Vibration testing method and vibration testing system

Abstract

The present application relates to the technical field of vibration test, and provides a vibration test method and a vibration test system, the vibration test method comprising: discretizing modeling of a measured structure, and establishing a simulation model; performing modal analysis on the simulation model, and determining modal parameters; the modal parameters comprising natural frequencies and modal shapes; determining test points and test directions corresponding to the test points based on the modal parameters; performing laser vibration test on the test points according to the test directions, and obtaining test results. Through modal analysis on the simulation model of the measured structure, the natural frequencies and the modal shapes are obtained, the test points that need to be tested are automatically selected based on the natural frequencies and the modal shapes, and the test directions and the test sequence of the test points are determined, which avoids manual selection of the test points by the test personnel according to experience, and the vibration test results cannot accurately and comprehensively reflect the real vibration state of the measured structure, and the accuracy of the test results is improved.

Description

Technical Field

[0001] This invention relates to the field of vibration testing technology, and in particular to a vibration testing method and a vibration testing system. Background Technology

[0002] Vibration testing is a testing method used to evaluate the vibration performance of an object or system. By applying one or more external excitations to an object, and then measuring and analyzing the object's vibration response, one can understand the stability, durability, and reliability of its structure.

[0003] Existing vibration testing methods are still mainly based on simple physical experiments. The formulation of test plans and the selection of test points rely heavily on the experience of test personnel. The test operation process and test data collection are all done manually by test personnel. Especially for complex equipment such as semiconductor refrigeration equipment, which requires many test points, the risk of introducing errors by manually selecting test points is relatively large, resulting in the final vibration test results failing to accurately and comprehensively reflect the true vibration state of the tested structure. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a vibration testing method to address the issue that in existing technologies, the manual selection of test points leads to vibration test results that cannot accurately and comprehensively reflect the true vibration state of the tested structure.

[0005] The present invention also proposes a vibration testing system.

[0006] A vibration testing method according to a first aspect of the present invention includes:

[0007] Discretize and model the structure under test to establish a simulation model;

[0008] Modal analysis is performed on the simulation model to determine the modal parameters, which include natural frequencies and mode shapes.

[0009] Based on the modal parameters, the test point and the test direction corresponding to the test point are determined;

[0010] Laser vibration testing is performed on the test point according to the test direction to obtain the test results.

[0011] According to the vibration testing method of the present invention, determining the test point and the test direction corresponding to the test point based on the modal parameters includes:

[0012] Based on the modal parameters, determine the natural frequency order of the target;

[0013] Points with amplitudes greater than a preset amplitude threshold are selected from the natural frequency orders as test points;

[0014] The test direction is determined based on the amplitude components of the test point in a preset three-dimensional direction, wherein the amplitude component corresponding to the test direction is greater than the amplitude components corresponding to other directions.

[0015] According to an embodiment of the vibration testing method of the present invention, before performing laser vibration testing on the test point according to the test direction, the method includes:

[0016] For each test point, a simulated laser beam is generated by the simulation unit along the test direction;

[0017] Based on the simulated laser beam, accessibility detection is performed on the test point to obtain the accessibility detection result;

[0018] If the reachability detection result is true, the test point and the test direction are added to the test set;

[0019] If the reachability detection result is false, but the reachability detection result is true in the opposite direction of the test direction, the opposite direction of the test direction is taken as the test direction, and the test point and the test direction are added to the set to be tested.

[0020] According to an embodiment of the vibration testing method of the present invention, when the reachability detection results are both false along the test direction and in the opposite direction of the test direction, the method includes:

[0021] Search for a target test point within a preset area around the test point; wherein the target test point satisfies the following conditions: it is parallel to the test direction, and the reachability detection result is true;

[0022] The target test point is used as the test point, and the test point and the test direction are added to the set to be tested.

[0023] According to the vibration testing method of the present invention, the preset area is the area corresponding to the point where the amplitude of the vibration is within a preset difference from the amplitude of the test point, and the step of searching for the target test point within the preset area around the test point includes:

[0024] Based on the test point, a replacement test point is determined; wherein the replacement test point is located in a preset direction of the test point, and the replacement test point is at a preset distance from the test point;

[0025] If the replacement test point satisfies the following conditions: it is parallel to the test direction and the reachability detection result is true, then the replacement test point shall be used as the target test point.

[0026] If the reachability detection result is false when the replacement test point is obtained, the replacement test point is re-determined in the preset area until the replacement test point is true when the reachability detection result is obtained, or until the preset area is completely searched.

[0027] According to an embodiment of the vibration testing method of the present invention, the method further includes:

[0028] If none of the points within the preset area satisfy the condition that the reachability detection result is true, the test point and the test direction are added to the risk point set and a warning is issued.

[0029] According to an embodiment of the vibration testing method of the present invention, the step of performing laser vibration testing on the test point according to the test direction to obtain test results includes:

[0030] The test points in the set to be tested are sorted based on the test point parameters to obtain a sorted set to be tested; the test point parameters include the test direction and the coordinates of the test points.

[0031] According to the sorted order of the test set, and according to the test direction, the test points are subjected to laser vibration tests in sequence.

[0032] According to the vibration testing method of the present invention, the step of sorting the test points in the test set based on test point parameters to obtain a sorted test set includes:

[0033] The test set is sorted once according to the first sorting rule to obtain the first sorted set; the first sorting rule is the sorting rule for the test points based on the test direction;

[0034] The first sorted set is sorted a second time according to the second sorting rule to obtain the second sorted set. The second sorting rule is a sorting rule that sorts the test points with the same test direction based on the height of the test point.

[0035] The second sorted set is sorted three times according to the third sorting rule to obtain the third sorted set; the third sorting rule is a sorting rule that sorts test points with the same test direction and the same test height based on the horizontal coordinate of the test point.

[0036] The third sorted set is used as the sorted test set.

[0037] According to an embodiment of the vibration testing method of the present invention, after performing laser vibration testing on the test point according to the test direction and obtaining the test result, the method further includes:

[0038] The test results are processed to obtain the response parameter information of the tested structure; the response parameter information includes at least one of acceleration information, velocity information, and displacement information.

[0039] A vibration testing system according to a second aspect of the present invention includes:

[0040] The model building module is used to discretize and model the structure under test and build a simulation model.

[0041] The analysis module is used to perform modal analysis on the simulation model and determine the modal parameters;

[0042] The determination module is used to determine the test points and test directions based on the modal parameters;

[0043] The testing module is used to perform laser vibration testing on the test point according to the test direction and obtain the test results.

[0044] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0045] Embodiments of the present invention provide a vibration testing method and a vibration testing system. The vibration testing method includes: discretizing and modeling the structure under test to establish a simulation model; performing modal analysis on the simulation model to determine modal parameters, including natural frequencies and mode shapes; determining test points and corresponding test directions based on the modal parameters; and performing laser vibration testing on the test points according to the test directions to obtain test results. By performing modal analysis on the simulation model of the structure under test to obtain natural frequencies and mode shapes, and automatically selecting test points based on these natural frequencies and mode shapes, and determining the test directions for the test points, the method avoids the need for testers to manually select test points based on experience, which could lead to vibration test results that fail to accurately and comprehensively reflect the true vibration state of the structure under test, thus improving the accuracy of the test results.

[0046] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1This is a flowchart illustrating the vibration testing method provided in this embodiment of the invention. Figure 1 ;

[0049] Figure 2 This is a flowchart illustrating the vibration testing method provided in this embodiment of the invention. Figure 2 ;

[0050] Figure 3 This is a schematic diagram of the interference between the virtual laser beam and the two-dimensional and three-dimensional structures provided in the embodiments of the present invention;

[0051] Figure 4 This is a flowchart illustrating the vibration testing method provided in this embodiment of the invention. Figure 3 ;

[0052] Figure 5 This is a schematic diagram of the pipe structure provided in an embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of the structure of the pipeline simulation model provided in the embodiment of the present invention. Figure 1 ;

[0054] Figure 7 This is a schematic diagram of the structure of the pipeline simulation model provided in the embodiment of the present invention. Figure 2 ;

[0055] Figure 8 This is a schematic diagram of the vibration testing system provided in an embodiment of the present invention. Detailed Implementation

[0056] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0057] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0059] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Figure 1 A flowchart illustrating the vibration testing method provided in this application embodiment. Figure 1 . Reference Figure 1 This application provides a vibration testing method, which may include:

[0062] S101, Discretize and model the structure under test to establish a simulation model;

[0063] In this embodiment, the measured results can be modeled in three dimensions using 3D design software. The 3D model is then imported into simulation analysis software for setting parameters such as mesh generation, material properties, boundary conditions, and loads to establish a simulation model. In one feasible implementation, this simulation model is a finite element model of the measured structure. This allows for the numerical solution of equations in the simulation analysis software based on material properties, boundary conditions, and other loading conditions, yielding results such as stress and displacement from the simulation model, facilitating analysis.

[0064] Understandably, the simulation model contains information such as the geometry, material properties, and boundary conditions of the structure under test.

[0065] S102, Perform modal analysis on the simulation model to determine modal parameters; modal parameters include natural frequencies and mode shapes;

[0066] Understandably, methods for modal analysis of simulation models can include: calculating the stiffness matrix and mass matrix of the structure under test based on the simulation model; obtaining the natural frequencies and corresponding modal shapes of the structure under test by solving the eigenvalue problem; and then plotting the mode shape image of each mode based on the eigenvectors, i.e., the mode shape, which reflects the vibration mode and vibration parameters of the structure under test in different modes.

[0067] S103, based on modal parameters, determine the test point and the corresponding test direction;

[0068] In this embodiment, after performing modal analysis on the simulation model and determining the modal parameters, the frequency response of the tested structure to external excitation is further calculated based on the modal parameters, including but not limited to information such as amplitude and phase, and then test points are selected accordingly.

[0069] In one alternative implementation, such as Figure 2 As shown, the method for determining test points and test directions is as follows:

[0070] S201, Based on modal parameters, determine the natural frequency order of the target;

[0071] In this embodiment, based on the frequency response range of the excitation received by the structure under test, the natural frequency order of interest, i.e., the target natural frequency order, is identified. Here, the natural frequency order refers to the relationship between the natural frequency of the structure under test and its rotational speed.

[0072] S202, Select points with amplitudes greater than a preset amplitude threshold in the natural frequency order as test points;

[0073] It is generally believed that points with larger amplitudes on the structure under test need to be given special attention and testing. Therefore, in this embodiment, for each natural frequency order, points with amplitudes greater than a preset amplitude threshold are extracted from the structure under test as test points based on the calculated amplitude information. The preset amplitude threshold can be a value pre-set by the tester and can be adjusted according to testing needs. In an optional implementation, to reduce the number of test points, the point with the largest amplitude can also be used as the test point; this embodiment does not impose such a limitation.

[0074] S203, determine the test direction based on the amplitude components of the test point in a preset three-dimensional direction, wherein the amplitude component corresponding to the test direction is greater than the amplitude components corresponding to other directions.

[0075] After determining the test points, it is also necessary to determine the test directions. Specifically, after modal analysis, the amplitude of the test points can be decomposed and decomposed onto the coordinate axes of a preset three-dimensional coordinate system. The preset three-dimensional directions can be the X-axis, Y-axis, and Z-axis. The directions of the X-axis, Y-axis, and Z-axis can be predetermined or the directions of the coordinate system in the simulation model can be used. The direction corresponding to the maximum amplitude component is taken as the number of test points.

[0076] It is understandable that the target natural frequency can have multiple orders, and the number of test points can also be multiple. For example, the first 5 natural frequencies and mode shapes of the simulation model can be calculated, and then the test points at each natural frequency can be determined.

[0077] S104. Based on the test direction, laser vibration test is performed on the test point to obtain the test results.

[0078] It is understandable that vibration testing methods can be divided into two main categories: contact and non-contact. Among them, non-contact vibration testing equipment mainly uses laser vibrometers, which have advantages such as no added mass, accurate measurement results, and wide applicability. They are especially suitable for equipment such as semiconductor refrigeration equipment, which are not suitable for contact vibration testing.

[0079] According to one embodiment of the present invention, before performing laser vibration testing on the test point according to the test direction to obtain the test result, the method may further include:

[0080] For each test point, a simulated laser beam is generated along the test direction using a simulation unit. Based on the simulated laser beam, accessibility detection is performed on the test point to obtain the accessibility detection result. If the accessibility detection result is true, the test point and test direction are added to the test set. If the accessibility detection result is false, but the accessibility detection result is true along the opposite direction of the test direction, the opposite direction of the test direction is taken as the test direction, and the test point and test direction are added to the test set.

[0081] It should be noted that a true reachability test result indicates that there is no interference between the virtual laser beam and the test point, and the virtual laser beam can reach the test point along the test direction, so the test point can be tested by laser vibration measurement; a false reachability test result indicates that there is interference between the virtual laser beam and the test point, and the virtual laser beam cannot reach the test point along the test direction, so the test point cannot be tested by laser vibration measurement.

[0082] In this embodiment, after determining the test point and its corresponding test direction, it is also necessary to determine whether the laser can reach the test point along the test direction, that is, whether the test point can be tested using a laser vibrometer. For a specific test point, if the virtual laser beam cannot reach the test point along the test direction, but can reach the test point along the opposite direction of the test direction, then the opposite direction of the test direction can be used as the test direction for vibration testing, and the laser vibrometer direction can be used for testing.

[0083] Optionally, the virtual laser beam can be generated in the form of plot cells. By checking whether the virtual laser beam interferes with the two-dimensional or three-dimensional structure of the tested structure, it can be determined whether the virtual laser beam can reach the test point. Specifically, such as... Figure 3 As shown, when the two nodes of the virtual laser beam X are located on both sides of the plane formed by the two-dimensional structure D1, the virtual laser beam X interferes with the two-dimensional structure D1; when the two nodes of the virtual laser beam are located on both sides of any plane of the three-dimensional structure D2, it indicates that the virtual laser beam X interferes with the three-dimensional structure D2.

[0084] Furthermore, if the reachability test results are false both along the test direction and in the opposite direction, the vibration test method includes:

[0085] A target test point is searched within a preset area around the test point; wherein the target test point satisfies the following conditions: parallel to the test direction, and the reachability detection result is true; the target test point is used as the test point, and the test point and test direction are added to the test set. In this embodiment, if the virtual laser beam cannot reach the test point, a target test point can be found within the preset area around the test point, and the target test point is used to replace the test point to perform vibration testing on the target test point.

[0086] In this embodiment, the test point is determined to be able to be tested by laser vibration measurement. For test points that cannot be tested by laser vibration measurement, the target test point is tested by automatically searching for the target test point, which ensures the feasibility of the test plan and guarantees more comprehensive and accurate test results.

[0087] According to one embodiment of the present invention, the preset region is the region corresponding to points whose amplitude and the amplitude of the test point are within a preset difference. The method for searching for a target test point within the preset region around the test point includes:

[0088] Based on the test point, a replacement test point is determined; wherein, the replacement test point is located in a preset direction of the test point and at a preset distance from the test point; if the replacement test point satisfies the following conditions: parallel to the test direction and the accessibility detection result is true, the replacement test point is used as the target test point; if the replacement test point satisfies the accessibility detection result as false, a replacement test point is re-determined in the preset area until the replacement test point satisfies the accessibility detection result as true, or until the preset area is completely searched.

[0089] Specifically, within the test area, the point after moving the test point a preset distance in a preset direction is used as a replacement test point. The test direction of the replacement test point is determined, and it is judged whether the virtual laser beam can reach the replacement test point along a direction parallel to the test direction. If the virtual laser beam can reach the replacement test point, then the test point is used as the target test point. If the virtual laser beam cannot reach the replacement test point, then within the preset area, the point after moving the replacement test point a preset distance in a preset direction is used as the replacement test point again, until the next replacement test point is found. The replacement test point satisfies the reachability detection result as true, or until the preset area is completely searched.

[0090] In one optional implementation, the boundary line of the preset area can be a contour line with a preset ratio to the amplitude of the test point. For example, the amplitude of the point on the boundary line of the test area is 80% of the amplitude of the test point. Optionally, the preset ratio can also be 90% or other values. This embodiment does not make specific limitations.

[0091] According to one embodiment of the present invention, if none of the points in the preset area meet the accessibility detection result of true, that is, none of the points in the preset area can be tested by laser vibration measurement, the test point and the corresponding test direction are added to the risk point set and the tester is prompted. The tester can then take other feasible test methods to test the test points in the risk point set, so as to avoid missing the test points that need to be tested on the structure under test and ensure that the vibration test results are more comprehensive and accurate.

[0092] According to one embodiment of the present invention, laser vibration testing is performed on the test point according to the test direction to obtain test results, including:

[0093] The test points in the test set are sorted based on the test point parameters to obtain the sorted test set; the test point parameters include the test direction and the coordinates of the test points; according to the sorted order of the test set, the test points are subjected to laser vibration tests in sequence according to the test direction.

[0094] After accessibility testing of the test points and their corresponding test directions, a test set is obtained. It's understood that the test points in this set are initially unordered. During testing, the test points need to be sorted. Specifically, this can be done based on the test direction and the coordinates of the test points. The coordinates of the test points can include both their horizontal and vertical coordinates. This allows the laser vibrometer to test the points sequentially, avoiding repeated adjustments to the laser vibrometer's position during the test. This saves vibration testing time and prevents errors caused by manually adjusting the laser vibrometer's position, thus improving test accuracy.

[0095] According to one embodiment of the present invention, the test points in the test set are sorted based on test point parameters to obtain a sorted test set, including:

[0096] The test set is sorted according to the first sorting rule to obtain the first sorted set; the first sorting rule is the sorting rule for test points based on the test direction.

[0097] The first sorted set is sorted a second time according to the second sorting rule to obtain the second sorted set. The second sorting rule is a sorting rule that sorts test points in the same test direction based on the height of the test points.

[0098] The second sorted set is sorted three times according to the third sorting rule to obtain the third sorted set; the third sorting rule is a sorting rule based on the horizontal coordinate of the test point to sort test points with the same test direction and the same test height.

[0099] Use the third sorted set as the sorted test set.

[0100] Understandably, in this embodiment, when sorting the test points in the test set, they are first sorted according to the test direction, which distinguishes between positive and negative (i.e., X-axis, Y-axis, and Z-axis). Test points in the same test direction are first categorized and sorted to obtain a first sorted set. Then, the test points in the first sorted set are sorted according to their height, for example, from high to low or from low to high, to obtain a second sorted set. Finally, the second sorted set is sorted according to the horizontal coordinates of the test points, for example, from left to right or from right to left, to obtain a third sorted set, which is the sorted test set. During testing, the position of the laser vibrometer can be adjusted sequentially according to the test order, reducing the number of adjustments required and avoiding the increased measurement error caused by repeated adjustments, thus improving test accuracy.

[0101] According to one embodiment of the present invention, after performing laser vibration testing on the test point according to the test direction and obtaining the test result, the method further includes:

[0102] The test results are processed to obtain the response parameter information of the tested structure; the response parameter information includes at least one of acceleration information, velocity information, and displacement information. After obtaining the test results, the test results can be processed, including but not limited to windowing, filtering, and Fourier transform, to obtain at least one of the peak acceleration, peak velocity, peak displacement, or acceleration frequency response curve of the tested results. Combined with the test results of the risk point set, a test report of the tested structure is formed.

[0103] According to one embodiment of the present invention, such as Figure 4 As shown, the vibration testing method may further include: establishing a simulation model of the structure under test and performing modal analysis on the simulation model; identifying risk points that need attention and determining their test directions; performing an interference check on each risk point, i.e., determining whether there is interference between the virtual laser beam and the risk point; if the risk point can pass the interference check, then outputting the test point and test direction; if the risk point cannot pass the interference check along the test direction, then changing the test direction and continuing the interference check; if it still cannot pass the interference check, then searching for a replacement test point in a preset area around the risk point for interference check; if there is no test point that can pass the interference check in the preset area around the risk point, then deleting the test point and indicating the risk; then sorting the test points that pass the interference check according to the above sorting rules; after sorting, performing vibration tests on the test points in sequence, and processing the test results to form the final test report.

[0104] The following example illustrates the application of the above vibration testing method to a certain pipeline:

[0105] Figure 5 The diagram shows the structure of the pipeline. The pipeline is then discretized and modeled to obtain the following results: Figure 6 In the simulation model shown, if two test points are determined according to the vibration testing method described above, and their test directions are both along the positive X-axis, then test point A has no interference in the positive X-axis direction, the virtual laser beam can reach test point A, and test point A can be tested using a laser vibrometer. Test point B has interference in both the positive and negative X-axis directions, making it impossible to test point B using a laser vibrometer. Instead, a target test point can be found within a preset area around test point B for testing. For example... Figure 7As shown, if there is interference at test point C in its test direction, a target test point M is searched within a preset area around test point B. The boundary line of the preset area is the 80% amplitude contour line E. A target test point M without interference is found within this preset area, and the target test point M is tested using a laser vibrometer.

[0106] The testing method provided in this embodiment discretizes and models the structure under test to establish a simulation model; modal analysis is performed on the simulation model to determine modal parameters, including natural frequencies and mode shapes; based on the modal parameters, test points and their corresponding test directions are determined; and laser vibration testing is conducted on the test points according to the test directions to obtain the test results. By performing modal analysis on the simulation model of the structure under test to obtain natural frequencies and mode shapes, and automatically selecting the test points and determining their test directions based on these parameters, the method avoids the need for testers to manually select test points based on experience, which could lead to vibration test results that fail to accurately and comprehensively reflect the true vibration state of the structure under test, thus improving the accuracy of the test results.

[0107] Another embodiment of the present invention provides a vibration testing system, such as... Figure 8 As shown, it includes:

[0108] Model building module 801 is used to discretize and model the structure under test and build a simulation model;

[0109] Analysis module 802 is used to perform modal analysis on the simulation model and determine the modal parameters;

[0110] The determination module 803 is used to determine the test points and test directions based on modal parameters;

[0111] Test module 804 is used to perform laser vibration tests on test points according to the test direction and obtain test results.

[0112] Optionally, it also includes a data processing module for processing the test results to obtain response parameter information of the tested structure; the response parameter information includes at least one of acceleration information, velocity information, and displacement information.

[0113] It is understood that the functions of each module in this vibration testing system correspond to those in the above method embodiments. If the vibration testing method has the beneficial effects of the above embodiments, then the vibration testing system also has the above beneficial effects, which will not be elaborated in this embodiment.

[0114] The vibration testing system provided in this embodiment of the invention realizes part of the vibration testing process through virtual simulation and the other part through physical objects such as laser vibrometers. The laser vibrometer is the main instrument and has the advantages of no added mass, accurate measurement results, and wide applicability. It combines the advantages of simulation and experimentation and complements the disadvantages of both, thereby minimizing the testing time and cost.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of this application.

Claims

1. A vibration testing method, characterized in that, include: Discretize and model the structure under test to establish a simulation model; Modal analysis was performed on the simulation model to determine the modal parameters; The modal parameters include natural frequencies and mode shapes; Based on the modal parameters, the test point and the corresponding test direction are determined, including: Based on the modal parameters, the target natural frequency order is determined; points with amplitudes greater than a preset amplitude threshold are selected from the natural frequency orders as test points; based on the amplitude components of the test points in a preset three-dimensional direction, the test direction is determined, wherein the amplitude component corresponding to the test direction is greater than the amplitude component corresponding to other directions; According to the test direction, laser vibration test is performed on the test point to obtain the test results; Before performing laser vibration testing on the test point according to the test direction, the method includes: For each test point, a simulated laser beam is generated by the simulation unit along the test direction; Based on the simulated laser beam, accessibility detection is performed on the test point to obtain the accessibility detection result; If the reachability detection result is true, the test point and the test direction are added to the test set; If the reachability detection result is false, but the reachability detection result is true in the opposite direction of the test direction, the opposite direction of the test direction is taken as the test direction, and the test point and the test direction are added to the set to be tested.

2. The vibration testing method according to claim 1, characterized in that, If the reachability detection result is false both along the test direction and in the opposite direction, the method includes: Search for a target test point within a preset area around the test point; wherein the target test point satisfies the following conditions: it is parallel to the test direction, and the reachability detection result is true; The target test point is used as the test point, and the test point and the test direction are added to the set to be tested.

3. The vibration testing method according to claim 2, characterized in that, The preset region is the region corresponding to points whose amplitude is within a preset difference from the amplitude of the test point. The step of searching for a target test point within the preset region surrounding the test point includes: Based on the test point, a replacement test point is determined; wherein the replacement test point is located in a preset direction of the test point, and the replacement test point is at a preset distance from the test point; If the replacement test point satisfies the following conditions: it is parallel to the test direction and the reachability detection result is true, then the replacement test point shall be used as the target test point. If the reachability detection result is false when the replacement test point is obtained, the replacement test point is re-determined in the preset area until the replacement test point is true when the reachability detection result is obtained, or until the preset area is completely searched.

4. The vibration testing method according to claim 3, characterized in that, The method further includes: If none of the points within the preset area satisfy the condition that the reachability detection result is true, the test point and the test direction are added to the risk point set and a warning is issued.

5. The vibration testing method according to claim 2, characterized in that, The step of performing laser vibration testing on the test point according to the test direction to obtain test results includes: The test points in the set to be tested are sorted based on the test point parameters to obtain a sorted set to be tested; the test point parameters include the test direction and the coordinates of the test points. According to the sorted order of the test set, and according to the test direction, the test points are subjected to laser vibration tests in sequence.

6. The vibration testing method according to claim 5, characterized in that, The process of sorting the test points in the test set based on test point parameters to obtain a sorted test set includes: The test set is sorted once according to the first sorting rule to obtain the first sorted set; the first sorting rule is the sorting rule for the test points based on the test direction; The first sorted set is sorted a second time according to the second sorting rule to obtain the second sorted set. The second sorting rule is a sorting rule that sorts the test points with the same test direction based on the height of the test point. The second sorted set is sorted three times according to the third sorting rule to obtain the third sorted set; the third sorting rule is a sorting rule that sorts the test points with the same test direction and the same test height based on the horizontal coordinate of the test point. The third sorted set is used as the sorted test set.

7. The vibration testing method according to any one of claims 1 to 6, characterized in that, After performing laser vibration testing on the test point according to the test direction and obtaining the test results, the method further includes: The test results are processed to obtain the response parameter information of the tested structure; the response parameter information includes at least one of acceleration information, velocity information, and displacement information.

8. A vibration testing system, characterized in that, include: The model building module is used to discretize and model the structure under test and build a simulation model. The analysis module is used to perform modal analysis on the simulation model and determine the modal parameters; The determination module is used to determine the test points and test directions based on the modal parameters; The testing module is used to perform laser vibration testing on the test point according to the test direction and obtain the test results; Based on the modal parameters, the target natural frequency order is determined; points with amplitudes greater than a preset amplitude threshold are selected from the natural frequency orders as test points. The test direction is determined based on the amplitude components of the test point in a preset three-dimensional direction, wherein the amplitude component corresponding to the test direction is greater than the amplitude components corresponding to other directions. Before performing laser vibration testing on the test point according to the test direction, For each test point, a simulated laser beam is generated by a simulation unit along the test direction; based on the simulated laser beam, accessibility detection is performed on the test point to obtain an accessibility detection result; if the accessibility detection result is true, the test point and the test direction are added to the test set; if the accessibility detection result is false, but the accessibility detection result is true along the opposite direction of the test direction, the opposite direction of the test direction is taken as the test direction, and the test point and the test direction are added to the test set.

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