Method, device and equipment for predicting abnormal sound of safety belt retractor and medium

Abstract

The invention relates to the technical field of automobile design and development, in particular to a method and device for predicting abnormal sound of a safety belt retractor, equipment and a medium. According to the method, the installation mode frequency value and the installation point dynamic stiffness value of the safety belt retractor in the vehicle research and development process are calculated through the target vehicle finite element model, and the calculation results are compared and analyzed with the installation mode frequency critical value and the installation point dynamic stiffness critical value when the safety belt retractor generates abnormal sound; therefore, the risk of abnormal sound of the safety belt retractor can be quickly and accurately predicted, structure optimization suggestions are proposed as soon as possible, the potential abnormal sound problem can be avoided in the design stage, and thus it is ensured that a mass-produced vehicle does not have the risk of abnormal sound of the safety belt retractor.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile design and development, and in particular to a method, device, equipment and medium for predicting abnormal noise of a seat belt retractor. Background Art

[0002] With the development of the automobile industry, the level of automobile intelligence is getting higher and higher. At present, the abnormal sound of the seat belt retractor refers to the unusual sound or noise emitted by the seat belt retractor during the driving or operation of the car. It is a comprehensive indicator used to measure the quality of automobile manufacturing.

[0003] Nowadays, the integrated functions of vehicle seat belt retractors are becoming more and more complete, the structure is becoming more and more complex, and the weight is also increasing. During the driving process of the vehicle, or when the car occupants close the door forcefully, the retractor itself vibrates under the action of external force, thereby generating abnormal noises and causing complaints from passengers. The existing technology usually uses the vehicle body + seat belt retractor assembly model to control the abnormal noise of the seat belt retractor. However, due to the large amount of interference noise in the abnormal noise evaluation process of the whole vehicle and the complex sound of the abnormal noise, it often interferes with the subjective evaluation process of abnormal noise detection, resulting in a decrease in the accuracy of predicting the risk of abnormal noise of the seat belt retractor. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, equipment and medium for predicting abnormal noise of seat belt retractors in response to the above-mentioned technical problems, which can quickly and accurately predict the risk of abnormal noise of seat belt retractors in the early design stage of the vehicle, thereby effectively avoiding the abnormal noise problem of seat belt retractors of mass-produced vehicles.

[0005] A first aspect of an embodiment of the present application provides a method for predicting abnormal noise of a seat belt retractor, the method for predicting abnormal noise of a seat belt retractor comprising:

[0006] Obtaining a critical value of the installation modal frequency and a critical value of the installation point dynamic stiffness when an abnormal noise problem occurs in the seat belt retractor, wherein the critical value of the installation modal frequency and the critical value of the installation point dynamic stiffness are obtained based on an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively;

[0007] Based on the finite element model of the target vehicle, the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle are calculated;

[0008] The installation modal frequency value is compared with the installation modal frequency critical value, and the installation inching stiffness value is compared with the installation inching stiffness critical value to determine the abnormal noise risk of the seat belt retractor.

[0009] A second aspect of an embodiment of the present application provides a device for predicting abnormal noise of a seat belt retractor, the device for predicting abnormal noise of a seat belt retractor comprising:

[0010] An acquisition module, used to acquire an installation modal frequency critical value and an installation point dynamic stiffness critical value when an abnormal noise problem occurs in a seat belt retractor, wherein the installation modal frequency critical value and the installation point dynamic stiffness critical value are obtained based on an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively;

[0011] A calculation module, used for calculating the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle based on the finite element model of the target vehicle;

[0012] A comparison module is used to compare the installation modal frequency value with the installation modal frequency critical value, and to compare the installation point dynamic stiffness value with the installation point dynamic stiffness critical value, so as to determine the abnormal noise risk of the seat belt retractor.

[0013] In a third aspect, an embodiment of the present invention provides a computer device, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for predicting abnormal noise of a seat belt retractor as described in the first aspect above when executing the computer program.

[0014] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for predicting abnormal noise of a seat belt retractor described in the first aspect above is implemented.

[0015] In summary, the present invention provides a method, device, equipment and medium for predicting abnormal noise of a seat belt retractor, by obtaining the installation modal frequency critical value and the installation point dynamic stiffness critical value when the seat belt retractor has an abnormal noise problem, wherein the installation modal frequency critical value and the installation point dynamic stiffness critical value are obtained by performing an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively, and based on a finite element model of a target vehicle, calculating the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle, comparing the installation modal frequency value with the installation modal frequency critical value, and comparing the installation point dynamic stiffness value with the installation point dynamic stiffness critical value, to determine the abnormal noise risk of the seat belt retractor. This application uses a finite element model of a target vehicle to calculate the installation modal frequency value and the installation point stiffness value of a seat belt retractor during the vehicle development process, and compares and analyzes the calculation results with the installation modal frequency critical value and the installation point stiffness critical value when the seat belt retractor makes abnormal noise. This allows for rapid and accurate prediction of the risk of abnormal noise from the seat belt retractor, and for early structural optimization suggestions to avoid potential abnormal noise problems in the design stage, thereby effectively avoiding abnormal noise problems in seat belt retractors of mass-produced vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the installation of a seat belt retractor provided by one embodiment of the present invention;

[0018] Figure 2 It is a flow chart of a method for predicting abnormal noise of a seat belt retractor provided by an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of an acceleration admittance function curve of a seat belt retractor installation point provided by an embodiment of the present invention;

[0020] Figure 4 It is a structural schematic diagram of a device for predicting abnormal noise of a seat belt retractor provided by one embodiment of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0025] As used in the present specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]", depending on the context.

[0026] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0029] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0030] In one embodiment, if Figure 1 As shown, it is a schematic diagram of the installation of a seat belt retractor provided by an embodiment of the present invention. This application shows the positional relationship between the vehicle body sheet metal, the seat belt retractor and the mounting hole. This structure can help users to correctly install the seat belt retractor, ensure its effectiveness and safety, and achieve the accuracy of subsequent data acquisition.

[0031] It should be noted that the vehicles in the present invention include but are not limited to small cars, compact cars, mid-sized cars, and medium-to-large cars, etc., and are not specifically limited in the present invention.

[0032] In one embodiment, if Figure 2 As shown, an embodiment of the present invention further provides a method for predicting abnormal noise of a seat belt retractor, and a flow chart of the method is shown in FIG. Figure 2 As shown, the method for predicting abnormal noise of a seat belt retractor may include the following steps:

[0033] S201: Obtaining the critical value of the installation modal frequency and the critical value of the installation point dynamic stiffness when an abnormal noise problem occurs in the seat belt retractor, wherein the critical value of the installation modal frequency and the critical value of the installation point dynamic stiffness are obtained based on the installation modal test and the installation point dynamic stiffness test of the sample vehicle, respectively.

[0034] As an optional embodiment, obtaining the critical value of the installation modal frequency and the critical value of the installation point stiffness when the seat belt retractor has an abnormal noise problem includes:

[0035] Obtaining a first installation modal frequency value group and a second installation modal frequency value group, wherein the first installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle without abnormal noise, and the second installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle with abnormal noise;

[0036] Determining, according to the first installation modal frequency value group and the second installation modal frequency value group, a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor;

[0037] Obtaining a first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group, wherein the first installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle without abnormal noise, and the second installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle with abnormal noise;

[0038] The critical value of the installation inching stiffness when an abnormal noise problem occurs in the seat belt retractor is determined according to the first installation inching stiffness value group and the second installation inching stiffness value group.

[0039] Specifically, by evaluating the abnormal noise of the seat belt retractors of the sample vehicles, the vehicles with the abnormal noise problem of the seat belt retractors and the vehicles without the abnormal noise problem of the seat belt retractors among the n sample vehicles are determined, the vehicles without the abnormal noise problem are set as the vehicle set N1 without the abnormal noise, and the vehicles with the abnormal noise problem are set as the vehicle set N2 with abnormal noise, the seat belt retractors of each vehicle without the abnormal noise are tested for installation modal frequency to obtain the installation modal frequency value corresponding to each vehicle without the abnormal noise, and the installation modal frequency values ​​corresponding to all the vehicles without the abnormal noise are recorded as a group of installation modal frequency value groups, that is, the first installation modal frequency value group of the seat belt retractors, and the seat belt retractors of each vehicle with abnormal noise are tested for installation modal frequency to obtain the installation modal frequency value corresponding to each vehicle with abnormal noise, and the installation modal frequency values ​​corresponding to all the vehicles with abnormal noise are recorded as a group of installation modal frequency value groups, that is, the second installation modal frequency value group of the seat belt retractors;

[0040] Similarly, an installation point dynamic stiffness test is performed on the seat belt retractor of each vehicle without abnormal noise to obtain the installation point dynamic stiffness value corresponding to each vehicle without abnormal noise, and the installation point dynamic stiffness values ​​corresponding to all vehicles without abnormal noise are recorded as a group of installation point dynamic stiffness value groups, i.e., the first installation point dynamic stiffness value group of the seat belt retractor; and an installation point dynamic stiffness test is performed on the seat belt retractor of each vehicle with abnormal noise to obtain the installation point dynamic stiffness value corresponding to each vehicle with abnormal noise, and the installation point dynamic stiffness values ​​corresponding to all vehicles with abnormal noise are recorded as a group of installation point dynamic stiffness value group, i.e., the second installation point dynamic stiffness value group of the seat belt retractor.

[0041] In this embodiment, since the first installation modal frequency value group is the installation modal frequency obtained based on the installation modal test of the vehicle without abnormal noise, the second installation modal frequency value group is the installation modal frequency obtained based on the installation modal test of the vehicle with abnormal noise, the first installation point dynamic stiffness value group is the installation point dynamic stiffness obtained based on the installation point dynamic stiffness test of the vehicle without abnormal noise, and the second installation point dynamic stiffness value group is the installation point dynamic stiffness obtained based on the installation point dynamic stiffness test of the vehicle with abnormal noise, then according to the first installation modal frequency value group and the second installation modal frequency value group, the installation modal frequency critical value when the seat belt retractor has an abnormal noise problem can be determined, and according to the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group, the installation point dynamic stiffness critical value when the seat belt retractor has an abnormal noise problem can be determined.

[0042] Through a large number of sample vehicle tests, this application has found the installation point dynamic stiffness requirements and installation modal requirements for avoiding the occurrence of abnormal noise problems in seat belt retractors. This can more intuitively evaluate the dynamic stiffness of the sheet metal mounting holes of the seat belt retractors, prevent the seat belt retractor body from generating large vibrations, and thereby suppress the generation of abnormal noises.

[0043] As an optional embodiment, determining the critical value of the installation modal frequency when the seat belt retractor has an abnormal sound problem includes:

[0044] Calculating an intersection between the first installation modal frequency value group and the second installation modal frequency value group;

[0045] According to the intersection between the first installation modal frequency value group and the second installation modal frequency value group, the average value of the installation modal frequencies in the intersection is calculated to obtain a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor.

[0046] Specifically, the installation modal frequencies of the vehicles without abnormal noise problems in the vehicle set N1 without abnormal noise are tested, and the first installation modal frequency value group is recorded: f1, f2, ..., f k ; Test the installation modal frequency of the vehicles with abnormal noise problems in the abnormal noise vehicle set N2, and record the second installation modal frequency value group: f k+1 , f k+2 , …, f n . In general, the higher the installation modal frequency of the seat belt retractor, the lower the probability of abnormal noise. The installation modal frequency of the seat belt retractor corresponding to the vehicle set N1 without abnormal noise is generally higher than the installation modal frequency of the seat belt retractor corresponding to the vehicle set N2 with abnormal noise. When the number of sample vehicles is large enough, the installation modal frequencies of the seat belt retractors corresponding to the vehicle set N1 without abnormal noise and the vehicle set N2 with abnormal noise must have the same value. These same values ​​are the critical values ​​of the installation modal frequencies for the abnormal noise of the seat belt retractor. If the installation modal frequencies are greater than the critical values, the risk of abnormal noise of the seat belt retractor is low; if the installation modal frequencies are less than or equal to the critical values, the risk of abnormal noise of the seat belt retractor is high. Then, the set composed of the same seat belt retractor installation modal frequencies is set as A:

[0047] A=[f1,f2,…,f k ]∩[f k+1 , f k+2 , …, f n ] (1)

[0048] Among them, f1, f2, ..., f k is the first installation modal frequency value group, that is, the installation modal frequency corresponding to the noise-free vehicle set N1, f k+1 , f k+2 , …, fn is the second installation modal frequency value group, that is, the installation modal frequency corresponding to the abnormal noise vehicle set N2, and A is the intersection between the first installation modal frequency value group and the second installation modal frequency value group. Then, according to the intersection between the first installation modal frequency value group and the second installation modal frequency value group, the average value of the installation modal frequency in the intersection is calculated to obtain the critical value of the installation modal frequency when the seat belt retractor has an abnormal noise problem, wherein the average value of the installation modal frequency of the seat belt retractor in the intersection set A is the critical value of the installation modal frequency when the seat belt retractor has an abnormal noise problem, and the calculation formula is as follows:

[0049]

[0050] Among them, |A| is the sum of all installed modal frequency elements in the intersection set A, and card(A) is the number of installed modal frequency elements in the intersection set A.

[0051] As an optional embodiment, obtaining the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group includes:

[0052] Obtaining a first acceleration admittance function curve group and a second acceleration admittance function curve group of the seat belt retractor installation point, wherein the first acceleration admittance function curve group is an acceleration admittance function curve obtained by performing an acceleration test on a vehicle without abnormal noise, and the second acceleration admittance function curve group is an acceleration admittance function curve obtained by performing an acceleration test on a vehicle with abnormal noise;

[0053] A first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group are calculated according to the first acceleration admittance function curve group and the second acceleration admittance function curve group.

[0054] Specifically, when testing and calculating the installation point stiffness of the seat belt retractor of a sample vehicle, the present application uses, as an example, Figure 1 The seat belt retractor is separated from the body sheet metal, and a vibration test is performed on the mounting hole on the body sheet metal separately, so as to independently analyze the performance of the sheet metal structure, that is, the mounting hole on the body sheet metal is used as the seat belt retractor mounting point, and the first acceleration admittance function curve group and the second acceleration admittance function curve group of the seat belt retractor mounting point are respectively tested by the sensor, wherein the first acceleration admittance function curve group is the acceleration admittance function curve obtained by performing an acceleration test on a vehicle without abnormal sound, and the second acceleration admittance function curve group is the acceleration admittance function curve obtained by performing an acceleration test on a vehicle with abnormal sound. The acceleration admittance function curve of the seat belt retractor mounting point of the present application is as follows: Figure 3 As shown in the figure, since the acceleration analysis frequency range is 20Hz~500Hz, f i The acceleration admittance at frequency is ai , so the relationship between the two is:

[0055]

[0056] Depend on Figure 2 It can be seen that the envelope area S enclosed by the curve and the horizontal and vertical axes of the coordinate system is:

[0057]

[0058] Then the installation point stiffness of the seat belt retractor is:

[0059]

[0060] Among them, a i Represented as f i Acceleration admittance at frequency, Expressed as the acceleration of the excitation point, F i (ω) is the force applied at the excitation point, and ω is the angular frequency, which can be expressed as 2πf i Instead, f i Expressed as frequency, K i Expressed as frequency f i The corresponding dynamic stiffness, S is represented by the envelope area of ​​the curve and the horizontal and vertical axes of the coordinate system, △f is represented by the acceleration analysis frequency range of 20Hz~500Hz, K d Represents the inching stiffness of the seat belt retractor installation.

[0061] It can be seen from formula (5) that the installation point dynamic stiffness of the seat belt retractor is inversely proportional to the envelope area of ​​the acceleration admittance function curve, that is, the greater the acceleration vibration response, the larger the envelope area S, and the installation point dynamic stiffness K of the seat belt retractor is d The lower the acceleration vibration response, the smaller the envelope area S, and the seat belt retractor installation point dynamic stiffness K d Therefore, after obtaining the first acceleration admittance function curve group and the second acceleration admittance function curve group of the seat belt retractor installation point, the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group are calculated respectively according to the first acceleration admittance function curve group and the second acceleration admittance function curve group through the above calculation formula.

[0062] As an optional embodiment, determining the critical value of the installation inching stiffness when the seat belt retractor has an abnormal noise problem includes:

[0063] Calculating an intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group;

[0064] According to the intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group, the average value of the installation point dynamic stiffness in the intersection is calculated to obtain the installation point dynamic stiffness critical value when the seat belt retractor has an abnormal noise problem.

[0065] Specifically, the installation point dynamic stiffness of the vehicles without abnormal noise in the vehicle set N1 without abnormal noise is calculated and recorded as the first installation point dynamic stiffness value group: K1, K2, ..., K k ; Calculate the installation point dynamic stiffness of the abnormal noise problem vehicle in the abnormal noise vehicle set N2, and record the second installation point dynamic stiffness value group K k+1 , K k+2 , …, K n , in general, the higher the value of the seat belt retractor installation point dynamic stiffness, the lower the probability of abnormal noise. The seat belt retractor installation point dynamic stiffness value of vehicles without abnormal noise is generally higher than that of vehicles with abnormal noise. When the number of sample vehicles is large enough, the seat belt retractor installation point dynamic stiffness corresponding to the vehicle set N1 without abnormal noise and the vehicle set N2 with abnormal noise must have the same value. These same values ​​are the critical values ​​of the installation point dynamic stiffness when the seat belt retractor has abnormal noise problems. That is, if it is greater than these critical values ​​of the installation point dynamic stiffness, the risk of abnormal noise in the seat belt retractor is low; if it is less than or equal to these critical values ​​of the installation point dynamic stiffness, the risk of abnormal noise in the seat belt retractor is high. Then, the set composed of the same seat belt retractor installation point dynamic stiffness is set as B:

[0066] B=[K1,K2,…,K k ]∩[K k+1 , K k+2 , …, K n ](6)

[0067] Among them, K1, K2, ..., K k is the first installation point dynamic stiffness value group, that is, the installation point dynamic stiffness corresponding to the vehicle set N1 without abnormal noise, K k+1 , K k+2 , …, K n is the second installation point dynamic stiffness value group, that is, the installation point dynamic stiffness corresponding to the abnormal noise vehicle set N2, and B is the intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group. Then, according to the intersection B between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group, the average value of the installation point dynamic stiffness in the intersection B is calculated to obtain the critical value of the installation point dynamic stiffness when the seat belt retractor has an abnormal noise problem. The calculation formula is as follows:

[0068]

[0069] Among them, |B| is the sum of all installation point dynamic stiffness elements in the intersection set B, and card(B) is the number of installation point dynamic stiffness elements in the intersection set B.

[0070] It should be noted that the parameter values ​​of the installation modal frequency and the installation point dynamic stiffness in the above embodiment may also be values ​​of other orders of tests, and specific tests can be performed according to actual conditions, and this application does not impose any limitation on this.

[0071] In an embodiment of the present invention, a sufficient number of sample vehicles are studied to classify vehicles with abnormal seat belt retractor noise and vehicles without abnormal seat belt retractor noise. The seat belt retractor installation point dynamic stiffness and installation modal frequency are tested on all sample vehicles, and the two parameters are used as key indicators of whether the seat belt retractor has abnormal seat belt retractor noise. The ranges of two key indicators of the first installation point dynamic stiffness value group and the first installation modal frequency value group of vehicles without abnormal seat belt retractor noise, and the ranges of two key indicators of the second installation point dynamic stiffness value group and the second installation modal frequency value group of vehicles with abnormal seat belt retractor noise are determined through data statistics. The average value of the installation modal frequency in the intersection set A and the average value of the installation point dynamic stiffness elements in the intersection set B are solved, and finally the installation point dynamic stiffness critical value and the installation modal frequency critical value when the seat belt retractor has abnormal seat belt retractor noise are confirmed, and the two values ​​are used as parameters for determining whether the seat belt retractor has abnormal seat belt retractor noise.

[0072] S202: Calculating the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle based on the finite element model of the target vehicle.

[0073] In the embodiment of the present application, a target vehicle finite element model for calculating and solving the seat belt retractor installation modal frequency and installation point dynamic stiffness is also established in advance. Based on the target vehicle finite element model, the node number of the seat belt retractor installation point is defined, and a unit force of 20 Hz to 500 Hz is applied to the installation point to solve the acceleration vibration response curve of the seat belt retractor installation point. Then, the installation point dynamic stiffness value of the seat belt retractor is calculated according to the acceleration vibration response curve of the seat belt retractor installation point through the above formulas (3), (4) and (5), and is set as K. By establishing a body sheet metal finite element model, the position and size of the mounting holes of the seat belt retractor and the body sheet metal are determined. These mounting holes usually fix the seat belt retractor to the body structure. By creating holes at the corresponding positions of the target vehicle finite element model and the body sheet metal model, it is ensured that the position and size of the holes match the actual mounting holes. The finite element analysis software is used to determine the connection relationship between the holes in the target vehicle finite element model and the holes in the body sheet metal finite element model. By defining the modal analysis condition and using the analysis frequency of 20Hz-200Hz, the installation modal frequency value of the seat belt retractor is calculated and set as f.

[0074] In this embodiment, the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle are calculated based on the finite element model of the target vehicle, so that the calculation result can be compared with the installation modal frequency critical value and the installation point dynamic stiffness critical value when the seat belt retractor has abnormal noise problem, thereby quickly and accurately predicting the risk of abnormal noise of the seat belt retractor in the design stage, which is conducive to making design changes in advance, thereby preventing the risk of abnormal noise after mass production.

[0075] S203: Compare the installation modal frequency value with the installation modal frequency critical value, and compare the installation point dynamic stiffness value with the installation point dynamic stiffness critical value to determine the abnormal noise risk of the seat belt retractor.

[0076] As an optional embodiment, determining the risk of abnormal noise of a seat belt retractor includes:

[0077] If the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has no abnormal noise risk;

[0078] If the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk;

[0079] If the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk;

[0080] If the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk.

[0081] Specifically, the present application determines the abnormal noise risk prediction of the seat belt retractor by comparing the installation modal frequency value with the installation modal frequency critical value, and comparing the installation point dynamic stiffness value with the installation point dynamic stiffness critical value. When the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has no abnormal noise risk; when the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk; when the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk; when the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk. That is, when: There is no risk of abnormal noise from the seat belt retractor when: There is a risk of abnormal noise from the seat belt retractor when: There is a risk of abnormal noise from the seat belt retractor when: There is a risk of abnormal noise from the seat belt retractor.

[0082] In the embodiment of the present application, only when the installation modal frequency value and the installation point dynamic stiffness value calculated by the finite element model are greater than the installation modal frequency critical value and the installation point dynamic stiffness critical value when the seat belt retractor makes abnormal noise, it is determined that the vehicle in the development state has no risk of abnormal seat belt retractor noise; under other conditions, the vehicle may have abnormal seat belt retractor noise problems after mass production, and the data needs to be designed and optimized. When the installation point dynamic stiffness is low, it is necessary to strengthen the body sheet metal hardness, increase ribs or increase the support structure; when the installation modal frequency is low, it is necessary to optimize the seat belt retractor installation method and the retractor mass distribution and internal structure.

[0083] It should be noted that the installation modal frequency value, installation point dynamic stiffness value, installation modal frequency critical value and installation point dynamic stiffness critical value in this application can also be other values, which can be set according to actual conditions, and this application does not impose any limitations on this.

[0084] In the embodiment of the present application, during the development of a certain vehicle model, at the detailed design stage of the seat belt retractor and the body sheet metal, the target vehicle finite element calculation model of the seat belt retractor installation point dynamic stiffness and installation modal frequency can be used to obtain the seat belt retractor installation modal frequency value and installation point dynamic stiffness value of the target vehicle, and then the finite element calculation results are compared and analyzed with the installation modal frequency critical value and installation point dynamic stiffness critical value when the seat belt retractor produces abnormal noise, so as to predict the possibility of abnormal noise from the seat belt retractor and timely optimize the structural design, so as to avoid the risk of abnormal noise after mass production of the vehicle during the design stage.

[0085] In summary, the present invention provides a method, device, equipment and medium for predicting abnormal noise of a seat belt retractor, by obtaining the installation modal frequency critical value and the installation point dynamic stiffness critical value when the seat belt retractor has an abnormal noise problem, wherein the installation modal frequency critical value and the installation point dynamic stiffness critical value are obtained by performing an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively, and based on a finite element model of a target vehicle, calculating the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle, comparing the installation modal frequency value with the installation modal frequency critical value, and comparing the installation point dynamic stiffness value with the installation point dynamic stiffness critical value, to determine the abnormal noise risk of the seat belt retractor. This application uses a finite element model of a target vehicle to calculate the installation modal frequency value and the installation point stiffness value of a seat belt retractor during the vehicle development process, and compares and analyzes the calculation results with the installation modal frequency critical value and the installation point stiffness critical value when the seat belt retractor makes abnormal noise. This allows for rapid and accurate prediction of the risk of abnormal noise from the seat belt retractor, and for early structural optimization suggestions to avoid potential abnormal noise problems in the design stage, thereby effectively avoiding abnormal noise problems in seat belt retractors of mass-produced vehicles.

[0086] See also Figure 4 , Figure 4 1 is a schematic diagram of the structure of a device for predicting abnormal noise of a seat belt retractor provided in an embodiment of the present invention. The modules included in the device in this embodiment are used to execute Figure 2 For details, please refer to the steps in the corresponding embodiment. Figure 2 For the convenience of explanation, only the parts related to this embodiment are shown. Figure 4 The device 40 for predicting abnormal noise of a seat belt retractor includes: an acquisition module 41 , a calculation module 42 , and a comparison module 44 .

[0087] An acquisition module 41 is used to acquire a critical value of an installation modal frequency and a critical value of an installation point dynamic stiffness when an abnormal noise problem occurs in a seat belt retractor, wherein the critical value of the installation modal frequency and the critical value of the installation point dynamic stiffness are obtained based on an installation modal test and an installation point dynamic stiffness test of a sample vehicle, respectively;

[0088] A calculation module 42, used for calculating the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle based on the finite element model of the target vehicle;

[0089] The comparison module 44 is used to compare the installation modal frequency value with the installation modal frequency critical value, and to compare the installation point dynamic stiffness value with the installation point dynamic stiffness critical value, so as to determine the abnormal noise risk of the seat belt retractor.

[0090] Optionally, the acquisition module 41 is specifically used for:

[0091] Obtaining a first installation modal frequency value group and a second installation modal frequency value group, wherein the first installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle without abnormal noise, and the second installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle with abnormal noise;

[0092] Determining, according to the first installation modal frequency value group and the second installation modal frequency value group, a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor;

[0093] Obtaining a first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group, wherein the first installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle without abnormal noise, and the second installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle with abnormal noise;

[0094] The critical value of the installation inching stiffness when an abnormal noise problem occurs in the seat belt retractor is determined according to the first installation inching stiffness value group and the second installation inching stiffness value group.

[0095] Optionally, the acquisition module 41 is further used for:

[0096] Calculating an intersection between the first installation modal frequency value group and the second installation modal frequency value group;

[0097] According to the intersection between the first installation modal frequency value group and the second installation modal frequency value group, the average value of the installation modal frequencies in the intersection is calculated to obtain a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor.

[0098] Optionally, the acquisition module 41 is further used for:

[0099] Obtaining a first acceleration admittance function curve group and a second acceleration admittance function curve group of the seat belt retractor installation point, wherein the first acceleration admittance function curve group is an acceleration admittance function curve obtained by performing an acceleration test on a vehicle without abnormal noise, and the second acceleration admittance function curve group is an acceleration admittance function curve obtained by performing an acceleration test on a vehicle with abnormal noise;

[0100] A first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group are calculated according to the first acceleration admittance function curve group and the second acceleration admittance function curve group.

[0101] Optionally, the acquisition module 41 is further used for:

[0102] Calculating an intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group;

[0103] According to the intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group, the average value of the installation point dynamic stiffness in the intersection is calculated to obtain the installation point dynamic stiffness critical value when the seat belt retractor has an abnormal noise problem.

[0104] Optionally, the comparison module 44 is specifically used for:

[0105] If the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has no abnormal noise risk;

[0106] If the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk;

[0107] If the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk;

[0108] If the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk.

[0109] It should be noted that the information interaction, execution process and other contents between the above modules are based on the same concept as the embodiment of the method of the present invention. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0110] Figure 5Schematic diagram of the structure of a computer device provided by an embodiment of the present invention. Figure 5 As shown, the computer device of this embodiment includes a processor, a memory, a network interface and a database connected through a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. When the computer program is executed by the processor, the steps in any of the above-mentioned embodiments of the method for predicting abnormal noise of the seat belt retractor are implemented.

[0111] The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that Figure 5 This is only an example of a computer device and does not constitute a limitation on the computer device. The computer device may include more or fewer components than shown in the figure, or combine certain components, or different components. In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0112] Obtaining a critical value of the installation modal frequency and a critical value of the installation point dynamic stiffness when an abnormal noise problem occurs in the seat belt retractor, wherein the critical value of the installation modal frequency and the critical value of the installation point dynamic stiffness are obtained based on an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively;

[0113] Based on the finite element model of the target vehicle, the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle are calculated;

[0114] The installation modal frequency value is compared with the installation modal frequency critical value, and the installation inching stiffness value is compared with the installation inching stiffness critical value to determine the abnormal noise risk of the seat belt retractor.

[0115] In one embodiment, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor in a computer device, the computer device can execute the steps of any embodiment of a method for predicting abnormal noise of a seat belt retractor disclosed in the present invention, which will not be repeated here. The computer-readable storage medium can be non-volatile or volatile.

[0116] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0117] The processor may be a CPU, or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0118] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned device can refer to the corresponding process in the above-mentioned method embodiment, which will not be repeated here. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0119] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for predicting abnormal noise of a seat belt retractor, characterized in that: include: Obtaining a critical value of the installation modal frequency and a critical value of the installation point dynamic stiffness when an abnormal noise problem occurs in the seat belt retractor, wherein the critical value of the installation modal frequency and the critical value of the installation point dynamic stiffness are obtained based on an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively; Based on the finite element model of the target vehicle, the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle are calculated; The installation modal frequency value is compared with the installation modal frequency critical value, and the installation inching stiffness value is compared with the installation inching stiffness critical value to determine the abnormal noise risk of the seat belt retractor.

2. The method for predicting abnormal noise of a seat belt retractor according to claim 1, characterized in that: The step of obtaining the critical value of the installation modal frequency and the critical value of the installation jog stiffness when the seat belt retractor has an abnormal noise problem includes: Obtaining a first installation modal frequency value group and a second installation modal frequency value group, wherein the first installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle without abnormal noise, and the second installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle with abnormal noise; Determining, according to the first installation modal frequency value group and the second installation modal frequency value group, a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor; Obtaining a first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group, wherein the first installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle without abnormal noise, and the second installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle with abnormal noise; The critical value of the installation inching stiffness when an abnormal noise problem occurs in the seat belt retractor is determined according to the first installation inching stiffness value group and the second installation inching stiffness value group.

3. The method for predicting abnormal noise of a seat belt retractor according to claim 2, characterized in that: The step of determining the critical value of the installation modal frequency when the seat belt retractor has an abnormal sound problem according to the first installation modal frequency value group and the second installation modal frequency value group includes: Calculating an intersection between the first installation modal frequency value group and the second installation modal frequency value group; According to the intersection between the first installation modal frequency value group and the second installation modal frequency value group, the average value of the installation modal frequencies in the intersection is calculated to obtain a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor.

4. The method for predicting abnormal noise of a seat belt retractor according to claim 2, characterized in that: The obtaining of the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group comprises: Obtaining a first acceleration admittance function curve group and a second acceleration admittance function curve group of the seat belt retractor installation point, wherein the first acceleration admittance function curve group is an acceleration admittance function curve obtained by performing an acceleration test on a vehicle without abnormal noise, and the second acceleration admittance function curve group is an acceleration admittance function curve obtained by performing an acceleration test on a vehicle with abnormal noise; A first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group are calculated according to the first acceleration admittance function curve group and the second acceleration admittance function curve group.

5. The method for predicting abnormal noise of a seat belt retractor according to claim 2, characterized in that: The step of determining the critical value of the installation inching stiffness when the seat belt retractor has an abnormal noise problem according to the first installation inching stiffness value group and the second installation inching stiffness value group comprises: Calculating an intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group; According to the intersection between the first installation point dynamic stiffness value group and the second installation point dynamic stiffness value group, the average value of the installation point dynamic stiffness in the intersection is calculated to obtain the installation point dynamic stiffness critical value when the seat belt retractor has an abnormal noise problem.

6. The method for predicting abnormal noise of a seat belt retractor according to claim 1, characterized in that: The step of comparing the installation modal frequency value with the installation modal frequency critical value, and comparing the installation inching stiffness value with the installation inching stiffness critical value to determine the abnormal noise risk of the seat belt retractor includes: If the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has no abnormal noise risk; If the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is greater than the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk; If the installation modal frequency value is greater than the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk; If the installation modal frequency value is less than or equal to the installation modal frequency critical value, and the installation point dynamic stiffness value is less than or equal to the installation point dynamic stiffness critical value, it is determined that the seat belt retractor has an abnormal noise risk.

7. A device for predicting abnormal noise of a seat belt retractor, characterized in that: include: An acquisition module, used to acquire an installation modal frequency critical value and an installation point dynamic stiffness critical value when an abnormal noise problem occurs in a seat belt retractor, wherein the installation modal frequency critical value and the installation point dynamic stiffness critical value are obtained based on an installation modal test and an installation point dynamic stiffness test on a sample vehicle, respectively; A calculation module, used for calculating the installation modal frequency value and the installation point dynamic stiffness value of the seat belt retractor of the target vehicle based on the finite element model of the target vehicle; A comparison module is used to compare the installation modal frequency value with the installation modal frequency critical value, and to compare the installation point dynamic stiffness value with the installation point dynamic stiffness critical value, so as to determine the abnormal noise risk of the seat belt retractor.

8. The device for predicting abnormal noise of a seat belt retractor according to claim 7, characterized in that: The acquisition module is used to: Obtaining a first installation modal frequency value group and a second installation modal frequency value group, wherein the first installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle without abnormal noise, and the second installation modal frequency value group is the installation modal frequency obtained by performing an installation modal test on a vehicle with abnormal noise; Determining, according to the first installation modal frequency value group and the second installation modal frequency value group, a critical value of the installation modal frequency when an abnormal sound problem occurs in the seat belt retractor; Obtaining a first installation point dynamic stiffness value group and a second installation point dynamic stiffness value group, wherein the first installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle without abnormal noise, and the second installation point dynamic stiffness value group is the installation point dynamic stiffness obtained by performing an installation point dynamic stiffness test on a vehicle with abnormal noise; The critical value of the installation inching stiffness when an abnormal noise problem occurs in the seat belt retractor is determined according to the first installation inching stiffness value group and the second installation inching stiffness value group.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for predicting abnormal noise of a seat belt retractor according to any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for predicting abnormal noise of a seat belt retractor according to any one of claims 1 to 6 is implemented.

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