CN107167235B - Device and method for detecting vibration of hinged honeycomb plate based on digital image correlation algorithm - Google Patents
Device and method for detecting vibration of hinged honeycomb plate based on digital image correlation algorithm Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting the vibration of a hinged honeycomb plate based on a digital image correlation algorithm, wherein the device comprises a hinged honeycomb plate body, a point throwing device, an industrial camera, a vibration exciter and a computer, wherein the hinged honeycomb plate body consists of three honeycomb sandwich plates, every two honeycomb sandwich plates are connected through a hinge between the plates, one end of the hinged honeycomb plate body is mechanically connected to a metal support through a clamping plate and a steel frame, and the other end of the hinged honeycomb plate body is a free end; the point projector is used as a structural light source to provide a characteristic area capable of tracking and monitoring for the binocular vision system, and the industrial camera extracts and collects three-dimensional coordinate information of the honeycomb panel body. The vibration of the honeycomb panel body is detected by adopting a digital image correlation method, so that the accuracy of a measuring system is high, the interference to a measured object is small, the full-field measurement can be realized, and in addition, the device can be used for simulating and researching the vibration characteristics of the solar sailboard.
Description
Technical Field
The invention relates to the field of positioning and vibration detection of flexible structures, in particular to a device and a method for detecting vibration of a hinged honeycomb plate based on a digital image correlation algorithm.
Background
After the spacecraft enters the target orbit, the solar sailboard is unfolded, the hinge between the two boards is in a locking state, and the position relationship between the two boards is fixed, so that the solar sailboard can be approximately regarded as a thin rectangular board.
The carbon fiber and aluminum honeycomb composite material has the excellent performances of high specific strength, high specific rigidity, light weight, heat insulation, vibration resistance, designable thermal expansion coefficient and the like, and is widely applied to the aspects of spacecraft cabin plate structures, equipment supports, solar wing substrates and the like. The composite honeycomb sandwich structure is formed by combining three basic materials, and comprises an upper panel, a lower panel, a core layer and an adhesive between the bonding core layer and the panels, wherein the upper surface and the lower surface are formed by thin panels, and bending rigidity, plane tension and compression and shearing rigidity are provided; the middle honeycomb core is thicker and has low density, and separates the upper panel from the lower panel to provide a transmission path for transverse shear stress flow; the bonding layer connects the honeycomb core and the panel, which is convenient for load transfer.
In the research of vibration measurement and active control of large flexible structures, the use of a binocular vision system to measure the vibration of the structure has unique advantages. Binocular vision is a non-contact measurement that does not alter the vibration characteristics of the structure, and thus results in more accurate measurements. The digital image correlation method is to determine the vibration information of the object according to the statistical correlation of the spot fields randomly distributed on the surface of the object before and after vibration, and has the advantages of real-time, non-contact, high precision, panoramic measurement, small interference to the measured object and the like. The traditional two-dimensional digital image correlation method can only measure two-dimensional displacement and strain, and can realize three-dimensional displacement measurement of an object based on the binocular stereoscopic vision principle and the digital image correlation method.
Disclosure of Invention
The invention aims at overcoming the defects and shortcomings of the prior art, and provides a device for detecting the vibration of a hinged honeycomb plate based on a digital image correlation algorithm, so as to realize non-contact and real-time accurate measurement of the vibration of a body of the hinged honeycomb plate.
Another object of the present invention is to provide a method for detecting vibration of an articulated honeycomb panel based on a digital image correlation algorithm.
The aim of the invention can be achieved by the following technical scheme:
the hinged honeycomb plate vibration detection device based on the digital image correlation algorithm comprises a hinged honeycomb plate body part, a projection measurement part, a vibration excitation part and a computer, wherein the hinged honeycomb plate body part comprises three honeycomb sandwich plates which are made of the same material and have the same size, namely a first honeycomb sandwich plate, a second honeycomb sandwich plate and a third honeycomb sandwich plate, every two honeycomb sandwich plates are connected together through two plate hinges at upper and lower symmetrical positions, the first honeycomb sandwich plate end of the formed hinged honeycomb plate body is mechanically connected to a metal support through a clamp plate and a steel frame, the metal support is vertically fixed on a horizontally placed experimental pedestal, the other end of the hinged honeycomb plate body is a free end, and the hinged honeycomb plate body is vertical to the horizontal plane of the experimental pedestal; the projection measuring part comprises a point projector and two industrial cameras, wherein the point projector and the two industrial cameras are fixed on the foot rest, the mirror surface of the point projector is opposite to the surface of the hinged honeycomb plate body, and the two industrial cameras are respectively arranged at two sides of the point projector, so that the field of view of the two industrial cameras fully comprises a second honeycomb sandwich plate and a third honeycomb sandwich plate; the vibration excitation part comprises three vibration exciters of the same type and a high-voltage amplifier matched with the vibration exciters, the three vibration exciters are uniformly distributed in the width direction of the first honeycomb sandwich plate, which is close to the metal support, the positions of the upper vibration exciters and the lower vibration exciters are symmetrical about the central line in the width direction, and the vibration exciters in the middle position are positioned on the central line in the width direction.
Further, the honeycomb sandwich panel is composed of a honeycomb core, an adhesive layer and a panel, wherein the adhesive layer bonds the upper panel and the lower panel with the honeycomb core into an integral rigid structure.
Further, the plate hinge consists of a male hinge, a female hinge, a coil spring, a pin shaft, a locking swing rod and an eccentric screw, when the plate hinge is unfolded, the male hinge and the female hinge relatively rotate around the pin shaft under the action of the coil spring of the driving element, a pin on the locking swing rod slides along an unfolding slideway on the male hinge in the rotating process, and slides into and finally is clamped at the bottom of the locking groove along the left side of the locking groove on the male hinge at the end stage of the unfolding process; in the locked state, the positional relationship between the honeycomb sandwich panels is fixed, and the hinged honeycomb panel body is fully unfolded, and the hinged honeycomb panel body in this state can be regarded as an integral rectangular plate.
Further, the hinged honeycomb panel vibration detection device based on the digital image correlation algorithm can be used for simulating and researching the vibration characteristics of the body of the solar sailboard after the solar sailboard is unfolded.
The other object of the invention can be achieved by the following technical scheme:
a method for detecting vibration of an articulating honeycomb panel based on a digital image correlation algorithm, the method comprising the steps of:
step one, vibration excitation signals sent by a computer are transmitted to a high-voltage amplifier after A/D conversion, the signals are transmitted to three vibration exciters after being amplified by the high-voltage amplifier, and the vibration exciters excite the bending or torsional vibration of the hinged honeycomb panel body according to different combination modes of the signals;
step two, opening a spot projector, uniformly projecting light spots onto the surfaces of a second honeycomb sandwich plate and a third honeycomb sandwich plate to form a light spot field with continuous characteristic areas, acquiring continuous images of a hinged honeycomb plate vibration body by using a binocular vision measurement system formed by two industrial cameras, dividing and selecting interesting characteristic subareas on the images, and running a corresponding digital image correlation algorithm to obtain three-dimensional coordinate information of the interesting areas, so that vibration information of the hinged honeycomb plate body is indirectly obtained;
and thirdly, repeatedly testing by changing the form, frequency and amplitude parameters of the excitation signal, and obtaining a plurality of test results to obtain the vibration characteristics of the hinged honeycomb panel body.
In the first step, the bending vibration of the hinged honeycomb plate body can be excited by transmitting excitation signals with the same frequency and the same phase to the three vibration exciters; the torsional vibration of the hinged honeycomb plate body can be excited by transmitting signals with the same frequency and opposite phases to the vibration exciters at the upper end and the lower end.
In the second step, the interested feature subareas are divided and selected on the acquired continuous images, the characteristic subareas are used as reference positions for vibration detection, the images containing the subareas before and after vibration are matched, the statistical correlation before and after vibration of the positions is analyzed to determine and extract vibration displacement information of the vibration body of the hinged honeycomb plate, the quantity of the interested areas and the positions of the interested areas on the vibration body of the hinged honeycomb plate are changed, and vibration information of different parts of the hinged honeycomb plate body can be acquired simultaneously in the detection process, so that the method can be used for measuring multi-order modal coupling vibration of the hinged honeycomb plate and realizing decoupling of vibration.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention utilizes the mode of combining the projection of the marker point by the point projector with the detection of the camera, on one hand, the invention can realize the completely non-contact measurement of the vibration of the hinged honeycomb plate, and the measurement result has higher accuracy; on the other hand, compared with the method of coating spots on the surface of the vibration body, the method of projecting the spots is efficient and easy to implement, the projected spots are regular in shape and good in inhibition, the subsequent operation of image analysis and processing can be fully simplified, and a good foundation is provided for a vibration detection method related to digital images.
2. The device for detecting the vibration of the hinged honeycomb plates based on the digital image correlation algorithm can be used for researching the influence of the nonlinear characteristic of the hinge joint on a vibration system, the vibration of the hinged honeycomb plates can be influenced due to the existence of nonlinear factors such as friction and the like at the parts joint of the hinge between the plates, the vibration conditions of the second hinged honeycomb plate and the third hinged honeycomb plate are detected at the same time, and the acquired data can be used for researching the dynamics characteristic of the hinge. The device simulates the vibration of the solar sailboard under the influence of the nonlinear characteristic at the hinge, and provides a good foundation for further researching the vibration characteristic of the solar sailboard.
3. The vibration detection device provided by the invention adopts the hinged honeycomb plate and the shaft pin type hinge structure to simulate the solar sailboard structure, so that the vibration condition of the solar sailboard structure in space can be restored more truly, and the vibration characteristics obtained through measurement and analysis also have a guiding effect on the design and manufacture of the solar sailboard structure of the spacecraft.
4. According to the method, the vibration detection is carried out on the experimental object by adopting a digital image correlation method, the vibration information is extracted according to the statistical characteristics of the region of interest during image processing and analysis, and compared with the traditional information extraction on a single mark point, the method utilizes more image information, so that the vibration signal obtained by measurement is more accurate.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a device for detecting vibration of an articulated honeycomb panel according to embodiment 1 of the present invention based on a digital image correlation algorithm.
Fig. 2 is a schematic view showing the structure of an inter-plate hinge according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of a honeycomb sandwich panel according to embodiment 1 of the present invention.
Fig. 4 is a schematic view of a spot field formed by a projection point according to embodiment 2 of the present invention.
Fig. 5 is a schematic diagram of the principle of the digital image correlation algorithm of embodiment 2 of the present invention for matching images containing sub-areas before and after vibration.
The device comprises a 1-foot rest, a 2-industrial camera, a 3-point throwing device, a 4-third honeycomb sandwich board (4-1-honeycomb core, 4-2-bonding layer, 4-3-panel), a 5-plate hinge (5-1-male hinge, 5-2-coil spring, 5-3-slideway, 5-4-female hinge, 5-5-eccentric screw, 5-6-pin shaft, 5-7-locking swing rod, 5-8-pin), a 6-second honeycomb sandwich board, a 7-first honeycomb sandwich board, an 8-vibration exciter, a 9-steel frame, a 10-metal support, an 11-experiment pedestal, a 12-high-voltage amplifier and a 13-computer.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, the embodiment provides a hinged honeycomb panel vibration detection device based on a digital image correlation algorithm, which comprises a hinged honeycomb panel body part, a projection measurement part, a vibration excitation part and a computer (13), wherein the hinged honeycomb panel body part comprises three honeycomb sandwich panels with the same size, namely a first honeycomb sandwich panel (7), a second honeycomb sandwich panel (6) and a third honeycomb sandwich panel (4), each two honeycomb sandwich panels are connected together through two inter-panel hinges (5) at upper and lower symmetrical positions, the first honeycomb sandwich panel end of the formed hinged honeycomb panel body is mechanically connected to a metal support (10) through a clamping plate and a steel frame (9), the metal support (10) is vertically fixed on a horizontally placed experiment table (11), the other end of the hinged honeycomb panel body is a free end, and the hinged honeycomb panel body is vertical to the horizontal plane of the experiment table (11); the projection measurement part comprises a point throwing device (3) and two industrial cameras (2), wherein the point throwing device (3) and the two industrial cameras (2) are fixed on a foot rest (1), the mirror surface of the point throwing device (3) is opposite to the surface of the hinged honeycomb plate body, the two industrial cameras (2) are respectively arranged at two sides of the point throwing device (3), and the field of view range of the two industrial cameras is ensured to fully contain a second honeycomb sandwich plate (6) and a third honeycomb sandwich plate (4); the vibration excitation part comprises three vibration exciters (8) of the same type and a high-voltage amplifier (12) which is matched with the vibration exciters, the three vibration exciters (8) are uniformly distributed on the width direction of the first honeycomb sandwich plate (7) close to the metal support (10), the positions of the upper vibration exciters and the lower vibration exciters (8) are symmetrical about the central line in the width direction, and the vibration exciters (8) in the middle position are positioned on the central line in the width direction.
The structure diagram of the honeycomb sandwich panel is shown in fig. 3, and the honeycomb sandwich panel consists of a honeycomb core (4-1), an adhesive layer (4-2) and a panel (4-3), wherein the adhesive layer (4-2) bonds the upper panel layer (4-3) and the lower panel layer (4-1) into an integral rigid structure. The structure diagram of the inter-plate hinge (5) is shown in figure 2, and the inter-plate hinge consists of a male hinge (5-1), a female hinge (5-4), a coil spring (5-2), a pin shaft (5-6), a locking swing rod (5-7) and an eccentric screw (5-5), wherein when the inter-plate hinge (5) is unfolded, the male hinge (5-1) and the female hinge (5-4) relatively rotate around the pin shaft (5-6) under the action of the coil spring (5-2) of a driving element, and a pin (5-8) on the locking swing rod (5-7) slides along an unfolding slideway (5-3) on the male hinge (5-1) firstly in the rotating process, slides into the left side of a locking groove on the male hinge (5-1) at the end of the unfolding process and finally is clamped at the bottom of the locking groove; in the locked state, the positional relationship between the honeycomb sandwich panels is fixed, and the hinged honeycomb panel body is fully unfolded, and the hinged honeycomb panel body in this state can be regarded as an integral rectangular plate.
The hinged honeycomb panel vibration detection device based on the digital image correlation algorithm can be used for simulating and researching the vibration characteristics of the body of the solar sailboard after the solar sailboard is unfolded.
The three honeycomb plate sandwich plates used in this embodiment all have dimensions of 500mm×500mm×16.3mm, wherein each cell of the honeycomb core has a regular hexagon shape, a side length of 6mm, a wall thickness of 0.07mm, a height of 15mm, a material mark of a3003-H19, and a panel thickness of 0.5mm, and an epoxy resin material is used. The elastic modulus of the epoxy resin is E p =34.64 Gpa, density ρ=1840 kg/m 3 . The industrial camera (1) is a GIGE camera with the model number of acA to 1600 gc manufactured by Basler company of Germany, a CMOS photosensitive chip is adopted, the highest frame rate is 60fps, and the resolution ratio is 1600 multiplied by 1200; a lens of a light management company is selected, the model is FL-HC0614-2M, the focal length is 6mm, and the size is phi 32mm multiplied by 35.7mm. The projector (3) is a projector with the model PRO-SPOT/A manufactured by Geodetic System, and can project 600-2300 points at a time with the accuracy of 10 μm. The vibration exciter (8) is an APA1000XL vibration exciter manufactured by Cedrat technologies company, the maximum displacement which can be generated under no load is 1297um, the maximum exciting force is 471.21N, and the precision can reach 10.99nm;the high voltage amplifier (12) is a 2350 dual channel amplifier manufactured by Tegam company, and has a peak value of 400Vp-p at maximum.
Example 2:
the embodiment provides a method for detecting the vibration of a hinged honeycomb panel based on a digital image correlation algorithm, which comprises the following steps:
step one, vibration excitation signals sent by a computer (13) are transmitted to a high-voltage amplifier (12) after A/D conversion, the signals are amplified by the high-voltage amplifier (12) and then transmitted to three vibration exciters (8), and the vibration exciters (8) excite bending or torsional vibration of the hinged honeycomb panel body according to different combination forms of the signals;
in the step, the bending vibration of the hinged honeycomb plate body can be excited by transmitting excitation signals with the same frequency and the same phase to the three vibration exciters (8); the torsional vibration of the hinged honeycomb plate body can be excited by transmitting signals with the same frequency and opposite phases to the vibration exciters (8) at the upper end and the lower end.
Step two, opening a spot projector (3), uniformly projecting light spots onto the surfaces of a second honeycomb sandwich plate (6) and a third honeycomb sandwich plate (4), forming a light spot field with continuous characteristic areas by a light spot field schematic diagram formed by projection points as shown in fig. 4, acquiring continuous images of a hinged honeycomb plate vibration body by using a binocular vision measurement system consisting of two industrial cameras (2), dividing and selecting interesting characteristic subareas on the images, running a corresponding digital image correlation algorithm, and obtaining three-dimensional coordinate information of the interesting areas, thereby indirectly obtaining vibration information of the hinged honeycomb plate body;
in the step, the interested feature subareas are divided and selected on the acquired continuous images, the characteristic subareas are used as reference positions for vibration detection, the images containing the subareas before and after vibration are matched, the statistical correlation before and after vibration of the positions is analyzed to determine and extract the vibration displacement information of the vibration body of the hinged honeycomb plate, the number of the interested areas and the positions of the interested areas on the vibration body of the hinged honeycomb plate are changed, and the vibration information of different parts of the hinged honeycomb plate body can be acquired simultaneously in the detection process, so that the method can be used for measuring multi-order modal coupling vibration of the hinged honeycomb plate, and decoupling of vibration is realized.
The schematic diagram of the principle of the digital image correlation algorithm for matching the images containing the subareas before and after vibration is shown in fig. 5, wherein one image is used as a reference image and is expressed as f (x, y), the other image is used as an image to be matched and is expressed as g (x, y), and the two-dimensional digital correlation method is used for matching the two images through correlation operation to obtain a displacement field. Selecting one of the reference images f (x, y) as M (x) 0 ,y 0 ) A sub-region of (2n+1) x (2n+1) as the center, and performing progressive scanning operation on a region to be matched in an image g (x, y) to be matched by a certain correlation matching algorithm by using gray information in the sub-region to find M' (x) 0 ′,y 0 ') as a central target image subregion, the image subregion can be divided and selected by oneself according to the vibration information to be extracted.
The three-dimensional digital correlation method combines a two-dimensional digital correlation method with binocular stereoscopic vision measurement, and the matching of the three-dimensional digital correlation method in the measurement process comprises two links: two-dimensional matching and stereo matching. Two-dimensional matching refers to matching of images before and after vibration of an object acquired by the same camera, and three-dimensional matching refers to matching of images at the same moment, wherein a three-dimensional matching process can also adopt a matching method shown in fig. 5.
The similarity criterion adopted in this embodiment is Normalized Cross Correlation (NCC), and the calculation formula is:
the range of NCC (x, y) of the correlation coefficient matrix calculated by the algorithm is [ -1,1], the position of the coefficient 1 represents a perfect match, -1 represents a bad match, and 0 represents no correlation. The correlation coefficient of the best matching position is usually 0.8 in consideration of the influence of interference noise and the like.
And thirdly, repeatedly testing by changing the form, frequency and amplitude parameters of the excitation signal, and obtaining a plurality of test results to obtain the vibration characteristics of the hinged honeycomb panel body.
The above description is only of the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive conception of the present invention equally within the scope of the disclosure of the present invention.
Claims (5)
1. The utility model provides a hinge honeycomb panel vibration detection device based on digital image correlation algorithm which characterized in that: the device comprises a hinged honeycomb plate body part, a projection measuring part, a vibration exciting part and a computer, wherein the hinged honeycomb plate body part comprises three honeycomb sandwich plates which are made of the same material and have the same size, namely a first honeycomb sandwich plate, a second honeycomb sandwich plate and a third honeycomb sandwich plate; the projection measuring part comprises a point projector and two industrial cameras, wherein the point projector and the two industrial cameras are fixed on the foot rest, the mirror surface of the point projector is opposite to the surface of the hinged honeycomb plate body, and the two industrial cameras are respectively arranged at two sides of the point projector, so that the field of view of the two industrial cameras fully comprises a second honeycomb sandwich plate and a third honeycomb sandwich plate; the vibration excitation part comprises three vibration exciters of the same type and a high-voltage amplifier matched with the vibration exciters, the three vibration exciters are uniformly distributed in the width direction of the first honeycomb sandwich plate, which is close to the metal support, the positions of the upper vibration exciters and the lower vibration exciters are symmetrical about the central line in the width direction, and the vibration exciters in the middle position are positioned on the central line in the width direction;
the honeycomb sandwich panel consists of a honeycomb core, an adhesive layer and a panel, wherein the adhesive layer bonds the upper panel and the lower panel with the honeycomb core into an integral rigid structure;
the hinge between the plates consists of a male hinge, a female hinge, a coil spring, a pin roll, a locking swing rod and an eccentric screw, when the hinge between the plates is unfolded, the male hinge and the female hinge relatively rotate around the pin roll under the action of the coil spring of a driving element, a pin on the locking swing rod slides along an unfolding slideway on the male hinge in the rotating process, and slides into and is finally clamped at the bottom of a locking groove along the left side of the locking groove on the male hinge at the end stage of the unfolding process; in the locked state, the positional relationship between the honeycomb sandwich panels is fixed, and the hinged honeycomb panel body is fully unfolded, and the hinged honeycomb panel body in this state can be regarded as an integral rectangular plate.
2. The device for detecting vibration of an articulated cellular board based on a digital image correlation algorithm according to claim 1, wherein: the hinged honeycomb panel vibration detection device based on the digital image correlation algorithm can be used for simulating and researching the vibration characteristics of the body of the solar sailboard after the solar sailboard is unfolded.
3. A method of a hinged cellular board vibration detection apparatus based on a digital image correlation algorithm according to claim 1, said method comprising the steps of:
step one, vibration excitation signals sent by a computer are transmitted to a high-voltage amplifier after A/D conversion, the signals are transmitted to three vibration exciters after being amplified by the high-voltage amplifier, and the vibration exciters excite the bending or torsional vibration of the hinged honeycomb panel body according to different combination modes of the signals;
step two, opening a spot projector, uniformly projecting light spots onto the surfaces of a second honeycomb sandwich plate and a third honeycomb sandwich plate to form a light spot field with continuous characteristic areas, acquiring continuous images of a hinged honeycomb plate vibration body by using a binocular vision measurement system formed by two industrial cameras, dividing and selecting interesting characteristic subareas on the images, and running a corresponding digital image correlation algorithm to obtain three-dimensional coordinate information of the interesting areas, so that vibration information of the hinged honeycomb plate body is indirectly obtained;
and thirdly, repeatedly testing by changing the form, frequency and amplitude parameters of the excitation signal, and obtaining a plurality of test results to obtain the vibration characteristics of the hinged honeycomb panel body.
4. A method for detecting vibration of an articulated honeycomb panel based on a digital image correlation algorithm according to claim 3, wherein: in the first step, the bending vibration of the hinged honeycomb plate body can be excited by transmitting excitation signals with the same frequency and the same phase to the three vibration exciters; the torsional vibration of the hinged honeycomb plate body can be excited by transmitting signals with the same frequency and opposite phases to the vibration exciters at the upper end and the lower end.
5. A method for detecting vibration of an articulated honeycomb panel based on a digital image correlation algorithm according to claim 3, wherein: in the second step, the interested feature subareas are divided and selected on the collected continuous images, the characteristic subareas are used as reference positions for vibration detection, the images containing the subareas before and after vibration are matched, the statistical correlation before and after vibration of the positions is analyzed to determine and extract the vibration displacement information of the vibration body of the hinged honeycomb plate, the vibration information of different parts of the hinged honeycomb plate body can be collected simultaneously in the detection process by changing the number of the interested areas and the positions of the interested areas on the vibration body of the hinged honeycomb plate, and the method can be used for measuring the multi-order modal coupling vibration of the hinged honeycomb plate, so that the decoupling of the vibration is realized.
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| CN108760025B (en) * | 2018-07-12 | 2023-08-18 | 华南理工大学 | Vibration detection device and method for multiple flexible boards |
| CN108692900B (en) * | 2018-07-12 | 2023-06-20 | 华南理工大学 | Device and method for detecting rotation vibration of multiple flexible hinge plates |
| CN109060284B (en) * | 2018-08-07 | 2020-07-10 | 广东工业大学 | Test mode analysis method based on DIC technology |
| CN109115877B (en) * | 2018-08-07 | 2021-08-24 | 广东工业大学 | Curvature modal damage identification method based on DIC technology |
| CN109067362B (en) * | 2018-09-03 | 2020-01-31 | 上海空间电源研究所 | Flexible solar cell circuit on-track machine electric heating comprehensive environment simulation device and method |
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| DE102004029552A1 (en) * | 2004-06-18 | 2006-01-05 | Peter Mäckel | Method for visualizing and measuring oscillations of oscillating objects by means of a combination of a synchronized, stroboscopic image recording with image correlation method |
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| CN102519378A (en) * | 2011-11-30 | 2012-06-27 | 华南理工大学 | Device for measuring bending and torsional vibration of hinged plate of phase-sensitive detector (PSD) sensor and method for device |
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