Fatigue performance evaluation method and device of container based on test data

Abstract

The invention discloses a fatigue performance evaluation method and device for a container based on test data. The method comprises the steps that the angular seat acceleration of the container and a flexible body modal set of the container are obtained, and the flexible modal set is used for representing the natural vibration characteristic of the structural response of the flexible body of the container when the flexible body of the container is subjected to external force; performing frequency domain integration on the angular seat acceleration to obtain angular seat displacement of the container; the angle seat displacement is input into a dynamic simulation test system, the dynamic stress of the target welding seam of the container is obtained, and the dynamic simulation test system is obtained by connecting a flexible body modal set and a pre-trained container dynamic simulation test bed; based on the fatigue life curve and the dynamic stress, a fatigue performance evaluation result of the container is obtained, and the fatigue performance evaluation result is used for representing whether the damage value of the container meets a preset standard or not. The technical problem of low accuracy of evaluating the fatigue performance of the container in related technologies is solved.

Description

Technical Field

[0001] The present invention relates to the field of transportation, and in particular to a method and device for evaluating fatigue performance of a container based on test data. Background Art

[0002] With the development of multimodal transport in recent years, the frequency of container use has increased, and the operating conditions have become more complex, resulting in frequent container fatigue problems. Especially in railway transportation, containers are easily disturbed by external vibrations, which can cause damage to containers and affect the safety of container use. In particular, when containers are used to transport dangerous goods, serious transportation safety accidents may occur. Therefore, fatigue performance analysis of containers is required to ensure normal container transportation.

[0003] However, related technologies usually rely on human experience to design simulation calculations and experiments, which are prone to defects such as over-design or under-design, resulting in low accuracy in evaluating container fatigue performance.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method and device for evaluating the fatigue performance of a container based on test data, so as to at least solve the technical problem of low accuracy in evaluating the fatigue performance of a container in the related art.

[0006] According to one aspect of an embodiment of the present invention, a performance evaluation method for a container is provided, comprising: obtaining corner seat accelerations of a container and a flexible body modal set of a container, wherein the corner seat accelerations are accelerations of four corner seats of the container, the corner seat accelerations are obtained through experiments, and the flexible modal set is used to characterize the inherent vibration characteristics of the structural response of a flexible body of the container when the flexible body is subjected to external forces; integrating the corner seat accelerations in the frequency domain to obtain the corner seat displacements of the container, wherein the corner seat displacements are used to characterize the displacements of the four corner seats of the container, and the corner seat displacements include displacements in multiple directions; inputting the corner seat displacements into a dynamic simulation test system to obtain the dynamic stress of a target weld of the container, wherein the dynamic simulation test system is obtained by connecting a flexible body modal set and a pre-trained dynamic simulation test bench for a container, and the dynamic simulation test system at least includes cylinders in multiple directions, and the target weld is used to characterize the weld on the container that bears the load; obtaining a fatigue performance evaluation result of the container based on a fatigue life curve and dynamic stress, wherein the fatigue performance evaluation result is used to characterize whether the damage value of the container meets a preset standard.

[0007] Optionally, obtaining the corner seat acceleration of the container includes one of the following: obtaining the corner seat acceleration of the container based on a line operation dynamic response test, wherein the test conditions of the line operation dynamic response test need to cover the actual driving environment of the vehicle loaded with the container; obtaining the corner seat acceleration of the container through an indoor vehicle vibration test bench.

[0008] Optionally, before obtaining the flexible body modal set of the container, the above method also includes: performing plate and shell unit modeling on the box body of the container to obtain a first modeling; establishing four rigid zones for the four corner seats respectively, and performing small mass unit modeling on the four rigid zones to obtain multiple second modelings; summarizing the first modeling and the multiple second modelings to obtain a finite element modeling of the container, wherein the finite element modeling is a physical representation of the container; establishing a coordinate system based on the finite element modeling of the container to obtain the rigid body generalized coordinates of the container, wherein the rigid body generalized coordinates are used to describe the position and posture of the container in three-dimensional space.

[0009] Optionally, obtaining the flexible body modal set of the container includes: adding modal coordinates to the rigid body generalized coordinates of the container to obtain the flexible generalized coordinates of the container, wherein the modal coordinates are used to characterize the vibration modes of the container at different frequencies; and obtaining the flexible body modal set of the container based on the target modal synthesis method and the flexible generalized coordinates.

[0010] Optionally, the diagonal seat acceleration is integrated in the frequency domain to obtain the angular seat displacement of the container, including: performing a discrete Fourier transform on the diagonal seat acceleration to obtain a simple harmonic signal of the acceleration; integrating the simple harmonic signal according to a preset number of integrations to obtain harmonics of the angular seat displacement; and superimposing the harmonics based on a preset signal processing method to obtain the angular seat displacement.

[0011] Optionally, the angular displacement is input into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, including: taking the displacement in different directions as the initial driving displacement of the cylinder in the corresponding direction, and testing the container based on a preset load step to obtain virtual accelerations in multiple directions, wherein the preset load step is the load step of the sampling frequency; obtaining the difference between the acceleration in different directions and the virtual acceleration in the corresponding direction to obtain the difference in multiple directions; in response to the difference in multiple directions being less than the preset threshold of the corresponding direction, extracting the dynamic stress of the target weld.

[0012] Optionally, the above method also includes: determining a target difference among multiple differences, wherein the target difference is greater than a preset threshold value; adjusting the initial driving displacement of the cylinder in the direction corresponding to the target difference to obtain the adjusted initial driving displacement of the cylinder in the direction corresponding to the target difference; repeating the steps of driving the container based on the preset load step and the adjusted initial displacement to obtain virtual accelerations in multiple directions, and obtaining differences in multiple directions based on the virtual accelerations in multiple directions and accelerations in different directions, until the differences in multiple directions are all less than the preset threshold value in the corresponding direction.

[0013] Optionally, based on the fatigue life curve and dynamic stress, a fatigue performance evaluation result of the container is obtained, including: statistics on the range and number of cycles of the dynamic stress to obtain initial statistical results; and calculation of the initial statistical results based on the fatigue life curve to obtain fatigue performance evaluation results.

[0014] Optionally, the above method also includes: in response to the damage value being greater than or equal to a preset threshold, determining that the fatigue performance evaluation result is that the damage value does not meet the preset standard; in response to the damage value being less than a preset threshold, determining that the fatigue performance evaluation result is that the damage value meets the preset standard.

[0015] According to another aspect of an embodiment of the present invention, a performance evaluation device for a container is also provided, including: an acquisition module, used to acquire the corner seat acceleration of the container and the flexible body modal set of the container, wherein the corner seat acceleration is the acceleration of the four corner seats of the container, the corner seat acceleration is obtained through experiments, and the flexible modal set is used to characterize the inherent vibration characteristics of the structural response of the container flexible body when the container flexible body is subjected to external force; a first processing module, used to perform frequency domain integration of the corner seat acceleration to obtain the corner seat displacement of the container, wherein the corner seat displacement is used to characterize the displacement of the four corner seats of the container, and the corner seat displacement includes: displacement in multiple directions; an input module, used to input the corner seat displacement into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, wherein the dynamic simulation test system is obtained by connecting the flexible body modal set and a pre-trained container dynamic simulation test bench, and the dynamic simulation test system at least includes: cylinders in multiple directions, and the target weld is used to characterize the weld on the container that bears the load; a second processing module, used to obtain the fatigue performance evaluation result of the container based on the fatigue life curve and the dynamic stress, wherein the fatigue performance evaluation result is used to characterize whether the damage value of the container meets the preset standard.

[0016] According to another aspect of an embodiment of the present invention, there is further provided an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein the method in each embodiment of the present invention is executed when the program is running.

[0017] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium includes a stored executable program, wherein when the executable program is running, the device where the computer-readable storage medium is located is controlled to execute the methods in various embodiments of the present invention.

[0018] According to another aspect of an embodiment of the present invention, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the method in each embodiment of the present invention is implemented.

[0019] According to another aspect of an embodiment of the present invention, a computer program product is provided, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method in each embodiment of the present invention is implemented.

[0020] According to another aspect of the embodiments of the present invention, a computer program is further provided. When the computer program is executed by a processor, the methods in the embodiments of the present invention are implemented.

[0021] In an embodiment of the present invention, the corner seat acceleration and the flexible body modal set of the container are obtained; the corner seat acceleration is integrated in the frequency domain to obtain the corner seat displacement of the container; the corner seat displacement is input into the dynamic simulation test system to obtain the dynamic stress of the target weld of the container; based on the fatigue life curve and the dynamic stress, the fatigue performance evaluation result of the container is obtained, so as to accurately evaluate the fatigue performance of the container. It is easy to notice that by obtaining the corner seat acceleration and the flexible body modal set of the container, and converting the corner seat acceleration into the corner seat displacement, it is convenient to perform dynamic tests. The dynamic stress is further obtained by the dynamic simulation test system, which is obtained by connecting the flexible body modal set and the pre-trained container dynamic simulation test bench, so that the dynamic simulation test system can perform simulation experiments through the container dynamic simulation test bench, accurately simulate the dynamic response of the container, thereby ensuring the consistency of the virtual test data and the test data, so that the test process is more in line with the actual working conditions, so that the fatigue performance evaluation result of the container obtained based on the fatigue life curve and the dynamic stress is more accurate, and the purpose of the dynamic test is achieved, thereby achieving the technical effect of improving the accuracy of evaluating the fatigue performance of the container, and thus solving the technical problem of low accuracy in evaluating the fatigue performance of the container in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1is a flow chart of a method for evaluating fatigue performance of a container based on test data according to an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a container corner seat according to an embodiment of the present invention;

[0025] Figure 3 is a structural diagram of a virtual container test bench according to an embodiment of the present invention;

[0026] FIG. 4( a ), FIG. 4( b ), FIG. 4( c ) and FIG. 4( d ) are schematic diagrams of an operation interface of a virtual container test bench according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of an optional method for evaluating fatigue performance of a container based on test data according to an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of a fatigue performance evaluation device for a container based on test data according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] According to an embodiment of the present invention, an embodiment of a method for evaluating fatigue performance of a container based on test data is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 FIG. 1 is a flow chart of a method for evaluating fatigue performance of a container based on test data according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0033] Step S102, obtaining the corner seat acceleration of the container and the flexible body modal set of the container.

[0034] Among them, the corner seat acceleration is the acceleration of the four corner seats of the container, and the corner seat acceleration is obtained through experiments. The flexible mode set is used to characterize the inherent vibration characteristics of the structural response of the container flexible body when the container flexible body is subjected to external force.

[0035] The above-mentioned container can be a container used in railway transportation conditions, or a container used in road or water transportation conditions. The container can also be a container loaded with different products, such as a refrigerated container, a dangerous goods container, etc., or an empty container. Generally, the container is made of metal, such as steel. In the actual transportation process, especially railway transportation, the container will be subjected to dynamic loads, such as vibration, impact, etc. These loads will cause the container structure to deform, thereby generating stress and strain. Therefore, when analyzing the performance of the container, its internal structure and its deformation need to be considered. Based on this, the container is regarded as a flexible body that can be deformed. By modeling the internal structure of the container, the dynamic response of the container during transportation is accurately simulated, which is convenient for the subsequent performance evaluation of the container. The internal structure of the container includes but is not limited to plate and shell units, weld processing, mass units, etc. Such a model can more realistically reflect the stress distribution and fatigue damage of the container under dynamic loads, thereby improving the accuracy and reliability of the container performance evaluation.

[0036] The above-mentioned corner seat acceleration can be the acceleration of the four corner seats of the container. The corner seat acceleration can be obtained through experiments. The size and frequency characteristics of the dynamic load acting on the container can be reflected through the corner seat acceleration. The corner seat acceleration can be used to analyze the response of the container structure under the action of dynamic load. By converting the corner seat acceleration to displacement, the stress and strain distribution of the structure can be further calculated to obtain the dynamic stress that the container can withstand and whether these stresses may cause fatigue cracks in the container. Therefore, the corner seat acceleration is the basis for evaluating the fatigue performance of the container and subsequent structural optimization. Optionally, the corner seat acceleration of the container can be obtained through line operation dynamic response testing or indoor vehicle vibration test bench, so as to simulate the operation status of the container under different route conditions and improve the accuracy of the analysis.

[0037] The above-mentioned flexible modal set can be used to characterize the inherent vibration characteristics of the structural response of the container flexible body when the container flexible body is subjected to external force. The inherent vibration characteristics may include but are not limited to one of the following: modal frequency, modal vibration shape, damping ratio, which are not limited here. For example, taking the loaded state of the tank container as an example, the modal vibration shape may include: lateral unidirectional bending of the upper side beam, vertical unidirectional bending of the upper side beam, lateral reverse bending of the upper side beam, vertical reverse bending of the lower side beam, etc., which are not limited this time. Optionally, the flexible body mode of the container can be calculated by the modal comprehensive analysis method. The flexible modal set can be used to predict the vibration response of the container when it is subjected to a dynamic load of a specific frequency. By performing dynamic simulation through the flexible modal set, the dynamic stress cycle of the container can be extracted, and then the performance evaluation can be performed to obtain the damage condition of the container.

[0038] In an optional embodiment, the acceleration of the corner seats of the container can be collected by installing acceleration sensors at the four corner seats of the container, and the flexible body mode of the container can be calculated by the modal comprehensive analysis method. In another optional embodiment, the corner seat acceleration can be obtained by constructing a simulation experiment to simulate the response of the container under dynamic load, and the flexible body mode of the container can be calculated by the modal comprehensive analysis method. Optionally, the corner seat acceleration of the container can be obtained by line operation dynamic response test or indoor vehicle vibration test bench.

[0039] Step S104, frequency domain integration of the corner seat acceleration is performed to obtain the corner seat displacement of the container.

[0040] The corner seat displacement is used to characterize the displacement of the four corner seats of the container, and the corner seat displacement includes displacement in multiple directions.

[0041] The above-mentioned angular seat displacement can be used to characterize the displacement of the four corner seats of the container. The angular seat displacement may include displacements in multiple directions. For example, the multiple directions here may include but are not limited to: vertical direction, lateral direction, longitudinal direction, etc., which are not limited here and can be determined as needed. In order to analyze the vibration characteristics of the container, the angular seat displacement can be obtained by frequency domain integration. The angular seat displacement can be used to analyze the stress condition and dynamic response of the container during dynamic simulation of the container. The angular seat displacement can also be used in an indoor vehicle vibration test bench. The displacement of the internal structure of the container can be obtained through dynamic simulation, and then the stress distribution of the internal structure of the container can be calculated, which is convenient for identifying stress areas, evaluating the fatigue strength of welds, and predicting the damage of containers.

[0042] In an optional embodiment, the acceleration can be integrated in the frequency domain using a frequency domain integration method to determine the angular displacement of the container. Optionally, the acceleration in the frequency domain can be processed by a transfer function. Alternatively, the acceleration can be integrated in the frequency domain by a conversion model to determine the angular displacement of the container. Alternatively, the angular acceleration can be first subjected to a discrete Fourier transform to obtain a simple harmonic signal of the acceleration, and then the simple harmonic signal can be integrated according to a preset number of integrations to obtain the harmonics of the angular displacement, so that the harmonics can be superimposed by a signal processing method to obtain the angular displacement.

[0043] Step S106, inputting the angular displacement into the dynamic simulation test system to obtain the dynamic stress of the target weld of the container.

[0044] The dynamic simulation test system is obtained by connecting the flexible body modal set and the pre-trained container dynamic simulation test bench. The dynamic simulation test system at least includes: cylinders in multiple directions, and the target weld is used to characterize the weld on the container that bears the load.

[0045] The above-mentioned dynamic simulation test system can be obtained by connecting the flexible body modal set and the pre-trained container dynamic simulation test bench, so as to perform dynamic simulation analysis on the virtual container through the dynamic simulation test system to obtain the dynamic stress of the target weld of the container.

[0046] The above virtual container can be used to reflect the physical characteristics and internal structure of the real container. Through the virtual container, the performance of the container under different loads and working conditions can be evaluated.

[0047] The above-mentioned dynamic simulation test system may at least include: multiple-directional oil cylinders to facilitate determination of the angular displacement of the oil cylinders in different directions in the corresponding directions, thereby improving the accuracy of the simulated container. By conducting virtual experimental tests on virtual containers, various working conditions can be simulated, such as extreme climates, terrains, etc., and the test conditions and indicators can also be precisely controlled to accurately analyze the dynamic stress of the target weld of the container.

[0048] The above-mentioned target welds can be used to characterize the welds on the container that bear the load, especially the welds that are prone to stress concentration or fatigue cracks under dynamic loads. For example, these welds may be interfaces connecting key components, such as the connection between the tank body and the frame, or areas that experience frequent repeated loads and deformation. Therefore, by evaluating the target welds of the container, the damage of the container can be determined. The above-mentioned dynamic stress can be the stress of the container's weld structure that changes over time under the influence of dynamic loads such as vibration, impact, pressure fluctuations, etc.

[0049] In an optional embodiment, a structural analysis method can be used to analyze the dynamic stress of the target weld of the container. Generally, the response of the container under dynamic displacement is calculated based on the flexible body modal set and the applied boundary conditions, and the dynamic stress response of the target weld is recorded so that the dynamic stress can be converted into fatigue life prediction using fatigue assessment software or tools later. In another optional embodiment, a virtual acceleration can be obtained based on the displacement, and the dynamic stress of the target weld can be extracted based on the acceleration in different directions.

[0050] Step S108, obtaining a fatigue performance evaluation result of the container based on the fatigue life curve and the dynamic stress.

[0051] Among them, the fatigue performance evaluation results are used to characterize whether the damage value of the container meets the preset standards.

[0052] The above fatigue life curve is also often referred to as the stress-life curve (Stress-Number of cycles to failure curve, referred to as SN curve), which can be used to predict the fatigue life of containers under cyclic loads. In this curve, S represents stress, usually the stress amplitude, and N represents the number of cycles until fatigue cracks or failure occur in the container. The basic principle of the fatigue life curve is: under a preset stress level, the container can withstand load cycles without fatigue failure. When the stress level increases, the number of cycles that the container can withstand will decrease, and vice versa. At the first stress level, the container may be able to withstand an unlimited number of cycles without failure. This first stress level can be used to characterize the fatigue limit or endurance limit of the container. Through the fatigue life curve, the number of cycles corresponding to the dynamic stress can be determined, thereby determining the damage to the container in order to evaluate the performance of the container.

[0053] The above fatigue performance evaluation results can be used to characterize whether the damage value of the container meets the preset standard. The damage condition of the container is determined through the fatigue performance evaluation results, so as to facilitate the subsequent maintenance of the container. The above damage value can be used to characterize the fatigue life of the container. The damage value of the container can be determined through the fatigue life curve to evaluate the performance of the container. The above preset standard can be used to characterize the damage value of the normal operation of the container. When the preset standard is met, the container can be put into use, otherwise the container needs to be repaired.

[0054] In an optional embodiment, the fatigue performance evaluation result of the container can be analyzed by an identification model. Specifically, the fatigue life curve and the dynamic stress can be input into the identification model, and the output value of the identification model can be that the damage value of the container meets the preset standard or the damage value of the container does not meet the preset standard. The identification model can be one of the following: support vector machine, random forest, which is not limited here, and the identification model can be determined as needed.

[0055] In another optional embodiment, the range and cycle number of dynamic stress can be counted by rain flow counting to obtain initial statistical results, and the initial statistical results can be further calculated based on the fatigue life curve to obtain fatigue performance evaluation results.

[0056] In an embodiment of the present invention, the corner seat acceleration and the flexible body modal set of the container are obtained; the corner seat acceleration is integrated in the frequency domain to obtain the corner seat displacement of the container; the corner seat displacement is input into the dynamic simulation test system to obtain the dynamic stress of the target weld of the container; based on the fatigue life curve and the dynamic stress, the fatigue performance evaluation result of the container is obtained, so as to accurately evaluate the fatigue performance of the container. It is easy to notice that by obtaining the corner seat acceleration and the flexible body modal set of the container, and converting the corner seat acceleration into the corner seat displacement, it is convenient to perform dynamic tests. The dynamic stress is further obtained by the dynamic simulation test system, which is obtained by connecting the flexible body modal set and the pre-trained container dynamic simulation test bench, so that the dynamic simulation test system can perform simulation experiments through the container dynamic simulation test bench, accurately simulate the dynamic response of the container, thereby ensuring the consistency of the virtual test data and the test data, so that the test process is more in line with the actual working conditions, so that the fatigue performance evaluation result of the container obtained based on the fatigue life curve and the dynamic stress is more accurate, and the purpose of the dynamic test is achieved, thereby achieving the technical effect of improving the accuracy of evaluating the fatigue performance of the container, and thus solving the technical problem of low accuracy in evaluating the fatigue performance of the container in the related technology.

[0057] Optionally, obtaining the corner seat acceleration of the container includes one of the following: obtaining the corner seat acceleration of the container based on a line operation dynamic response test, wherein the test conditions of the line operation dynamic response test need to cover the actual driving environment of the vehicle loaded with the container; obtaining the corner seat acceleration of the container through an indoor vehicle vibration test bench.

[0058] The above-mentioned line operation dynamic response test can reflect the different environments encountered by the transport vehicles loaded with containers in actual operation, such as Class I, Class II and Class III lines in the railway technical regulations, or different line sections, which may involve straight sections, humps, curved sections and siding switches.

[0059] The indoor vehicle vibration test bench can be a test device used to simulate the load environment encountered by containers in actual use. The indoor vehicle vibration test bench generates vibrations by mechanical, hydraulic or electric means to evaluate the strength, rigidity and stability of the internal structure of the container, thereby facilitating the prediction of the performance and life of the container under real operating conditions.

[0060] In an optional embodiment, the acceleration of the corner seats can be obtained through line operation dynamic response test or indoor vehicle vibration test bench test to obtain the dynamic response data of the container during transportation, thereby reflecting the actual situation and improving the reliability and practicality of subsequent evaluation results. Optionally, vertical, lateral and longitudinal accelerometers can be arranged at the four corner seats of the container to obtain the acceleration of the four corner seats, such as Figure 2 As shown, the four corner seats of the container, obtain the acceleration of these four corner seats.

[0061] Optionally, before obtaining the flexible body modal set of the container, the above method also includes: performing plate and shell unit modeling on the box body of the container to obtain a first modeling; establishing four rigid zones for the four corner seats respectively, and performing small mass unit modeling on the four rigid zones to obtain multiple second modelings; summarizing the first modeling and the multiple second modelings to obtain a finite element modeling of the container, wherein the finite element modeling is a physical representation of the container; establishing a coordinate system based on the finite element modeling of the container to obtain the rigid body generalized coordinates of the container, wherein the rigid body generalized coordinates are used to describe the position and posture of the container in three-dimensional space.

[0062] The first modeling mentioned above can be obtained by performing plate and shell unit modeling on the container body.

[0063] The second modeling mentioned above can be obtained by performing small mass unit modeling on the four rigid areas of the container.

[0064] The above finite element modeling can be a physical representation of the container. The finite element modeling can include but is not limited to one of the following: geometric features, material features, etc., which are not limited here and can be determined as needed.

[0065] In an optional embodiment, the container body may first be modeled using plate and shell units to obtain a first model, and rigid zones may be established for the four corner seats, and multiple second models may be obtained using small mass units to model the rigid zones. The first model and multiple second models may be further summarized to obtain a finite element model of the container to physically represent the container. Finite element modeling can more accurately simulate the structural response of the container in actual transportation, facilitate subsequent simulation of the dynamic response of the container, and improve the accuracy of evaluating the service life of the container. Furthermore, the rigid body generalized coordinates of the container are determined by finite element modeling to facilitate the calculation of the flexible body modal set.

[0066] Optionally, obtaining the flexible body modal set of the container includes: adding modal coordinates to the rigid body generalized coordinates of the container to obtain the flexible generalized coordinates of the container, wherein the modal coordinates are used to characterize the vibration modes of the container at different frequencies; and obtaining the flexible body modal set of the container based on the target modal synthesis method and the flexible generalized coordinates.

[0067] The above modal coordinates can be used to characterize the vibration modes of the container at different frequencies, so that the flexible body modal set can reflect the vibration response of the container.

[0068] The above-mentioned target modal synthesis method can be used to construct the modal set of flexible bodies, including the vibration mode shapes of containers.

[0069] In an optional embodiment, in order to facilitate the analysis of the dynamic response of the container, the container can be regarded as a flexible body. Therefore, the flexible generalized coordinates of the container can be obtained by adding the modal coordinates, and then the flexible generalized coordinates can be calculated by the target modal synthesis method to obtain the flexible body modal set. The modal coordinates and the target modal synthesis method can capture the vibration characteristics of the container during transportation, which is suitable for the performance evaluation of the container, especially the performance prediction in a complex vibration environment, and improves the accuracy and efficiency of the evaluation.

[0070] Optionally, the target modal synthesis method may be a Craig-Bampton modal synthesis method, a subspace iteration method, or a hierarchical modal analysis and reduction method.

[0071] When selecting the fixed interface main mode, the modal set of the Craig-Bampton modal synthesis method ensures that the vibration mode of the container is included in the calculated flexible body modal set according to the test results of the line operation dynamic response test. Through the Craig-Bampton modal synthesis method, the container displacement can be converted into a displacement vector, and then the displacement vector is divided into an internal degree of freedom vector and an interface degree of freedom vector, and the stiffness matrix and mass matrix of the container are written in block form.

[0072] Optionally, the above flexible body modal set can be obtained by solving the following formula:

[0073]

[0074] Where u is the displacement of any test point of the container flexible body, [Φ] is the modal set of the flexible body, {ξ} is the modal coordinate, I is the unit matrix, Φ IC is the internal vector set of the fixed mode, Φ IN is the internal vector set constraining the main mode, {ξ C} is the modal coordinate corresponding to the fixed mode, {ξ N} is the modal coordinate corresponding to the constrained main mode.

[0075] Optionally, the angular seat acceleration is integrated in the frequency domain to obtain the angular seat displacement of the container, including: performing a discrete Fourier transform on the angular seat acceleration to obtain a simple harmonic signal of the angular seat acceleration; integrating the simple harmonic signal according to a preset number of integrations to obtain harmonics of the angular seat displacement; and superimposing the harmonics based on a preset signal processing method to obtain the angular seat displacement.

[0076] The simple harmonic signal can be a periodic signal, a sine signal or a cosine signal. The angular seat acceleration can be converted into angular seat displacement by the simple harmonic signal.

[0077] In an optional embodiment, the acceleration can be integrated in the frequency domain using a frequency domain integration method to determine the angular displacement of the container. Specifically, the angular seat acceleration can be first subjected to a discrete Fourier transform to obtain a simple harmonic signal of the acceleration, and then the simple harmonic signal can be integrated according to a preset number of integrations to obtain the harmonics of the angular displacement, and the harmonics can be superimposed by a signal processing method to obtain the angular displacement. Through discrete Fourier transform and signal processing, the angular displacement can be extracted from the angular seat acceleration for use in the dynamic response analysis of the container, especially when evaluating the structural displacement and deformation of the container, the accuracy and reliability of the evaluation can be improved.

[0078] Taking an angle seat test as an example, the angle seat acceleration obtained by the angle seat test is used to generate a sequence a(n), and the sequence a(n) is subjected to discrete Fourier transform.

[0079] Optionally, the simple harmonic signal, circular frequency, amplitude and initial phase angle corresponding to the signal a(k) are obtained by the following formula:

[0080]

[0081] a(t) k =A k cos(ω k t+φ k );

[0082] In the formula, A k is the amplitude, k is the frequency index, a k and b k are the real and imaginary parts of the signal, ω k is the circular frequency, π is the circumference of a circle, πf k is the frequency, φ k is the initial phase angle, arctan is the inverse tangent function, a(t) k is a simple harmonic signal in the time domain, and t is time.

[0083] Optionally, the harmonics of the angular displacement are obtained by integrating the simple harmonic signal using the following formula:

[0084] S(t) k =A sk cos(ω sk t+φ sk );

[0085] φ sk =φ k -π,ω sk =ω k ;

[0086] Where S(t) k = is the harmonic after angular displacement integration, k is the frequency index, t is the time, A sk is the new amplitude, cos is the cosine function, ω sk is the new circular frequency, +φ sk ) is the new initial phase angle, A k is the amplitude, ω k is the circular frequency, φ k is the initial phase angle, and π is the circumference of a circle.

[0087] Optionally, the angular displacement is expressed by the following formula:

[0088]

[0089] Where s(t) is the total displacement, t is the time, k is the frequency index, N is the number of harmonics, and S(t) k is the displacement after the integration of the kth harmonic, A sk is the new amplitude, cos is the cosine function, ω sk is the new circular frequency, φ sk ) is the new initial phase angle.

[0090] Optionally, the Fourier transform is implemented by the following formula:

[0091]

[0092] Where F(s(t)) represents the Fourier transform result of the displacement signal s(t), H E (ω) is the transfer function, F(a(t)) represents the Fourier transform of the acceleration signal a(t), s(t) is the displacement signal, and F -1 is the inverse Fourier transform, a(t) is the acceleration signal, and (ω) is the angular frequency.

[0093] Optionally, the angular displacement is input into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, including: taking the displacement in different directions as the initial driving displacement of the cylinder in the corresponding direction, and testing the container based on a preset load step to obtain virtual accelerations in multiple directions, wherein the preset load step is the load step of the sampling frequency; obtaining the difference between the acceleration in different directions and the virtual acceleration in the corresponding direction to obtain the difference in multiple directions; in response to the difference in multiple directions being less than the preset threshold of the corresponding direction, extracting the dynamic stress of the target weld.

[0094] The above-mentioned preset load step may be a load step of a sampling frequency, which may be determined as required.

[0095] The above oil cylinders are arranged in multiple directions, for example, vertical, horizontal and longitudinal directions. The oil cylinders can drive the container to move and generate displacement and acceleration.

[0096] In an optional embodiment, the container is driven to move by a cylinder, and the container is driven to move in the corresponding direction by cylinders in different directions. At the same time, the container is tested based on a preset load step to obtain virtual accelerations in multiple movement directions. When the difference between the test acceleration and the virtual acceleration in different directions is ensured to be less than a preset threshold, the dynamic stress of the target weld obtained by the virtual dynamic test is extracted to ensure the reliability of the virtual dynamic test.

[0097] Optionally, the above method also includes: determining a target difference among multiple differences, wherein the target difference is greater than a preset threshold value; adjusting the initial driving displacement of the cylinder in the direction corresponding to the target difference to obtain the adjusted initial driving displacement of the cylinder in the direction corresponding to the target difference; repeating the steps of driving the container based on the preset load step and the adjusted initial displacement to obtain virtual accelerations in multiple directions, and obtaining differences in multiple directions based on the virtual accelerations in multiple directions and accelerations in different directions, until the differences in multiple directions are all less than the preset threshold value in the corresponding direction.

[0098] In an optional embodiment, the initial driving displacement can be adjusted by the root mean square error to ensure the consistency of the virtual acceleration and the test acceleration, thereby ensuring the consistency of the dynamic simulation, and repeatedly judging the difference between the test acceleration and the virtual acceleration until the difference between the test acceleration and the virtual acceleration in multiple directions is less than a preset threshold, and extracting the dynamic stress of the target weld, thereby ensuring the consistency of the dynamic test and improving the accuracy of the container-based assessment.

[0099] Optionally, based on the fatigue life curve and dynamic stress, a fatigue performance evaluation result of the container is obtained, including: statistics on the range and number of cycles of the dynamic stress to obtain initial statistical results; and calculation of the initial statistical results based on the fatigue life curve to obtain fatigue performance evaluation results.

[0100] In an optional embodiment, the fatigue life of the container can be evaluated by counting the range and number of cycles of dynamic stress and combining them with the fatigue life curve for calculation. Optionally, rain flow counting can be used to count the dynamic stress range and the number of cycles to obtain initial statistical results, and then the initial statistical results can be combined with the fatigue life curve for fatigue evaluation.

[0101] Optionally, the above method also includes: in response to the damage value being greater than or equal to a preset threshold, determining that the fatigue performance evaluation result is that the damage value does not meet the preset standard; in response to the damage value being less than a preset threshold, determining that the fatigue performance evaluation result is that the damage value meets the preset standard.

[0102] The above-mentioned preset threshold value can be used to determine whether the damage value of the fatigue performance evaluation result meets the preset standard. The preset threshold value can be determined as needed and is not limited here.

[0103] In an optional embodiment, the damage value and the preset threshold value may be compared by a hash function, or by a simple difference, a percentage difference, a variance analysis, a regression analysis, etc. In response to the damage value being greater than or equal to the preset threshold value, the fatigue performance evaluation result is considered to be that the damage value does not meet the preset standard, so as to achieve fatigue performance evaluation of the container. When the damage value is less than the preset threshold value, the fatigue performance evaluation result is determined to be that the damage value meets the preset standard.

[0104] Figure 3 is a structural diagram of a virtual container test bench according to an embodiment of the present invention, such as Figure 3As shown, the container dynamic simulation test bench includes longitudinal actuator 1, longitudinal actuator 2, longitudinal actuator 3, longitudinal actuator 4, flexible corner piece support platform 5, flexible corner piece support platform 6, transverse actuator 7, transverse actuator 8, vertical actuator 9, vertical actuator 10, vertical actuator 11, vertical actuator 12, longitudinal actuator 13, longitudinal actuator 14, longitudinal actuator 15, longitudinal actuator 16, container beam 17, container beam 18, flexible corner piece support platform 19, flexible corner piece support platform 20, support seat 21, support seat 22.

[0105] Longitudinal actuator 1, longitudinal actuator 2, longitudinal actuator 3 and longitudinal actuator 4 are respectively connected to container beam 17 through ball joints (not marked in the figure), and longitudinal actuator 13, longitudinal actuator 14, longitudinal actuator 15 and longitudinal actuator 16 are respectively connected to container beam 18 through ball joints (not marked in the figure).

[0106] The transverse actuator 7 is connected to the container beam 17 via a ball joint (not shown in the figure), and the transverse actuator 8 is connected to the container beam 18 via a ball joint (not shown in the figure).

[0107] The vertical actuator 9 and the vertical actuator 10 are respectively connected to the container beam 17 through a ball joint (not marked in the figure), and the vertical actuator 11 and the vertical actuator 12 are respectively connected to the container beam 18 through a ball joint (not marked in the figure); the vertical actuator 9 and the vertical actuator 10 are respectively connected to the support seat 21 through a ball joint (not marked in the figure), and the vertical actuator 11 and the vertical actuator 12 are respectively connected to the support seat 22 through a ball joint (not marked in the figure).

[0108] In addition, the flexible corner piece support platform 5 and the flexible corner piece support platform 6 are respectively located above the container beam 17, and the flexible corner piece support platform 19 and the flexible corner piece support platform 20 are respectively located above the container beam 18. The flexible corner piece support platform 20 includes a flexible spring 201 and a flexible container connection point 202, and the flexible container connection point can be used to connect the main node of the rigid area of ​​the flexible container.

[0109] The operation interface of the container dynamic simulation test bench is shown in Figure 4(a), Figure 4(b), Figure 4(c) and Figure 4(d). As shown in Figure 4(a), the system dynamics automatic analysis software includes test bench, container, virtual test, results, files, edit, view, create, simulate, evaluate, set, tool and help, with a total of 13 interactive items for users to choose. Among them, the interactive item "test bench" includes existing virtual experiments, existing test benches, new container tests, and adjusting test benches. As shown in Figure 4(b), the interactive item "container" includes flexible bodies, connecting containers to test benches, sensor installation, setting container modes and damping. As shown in Figure 4(c), the interactive item "virtual test" includes typical loads, random loads, and starting tests. As shown in Figure 4(d), the interactive item "results" includes support platform acceleration analysis, container acceleration analysis, container strain analysis, and modal coordinate results.

[0110] Figure 5 is a schematic diagram of an optional method for evaluating the fatigue performance of a container based on test data according to an embodiment of the present invention. Figure 5 As shown in the figure, a finite element model is constructed for the container, and then the flexible body modal set of the container is calculated through the finite element model, and a virtual dynamic test is performed on the flexible body modal set through a virtual container test bench. The acceleration of the container corner seat is obtained through line operation dynamic response test and vibration table test, and the displacement of the container corner seat is further generated based on the frequency domain integration of the acceleration. The container is dynamically simulated through the displacement and the virtual container test bench to achieve fatigue evaluation of the container weld structure.

[0111] The following takes the tank container as an example to illustrate the specific process of the virtual dynamic experiment. The tank container includes two working conditions: empty and loaded. The loaded state is simulated by marking the load with water. After the car body is loaded with a heavy container, the torsional vibration mode is suppressed, and more car body vibration modes are attenuated. Due to the interaction between the tank container and the car body, the acceleration of the car body pillow beam, the acceleration of the car body end corner seat and the acceleration of the tank container corner seat appear high-frequency vibration, and the vibration frequency range is 20Hz to 60Hz. A finite element model of the container is established, and 4 interface connection points are established at the corner seat for connecting the multi-rigid body test bench. The finite element model is further used to generate the container flexible body modal set. For example, the flexible body modal set is explained based on Table 1.

[0112] Table 1 Flexible body modal set

[0113] Modal Order Mode Shape Modal frequency (Hz) Modal damping (%) 3 Upper side beams are bent in the same direction 14.03 0.15 4 The upper beam is bent vertically in the same direction 21.76 0.41 5 Upper side beam lateral reverse bending 13.819 0.33 6 Vertical reverse bending of the lower beam 21.77 0.44

[0114] The flexible body modal set was assembled with the rigid body test bench to establish a rigid-flexible coupling test model. The vertical and lateral accelerations of the four corners of the tank container were integrated into displacements using a frequency domain integration algorithm, with a cutoff frequency of 0.4Hz to 30Hz. Rain flow counting was further performed based on dynamic stress, and a life assessment was performed. It was found that the connection between the frame and the tank body was a weak point in fatigue strength, and structural improvements were made. After the improvement, a virtual dynamic test device was used to verify reliability.

[0115] According to an embodiment of the present invention, an embodiment of a device for evaluating fatigue performance of a container based on test data is provided. It should be noted that the device can be used to execute the above-mentioned method for evaluating fatigue performance of a container based on test data.

[0116] Figure 6 is a schematic diagram of a container fatigue performance evaluation device based on test data according to an embodiment of the present invention. Figure 6 As shown, the device includes: an acquisition module 60, which is used to obtain the corner seat acceleration of the container and the flexible body modal set of the container, wherein the corner seat acceleration is the acceleration of the four corner seats of the container, the corner seat acceleration is obtained through experiments, and the flexible modal set is used to characterize the inherent vibration characteristics of the structural response of the container flexible body when the container flexible body is subjected to external force; a first processing module 62, which is used to perform frequency domain integration of the corner seat acceleration to obtain the corner seat displacement of the container, wherein the corner seat displacement is used to characterize the displacement of the four corner seats of the container, and the corner seat displacement includes: displacement in multiple directions; an input module 64, which is used to input the corner seat displacement into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, wherein the dynamic simulation test system is obtained by connecting the flexible body modal set and a pre-trained container dynamic simulation test bench, and the dynamic simulation test system at least includes: multiple directions of oil cylinders, and the target weld is used to characterize the weld on the container that bears the load; a second processing module 66, which is used to obtain the fatigue performance evaluation result of the container based on the fatigue life curve and the dynamic stress, wherein the fatigue performance evaluation result is used to characterize whether the damage value of the container meets the preset standard.

[0117] Optionally, the acquisition module is also used to obtain the corner seat acceleration of the container based on the line operation dynamic response test, wherein the test conditions of the line operation dynamic response test need to cover the actual driving environment of the vehicle loaded with the container; or, it is also used to obtain the corner seat acceleration of the container through an indoor vehicle vibration test bench.

[0118] Optionally, the above device also includes a modeling module.

[0119] Optionally, a modeling module is used to perform plate and shell unit modeling on the body of the container to obtain a first modeling; establish four rigid zones for the four corner seats respectively, and perform small mass unit modeling on the four rigid zones to obtain multiple second modelings; summarize the first modeling and the multiple second modelings to obtain a finite element modeling of the container, wherein the finite element modeling is a physical representation of the container; establish a coordinate system based on the finite element modeling of the container to obtain the rigid body generalized coordinates of the container, wherein the rigid body generalized coordinates are used to describe the position and posture of the container in three-dimensional space.

[0120] Optionally, the acquisition module is also used to add modal coordinates to the rigid body generalized coordinates of the container to obtain the flexible generalized coordinates of the container, wherein the modal coordinates are used to characterize the vibration modes of the container at different frequencies; based on the target modal synthesis method and the flexible generalized coordinates, the flexible body modal set of the container is obtained.

[0121] Optionally, the first processing module is also used to perform discrete Fourier transform on the angular seat acceleration to obtain a simple harmonic signal of the acceleration; integrate the simple harmonic signal according to a preset number of integration times to obtain harmonics of the angular seat displacement; and superimpose the harmonics based on a preset signal processing method to obtain the angular seat displacement.

[0122] Optionally, the input module is also used to use the displacement in different directions as the initial driving displacement of the cylinder in the corresponding direction, and test the container based on a preset load step to obtain virtual accelerations in multiple directions, wherein the preset load step is the load step of the sampling frequency; obtain the difference between the acceleration in different directions and the virtual acceleration in the corresponding direction to obtain the difference in multiple directions; in response to the difference in multiple directions being less than the preset threshold of the corresponding direction, extract the dynamic stress of the target weld.

[0123] Optionally, the above device also includes: a determination module.

[0124] Optionally, a determination module is used to determine a target difference among multiple differences, wherein the target difference is greater than a preset threshold value; adjust the initial driving displacement of the cylinder in the direction corresponding to the target difference to obtain the adjusted initial driving displacement of the cylinder in the direction corresponding to the target difference; repeat the steps of driving the container based on a preset load step and the adjusted initial displacement to obtain virtual accelerations in multiple directions, and obtaining differences in multiple directions based on the virtual accelerations in multiple directions and accelerations in different directions, until the differences in multiple directions are all less than the preset threshold value in the corresponding direction.

[0125] Optionally, the second processing module is further used to perform statistics on the range and number of cycles of dynamic stress to obtain initial statistical results; and calculate the initial statistical results based on the fatigue life curve to obtain fatigue performance evaluation results.

[0126] Optionally, the second processing module is further used to determine, in response to the damage value being greater than or equal to a preset threshold, that the fatigue performance evaluation result is that the damage value does not meet the preset standard; and in response to the damage value being less than a preset threshold, determine that the fatigue performance evaluation result is that the damage value meets the preset standard.

[0127] An embodiment of the present application further provides an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods in various embodiments of the present invention when running.

[0128] An embodiment of the present application further provides a computer-readable storage medium, which includes a stored executable program, wherein when the executable program is running, the device where the computer-readable storage medium is located is controlled to execute the methods in various embodiments of the present invention.

[0129] An embodiment of the present application further provides a computer program product, including a computer program, which implements the methods in various embodiments of the present invention when executed by a processor.

[0130] An embodiment of the present application further provides a computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium is used to store a computer program, and when the computer program is executed by a processor, the method in each embodiment of the present invention is implemented.

[0131] The embodiments of the present application further provide a computer program, which implements the methods in the above-mentioned embodiments of the present invention when executed by a processor.

[0132] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0134] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0135] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0136] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0137] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for evaluating the fatigue performance of a container based on test data, characterized in that: include: Obtaining the corner seat acceleration of the container and the flexible body modal set of the container, wherein the corner seat acceleration is the acceleration of four corner seats of the container, and the corner seat acceleration is obtained through experiments, and the flexible modal set is used to characterize the inherent vibration characteristics of the structural response of the flexible body of the container when the flexible body of the container is subjected to external force; Perform frequency domain integration on the corner seat acceleration to obtain the corner seat displacement of the container, wherein the corner seat displacement is used to characterize the displacement of the four corner seats of the container, and the corner seat displacement includes: displacement in multiple directions; The angular displacement is input into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, wherein the dynamic simulation test system is obtained by connecting the flexible body modal set and a pre-trained container dynamic simulation test bench, and the dynamic simulation test system at least includes: cylinders in multiple directions, and the target weld is used to characterize the weld on the container that bears the load; Based on the fatigue life curve and the dynamic stress, a fatigue performance evaluation result of the container is obtained, wherein the fatigue performance evaluation result is used to indicate whether the damage value of the container meets a preset standard.

2. The method according to claim 1, characterized in that Obtaining the corner seat acceleration of the container includes one of the following: Obtaining the corner seat acceleration of the container based on a line operation dynamic response test, wherein the test conditions of the line operation dynamic response test need to cover the actual driving environment of the vehicle loaded with the container; The corner seat acceleration of the container is obtained through an indoor whole vehicle vibration test bench.

3. The method according to claim 1, characterized in that Before obtaining the flexible body modal set of the container, the method further includes: Performing plate and shell unit modeling on the container body to obtain a first modeling; Establishing four rigid regions for the four corner seats respectively, performing small mass unit modeling on the four rigid regions, and obtaining a plurality of second models; Summarizing the first modeling and the plurality of second modelings to obtain a finite element modeling of the container, wherein the finite element modeling is a physical representation of the container; A coordinate system is established based on the finite element modeling of the container to obtain the rigid body generalized coordinates of the container, wherein the rigid body generalized coordinates are used to describe the position and posture of the container in three-dimensional space.

4. The method according to claim 1 or 3, characterized in that: The flexible body modal set of the container is obtained, including: Adding modal coordinates to the rigid generalized coordinates of the container to obtain flexible generalized coordinates of the container, wherein the modal coordinates are used to characterize the vibration modes of the container at different frequencies; Based on the target modal synthesis method and the flexible generalized coordinates, a flexible body modal set of the container is obtained.

5. The method according to claim 1, characterized in that Integrating the corner seat acceleration in the frequency domain to obtain the corner seat displacement of the container includes: Performing discrete Fourier transform on the corner seat acceleration to obtain a simple harmonic signal of the corner seat acceleration; Integrate the simple harmonic signal according to a preset number of integration times to obtain the harmonic of the angular position shift; The harmonics are superimposed based on a preset signal processing method to obtain the angular displacement.

6. The method according to claim 1, characterized in that The angular displacement is input into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, including: The displacements in different directions are used as the initial driving displacements of the oil cylinders in the corresponding directions, and the container is tested based on a preset load step to obtain virtual accelerations in multiple directions, wherein the preset load step is a load step of a sampling frequency; Obtain the difference between the acceleration in different directions and the virtual acceleration in the corresponding direction, and obtain the difference in multiple directions; In response to the differences in the multiple directions being all smaller than preset thresholds in the corresponding directions, the dynamic stress of the target weld is extracted.

7. The method according to claim 6, characterized in that The method further comprises: Determining a target difference value among the multiple differences, wherein the target difference value is greater than the preset threshold value; Adjusting the initial driving displacement of the oil cylinder in the direction corresponding to the target difference to obtain the adjusted initial driving displacement of the oil cylinder in the direction corresponding to the target difference; Repeat the steps of testing the container based on the preset load step and the adjusted initial displacement drive to obtain virtual accelerations in the multiple directions, and obtaining differences in the multiple directions based on the virtual accelerations in the multiple directions and the accelerations in different directions, until the differences in the multiple directions are all less than the preset thresholds of the corresponding directions.

8. The method according to claim 1, characterized in that Based on the fatigue life curve and the dynamic stress, a fatigue performance evaluation result of the container is obtained, including: Counting the range and the number of cycles of the dynamic stress to obtain initial statistical results; The initial statistical result is calculated based on the fatigue life curve to obtain the fatigue performance evaluation result.

9. The method according to claim 8, characterized in that The method further comprises: In response to the damage value being greater than or equal to a preset threshold, determining that the fatigue performance evaluation result is that the damage value does not meet the preset standard; In response to the damage value being less than a preset threshold, determining the fatigue performance evaluation result as the damage value meeting the preset standard.

10. A container fatigue performance evaluation device based on test data, characterized in that: include: an acquisition module, used to acquire the corner seat acceleration of the container and the flexible body modal set of the container, wherein the corner seat acceleration is the acceleration of four corner seats of the container, and the corner seat acceleration is obtained through experiments, and the flexible modal set is used to characterize the inherent vibration characteristics of the structural response of the flexible body of the container when the flexible body of the container is subjected to external force; A first processing module is used to perform frequency domain integration on the corner seat acceleration to obtain the corner seat displacement of the container, wherein the corner seat displacement is used to characterize the displacement of four corner seats of the container, and the corner seat displacement includes: displacement in multiple directions; An input module is used to input the angular displacement into a dynamic simulation test system to obtain the dynamic stress of the target weld of the container, wherein the dynamic simulation test system is obtained by connecting the flexible body modal set and a pre-trained container dynamic simulation test bench, and the dynamic simulation test system at least includes: cylinders in multiple directions, and the target weld is used to characterize the weld on the container that bears the load; The second processing module is used to obtain a fatigue performance evaluation result of the container based on the fatigue life curve and the dynamic stress, wherein the fatigue performance evaluation result is used to indicate whether the damage value of the container meets a preset standard.

11. An electronic device, characterized in that: include: A memory storing an executable program; A processor, configured to run the program, wherein the program executes the method according to any one of claims 1 to 9 when running.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored executable program, wherein when the executable program is executed, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 9.

13. A computer program product, characterized in that The invention comprises a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 9.

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