Stent fatigue test method, device, electronic equipment and storage medium

Abstract

The application provides a support fatigue test method and device, electronic equipment and a storage medium, and relates to the technical field of agricultural machinery. A multi-body dynamics model and a discrete element model of a to-be-tested bulk material self-unloading device are constructed; the to-be-tested bulk material self-unloading device is coupled and simulated through the multi-body dynamics model and the discrete element model, so that a hinge point force component time history curve of a support hinge point of the to-be-tested bulk material self-unloading device in a dumping cycle is obtained; an oil cylinder loading curve is obtained based on the hinge point force component time history curve; a load is applied to the support hinge point of a test bench based on the oil cylinder loading curve, so that a support fatigue performance verification result of the to-be-tested bulk material self-unloading device is obtained. The reliability and consistency of the verification result can be improved while the test cycle is shortened and the cost of manpower and material resources is reduced.

Description

Technical Field

[0001] This application relates to the field of agricultural machinery technology, and in particular to a method, apparatus, electronic device and storage medium for fatigue testing of supports. Background Technology

[0002] Bulk material unloading devices are key equipment for efficient transfer of bulk materials in agricultural machinery and other fields. The fatigue reliability of their structural components, such as the support frame, directly affects the safety and service life of the entire machine. For example, corn harvesters are crucial equipment in modern agricultural production, and their ear-box support frame is a key load-bearing structural component connecting the ear-box to the chassis. During the unloading and retrieval of the ear-box, the load of the box body and the loose ears inside is transmitted to the ear-box support frame through pins and hinged holes, subjecting the support frame to dynamic loads that change over time, leading to cumulative fatigue damage to the structure. The fatigue safety performance of the ear-box support frame directly affects the safety and reliability of the entire machine. If the support frame experiences fatigue fracture during operation, it will cause serious equipment failure or even a safety accident.

[0003] Currently, the typical fatigue test scheme for support is the "real vehicle + real material" test mode. However, the above method is limited by the rigid waiting link that needs to be repacked after each cycle and the inherent deviation of material properties deterioration caused by repeated use of real materials, resulting in high cost, low test efficiency and insufficient loading accuracy. Summary of the Invention

[0004] This application provides a method, apparatus, electronic device, and storage medium for fatigue testing of stents, which can improve the reliability and consistency of verification results while shortening the test cycle and reducing manpower and material costs.

[0005] In a first aspect, embodiments of this application provide a method for testing the fatigue of a stent, including: Construct a multibody dynamics model and a discrete element model of the bulk material unloading device under test; The time history curves of the hinge force components of the support hinge point of the bulk material unloading device under test were obtained by coupled simulation of the multibody dynamics model and the discrete element model during the unloading cycle. The cylinder loading curve is obtained based on the time history curve of the hinge force component. The load was applied to the hinge point of the support of the test bench based on the hydraulic cylinder loading curve, and the fatigue performance verification results of the support of the bulk material unloading device under test were obtained.

[0006] In one possible implementation, a multibody dynamics model and a discrete element model of the bulk material unloading device under test are constructed, including: Obtain the structural parameters, hinge point parameters, and physical property parameters of the stored bulk material particles of the unloading device under test; A multibody dynamics model is established based on structural parameters and hinge point parameters; Discrete element models are established based on physical property parameters.

[0007] In one possible implementation, a coupled simulation of the bulk material unloading device under test is performed using a multibody dynamics model and a discrete element model to obtain the time history curves of the hinge force components at the support hinge points of the bulk material unloading device under test during the unloading cycle, including: Obtain the unloading cycle of the bulk material self-unloading device under test. The unloading cycle includes the self-unloading time, the stationary time, and the recovery time. The box-shaped flipping motion of the multibody dynamics model is used as the boundary condition of the discrete element model, and the box wall load output by the discrete element model is used as the input load of the multibody dynamics model. By using a multibody dynamics model and a discrete element model, coupled simulation of the unloading device under test is performed based on the motion boundary conditions and input loads during the unloading cycle, and the time history curves of the hinge force components at the hinge point of the support of the unloading device under test are obtained.

[0008] In one possible implementation, the hinge point force component time history curve includes a one-sided hinge point force component time history curve of the upper hinge point and a one-sided hinge point force component time history curve of the lower hinge point; the cylinder loading curve is obtained based on the hinge point force component time history curve, including: The time history curves of the hinge force components are doubled to obtain the single-cycle double-sided equivalent hinge force curves of the cylinders corresponding to the upper and lower hinge points. The cylinder loading curve is obtained based on the single-cycle double-sided equivalent hinge point force curve.

[0009] In one possible implementation, the cylinder loading curve is obtained based on the single-cycle double-sided equivalent hinge point force curve, including: The single-cycle double-sided equivalent hinge point force curve is periodically spliced ​​and extended to generate a continuous periodic loading curve. The continuous periodic loading curve was used as the hydraulic cylinder loading curve of the test bench.

[0010] In one possible implementation, the cylinder loading curve includes the cylinder loading curves corresponding to the upper hinge point and the lower hinge point, respectively. Based on the hydraulic cylinder loading curve, a load was applied to the hinge point of the test bench support to obtain the fatigue performance verification results of the support of the bulk material unloading device under test, including: Based on the hydraulic cylinder loading curve control test bench, two sets of orthogonal hydraulic cylinders apply loads to the upper hinge point and lower hinge point respectively. After the cyclic loading reaches the preset number of times, the fatigue test data of the test bench support is obtained. The fatigue performance verification results of the support frame of the bulk material unloading device under test were obtained based on the fatigue test data of the support frame.

[0011] In one possible implementation, before applying a load to the support hinge point of the test bench based on the cylinder loading curve, the following is also included: Acquire the attitude information of the bulk material unloading device under test; The attitude of the test bench support is adjusted to the target attitude that matches the attitude information based on the attitude information.

[0012] Secondly, embodiments of this application provide a support fatigue testing device, comprising: The simulation model building unit is used to build the multibody dynamics model and discrete element model of the bulk material unloading device under test. The coupled simulation unit is used to perform coupled simulation of the bulk material unloading device under test through a multibody dynamics model and a discrete element model, and to obtain the time history curve of the hinge force component of the support hinge point of the bulk material unloading device under test during the unloading cycle. The data processing unit is used to obtain the cylinder loading curve based on the time history curve of the hinge force component; The test results unit is used to apply loads to the hinge points of the test bench based on the cylinder loading curve, and obtain the fatigue performance verification results of the support of the bulk material unloading device under test.

[0013] Thirdly, embodiments of this application provide an electronic device, including: a memory and a processor; The memory stores instructions that the computer executes; The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0015] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0016] The fatigue testing method, apparatus, electronic equipment, and storage medium provided in this application construct a multibody dynamics model and a discrete element model of the bulk material unloading device under test. Coupled simulation of the bulk material unloading device under test is performed using the multibody dynamics model and the discrete element model to obtain the time history curve of the hinge force component at the hinge point of the device's support during the unloading cycle. Based on the hinge force component time history curve, the hydraulic cylinder loading curve is obtained. Based on the hydraulic cylinder loading curve, a load is applied to the hinge point of the support on the test bench to obtain the fatigue performance verification results of the bulk material unloading device under test. Therefore, this application, while ensuring that the load application accuracy is highly consistent with the actual working conditions, eliminates the time loss caused by repeated packing and the load deviation caused by material deterioration, significantly shortening the test cycle, reducing manpower and material costs, and improving the consistency of loading accuracy and the reliability of the verification results. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1 A schematic diagram of an implementation environment provided for this application; Figure 2 A flowchart illustrating the fatigue testing method for the stent provided in this application; Figure 3 This is a schematic diagram of the simulation process of the multibody dynamics model and the discrete element model in one embodiment of this application; Figure 4 This is a simulation diagram of the fruit box flipping process in one embodiment of this application; Figure 5 This is a schematic diagram of the time history curve of the force component of the upper hinge point on one side during a single complete self-unloading-recovery cycle in one embodiment of this application; Figure 6 This is a schematic diagram of the time history curve of the force component of the lower hinge point on one side during a single complete self-unloading-recovery cycle in one embodiment of this application; Figure 7 This is a schematic diagram of the cylinder loading curve at the upper hinge point in a continuous and complete self-unloading-recovery cycle according to one embodiment of this application; Figure 8 This is a schematic diagram of the cylinder loading curve at the lower hinge point in a continuous and complete self-unloading-recovery cycle according to an embodiment of this application; Figure 9 This is a schematic diagram of the test bench in one embodiment of this application. Figure 1 ; Figure 10 This is a schematic diagram of the test bench in one embodiment of this application. Figure 2 ; Figure 11A schematic diagram of the support fatigue testing device provided in this application; Figure 12 A schematic diagram of the structure of the electronic device provided in this application.

[0019] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] The technical solutions of this application will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of an implementation environment provided by this application. The implementation environment includes a bulk material unloading device 10 to be tested, a server 20, and a test bench 30. The server 20 is connected to the bulk material unloading device 10 and the test bench 30 via wired or wireless means.

[0023] Server 20 is used to construct the multibody dynamics model and discrete element model of the bulk material unloading device 10 under test; the multibody dynamics model and discrete element model are used to perform coupled simulation of the bulk material unloading device 10 under test to obtain the hinge force component time history curve of the support hinge point of the bulk material unloading device 10 under test during the unloading cycle; the hydraulic cylinder loading curve is obtained based on the hinge force component time history curve; the hydraulic cylinder loading curve is used to apply load to the support hinge point of the test bench 30 to obtain the fatigue performance verification result of the support of the bulk material unloading device 10 under test.

[0024] It should be noted that, Figure 1 In the implementation environment shown, server 20 can be a standalone server or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and big data and artificial intelligence platforms. No restrictions are imposed here.

[0025] Figure 2 This is a flowchart illustrating the fatigue testing method for the stent provided in this application, as shown below. Figure 2 As shown, the method includes: S201. Construct the multibody dynamics model and discrete element model of the bulk material unloading device to be tested.

[0026] Among them, the multibody dynamics model is used to describe the kinematic pair connection relationship and rigid body motion law between the components of the bulk material unloading device, while the discrete element model is used to describe the physical properties of bulk material particles and the contact mechanical behavior between particles and between particles and the wall surface.

[0027] This embodiment establishes a multibody dynamics model and a discrete element method (DEM) model separately, providing a basic data carrier for subsequent coupled simulation. The independent construction of the two models retains the computational efficiency advantage of multibody dynamics in describing mechanism motion, while also taking into account the accuracy advantage of the discrete element method in handling the granular mechanical behavior of particulate materials.

[0028] S202. The test bulk material unloading device is subjected to coupled simulation using a multibody dynamics model and a discrete element model to obtain the time history curve of the hinge force component of the support hinge point of the test bulk material unloading device during the unloading cycle.

[0029] This embodiment couples the multibody dynamics model with the discrete element model to achieve real-time data interaction and synchronous solution between the two models. The resulting hinge force component time history curve reflects the dynamic change of the load on the support hinge point of the unloading device over time during the complete unloading cycle.

[0030] Compared to methods such as directly measuring hinge force on a real vehicle, repeatedly unloading real bulk materials on a real vehicle to simulate load, or using only multibody dynamics simulation, this embodiment can obtain high-precision hinge force load data at a lower cost through numerical simulation, significantly reducing the difficulty and cost of preliminary data acquisition. By using simulation to solidify the material characteristics of bulk particles into a mathematical model, it avoids load deviations caused by particle shedding, breakage, and morphological changes during repeated use of real materials, ensuring the accuracy, consistency, and repeatability of load data. Through the bidirectional coupling of MBD (Multibody Dynamics) and DEM (Discrete Element Method), it can accurately reflect the dynamic impact load on the container wall caused by changes in the flow state of discrete granular materials during unloading, thereby improving the simulation accuracy of the hinge force curve.

[0031] S203. Obtain the cylinder loading curve based on the time history curve of the hinge force component.

[0032] In this embodiment, the hinge point force component time history curve is subjected to necessary signal processing and format conversion to be transformed into a hydraulic cylinder loading curve that can be executed by the hydraulic cylinder of the test bench.

[0033] S204. Based on the hydraulic cylinder loading curve, a load is applied to the hinge point of the support of the test bench to obtain the fatigue performance verification results of the support of the bulk material unloading device under test.

[0034] In this embodiment, the hydraulic cylinder loading curve is input into the control system of the test bench. The hydraulic cylinder is controlled to apply dynamic loads to the support hinge point according to the load sequence specified by the curve. This effectively replicates the dynamic loads borne by the support hinge point during the actual unloading process, ensuring that the fatigue damage process experienced by the support on the test bench is highly consistent with the actual use condition, thus guaranteeing the validity of the verification results. Furthermore, the control of the test bench does not require continuous manual intervention, achieving automation and standardization of the test verification, avoiding errors that may be introduced by manual operation, and further improving the reliability and consistency of the verification results.

[0035] As can be seen, the fatigue testing method for supports provided in this application, by constructing a coupled simulation model of multibody dynamics and discrete element method, obtains the time history curves of the force components at the hinge points of the supports during the unloading cycle, and then converts them into hydraulic cylinder loading curves to control the test bench to apply an equivalent load to the supports. This realizes a fatigue testing method for supports that replaces physical testing with simulation calculations and replaces packing cycles with hydraulic cylinder loading. In this way, while ensuring that the load application accuracy is highly consistent with the actual working conditions, it eliminates the time loss caused by repeated packing and the load deviation caused by material deterioration, significantly shortens the test cycle, reduces manpower and material costs, and improves the consistency of loading accuracy and the reliability of verification results.

[0036] In an exemplary embodiment of this application, the steps of constructing the multibody dynamics model and discrete element model of the bulk material unloading device under test may specifically include: Obtain the structural parameters, hinge point parameters, and physical property parameters of the stored bulk material particles of the unloading device under test; A multibody dynamics model is established based on structural parameters and hinge point parameters; Discrete element models are established based on physical property parameters.

[0037] In this embodiment, the multibody dynamics model is established based on the structural parameters and hinge parameters of the device, so that the model accurately reflects the actual connection relationship and kinematic pair constraints between the components of the bulk material unloading device, ensuring the authenticity of the mechanism kinematics simulation; secondly, the discrete element model is established based on the physical property parameters of the bulk material particles, so that the model accurately reflects the intrinsic physical characteristics of the bulk material particles such as particle size distribution, density, friction coefficient, and springback coefficient, ensuring the accuracy of the particle mechanical behavior simulation.

[0038] Thus, in the above embodiments of this application, the multibody dynamics model and the discrete element model are independently constructed based on different types of input parameters, and the modeling process does not interfere with each other. Parameters can be calibrated and verified separately, and the parameters of any model can be flexibly adjusted without reconstructing the entire simulation system. This facilitates adaptive expansion for different working conditions or different materials, and together they provide a reliable model basis for the calculation of hinge force loads in subsequent coupled simulations.

[0039] In an exemplary embodiment of this application, the step of performing coupled simulation of the bulk material unloading device under test using a multibody dynamics model and a discrete element model to obtain the time history curve of the hinge force component of the support hinge point of the bulk material unloading device under test during the unloading cycle may specifically include: Obtain the unloading cycle of the bulk material self-unloading device under test. The unloading cycle includes the self-unloading time, the stationary time, and the recovery time. The box-shaped flipping motion of the multibody dynamics model is used as the boundary condition of the discrete element model, and the box wall load output by the discrete element model is used as the input load of the multibody dynamics model. Using a multibody dynamics model and a discrete element model, coupled simulations of the unloading device under test were performed based on motion boundary conditions and input loads during the unloading cycle, resulting in the time history curves of the hinge force components at the hinge points of the support of the unloading device under test.

[0040] In the multibody dynamics model, connection pairs between components are established, with revolute joints between hinge points and sliding joints for hydraulic cylinders. In the discrete element model, a discrete model of bulk particles (e.g., corn ears in a corn unloading device) is established, including contact parameters between corn ears and between the corn ears and the box wall, the shape of the ear pile, and the total mass. The total simulation time of the discrete element model corresponds consistently to that of the multibody dynamics model.

[0041] The unloading cycle is related to the unloading device of the bulk material to be tested and the bulk material particles stored. For example, in the unloading cycle of the unloading device for storing corn ears, 0~20S is the unloading, 20~25S is the stationary state, and 25~50S is the recovery state.

[0042] This embodiment uses multibody dynamics to apply the time sequence of the box's overturning motion as the boundary driving condition for particle motion in the discrete element model. Simultaneously, the discrete element model feeds back the dynamic loads of the particles on the box wall to the multibody dynamics model in real time. This enables accurate simulation calculation of the force at the support hinge point during the unloading-recovery process of discrete materials, outputting the time history curve of the hinge point force components. This curve fully reflects the dynamic change of the load on the support hinge point over time within a complete unloading cycle of the bulk material unloading device (including the unloading stage, the stationary stage, and the recovery stage).

[0043] like Figure 3 As shown, Figure 3This is a schematic diagram of the simulation process of the multibody dynamics model and the discrete element model in one embodiment of this application. When performing coupled simulation using the multibody dynamics model and the discrete element model, various parameters such as the kinematic pairs, cylinder drive function, basic particle information, contact parameters between particles and with the wall, and the shape and total mass of the bulk material unloading device under test are acquired and input into the multibody dynamics software and the discrete element software to construct the multibody dynamics model and the discrete element model of the bulk material unloading device under test.

[0044] The box-shaped tilting motion of the multibody dynamics model is used as the boundary condition for the discrete element model (DEM), and the box wall load output by the DEM is used as the input load for the multibody dynamics model to calculate the required hydraulic cylinder driving force. The two are transmitted synchronously in real time. This allows the multibody dynamics model and the DEM to achieve real-time simulation calculation of the hinge force during the unloading and recovery process of discrete materials, obtaining the time history curves of the hinge force components at the support hinge points of the unloading device under test. Figure 4 As shown, Figure 4 This is a simulation diagram of the fruit ear box flipping process in one embodiment of this application.

[0045] Thus, the above embodiments of this application, through the synergistic effect of time-series partitioning and bidirectional coupling mechanism, enable the time history curves of the hinge force components obtained by simulation to be highly consistent with the actual unloading process in terms of load amplitude, phase and waveform characteristics, providing an accurate and complete load data basis for the subsequent generation of cylinder loading curves and bench fatigue verification.

[0046] In an exemplary embodiment of this application, the hinge point force component time history curve includes the one-sided hinge point force component time history curve of the upper hinge point and the one-sided hinge point force component time history curve of the lower hinge point. For example... Figure 5 and Figure 6 As shown, Figure 5 This is a schematic diagram of the time history curve of the force component of the upper hinge point on one side during a single complete self-unloading-recovery cycle in one embodiment of this application. Figure 6 This is a schematic diagram of the time history curve of the force component of the lower hinge point on one side during a single complete self-unloading-recovery cycle in one embodiment of this application. Wherein, F X F represents the component of the force component at a single hinge point on the X-axis in the time history curve. Z This refers to the component of the force component at a single hinge point on the Z-axis in the time history curve.

[0047] In this embodiment, the step of obtaining the cylinder loading curve based on the hinge point force component time history curve may specifically include: The time history curves of the hinge force components are doubled to obtain the single-cycle double-sided equivalent hinge force curves of the cylinders corresponding to the upper and lower hinge points. The cylinder loading curve is obtained based on the single-cycle double-sided equivalent hinge point force curve.

[0048] Since the forces at the hinge points on both sides of the support can be approximately identical, in order to reduce the number of loading cylinders in the test system, the hinge holes on both sides of the same group can be connected by a through pin. At the middle section of the pin, a set of orthogonal cylinders can be used to load the resultant force at the hinge points. At this time, the component of the hinge force applied by the cylinders should be twice the calculated force at the hinge points on one side.

[0049] Therefore, in this embodiment, during the process of obtaining the cylinder loading curve based on the time history curves of the single-sided hinge force component of the upper hinge point and the single-sided hinge force component of the lower hinge point, the time history curves of the single-sided hinge force component are doubled to obtain the single-cycle double-sided equivalent hinge force curves corresponding to the upper and lower hinge points, and then the cylinder loading curve is generated based on these curves.

[0050] Thus, the above embodiments of this application, by doubling the time history curve of the force component at the single hinge point output by simulation, make the cylinder loading curve numerically correspond to the actual stress state of the test bench loading. This ensures that the load applied to the hinge point of the support is equivalent to the actual working condition, and reduces the number of cylinders and sensors by half through the single-sided loading method, simplifying the configuration of the test bench.

[0051] In another exemplary embodiment, the step of obtaining the cylinder loading curve based on the single-cycle double-sided equivalent hinge point force curve may specifically include: The single-cycle double-sided equivalent hinge point force curve is periodically spliced ​​and extended to generate a continuous periodic loading curve. The continuous periodic loading curve was used as the hydraulic cylinder loading curve of the test bench.

[0052] To achieve a periodic, uninterrupted loading process, the single-cycle double-sided equivalent hinge point force obtained from the box body during the complete cycle of self-unloading-stationary-recovery needs to be converted into a periodic loading curve to facilitate continuous fatigue test simulation. In this embodiment, the single-cycle double-sided equivalent hinge point force curve is used as a basic template for periodic splicing and extension to generate a long-term continuous periodic loading curve, which is then directly used as the execution command curve for the hydraulic cylinder of the test bench. Figure 7 and Figure 8 As shown, Figure 7 This is a schematic diagram of the cylinder loading curve at the upper hinge point during a continuous and complete self-unloading-recovery cycle in one embodiment of this application. Figure 8 This is a schematic diagram of the cylinder loading curve at the lower hinge point in a continuous and complete self-unloading-recovery cycle according to one embodiment of this application. Figure 7 and Figure 8 Median segment type and Figure 5 and Figure 6 The meanings of the annotations are the same.

[0053] Thus, through the above embodiments, the single-cycle curve after doubling accurately reflects the amplitude and timing characteristics of the hinge force within a single complete unloading cycle. Using this curve as a basic template for periodic extension ensures that the cylinder loading command remains consistent with the load characteristics of the actual working condition in each cycle, and the load sequence of each cycle is exactly the same. This guarantees that the load conditions of each loading cycle in the fatigue test are consistent, facilitating standardized fatigue testing according to the number of cycles corresponding to the design life.

[0054] In an exemplary embodiment of this application, the cylinder loading curve includes the cylinder loading curves corresponding to the upper hinge point and the lower hinge point, respectively; correspondingly, the step of applying load to the hinge point of the test bench based on the cylinder loading curve to obtain the fatigue performance verification result of the support of the bulk material unloading device under test may specifically include: Based on the hydraulic cylinder loading curve control test bench, two sets of orthogonal hydraulic cylinders apply loads to the upper hinge point and lower hinge point respectively. After the cyclic loading reaches the preset number of times, the fatigue test data of the test bench support is obtained. The fatigue performance verification results of the support frame of the bulk material unloading device under test were obtained based on the fatigue test data of the support frame.

[0055] This embodiment defines independent cylinder loading curves for the upper and lower hinge points, allowing two sets of orthogonal cylinders to independently execute loading based on the load characteristics of their respective hinge points. Since the load amplitude and other characteristics experienced by the upper and lower hinge points during unloading differ, using independent loading curves ensures that the applied loads at both hinge points accurately correspond to the actual working conditions. This avoids the deviations introduced by using the same loading curve to substitute for loads at different hinge points, thus comprehensively reflecting the stress state of each hinge point during the actual unloading process. Furthermore, the fatigue test data obtained after a preset number of cyclic loading cycles directly reflects the cumulative damage and safety margin of the tested support within its design life.

[0056] Thus, in the above embodiments of this application, two sets of orthogonal hydraulic cylinders apply loads in concert according to their respective loading curves until the preset number of cyclic loadings is reached. During this process, the loading of the two hinge points is completely synchronized and independent of each other, which not only realizes the differentiated application of loads at different hinge points, but also ensures the synthesis accuracy of the component forces in the two orthogonal directions at the same set of hinge points, so that the loading process borne by the support on the test bench is equivalent to the actual working conditions.

[0057] In an exemplary embodiment of this application, before applying a load to the hinge point of the test bench based on the cylinder loading curve, a pre-processing step for the test bench is further included, which may specifically include: Acquire the attitude information of the bulk material unloading device under test; The attitude of the test bench support is adjusted to the target attitude that matches the attitude information based on the attitude information.

[0058] Please refer to the embodiments provided in this application. Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the test bench in one embodiment of this application. Figure 1 , Figure 10 This is a schematic diagram of the test bench in one embodiment of this application. Figure 2 .like Figure 9 and Figure 10 As shown, the test bench includes a hinge point force loading system 1 and an installation adjustment system 2, as well as a control system (not shown in the figure). The control system is connected to the hinge point force loading system 1 and the installation adjustment system 2 via wired or wireless means.

[0059] The hinge point force loading system 1 is used to apply orthogonal hinge point force components to each set of support hinge points. Through force sensors and control systems, the hydraulic cylinder force is precisely controlled to be applied according to the preset hinge point force components. The installation adjustment system 2 is used to simulate the fixing method of the box (e.g., fruit box) of the bulk material unloading device under test on the actual vehicle. In order to achieve the adaptability of supports of different specifications and make the posture of the support match the posture of the bulk material unloading device under test, waist holes or sliding rail structures can be designed on the fixed mounting plate to adapt to different installation distances.

[0060] Therefore, in this embodiment, the attitude of the test bench support is pre-adjusted before loading, so that the support on the test bench is consistent with the actual vehicle state in spatial orientation before bearing the load. In addition, since the attitude adjustment is completed independently before loading and does not involve modification of the hydraulic cylinder loading curve, the attitude adjustment and load application form two independent decoupled processes. After the attitude adjustment is completed, multiple cyclic loadings can be performed continuously while maintaining the attitude, without the need for repeated adjustment in each cycle.

[0061] Thus, the above embodiments of this application, by obtaining the actual vehicle posture information before loading and adjusting the bench support to the matching posture, eliminate the load transfer path deviation caused by the difference in installation posture, so that the subsequently applied hinge force acts on the support structure in the real spatial direction, and the load transfer path is consistent with the actual vehicle state, thereby ensuring that the stress distribution in the fatigue test is consistent with the actual working conditions, and improving the authenticity and effectiveness of the verification results.

[0062] Figure 11 The structural schematic diagram of the fatigue testing device for the support provided in this application is as follows: Figure 11 As shown, the fatigue testing device 110 for the support includes: Simulation model construction 1101 is used to construct the multibody dynamics model and discrete element model of the bulk material unloading device under test; The coupled simulation unit 1102 is used to perform coupled simulation of the bulk material unloading device under test through a multibody dynamics model and a discrete element model, and to obtain the time history curve of the hinge force component of the support hinge point of the bulk material unloading device under test during the unloading cycle. Data processing unit 1103 is used to obtain the cylinder loading curve based on the hinge point force component time history curve; Test result unit 1104 is used to apply load to the hinge point of the support of the test bench based on the cylinder loading curve to obtain the fatigue performance verification results of the support of the bulk material unloading device under test.

[0063] In one possible implementation, the simulation model construction 1101 is also used to obtain the structural parameters, hinge point parameters, and physical property parameters of the stored bulk material unloading device under test; a multibody dynamics model is established based on the structural parameters and hinge point parameters; and a discrete element model is established based on the physical property parameters.

[0064] In one possible implementation, the coupled simulation unit 1102 is also used to obtain the unloading cycle of the bulk material unloading device under test, which includes unloading time, stationary time, and recovery time; the box-turning motion of the multibody dynamics model is used as the motion boundary condition of the discrete element model, and the box wall load output by the discrete element model is used as the input load of the multibody dynamics model; through the multibody dynamics model and the discrete element model, the bulk material unloading device under test is coupled and simulated during the unloading cycle based on the motion boundary condition and the input load to obtain the hinge force component time history curve of the support hinge point of the bulk material unloading device under test.

[0065] In one possible implementation, the hinge point force component time history curve includes the one-sided hinge point force component time history curve of the upper hinge point and the one-sided hinge point force component time history curve of the lower hinge point; the data processing unit 1103 is also used to double the hinge point force component time history curve to obtain the single-cycle double-sided equivalent hinge point force curve of the cylinder corresponding to the upper and lower hinge points; and the cylinder loading curve is obtained based on the single-cycle double-sided equivalent hinge point force curve.

[0066] In one possible implementation, the data processing unit 1103 is further configured to periodically splice and extend the single-cycle double-sided equivalent hinge point force curve to generate a continuous periodic loading curve; and to use the continuous periodic loading curve as the cylinder loading curve of the test bench.

[0067] In one possible implementation, the cylinder loading curve includes the cylinder loading curves corresponding to the upper hinge point and the lower hinge point respectively; the test result unit 1104 is also used to control two sets of orthogonal cylinders of the test bench to apply loads to the upper hinge point and the lower hinge point respectively based on the cylinder loading curve. After the cyclic loading reaches the preset number of times, the fatigue test data of the support of the test bench is obtained; the fatigue performance verification result of the support of the bulk material unloading device under test is obtained based on the support fatigue test data.

[0068] In one possible implementation, an adjustment unit is also included, which is used to acquire the attitude information of the unloading device of the bulk material under test; and adjust the attitude of the support of the test bench to a target attitude that matches the attitude information based on the attitude information.

[0069] The fatigue testing device for the support provided in this embodiment can perform the method provided in the above-described method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0070] Figure 12 A schematic diagram of the structure of the electronic device provided in this application. Figure 12 As shown, the electronic device 120 provided in this embodiment includes at least one processor 1201 and a memory 1202. Optionally, the device 120 further includes a communication component 1203. The processor 1201, the memory 1202, and the communication component 1203 are connected via a bus 1204.

[0071] In a specific implementation, at least one processor 1201 executes computer execution instructions stored in memory 1202, causing at least one processor 1201 to perform the above-described method.

[0072] The specific implementation process of processor 1201 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0073] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0074] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0075] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0076] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0077] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0078] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0079] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0080] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0081] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0082] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0083] If a function is implemented as 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 this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0084] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0085] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0086] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for fatigue testing of a stent, characterized in that, include: Construct a multibody dynamics model and a discrete element model of the bulk material unloading device under test; The test bulk material unloading device was subjected to coupled simulation using the multibody dynamics model and the discrete element model to obtain the time history curve of the hinge force component of the support hinge point of the test bulk material unloading device during the unloading cycle. The cylinder loading curve is obtained based on the time history curve of the hinge point force component. Based on the cylinder loading curve, a load is applied to the hinge point of the support of the test bench to obtain the fatigue performance verification results of the support of the bulk material unloading device under test.

2. The method according to claim 1, characterized in that, The construction of the multibody dynamics model and discrete element model of the bulk material unloading device under test includes: Obtain the structural parameters, hinge point parameters, and physical property parameters of the stored bulk material particles of the unloading device under test; A multibody dynamics model is established based on the structural parameters and the hinge point parameters; A discrete element model is established based on the aforementioned physical property parameters.

3. The method according to claim 1 or 2, characterized in that, The coupled simulation of the bulk material unloading device under test using the multibody dynamics model and the discrete element model yields the time history curves of the hinge force components at the support hinge points of the bulk material unloading device under test during the unloading cycle, including: Obtain the unloading cycle of the bulk material self-unloading device under test, wherein the unloading cycle includes the self-unloading time, the stationary time, and the recovery time; The box-shaped flipping motion of the multibody dynamics model is used as the motion boundary condition of the discrete element model, and the box wall load output by the discrete element model is used as the input load of the multibody dynamics model. Using the multibody dynamics model and the discrete element model, coupled simulation of the bulk material unloading device under test is performed based on the motion boundary conditions and the input load during the unloading cycle to obtain the time history curve of the hinge force component of the support hinge point of the bulk material unloading device under test.

4. The method according to claim 1 or 2, characterized in that, The hinge point force component time history curves include the one-sided hinge point force component time history curves of the upper hinge point and the one-sided hinge point force component time history curves of the lower hinge point. The process of obtaining the cylinder loading curve based on the time history curve of the hinge point force component includes: The time history curves of the hinge force components are doubled to obtain the single-cycle double-sided equivalent hinge force curves of the cylinders corresponding to the upper and lower hinge points. The cylinder loading curve is obtained based on the single-cycle double-sided equivalent hinge point force curve.

5. The method according to claim 4, characterized in that, The process of obtaining the cylinder loading curve based on the single-cycle double-sided equivalent hinge point force curve includes: The single-cycle double-sided equivalent hinge point force curve is periodically spliced ​​and extended to generate a continuous periodic loading curve. The continuous periodic loading curve is used as the hydraulic cylinder loading curve of the test bench.

6. The method according to claim 1 or 2, characterized in that, The cylinder loading curve includes the cylinder loading curves corresponding to the upper hinge point and the lower hinge point, respectively. The process of applying load to the hinge point of the test bench based on the cylinder loading curve to obtain the fatigue performance verification results of the support of the bulk material unloading device under test includes: Based on the cylinder loading curve, the two sets of orthogonal cylinders of the test bench are controlled to apply loads to the upper hinge point and the lower hinge point respectively. After the cyclic loading reaches the preset number of times, the fatigue test data of the support of the test bench is obtained. The fatigue performance verification results of the support for the bulk material unloading device under test were obtained based on the fatigue test data of the support.

7. The method according to claim 1 or 2, characterized in that, Before applying a load to the hinge point of the test bench support based on the cylinder loading curve, the following steps are also included: Obtain the attitude information of the bulk material unloading device under test; Based on the attitude information, the support posture of the test bench is adjusted to a target posture that matches the attitude information.

8. A fatigue testing device for a support frame, characterized in that, include: The simulation model building unit is used to build the multibody dynamics model and discrete element model of the bulk material unloading device under test. The coupled simulation unit is used to perform coupled simulation of the bulk material unloading device under test through the multibody dynamics model and the discrete element model, and to obtain the time history curve of the hinge force component of the support hinge point of the bulk material unloading device under test during the unloading cycle. The data processing unit is used to obtain the cylinder loading curve based on the time history curve of the hinge force component; The test results unit is used to apply load to the hinge point of the support of the test bench based on the cylinder loading curve, and obtain the fatigue performance verification results of the support of the bulk material unloading device under test.

9. An electronic device, characterized in that, include: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the bracket fatigue testing method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the stent fatigue testing method as described in any one of claims 1 to 7.

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