CN209945668U - Reflection surface vibration detection device of umbrella-shaped antenna - Google Patents
Reflection surface vibration detection device of umbrella-shaped antenna Download PDFInfo
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- CN209945668U CN209945668U CN201920796495.1U CN201920796495U CN209945668U CN 209945668 U CN209945668 U CN 209945668U CN 201920796495 U CN201920796495 U CN 201920796495U CN 209945668 U CN209945668 U CN 209945668U
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Abstract
The utility model discloses a reflection surface vibration detection device of an umbrella-shaped antenna, which comprises an antenna main body part, a vibration detection part and a driving excitation part; the antenna main body part comprises a rigid satellite antenna and a flexible satellite antenna, and the rigid satellite antenna and the flexible satellite antenna are symmetrically arranged on two sides of the experiment table; the vibration exciter is directly connected with the reflecting surface of the antenna to excite vibration, the projection point on the surface of the flexible board is identified in a non-contact visual detection mode of laser projection, and vibration information of the projection point is collected. The back of the flexible plate is assisted with a laser displacement sensor for synchronous detection, and finally composite vibration information of two detection modes is obtained. And comparing the vibration information of the two experimental objects, and analyzing the vibration difference of the structures of the two experimental objects. And the dynamic forms of the two experimental objects are displayed on a display by using a visual technology, so that the experimental result is more visual.
Description
Technical Field
The utility model relates to a vibration detection area of flexible extension structure in space, concretely relates to reflection surface vibration detection device of umbelliform antenna.
Background
The development of spacecrafts is diversified along with the technological progress, such as solar sails, solar films, communication satellites and the like; these structures are substantially undetachable from the flexible, deployable structure. The flexible expandable structure can realize the deployment of a large-caliber antenna in space, and the antenna is folded on the ground into a small size to be carried on a rocket. The problem that the flexible deployable structure has light weight and small damping, and is easy to excite vibration in space, so that the system is unstable, and particularly, the spacecraft for measurement or communication is greatly influenced, so that the measurement precision is reduced or the communication is unstable. A typical antenna structure used in communication satellites also faces this dilemma. Two large expandable reflectors (LDR) are installed on an engineering test satellite VIII (ETS-VIII), one is used for transmitting signals, and the other is used for receiving signals. The large-caliber antenna reflection surface is easy to generate long-time low-frequency vibration under the action of energy such as cosmic wind, solar thermal load and the like, obviously influences the communication effect between a satellite and the ground, and loses the service life of the satellite, thereby causing economic loss.
The laser displacement sensor is a sensor for measuring by using a laser technology, comprises a laser, a laser detector and a measuring circuit, and is mainly characterized in that physical quantities such as displacement, thickness, diameter, distance, vibration and the like of a measured object can be accurately measured in a non-contact manner. The laser displacement sensor has the advantages that the measuring principle comprises triangulation and echo analysis, the good straightness characteristic is achieved, and the precision is high.
The vibration exciter is an instrument which excites a target object to generate unidirectional or multidirectional vibration by means of being attached to a mechanical structure. At present, the vibration exciters are various in types, and mainly comprise electromagnetic type, electrodynamic type, pneumatic type, hydraulic type and the like. Therefore, the instrument can be used for vibration detection tests of mechanical structures or calibration of sensors and the like.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects and deficiencies of the prior art, the utility model provides a reflection surface vibration detection device of an umbrella-shaped antenna.
The utility model discloses consider that the damping ratio of flexplate is little, the mechanical structure of antenna is complicated, so adopt non-contact detection mode to reduce detection device to the influence of system architecture.
The utility model adopts the following technical scheme:
a reflection surface vibration detection device of an umbrella-shaped antenna comprises an antenna main body part, a vibration detection part and a driving excitation part;
the antenna main body part comprises a rigid satellite antenna and a flexible satellite antenna, and the rigid satellite antenna and the flexible satellite antenna are symmetrically arranged on the experiment table;
the vibration detection part comprises a rigid satellite antenna vibration detection part and a flexible satellite antenna detection part, and the two vibration detection parts have the same structure and respectively comprise a projector, a high-speed camera, a laser displacement sensor, a computer, a laser displacement sensor controller and an A/D acquisition card;
the projector projects a circular light spot to the reflecting surface of the satellite antenna to serve as a mark point, the mark point is in the visual field range of the high-speed camera, and the high-speed camera collects a vibration image containing the mark point and inputs the vibration image into the computer;
the laser displacement sensor detects a back vibration signal of the satellite antenna, and the back vibration signal is sequentially input into the laser displacement sensor controller and the A/D acquisition card and finally input into the computer;
the driving excitation part comprises a signal generator, a power amplifier and a vibration exciter, wherein the signal generator is connected with the power amplifier, and the power amplifier is connected with the vibration exciter and drives the satellite antenna to vibrate.
The rigid satellite antenna and the flexible satellite antenna respectively comprise seven basic units, wherein one basic unit is located on the transverse middle line of the experiment table, the other six basic units surround the basic units to form an umbrella shape, and the angles between the six surrounding basic units and the plane where the center point is located are 10 degrees.
The basic unit of the rigid satellite antenna is composed of a rigid support truss and a flexible plate;
the basic unit of the flexible satellite antenna is composed of a flexible supporting truss and a flexible plate.
The utility model discloses still include sliding guide and hydraulic pressure cloud platform, high-speed camera is installed on the hydraulic pressure cloud platform, and the hydraulic pressure cloud platform slides on sliding guide.
The utility model discloses still include synchronous trigger, the high-speed camera is two, synchronous trigger is connected with two high-speed cameras respectively.
The utility model discloses still include the display, the display is connected with the computer and is used for showing the vibration of rigidity satellite antenna and flexible satellite antenna.
The utility model has the advantages that:
(1) the device adopts a non-contact visual detection means and applies a mode of projecting the mark points by a projector. Compared with a method of pasting mark points, the method does not increase the weight of the original system, does not change the mechanical property of the original system, does not damage the structure of the system, does not change the original natural frequency of the system, and has more accurate measurement result.
(2) The device has the advantages that the marker points are generated by the projector through the laser-induced fluorescence target and then projected to the diffusion light spots on the reflection film, the thickness of the reflection film and the reflection of the reflection film to light are considered, relative to the reflection light spots, the diffusion light spots do not complicate measurement and analysis, and the image contrast is more uniform.
(3) The utility model discloses that the research is the vibration information of antenna reflecting surface, adopts laser displacement sensor to solve the flexible board and is difficult to the difficult problem of installation sensor, and it is strong to have the interference killing feature, advantage that dynamic response is fast.
(4) The utility model discloses utilized visual technique, according to the vibration information of the projection point of reflecting surface, through the three-dimensional demarcation of high-speed camera, the characteristic of identification matching reflecting surface can observe the dynamic form of its vibration in the display.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention;
fig. 2 is a front view of the present invention;
fig. 3 is a side view of the present invention;
fig. 4 is a plan view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Examples
As shown in fig. 1 to 4, a reflection surface vibration detecting apparatus for an umbrella antenna includes an antenna main body portion, a vibration detecting portion, and a drive exciting portion.
The antenna main body part comprises a rigid satellite antenna and a flexible satellite antenna, and the rigid satellite antenna and the flexible satellite antenna are symmetrically arranged on two sides of the experiment table;
the rigid satellite antenna is composed of seven basic units, the seven basic units are identical in structure and respectively comprise a rigid supporting truss 9 and a first flexible board, one basic unit is located in the middle position, the other six basic units surround the basic unit in the middle position, the angle between the planes of the flexible boards of each basic unit is 10 degrees, therefore, the whole antenna structure is concave downwards to form an umbrella shape, and the whole antenna structure formed by assembling the seven basic units is fixed on an experiment table 10 through a right-angle supporting frame.
The flexible satellite antenna is composed of seven basic units, each basic unit is composed of a flexible hinge support frame 16 and a second flexible plate 17, and the structure of the flexible satellite antenna is the same as that of the rigid satellite antenna.
The two groups of experimental objects are respectively arranged on the left side and the right side of the experiment table surface along the neutral surface of the experiment table, the rigid antenna is arranged on the left side, and the flexible truss antenna is arranged on the right side;
the flexible structure is specifically an articulated mechanism, and six groups of articulated mechanisms are distributed along the central column in a radiation manner; one set of hinge mechanisms comprises 7 levers 9 pairs; the rigid structure is a truss structure, and trusses in six directions are extended along the central radiation and are in rigid connection.
The vibration detection part comprises a rigid satellite antenna vibration detection part and a flexible satellite antenna detection part, and the two vibration detection parts have the same structure and respectively comprise a projector, a high-speed camera, a laser displacement sensor, a computer 25, a laser displacement sensor controller and an A/D acquisition card;
in the rigid satellite antenna vibration detection section: including first high-speed camera 1, first projecting apparatus 2, first sliding guide 3, first hydraulic pressure cloud platform 4, first camera fixed plate 5, first laser displacement sensor 12 and first camera mounting bracket 6, synchronous trigger 24.
The first projector is fixed on the camera mounting frame, and under the action of the spectroscope, the phase flexible plate projects a circular light spot, namely a first projection point 8, which is used as a mark point and is basically distributed on the whole antenna reflection surface.
The two first high-speed cameras are respectively fixed on a first hydraulic tripod head through 3/8-inch threaded interfaces, the first hydraulic tripod head is installed on a first sliding guide rail through a bottom threaded hole, and the sliding guide rail is connected with a stainless steel plate with the geometric dimension of 1000mm multiplied by 400mm through a bolt and fixed on a camera installation frame; the pitching angle and the horizontal angle of the high-speed camera are adjusted through a pitching damping knob and a panoramic rotation knob on the hydraulic holder, and the horizontal position of the high-speed camera is adjusted through a sliding guide rail, so that the projection points are ensured to be in the visual field range of visual detection; the two high-speed cameras collect vibration images of the antenna main body at a certain frequency according to the initial coordinates of the space three-dimensional calibration system, and the vibration images are input into a computer through a USB interface to store, process and analyze system vibration parameters such as modal frequency, damping ratio and the like of the flexible plate; and (3) reconstructing an image of the reflecting surface by using a visualization technology and outputting the image on a display, wherein the vibration information of a projection point on the reflecting surface of the antenna is reflected in an important way and the dynamic form change of the reflecting surface is reflected.
The first laser displacement sensor 12 is fixed on the experiment table through a first laser displacement sensor backing plate 13.
The flexible satellite antenna detection part comprises a second projector, a second high-speed camera 22, a second projector, a second sliding guide rail 23, a second hydraulic pan-tilt head 21, a second camera fixing plate 20 and a second camera mounting frame 19.
The second camera mounting frame is located on one side of the flexible satellite antenna, the second high-speed camera is mounted on the second sliding guide rail through the second hydraulic holder, the second sliding guide rail is mounted on the second camera mounting frame through the second camera fixing plate, and the projector is mounted between the two high-speed cameras and projects a second projection point 18 on the flexible plate.
The two second high-speed cameras are respectively a left camera and a right camera, are arranged on the second sliding guide rail in parallel, collect images of the flexible board containing projection points and transmit the images to the computer.
And the computer is connected with the display and is used for displaying the image of the reflecting surface.
The second laser displacement sensor 14 is fixed on the experiment table through a second laser displacement sensor backing plate 15, the laser displacement sensor detects vibration information on the back of the flexible plate, and the vibration information is input into the A/D acquisition card 27 through the laser displacement sensor controller 28 and is further input into the computer.
Each measured object selects four laser displacement sensors to detect the back vibration signal of the flexible plate, the laser displacement sensors are fixed on the table board through connecting base plates, and the design height ensures that the distance between a measuring head of each laser displacement sensor and the back of the measured flexible plate is 80mm of that of the laser displacement sensor.
The driving excitation part comprises a signal generator 30, a power amplifier 29 and a vibration exciter 11, wherein the signal generator is connected with the power amplifier, and the power amplifier is connected with the vibration exciter to drive the vibration of the satellite antenna.
The vibration exciter is directly contacted with a flexible plate of the communication satellite antenna through a mandril; adjusting the power amplifier according to requirements, selecting the frequency of a signal source, and adjusting the output voltage of the signal source to +/-5V (RMS); the vibration exciter is fixed on the table top of the experiment table through a bolt and excites the reflecting surface of the flexible plate of the antenna.
The utility model discloses a non-contact visual detection mode, through projecting apparatus laser projection's mode respectively at first flexbile plate and second flexbile plate surface projection a slice circular shape diffusion facula as the mark point, does not produce any influence to reflecting surface's structure to can reduce reflecting surface's light reflex action, improve the contrast of image.
Each experimental object adopts four laser displacement sensors to acquire vibration signals on the back of the flexible plate, and vibration information on the surface of the flexible plate is detected by a group of binocular high-speed cameras; the vibration signals obtained by the two modes are compared at the same time, so that the composite information obtains more accurate vibration information and form change characteristics of the reflecting surface.
The utility model discloses a working process:
a first step of providing a sine wave signal with certain frequency and amplitude by a signal generator, amplifying the voltage to a driving voltage of a certain degree under the action of a power amplifier, and further driving a vibration exciter to control the vibration of a reflecting surface of a communication satellite antenna;
secondly, a power supply of the projector is switched on, the projector projects uniform circular light spots on the surface of the flexible plate as mark points by laser, the pitching angle and the horizontal angle of the high-speed camera are adjusted by a pitching damping knob and a panoramic rotation knob on the hydraulic holder, the horizontal position of the high-speed camera is adjusted by a sliding guide rail, the field range of the high-speed camera on the left side and the right side is determined, and the high-speed camera groups on the left side and the right side can respectively identify complete antenna reflection surfaces; the binocular high-speed cameras on the same side are subjected to three-dimensional calibration, a space coordinate system is established, the coordinate system is transformed, and initial coordinates of mark points in the camera vision field are matched;
and thirdly, starting a synchronous trigger to enable the left camera group and the right camera group to start to acquire the vibration images at the same time. The high-speed camera collects vibration images of the antenna main body at a certain frequency, the vibration images are input into the computer through the USB interface, curvature information of the reflecting surface is obtained according to vibration displacement of the mark points, and the computer reconstructs the reflecting surfaces of the two structures through a certain algorithm and simultaneously displays the reflecting surfaces on the display screen by applying a visualization technology;
and fourthly, switching on the laser displacement sensor, processing the detected vibration information of the flexible plate by an A/D acquisition card, inputting the processed vibration information into a computer, and forming composite vibration information with the vibration information obtained by visual detection for further analysis.
The experiment table 10 is assembled by three aluminum sectional materials with the sizes of 200mm, 1600mm and 3200mm respectively, the table top plate is a stainless steel plate with the size of 1600mm multiplied by 3200mm multiplied by 8mm, the table top plate is connected with the sectional materials through bolts, and each connecting part of the sectional materials is fixed by angle iron.
The camera mounting frame is assembled by two aluminum sectional materials with the sizes of 1500mm and 1200mm respectively, the two aluminum sectional materials are connected with each other through bolts, and each connecting part of the sectional materials is fixed by angle iron
The high-speed camera 10 is a high-speed camera model FASTCAM SA2, manufactured by photon corporation; 1080 frames/second under the full frame of 2048 × 2048 pixels and 2000 frames/second under the full HD (1920 × 1080 pixels) can be shot; the lens adopts a Nikon AF24mm f/2.8D lens, the focal range is 24mm, the visual angle range is 84 degrees in a 35mm format, and the NikonDX format is 61 degrees. The interface mode is a USB interface.
The first hydraulic pan-tilt 4 and the second hydraulic pan-tilt 21 adopt Fuman diagram company, the model number of which is 500 series MVH500A, the material is aluminum alloy, and the weight can be borne by 5 kg; fixed hydraulic damping is adopted, and hydraulic cabins are assembled on the horizontal shaft and the pitching shaft, so that the camera can be moved smoothly and accurately. The base has an easy-to-use attachment means with an 3/8 inch threaded interface for attachment to the sliding guide. The fast-mounted board has 1/4 inch and 3/8 inch interfaces for connecting the high-speed cameras. The pan-tilt supports panoramic rotation, and the pitch angle is-70 degrees to +90 degrees. First sliding guide 3 and second sliding guide 23 adopt the supporting guide rail of this hydraulic pressure cloud platform, and the material is the metal, and guide rail length is 1m, and fixed bottom hole size is 3/8 hickey.
The projector 2 is a PT-BX431C projector of Panasonic company, and a 1.6-time zoom lens is adopted, so that the size of a projection point 7 on the surface of the flexible plate 1 can be adjusted, and the resolution is 1024 x 768.
The vibration exciter 11 is JZQ-20A, the maximum exciting force is 20kg, the force constant is 14/8, the maximum displacement is 5mm, and the frequency range is 10-2000 Hz. The vibration exciter support is fixed on the ground through a foundation bolt.
The laser displacement sensor 14 adopts a model number LK-081 produced by Keynes corporation, and the reference distance is 80 +/-15 mm; the power supply is 24VDC +/-10%, and the laser displacement sensor controller adopts a matched model number LK-2101.
The signal generator 30 is selected as the model number of Angilent-33220A, the manufacturing unit is Agilent instruments and limited company, and sine wave signals of-15- +15V can be provided; the power amplifier 29 is of a model number YE5872, is purchased from Jiangsu Union energy electronic technology limited and can amplify signals to-120- + 120V; the computer 25 is selected from I500-7255 model, and the manufacture unit is Fangzheng science and technology group, Inc. The display 26 is a lcd display, and has an external size of 21.5 inches, and an optimal resolution of 1920 × 1080.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (6)
1. A reflection surface vibration detection device of an umbrella-shaped antenna is characterized by comprising an antenna main body part, a vibration detection part and a driving excitation part;
the antenna main body part comprises a rigid satellite antenna and a flexible satellite antenna, and the rigid satellite antenna and the flexible satellite antenna are symmetrically arranged on the experiment table;
the vibration detection part comprises a rigid satellite antenna vibration detection part and a flexible satellite antenna detection part, and the two vibration detection parts have the same structure and respectively comprise a projector, a high-speed camera, a laser displacement sensor, a computer, a laser displacement sensor controller and an A/D acquisition card;
the projector projects a circular light spot to the reflecting surface of the satellite antenna to serve as a mark point, the mark point is in the visual field range of the high-speed camera, and the high-speed camera collects a vibration image containing the mark point and inputs the vibration image into the computer;
the laser displacement sensor detects a back vibration signal of the satellite antenna, and the back vibration signal is sequentially input into the laser displacement sensor controller and the A/D acquisition card and finally input into the computer;
the driving excitation part comprises a signal generator, a power amplifier and a vibration exciter, wherein the signal generator is connected with the power amplifier, and the power amplifier is connected with the vibration exciter and drives the satellite antenna to vibrate.
2. The apparatus of claim 1, wherein the rigid satellite antenna and the flexible satellite antenna each comprise seven basic units, one of the basic units is located on a transverse centerline of the experiment table, the other six basic units surround the basic units to form an umbrella shape, and angles between the six surrounding basic units and a plane where the central point is located are 10 degrees.
3. The apparatus of claim 2, wherein the base unit of the rigid satellite antenna is composed of a rigid support truss and a flexible plate;
the basic unit of the flexible satellite antenna is composed of a flexible supporting truss and a flexible plate.
4. The apparatus of claim 1, further comprising a sliding track and a hydraulic pan/tilt head, wherein the high-speed camera is mounted on the hydraulic pan/tilt head, and the hydraulic pan/tilt head slides on the sliding track.
5. The apparatus of claim 1, further comprising two high-speed cameras, wherein the two high-speed cameras are connected to the synchronous triggers respectively.
6. The apparatus of any one of claims 1-5, further comprising a display coupled to the computer for displaying the vibration of the rigid satellite antenna and the flexible satellite antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920796495.1U CN209945668U (en) | 2019-05-29 | 2019-05-29 | Reflection surface vibration detection device of umbrella-shaped antenna |
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| CN201920796495.1U CN209945668U (en) | 2019-05-29 | 2019-05-29 | Reflection surface vibration detection device of umbrella-shaped antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095242A (en) * | 2019-05-29 | 2019-08-06 | 华南理工大学 | A kind of the reflecting surface vibration detection device and method of umbrella antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095242A (en) * | 2019-05-29 | 2019-08-06 | 华南理工大学 | A kind of the reflecting surface vibration detection device and method of umbrella antenna |
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