An equivalent calculation method, device, computer device and storage medium for the segmented linear stiffness of a sealing strip

Abstract

The present invention discloses an equivalent calculation method, device, computer equipment and storage medium for the segmented linear stiffness of a sealing strip. Among them, the method includes the following steps: Step S1, identify the parameters of the 3rd-order Ogden constitutive model adopted by the sealing strip through uniaxial tensile test data to obtain the stress-strain curve; Step S2, use the nonlinear finite element method to calculate the compression amount of each position of the sealing strip in the door equilibrium state, segment the sealing strip at intervals of 100 mm, combine the stress-strain curve to conduct the CLD test on each segment of the sealing strip to obtain the test results, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state. In this method, the equivalent stiffness of the sealing strip is no longer a constant value, but an equivalent linear stiffness. When applied to door modal analysis and door modal prediction, it can improve the modal prediction accuracy of the door system, reduce the cumulative error of frequency and the cumulative error of modal confidence criterion.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive NVH, and particularly relates to an equivalent calculation method, device, computer device and storage medium for the segmented linear stiffness of a sealing strip. Background Technique

[0002] The main difference between the free state and the installed state of the door system lies in the sealing strip system. Therefore, the modeling accuracy of the sealing strip system is the key to improving the modal prediction accuracy of the door system. The sealing strip is a non-linear material, and its non-linear material characteristics are not suitable for direct use in modal analysis and need to be linearized.

[0003] When performing finite element simulation analysis of the installed door, the existing method usually equivalent the sealing strip to a spring with a fixed stiffness, that is, use linear spring elements to connect the corresponding nodes of the door structure and the body structure. This method is widely used in TrimBody (body with interior) modal analysis, TrimBody vibration transfer function analysis, and TrimBody noise transfer function analysis. However, the existing method has the following defects:

[0004] First, in the existing sealing strip model, the stiffness of the sealing strip is often determined according to experience without being verified by experiments. Generally, the stiffness per unit length is 0.03 - 0.05 N / mm. However, the stiffness of sealing strips with different materials, structures and manufacturers is not the same, and sometimes there is a large gap. The sealing strip stiffness determined only by experience will cause a large gap between the simulation model and the actual situation.

[0005] Second, in the existing sealing strip model, the stiffness of the sealing strip at all positions is considered to be a constant. However, in actual situations, due to the limitations of the assembly process of the door and the body, the compression amounts of different positions of the sealing strip are not the same, and the change in the compression amount will seriously affect the stiffness of the sealing strip. Ignoring the influence of the compression amount on the stiffness will significantly limit the accuracy of the sealing strip simulation model. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0007] To this end, an object of the present invention is to propose an equivalent calculation method for the segmented linear stiffness of a sealing strip, which can improve the analysis accuracy and prediction accuracy of the model.

[0008] A second object of the present invention is to propose an equivalent calculation device for the segmented linear stiffness of a sealing strip.

[0009] A third object of the present invention is to propose a computer device.

[0010] The fourth object of the present invention is to propose a non - transitory computer - readable storage medium.

[0011] To achieve the above object, an equivalent calculation method for the segmented linear stiffness of a sealing strip according to an embodiment of one aspect of the present invention includes the following steps:

[0012] Step S1: Identify the parameters of the 3 - order Ogden constitutive model adopted by the sealing strip through uniaxial tensile test data to obtain the stress - strain curve;

[0013] Step S2: Use the non - linear finite element method to calculate the compression amount at each position of the sealing strip in the door equilibrium state. Segment the sealing strip at intervals of 100 mm, and combine the stress - strain curve to conduct a CLD test on each segment of the sealing strip to obtain the test results. Use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state.

[0014] The equivalent calculation method for the segmented linear stiffness of the sealing strip in the embodiment of the present invention fits the constitutive relation parameters obtained through experiments, and combines advanced numerical simulation techniques to calculate the equivalent stiffness of each segment of the sealing strip. An equivalent spring element is established using the segmented equivalent linear stiffness value for modal analysis and prediction of the door system. The error between the modal frequencies and vibration modes of each order of the predicted door system and the experiment is less than that of the traditional constant stiffness method, reducing the cumulative frequency error and the cumulative MAC error.

[0015] In addition, the equivalent calculation method for the segmented linear stiffness of the sealing strip according to the above - mentioned embodiment of the present invention may further have the following additional technical features:

[0016] Further, in an embodiment of the present invention, the step S2 specifically includes:

[0017] Step S201: Model the sealing strip using 8 - node hexahedron linear reduced integration elements and the 3 - order Ogden constitutive model;

[0018] Step S202: Use a tensile - compression testing machine to test the sealing strip to obtain the CLD curve to obtain the corresponding relationship between the compression load and the compression amount;

[0019] Step S203: Take any point on the modeled sealing strip in the equilibrium state, and combine the stress - strain curve to obtain the compression amount and the corresponding change in the perturbed compression amount;

[0020] Step S204: Segment the sealing strip at intervals of 100 mm, equivalent each segment of the sealing strip to an elastic spring, and combine the compression amount of each segment and the corresponding change in the perturbed compression amount. Use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state.

[0021] Optionally, in an embodiment of the present invention, it further includes:

[0022] Step S3: Construct the undamped free vibration equation of the vehicle door according to the equivalent linear stiffness, and solve the modal vibration mode vector.

[0023] Step S4: Evaluate the modal vibration mode vector through the modal confidence criterion, and determine the accuracy of the vehicle door modal analysis to conduct the modal prediction of the vehicle door system.

[0024] Further, in an embodiment of the present invention, the undamped free vibration equation of the vehicle door in Step S3 is as follows:

[0025]

[0026] where, [M] is the mass matrix, [K] is the stiffness matrix, including the equivalent linear stiffness and other stiffnesses in the vehicle door system model, and {u i}(i = 1, 2, 3,..., n) is the eigenvector corresponding to the nth eigenvalue.

[0027] Further, in an embodiment of the present invention, the specific evaluation in Step S4 is as follows:

[0028]

[0029] where, MAC is the dot product between the vibration mode vectors, {u i} test is the modal vibration mode vector obtained through the test, is the transpose of the test modal vibration mode vector, and {u i} sim is the modal vibration mode vector obtained through the simulation.

[0030] To achieve the above object, an equivalent calculation device for the segmented linear stiffness of the sealing strip according to the second aspect embodiment of the present invention includes: a parameter identification module, configured to identify the parameters of the 3rd order Ogden constitutive model adopted by the sealing strip through the uniaxial tensile test data to obtain the stress-strain curve; an equivalent solution module, configured to calculate the compression amount of each position of the sealing strip in the vehicle door equilibrium state by using the nonlinear finite element method, segment the sealing strip at intervals of 100 mm, combine the stress-strain curve to conduct the CLD test on each segment of the sealing strip to obtain the test results, and solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state by using the linear stiffness equivalent algorithm.

[0031] An equivalent calculation device for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention fits the constitutive relation parameters obtained through experiments, combines advanced numerical simulation techniques, calculates the equivalent stiffness of each segment of the sealing strip, and uses the segmented equivalent linear stiffness values to establish equivalent spring elements for modal analysis and prediction of the door system. The error between the predicted modal frequencies and vibration modes of each order of the door system and the experiment is less than that of the traditional constant stiffness method, reducing the cumulative frequency error and the cumulative MAC error.

[0032] In addition, the equivalent calculation device for the segmented linear stiffness of the sealing strip according to the above embodiment of the present invention may further have the following additional technical features:

[0033] Further, in an embodiment of the present invention, the equivalent solution module is specifically used for: a modeling unit, which is used to model the sealing strip by using an 8-node hexahedron linear reduced integration element and a 3rd-order Ogden constitutive model; a testing unit, which is used to test the sealing strip by using a tensile and compression testing machine to obtain a CLD curve to obtain the corresponding relationship between the compression load and the compression amount; a solution unit, which is used to take any point on the modeled sealing strip in the equilibrium state, and solve the compression amount and the corresponding perturbed compression amount change in combination with the stress-strain curve; an equivalent solution unit, which is used to segment the sealing strip at intervals of 100 mm, equivalent each segment of the sealing strip to an elastic spring, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state in combination with the compression amount of each segment and the corresponding perturbed compression amount change.

[0034] Further, in an embodiment of the present invention, it further includes: a construction module, which is used to construct a door undamped free vibration equation according to the equivalent linear stiffness and solve the modal vibration mode vector; an evaluation module, which evaluates the modal vibration mode vector through the modal confidence criterion to determine the accuracy of the door modal analysis for modal prediction of the door system.

[0035] To achieve the above object, a third aspect embodiment of the present invention proposes a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the method described in any one of the above are implemented.

[0036] To achieve the above object, a fourth aspect embodiment of the present invention proposes a non-temporary computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described above are implemented.

[0037] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0039] Figure 1 is a flowchart of an equivalent calculation method for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a uniaxial tensile test on a sealing strip using a tensile testing machine according to an embodiment of the present invention;

[0041] Figure 3 is a compression amount calculation model of a sealing strip according to an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of a test using a tensile and compression testing machine according to an embodiment of the present invention;

[0043] Figure 5 is a nominal stress-strain curve diagram according to a specific embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of the position of a deformation amount monitoring point according to a specific embodiment of the present invention;

[0045] Figure 7 is a schematic structural diagram of an equivalent calculation device for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention. Detailed Embodiments

[0046] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0047] An equivalent calculation method, device, computer device, and storage medium for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention will be described below with reference to the accompanying drawings. First, an equivalent calculation method for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0048] Figure 1 is a flowchart of an equivalent calculation method for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention.

[0049] As Figure 1 shown, the equivalent calculation method for the segmented linear stiffness of a sealing strip includes the following steps:

[0050] In step S1, the parameters of the 3rd-order Ogden constitutive model adopted by the sealing strip are identified through uniaxial tensile test data to obtain a stress-strain curve.

[0051] Specifically, Figure 2 As shown, in the embodiment of the present invention, a tensile testing machine is used to perform a uniaxial tensile test on the sealing strip. The test temperature is room temperature. If a non-normal temperature test is required, the laboratory temperature to be tested must be controlled before the uniaxial tensile test, and the sample must be placed in the laboratory for 3 hours before the test. Then, the simplified equiaxial tensile test Ogden strain energy function, Cauchy principal stress and strain energy function, and nominal stress σ in the tensile direction are used. nom and the nominal strain ε nom The relationship between the elongation λ and the Cauchy stress δ gives the expression of the third-order Ogden form nominal stress-strain curve:

[0052]

[0053] Among them, μ i and δ i are all material-related parameters, which can be obtained by fitting the uniaxial tensile test data, that is, by substituting the stress-strain curve obtained by the test into the above formula, u i and α i After three sets of tests, the average value of the measured tension and displacement is taken, and the nominal stress σ is obtained by data processing. nom and the nominal strain ε nom Sample point data.

[0054] The error function is defined as:

[0055]

[0056] In the formula, σ nom..j and ε nom..j They are the nominal stress sample points and strain sample points obtained from the uniaxial tensile test, respectively.

[0057] In step S2, a nonlinear finite element method is used to calculate the compression amount of each position of the sealing strip of the vehicle door in the equilibrium state. The sealing strip is divided into sections at intervals of 100 mm. Each section of the sealing strip is subjected to a CLD test in combination with the stress-strain curve to obtain the test results. The linear stiffness equivalent algorithm is used to solve the equivalent linear stiffness of each section of the sealing strip in the equilibrium state.

[0058] Furthermore, in one embodiment of the present invention, step S2 specifically includes:

[0059] Step S201 : Modeling the sealing strip using an 8-node hexahedral linear reduced integration unit and a third-order Ogden constitutive model.

[0060] Step S202: Using a tension and compression testing machine to test the sealing strip to obtain a CLD curve, so as to obtain a corresponding relationship between the compression load and the compression amount.

[0061] In step S203, take any point on the modeled sealing strip in the equilibrium state, and combine with the stress-strain curve to obtain the compression amount and the corresponding perturbed compression amount change.

[0062] In step S204, divide the sealing strip into segments at intervals of 100 mm, and equivalent each segment of the sealing strip to an elastic spring. Combine the compression amount of each segment and the corresponding perturbed compression amount change, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state.

[0063] Specifically, in an embodiment of the present invention, as Figure 3 shown, the finite element model with a complete left front door and door frame as shown is the compression amount calculation model of the sealing strip. The body sheet metal parts are modeled using 10 mm shell elements, and the sealing strip is modeled using 8-node hexahedron linear reduced integration elements and the fitted 3rd-order Ogden constitutive model. Among them, contact pairs are defined between the sealing strip and the sheet metal parts, as well as between the latch and the ratchet pawl. The body truncation position is fully constrained. When the door is opened 5 degrees, an initial angular velocity of 1.89 rad / s is applied to the door to close it. When the door is completely closed and stationary, it is the equilibrium state. Then, the compression amount of each point on the vehicle sealing strip in the equilibrium state can be calculated and recorded as {u 0}.

[0064] Then, as Figure 4 shown, a 100 mm long sample of the sealing strip is intercepted and installed on the surface of the lower tooling and fixed. The upper tooling surface compresses the sealing strip vertically downward at a speed of 30 mm / min. The upper and lower tooling surfaces for compressing the sealing strip need to be consistent with the compression surface in the actual vehicle state. After repeatedly compressing 2 - 3 times until stable, a test is carried out with a compression stroke of 0 - 6 mm and the test data is recorded, so as to obtain the CLD curve of the sealing strip to obtain the corresponding relationship between the compression load F and the compression amount u. Take any point on the sealing strip in the equilibrium state, and record its compression amount as u 01 , and the perturbed compression amount change is ε.

[0065] Expand F = f(u) into a Taylor series with respect to ε at the equilibrium position to get:

[0066]

[0067] Among them, when the sealing strip undergoes linear vibration in the equilibrium state, ε is a small quantity, then the higher-order small quantities in the above formula can be ignored, and it is simplified to:

[0068]

[0069] The equivalent linear stiffness in the equilibrium state can be obtained from the above formula Since f(u) is an unknown function, in engineering problems it can be obtained through the CLD of the sealing strip at the compression amount of u 01Secant approximation of the position.

[0070]

[0071] Wherein, u i and u j are the compression amounts near u 01 in the CLD curve, F i and F j are the corresponding compression loads. κ is the linearized stiffness of the sealing strip in the equilibrium state, and u 01 can be obtained through finite element calculation, and u i , u j , F i , F j can be obtained through the CLD test. Then, the equivalent linear stiffness κ can be obtained by using the above formula.

[0072] Then, the entire sealing strip is segmented at intervals of 100 mm, and each segment is equivalent to an elastic spring. Combining the stress-strain curve, the compression amount of each segment, the CLD curve, and the linear stiffness equivalent algorithm, the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state is solved, and this stiffness is used for the modal prediction of the door system.

[0073] Furthermore, in an embodiment of the present invention, it further includes:

[0074] Step S3: Construct an undamped free vibration equation of the door according to the equivalent linear stiffness, and solve the modal vibration mode vector;

[0075] Step S4: Evaluate the modal vibration mode vector through the modal confidence criterion, and determine the accuracy of the door modal analysis to perform the modal prediction of the door system.

[0076] Specifically, in an embodiment of the present invention, a finite element model of the door assembly is established, and the overall mass matrix [M] and the overall stiffness matrix [K] of the assembly are obtained through the finite element assembly method. The undamped free vibration equation of the door in step S3 is:

[0077]

[0078] Wherein, [M] is the mass matrix, [K] is the stiffness matrix, including the equivalent linear stiffness and other stiffnesses in the door system model. Solving the above formula can obtain the nth-order eigenvalue ω i (i = 1, 2, 3,..., n) and the eigenvector {u i} sim (i = 1, 2, 3,..., n). The eigenvalue is the vibration frequency, and the eigenvector is the modal vibration mode vector.

[0079] Furthermore, in an embodiment of the present invention, the specific evaluation in step S4 is:

[0080]

[0081] Among them, MAC is the dot product between mode shape vectors, which is used to evaluate the geometric correlation between two mode shape vectors. is the modal mode shape vector obtained from the test. is the transpose of the test modal mode shape vector, {u i} sim is the modal mode shape vector obtained from the simulation. If {u i} test is linearly correlated with {u i} sim the MAC value is close to 1. If the two are linearly independent, the MAC value is approximately 0.

[0082] The following further describes an equivalent calculation method for the segmented linear stiffness of a sealing strip of the present invention through a specific embodiment.

[0083] Step 1, as Figure 5 shown, use a material tensile testing machine to conduct a material tensile test on the sealing strips on the vehicle body side and the door side, and obtain the nominal stress-strain curve after processing the test data.

[0084] Step 2, use the 3rd-order Ogden model for the constitutive model of the sealing strip, and adopt the Levenberg-Marquardt nonlinear algorithm to fit the material tensile test data to obtain the constitutive model parameters in the following table:

[0085] Constitutive model parameters

[0086]

[0087] As Figure 6 shown, use the half-vehicle finite element model to calculate the compression amount of the sealing strip in the equilibrium state. The 3rd-order Ogden constitutive model and the parameters in the above table are used for both the sealing strip on the vehicle body side and the door side. Monitoring points are set every 100 mm to output the deformation amount of the sealing strip. Four positions are selected for the CLD test on the door side sealing strip, and two positions numbered 12 (section 1) and numbered 26 (section 2) in the following figure are selected for the CLD test on the vehicle body sealing strip side.

[0088] The CLD at these positions can represent the CLD characteristics of the entire circle of the sealing strip. According to the CLD test results at the positions of section 1 and section 2 and the compression amount of each part, using the formula,

[0089]

[0090] The equivalent stiffness of each point of the sealing strip can be obtained. It can be seen that the stiffness values of each numbered point obtained by the piecewise linear stiffness equivalent method are no longer constant values. The piecewise equivalent linear stiffness values are used for both the body side and the door side sealing strips to establish equivalent spring elements for the modal analysis of the door system. Define the difference between the simulation value and the test value of each order of the door system modal frequency as the frequency error, and the sum of the first 10 order frequency errors is the cumulative frequency error; define the difference between each order of the door modal MAC value and 1 as the mode shape error, and the sum of the first 10 order mode shape errors is the cumulative mode shape error. The errors between the modal frequencies and mode shapes of each order of the door system predicted by the piecewise linear stiffness equivalent method and the test are smaller than those of the traditional constant stiffness method. The cumulative frequency error is reduced by 5 Hz, and the cumulative MAC error is reduced by 0.53.

[0091] An equivalent calculation method for the piecewise linear stiffness of a sealing strip according to an embodiment of the present invention uses a uniaxial tensile test to measure the stress-strain curve of the sealing strip, and uses a 3rd-order Ogden constitutive model to describe the nonlinear properties of the sealing strip, so as to obtain the linear equivalent stiffness of the sealing strip under different compression amounts. The sealing strip is divided into several segments according to the change of the compression amount by the piecewise equivalent method, and different stiffness values are assigned to the sealing strips with different compression amounts, so as to establish a high-precision piecewise linear sealing strip equivalent model, which can be used for the modal analysis and prediction of the door system at the same time, and the errors between the modal frequencies and mode shapes of each order of the door system predicted and the test are smaller than those of the traditional constant stiffness method, reducing the cumulative frequency error and reducing the cumulative MAC error.

[0092] Secondly, a device for equivalent calculation of the piecewise linear stiffness of a sealing strip according to an embodiment of the present invention is described with reference to the accompanying drawings.

[0093] Figure 7 It is a schematic structural diagram of a device for equivalent calculation of the piecewise linear stiffness of a sealing strip according to an embodiment of the present invention.

[0094] As Figure 7 shown, the device 10 includes: a parameter identification module 100 and an equivalent solution module 200.

[0095] Among them, the parameter identification module 100 is used to identify the parameters of the 3rd-order Ogden constitutive model adopted by the sealing strip through uniaxial tensile test data to obtain the stress-strain curve. The equivalent solution module 200 is used to calculate the compression amount of each position of the sealing strip in the door equilibrium state by using the nonlinear finite element method, divide the sealing strip into segments at intervals of 100 mm, combine the stress-strain curve to perform CLD tests on each segment of the sealing strip to obtain test results, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state.

[0096] Furthermore, in an embodiment of the present invention, the equivalent solution module 200 is specifically used for:

[0097] A modeling unit, which is used to model the sealing strip by using 8-node hexahedron linear reduced integration elements and a 3rd-order Ogden constitutive model. A testing unit, which is used to test the sealing strip by using a tensile and compressive testing machine to obtain a CLD curve, so as to obtain the corresponding relationship between the compressive load and the compression amount. A solving unit, which is used to take any point on the modeled sealing strip in the equilibrium state, and solve the compression amount and the corresponding change in the disturbed compression amount in combination with the stress-strain curve. An equivalent solving unit, which is used to segment the sealing strip at intervals of 100 mm, equivalent each segment of the sealing strip to an elastic spring, and solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state by using a linear stiffness equivalent algorithm in combination with the compression amount of each segment and the corresponding change in the disturbed compression amount.

[0098] Furthermore, in an embodiment of the present invention, it further includes: a construction module 300, which is used to construct a door undamped free vibration equation according to the equivalent linear stiffness and solve the modal vibration mode vector. An evaluation module 400, which evaluates the modal vibration mode vector through a modal confidence criterion to determine the accuracy of the door modal analysis for door system modal prediction.

[0099] It should be noted that the foregoing explanatory description focused on the embodiment of the equivalent calculation method for the segmented linear stiffness of a sealing strip is also applicable to the equivalent calculation device for the segmented linear stiffness of a sealing strip in the embodiment of the present invention. Their implementation principles are similar and will not be elaborated here.

[0100] An equivalent calculation device for the segmented linear stiffness of a sealing strip according to an embodiment of the present invention uses a uniaxial tensile test to test the stress-strain curve of the sealing strip, uses a 3rd-order Odgen constitutive model to describe the nonlinear properties of the sealing strip, so as to obtain the linear equivalent stiffness of the sealing strip under different compression amount states. The sealing strip is divided into several segments according to the change in the compression amount by using a segmented equivalent method, and different stiffness values are assigned to the sealing strips with different compression amounts, so as to establish a high-precision segmented linear sealing strip equivalent model. At the same time, it can be used for door system modal analysis and prediction, and the error between the modal frequency and vibration mode of each order of the predicted door system and the test is less than that of the traditional constant stiffness method, reducing the frequency cumulative error and the MAC cumulative error.

[0101] To implement the above embodiment, the present invention also proposes a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements an equivalent calculation method for the segmented linear stiffness of a sealing strip as described in the foregoing embodiment.

[0102] To implement the above embodiment, the present invention also proposes a non-temporary computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements an equivalent calculation method for the segmented linear stiffness of a sealing strip as described in the foregoing embodiment.

[0103] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0104] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0105] Any process or method description in a flowchart or described in other ways herein can be understood as representing a module, segment, or portion of code including one or more N executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of the present invention includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0106] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or used in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection part (electronic device) having one or N wirings, a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, a computer-readable medium can even be paper or other suitable media on which a program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other appropriate processing if necessary, and then storing it in a computer memory.

[0107] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0108] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0109] In addition, each functional unit in various embodiments of the present invention may be integrated into one processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0110] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An equivalent calculation method for the segmented linear stiffness of a sealing strip, characterized in that, it includes the following steps: Step S1, identify the parameters of the 3rd order Ogden constitutive model adopted by the sealing strip through uniaxial tensile test data to obtain the stress-strain curve; Step S2, use the nonlinear finite element method to calculate the compression amount at each position of the sealing strip in the door equilibrium state, segment the sealing strip at intervals of 100 mm, combine the stress-strain curve to conduct CLD tests on each segment of the sealing strip to obtain test results, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state; The specific content of step S2 includes: Step S201, model the sealing strip by using 8-node hexahedral linear reduced integration elements and a 3rd-order Ogden constitutive model; then calculate to obtain the compression amount of each point on the vehicle sealing strip in the equilibrium state and denote it as {u 0}; Step S202, use a tensile-compression testing machine to test the sealing strip to obtain a CLD curve to obtain the corresponding relationship between the compression load and the compression amount; Step S203, take any point on the modeled sealing strip in the equilibrium state, and combine the stress-strain curve to obtain the compression amount and the corresponding change in the disturbed compression amount; Step S204, segment the sealing strip at intervals of 100 mm, equivalent each segment of the sealing strip to an elastic spring, combine the compression amount of each segment and the corresponding change in the disturbed compression amount, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state.

2. The equivalent calculation method for the segmented linear stiffness of a sealing strip according to claim 1, characterized in that, it further includes: Step S3, construct an undamped free vibration equation of the door according to the equivalent linear stiffness, and solve the modal vibration mode vector; Step S4, evaluate the modal vibration mode vector through the modal confidence criterion to determine the accuracy of the door modal analysis for door system modal prediction.

3. The equivalent calculation method for the segmented linear stiffness of a sealing strip according to claim 2, characterized in that, the undamped free vibration equation of the door in step S3 is: [M]{ü}+[K]{u}=0 Among them, [M] is the mass matrix, [K] is the stiffness matrix, including the equivalent linear stiffness and other stiffnesses in the door system model, {u i}, i = 1, 2, 3,..., n, is the eigenvector corresponding to the nth eigenvalue.

4. The equivalent calculation method for the segmented linear stiffness of a sealing strip according to claim 2, characterized in that, the specific evaluation in step S4 is: where MAC is the dot product between the mode shape vectors, {u i} test is the modal mode shape vector obtained from the test, is the transpose of the test modal mode shape vector, {u i} sim is the modal mode shape vector obtained from the simulation.

5. An equivalent calculation device for the segmented linear stiffness of a sealing strip, characterized in that, it includes: A parameter identification module, used to identify the parameters of the 3rd order Ogden constitutive model adopted by the sealing strip through uniaxial tensile test data to obtain the stress-strain curve; An equivalent solution module, used to calculate the compression amount at each position of the sealing strip in the door equilibrium state by using the nonlinear finite element method, segment the sealing strip at intervals of 100 mm, combine the stress-strain curve to conduct CLD tests on each segment of the sealing strip to obtain test results, and use the linear stiffness equivalent algorithm to solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state; The equivalent solution module is specifically used for: A modeling unit, which is used to model the sealing strip by using 8-node hexahedron linear reduced integration elements and a 3rd-order Ogden constitutive model; and then the compression amounts of each point on the vehicle sealing strip in the equilibrium state can be calculated and denoted as {u 0}; A test unit, used to use a tensile-compression testing machine to test the sealing strip to obtain a CLD curve to obtain the corresponding relationship between the compression load and the compression amount; A solution unit, used to take any point on the modeled sealing strip in the equilibrium state and combine the stress-strain curve to solve the compression amount and the corresponding change in the disturbed compression amount; An equivalent solution unit is used to segment the sealing strip at intervals of 100 mm, equivalent each segment of the sealing strip to an elastic spring, and solve the equivalent linear stiffness of each segment of the sealing strip in the equilibrium state by using the linear stiffness equivalent algorithm in combination with the compression amount and the corresponding change in the perturbed compression amount of each segment.

6. An equivalent calculation device for the segmented linear stiffness of a sealing strip according to claim 5, characterized in that, it further comprises: a construction module for constructing a door undamped free vibration equation according to the equivalent linear stiffness and solving the modal vibration mode vector; an evaluation module for evaluating the modal vibration mode vector by the modal confidence criterion to determine the door modal analysis accuracy for door system modal prediction.

7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, when the processor executes the computer program, the steps of the method according to any one of claims 1-4 are implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, the steps of the method according to any one of claims 1-4 are implemented.

Images