CN110095242A - A kind of the reflecting surface vibration detection device and method of umbrella antenna - Google Patents
A kind of the reflecting surface vibration detection device and method of umbrella antenna Download PDFInfo
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- CN110095242A CN110095242A CN201910455625.XA CN201910455625A CN110095242A CN 110095242 A CN110095242 A CN 110095242A CN 201910455625 A CN201910455625 A CN 201910455625A CN 110095242 A CN110095242 A CN 110095242A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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Abstract
The invention discloses the reflecting surface vibration detection devices and method of a kind of umbrella antenna, including antenna body part, vibration detecting part and driving driver unit；The antenna body part includes rigid satellite antenna and flexible satellite antenna, and rigid satellite antenna and flexible satellite antenna are symmetricly set on the two sides of experimental bench；Vibration excitor is directly connected to the reflecting surface excited vibration of antenna, and the subpoint of flexible plate surface, the vibration information of acquired projections point are identified using the non-contact vision detection mode of laser projection.The back side of flexible board is aided with the synchronous detection of laser displacement sensor, finally obtains the complex vibration information of two-way detection mode.Compare the vibration information of two experimental subjects, the vibration difference of both analyses structure.Reference visualization technique shows that the dynamic form of two experimental subjects, experimental result are more intuitive in display.
Description
Technical field
The present invention relates to the vibration detection fields of spatial flexible stretched out structure, and in particular to a kind of reflection table of umbrella antenna
Surface vibration detection device and method.
Background technique
The development of spacecraft becomes varied with advances in technology, such as solar sail, solar energy film, telecommunication satellite
Deng；These structures are substantially be unableing to do without flexible deployable structure.Flexible deployable structure may be implemented in too aerial deployment heavy caliber
Antenna is collapsed into small size on the ground and is mounted on rocket.Accompanying problem is that flexible deployable structure light weight, damping
It is small, it is easily ignited vibration in space, causes the unstable of system, especially to for measuring or the spacecraft of telecommunications use is made
At extreme influence, measurement accuracy is caused to reduce or communicate unstable.A kind of typical antenna structure is applied in telecommunication satellite
On also face this predicament.Be mounted on engineering test satellite VIII (ETS- VIII) two large sizes can extensor reflex device (LDR), a use
In transmitting signal, another is for receiving signal.This bigbore antenna-reflected surface is in energy such as universe wind, sun thermal forces
Under the action of amount, it is easy to happen prolonged low-frequency vibration, it is clear that influence whether communication efficiency between satellite and ground, and damage
In the service life for consuming satellite, cause economic damages.
Laser displacement sensor is the sensor measured using laser technology, its composition includes laser, laser
Detector and measuring circuit, being mainly characterized by being capable of the non-contactly displacement of precise measurement measured object, thickness, diameter, distance, vibration
The physical quantitys such as dynamic.Laser displacement sensor measuring principle includes triangulation and two kinds of echo analysis, has good straightness
Characteristic and precision is higher.
Vibration excitor is the mode by being attached in mechanical structure, and incentives target object generates unidirectional or multidirectional vibration
Instrument.The wide variety of vibration excitor at present mainly includes electromagnetic type, electrodynamic type, pneumatic type and fluid pressure type etc..Therefore, the instrument
Device can be used for the applications such as vibration detection test or the calibration of sensor of mechanical structure.
Summary of the invention
In order to overcome shortcoming and deficiency of the existing technology, the present invention provides a kind of reflecting surface vibration of umbrella antenna
Detection device and method.
The present invention is small in view of the damping ratio of flexible board, the complicated in mechanical structure of antenna, therefore uses non-contact detection side
Formula reduces influence of the detection device to system structure.
The present invention adopts the following technical scheme:
A kind of reflecting surface vibration detection device of umbrella antenna, including antenna body part, vibration detecting part and drive
Dynamic driver unit；
The antenna body part includes rigid satellite antenna and flexible satellite antenna, rigid satellite antenna and flexible satellite
Antenna symmetry is arranged on experimental bench；
The vibration detecting part includes rigid satellite antenna vibration detecting part and flexible satellite antenna detection part, and two
A vibration detecting part separation structure is identical, includes projector, high speed camera, laser displacement sensor, computer, laser displacement biography
Sensor controller and A/D capture card；
The projector is to the reflecting surface of satellite antenna projection circular light spot as index point, and index point is in high speed camera
Within sweep of the eye, the high speed camera acquisition inputs computer comprising the vibrational image of index point；
The back side vibration signal of the laser displacement sensor detection satellite antenna, sequentially inputs laser displacement sensor control
Device and A/D capture card processed, recently enters computer；
The driving driver unit includes signal generator, power amplifier and vibration excitor, the signal generator and function
Rate amplifier connection, the power amplifier are connect with vibration excitor, drive the vibration of satellite antenna.
The rigidity satellite antenna and flexible satellite antenna include seven basic units, and one of basic unit is located at
In the transversal centerline of experimental bench, other six basic units, which are looped around around it, constitutes umbrella shape, and six for being looped around surrounding are basic
Angle where unit and central point between plane is 10 degree.
The basic unit of the rigidity satellite antenna is made of rigid support truss and flexible board；
The basic unit of flexible satellite antenna is made of flexible support truss and flexible board.
The invention also includes slide rail and fluid head, the high speed camera is mounted on fluid head, fluid head
It is slided on slide rail.
The invention also includes synchronizer trigger, the high speed camera be two, the synchronizer trigger respectively with two height
Fast camera connection.
The invention also includes display, the display is connect for showing that rigid satellite antenna and flexibility are defended with computer
The vibration of star antenna.
A kind of method of the reflecting surface vibration detection device of umbrella antenna, includes the following steps:
First step signal generator provides the sine wave signal of preset frequency and amplitude, in the work of power amplifier
With lower by voltage amplification, and then drive the reflecting surface vibration of vibration excitor control communication satellite antenna；
The uniform circular light spot of second step projector laser projection, as index point, starts two cameras in flexible plate surface
The vibrational image for starting simultaneously at acquisition flexible board inputs computer by USB interface, is obtained instead according to the vibration displacement of index point
Reflective surface curvature information shows the vibration information of two antennas over the display；
The vibration information for the flexible board that third step laser displacement sensor will test, it is defeated after the processing of A/D capture card
Enter computer, and the vibration information obtained with vision-based detection forms compound vibration information into analysis.
Beneficial effects of the present invention:
(1) present apparatus uses non-contact vision detection means, using the mode of projector index point.Compared to stickup
The mode of index point, does not increase original system weight, does not change its mechanical property, will not destroy system structure, and system is former intrinsic
Frequency does not change, and the measurement result of this means is more accurate.
(2) index point of the present apparatus is generated by projector by laser induced fluorescence target and then is projected on reflective film
Diffuse hot spot, it is contemplated that reflection of the thickness and reflective film of reflective film to light itself, relative to flare, diffused light
Spot will not be such that measurement analysis complicates, and picture contrast is more uniform.
(3) what the present invention studied is the vibration information on antenna-reflected surface, solves flexibility using laser displacement sensor
Plate is difficult to install the problem of sensor, has strong antijamming capability, the fast advantage of dynamic response.
(4) present invention has used visualization technique, according to the vibration information of the subpoint of reflecting surface, passes through high speed camera
Stereo calibration, the feature of identification matching reflecting surface, can be observed the dynamic form of its vibration in the display.
Detailed description of the invention
Fig. 1 is general structure schematic diagram of the invention；
Fig. 2 is main view of the invention；
Fig. 3 is side view of the invention；
Fig. 4 is top view of the invention；
Fig. 5 is process chart of the invention.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As Figure 1-Figure 4, the reflecting surface vibration detection device of a kind of umbrella antenna, device part include antenna master
Body portion, vibration detecting part and driving driver unit.
The antenna body part includes rigid satellite antenna and flexible satellite antenna, rigid satellite antenna and flexible satellite
The two sides of experimental bench are arranged in antenna symmetry；
The rigidity satellite antenna is made of seven basic units, and seven basic cell structures are identical, includes rigidity branch
Truss 9 and the first flexible board are supportted, a basic unit is centrally located, other six basic units are looped around middle position
Around basic unit, the angle where the flexible board of each basic unit between plane is 10 degree, therefore whole antenna structure is
Recessed, umbrella is constituted, experiment is fixed on by right angle support frame by seven basic units assembled overall antenna structure
On platform 10.
The flexibility satellite antenna is made of seven basic units, and each basic unit is by flexible hinge support frame 16 and the
Two flexible boards 17 are constituted, other are identical as rigid satellite antenna structure.
Two groups of experimental subjects are split along the neutral surface of experimental bench in the left and right sides of experiment table top, and left side is rigid day
Line, right side are flexible truss antennas；
The flexible structure is specially linkage, and six groups of linkages are along newel radiation profiles；One group of linkage
It is secondary comprising 7 bar 9；Rigid structure is specially truss structure, and along the truss of center radiation extension six direction, the truss is using rigidity
Connection.
The vibration detecting part includes rigid satellite antenna vibration detecting part and flexible satellite antenna detection part, and two
A vibration detecting part separation structure is identical, includes projector, high speed camera, laser displacement sensor, computer 25, laser displacement
Sensor controller and A/D capture card；
In the rigidity satellite antenna vibration detecting part: being slided including the first high speed camera 1, the first projector 2, first
It is guide rail 3, the first fluid head 4, first camera fixed plate 5, first laser displacement sensor 12 and first camera mounting rack 6, same
Walk trigger 24.
First projector is fixed in camera mounting bracket, and under spectroscope effect, phase flexible board projects a piece of circle
Hot spot i.e. the first subpoint 8 is used as index point, is covered with entire antenna-reflected surface substantially.
There are two first high speed cameras, and respectively left and right camera is fixed on the first liquid by 3/8 Inches Thread interface
It presses on holder, first fluid head is mounted on the first slide rail by bottom thread hole, and slide rail is bolted
The stainless steel plate that one piece of geometric dimension is 1000mm × 400mm, is fixed in camera mounting bracket；Pass through the pitching on fluid head
The pitch angle and level angle for damping knob and panorama rotation knob adjustment high speed camera, adjust high speed phase by slide rail
The horizontal position of machine, it is ensured that subpoint vision-based detection within sweep of the eye；Two high speed cameras are demarcated according to space multistory
System initial coordinate is saved and is located by USB interface input computer with the vibrational image of certain frequency collection antenna body
The modal frequency of reason analysis flexible board, the equal system vibrations parameter of damping ratio；Using the figure of visualization technique reconstruct reflecting surface
Over the display as output, the vibration information of subpoint and reflect the dynamic shape of reflecting surface on emphasis reflection antenna-reflected surface
State variation.
The first laser displacement sensor 12 is fixed on experimental bench by first laser displacement sensor backing plate 13.
The flexibility satellite antenna detection part includes the second projector, the second high speed camera 22, the second projector, second
Slide rail 23, the second fluid head 21, second camera fixed plate 20 and second camera mounting rack 19.
The second camera mounting rack is located at the side of flexible satellite antenna, and the second high speed camera passes through the second fluid head
It is mounted on the second slide rail, the second slide rail is mounted on second camera mounting rack by second camera fixed plate, is thrown
Shadow instrument, which is mounted between two high speed cameras, projects the second incident point 18 on flexible board.
Second high speed camera is two, respectively left and right camera, is arranged in parallel on the second slide rail, acquisition packet
Flexible board image containing subpoint, is transmitted to computer.
It further include display, the computer is connect with display, for showing the image of reflecting surface.
Second laser displacement sensor 14 is fixed on experimental bench by second laser displacement sensor backing plate 15, laser position
Displacement sensor detects the vibration information of flexible back, by laser displacement sensor controller 28, input A/D capture card 27 into
One step inputs computer.
Each measurand selects the back side vibration signal of four laser displacement sensor detection flexible boards, laser displacement
Sensor is fixed on table top by connection backing plate, and design height guarantees the gauge head and tested flexible backboard of laser displacement sensor
The distance in face is the distance 80mm of laser displacement sensor.
Driving driver unit includes signal generator 30, power amplifier 29 and vibration excitor 11, the signal generator with
Power amplifier connection, the power amplifier are connect with vibration excitor, drive the vibration of satellite antenna.
Vibration excitor is directly contacted by the flexible board of mandril and communication satellite antenna；Regulation power amplifier as required, choosing
Signal source frequency is selected, signal source output voltage is transferred to ± 5V (RMS)；Vibration excitor is bolted on laboratory bench top,
Excitation is generated to the reflecting surface of the flexible board of antenna.
The present invention uses non-contact vision detection mode, respectively in the first flexibility by way of projector laser projection
Plate and the second flexible plate surface project a piece of circular diffusion hot spot as index point, do not generate to the structure of reflecting surface any
It influences, and the light reflex of reflecting surface can be reduced, improve the contrast of image.
Each experimental subjects acquires the vibration signal of flexible back, flexible plate surface using four laser displacement sensors
Vibration information pass through the detection of one group of binocular high speed camera；It the vibration signal that is obtained by both modes while comparing, it is thus multiple
It closes information and obtains the vibration information and morphological change characteristics of more accurate reflecting surface.
As shown in figure 5, the course of work of the invention:
First step signal generator provides the sine wave signal of certain frequency and amplitude, will under the action of power amplifier
The driving voltage of voltage amplification to a certain extent, and then drive the reflecting surface vibration of vibration excitor control communication satellite antenna；
Second step connects the power supply of projector, and the uniform circular light spot of projector laser projection is in flexible plate surface as mark
Will point passes through the pitch angle and horizontal angle of damping in pitch knob and panorama rotation knob adjustment high speed camera on fluid head
Degree adjusts the horizontal position of high speed camera by slide rail, determines the field range of left and right sides high speed camera, guarantees left and right
Two sides high speed camera group can identify complete respective antenna-reflected surface respectively；Ipsilateral binocular high speed camera solid mark
It is fixed, establish space coordinates, coordinate system transformation, the index point initial coordinate in the matching camera visual field；
Third step starts synchronizer trigger, and left and right phase unit is made to start simultaneously at acquisition vibrational image.High speed camera is with certain
Frequency collection antenna body vibrational image, by USB interface input computer, obtained instead according to the vibration displacement of index point
Reflective surface curvature information, computer reconstruct the reflecting surface of two structures by certain algorithm and apply visualization technique simultaneously
Display is on a display screen；
4th step connects laser displacement sensor, and the vibration information for the flexible board that will test is handled by A/D capture card
Afterwards, computer is inputted, and the vibration information obtained with vision-based detection forms compound vibration information into analysis.
Experimental bench 10 is assembled by the aluminium section that three kinds of sizes are respectively 200mm, 1600mm, 3200mm, deck plate
It is one piece of 1600mm × 3200mm × 8mm stainless steel plate, is coupled by bolt with profile, there is angle in each connection place of profile
Ferropexy.
Camera mounting bracket is respectively 1500mm by two kinds of sizes, and the aluminium section of 1200mm assembles, and passes through bolt
Couple with profile, each connection place of profile has angle bar to fix
High speed camera 10 is manufactured using the high speed camera of FASTCAM SA2 model by Photron company；It can shoot
1080 frames/second under 2048 × 2048 pixel of full frame, full HD (1920 × 1080 pixel) 2000 frames/second；Camera lens uses Nikon AF
24mm f/2.8D camera lens, focal range 24mm, angular field of view are 84 degree in 35mm format, and NikonDX format is 61 degree.Interface
Mode is USB interface.
First fluid head 4 and the second fluid head 21 use Fu Mantu company model for 500 series MVH500A models,
Material is aluminium alloy, can load-bearing 5kg；It is damped using fixed hydraulic, is equipped with hydraulic compartment on horizontal and pitch axis, it is ensured that
The gliding smoothing of camera is accurate.Pedestal has the easy-to-use attachment device of a 3/8 Inches Thread interface, can be used to and slide rail
Connection.Quick-mounting board connects high speed camera with 3/8 inch of interface with 1/4 inch.Holder support panorama rotation, pitch angle be-
It spends for 70 degree to+90.First slide rail 3 and the second slide rail 23 use the mating guide rail of the fluid head, and material is metal, is led
Rail length is 1m, and fixed bottom outlet size is 3/8 hickey.
Projector 2 selects the PT-BX431C projector of Panasonic Corporation, using 1.6 times of zoom lens, adjustable flexible plate 1
The size of the subpoint 7 on surface, resolution ratio are 1024 × 768.
Vibration excitor 11 select model JZQ-20A, maximum exciting force be 20kg, force constant 14/8, maximum displacement 5mm,
Frequency range 10-2000Hz.It is fixed on the ground by vibration excitor support with foundation bolt.
For laser displacement sensor 14 using the model LK-081 of Keyemce company production, reference distance is 80 ± 15mm；
Power supply is 24VDC ± 10%, and laser displacement sensor controller uses matched model LK-2101.
Signal generator 30 selects model Angilent-33220A, and manufacturer is Agilent Instrument Ltd., can
With the sine wave signal of offer -15-+15V；Power amplifier 29 selects model YE5872, and Congjiang Soviet Union energy-electronics technology has
Limit company buys, and signal can be amplified to -120-+120V；Computer 25 selects I500-7255 model, and manufacturer is side
Positive science and technology Group Plc.Display 26 is 21.5 inches of apparent size, best to differentiate using the special peace liquid crystal display of letter
Rate is 1920 × 1080.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of reflecting surface vibration detection device of umbrella antenna, which is characterized in that including antenna body part, vibration detection
Part and driving driver unit；
The antenna body part includes rigid satellite antenna and flexible satellite antenna, rigid satellite antenna and flexible satellite antenna
It is symmetricly set on experimental bench；
The vibration detecting part includes rigid satellite antenna vibration detecting part and flexible satellite antenna detection part, two vibrations
Dynamic detection part structure is identical, includes projector, high speed camera, laser displacement sensor, computer, laser displacement sensor
Controller and A/D capture card；
The projector is to the reflecting surface of satellite antenna projection circular light spot as index point, view of the index point in high speed camera
In wild range, the high speed camera acquisition inputs computer comprising the vibrational image of index point；
The back side vibration signal of the laser displacement sensor detection satellite antenna, sequentially inputs laser displacement sensor controller
And A/D capture card, recently enter computer；
The driving driver unit includes signal generator, power amplifier and vibration excitor, and the signal generator is put with power
Big device connection, the power amplifier are connect with vibration excitor, drive the vibration of satellite antenna.
2. a kind of reflecting surface vibration detection device of umbrella antenna according to claim 1, which is characterized in that described rigid
Property satellite antenna and flexible satellite antenna include seven basic units, one of basic unit is located in the transverse direction of experimental bench
On line, other six basic units, which are looped around around it, constitutes umbrella shape, is looped around six basic units and the central point institute of surrounding
Angle between plane is 10 degree.
3. a kind of reflecting surface vibration detection device of umbrella antenna according to claim 2, which is characterized in that rigidity is defended
The basic unit of star antenna is made of rigid support truss and flexible board；
The basic unit of flexible satellite antenna is made of flexible support truss and flexible board.
4. a kind of reflecting surface vibration detection device of umbrella antenna according to claim 1, which is characterized in that further include
Slide rail and fluid head, the high speed camera are mounted on fluid head, and fluid head slides on slide rail.
5. a kind of reflecting surface vibration detection device of umbrella antenna according to claim 1, which is characterized in that further include
Synchronizer trigger, the high speed camera are two, and the synchronizer trigger is connect with two high speed cameras respectively.
6. a kind of reflecting surface vibration detection device of umbrella antenna according to claim 1-5, feature exist
In further including display, the display connect the vibration for showing rigid satellite antenna and flexible satellite antenna with computer
It is dynamic.
7. a kind of method of the reflecting surface vibration detection device of umbrella antenna according to claim 1-6,
It is characterized in that, includes the following steps:
First step signal generator provides the sine wave signal of preset frequency and amplitude, under the action of power amplifier
By voltage amplification, and then drive the reflecting surface vibration of vibration excitor control communication satellite antenna；
The uniform circular light spot of second step projector laser projection, as index point, starts two cameras simultaneously in flexible plate surface
The vibrational image for starting to acquire flexible board obtains reflection table according to the vibration displacement of index point by USB interface input computer
Face curvature information shows the vibration information of two antennas over the display；
The vibration information for the flexible board that third step laser displacement sensor will test, after the processing of A/D capture card, input meter
Calculation machine, and the vibration information obtained with vision-based detection forms compound vibration information into analysis.
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| CN201910455625.XA CN110095242A (en) | 2019-05-29 | 2019-05-29 | A kind of the reflecting surface vibration detection device and method of umbrella antenna |
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