CN108709632B - Vibration detection device and method for guy cable connection flexible structure - Google Patents
Vibration detection device and method for guy cable connection flexible structure Download PDFInfo
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- CN108709632B CN108709632B CN201810764952.9A CN201810764952A CN108709632B CN 108709632 B CN108709632 B CN 108709632B CN 201810764952 A CN201810764952 A CN 201810764952A CN 108709632 B CN108709632 B CN 108709632B
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- 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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Abstract
The invention discloses a vibration detection device and a method for a guy cable connection flexible structure, which comprises a flexible structure part, a detection part and a vibration excitation part, wherein the flexible structure part is connected with a flexible structure; the flexible structure part comprises a flexible structure, a flexible fixing frame, rigid plates and a flexible guy rope, the flexible structure is formed by connecting N rows of rigid plates and M columns of rigid plates, the detection part comprises a guide rail, a high-speed camera, a holder and a sliding block, and the vibration excitation part comprises a computer, a power amplifier, a signal generator and a vibration exciter.
Description
Technical Field
The invention relates to the field of vibration measurement of flexible structures, in particular to a vibration detection device and method for a guy cable connected flexible structure.
Background
The solar cell wing is a power generation device consisting of a solar cell group combined in a series-parallel mode and a supporting structure thereof, is connected with a cabin body structure of a space station, is folded and fixed on the side wall of the cabin body structure during launching, and is unlocked, released, unfolded and tracked according to a flight program after entering the orbit. According to the development and application conditions of solar cell wings of foreign space stations, the complete solar cell wing of the space station generally needs to comprise a solar cell array mechanism structure, a solar cell, a circuit, a solar cell wing stretching mechanism and the like.
Non-contact measurement has many advantages over conventional sensor contact measurement. The non-contact measurement does not affect the dynamic performance of the measured object, does not affect the normal work of the measured object due to the additional mass of the measured object, and has no damage to the measured object and strong anti-interference capability. However, the accuracy of non-contact measurement is generally lower than that of contact measurement. The non-contact measurement is a simple and effective vibration measurement method, and common methods include a laser vibration meter, a laser sensor, a binocular vision system and the like, wherein the binocular vision system vibration measurement method formed by two high-speed cameras is mature along with the development of image processing and analysis technology, and becomes a simple and convenient vibration measurement method with high use value. The high-speed camera vibration measurement is a multipoint measurement method, compared with some single-point measurement methods, the high-speed camera vibration measurement has great advantages when measuring modal changes of a plurality of points, as long as the resolution and shooting frequency of the high-speed camera are high enough, the shooting range is large enough, only a plurality of mark points need to be made in the measured range, the high-speed camera vibration measurement can accurately measure the vibration of the plurality of points in one range to obtain modal information of the plurality of points, finally, a binocular vision system can decouple the multi-order modes of the vibration of the measured object, the complex multi-order modes can be simplified into the superposition of the plurality of first-order modes, and the vibration information can be more visually expressed.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a vibration detection device and method of a guy cable connection flexible structure.
The invention adopts the following technical scheme:
a vibration detection device of a guy cable connection flexible structure comprises a flexible structure part, a detection part and a vibration excitation part;
the flexible structure part comprises a flexible structure, a flexible fixing frame, rigid plates and flexible guy cables, wherein the flexible structure consists of N rows of rigid plates and M columns of rigid plates, adjacent rigid plates are connected through the flexible guy cables, and the flexible structure is fixed on the flexible fixing frame through the flexible guy cables;
the detection part comprises a guide rail, two high-speed cameras, a cradle head and a sliding block, the flexible structure is in the field range of the two high-speed cameras, the high-speed cameras are fixed on the sliding block through the cradle head, and the sliding block moves on the guide rail;
the vibration exciting part comprises a computer, a power amplifier, a signal generator and a vibration exciter, the computer is connected with the high-speed camera, and the signal generator, the power amplifier and the vibration exciter are sequentially connected.
Initial position of the high speed camera: the lens is in the central position of the flexible structure.
The rigid plate is a square aluminum plate of 300mm x 300 mm.
The flexible guy rope is an elastic nylon rope, and the length of the flexible guy rope is 50 mm.
The flexible guy cables are fixed on the left and right quartering points of each edge of the rigid plate.
The vibration exciters are two, are located the both sides upper end of flexible structure respectively, all install on the support through the screw, the support is fixed on the laboratory bench.
A method of guy rope attachment to a vibration detection device of a flexible structure comprising the steps of:
firstly, a signal generator sends out a vibration signal, the vibration signal is amplified by a power amplifier and then sent to a vibration exciter, and the vibration exciter excites a flexible structure through a mandril to generate vibration with different frequencies;
in the vibration process, a binocular vision system formed by two high-speed cameras performs synchronous high-frequency shooting on a vibration detection mark point area on the rigid plate and sends the vibration detection mark point area to a computer;
and thirdly, extracting the spot characteristics of the shot image by the computer to obtain the coordinates of the mark point and obtain the vibration information of the flexible structure.
The mark point is arranged at the geometric center of the square aluminum plate.
The invention has the beneficial effects that:
(1) the binocular vision system is adopted for measurement, the defects of some traditional contact measurement methods are avoided, for example, additional effects can be caused, the method is sensitive to noise, the measurement precision is not high, the binocular vision system consisting of two high-speed cameras is adopted for carrying out non-contact measurement on the satellite antenna, the robustness is strong, the method can be carried out in various complex environments, and the measurement precision is high.
(2) A high-speed camera is adopted to carry out vibration monitoring on a plurality of points of the vibration body in a full field; the satellite antenna body is large in size and complex in high-order modal shape, a single-point measuring instrument cannot be used for economically and effectively carrying out accurate measurement on the satellite antenna body, a binocular vision system formed by high-speed cameras can be used for carrying out vibration monitoring on all mark points sprayed on the satellite antenna body, and the problems are well solved.
(3) The measurement system consists of a high-speed camera, the highest shooting frequency of the high-speed camera is large enough, and the multi-order mode of the satellite antenna can be measured; the measuring system can realize the decoupling of the first few orders of low-frequency vibration modes by changing the number of the mark points and the distribution positions marked on the surface of the satellite antenna.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a front view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
As shown in fig. 1-2, a vibration detecting device with a guy cable connected with a flexible structure comprises a flexible structure part, a detecting part and a vibration exciting part.
The flexible structure part comprises a flexible structure, a flexible fixing frame, rigid plates and flexible guy cables, wherein the flexible structure is formed by connecting N rows of rigid plates 9 in M rows, N, M is an integer, the embodiment is characterized in that three rows of rigid plates in eight rows and twenty-four rows with the same size are connected and fixed with the flexible fixing frame 8 through the flexible guy cables 10, the specific mode is that two flexible guy cables are respectively arranged on each edge of each rigid plate in the vertical direction and the horizontal direction, and the two flexible guy cables are positioned on two quartering points of each edge in the horizontal direction and the vertical direction. The adjacent rigid plates are connected through flexible guy cables, and the flexible fixing frame is fixed with the adjacent rigid plates through the flexible guy cables. The distance between each flexible guy rope in each row is 150mm, the distance is half of the width of the rigid plate, and each connecting guy rope keeps the axes consistent so as to ensure the parallelism of each row of rigid plates and the perpendicularity of the rigid plates and the experiment table.
The flexible structure is fixedly connected with the experiment table 6 through the vertical square rod 7, the connection ensures that the main detection area is perpendicular to the experiment table, and the experiment table is composed of aluminum profiles and corner fittings and is installed on the experiment table through screws.
In this embodiment, the laboratory bench is assembled by three kinds of aluminium alloy that length is 3200mm, 1000mm, 500mm respectively, and the mesa is a 3320mm X1120 mm X8 mm's corrosion resistant plate, is connected with the section bar through the screw, and every junction of section bar all has the angle iron to fix. The maximum size of the guy cable connection flexible structure is 2950mm multiplied by 1200mm, the rigid plates are made of aluminum, the flexible guy cables are made of nylon ropes, the flexible fixing frames are made of plastic materials with certain elasticity, and the flexible guy cables are tensioned during installation to enable the rigid plates in each row to be kept at the same height and in the same plane.
The detection part comprises a guide rail 2, a high-speed camera 3, a holder 4 and a sliding block 5, wherein the high-speed camera comprises two cameras to form a binocular vision system, the high-speed camera is fixedly connected with the sliding block through the holder, the guide rail 2 is fixed on a camera frame 1, and the sliding block 5 can freely slide on the guide rail 2. The objects to be detected with different shapes and sizes are adapted by adjusting the position relationship such as the distance between the camera stand and the experiment table and the mutual position relationship between the cameras. The lens of the high-speed camera 3 of the binocular vision system is opposite to the plane of the rigid plate 9 of the flexible structure, the distance and the height of the camera frame enable the lens of the binocular vision system to be located at the center of the flexible structure, and the binocular vision system is enabled to shoot all the flexible structure connected with the guy cable.
The high-speed camera position should make the flexible construction when static detect the terminal surface and roughly be located the intermediate position of camera visual field to when guaranteeing the flexible construction vibration, the flexible construction body is in the visual field scope of camera all the time, has guaranteed measuring continuity, and camera optical axis is perpendicular with the measuring face of flexible construction, makes the camera can openly shoot its surface.
The binocular vision measuring system is divided into two types according to the placement form: one is an ideal measurement model with two cameras placed absolutely parallel; one is a measurement model in which the optical axes of the two cameras are not placed parallel. In practice, parallelism in the absolute sense is not present, so in the application of binocular vision measurement, a non-parallel placement model is used. At present, the calibration method for industrial-grade computer vision measurement is a Zhangyingyou plane calibration method, only a simple and accurate calibration template is needed during calibration, and the calibration precision is high.
In this embodiment, the high-speed camera is a Memrecam HX-3E high-speed camera available from Wuhan Union technologies, Inc., having 500 ten thousand pixels, a frame rate of 2000 frames/second at the full resolution, 4670 frames/second at the full high-definition pixels, 9220 frames/second at 100 ten thousand pixels, 64GB in memory, 0-40 ℃ in working temperature range, 5.9 kg in weight, and 100 + 240V AC-1.5A and 50-60Hz in power supply.
The vibration exciting part comprises a computer, a power amplifier, a signal generator and a vibration exciter, the computer 13 is connected with the high-speed camera, and the signal generator 15, the power amplifier 14 and the vibration exciter are sequentially connected.
The two vibration exciters 11 are mounted on the support 12 through screws, so that the vibration exciting positions of the vibration exciters are located at the upper end of the flexible structure and are connected with the flexible fixing frame through ejector rods, and the vibration exciting directions of the ejector rods are horizontal. The signal generator sends out signals corresponding to different vibrations, the signals are amplified by the power amplifier and then transmitted to the vibration exciter, the ejector rod excites the flexible fixing frame to enable the flexible structure to vibrate, and the phase difference of a vibrating sinusoidal signal is changed to enable the flexible structure to generate mode vibration in different forms.
Different excitation signals are sent to the two vibration exciters, so that the phases of sine signals of the vibration exciters are different, the flexible structure body generates different modal vibration, and if the vibration exciters receive the excitation of the sine signals with the same bending modal frequency, the vibration exciters excite the thin film unfolding structure to generate bending vibration according to the same excitation phases; when the two vibration exciters receive the sine signal excitation with the same frequency as the torsional mode frequency, the two vibration exciters excite according to the same signal and with opposite phases, and then the two vibration exciters excite to generate the torsional vibration of the film unfolding structure.
In the invention, a signal generator sends out a vibration signal which is amplified by a power amplifier and then sent to a vibration exciter, and the vibration exciter excites a flexible structure through a push rod to generate vibration with different frequencies; a binocular vision system formed by the two high-speed cameras performs synchronous high-frequency shooting on the rigid plate, collects image sequences and sends the image sequences to a computer. The computer extracts image light spots to obtain coordinates of the mark points, vibration information of the flexible structure is obtained through processing, visualization processing is conducted, the mark points are respectively arranged at the geometric center of the square aluminum plate, and one mark point is arranged at the center of each square aluminum plate.
The dashed lines in fig. 1 indicate the wiring relationships between the various devices, and the directional arrows indicate the direction of propagation of the detection and control signal streams.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to 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 construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. A vibration detection device of a guy cable connection flexible structure is characterized by comprising a flexible structure part, a detection part and a vibration excitation part;
the flexible structure part comprises a flexible structure, a flexible fixing frame, rigid plates and flexible guy cables, wherein the flexible structure consists of N rows of rigid plates and M columns of rigid plates, adjacent rigid plates are connected through the flexible guy cables, and the flexible structure is fixed on the flexible fixing frame through the flexible guy cables;
the detection part comprises a guide rail, two high-speed cameras, a cradle head and a sliding block, the flexible structure is in the field range of the two high-speed cameras, the high-speed cameras are fixed on the sliding block through the cradle head, and the sliding block moves on the guide rail;
the vibration exciting part comprises a computer, a power amplifier, a signal generator and a vibration exciter, the computer is connected with the high-speed camera, and the signal generator, the power amplifier and the vibration exciter are sequentially connected;
two flexible guy cables are respectively arranged on each edge of the upper side, the lower side, the left side and the right side of each rigid plate, and the two flexible guy cables are positioned on the left quartering point and the right quartering point of each edge; the flexible guy cable is made of nylon ropes, and the flexible guy cable is tensioned during installation, so that the rigid plates in each row are kept at the same height and in the same plane.
2. The vibration detection apparatus according to claim 1, wherein an initial position of the high-speed camera is: the lens is in the central position of the flexible structure.
3. The vibration detecting apparatus according to claim 1, wherein the rigid plate is a square aluminum plate of 300mm x 300 mm.
4. The vibration detection apparatus according to claim 1, wherein the flexible lanyard is an elastic nylon cord having a length of 50 mm.
5. The vibration detection device according to claim 1, wherein the number of the vibration exciters is two, the two vibration exciters are respectively located at the upper ends of the two sides of the flexible structure, and the two vibration exciters are respectively mounted on a bracket through screws, and the bracket is fixed on the experiment table.
6. A method of guy wire attachment to a vibration sensing device of a flexible structure according to any of claims 1 to 5, comprising the steps of:
firstly, a signal generator sends out a vibration signal, the vibration signal is amplified by a power amplifier and then sent to a vibration exciter, and the vibration exciter excites a flexible structure through a mandril to generate vibration with different frequencies;
in the vibration process, a binocular vision system formed by two high-speed cameras performs synchronous high-frequency shooting on a vibration detection mark point area on the rigid plate and sends the vibration detection mark point area to a computer;
and thirdly, extracting the spot characteristics of the shot image by the computer to obtain the coordinates of the mark point and obtain the vibration information of the flexible structure.
7. The method of claim 6, wherein the rigid plate is a square aluminum plate of 300mm x 300mm, and the marker point is disposed at a geometric center of the square aluminum plate.
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| CN110108347A (en) * | 2019-05-13 | 2019-08-09 | 安徽理工大学 | A kind of device and method of flexible cantilever vibration of beam non-contact measurement and Untouched control |
| 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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| CN206892604U (en) * | 2017-06-16 | 2018-01-16 | 华南理工大学 | Flexible hinged plate vibration control apparatus based on Binocular vision photogrammetry |
| CN107168398A (en) * | 2017-06-16 | 2017-09-15 | 华南理工大学 | Flexible wing vibration detection and control device and method based on high speed camera |
| CN208366458U (en) * | 2018-07-12 | 2019-01-11 | 华南理工大学 | A kind of vibration detection device of guy rope connection flexible structure |
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| Vibration control of a flexible clamped-clamped plate based on an improved FULMS algorithm and laser displacement measurement;Lingbo Xie 等;《Mechanical Systems and Signal Processing》;20160108(第75期);209-227 * |
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