two ends of the first fiber Bragg grating to the corresponding guide wheels respectively;

[0018] S3: Open the upper pressing plate of the pre-stretching mechanism at the corresponding end;

[0019] S4: applying a pre-stretching force to the first fiber Bragg grating to ensure that the first fiber Bragg grating is in a tensioned state;

[0020] S5: The grating sensor of the first fiber grating is located at the joint of two adjacent structural members;

[0021] S6: placing the corresponding end of the first fiber Bragg grating on the lower gasket of the corresponding end;

[0022] S7: closing the upper pressing plate at the corresponding end and locking it, so that the end of the first fiber grating is pressed between the upper gasket and the lower gasket at the corresponding end;

[0023] S8: bonding and fixing the optical fiber of the first fiber grating to the middle position of the corresponding structural component.

[0024] S9: bonding sleeves at bonding points formed by bonding and fixing the optical fiber of the first fiber grating to the middle position of each structural member;

[0025] S10: sliding the second fiber Bragg grating through all the sleeves in sequence;

[0026] S11: positioning the grating sensor of the second fiber Bragg grating at the joint of two adjacent structural members, and positioning the grating sensor of the second fiber Bragg grating at a different position from the grating sensor of the first fiber Bragg grating;

[0027] S12: Repeat S1-S7 to pre-stretch the second fiber Bragg grating.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The two ends of the fiber Bragg grating of the present invention are fixed and pre-stretched by corresponding pre-stretching mechanisms respectively, and the fiber Bragg grating can be simply and conveniently placed at the position where it needs to be installed through the guiding mechanism, thereby realizing different pre-stretching ratios of multiple fiber Bragg gratings.

[0030] 2. The leap-forward installation method of the fiber Bragg grating of the present invention is suitable for the installation of multi-point distributed fiber Bragg grating sensors on distributed or large-span special and complex structures such as satellite array antennas and wing panels, ensuring the comprehensiveness and accuracy of monitoring and reducing the difficulty of installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the pre-stretching mechanism;

[0032] Figure 2 is a schematic structural diagram of an optical fiber clamping unit;

[0033] Figure 3 It is a structural schematic diagram of the guide mechanism;

[0034] Figure 4 It is a schematic diagram of the working state of the guide mechanism;

[0035] Figure 5 It is a schematic diagram of the working state of the present invention;

[0036] Figure 6 This is a schematic diagram of the installation status of the fiber Bragg grating. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] A fiber grating installation device for satellite health monitoring includes two pre-stretching mechanisms and two guiding mechanisms; the two pre-stretching mechanisms are respectively arranged on both sides of a structural member 11 arranged in an array, and the two guiding mechanisms are respectively arranged on both sides of the structural member 11 arranged in an array, and the two guiding mechanisms are arranged in a one-to-one correspondence with the two pre-stretching mechanisms, each pre-stretching mechanism is respectively fixedly connected to the corresponding end of the corresponding fiber grating, and the two ends of the fiber grating are respectively attached to the corresponding guide mechanism.

[0039] Each of the pre-stretching mechanisms comprises a base plate 1, a fiber clamping unit 5 and a three-dimensional moving platform; the three-dimensional moving platform is fixed on the base plate 1, and the fiber clamping unit 5 is fixed on the three-dimensional moving platform.

[0040] The three-dimensional moving platform includes a Y-direction moving platform 2, an X-direction moving platform 3 and a Z-direction moving platform 4; the base plate 1 is fixedly connected to the fixed end of the Y-direction moving platform 2, the movable end of the Y-direction moving platform 2 is fixedly connected to the fixed end of the X-direction moving platform 3, the movable end of the X-direction moving platform 3 is fixedly connected to the fixed end of the Z-direction moving platform 4, and the movable end of the Z-direction moving platform 4 is fixedly connected to the optical fiber clamping unit 5.

[0041] By moving in three directions of XYZ, the offset position of the fiber grating is adjusted during pre-stretching, and pre-stretching is applied.

[0042] The optical fiber clamping unit 5 includes a mounting plate 5-6 and a clamping assembly, and the clamping assembly includes a lower gasket 5-1, an upper gasket 5-2, and an upper pressure plate 5-4; one end of the upper pressure plate 5-4 is hinged to one end of the mounting plate 5-6 through a rotating shaft 5-5, and the other end of the upper pressure plate 5-4 is detachably fixedly connected to the other end of the mounting plate 5-6 through a locking member 5-3, and the locking member 5-3 is a locking buckle, a snap buckle, etc., which is a prior art and can be purchased externally, so it is not repeated here. The upper gasket 5-2 is fixed to the opposite surface of the upper pressure plate 5-4 and the mounting plate 5-6, and the lower gasket 5-1 is fixed to the opposite surface of the mounting plate 5-6 and the upper pressure plate 5-4.

[0043] The mounting plates 5-6 are L-shaped plates, and the vertical plates and horizontal plates of the L-shaped plates are both connected with clamping assemblies. The L-shaped plates allow the fiber Bragg grating to be compressed in different directions in two planes to adapt to the direction of the fiber Bragg grating during installation.

[0044] The guide mechanism includes a guide plate 6, a linear guide rail 7 and a guide wheel 8; the guide plate 6 is provided with a plurality of vertically parallel linear guide rails 7, each of which is respectively connected to a corresponding guide wheel 8 by sliding and limiting, and the sliding and limiting connection between the pulley and the slide rail belongs to the prior art, so it will not be described in detail. The guide wheel 8 is used for the arrangement and installation of multiple fiber gratings, and the fiber grating can change direction along the guide wheel 8, so as to adapt to the installation and pre-stretching direction of different fiber gratings.

[0045] The diameter of the guide wheel 8 is determined according to the minimum bending radius of the fiber Bragg grating. The guide wheel 8 can be replaced with different diameters to adapt to the minimum bending radius of different fiber Bragg gratings and avoid damage to the fiber Bragg grating.

[0046] The present invention provides a method for installing a fiber grating installation device for satellite health monitoring, the method comprising the following steps:

[0047] S1: adjusting the vertical distance between adjacent guide wheels 8 on the guide mechanism to control the arrangement distance of the fiber grating;

[0048] S2: attaching the two ends of the first fiber Bragg grating to the corresponding guide wheels 8 respectively;

[0049] S3: Open the upper pressing plate 5-4 of the pre-stretching mechanism at the corresponding end;

[0050] S4: applying a pre-stretching force to the first fiber Bragg grating to ensure that the first fiber Bragg grating is in a tensioned state, so as to prevent the fiber Bragg grating from buckling due to thermal expansion and contraction effects in a space environment and thus failing to achieve accurate deformation monitoring;

[0051] S5: The grating sensor 13 of the first fiber grating is located at the joint of two adjacent structural members 11;

[0052] S6: placing the corresponding end of the first fiber grating on the lower gasket 5-1 at the corresponding end;

[0053] S7: Close the upper pressing plate 5-4 at the corresponding end and lock it, so that the end of the first fiber Bragg grating is pressed between the upper gasket 5-2 and the lower gasket 5-1 at the corresponding end, and the upper pressing plate 5-4 and the locking member 5-3 at the corresponding end ensure that the fiber Bragg grating does not slide;

[0054] S8: bonding and fixing the optical fiber 12 of the first fiber grating to the middle position of the corresponding structural component 11 to facilitate the grating sensor 13 to monitor the relative deformation of the two structural components 11.

[0055] S9: The sleeve 15 is bonded to each bonding point 14 formed by bonding and fixing the optical fiber 12 of the first fiber grating to the middle position of each structural member 11;

[0056] S10: sliding the second fiber Bragg grating through all the sleeves 15 in sequence;

[0057] S11: The grating sensor 13 of the second fiber grating is located at the joint of two adjacent structural members 11, and the position of the grating sensor 13 of the second fiber grating is different from that of the grating sensor 13 of the first fiber grating;

[0058] S12: Repeat S1-S7 to pre-stretch the second fiber Bragg grating.

[0059] Different pre-stretching is applied to the two fiber Bragg gratings to meet the requirements of the initial strain of the fiber Bragg grating due to different bonding heights and different temperature change ranges at the antenna positions.

[0060] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fiber grating installation device for satellite health monitoring, characterized in that: It comprises two pre-stretching mechanisms and two guiding mechanisms; the two pre-stretching mechanisms are respectively arranged on both sides of the structure member (11) arranged in an array, and the two guiding mechanisms are respectively arranged on both sides of the structure member (11) arranged in an array, the two guiding mechanisms are arranged in one-to-one correspondence with the two pre-stretching mechanisms, each pre-stretching mechanism is respectively fixedly connected to the corresponding end of the corresponding optical fiber grating, and the two ends of the optical fiber grating are respectively attached to the corresponding guiding mechanism.

2. The fiber grating installation device for satellite health monitoring according to claim 1, characterized in that: Each of the pre-stretching mechanisms comprises a base plate (1), an optical fiber clamping unit (5) and a three-dimensional moving platform; the base plate (1) has a three-dimensional moving platform fixed thereon, and the optical fiber clamping unit (5) is fixed thereon.

3. The fiber grating installation device for satellite health monitoring according to claim 2, characterized in that: The three-dimensional moving platform comprises a Y-direction moving platform (2), an X-direction moving platform (3) and a Z-direction moving platform (4); the base plate (1) is fixedly connected to the fixed end of the Y-direction moving platform (2), the movable end of the Y-direction moving platform (2) is fixedly connected to the fixed end of the X-direction moving platform (3), the movable end of the X-direction moving platform (3) is fixedly connected to the fixed end of the Z-direction moving platform (4), and the movable end of the Z-direction moving platform (4) is fixedly connected to the optical fiber clamping unit (5).

4. The fiber grating installation device for satellite health monitoring according to claim 2, characterized in that: The optical fiber clamping unit (5) comprises a mounting plate (5-6) and a clamping assembly, wherein the clamping assembly comprises a lower gasket (5-1), an upper gasket (5-2) and an upper pressure plate (5-4); one end of the upper pressure plate (5-4) is hinged to one end of the mounting plate (5-6), and the other end of the upper pressure plate (5-4) is detachably fixedly connected to the other end of the mounting plate (5-6); the upper gasket (5-2) is fixed to the opposite surface of the upper pressure plate (5-4) and the mounting plate (5-6), and the lower gasket (5-1) is fixed to the opposite surface of the mounting plate (5-6) and the upper pressure plate (5-4).

5. The fiber grating installation device for satellite health monitoring according to claim 4, characterized in that: The mounting plate (5-6) is an L-shaped plate, and the vertical plate and the horizontal plate of the L-shaped plate are both connected with a clamping assembly.

6. The fiber grating installation device for satellite health monitoring according to claim 1, characterized in that: The guide mechanism comprises a guide plate (6), a linear guide rail (7) and a guide wheel (8); the guide plate (6) is provided with a plurality of linear guide rails (7) arranged vertically in parallel, and each linear guide rail (7) is respectively connected to a corresponding guide wheel (8) in a sliding and limiting manner.

7. The fiber grating installation device for satellite health monitoring according to claim 6, characterized in that: The diameter of the guide wheel (8) is determined according to the minimum bending radius of the optical fiber grating.

8. A method for installing a fiber Bragg grating installation device for satellite health monitoring according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1: adjusting the vertical distance between adjacent guide wheels (8) on the guide mechanism; S2: attaching two ends of the first optical fiber Bragg grating to corresponding guide wheels (8) respectively; S3: Open the upper pressing plate (5-4) of the pre-stretching mechanism at the corresponding end; S4: applying a pre-stretching force to the first fiber Bragg grating to ensure that the first fiber Bragg grating is in a tensioned state; S5: positioning the grating sensor (13) of the first fiber grating at the joint between two adjacent structural members (11); S6: placing the corresponding end of the first fiber grating on the lower gasket (5-1) of the corresponding end; S7: closing the upper pressing plate (5-4) at the corresponding end and locking it, so that the end of the first optical fiber grating is pressed between the upper gasket (5-2) and the lower gasket (5-1) at the corresponding end; S8: bonding and fixing the optical fiber (12) of the first fiber grating to the middle position of the corresponding structural component (11).

9. The method according to claim 8, characterized in that: The method further comprises the steps of: S9: bonding a sleeve (15) at a bonding point (14) formed by bonding and fixing the optical fiber (12) of the first optical fiber grating and the middle position of each structural member (11); S10: sliding the second fiber Bragg grating through all the sleeves (15) in sequence; S11: positioning the grating sensor (13) of the second fiber grating at the joint between two adjacent structural members (11), and the position of the grating sensor (13) of the second fiber grating is different from that of the grating sensor (13) of the first fiber grating; S12: Repeat S1-S7 to pre-stretch the second fiber Bragg grating.

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