Strength-based Structural Reliability Design Method, Device, Cab and Medium

Abstract

The present invention provides a strength-based structural reliability design method, device, cab and medium, belonging to the technical field of structural reliability design. The method includes: performing static strength analysis on a measured structure subjected to at least one working condition to obtain stress results; acquiring the risk parameters and remaining life of the measured structure; determining a static strength working condition combination in the at least one working condition based on the stress results and the risk parameters; determining the strength value of the static strength working condition combination, and constructing a correlation model between the strength value and the remaining life; acquiring the target strength value of a structure to be designed, and determining the reliability of the structure to be designed based on the target strength value and the correlation model. The present invention improves the accuracy and efficiency of structural reliability design.

Description

Technical Field

[0001] The present invention relates to the technical field of structural reliability design, and particularly relates to a structural reliability design method, device, cab and medium based on strength. Background Art

[0002] For high-precision structural reliability design, durability analysis needs to be carried out, that is, to determine its fatigue life. Patent CN117408124A discloses a method for durability analysis of a battery frame, which includes the following steps: establishing a geometric model of the battery frame assembly, where the battery frame assembly includes a battery frame and a vehicle frame part, and the battery frame is installed on the vehicle frame part; establishing a finite element analysis model according to the geometric model; using the finite element analysis model to perform a unit load stress field analysis on the battery frame assembly based on the vehicle frame part; using the finite element analysis model to obtain the load spectrum of the battery frame assembly based on the battery frame and the vehicle frame part; and combining the results of the unit load stress field analysis, the load spectrum of the battery frame assembly, and the fatigue characteristic curve of the material constituting the battery frame to obtain the durability analysis result of the battery frame.

[0003] In the prior art, the accuracy of reliability design depends on the accurate acquisition of the load spectrum, but the load spectrum requires a large number of road spectrum acquisition tests, which are difficult to obtain, with low speed and accuracy.

[0004] Therefore, there is an urgent need to provide a structural reliability design method, device, cab and medium based on strength to improve the accuracy and efficiency of structural reliability design. Summary of the Invention

[0005] In view of this, it is necessary to provide a structural reliability design method, device, cab and medium based on strength to solve the technical problems of low accuracy and efficiency in structural reliability design existing in the prior art.

[0006] On the one hand, to solve the above technical problems, the present invention provides a structural reliability design method based on strength, including:

[0007] Performing static strength analysis on the measured structure under at least one working condition to obtain stress results;

[0008] Obtaining the risk parameters and remaining life of the measured structure;

[0009] Determining the static strength working condition combination in the at least one working condition based on the stress results and the risk parameters;

[0010] Determining the strength value of the static strength working condition combination, and constructing an association model between the strength value and the remaining life;

[0011] Obtain the target strength value of the structure to be designed, and determine the reliability of the structure to be designed based on the target strength value and the correlation model.

[0012] In a possible implementation, the at least one working condition includes a G-load working condition, a torsion working condition, and a modal working condition.

[0013] In a possible implementation, the static strength analysis of the structure under test to which at least one working condition is applied to obtain stress results includes:

[0014] Construct a finite element simulation model of the structure under test;

[0015] Apply the at least one working condition to the finite element simulation model;

[0016] Perform a simulation analysis on the finite element simulation model to which the at least one working condition is applied to obtain the stress results.

[0017] In a possible implementation, the risk parameters include multiple risk occurrence locations, and the stress results include multiple high stress point locations; then determining the static strength working condition combination in the at least one working condition based on the multiple stress results and the multiple risk parameters includes:

[0018] Compare the multiple high stress point locations with the multiple risk occurrence locations to obtain at least one target high stress point location that is the same as the risk occurrence location among the multiple high stress point locations;

[0019] Take the at least one working condition corresponding to the at least one target high stress point location as the static strength working condition combination.

[0020] In a possible implementation, the risk parameters further include multiple risk values, and the stress results include multiple high stress values; then after taking the at least one working condition corresponding to the at least one target high stress point location as the static strength working condition combination, it further includes:

[0021] Determine the ratio of the high stress value at the target high stress point location to the risk value of the corresponding risk occurrence location;

[0022] When the ratio is outside the preset ratio range, the static strength working condition combination is inaccurate; when the ratio is within the preset ratio range, the static strength working condition combination is accurate.

[0023] In a possible implementation, constructing the correlation model between the strength value and the remaining life includes:

[0024] Determine the strength safety factor of the structure under test;

[0025] Determine the safety strength value based on the strength value and the strength safety factor;

[0026] Construct the correlation model based on the safety strength value and the remaining life.

[0027] In a possible implementation, the strength safety factor includes a normal strength safety factor, a symmetric cyclic variable amplitude normal stress safety factor, and a symmetric cyclic variable amplitude torsional stress safety factor.

[0028] On the other hand, the present invention also provides a strength-based structural reliability design device, including:

[0029] A static strength analysis unit for performing static strength analysis on the measured structure under at least one working condition to obtain stress results;

[0030] A reliability data acquisition unit for acquiring the risk parameters and remaining life of the measured structure;

[0031] A static strength working condition combination determination unit for determining the static strength working condition combination in the at least one working condition based on the stress results and the risk parameters;

[0032] A correlation model construction unit for determining the strength value of the static strength working condition combination and constructing a correlation model between the strength value and the remaining life;

[0033] A reliability design unit for obtaining the target strength value of the structure to be designed and determining the reliability of the structure to be designed based on the target strength value and the correlation model.

[0034] On the other hand, the present invention also provides a cab, and the cab is designed using the strength-based structural reliability design method;

[0035] Wherein, the strength-based structural reliability design method is the strength-based structural reliability design method in any of the above possible implementation manners.

[0036] On the other hand, the present invention also provides a computer-readable storage medium, and a program or instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps in the strength-based structural reliability design method in any of the above possible implementation manners are implemented.

[0037] The beneficial effects of the present invention are as follows: The strength-based structural reliability design method provided by the present invention obtains a stress structure through static strength analysis of a measured structure to which at least one working condition is applied. Based on the stress results and the risk parameters of the measured structure obtained, the static strength working condition combination can be determined. Then, an association model between the remaining life obtained and the strength value of the static strength working condition combination is constructed. Subsequently, the reliability of the structure to be designed can be directly determined according to the association model and the target strength value of the structure to be designed obtained. The remaining life can be obtained through strength calculation, that is, reliability design analysis can be realized, the fatigue analysis process is reduced, and thus the technical problems of low efficiency and accuracy caused by the need to obtain a load spectrum in fatigue analysis are avoided, and the accuracy and efficiency of structural reliability design are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a schematic flowchart of an embodiment of the strength-based structural reliability design method provided by the present invention;

[0040] Figure 2 For the present invention Figure 1 It is a schematic flowchart of an embodiment of step S101 in the present invention;

[0041] Figure 3 For the present invention Figure 1 It is a schematic flowchart of an embodiment of step S103 in the present invention;

[0042] Figure 4 It is a schematic flowchart of an embodiment for verifying the accuracy of the static strength working condition combination provided by the present invention;

[0043] Figure 5 For the present invention Figure 1 It is a schematic flowchart of an embodiment for constructing an association model between strength value and remaining life in step S104 of the present invention;

[0044] Figure 6 It is a schematic structural diagram of an embodiment of the strength-based structural reliability design device provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0046] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate the operations implemented according to some embodiments of the present invention. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present invention. Some of the block diagrams shown in the drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor systems and / or microcontroller systems.

[0047] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] The present invention provides a strength-based structural reliability design method, device, cab, and medium, which will be described separately below.

[0049] Figure 1 It is a schematic flowchart of an embodiment of the strength-based structural reliability design method provided by the present invention. As Figure 1 shown, the strength-based structural reliability design method includes:

[0050] S101. Perform a static strength analysis on the measured structure under at least one working condition to obtain stress results;

[0051] S102. Obtain the risk parameters and remaining life of the measured structure;

[0052] S103. Determine the static strength working condition combination in at least one working condition based on the stress results and risk parameters;

[0053] S104. Determine the strength value of the static strength working condition combination, and construct an association model between the strength value and the remaining life;

[0054] S105. Obtain the target strength value of the structure to be designed, and determine the reliability of the structure to be designed based on the target strength value and the correlation model.

[0055] Among them, the structure to be measured can be any kind of structure. In a specific embodiment of the present invention, the structure to be measured is a cab.

[0056] It should be noted that: to ensure the accuracy of reliability design, the structure of the structure to be designed is the same as that of the structure to be measured. When the structure to be measured is a cab, the structure to be designed is also a cab, which can be cabs of different vehicles, but all are cabs.

[0057] Among them, the risk parameters and remaining life of the structure to be measured in step S102 are data stored in a storage medium and can be directly obtained by calling from the storage medium, and they are obtained according to reliability analysis.

[0058] It should be understood that: step S105 is specifically: determine the target remaining life of the structure to be designed based on the target strength value and the correlation model, judge whether the target remaining life meets the requirements. If not, improve some structures or materials of the structure to be designed, and conduct analysis again after improvement until the target remaining life meets the requirements, so that the reliability of the structure to be designed meets the requirements.

[0059] Compared with the prior art, the strength-based structural reliability design method provided by the embodiments of the present invention obtains a stress structure through static strength analysis of the structure to be measured under at least one working condition, and can determine the static strength working condition combination based on the stress result and the risk parameters of the structure to be measured obtained. Then, based on the remaining life obtained, a correlation model between it and the strength value of the static strength working condition combination is constructed. Subsequently, the reliability of the structure to be designed can be directly determined according to the correlation model and the target strength value of the structure to be designed obtained. The remaining life can be obtained through strength calculation, that is: reliability design analysis can be realized, the fatigue analysis process is reduced, thus avoiding the technical problems of low efficiency and low accuracy caused by the need to obtain a load spectrum in fatigue analysis, and improving the accuracy and efficiency of structural reliability design.

[0060] To improve the applicability of the strength-based structural reliability design method, the working conditions should include all working conditions of the structure to be measured. In a specific embodiment of the present invention, at least one working condition includes a G-load working condition, a torsion working condition, and a modal working condition.

[0061] Among them, the G-load working condition refers to applying a load to the whole of the structure to be measured; the torque working condition refers to applying a torque or force to a local position of the structure to be measured; the modal working condition refers to applying vibration to the structure to be measured.

[0062] To ensure the accurate analysis of static strength, in some embodiments of the present invention, such asFigure 2 As shown in the figure, step S101 includes:

[0063] S201. Construct a finite element simulation model of the structure to be measured;

[0064] S202. Apply at least one working condition to the finite element simulation model;

[0065] S203. Conduct a simulation analysis on the finite element simulation model with at least one working condition applied to obtain stress results.

[0066] When the structure to be measured is a cab, step S201 is specifically as follows: separately establish CAD models of the body in white, body accessories (such as spoilers, berths, glove boxes, etc.), the body's upper suspension system, doors, front and rear glass, and the instrument beam system, and perform mesh division in the finite element pre-processing software HyperMesh. The weights of the driver and passengers are simulated by counterweights. Import the model with the divided mesh into the NASTRAN software, and thus obtain the finite element simulation model.

[0067] Among them, the body's upper suspension system includes a front upper suspension, a rear upper suspension, and shock absorbers.

[0068] In a specific embodiment of the present invention, at least one working condition includes three working conditions, as shown in Table 1:

[0069] Table 1 Working Conditions

[0070]

[0071] Among them, 1 represents movement along the X-axis, 2 represents movement along the Y-axis, 3 represents movement along the Z-axis, 4 represents rotation around the X-axis, 5 represents rotation around the Y-axis, and 6 represents rotation around the Z-axis.

[0072] The first working condition is specifically as follows: apply the constraints of 12356 to the front upper suspension, apply the constraints of 123456 to the rear upper suspension, and apply a G load of 1g along the positive X-axis direction, the positive Y-axis direction, and the negative Z-axis direction respectively.

[0073] The second working condition is specifically as follows: apply the constraints of 12356 to the front upper suspension, apply the constraints of 123 to the rear upper suspension, and apply a torque of 1g along the positive X-axis direction, the positive Y-axis direction, and the positive Z-axis direction respectively.

[0074] The third working condition is specifically as follows: inertial release (without applying any constraints), and apply a force of 1N along the positive X-axis direction, the positive Y-axis direction, and the negative Z-axis direction respectively.

[0075] In some embodiments of the present invention, the risk parameters include multiple risk occurrence locations, and the stress results include multiple high stress point locations; then as Figure 3 shown, step S103 includes:

[0076] S301. Compare the positions of multiple high-stress points with the positions of multiple risk occurrences to obtain at least one target high-stress point position among the multiple high-stress point positions that is the same as the risk occurrence position.

[0077] S302. Use at least one working condition corresponding to at least one target high-stress point position as the static strength working condition combination.

[0078] Since when the high-stress point position is the same as the risk occurrence position, it indicates that the damage mechanism of the structure to be measured is the same. Therefore, in the embodiments of the present invention, by using at least one working condition corresponding to at least one target high-stress point position among the multiple high-stress point positions that is the same as the risk occurrence position as the static strength working condition combination, the reliability of the static strength working condition combination can be improved.

[0079] Among them, the static strength working condition combination includes 2 - 4 working conditions. When there are more than 4 working conditions in the static strength working condition combination, at least one working condition in step S101 needs to be reset.

[0080] In a specific embodiment of the present invention, the number of risk occurrence positions is 5, and the number of high-stress positions corresponding to a single working condition is 3.

[0081] When the 3 high-stress positions in a certain single working condition completely coincide with 3 of the risk occurrence positions, use this single working condition as one of the working conditions in the static strength working condition combination. If the 2 high-stress positions in another single working condition completely coincide with the remaining 2 of the risk occurrence positions, then use the combination of these two working conditions as the static strength working condition combination.

[0082] Since when the damage mechanisms are the same but the damage values vary greatly, it is considered that the static strength working condition combination and the risk parameters are not well-matched at this time. To further improve the accuracy of establishing the correlation model, in some embodiments of the present invention, the risk parameters further include multiple risk values, and the stress results include multiple high-stress values. Then, after step S302, it further includes: verifying the accuracy of the static strength working condition combination. Specifically, as Figure 4 shown, verifying the accuracy of the static strength working condition combination includes:

[0083] S401. Determine the ratio of the high-stress value at the target high-stress point position to the risk value at the corresponding risk occurrence position.

[0084] S402. When the ratio is outside the preset ratio range, the static strength working condition combination is inaccurate; when the ratio is within the preset ratio range, the static strength working condition combination is accurate.

[0085] It should be noted that: the preset ratio range can be set or adjusted according to the actual application scenario or empirical values. In a specific embodiment of the present invention, the preset ratio range is 0.5 - 2.

[0086] In the embodiment of the present invention, the accuracy of the static strength condition combination is verified by the ratio of the high stress value to the risk value, which can ensure the accuracy of the static strength condition combination. Furthermore, the accuracy of the constructed correlation model can be improved, and thus the accuracy of the reliability analysis of the structure to be designed can be improved.

[0087] To further ensure the safety of the structure to be designed, in some embodiments of the present invention, as Figure 5 shown, the correlation model of the construction strength value and the remaining life in step S104 includes:

[0088] S501. Determine the strength safety factor of the structure to be measured;

[0089] S502. Determine the safety strength value based on the strength value and the strength safety factor;

[0090] S503. Construct a correlation model based on the safety strength value and the remaining life.

[0091] In the embodiment of the present invention, by setting a strength safety factor for the strength value and using the safety strength value considering the strength safety factor as the strength value in the correlation model, the margin design of the strength is realized, and further the design reliability of the structure to be designed can be improved.

[0092] In the specific embodiment of the present invention, the strength safety factor includes a general strength safety factor, a symmetric cyclic variable amplitude normal stress safety factor, and a symmetric cyclic variable amplitude torsional stress safety factor.

[0093] In the embodiment of the present invention, by considering the strength safety factors in different scenarios, the applicability of the strength-based structural reliability design method is improved.

[0094] Specifically, the general safety factor is:

[0095]

[0096] After considering the effective stress concentration factor, the size factor, and the surface factor, the symmetric cyclic variable amplitude normal stress safety factor in the case of symmetric cyclic variable amplitude normal stress can be obtained is:

[0097]

[0098] Similarly, the symmetric cyclic variable amplitude torsional stress safety factor in the case of symmetric cyclic variable amplitude torsional stress can be obtained is:

[0099]

[0100] In the formula: , is the fatigue limit of the material under symmetric cycling, the bending tensile is , the torsion is ; , are the effective stress concentration factors, and are the size factor and surface factor respectively; is the equivalent stress.

[0101] Among them, the numerator in the above formula is the target strength value in step S105.

[0102] In order to better implement the strength-based structural reliability design method in the embodiments of the present invention, correspondingly, based on the strength-based structural reliability design method, the embodiments of the present invention also provide a strength-based structural reliability design device, as Figure 6 shown, the strength-based structural reliability design device 600 includes:

[0103] A static strength analysis unit 601, configured to perform static strength analysis on the measured structure to which at least one working condition is applied, and obtain stress results;

[0104] A reliability data acquisition unit 602, configured to acquire risk parameters and remaining life of the measured structure;

[0105] A static strength working condition combination determination unit 603, configured to determine a static strength working condition combination in at least one working condition based on the stress results and risk parameters;

[0106] An associated model construction unit 604, configured to determine the strength value of the static strength working condition combination and construct an associated model between the strength value and the remaining life;

[0107] A reliability design unit 605, configured to acquire the target strength value of the structure to be designed, and determine the reliability of the structure to be designed based on the target strength value and the associated model.

[0108] The strength-based structural reliability design device 600 provided in the above embodiments can implement the technical solutions described in the embodiments of the strength-based structural reliability design method. For the specific implementation principles of the above modules or units, reference can be made to the corresponding content in the embodiments of the strength-based structural reliability design method, which will not be elaborated here.

[0109] The present invention also provides a cab, and the cab is designed using the strength-based structural reliability design method;

[0110] Among them, the strength-based structural reliability design method is the strength-based structural reliability design method in any one of the above embodiments.

[0111] Accordingly, an embodiment of the present invention further provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the programs or instructions are executed by a processor, the steps or functions in the strength-based structural reliability design method provided by the above method embodiments can be implemented.

[0112] Those skilled in the art can understand that all or part of the processes of implementing the methods of the above embodiments can be completed by instructing relevant hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium. Among them, the computer-readable storage medium is a magnetic disk, an optical disk, a read-only memory, or a random access memory, etc.

[0113] The above has introduced in detail a strength-based structural reliability design method, device, cab, and medium provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A strength-based structural reliability design method, characterized in that: include: Perform static strength analysis on the structure under test with at least one working condition applied to obtain stress results; Obtaining risk parameters and remaining life of the structure under test; Determining a static strength working condition combination in the at least one working condition based on the stress result and the risk parameter; Determining the strength value of the static strength condition combination, and constructing a correlation model between the strength value and the remaining life; Acquiring a target strength value of the structure to be designed, and determining the reliability of the structure to be designed based on the target strength value and the association model; The risk parameters include a plurality of risk occurrence locations, and the stress results include a plurality of high stress point locations; Then the step of determining a static strength working condition combination in the at least one working condition based on the stress result and the risk parameter includes: Comparing the multiple high stress point positions with the multiple risk occurrence positions to obtain at least one target high stress point position among the multiple high stress point positions that is the same as the risk occurrence position; At least one operating condition corresponding to the at least one target high stress point position is used as the static strength operating condition combination.

2. The strength-based structural reliability design method according to claim 1, characterized in that: The at least one operating condition includes a G load condition, a torsional condition, and a modal condition.

3. The strength-based structural reliability design method according to claim 1, characterized in that: The step of performing static strength analysis on the structure under test to which at least one working condition is applied to obtain stress results comprises: Constructing a finite element simulation model of the structure under test; applying the at least one operating condition to the finite element simulation model; A simulation analysis is performed on a finite element simulation model to which the at least one working condition is applied to obtain the stress result.

4. The strength-based structural reliability design method according to claim 1, characterized in that: The risk parameter further includes a plurality of risk values, and the stress result includes a plurality of high stress values; Then, after taking at least one working condition corresponding to the at least one target high stress point position as the static strength working condition combination, the method further includes: Determine the ratio of the high stress value at the target high stress point position to the risk value at the corresponding risk occurrence position; When the ratio is outside the preset ratio range, the static strength working condition combination is inaccurate; when the ratio is within the preset ratio range, the static strength working condition combination is accurate.

5. The strength-based structural reliability design method according to claim 1, characterized in that: The constructing of the correlation model between the strength value and the remaining life includes: Determining the strength safety factor of the structure under test; determining a safety strength value based on the strength value and the strength safety factor; The association model is constructed based on the safety strength value and the remaining life.

6. The strength-based structural reliability design method according to claim 5, characterized in that: The strength safety factor includes a common strength safety factor, a symmetrical cyclic amplitude normal stress safety factor and a symmetrical cyclic amplitude torsional stress safety factor.

7. A strength-based structural reliability design device, characterized in that: include: A static strength analysis unit, used to perform static strength analysis on the structure under test with at least one working condition applied to obtain stress results; A reliability data acquisition unit, used to acquire risk parameters and remaining life of the structure under test; a static strength working condition combination determining unit, configured to determine a static strength working condition combination in the at least one working condition based on the stress result and the risk parameter; A correlation model building unit, used to determine the strength value of the static strength condition combination and build a correlation model between the strength value and the remaining life; A reliability design unit, used for obtaining a target strength value of the structure to be designed, and determining the reliability of the structure to be designed based on the target strength value and the association model; The risk parameters include a plurality of risk occurrence locations, and the stress results include a plurality of high stress point locations; Then the step of determining a static strength working condition combination in the at least one working condition based on the stress result and the risk parameter includes: Comparing the multiple high stress point positions with the multiple risk occurrence positions to obtain at least one target high stress point position among the multiple high stress point positions that is the same as the risk occurrence position; At least one operating condition corresponding to the at least one target high stress point position is used as the static strength operating condition combination.

8. A cab, characterized in that: The cab is designed using a strength-based structural reliability design method; Wherein, the strength-based structural reliability design method is the strength-based structural reliability design method described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps in the strength-based structural reliability design method described in any one of 1 to 6 are implemented.

Images