CN208383291U - A kind of vibration detection device of truss support circular membrane structure - Google Patents
A kind of vibration detection device of truss support circular membrane structure Download PDFInfo
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- CN208383291U CN208383291U CN201820978550.4U CN201820978550U CN208383291U CN 208383291 U CN208383291 U CN 208383291U CN 201820978550 U CN201820978550 U CN 201820978550U CN 208383291 U CN208383291 U CN 208383291U
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- vibration
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Abstract
The utility model discloses a kind of vibration detection devices of truss support circular membrane structure, including film bulk and excitation detection part；The film bulk includes disc type film, support plate and flexible truss, and the excitation detection part includes two high speed cameras, laser, vibration excitor, computer, signal generator and power amplifier.The vibration detection device of the utility model is made of binocular vision system, can be carried out non-contact measurement to measurement ontology, appendix effect will not be brought to system, so that the strong robustness of system, obtains the more accurate vibration information of disc type membrane structure.
Description
Technical field
The utility model relates to flexible structure vibration measurement fields, and in particular to a kind of vibration of truss support circular membrane structure
Motion detection device.
Background technique
Since 21st century, the complexity for the task that spacecraft is undertaken is continuously increased, requirement of the people to its structure
It is higher and higher, it on the one hand requires to improve bearing capacity, on the one hand requires the gross mass for reducing structure, therefore, spacecraft is towards low
Rigidity, flexibility, enlargement trend development, the big flexible big feature for becoming modern spacecraft.Flexible structure is widely present
In spacecraft, such as the solar energy sailboard structure of satellite or space work station, space flight wing, space station flexible mechanical arm, large size
Parabola antenna etc., from its structure feature, the spacecraft with flexible structure can be divided into three classes: all kinds of large-scale flexibles of Rigid Base band
Accessory class spacecraft, Rigid Base band large size composite flexible structure accessory class spacecraft, Grazing condition structure class spacecraft.These are soft
Property structure space scale it is bigger, up to tens meters of even rice up to a hundred, production of small using density, Low rigidity materials, have
Large deflection, non-linear, small damping, modal frequency be low and the physical characteristics such as intensive.
Non-contact measurement compares traditional sensor contact measurement and has many good qualities.Non-contact measurement will not influence
The dynamic property of measurand, will not because of influencing its normal work on testee additional mass, to measurand without
Damage and strong antijamming capability.But the precision of non-contact measurement is generally lower than contact type measurement.Non-contact measurement is
A kind of simple and effective vibration measuring method, common are the methods of laser vibration measurer, laser sensor, binocular vision system,
In, the binocular vision system vibration measuring method that is made of two high speed cameras with image procossing and analytical technology mature,
Increasingly become a kind of simple and convenient vibration measuring method with very high use value.
Utility model content
In order to overcome shortcoming and deficiency of the existing technology, the utility model provides a kind of truss support circular membrane structure
Vibration detection device.
The binocular vision system that the utility model is made of high speed camera carries out the index point of film surface tested region
High frequency shooting, obtains image sequence, and the processing of cooperation respective image, analysis obtain the vibration information of film deployed configuration.
The utility model adopts the following technical solution:
A kind of vibration detection device of truss support circular membrane structure, including film bulk and excitation detection part；
The film bulk includes disc type film, support plate and flexible truss, and the disc type film is fixed on support
Plate, flexible truss are used to support support plate, and the disc type film includes unfolded state and tightening state, and driving support plate is realized
Disc type film is by tightening state to unfolded state；
The excitation detection part includes two high speed cameras, laser, vibration excitor, computer, signal generator and function
Rate amplifier；
Described two high speed cameras are mounted on camera support, so that the disc type film of unfolded state is located at two high speeds
In the field range of camera, and the optical axis of high speed camera is vertical with the face of disc type film；
Laser is located at right above the center of the disc type film of unfolded state, projects laser point；
The signal generator issues vibration signal, and vibration excitor is driven after power amplifier amplifies, further motivates exhibition
The thin vibration of membrane of disc type under open state；
Two high speed camera shootings input computer comprising the image of laser point.
The laser point is specifically the circumference array laser point of symmetrical " babysbreath " formula.
It further include guide rail backing plate, guide rail, holder and slide, the high speed camera is fixed on slide by holder, slide
It is fixed on guide rail by guide rail backing plate, the guide rail is fixed on camera support.
There are four the exciting implement bodies, is separately fixed on the diagonal line of experimental bench, the mandril and support plate of vibration excitor
Connection.
The disc type film is the planar graph of not curved surface.
The support plate is specially 12 pieces.
The disc type film is plastic film.
The utility model has the beneficial effects that
(1) a kind of vibration measurement device of disc type film deployed configuration of the utility model is made of two high speed cameras
Binocular vision system can carry out non-contact measurement to vibration ontology under the premise of not bringing additive effect to system, improve
System robustness, therefore it is relatively high to measure the precision obtained.
(2) because the volume of disc type film deployed configuration is larger, the vibration detection device of the utility model uses binocular vision
The multimetering mode of feel system detects film deployed configuration ontology, can multi-modes coupled vibrations to film into
Row decoupling, the Vibration Condition of accurate reduction vibration ontology.
(3) the utility model using guide rail, sliding block, holder composition can horizontal displacement supporting structure, cooperation is adjustable
The truss structure of height, composition one can horizontal, vertical displacement binocular vision system, be conducive to the calibration and difference of camera
The vibration measurement of the film of shape size obtains the vibration characteristics of more accurate film deployed configuration.
Detailed description of the invention
Fig. 1 is the general structure schematic diagram of the utility model；
Fig. 2 is the front view of the utility model；
Fig. 3 is the top view of the utility model；
Fig. 4 is the right view of the utility model.
Specific embodiment
Below with reference to examples and drawings, the utility model is described in further detail, but the reality of the utility model
It is without being limited thereto to apply mode.
Embodiment
As Figure 1-Figure 4, a kind of vibration detection device of truss support circular membrane structure, including film bulk and excitation
Detection part；
The film bulk includes disc type film 9, support plate 10 and flexible truss 11, and disc type film is fixed on support
On plate, flexible truss is used to support support plate.The disc type film includes unfolded state and tightening state, the circle of unfolded state
Disc type film is in and is fully deployed, and the truss that stretches after expansion is in locking state；When in fully unfolded position, disc type film
It is respectively at tensioning and lock state with flexible truss, not considering to be vibrated by expansion process bring influences.Hereinafter it has been
Film after full expansion.
Support plate is connected and fixed on experimental bench by cylinder support and driving unfolding mechanism, and film is not curved surface
Planar rondure, so that disc type film and experimental bench keeping parallelism state under tensioning state, support plate has 12 pieces, according to circle
It is uniformly arranged in week below disc type film, and is connect with film, driving unfolding mechanism is by driving support plate to keep disc type thin
Film is successively opened as fan, is gradually spread out entire round for one.Film bulk is in the center of experimental bench, convenient for vibration
The image of dynamic detection obtains and the installation of the symmetry of excitation.The experimental bench 1 is barricaded as by aluminum profile, is fixed by corner fittings, finally
Pass through the screw installation panel of quadrangle and the connecting pin with ground face contact.
In the present embodiment, experimental bench 1 is assembled by the aluminum profile that three kinds of length are respectively 4500mm, 500mm, and table top is
One piece of 4620mm × 4620mm × 8mm stainless steel plate, is connect by screw with profile, and there is angle bar in each junction of profile
It is fixed.The full-size of disc type film unfolding mechanism is Φ 1700mm × 400mm, and flexible truss and support plate are by aluminium conduct
Material, film are plastic film.
Motivate detection part: including two high speed cameras 5, laser 7, vibration excitor 2, computer 12, signal generator 14
And power amplifier 13；
Two high speed cameras constitute two-sided vision detection system, are mounted on two slides 8 by two holders 6 respectively,
Two slides 8 can move on guide rail 4, and guide rail 4 is fixed on camera support, and slide can be fixed by guide rail backing plate 3
To change the positional relationship between two high speed cameras 5, high speed camera is mounted on holder 6 for sliding on the guide rail 4 of camera support
On, thus it is possible to vary the angle of high speed camera and shooting surface meets the vibration detection needs of the membrane structure of various shape size,
End face is detected when camera position should make disc type film deployed configuration static is located substantially at viewing field of camera middle position, it is thin to guarantee
When film vibrates, disc type film deployed configuration is in always in the field range of camera, guarantees the continuity of measurement, camera optical axis
Line is vertical with the face of film, and camera front is enabled to shoot its film surface.
The camera support is made of three pillars, and two arranged in parallel, and third root is vertically set on two upper
End, the high speed camera and laser are installed on the pillar being laterally arranged.
Laser is located at the surface of entire disc type thin film center, to project the Circle-Array of symmetrical " babysbreath " formula
Column laser point is index point, convenient for binocular vision system identification shooting image；The size of the point of the described mark dot matrix, spacing,
Color and focal length are adjustable, can satisfy the vibration detection requirement under different size of detection body and different mounting heights,
And laser can long time continuous working do not generate light decay phenomenon, and have it is stronger also possess anti-seismic performance at line effect,
Can be reduced influences brought by ontology vibration.
The present embodiment high speed camera selects in Wuhan the model Memrecam HX-3E for creating Lian Da Science and Technology Ltd.
High speed camera, possess 5,000,000 pixels, and frame speed is up to 2000 frames/second under the full resolution, frame speed reaches under full HD pixel
4670 frames/second, 1,000,000 pixels assign 9220 frames/second, inside save as 64GB, and operating temperature range is 0-40 degrees Celsius, and weight is about
5.9 kilograms, the power supply needed is 100-240V AC-1.5A, 50-60Hz.Laser selects the model of Shenzhen Zhong Lai scientific & technical corporation
For ZLM100MTX650-16GD laser, optical maser wavelength 650nm, output power 100mW, operating current≤180mA is supplied
Piezoelectric voltage DC2.8-5.2V, facular model, dot matrix, optical lens: lenticular lenses (German import).
Vibration excitor is specially four, passes through screw respectively by Corner Strapped on the diagonal line of Platform board for experiment, vibration excitor top
Bar is connected with support plate cushion block is mounted on；The vibrational excitation part receives the generation of signal generator 14, puts via power
After the vibration signal that big device 13 amplifies, by vibration excitor mandril motivate disc type film deployed configuration generate mode of flexural vibration vibration and
Torsion mode vibration.
The vibration excitor passes through the excitation film deployed configuration mode of flexural vibration vibration of vibration excitor mandril and torsion mode respectively
Vibration；When vibration excitor receives sinusoidal signal excitation identical with mode of flexural vibration frequency, vibration excitor presses identical signal and phase
Identical excitation then motivates the bending vibration of film deployed configuration；When two vibration excitors receive it is identical with Torsion mode frequency
When sinusoidal signal excitation, two vibration excitors are motivated by identical signal and opposite in phase, then motivate and generate film deployed configuration
Twisting vibration.
The Binocular vision photogrammetry model is to carry out Image Acquisition work by two high speed cameras, while to same target
Make, obtains target in the image of two cameras in left and right, then by the difference at this visual angle, using binocular vision principle of parallax,
Go to calculate the space coordinate of the target.Two CCD camera measure system is divided into two kinds according to placement form: one is two cameras
The ideal measurement model of absolute parallel placement；One is the measurement models of two not parallel placements of camera optical axis.In fact, absolutely
Parallel placement can not be accomplished, so being not parallel placement model in the application of Binocular vision photogrammetry.Industry at present
The scaling method of level calculation machine vision measurement it is multi-purpose be Zhang Zhengyou plane reference method, when calibration only need one it is simple accurate
Calibrating template, and stated accuracy is higher.
Laser turn-on power supply emits laser, and signal generator 14 issues vibration signal, after the amplification of power amplifier 13
It is sent to vibration excitor 2, vibration excitor 2 motivates the vibration of disc type film deployed configuration generation different frequency by vibration excitor mandril；
Two high speed cameras synchronize high frequency shooting to the vibration detection index point region on film, collect image sequence, send
To computer, computer 12 reads the image that high speed camera takes, and is carried out by Zhang Zhengyou calibration method to two industrial cameras
Calibration extracts the coordinate of image spot feature calculation laser point, is further processed to obtain the vibration information of film unfolding mechanism, and
Carry out visualization processing.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by described
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (7)
1. a kind of vibration detection device of truss support circular membrane structure, which is characterized in that including film bulk and excitation detection
Part；
The film bulk includes disc type film, support plate and flexible truss, and the disc type film is fixed on support plate, stretches
Contracting truss is used to support support plate, and the disc type film includes unfolded state and tightening state, and driving support plate realizes disk
Formula film is by tightening state to unfolded state；
The excitation detection part includes that two high speed cameras, laser, vibration excitor, computer, signal generator and power are put
Big device；
Described two high speed cameras are mounted on camera support, so that the disc type film of unfolded state is located at two high speed cameras
Field range in, and the optical axis of high speed camera is vertical with the face of disc type film；
Laser is located at right above the center of the disc type film of unfolded state, projects laser point；
The signal generator issues vibration signal, drives vibration excitor after power amplifier amplifies, further excitation expansion shape
The thin vibration of membrane of disc type under state；
Two high speed camera shootings input computer comprising the image of laser point.
2. vibration detection device according to claim 1, which is characterized in that the laser point is specifically symmetrical " all over the sky
The circumference array laser point of star " formula.
3. vibration detection device according to claim 1, which is characterized in that further include guide rail backing plate, guide rail, holder and cunning
Seat, the high speed camera are fixed on slide by holder, and slide is fixed on guide rail by guide rail backing plate, and the guide rail is fixed
On camera support.
4. vibration detection device according to claim 1, which is characterized in that there are four the exciting implement bodies, solid respectively
It is scheduled on the diagonal line of experimental bench, the mandril of vibration excitor is connect with support plate.
5. vibration detection device according to claim 1, which is characterized in that the disc type film is the flat of not curved surface
Face figure.
6. vibration detection device according to claim 1-5, which is characterized in that the support plate is specially 12
Block.
7. vibration detection device according to claim 1-5, which is characterized in that the disc type film is plastics
Film.
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| CN201820978550.4U CN208383291U (en) | 2018-06-25 | 2018-06-25 | A kind of vibration detection device of truss support circular membrane structure |
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| CN201820978550.4U CN208383291U (en) | 2018-06-25 | 2018-06-25 | A kind of vibration detection device of truss support circular membrane structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709626A (en) * | 2018-06-25 | 2018-10-26 | 华南理工大学 | A kind of vibration detection device and method of truss support circular membrane structure |
-
2018
- 2018-06-25 CN CN201820978550.4U patent/CN208383291U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709626A (en) * | 2018-06-25 | 2018-10-26 | 华南理工大学 | A kind of vibration detection device and method of truss support circular membrane structure |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190115 Termination date: 20210625 |
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| CF01 | Termination of patent right due to non-payment of annual fee |