CN108709626A - A kind of vibration detection device and method of truss support circular membrane structure - Google Patents
A kind of vibration detection device and method of truss support circular membrane structure Download PDFInfo
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- CN108709626A CN108709626A CN201810658222.0A CN201810658222A CN108709626A CN 108709626 A CN108709626 A CN 108709626A CN 201810658222 A CN201810658222 A CN 201810658222A CN 108709626 A CN108709626 A CN 108709626A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of vibration detection devices and method 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, vibrator, computer, signal generator and power amplifier.The vibration detection device of the present invention is made of binocular vision system, can be carried out non-contact measurement to measuring 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 present invention relates to flexible structure vibration measurement fields, and in particular to a kind of vibration inspection of truss support circular membrane structure
Survey apparatus and method.
Background technology
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, make, have up to tens meters of even rice up to a hundred, small using density, Low rigidity materials
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 does not interfere with
The dynamic property of measurand will not influence its normal work because of 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.
Invention content
In order to overcome shortcoming and deficiency of the existing technology, the present invention to provide a kind of shaking for truss support circular membrane structure
Motion detection device and method.
The binocular vision system that the present invention is made of high speed camera carries out high frequency to the index point of film surface tested region
Shooting, obtains image sequence, and the processing of cooperation respective image, analysis obtain the vibration information of film deployed configuration.
The present invention adopts the following technical scheme that：
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, vibrator, computer, signal generator and work(
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 over the center of the disc type film of unfolded state, projects laser point；
The signal generator sends out vibration signal, and vibrator is driven after power amplifier amplifies, further encourages exhibition
The thin vibration of membrane of disc type under open state；
Two images of the high speed camera shooting comprising laser point input computer.
The laser point is specifically the circumference array laser point of symmetrical " babysbreath " formula.
Further include guide rail backing plate, guide rail, holder and slide, the high speed camera is fixed on by holder on slide, 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 vibrator
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.
A kind of method of the vibration detection device of truss support circular membrane structure, includes the following steps：
First step laser turn-on power supply emits laser, adjusts the focal length of the sent out laser of laser, reaches shooting and want
It asks；
Second step signal generator sends out vibration signal, and vibrator is sent to after power amplifier amplifies, and vibrator is logical
Cross the vibration that vibrator mandril excitation disc type film deployed configuration generates different frequency；
Third walks during film deployed configuration vibrates, and the binocular vision system being made of two high speed cameras is to thin
Vibration detection index point region on film synchronizes high frequency shooting, collects image sequence, is sent to computer；
Four-step calculation is machine-readable to take the image that high speed camera takes, by two industrial cameras of Zhang Zhengyou standardizations pair into
Rower is fixed, 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.
Vibrator encourages the vibration of film deployed configuration mode of flexural vibration and torsion mode to vibrate by vibrator mandril respectively；When
When vibrator receives sinusoidal signal excitation identical with mode of flexural vibration frequency, vibrator presses identical signal and phase is identical sharp
It encourages, then encourages the bending vibration of film deployed configuration；When two vibrators receive sinusoidal letter identical with Torsion mode frequency
When number excitation, two vibrators are encouraged by identical signal and opposite in phase, then the torsion for generating film deployed configuration is encouraged to shake.
Beneficial effects of the present invention：
(1) a kind of vibration measurement device of disc type film deployed configuration of the invention forms binocular by two high speed cameras
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, vibration detection device of the invention uses binocular vision system
The multimetering mode of system is detected film deployed configuration ontology, can be solved to the multi-modes coupled vibrations of film
Coupling, the Vibration Condition of accurate reduction vibration ontology.
(3) present invention using guide rail, sliding block, holder composition can horizontal displacement supporting structure, coordinate adjustable height
Truss structure, composition one can horizontal, vertical displacement binocular vision system, be conducive to calibration and the different shape of camera
The vibration measurement of the film of size obtains the vibration characteristics of more accurate film deployed configuration.
Description of the drawings
Fig. 1 is the general structure schematic diagram of the present invention；
Fig. 2 is the front view of the present invention；
Fig. 3 is the vertical view of the present invention；
Fig. 4 is the right view of the present invention.
Specific implementation mode
With reference to embodiment and attached drawing, 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, 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-out state with flexible truss, does not consider the vibration effect brought by expansion process.It has been hereinafter
Film after full expansion.
Support plate is connected and fixed to by cylinder bearing and driving unfolding mechanism on experimental bench, and film is not curved surface
Planar rondure so that the disc type film under tensioning state and experimental bench keeping parallelism 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 opened successively as fan, is gradually spread out entire round for one.Film bulk is in the center of experimental bench, convenient for shaking
The image of dynamic detection obtains and the installation of the symmetry of excitation.The experimental bench 1 is barricaded as by aluminium section bar, is fixed by corner fittings, finally
The connecting pin installed panel by the screw of quadrangle and contacted with ground.
In the present embodiment, experimental bench 1 is assembled by the aluminium section bar that three kinds of length are respectively 4500mm, 500mm, and table top is
The stainless steel plate of one piece of 4620mm × 4620mm × 8mm is connect by screw with proximate matter, and there is angle bar in each junction of proximate matter
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.
Encourage detection part：Including two high speed cameras 5, laser 7, vibrator 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 bearing, and slide can be fixed by guide rail backing plate 3
It is slided on the guide rail 4 of camera support to change the position relationship between two high speed cameras 5, high speed camera is mounted on holder 6
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 variously-shaped size,
End face is detected when camera position should make disc type film deployed configuration static is located substantially at viewing field of camera centre position, it is thin to ensure
When film vibrates, disc type film deployed configuration is in the field range of camera always, ensures the continuity measured, camera optical axis
Line is vertical with the face of film so that camera positive can 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 the Circle-Array of symmetrical " babysbreath " formula of projection
Row 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 meet 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 reduce influences caused by ontology vibration.
The present embodiment high speed camera selects the model Memrecam HX-3E of wound Lian Da Science and Technology Ltd.s in Wuhan
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 lasers, optical maser wavelength 650nm, output power 100mW, operating current≤180mA supplies
Piezoelectric voltage DC2.8-5.2V, facular model, dot matrix, optical lens：Lenticular lenses (German import).
Vibrator is specially four, respectively by screw by Corner Strapped on the diagonal line of Platform board for experiment, vibrator top
Bar is connected with mounted on support plate cushion block；The vibrational excitation part receives the generation of signal generator 14, is put via power
After the vibration signal that big device 13 amplifies, by vibrator mandril encourage disc type film deployed configuration generate mode of flexural vibration vibration and
Torsion mode vibrates.
The vibrator encourages the vibration of film deployed configuration mode of flexural vibration and torsion mode by vibrator mandril respectively
Vibration；When vibrator receives sinusoidal signal excitation identical with mode of flexural vibration frequency, vibrator presses identical signal and phase
Identical excitation then encourages the bending vibration of film deployed configuration；When two vibrators receive it is identical with Torsion mode frequency
When sinusoidal signal excitation, two vibrators are encouraged by identical signal and opposite in phase, then encourage 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, obtain target two cameras in left and right image, 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, be not parallel placement model so 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 methods, 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 sends out vibration signal, after the amplification of power amplifier 13
It is sent to vibrator 2, vibrator 2 encourages the vibration of disc type film deployed configuration generation different frequency by vibrator 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 two industrial cameras of Zhang Zhengyou standardizations pair
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.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (9)
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 is put including two high speed cameras, laser, vibrator, computer, signal generator and power
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 over the center of the disc type film of unfolded state, projects laser point；
The signal generator sends out vibration signal, and vibrator is driven after power amplifier amplifies, further excitation expansion shape
The thin vibration of membrane of disc type under state；
Two images of the high speed camera shooting comprising laser point input computer.
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 by holder on slide, and slide is fixed on by guide rail backing plate on guide rail, 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 vibrator 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. according to claim 1-5 any one of them vibration detection devices, which is characterized in that the support plate is specially 12
Block.
7. according to claim 1-5 any one of them vibration detection devices, which is characterized in that the disc type film is plastics
Film.
8. a kind of method of the vibration detection device of truss support circular membrane structure of claim 1-7 any one of them is applied,
It is characterised in that it includes following steps：
First step laser turn-on power supply emits laser, adjusts the focal length of the sent out laser of laser, reaches photographing request；
Second step signal generator sends out vibration signal, vibrator is sent to after power amplifier amplifies, vibrator is by swashing
The device mandril that shakes encourages the vibration of disc type film deployed configuration generation different frequency；
Third walks during film deployed configuration vibrates, and the binocular vision system being made of two high speed cameras is on film
Vibration detection index point region synchronize high frequency shooting, collect image sequence, be sent to computer；
Four-step calculation is machine-readable to take the image that high speed camera takes, by two industrial cameras of Zhang Zhengyou standardizations pair into rower
It is fixed, the coordinate of image spot feature calculation laser point is extracted, is further processed to obtain the vibration information of film unfolding mechanism, go forward side by side
Row visualization processing.
9. the method according to claim 8, which is characterized in that vibrator encourages film exhibition by vibrator mandril respectively
Opening structure mode of flexural vibration vibrates and torsion mode vibration；Swash when vibrator receives sinusoidal signal identical with mode of flexural vibration frequency
When encouraging, vibrator presses identical signal and the identical excitation of phase, then encourages the bending vibration of film deployed configuration；When two vibrators
When receiving sinusoidal signal excitation identical with Torsion mode frequency, two vibrators are swashed by identical signal and opposite in phase
It encourages, then encourages the twisting vibration for generating film deployed configuration.
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Cited By (1)
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| CN111323111A (en) * | 2020-03-11 | 2020-06-23 | 北京空间飞行器总体设计部 | Modal test system suitable for film antenna under vacuum environment |
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