CN111325718B - Strain modal analysis method and related device - Google Patents
Strain modal analysis method and related device Download PDFInfo
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- CN111325718B CN111325718B CN202010076823.8A CN202010076823A CN111325718B CN 111325718 B CN111325718 B CN 111325718B CN 202010076823 A CN202010076823 A CN 202010076823A CN 111325718 B CN111325718 B CN 111325718B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06T7/0002—Inspection of images, e.g. flaw detection
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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Abstract
The embodiment of the application provides a strain modal analysis method and a related device, wherein the method comprises the following steps: acquiring N images of a measured object, wherein the measured object comprises an elastic strain luminous composite film, and the N images are images of the measured object under different resonance frequencies; according to each image in the N images, determining N groups of brightness information of the elastic strain luminous composite film; and determining the strain mode of the measured object according to the N groups of brightness information, so that the accuracy of the strain mode can be improved.
Description
Technical Field
The application relates to the technical field of vibration measurement, in particular to a strain modal analysis method and a related device.
Background
Vibration is always an important problem in various major engineering structural designs and health monitoring, and relates to various fields of national defense, such as aerospace, mechanical manufacturing, high-speed rail, ships, vehicles, buildings and the like, people production and living and the like. Along with the development of the production technology and the improvement of the manufacturing level in China, the power structure has the trend of large-scale, high-speed, complex and light weight, and the vibration problem caused by the power structure is more remarkable. Modal analysis is the most important ring in vibration analysis, which is the process of describing the dynamic response of a system based on its inherent characteristics. Its application is mainly focused on the following aspects: (1) evaluating the dynamic characteristics of the structure; (2) diagnosis and prognosis of vibration faults; (3) noise control; (4) The weak links in the structural design are identified in an auxiliary mode and serve as the basis for structural dynamics modification; (5) structural health monitoring; and (6) verifying the accuracy of the numerical model.
At present, in the field of vibration analysis, an experimental modal analysis method and a calculation modal analysis method supplement each other. Along with the inherent defects of the system complexity and the numerical calculation method, theoretical modal analysis often has larger access to the real situation, so that the actual dynamic model of the structure is usually identified through experiments and processing of experimental data in the actual engineering application. The experimental modal analysis method can be divided into displacement modal analysis and strain modal analysis according to different measured physical quantities, and the displacement modal analysis result cannot be directly used for fatigue design of the structure, so that engineers are more concerned about the distribution condition of stress and strain from the aspects of strength and fatigue in the design of the moving machinery and the structure bearing dynamic load. The concept of strain mode was originally proposed by the british scholars Hillary et al in 1984, li Debao et al in 1989 to derive and discuss strain mode theory using displacement mode differential operations.
Currently, strain mode experiment measurement methods commonly used in the industry are two main types, namely an electrical measurement method and an optical measurement method.
Electrical measurement has become the most widely used and reliable vibration measurement method in the last century. The dynamic strain information is obtained directly or indirectly through various sensors (displacement meter, speed sensor, accelerometer, strain gauge, etc.). The method mainly has the problems that (a) the spatial resolution is not high, and the average physical quantity of the bonding part between the sensor and the test piece is measured by any sensor; (b) The full-field measurement cannot be realized, and the limitation on the measurement points is caused by the space limitations such as wiring, sensor adhesion and the like, so that the modal distribution of the full field can be calculated only by fitting after the measurement; (c) The multipoint arrangement has large measurement workload, and meanwhile, part of the sensors have low repeated utilization rate (such as strain gauges).
The optical measurement method mainly comprises (1) full-field displacement modal measurement based on laser interference; (2) Measurement methods based on a high-speed camera and various optical measurement methods (such as photoelastic method, electronic speckle, shearing speckle and interference moire) and the like; (3) Performing full-field fitting by using a scanning type laser Doppler vibration meter; (4) A digital image related displacement detection method based on a dual high-speed camera. Among the above methods, the laser Doppler vibration measurement method (Laser Doppler Vibrometry, LDV) is most widely applied and has the highest precision, and is a vibration measurement method commonly accepted in the experimental mechanics community. However, the existing optical measurement scheme is expensive in equipment, displacement mode data are required to be acquired firstly, strain modes are obtained through differential and other calculation processes, point measurement is mostly adopted for measurement, full-field fitting is required in the later period, and spatial resolution is low when strain information is acquired.
Disclosure of Invention
The embodiment of the application provides a strain mode analysis method and a related device, which can determine a strain mode by analyzing brightness information and improve the accuracy of strain mode analysis.
A first aspect of an embodiment of the present application provides a strain modal analysis method, the method including:
acquiring N images of a measured object, wherein the measured object comprises an elastic strain luminous composite film, and the N images are images of the measured object under different resonance frequencies;
according to each image in the N images, determining N groups of brightness information of the elastic strain luminous composite film;
and determining the strain mode of the measured object according to the N groups of brightness information.
With reference to the first aspect, in a possible embodiment, the determining N sets of luminance information of the elastic strained light emitting composite film according to each of the N images includes:
extracting the characteristics of each image in the plurality of images to obtain N groups of characteristic data, wherein each group of characteristic data in the N groups of characteristic data comprises the characteristic data of each pixel point of the image;
and determining the N groups of brightness information according to the N groups of characteristic data.
With reference to the first aspect, in one possible embodiment,
the brightness information comprises brightness values, and the determining the strain mode of the measured object according to the N groups of brightness information comprises the following steps:
according to the N groups of brightness information, determining a strain value corresponding to each brightness information in the N groups of brightness information to obtain N strain fields;
according to the N strain fields, N vibration modes are determined;
and determining the strain mode according to the N vibration modes.
With reference to the first aspect, in a possible embodiment, the elastically strained luminescent composite film comprises a luminescent material that emits light when the measured object is strained.
With reference to the first aspect, in a possible embodiment, the method further includes: preparing the elastic strain luminous composite film;
the preparation of the elastic strain luminescent composite film comprises the following steps:
and obtaining a target regulation doping method and a target synthesis method, and preparing the composition materials of the elastic strain light-emitting composite film to obtain the elastic strain light-emitting composite film.
A second aspect of embodiments of the present application provides a strain modal analysis apparatus, the apparatus comprising:
the device comprises an acquisition unit, a detection unit and a display unit, wherein the acquisition unit is used for acquiring N images of an object to be detected, the object to be detected comprises an elastic strain luminous composite film, and the N images are images of the object to be detected under different resonance frequencies;
a first determining unit configured to determine N sets of luminance information of the elastic strain light emitting composite film according to each of the N images;
and the second determining unit is used for determining the strain mode of the measured object according to the N groups of brightness information.
With reference to the second aspect, in a possible embodiment, the first determining unit is configured to:
extracting the characteristics of each image in the plurality of images to obtain N groups of characteristic data, wherein each group of characteristic data in the N groups of characteristic data comprises the characteristic data of each pixel point of the image;
and determining the N groups of brightness information according to the N groups of characteristic data.
With reference to the second aspect, in a possible embodiment, the second determining unit is configured to:
according to the N groups of brightness information, determining a strain value corresponding to each brightness information in the N groups of brightness information to obtain N strain fields;
according to the N strain fields, N vibration modes are determined;
and determining the strain mode according to the N vibration modes.
With reference to the second aspect, in a possible embodiment, the elastically strained luminescent composite film comprises a luminescent material that emits light when the measured object is strained.
With reference to the second aspect, in a possible embodiment, the apparatus is further configured to: preparing the elastic strain luminous composite film;
in the preparation of the elastically strained luminescent composite film, the device is for:
and obtaining a target regulation doping method and a target synthesis method, and preparing the composition materials of the elastic strain light-emitting composite film to obtain the elastic strain light-emitting composite film.
A third aspect of the embodiments of the present application provides a terminal, comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory being interconnected, wherein the memory is configured to store a computer program, the computer program comprising program instructions, the processor being configured to invoke the program instructions to execute the step instructions as in the first aspect of the embodiments of the present application.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a computer to perform part or all of the steps as described in the first aspect of the embodiments of the present application.
A fifth aspect of the embodiments of the present application provides a computer program product, wherein the computer program product comprises a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps as described in the first aspect of the embodiments of the present application. The computer program product may be a software installation package.
The implementation of the embodiment of the application has at least the following beneficial effects:
n images of the measured object are obtained, the measured object comprises an elastic strain light-emitting composite film, the N images are images of the measured object under different resonance frequencies, N groups of brightness information of the elastic strain light-emitting composite film are determined according to each image in the N images, and the strain mode of the measured object is determined according to the N groups of brightness information, so that compared with the problems that the spatial resolution of an electrical measurement method and an optical measurement method in strain mode measurement in the prior art is lower, the spatial resolution of the strain mode can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1A is a schematic diagram of an application scenario of a strain modal analysis method according to an embodiment of the present application;
fig. 1B is a schematic diagram of an application scenario of another strain modal analysis method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a strain modal analysis method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a strain modal analysis device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.
The method of modal analysis is first described below.
The experimental modal analysis is an important method in the field of vibration analysis, wherein compared with a displacement mode, the strain mode can directly reflect the strain of each part of an object under the corresponding mode, and is a modal parameter capable of reflecting the structural local characteristic change of the object.
In the prior art, when strain mode analysis of a system is performed, electrical measurement and optical measurement are commonly adopted.
The electrical measurement method mainly collects strain information of an object through various sensors, for example, a displacement meter, an acceleration sensor, a strain gauge and the like, strain information of different position points can be collected only when the method is adopted, global processing is needed to be carried out at the later stage, so that a strain mode of the object is obtained, the spatial resolution of the strain mode is low in implementation, direct measurement of global strain information cannot be realized, and therefore the method has high limitation in operability, accuracy, spatial resolution and the like.
In the optical measurement method, displacement information of an object is acquired mainly through various optical methods (laser Doppler vibration measurement, high-speed camera) and the like, and in order to obtain a strain mode, the differential relation between the displacement mode and the strain mode is needed to be recalculated in the later period, full-field fitting is needed by combining point measurement data, measurement is not direct, calculation amount is large, and equipment is expensive.
In order to solve the problems of indirect measurement, complicated measurement steps, lower operability, lower spatial resolution and the like, the embodiment of the application provides a strain mode analysis method, which adopts a method of attaching an elastic strain luminous composite film to a measured system, and the full-field strain mode of a measured object is directly obtained by collecting, analyzing and processing the brightness information of the elastic strain luminous composite film.
The embodiment of the application provides a strain mode shape acquisition method, which can greatly improve the operation convenience and the spatial resolution of strain mode measurement.
The elastic strain luminous composite film is adhered to the surface of the measured object, luminous particles are embedded in the elastic strain luminous composite film, the luminous particles emit light when vibrating, the elastic strain luminous composite film can be combined with the surface of the object in a spraying, coating and other modes, and after the elastic strain luminous composite film is arranged on the surface of the measured object, excitation with different frequencies is applied to the measured object, so that the measured object vibrates. When the measured object vibrates, the elastic strain luminous composite film is strained in the vibration process, so that the embedded luminous particles emit light, at the moment, the camera, the industrial camera and other devices shoot images, the shot images comprise the measured object and the elastic strain luminous composite film, and the images with obvious brightness distribution are extracted from the images, so that N images are obtained. The time t1 and t2 … tN when the elastic strain light-emitting composite film has obvious brightness distribution can be understood that the measured object resonates with the excitation source at the time t1 and t2 … tN, the strain generated by the object is far higher than other time, and the brightness of the image is higher than the preset threshold.
According to the brightness information (the brightness information can be represented by gray values or brightness values) of the N images, the strain field of the measured object corresponding to each image can be obtained. When the brightness information of the N images is obtained, feature extraction can be performed on each image in the N images to obtain N groups of feature data, each group of feature data in the N groups of feature data comprises feature data of each pixel point of the image, the feature data can be gray values or brightness values and the like, then the N groups of brightness information can be determined according to the feature data, and the feature data can be directly determined to be the brightness information, or the brightness information can be obtained after the feature data is processed, and the method for processing the feature data can be normalization processing and the like. The image may also be processed prior to feature extraction, and the processing of the image may include: denoising processing, image subtraction processing, contrast processing, and the like.
After obtaining N groups of brightness information of N images, determining a strain field corresponding to each group of brightness information according to each group of brightness information to obtain N strain fields, determining a corresponding vibration mode according to the strain fields, and determining a strain mode according to the vibration mode. The luminance information has a correspondence with the strain value in the strain field, which is determined by empirical or historical data.
Therefore, by the strain mode analysis method provided by the embodiment of the application, the strain field of the measured object can be obtained through the brightness information of the elastic strain light-emitting composite film, so that the strain mode of the measured object can be directly obtained, the dynamic strain of the measured object can be visually analyzed, and the convenience and accuracy in the strain mode analysis are improved.
The strain modal analysis method may further include determining a mapping relationship between brightness and strain values, and the method for determining the mapping relationship may be: the relation between the strain-luminous brightness and the vibration frequency-luminous brightness of a single point of a measured object is calibrated, and on-site parameters (such as ambient brightness, exposure time, aperture size, camera noise and the like) are filtered through variable control and comparison, so that the actual measurement result is not influenced, and the operability of the method is ensured.
Also provided is a method for preparing an elastic strain light-emitting composite film, one possible method for preparing an elastic strain light-emitting composite film comprises: and obtaining a target regulation doping method and a target synthesis method, and preparing the composition materials of the elastic strain light-emitting composite film to obtain the elastic strain light-emitting composite film. The target regulation doping method can be, for example, doping strontium aluminate, lithium niobate and the like according to a certain proportion, and the target synthesis method can be, for example, wet chemical method, oxidation-reduction reaction, powder technology and the like, and the specific steps are as follows:
the preparation method is characterized in that a high-brightness elastic stress light-emitting system (such as rare earth doped strontium aluminate, lithium niobate, transition metal ion doped zinc sulfide and the like) is selected, a physicochemical method (a high-temperature solid phase method, a hydrothermal synthesis method, a combustion method, a sol-gel method) is adopted for preparation, optimization is realized by regulating and controlling a doping scheme, adjusting reactant types, changing synthesis routes and the like, and the performance of the material is improved according to different application ranges, such as underwater environment, corrosive environment and the like. Selecting proper adhesive solvent (such as PDMS, epoxy resin, silicone rubber, silicone resin, etc.), regulating solute doping proportion, doping particles, solidifying proportion, temperature, etc. to realize optimal preparation of composite membrane
As shown in fig. 1A, fig. 1A is a schematic diagram of an application scenario of a strain modal analysis method according to an embodiment of the present application. The method for carrying out strain modal analysis specifically comprises the following steps of: firstly, a prefabricated elastic strain luminous composite film is coated on a vehicle shell beam, the vehicle shell is excited through an excitation system to vibrate, so that the elastic strain luminous composite film coated on the vehicle shell beam is deformed, embedded luminous particles emit light, different parts deform differently to enable the luminous brightness to be different, the brightness distribution is shown on the composite film, the elastic strain luminous composite film is subjected to image acquisition through an image acquisition system and is transmitted to an image processing system, the images are subjected to analysis processing (denoising processing, contrast processing, gray value normalization processing and the like), the strain mode shape of the whole field of the tested vehicle shell is obtained, and the tested whole field strain mode can be obtained by combining data such as mode frequency, coordinates and the like.
Fig. 1B is a schematic diagram of an application scenario of another strain modal analysis method according to an embodiment of the present application, as shown in fig. 1B. As shown in fig. 1B, the strain analysis system 102 includes an image acquisition device 1021 and a processor 1022, the image acquisition device 1021 is configured to perform image acquisition on the measured object 101, and the processor 1022 performs analysis processing on the image acquired by the image acquisition device to obtain strain distribution of the measured object 101, where the measured object 101 includes an elastic strain light emitting composite film 1011.
The image acquisition apparatus 101 may include: cameras, photon detectors, light sensors, etc., which are used primarily to capture images of the light emitted by the light-emitting composite film 1011, including elastic strain.
The elastic strain light-emitting composite film 1011 is disposed on the surface of the measured object 101 in a manner including spraying, coating, etc., and when the measured object 101 is strained, the elastic strain light-emitting composite film 1011 emits light with different intensities, so as to reflect the vibration of the measured object 101.
The object 101 is exemplified as a bridge, and may be any other object that needs strain detection.
Referring to fig. 2, fig. 2 is a schematic flow chart of a strain modal analysis method according to an embodiment of the present application. As shown in fig. 2, the strain modal analysis method includes steps 201-203, specifically as follows:
201. n images of the measured object are obtained, the measured object comprises an elastic strain luminous composite film, and the N images are images of the measured object under different resonance frequencies.
When acquiring N images, the N images may be acquired by an image capturing device, and specifically, reference may be made to the image acquisition method in the foregoing embodiment, which is not described herein.
202. And determining N groups of brightness information of the elastic strain light-emitting composite film according to each image in the N images.
Each of the N sets of luminance information includes luminance information of each pixel point of the image. When determining the N groups of brightness information, the image may be subjected to feature extraction, the brightness information is obtained according to feature data, and the feature data may be a gray value or a brightness value.
203. And determining the strain mode of the measured object according to the N groups of brightness information.
When the strain mode is determined, a strain field can be determined according to the brightness information, then the mode shape of the strain mode is determined according to the strain field, and the strain mode is determined according to the mode shape.
In this example, by acquiring N images of a measured object, where the measured object includes an elastic strain light-emitting composite film, the N images are images of the measured object at different resonant frequencies, according to each image in the N images, N sets of luminance information of the elastic strain light-emitting composite film are determined, and according to the N sets of luminance information, a strain mode of the measured object is determined, so that compared with the problem that spatial resolution of an electrical measurement method and an optical measurement method in strain mode measurement in the existing scheme is lower, spatial resolution of the strain mode can be improved.
In one possible embodiment, the determining N sets of luminance information of the elastic strained light emitting composite film according to each of the N images includes:
extracting the characteristics of each image in the plurality of images to obtain N groups of characteristic data, wherein each group of characteristic data in the N groups of characteristic data comprises the characteristic data of each pixel point of the image;
and determining the N groups of brightness information according to the N groups of characteristic data.
In one possible embodiment of the present invention,
the brightness information comprises brightness values, and the determining the strain mode of the measured object according to the N groups of brightness information comprises the following steps:
according to the N groups of brightness information, determining a strain value corresponding to each brightness information in the N groups of brightness information to obtain N strain fields;
according to the N strain fields, N vibration modes are determined;
and determining the strain mode according to the N vibration modes.
In one possible embodiment, the elastically strained luminescent composite film comprises a luminescent material that emits light when the measured object is strained.
In one possible embodiment, the method further comprises: preparing the elastic strain luminous composite film;
the preparation of the elastic strain luminescent composite film comprises the following steps:
and obtaining a target regulation doping method and a target synthesis method, and preparing the composition materials of the elastic strain light-emitting composite film to obtain the elastic strain light-emitting composite film.
For simplicity and convenience in description, the strain mode in the strain mode analysis method, the luminance information, the preparation method of the elastic strain luminescent composite film, and the like are not described in detail, and the specific implementation manner thereof may be referred to the corresponding description in the foregoing embodiment, which is not repeated here.
In accordance with the foregoing embodiments, referring to fig. 3, fig. 3 is a schematic structural diagram of a terminal provided in an embodiment of the present application, as shown in the fig. 3, including a processor, an input device, an output device, and a memory, where the processor, the input device, the output device, and the memory are connected to each other, and the memory is configured to store a computer program, where the computer program includes program instructions, where the processor is configured to invoke the program instructions, and where the program includes instructions for performing the following steps;
acquiring N images of a measured object, wherein the measured object comprises an elastic strain luminous composite film, and the N images are images of the measured object under different resonance frequencies;
according to each image in the N images, determining N groups of brightness information of the elastic strain luminous composite film;
and determining the strain mode of the measured object according to the N groups of brightness information.
The foregoing description of the embodiments of the present application has been presented primarily in terms of a method-side implementation. It will be appreciated that, in order to achieve the above-mentioned functions, the terminal includes corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein may be embodied as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the application may divide the functional units of the terminal according to the above method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated in one processing unit. The integrated units may be implemented in hardware or in software functional units. It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice.
In accordance with the foregoing, referring to fig. 4, fig. 4 is a schematic structural diagram of a strain modal analysis device according to an embodiment of the present application. As shown in fig. 4, the apparatus includes:
an acquiring unit 401, configured to acquire N images of a measured object, where the measured object includes an elastic strain light-emitting composite film, and the N images are images of the measured object at different resonance frequencies;
a first determining unit 402, configured to determine N sets of luminance information of the elastic strain light emitting composite film according to each of the N images;
and the second determining unit 403 is configured to determine a strain mode of the measured object according to the N sets of brightness information.
With reference to the second aspect, in a possible embodiment, the first determining unit 402 is configured to:
extracting the characteristics of each image in the plurality of images to obtain N groups of characteristic data, wherein each group of characteristic data in the N groups of characteristic data comprises the characteristic data of each pixel point of the image;
and determining the N groups of brightness information according to the N groups of characteristic data.
With reference to the second aspect, in a possible embodiment, the second determining unit 403 is configured to:
according to the N groups of brightness information, determining a strain value corresponding to each brightness information in the N groups of brightness information to obtain N strain fields;
according to the N strain fields, N vibration modes are determined;
and determining the strain mode according to the N vibration modes.
In one possible embodiment, the elastically strained luminescent composite film comprises a luminescent material that emits light when the measured object is strained.
In a possible embodiment, the device is further adapted to: preparing the elastic strain luminous composite film;
in the preparation of the elastically strained luminescent composite film, the device is for:
and obtaining a target regulation doping method and a target synthesis method, and preparing the composition materials of the elastic strain light-emitting composite film to obtain the elastic strain light-emitting composite film.
The embodiment of the application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program makes a computer execute part or all of the steps of any one of the strain modal analysis methods described in the embodiment of the method.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps of any one of the strain modal analysis methods as set forth in the method embodiments above.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented either in hardware or in software program modules.
The integrated units, if implemented in the form of software program modules, may be stored in a computer-readable memory for sale or use as a stand-alone product. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a memory, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned memory includes: a U-disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be implemented by a program that instructs associated hardware, and the program may be stored in a computer readable memory, which may include: flash disk, read-only memory, random access memory, magnetic or optical disk, etc.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. A method of strain modal analysis, the method comprising:
acquiring N images of a measured object, wherein the measured object comprises an elastic strain luminous composite film, and the N images are images of the measured object under different resonance frequencies;
according to each image in the N images, determining N groups of brightness information of the elastic strain luminous composite film; the brightness information includes a brightness value;
according to the N groups of brightness information, determining the strain mode of the measured object comprises the following steps: according to the N groups of brightness information, determining a strain value corresponding to each brightness information in the N groups of brightness information to obtain N strain fields; according to the N strain fields, N vibration modes are determined; determining the strain mode according to the N vibration modes; and the brightness information has a corresponding relation with the strain value in the strain field, and the corresponding relation is determined by historical data.
2. The method of claim 1, wherein determining N sets of luminance information for the elastically strained light-emitting composite film from each of the N images comprises:
extracting the characteristics of each image in the N images to obtain N groups of characteristic data, wherein each group of characteristic data in the N groups of characteristic data comprises the characteristic data of each pixel point of the image;
and determining the N groups of brightness information according to the N groups of characteristic data.
3. The method of claim 1 or 2, wherein the elastically strained luminescent composite film comprises a luminescent material that emits light when the test object is strained.
4. A method according to claim 3, characterized in that the method further comprises: preparing the elastic strain luminous composite film;
the preparation of the elastic strain luminescent composite film comprises the following steps:
and obtaining a target regulation doping method and a target synthesis method, and preparing the composition materials of the elastic strain light-emitting composite film to obtain the elastic strain light-emitting composite film.
5. A strain modal analysis device, the device comprising:
the device comprises an acquisition unit, a detection unit and a display unit, wherein the acquisition unit is used for acquiring N images of an object to be detected, the object to be detected comprises an elastic strain luminous composite film, and the N images are images of the object to be detected under different resonance frequencies;
a first determining unit configured to determine N sets of luminance information of the elastic strain light emitting composite film according to each of the N images; the brightness information includes a brightness value;
the second determining unit is configured to determine a strain mode of the measured object according to the N sets of brightness information, and includes: according to the N groups of brightness information, determining a strain value corresponding to each brightness information in the N groups of brightness information to obtain N strain fields; according to the N strain fields, N vibration modes are determined; determining the strain mode according to the N vibration modes; and the brightness information has a corresponding relation with the strain value in the strain field, and the corresponding relation is determined by historical data.
6. The apparatus of claim 5, wherein the first determining unit is configured to:
extracting the characteristics of each image in the N images to obtain N groups of characteristic data, wherein each group of characteristic data in the N groups of characteristic data comprises the characteristic data of each pixel point of the image;
and determining the N groups of brightness information according to the N groups of characteristic data.
7. A terminal comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory being interconnected, wherein the memory is adapted to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any of claims 1-4.
8. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program comprising program instructions which, when executed by a processor, cause the processor to perform the method of any of claims 1-4.
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