Knurled heat shield equivalent thickness conversion method, device, equipment and storage medium

Abstract

The present invention relates to the technical field of knurled heat shields, and discloses a knurled heat shield equivalent thickness conversion method, device, equipment and storage medium, the method comprising: obtaining a finite element model of a knurled aluminum plate of a first preset thickness; performing modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate; comparing the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of preset thickness flat plate model aluminum plates to obtain a target comparison result; determining an equivalent thickness flat plate model aluminum plate according to the target comparison result. By comparing the frequency and vibration shape, the equivalent flat plate thickness corresponding to a knurled plate of a certain material with a certain thickness is found, so that the equivalent flat plate thickness corresponding to a knurled plate of a certain material with a certain thickness is found through effective equivalent thickness conversion, so as to cover all material types and size specifications.

Description

Technical Field

[0001] The invention relates to the technical field of knurled heat shields, and in particular to a method, device, equipment and storage medium for converting equivalent thickness of a knurled heat shield. Background Art

[0002] When the temperature of the exhaust peripheral parts is higher than the temperature resistance requirement, it is necessary to add a heat shield. The heat shield material is usually knurled thin aluminum plate or aluminum foil. The knurling process significantly increases the stiffness of the heat shield without changing the weight. The surface area of ​​the aluminum plate increases after knurling, which is conducive to improving the heat dissipation efficiency, so the thermal insulation performance is also improved. Due to the complex geometry of the knurled aluminum plate, it is not convenient to create a three-dimensional model and finite element analysis. In order to simplify the modeling process, the three-dimensional model of the knurled aluminum plate can be replaced by a flat plate of a certain thickness, and the finite element analysis is performed using the flat plate model. Due to the contradiction of "it is difficult to model and analyze without simplification, and the structural performance after simplification is inconsistent with the actual situation", some manufacturers accumulate a large number of actual measured values ​​of the heat shield modal, and obtain the corresponding equivalent thickness. However, this method has great limitations and cannot cover all material types and size specifications.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a method, device, equipment and storage medium for converting the equivalent thickness of a knurled heat shield, aiming to solve the technical problem of how to find the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness through effective equivalent thickness conversion in the prior art, thereby achieving coverage of all material types and size specifications.

[0005] To achieve the above object, the present invention provides a method for converting the equivalent thickness of a knurled heat shield, the method comprising the following steps:

[0006] Obtaining a finite element model of a knurled aluminum plate of a first preset thickness;

[0007] Performing modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate;

[0008] Comparing the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of flat plate model aluminum plates of preset thickness to obtain a target comparison result;

[0009] The equivalent thickness of the flat plate model aluminum plate is determined according to the target comparison result.

[0010] Optionally, before obtaining the finite element model of the knurled aluminum plate with the first preset thickness, the method further includes:

[0011] Obtain the initial thickness of the flat model aluminum plate;

[0012] Performing a knurling process on the flat aluminum plate model with the initial thickness to obtain a knurled aluminum plate with a first preset thickness after knurling;

[0013] The step of obtaining a finite element model of a knurled aluminum plate of a first preset thickness comprises:

[0014] Call the preset meshing tool;

[0015] The knurled aluminum plate of the first preset thickness is meshed according to the preset meshing tool to establish a finite element model of the knurled aluminum plate of the first preset thickness.

[0016] Optionally, performing a knurling process on the flat model aluminum plate of the initial thickness to obtain a knurled aluminum plate of a first preset thickness after knurling comprises:

[0017] Get the average thinning rate of the knurling process;

[0018] A knurling process is performed on the flat model aluminum plate of the initial thickness based on the average thinning rate to obtain a knurled aluminum plate of a first preset thickness after knurling.

[0019] Optionally, obtaining the average thinning rate of the knurling process includes:

[0020] Obtaining the surface area of ​​the flat model aluminum plate corresponding to the preset knurled aluminum plate and the surface area of ​​the knurled aluminum plate determined by the preset modeling tool;

[0021] The average thinning rate of the knurling process is determined according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate.

[0022] Optionally, the calculation formula for determining the average thinning rate of the knurling process according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate is:

[0023]

[0024] Wherein, n represents the average thinning rate, S2 represents the surface area of ​​the flat plate model, and S1 represents the surface area of ​​the knurled model.

[0025] Optionally, before comparing the first modal frequency and the first modal vibration shape with the second modal frequencies and the second modal vibration shapes of a plurality of flat plate model aluminum plates of preset thicknesses to obtain a target comparison result, the method further includes:

[0026] Establishing a plurality of finite element models of flat aluminum plates with preset thicknesses by using the preset meshing tool;

[0027] A modal analysis is performed on the finite element models of the plurality of flat aluminum plates with preset thicknesses according to a preset model analysis tool to obtain second modal frequencies and second modal vibration shapes of the plurality of flat aluminum plates with preset thicknesses.

[0028] Optionally, comparing the first modal frequency and the first modal vibration shape with the second modal frequencies and the second modal vibration shapes of a plurality of flat plate model aluminum plates of preset thicknesses to obtain a target comparison result includes:

[0029] Comparing the first modal frequency of the first preset order with the second modal frequency of the first preset order to determine a first comparison result;

[0030] Comparing the first mode vibration shape of the second preset order with the second mode vibration shape of the second preset order to determine a second comparison result;

[0031] A target comparison result is determined according to the first comparison result and the second comparison result.

[0032] In addition, in order to achieve the above-mentioned purpose, the present invention also proposes a knurled heat shield equivalent thickness conversion device, the knurled heat shield equivalent thickness conversion device comprising:

[0033] A model building module, used for obtaining a finite element model of a knurled aluminum plate of a first preset thickness;

[0034] A modal analysis module, used for performing modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate;

[0035] A modal comparison module, used for comparing the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of flat plate model aluminum plates of preset thickness to obtain a target comparison result;

[0036] The thickness determination module is used to determine the equivalent thickness of the flat plate model aluminum plate according to the target comparison result.

[0037] In addition, to achieve the above-mentioned purpose, the present invention also proposes a knurled heat shield equivalent thickness conversion device, the knurled heat shield equivalent thickness conversion device comprising: a memory, a processor, and a knurled heat shield equivalent thickness conversion program stored in the memory and executable on the processor, the knurled heat shield equivalent thickness conversion program being configured to implement the steps of the knurled heat shield equivalent thickness conversion method as described above.

[0038] In addition, to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which is stored a knurled heat shield equivalent thickness conversion program, and when the knurled heat shield equivalent thickness conversion program is executed by a processor, the steps of the knurled heat shield equivalent thickness conversion method described above are implemented.

[0039] The present invention obtains a finite element model of a knurled aluminum plate of a first preset thickness; performs modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate; compares the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of preset thickness flat plate model aluminum plates to obtain a target comparison result; and determines an equivalent thickness flat plate model aluminum plate according to the target comparison result. By comparing the frequency and vibration shape, the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness is found, and thus the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness is found by converting the effective equivalent thickness, so as to cover all material types and size specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of a knurled heat shield equivalent thickness conversion device in a hardware operating environment involved in an embodiment of the present invention;

[0041] Figure 2 It is a schematic flow chart of a first embodiment of a method for converting equivalent thickness of a knurled heat shield according to the present invention;

[0042] Figure 3 It is a flow chart of a second embodiment of the method for converting the equivalent thickness of a knurled heat shield of the present invention;

[0043] Figure 4 The vibration mode diagram of the knurled aluminum plate of an embodiment of the method for converting the equivalent thickness of the knurled heat shield of the present invention;

[0044] Figure 5 A vibration mode diagram of a flat plate model aluminum plate according to an embodiment of a method for converting equivalent thickness of a knurled heat shield of the present invention;

[0045] Figure 6 It is a structural block diagram of the first embodiment of the knurled heat shield equivalent thickness conversion device of the present invention.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0048] Reference Figure 1 , Figure 1 It is a schematic diagram of the structure of a knurled heat shield equivalent thickness conversion device in the hardware operating environment involved in the embodiment of the present invention.

[0049] like Figure 1As shown, the knurled heat shield equivalent thickness conversion device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0050] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the knurled heat shield equivalent thickness conversion device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0051] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a knurled heat shield equivalent thickness conversion program.

[0052] exist Figure 1 In the knurled heat shield equivalent thickness conversion device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the knurled heat shield equivalent thickness conversion device of the present invention can be arranged in the knurled heat shield equivalent thickness conversion device, and the knurled heat shield equivalent thickness conversion device calls the knurled heat shield equivalent thickness conversion program stored in the memory 1005 through the processor 1001, and executes the knurled heat shield equivalent thickness conversion method provided in the embodiment of the present invention.

[0053] The embodiment of the present invention provides a method for converting the equivalent thickness of a knurled heat shield, referring to Figure 2 , Figure 2 The figure is a flow chart of a first embodiment of a method for converting equivalent thickness of a knurled heat shield according to the present invention.

[0054] In this embodiment, the method for converting the equivalent thickness of the knurled heat shield includes the following steps:

[0055] Step S10: Obtain a finite element model of a knurled aluminum plate of a first preset thickness.

[0056] It should be noted that the executor of this embodiment may be a knurled heat shield equivalent thickness conversion device, or other devices that can achieve the same or similar functions. This embodiment does not limit this. In this embodiment, the knurled heat shield equivalent thickness conversion device is taken as an example for explanation.

[0057] It is easy to understand that the first preset thickness can be set by a person skilled in the art, and the present embodiment does not limit this. The knurled aluminum plate of the first preset thickness is the thickness of the knurled aluminum plate after knurling obtained by performing a knurling process on a flat model aluminum plate of an initial thickness. Since the thickness of the more commonly used knurled heat shield is determined based on a 0.5 mm flat model aluminum plate subjected to a knurling process, the initial thickness of 0.5 mm can be used as an example for explanation in the specific implementation process. The corresponding first preset thickness can be the thickness after knurling obtained by performing a knurling process on a 0.5 mm flat model aluminum plate.

[0058] In the specific implementation process, aluminum plate material is used for description, and other materials can also be used for description according to this embodiment, and this embodiment does not limit this.

[0059] Step S20: performing modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate.

[0060] It should be noted that by calling the preset analysis solver to perform modal analysis on the finite element model of the knurled aluminum plate, the first modal frequency and the first modal vibration shape of the knurled aluminum plate under actual thickness can be calculated. In the specific implementation process, the preset analysis solver can be an optistruct solver, and the optistruct solver is used to perform free modal analysis on the knurled aluminum plate to obtain the first modal frequency and the first modal vibration shape of the knurled aluminum plate.

[0061] Step S30: comparing the first modal frequency and the first modal vibration shape with the second modal frequencies and the second modal vibration shapes of a plurality of flat plate model aluminum plates of preset thicknesses to obtain a target comparison result.

[0062] It should be noted that a plurality of preset thicknesses of flat-plate model aluminum plates can be set by those skilled in the art, and this embodiment does not limit this, for example, a 0.6 mm flat-plate model aluminum plate, a 0.7 mm flat-plate model aluminum plate, or a 0.8 mm flat-plate model aluminum plate.

[0063] It is understandable that by performing finite element modal analysis on multiple flat-plate model aluminum plates of preset thicknesses through hypermesh software and optistruct solver, the second modal frequencies and second modal vibration modes of multiple flat-plate model aluminum plates of preset thicknesses can be obtained, thereby comparing the first modal frequency of the knurled aluminum plate with the second modal frequencies of multiple flat-plate model aluminum plates of preset thicknesses and comparing the first modal vibration modes of the knurled aluminum plate with the second modal vibration modes of multiple flat-plate model aluminum plates of preset thicknesses, thereby obtaining the target comparison result. Among them, in the specific comparison process, based on the degree of proximity between the two, a certain flat-plate model aluminum plate of preset thickness with the highest comprehensive degree of proximity to the first modal frequency and the first modal vibration mode can be used as the target comparison result.

[0064] It is easy to understand that, for example, if a knurling process is performed on a 0.5mm flat plate model aluminum plate to obtain a knurled aluminum plate, and the knurling modeling and modal analysis of the knurled aluminum plate obtain the first modal frequency and the first modal vibration shape, by comparison, it can be seen that the first modal frequency and the first modal vibration shape of the knurled aluminum plate are almost completely consistent with the second modal frequency and the second mode obtained by modeling and modal analysis of a 0.7mm flat plate model aluminum plate, and the degree of closeness is the highest. Therefore, the 0.7mm flat plate model aluminum plate can be used as the target comparison result.

[0065] Furthermore, before step S30, the method further includes:

[0066] A plurality of finite element models of aluminum plates with flat plate models of preset thickness are established by the preset meshing tool; a modal analysis is performed on the finite element models of aluminum plates with flat plate models of preset thickness according to the preset model analysis tool to obtain the second modal frequencies and second modal vibration shapes of the plurality of aluminum plates with flat plate models of preset thickness.

[0067] It should be noted that the preset meshing tool may be a hypermesh tool, and the hypermesh tool is called to mesh a plurality of flat plate model aluminum plates of preset thicknesses, thereby establishing finite element models of a plurality of flat plate model aluminum plates of preset thicknesses. Then, based on the optistruct solver, finite element modal analysis is performed on the finite element models of the plurality of flat plate model aluminum plates of preset thicknesses, thereby obtaining the second modal frequencies and second modal vibration shapes of the plurality of flat plate model aluminum plates of preset thicknesses.

[0068] Step S40: determining an equivalent thickness flat plate model aluminum plate according to the target comparison result.

[0069] It can be understood that, for example, by comparing the 0.7mm flat plate model aluminum plate as the target comparison result, that is, by comparing, it is found that the frequency and vibration mode obtained after the 0.5mm flat plate is knurled are almost completely consistent with the 0.7mm flat plate. Therefore, it can be judged that the structural performance of the 0.5mm flat plate after knurling is similar to that of the 0.7mm flat plate. Therefore, the 0.7mm flat plate model aluminum plate can be equivalent to a flat plate whose frequency and vibration mode are consistent with the knurled aluminum plate after knurling, which is the corresponding equivalent thickness.

[0070] This embodiment obtains a finite element model of a knurled aluminum plate of a first preset thickness; performs modal analysis on the finite element model of the knurled aluminum plate to obtain the first modal frequency and the first modal vibration shape of the knurled aluminum plate; compares the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of preset thickness flat plate model aluminum plates to obtain a target comparison result; determines the equivalent thickness flat plate model aluminum plate according to the target comparison result. By comparing the frequency and vibration shape, the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness is found, and thus the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness is found by converting the effective equivalent thickness, so as to cover all material types and size specifications.

[0071] refer to Figure 3 , Figure 3 The figure is a flow chart of a second embodiment of a method for converting the equivalent thickness of a knurled heat shield according to the present invention.

[0072] Based on the first embodiment described above, the method for converting the equivalent thickness of the knurled heat shield in this embodiment further includes, before step S10:

[0073] Step S101 ′: obtaining a flat model aluminum plate of initial thickness.

[0074] It should be understood that the initial thickness of the flat model aluminum plate can be set by those skilled in the art, and this embodiment does not limit this. Since the thickness of the more commonly used knurled heat shield is determined based on the knurling process of a flat model aluminum plate of 0.5 mm, the initial thickness of 0.5 mm can be used as an example for explanation in the specific implementation process.

[0075] Step S102': performing a knurling process on the flat aluminum plate model with the initial thickness to obtain a knurled aluminum plate with a first preset thickness after knurling.

[0076] Furthermore, the step S102' includes:

[0077] The average thinning rate of the knurling process is obtained; the knurling process is performed on the flat model aluminum plate of the initial thickness based on the average thinning rate to obtain a knurled aluminum plate of a first preset thickness after knurling.

[0078] It is easy to understand that since the knurling process on the aluminum plate will cause material thinning, the thickness of the knurled aluminum plate obtained by performing the knurling process on the flat plate model of the initial thickness will be relatively adjusted. Therefore, the first preset thickness of the knurled aluminum plate after knurling obtained by performing the knurling process on the flat plate model aluminum plate of the initial thickness can be calculated based on the average thinning rate of the knurling process.

[0079] Furthermore, the average thinning rate of the knurling process is obtained, including:

[0080] The surface area of ​​the flat model aluminum plate corresponding to the preset knurled aluminum plate and the surface area of ​​the knurled aluminum plate determined by the preset modeling tool are obtained; and the average thinning rate of the knurling process is determined according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate.

[0081] It can be understood that the preset knurled aluminum plate can be a knurled aluminum plate after knurling created according to the actual knurling process, and the preset modeling tool can be a CATIA tool. The present embodiment does not limit this. By calling the measure inertia command in the CATIA tool and performing feature measurement on the preset knurled aluminum plate according to the measure inertia command, the surface area of ​​the knurled aluminum plate corresponding to the preset knurled aluminum plate and the surface area of ​​the flat model aluminum plate corresponding to the preset knurled aluminum plate before knurling can be directly measured in CATIA. Therefore, the average thinning rate of the knurling process can be determined based on the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate.

[0082] Furthermore, the calculation formula for determining the average thinning rate of the knurling process according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate is:

[0083]

[0084] It is easy to understand that, for example, a preset knurled aluminum plate with a size of 500 mm × 500 mm and a thickness of 0.5 mm is selected. The surface area of ​​the knurled aluminum plate after knurling is directly measured in CATIA as S1 = 0.307 m 2 The surface area of ​​the flat aluminum plate of the knurled aluminum plate model before the knurling process is S2 = 0.25m 2 , then the average thinning rate of the knurling process is:

[0085]

[0086] It should be understood that based on the principle that the volume of the material before and after knurling remains unchanged, after the knurling process is carried out through the average thinning rate, it can be calculated that the first preset thickness of the knurled aluminum plate after knurling of the 0.5mm flat model aluminum plate can be calculated to be 0.5*(1-n)=0.407mm, that is, the thickness is the actual thickness obtained after knurling the 0.5mm flat model aluminum plate.

[0087] Furthermore, the step S10 includes:

[0088] Step S101: calling a preset meshing tool.

[0089] It should be noted that the preset meshing tool may be a hypermesh tool, which is not limited in this embodiment.

[0090] Step S102: meshing the knurled aluminum plate of the first preset thickness according to the preset meshing tool, and establishing a finite element model of the knurled aluminum plate of the first preset thickness.

[0091] In the specific implementation process, a 500mm×500mm knurled aluminum plate can be created according to the knurling feature size, and then the 500mm×500mm knurled aluminum plate can be imported into the hypermesh tool for meshing to establish a finite element model. Since the knurling feature size is small, in order to ensure that the finite element model realistically reflects the knurling structure, the unit size needs to be small enough. The corresponding unit parameters and material properties can be entered in hypermesh, where the following Table 1 is the unit parameter table and Table 2 is the material property table:

[0092] Table 1

[0093] Unit Type Unit size Number of units QUAD4 0.5mm 1548214

[0094] Table 2

[0095] Material Type E elastic modulus uPoisson's ratio ρ Density t Actual thickness of knurled plate 1050-A1 <![CDATA[6.9×10 4 ]]> 0.33 <![CDATA[2.7×10 -9 ]]> 0.407mm

[0096] Furthermore, the step S30 includes:

[0097] Step S301: compare the first modal frequency of the first preset order with the second modal frequency of the first preset order to determine a first comparison result.

[0098] It is understandable that the first preset order can be the 12th order, and this embodiment does not limit this. Therefore, the first modal frequency of the first 12 orders can be compared with the second modal frequency of the first 12 orders. In the specific comparison process, the degree of proximity between the two can be measured. For example, by comparing the modal frequencies of the knurled aluminum plate with the first preset thickness of t=0.407 mm and the flat plate model aluminum plates with multiple preset thicknesses, as shown in Table 3 below, the modal frequency order comparison table of the first 12 orders of the knurled aluminum plate with the first preset thickness of t=0.407 mm and the flat plate with the preset thickness of t=0.7 mm. It can be seen that the degree of proximity between the two is the highest, and the first comparison result is the flat plate model with the preset thickness of t=0.7 mm.

[0099] Table 3

[0100]

[0101] Step S302: comparing the first mode vibration shape of the second preset order with the second mode vibration shape of the second preset order to determine a second comparison result.

[0102] It is easy to understand that the second preset order can be 6 orders, and this embodiment does not limit this. Therefore, the first modal vibration mode of the first 6 orders can be compared with the second modal vibration mode of the first 6 orders. In the specific comparison process, the degree of proximity between the two can be measured. For example, by comparing the modal vibration modes of a knurled aluminum plate with a first preset thickness of t=0.407 mm and a flat plate model with multiple preset thicknesses, such as Figure 4 The vibration mode diagram of the knurled aluminum plate of the first 6 orders is shown. Figure 5 The diagram shows the vibration mode diagram of the aluminum plate of the flat plate model of the first 6 orders of the t=0.7 mm flat plate model. It can be seen that the two are the closest. The second comparison result is the flat plate model with a preset thickness of t=0.7 mm.

[0103] Step S303: determining a target comparison result according to the first comparison result and the second comparison result.

[0104] It is easy to understand that the target comparison result can be obtained by comprehensively analyzing the first comparison result and the second comparison result. For example, it can be seen from the above that the modal frequencies and modal vibration shapes of the knurled aluminum plate with a first preset thickness of t=0.407 mm and the flat plate models with multiple preset thicknesses are compared. It can be seen that the knurled aluminum plate with a first preset thickness of t=0.407 mm is closest to the flat plate model with a preset thickness of t=0.7 mm. Therefore, the flat plate model with a preset thickness of t=0.7 mm can be used as the target comparison result.

[0105] This embodiment obtains a flat plate model aluminum plate of initial thickness; performs a knurling process according to the flat plate model aluminum plate of initial thickness to obtain a knurled aluminum plate of first preset thickness after knurling; meshes the knurled aluminum plate of first preset thickness according to the preset meshing tool to establish a finite element model of the knurled aluminum plate of first preset thickness; performs modal analysis on the finite element model of the knurled aluminum plate to obtain the first modal frequency and first modal vibration shape of the knurled aluminum plate; compares the first modal frequency of the first preset order with the second modal frequency of the first preset order to determine the first comparison result; compares the first modal vibration shape of the second preset order with the second modal vibration shape of the second preset order to determine the second comparison result; determines the target comparison result according to the first comparison result and the second comparison result; determines the equivalent thickness flat plate model aluminum plate according to the target comparison result. By comparing the frequency and vibration shape, the equivalent flat plate thickness corresponding to a knurled plate of a certain material with a certain thickness is found, so that the equivalent flat plate thickness corresponding to a knurled plate of a certain material with a certain thickness is found through effective equivalent thickness conversion, which effectively improves the coverage of all material types and size specifications.

[0106] In addition, an embodiment of the present invention further provides a storage medium, on which a knurled heat shield equivalent thickness conversion program is stored. When the knurled heat shield equivalent thickness conversion program is executed by a processor, the steps of the knurled heat shield equivalent thickness conversion method described above are implemented.

[0107] Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0108] Reference Figure 6 , Figure 6 It is a structural block diagram of the first embodiment of the knurled heat shield equivalent thickness conversion device of the present invention.

[0109] like Figure 6 As shown, the knurled heat shield equivalent thickness conversion device proposed in the embodiment of the present invention includes:

[0110] The model building module 10 is used to obtain a finite element model of a knurled aluminum plate with a first preset thickness.

[0111] It is easy to understand that the first preset thickness can be set by a person skilled in the art, and the present embodiment does not limit this. The knurled aluminum plate of the first preset thickness is the thickness of the knurled aluminum plate after knurling obtained by performing a knurling process on a flat model aluminum plate of an initial thickness. Since the thickness of the more commonly used knurled heat shield is determined based on a 0.5 mm flat model aluminum plate subjected to a knurling process, the initial thickness of 0.5 mm can be used as an example for explanation in the specific implementation process. The corresponding first preset thickness can be the thickness after knurling obtained by performing a knurling process on a 0.5 mm flat model aluminum plate.

[0112] In the specific implementation process, aluminum plate material is used for description, and other materials can also be used for description according to this embodiment, and this embodiment does not limit this.

[0113] The modal analysis module 20 is used to perform modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate.

[0114] It should be noted that by calling the preset analysis solver to perform modal analysis on the finite element model of the knurled aluminum plate, the first modal frequency and the first modal vibration shape of the knurled aluminum plate under actual thickness can be calculated. In the specific implementation process, the preset analysis solver can be an optistruct solver, and the optistruct solver is used to perform free modal analysis on the knurled aluminum plate to obtain the first modal frequency and the first modal vibration shape of the knurled aluminum plate.

[0115] The modal analysis module 30 is used to perform modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate.

[0116] It should be noted that a plurality of preset thicknesses of flat-plate model aluminum plates can be set by those skilled in the art, and this embodiment does not limit this, for example, a 0.6 mm flat-plate model aluminum plate, a 0.7 mm flat-plate model aluminum plate, or a 0.8 mm flat-plate model aluminum plate.

[0117] It is understandable that by performing finite element modal analysis on multiple flat-plate model aluminum plates of preset thicknesses through hypermesh software and optistruct solver, the second modal frequencies and second modal vibration modes of multiple flat-plate model aluminum plates of preset thicknesses can be obtained, thereby comparing the first modal frequency of the knurled aluminum plate with the second modal frequencies of multiple flat-plate model aluminum plates of preset thicknesses and comparing the first modal vibration modes of the knurled aluminum plate with the second modal vibration modes of multiple flat-plate model aluminum plates of preset thicknesses, thereby obtaining the target comparison result. Among them, in the specific comparison process, based on the degree of proximity between the two, a certain flat-plate model aluminum plate of preset thickness with the highest comprehensive degree of proximity to the first modal frequency and the first modal vibration mode can be used as the target comparison result.

[0118] It is easy to understand that, for example, if a knurling process is performed on a 0.5mm flat plate model aluminum plate to obtain a knurled aluminum plate, and the knurling modeling and modal analysis of the knurled aluminum plate obtain the first modal frequency and the first modal vibration shape, by comparison, it can be seen that the first modal frequency and the first modal vibration shape of the knurled aluminum plate are almost completely consistent with the second modal frequency and the second mode obtained by modeling and modal analysis of a 0.7mm flat plate model aluminum plate, and the degree of closeness is the highest. Therefore, the 0.7mm flat plate model aluminum plate can be used as the target comparison result.

[0119] The thickness determination module 40 is used to determine the equivalent thickness of the flat plate model aluminum plate according to the target comparison result.

[0120] It can be understood that, for example, by comparing the 0.7mm flat plate model aluminum plate as the target comparison result, that is, by comparing, it is found that the frequency and vibration mode obtained after the 0.5mm flat plate is knurled are almost completely consistent with the 0.7mm flat plate. Therefore, it can be judged that the structural performance of the 0.5mm flat plate after knurling is similar to that of the 0.7mm flat plate. Therefore, the 0.7mm flat plate model aluminum plate can be equivalent to a flat plate whose frequency and vibration mode are consistent with the knurled aluminum plate after knurling, which is the corresponding equivalent thickness.

[0121] This embodiment obtains a finite element model of a knurled aluminum plate of a first preset thickness; performs modal analysis on the finite element model of the knurled aluminum plate to obtain the first modal frequency and the first modal vibration shape of the knurled aluminum plate; compares the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of preset thickness flat plate model aluminum plates to obtain a target comparison result; determines the equivalent thickness flat plate model aluminum plate according to the target comparison result. By comparing the frequency and vibration shape, the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness is found, and thus the equivalent flat plate thickness corresponding to a knurled plate of a certain material and a certain thickness is found by converting the effective equivalent thickness, so as to cover all material types and size specifications.

[0122] In one embodiment, the model building module 10 is also used to obtain a flat model aluminum plate of initial thickness; perform a knurling process based on the flat model aluminum plate of initial thickness to obtain a knurled aluminum plate of a first preset thickness after knurling; call a preset meshing tool; mesh the knurled aluminum plate of the first preset thickness according to the preset meshing tool to establish a finite element model of the knurled aluminum plate of the first preset thickness.

[0123] In one embodiment, the model building module 10 is also used to obtain the average thinning rate of the knurling process; the knurling process is performed based on the average thinning rate according to the flat model aluminum plate of the initial thickness to obtain a knurled aluminum plate of the first preset thickness after knurling.

[0124] In one embodiment, the model building module 10 is also used to obtain the surface area of ​​the flat model aluminum plate corresponding to the preset knurled aluminum plate and the surface area of ​​the knurled aluminum plate determined by the preset modeling tool; and determine the average thinning rate of the knurling process based on the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate.

[0125] In one embodiment, the model building module 10 is also used to determine the average thinning rate of the knurling process according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate. The calculation formula is:

[0126]

[0127] Wherein, n represents the average thinning rate, S2 represents the surface area of ​​the flat model aluminum plate, and S1 represents the surface area of ​​the knurled aluminum plate.

[0128] In one embodiment, the modal analysis module 20 is also used to establish multiple finite element models of flat aluminum plates with preset thicknesses through the preset meshing tool; perform modal analysis on the multiple finite element models of flat aluminum plates with preset thicknesses according to the preset model analysis tool to obtain the second modal frequencies and second modal vibration shapes of the multiple flat aluminum plate models with preset thicknesses.

[0129] In one embodiment, the modal comparison module 30 is further used to compare the first modal frequency of the first preset order with the second modal frequency of the first preset order to determine a first comparison result; compare the first modal vibration shape of the second preset order with the second modal vibration shape of the second preset order to determine a second comparison result; and determine a target comparison result based on the first comparison result and the second comparison result.

[0130] Other embodiments or specific implementation methods of the knurled heat shield equivalent thickness conversion device of the present invention can refer to the above-mentioned method embodiments, which will not be repeated here.

[0131] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not limit this.

[0132] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.

[0133] In addition, for technical details not fully described in this embodiment, reference may be made to the method for converting the equivalent thickness of the knurled heat shield provided in any embodiment of the present invention, which will not be described in detail here.

[0134] In addition, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0135] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0136] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0137] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for calculating the equivalent thickness of a knurled heat shield, characterized in that: The knurled heat shield equivalent thickness conversion method includes: Obtaining a finite element model of a knurled aluminum plate of a first preset thickness; Performing modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate; Comparing the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of flat plate model aluminum plates of preset thickness to obtain a target comparison result; Determine the equivalent thickness of the flat plate model aluminum plate according to the target comparison result; Before obtaining the finite element model of the knurled aluminum plate with a first preset thickness, the method further includes: Obtain the initial thickness of the flat model aluminum plate; Performing a knurling process on the flat aluminum plate model with the initial thickness to obtain a knurled aluminum plate with a first preset thickness after knurling; The step of obtaining a finite element model of a knurled aluminum plate of a first preset thickness comprises: Call the preset meshing tool; Meshing the knurled aluminum plate of the first preset thickness according to the preset meshing tool to establish a finite element model of the knurled aluminum plate of the first preset thickness; Performing a knurling process on the flat plate model aluminum plate of the initial thickness to obtain a knurled aluminum plate of a first preset thickness after knurling, comprising: Get the average thinning rate of the knurling process; Performing a knurling process on the flat model aluminum plate of the initial thickness based on the average thinning rate to obtain a knurled aluminum plate of a first preset thickness after knurling; The method of obtaining the average thinning rate of the knurling process comprises: Obtaining the surface area of ​​the flat model aluminum plate corresponding to the preset knurled aluminum plate and the surface area of ​​the knurled aluminum plate determined by the preset modeling tool; The average thinning rate of the knurling process is determined according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate.

2. The method for calculating the equivalent thickness of a knurled heat shield according to claim 1, characterized in that: The calculation formula for determining the average thinning rate of the knurling process according to the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate is: ； Wherein, n represents the average thinning rate, represents the surface area of ​​the aluminum plate of the flat plate model, Indicates the surface area of ​​the knurled aluminum plate.

3. The method for calculating the equivalent thickness of a knurled heat shield according to any one of claims 1 to 2, characterized in that: Before comparing the first modal frequency and the first modal vibration shape with the second modal frequencies and the second modal vibration shapes of a plurality of flat plate model aluminum plates with preset thicknesses to obtain a target comparison result, the method further includes: Establishing a plurality of finite element models of flat aluminum plates with preset thicknesses by using the preset meshing tool; A modal analysis is performed on the finite element models of the plurality of flat aluminum plates with preset thicknesses according to a preset model analysis tool to obtain second modal frequencies and second modal vibration shapes of the plurality of flat aluminum plates with preset thicknesses.

4. The method for calculating equivalent thickness of a knurled heat shield according to any one of claims 1 to 2, characterized in that: The step of comparing the first modal frequency and the first modal vibration shape with the second modal frequencies and the second modal vibration shapes of a plurality of flat plate model aluminum plates with preset thicknesses to obtain a target comparison result includes: Comparing the first modal frequency of the first preset order with the second modal frequency of the first preset order to determine a first comparison result; Comparing the first mode vibration shape of the second preset order with the second mode vibration shape of the second preset order to determine a second comparison result; A target comparison result is determined according to the first comparison result and the second comparison result.

5. A knurled heat shield equivalent thickness conversion device, characterized in that: The knurled heat shield equivalent thickness conversion device comprises: A model building module, used for obtaining a finite element model of a knurled aluminum plate of a first preset thickness; A modal analysis module, used for performing modal analysis on the finite element model of the knurled aluminum plate to obtain a first modal frequency and a first modal vibration shape of the knurled aluminum plate; A modal comparison module, used for comparing the first modal frequency and the first modal vibration shape with the second modal frequency and the second modal vibration shape of a plurality of flat plate model aluminum plates of preset thickness to obtain a target comparison result; A thickness determination module, used to determine an equivalent thickness flat plate model aluminum plate according to the target comparison result; The model building module is also used to obtain the initial thickness of the flat model aluminum plate; The model building module is further used to perform a knurling process on the flat model aluminum plate of the initial thickness to obtain a knurled aluminum plate of a first preset thickness after knurling; The model building module is also used to obtain the finite element model of the knurled aluminum plate with a first preset thickness, including: The model building module is also used to call a preset meshing tool; The model building module is further used to mesh the knurled aluminum plate of the first preset thickness according to the preset meshing tool to establish a finite element model of the knurled aluminum plate of the first preset thickness; The model building module is also used to obtain the average thinning rate of the knurling process; The model building module is further used to perform a knurling process based on the average thinning rate according to the flat model aluminum plate of the initial thickness to obtain a knurled aluminum plate of a first preset thickness after knurling; The model building module is also used to obtain the surface area of ​​the flat model aluminum plate corresponding to the preset knurled aluminum plate and the surface area of ​​the knurled aluminum plate determined by the preset modeling tool; The model building module is also used to determine the average thinning rate of the knurling process based on the surface area of ​​the knurled aluminum plate and the surface area of ​​the flat model aluminum plate.

6. A knurled heat shield equivalent thickness conversion device, characterized in that: The knurled heat shield equivalent thickness conversion device comprises: a memory, a processor, and a knurled heat shield equivalent thickness conversion program stored in the memory and executable on the processor, wherein the knurled heat shield equivalent thickness conversion program is configured to implement the knurled heat shield equivalent thickness conversion method according to any one of claims 1 to 4.

7. A storage medium, characterized in that: The storage medium stores a knurled heat shield equivalent thickness conversion program, and when the knurled heat shield equivalent thickness conversion program is executed by the processor, the knurled heat shield equivalent thickness conversion method according to any one of claims 1 to 4 is implemented.

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