CN114398725A

CN114398725A - Method and device for calculating vehicle body matching adjustment quantity, computer equipment and storage medium

Info

Publication number: CN114398725A
Application number: CN202210162676.5A
Authority: CN
Inventors: 丁华; 邵俊; 于兴林; 张�杰; 冯波
Original assignee: Zhejiang Xitumeng Digital Technology Co ltd
Current assignee: Zhejiang Xitumeng Digital Technology Co ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-04-26

Abstract

The embodiment of the application belongs to the technical field of automobiles, and relates to a method and a device for calculating an automobile body matching adjustment quantity, computer equipment and a storage medium. The method and the device have the advantages that the adjustment quantity of the load boundary position is solved reversely according to the deviation adjustment demand quantity of the size appearance matching measuring points, then the adjustment quantity is converted into the geometric adjustment quantity of the part relative to the counter part, the matching optimization of the part is guided quickly, and meanwhile, the time for estimating the size adjustment quantity of the loaded position according to expert experience and solving trial and error repeatedly is saved.

Description

Method and device for calculating vehicle body matching adjustment quantity, computer equipment and storage medium

Technical Field

The present application relates to the field of automotive technologies, and in particular, to a method and an apparatus for calculating a vehicle body matching adjustment amount, a computer device, and a storage medium.

Background

With the continuous upward trend of autonomous automobile brands, the product development stage goes through several stages of structural design, modeling design and performance design, and currently, the product development stage enters a quality design stage. For the average consumer, a so-called high-end car is difficult to judge the quality level from a difficult professional process, and the feeling from the sense can be more attentive. The visual perception is particularly interesting as a typical first impression, which involves the quality of the fit between the parts, so that the dimensional deviations are an important research topic from the subjective point of view. On the other hand, according to the statistics of the JD Power of the third-party organization, more than half of the quality problems of the car products come from the over-size of the parts, so that this is also an important research topic for improving the quality of the whole car and establishing the market public praise objectively.

The manufacturing process of automobiles is complex, with supply chain lengths. From raw material control, parts processing, logistics, to finished vehicle assembly, dimensional errors are generated in each major step and are accumulated on the product. Therefore, in the product development stage, the finished vehicle tolerance design can carry out detailed tolerance definition on gaps and surface differences with matching requirements on appearance, and the gaps and the surface differences are distributed to each stage of assembly and single piece step by step, so that the requirements on the manufacturing process capacity are provided. Even so, the dimensions of people, machines, materials, methods and rings in the manufacturing process all contain sudden and non-random fluctuation which is difficult to predict in advance, the whole manufacturing cycle from trial production to mass production is caused, and a factory needs to perform the whole vehicle size matching activity based on the comprehensive checking fixture regularly, show the matching effect and analyze the matching quality so as to guide the die trimming and process control.

However, the applicant finds that the traditional comprehensive gauge has the obvious defects of long development, processing and construction time, high cost and low flexibility, and does not meet the overall requirement of the automobile market for continuously shortening the product development period.

Disclosure of Invention

The embodiment of the application aims to provide a method and a device for calculating the matching adjustment quantity of a vehicle body, computer equipment and a storage medium, so that the problems that the traditional comprehensive checking fixture is long in development, processing and construction time, high in cost, low in flexibility and not in line with the overall requirement of the automobile market for continuously shortening the product development period are solved.

In order to solve the above technical problem, an embodiment of the present application provides a method for calculating a vehicle body matching adjustment amount, which adopts the following technical scheme:

receiving part digital-analog information and material information input by a user terminal;

calling finite element preprocessing software and a solver to calculate stress deformation data corresponding to the part digital-analog information and the material information;

calling a Hyperview script, and calculating a transfer coefficient matrix according to the stressed deformation data, wherein the transfer coefficient matrix comprises a load position, an appearance matching measuring point and deformation data between the load position and the appearance matching measuring point;

receiving a measuring point adjusting section number, an appearance size matching position deviation adjusting demand, an adjusted appearance size matching precision standard and an adjusted quantity solving method which are input by the user terminal;

carrying out adjustment quantity solving operation according to the adjustment quantity solving method, the measuring point adjustment quantity section number, the transfer coefficient matrix, the appearance size matching position deviation adjustment demand and the adjusted appearance size matching precision standard to obtain a target adjustment quantity;

and outputting the target adjustment amount to the user terminal.

In order to solve the above technical problem, an embodiment of the present application further provides a device for calculating a vehicle body matching adjustment amount, which adopts the following technical scheme:

the information receiving unit is used for receiving part digital-analog information and material information input by a user terminal;

the finite element modeling unit is used for calling finite element preprocessing software and a solver to calculate stress deformation data corresponding to the part digital-analog information and the material information;

the transfer coefficient matrix extraction unit is used for calling a Hyperview script and calculating a transfer coefficient matrix according to the stressed deformation data, wherein the transfer coefficient matrix comprises a load position, an appearance matching measuring point and deformation data between the load position and the appearance matching measuring point;

the matching demand acquisition unit is used for receiving the measuring point adjusting section number, the appearance size matching position deviation adjusting demand, the adjusted appearance size matching precision standard and the adjusting quantity solving method which are input by the user terminal;

the adjustment quantity solving unit is used for carrying out adjustment quantity solving operation according to the adjustment quantity solving method, the measuring point adjustment quantity section number, the transmission coefficient matrix, the appearance size matching position deviation adjustment demand and the adjusted appearance size matching precision standard;

and the adjustment quantity output unit is used for outputting the target adjustment quantity to the user terminal.

In order to solve the above technical problem, an embodiment of the present application further provides a computer device, which adopts the following technical solutions:

the vehicle body matching adjustment quantity calculating method comprises a memory and a processor, wherein computer readable instructions are stored in the memory, and the processor realizes the steps of the vehicle body matching adjustment quantity calculating method when executing the computer readable instructions.

In order to solve the above technical problem, an embodiment of the present application further provides a computer-readable storage medium, which adopts the following technical solutions:

the computer readable storage medium stores computer readable instructions, and the computer readable instructions when executed by the processor implement the steps of the method for calculating the vehicle body matching adjustment amount as described above.

Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:

the application provides a method for calculating a vehicle body matching adjustment amount, which comprises the following steps: receiving part digital-analog information and material information input by a user terminal; calling finite element preprocessing software and a solver to calculate stress deformation data corresponding to the part digital-analog information and the material information; calling a Hyperview script, and calculating a transfer coefficient matrix according to the stressed deformation data, wherein the transfer coefficient matrix comprises a load position, an appearance matching measuring point and deformation data between the load position and the appearance matching measuring point; receiving a measuring point adjusting section number, an appearance size matching position deviation adjusting demand, an adjusted appearance size matching precision standard and an adjusted quantity solving method which are input by the user terminal; carrying out adjustment quantity solving operation according to the adjustment quantity solving method, the measuring point adjustment quantity section number, the transfer coefficient matrix, the appearance size matching position deviation adjustment demand and the adjusted appearance size matching precision standard to obtain a target adjustment quantity; and outputting the target adjustment amount to the user terminal. The method and the device have the advantages that the adjustment quantity of the load boundary position is solved reversely according to the deviation adjustment demand quantity of the size appearance matching measuring points, then the adjustment quantity is converted into the geometric adjustment quantity of the part relative to the counter part, the matching optimization of the part is guided quickly, meanwhile, the size adjustment quantity of the loaded position estimated according to expert experience is saved, and the trial and error time is solved repeatedly.

Drawings

In order to more clearly illustrate the solution of the present application, the drawings needed for describing the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.

FIG. 1 is an exemplary system architecture diagram in which the present application may be applied;

FIG. 2 is a flowchart illustrating an implementation of a method for calculating a vehicle body matching adjustment according to an embodiment of the present application;

FIG. 3 is a flowchart of one embodiment of step S202 in FIG. 2;

FIG. 4 is a schematic structural diagram of a specific implementation of a vehicle door sheet metal assembly according to an embodiment of the present application;

FIG. 5 is a diagram illustrating an embodiment of a transfer coefficient matrix according to an embodiment of the present application;

FIG. 6 is a flowchart of one embodiment of step S205 of FIG. 2;

FIG. 7 is a flowchart of one embodiment of step S406 in FIG. 6;

fig. 8 is a schematic structural diagram of a calculating device for vehicle body matching adjustment amount according to a second embodiment of the present application;

FIG. 9 is a schematic diagram of a structure of one embodiment of the finite element modeling unit 220 of FIG. 8;

FIG. 10 is a schematic block diagram of one embodiment of a computer device according to the present application.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

As shown in fig. 1, the system architecture 100 may include

terminal devices

101, 102, 103, a network 104, and a server 105. The network 104 serves as a medium for providing communication links between the

terminal devices

101, 102, 103 and the server 105. Network 104 may include various connection types, such as wired, wireless communication links, or fiber optic cables, to name a few.

The user may use the

terminal devices

101, 102, 103 to interact with the server 105 via the network 104 to receive or send messages or the like. The

terminal devices

101, 102, 103 may have various communication client applications installed thereon, such as a web browser application, a shopping application, a search application, an instant messaging tool, a mailbox client, social platform software, and the like.

The

terminal devices

101, 102, 103 may be various electronic devices having a display screen and supporting web browsing, including but not limited to smart phones, tablet computers, e-book readers, MP3 players (Moving Picture Experts Group Audio Layer III, mpeg compression standard Audio Layer 3), MP4 players (Moving Picture Experts Group Audio Layer IV, mpeg compression standard Audio Layer 4), laptop portable computers, desktop computers, and the like.

The server 105 may be a server providing various services, such as a background server providing support for pages displayed on the

terminal devices

101, 102, 103.

It should be noted that the method for calculating the vehicle body matching adjustment amount provided in the embodiment of the present application is generally executed by a server/terminal device, and accordingly, the calculating device for the vehicle body matching adjustment amount is generally disposed in the server/terminal device.

It should be understood that the number of terminal devices, networks, and servers in fig. 1 is merely illustrative. There may be any number of terminal devices, networks, and servers, as desired for implementation.

Example one

Continuing to refer to fig. 2, an implementation flowchart of a method for calculating a vehicle body matching adjustment amount according to a first embodiment of the present application is shown, and for convenience of explanation, only the portions related to the present application are shown.

The method for calculating the vehicle body matching adjustment amount comprises the following steps: step S201, step S202, step S203, step S204, step S205, and step S206.

In step S201, part digital-to-analog information and material information input by a user terminal are received.

In step S202, finite element preprocessing software and a solver are called to calculate stress deformation data corresponding to the part numerical model information and the material information.

In the embodiment of the application, the calculation of the stress deformation data can be realized by performing geometric cleaning operation and grid drawing operation on part digital-analog information according to finite element preprocessing software, and performing material setting operation and attribute setting operation according to material information to obtain a finite element model; receiving a constraint boundary condition corresponding to the part digital-analog information incidence relation and unit size deviation corresponding to the loaded position of the counter part, which are input by a user terminal; and carrying out deformation data solving operation on the constraint boundary conditions and the unit size deviation according to the finite element model and the solver to obtain stress deformation data.

In step S203, a hyperbiew script is called, and a transfer coefficient matrix is calculated according to the stressed deformation data, wherein the transfer coefficient matrix includes the load position, the appearance matching measuring point, and the deformation data between the load position and the appearance matching measuring point.

In step S204, the number of measuring point adjustment sections, the required amount of adjustment of the deviation of the external dimension matching position, the standard of the external dimension matching accuracy after adjustment, and the adjustment solving method, which are input by the user terminal, are received.

In the embodiment of the application, the matching position deviation adjustment demand (mm) input by a user, the adjusted matching precision standard (mm) specified by the user, and the adjustment quantity solving method (precision optimization method and adjustment quantity minimization method) are respectively collected.

In step S205, an adjustment quantity solving operation is performed according to an adjustment quantity solving method, the number of sections of the measurement point adjustment quantity, the transfer coefficient matrix, the deviation adjustment demand of the external dimension matching position, and the adjusted external dimension matching accuracy standard, so as to obtain a target adjustment quantity.

In the embodiments of the present application, the location of the part that is subject to hand piece loading is often different from the location of interest for appearance matching. Taking the car door as an example, the position of the counter-element sealing strip of the car door and the position of the matching gap of the car door are in different areas of the section of the car door.

In the embodiment of the application, under the ideal condition without dimensional deviation, after the door is closed, the sealing strip is compressed by the door to generate a compression counter force. Under the action of the load on the side part, the door generates theoretical deformation of 1-2 mm at the position of a gap matched with the side wall.

In the present embodiment, when there is a manufacturing or assembly dimensional deviation in the location of the subject hand piece load, the load may vary from the theoretical value, resulting in additional distortion of the appearance matching location. Still taking the vehicle door as an example, when there is a dimensional deviation in the installation gap of the sealing strip, the deformation of the vehicle door at the matching gap with the side wall exceeds the tolerance, the appearance perception quality is affected, and even serious quality defects such as wind noise, rain leakage, or too large closing force of the vehicle door are caused.

In the embodiment of the application, if the appearance matching positions of the parts have m focused appearance matching sections, the deformation vector of the section-focused parts after j node load is (sigma)_1j σ_2j…σ_mj) M is the number of appearance matching sections, σ_ij(i 1 … m) is a distortion at the i-section due to a unit deviation of the j-node (to the element load position) calculated by the finite element method, and therefore σ is the distortion at the i-section_ij(i-1 … m, j-1 … n) represents the transfer coefficient of the displacement of the i node to the j node.

In the embodiment of the application, when the load position of the hand piece is not deviated in a unit and the deviations of all the n load positions are linearly superposed, the total deformation amount of the section of interest at the periphery m of the part is an m-dimensional vector { C }_mAs shown in equation (1).

{C}_m＝[σ_ij]_m×n{X}_n (1)，

In the embodiment of the present application, { X }_nThe deviation vectors of all the opponent element load nodes. When the part is in a state of small deformation, i.e. X_j(j＝1 … n), the stress strain of the material is in a linear section, and the above equation (1) holds.

In the embodiment of the present application, when there is a problem in the matching of parts in reality, C_i(i-1 … m) are not necessarily all zeros, and equation (1) belongs to a non-uniform linear system of equations according to the definition of the linear system of equations. There are 3 cases of solutions to the system of equations: nonexistent, unique solution, infinite solution.

In the embodiment of the application, in consideration of the practical value of the solution on engineering, even if an infinite solution or a unique solution exists, if the solution is a group of vectors with huge difference of each dimension, such as a 3-dimensional vector (2, -2, 2), the engineering language is converted into the mode that the adjustment amount of the load node 1 is 2mm, the adjustment amount of the load node 2 is-2 mm, and the adjustment amount of the load node 3 is 2mm, the adjustment mode of the canine tooth staggering is not feasible neither in die repairing nor in tooling adjustment.

In the embodiment of the application, engineering limitations need to be further considered before solving the equation set, that is, the adjustment positions are as few as possible, the adjustment positions are continuously adjacent, the adjustment amounts at all positions are uniform and consistent, and the adjustment amounts are selected to be integer multiples of 0.1 mm. Therefore, n is limited to m, that is, the number of nodes at the adjusting position is equal to the number of sections matched with the appearance to be adjusted, and the adjusting position is selected at the sensitivity coefficient σ_ij(i 1 … m) is the largest continuous region, and let X₁＝X₂＝…＝X_n。

In the embodiment of the present application, considering that the actual appearance matching is qualified as long as the tolerance requirement is met, when the tolerance is ± T, the equation set (1) can be converted into:

{C}_m-T≤[σ_ij]_m×m{X}_m≤{C}_m+T (2)，

and the vector to be solved { X }_mSatisfy X₁＝X₂＝…＝X_m。

In conjunction with all of the additional conditions described above, the task has been transformed into an approximate solution to solve equation 1.

In step S206, the target adjustment amount is output to the user terminal.

In the embodiment of the application, a method for calculating the vehicle body matching adjustment amount is provided, and the method comprises the following steps: receiving part digital-analog information and material information input by a user terminal; calling finite element preprocessing software and a solver to calculate stress deformation data corresponding to the part digital-analog information and the material information; calling a Hyperview script, and calculating a transfer coefficient matrix according to the stressed deformation data, wherein the transfer coefficient matrix comprises a load position, an appearance matching measuring point and deformation data between the load position and the appearance matching measuring point; receiving a measuring point adjusting section number, an appearance size matching position deviation adjusting demand, an adjusted appearance size matching precision standard and an adjusting quantity solving method which are input by a user terminal; carrying out adjustment quantity solving operation according to an adjustment quantity solving method, the measuring point adjustment quantity section number, the transfer coefficient matrix, the appearance size matching position deviation adjustment demand and the adjusted appearance size matching precision standard to obtain a target adjustment quantity; and outputting the target adjustment amount to the user terminal. The method and the device have the advantages that the adjustment quantity of the load boundary position is solved reversely according to the deviation adjustment demand quantity of the size appearance matching measuring points, then the adjustment quantity is converted into the geometric adjustment quantity of the part relative to the counter part, the matching optimization of the part is guided quickly, meanwhile, the size adjustment quantity of the loaded position estimated according to expert experience is saved, and the trial and error time is solved repeatedly.

Continuing to refer to fig. 3, a flowchart of one embodiment of step S202 of fig. 2 is shown, and for ease of illustration, only the portions relevant to the present application are shown.

In some optional implementation manners of this embodiment, step S202 specifically includes: step S301, step S302, and step S303.

In step S301, geometric cleaning operation and mesh drawing operation are performed on the part digital-to-analog information according to the finite element preprocessing software, and material setting operation and attribute setting operation are performed according to the material information, so as to obtain a finite element model.

In step S302, a constraint boundary condition corresponding to the part digital-analog information correlation and a unit size deviation corresponding to the loaded position of the counter part, which are input by the user terminal, are received.

In step S303, a deformation data solving operation is performed on the constraint boundary condition and the unit size deviation according to the finite element model and the solver, so as to obtain stress deformation data.

In the embodiment of the application, a Hypermesh script based on TCL language is utilized to automatically carry out geometric cleaning, grid drawing and material and attribute setting, then constraint boundary conditions are set according to the installation relation of the parts, loads caused by unit size deviation are set at the loaded positions of the parts, and then a solver is called to solve the loads.

In the embodiment of the application, the size deformation of each appearance matching node at different load positions is derived according to the position information of the appearance matching measuring points by using a Hyperview script based on TCL language, and a transmission coefficient matrix table in an Excel format is formed.

In the embodiment of the application, the transfer coefficient matrix of the part can be quickly generated through the functions. Taking a vehicle door sheet metal assembly as an example (see fig. 4), the total time of finite element pretreatment, calculation solution and post-treatment is about 30 minutes. Since the compression load of the door weather strip is about 10N/100mm, the load can be equivalently converted into one load-receiving point per 100mm, and the load per point is 10N.

In the embodiment of the present application, the transmission coefficients of the 9 measurement points relative to the 38 load points are obtained by the aforementioned finite element post-processing method, and the transmission coefficient matrix shown in fig. 5 is obtained for use in the subsequent steps.

In some optional implementations of this embodiment, the finite element preprocessing software may be any one of Hypermesh, ANSYS, ANSA, or Patran.

In the embodiment of the application, the finite element preprocessing software is Hypermesh based on Altair corporation, and in principle, other commercial finite element preprocessing software, such as ANSYS, ANSA, Patran and the like, can be applied to develop similar scripts to realize the functions of finite element simulation and preprocessing.

Continuing to refer to fig. 6, a flowchart of one embodiment of step S205 of fig. 2 is shown, and for convenience of illustration, only the relevant portions of the present application are shown.

In some optional implementation manners of this embodiment, step S205 specifically includes: step S401, step S402, step S403, step S404, step S405, step S406, step S407, step S408, step S409, step S410, and step S411.

In step S401, the adjusted external dimension matching accuracy criterion is T, the boolean variable S is assigned false, and the target adjustment amount is X_tThe number of the measuring points adjusting section is m.

In step S402, a continuous m-th order sub-matrix corresponding to m is obtained from the transfer coefficient matrix, and the arithmetic sum of all elements is maximized, and the continuous m-th order sub-matrix is given to [ σ [ ]_ij]_m×m。

Step S403: for each target adjustment X_i(i 1 … m), calculation

And

wherein, C_i(i-1 … m) indicates the deformation value at the part appearance match, m.

Step S404: is X'_i(i-1 … 2m) and assigning a minimum value truncated rounded to X'_minAnd the carry value of the maximum value is rounded and assigned to X'_max。

Step S405: establishing an array Y with an array length of X'_max-X′_min+1。Y₁＝X′_min，Y₂＝X′_min+1, and so on until

Step S406: let X_temp＝Y₁And the calculation is circulated until

After each cycle X_tempIncrement by 1.

Step S407: when it occurs

If so, the value of the Boolean variable s is confirmed.

Step S408: if the value of the Boolean variable s is false, no solution is available, and the user is prompted to change the precision requirement after adjustment.

Step S409: if the value of the boolean variable s is true, the adjustment amount solving method is further confirmed.

Step S410: if the adjustment quantity solving method is the precision optimization method, the target adjustment quantity X_t＝Y_{minimax_nr}。

Step S411: if the adjustment quantity solving method is the adjustment quantity minimum method, the target adjustment quantity X_t＝Y_{mini_deform_nr}。

In the embodiment of the application, the matching effect calculated according to the precision optimization method is the best, but the adjustment amount is large. The matching effect obtained by the minimum adjustment method just meets the appearance tolerance standard specified by a user, the matching effect is slightly poor, but the adjustment amount is small, and the engineering realization is facilitated. Both have advantages and disadvantages, and can meet different application requirements.

Continuing to refer to fig. 7, a flowchart of one embodiment of step S406 of fig. 6 is shown, and for ease of illustration, only the portions relevant to the present application are shown.

In some optional implementation manners of this embodiment, step S406 specifically includes: step S501, step S502, step S503, step S504, step S505, step S506, step S507, and step S508.

In step S501, in each cycle calculation, the maximum deviation value D is first calculated_{max_dev}Assignment X_temp*(σ₁₁+σ₁₂+…+σ_1m)-C₁Then cyclically calculate D_temp＝X_temp*(σ_i1+σ_i2+…+σ_im)-C_i(i＝1…m)。

In step S502, D is calculated in each sub-loop_temp＝X_temp*(σ_i1+σ_i2+…+σ_im)-C_i(i-1 … m), judgment was made for D_tempIs greater than T.

In step S503, if D is reached_tempIs greater than T, the calculation is terminatedAnd proceeds to the next loop of step S406.

In step S504, if D is found_tempIs less than or equal to T, D is determined_tempWhether or not it is larger than the maximum deviation value D_{max_dev}。

In step S505, if D is found_tempGreater than the maximum deviation value D_{max_dev}Then D will be_{max_dev}Is updated to D_temp。

In step S506, if D does not appear in all the sub-loops_tempIs greater than T, D per cycle is determined_{max_dev}Comparing with the same variable of the previous cycle, if smaller, dynamically updating D_minimax＝D_{max_dev}And records the assignment of the loop number at this time to the variable minimax _ nr.

In step S507, X of each cycle is calculated_tempAnd comparing the absolute value with the same variable absolute value of the previous cycle, and if the absolute value is smaller, recording the assignment of the cycle number at the moment to the variable mini _ Deform _ nr.

In step S508, if the solution is successful and the boolean variable S is assigned to True, the next loop of step S406 is entered.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware associated with computer readable instructions, which can be stored in a computer readable storage medium, and when executed, can include processes of the embodiments of the methods described above. The storage medium may be a non-volatile storage medium such as a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a Random Access Memory (RAM).

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

Example two

With further reference to fig. 8, as an implementation of the method shown in fig. 2, the present application provides an embodiment of a device for calculating a vehicle body matching adjustment amount, where the embodiment of the device corresponds to the embodiment of the method shown in fig. 2, and the device can be applied to various electronic devices.

As shown in fig. 8, the vehicle body matching adjustment amount calculation device 200 of the present embodiment includes: the system comprises an information receiving unit 210, a finite element modeling unit 220, a transfer coefficient matrix extracting unit 230, a matching demand collecting unit 240, an adjustment quantity solving unit 250 and an adjustment quantity output unit 260. Wherein:

the information receiving unit 210 is configured to receive part digital-analog information and material information input by a user terminal.

And the finite element modeling unit 220 is used for calling finite element preprocessing software and a solver to calculate stress deformation data corresponding to the part digital-analog information and the material information.

And the transfer coefficient matrix extraction unit 230 is configured to invoke the Hyperview script, and calculate a transfer coefficient matrix according to the stressed deformation data, where the transfer coefficient matrix includes the load position, the appearance matching measurement point, and the deformation data between the load position and the appearance matching measurement point.

And the matching demand acquisition unit 240 is used for receiving the measuring point adjusting section number, the appearance size matching position deviation adjusting demand, the adjusted appearance size matching precision standard and the adjusting quantity solving method input by the user terminal.

And the adjustment quantity solving unit 250 performs adjustment quantity solving operation according to the adjustment quantity solving method, the measuring point adjustment quantity section number, the transmission coefficient matrix, the deviation adjustment demand quantity of the appearance size matching position and the adjusted appearance size matching precision standard to obtain the target adjustment quantity.

An adjustment amount output unit 260 for outputting the target adjustment amount to the user terminal.

In the embodiment of the application, if the part appearance is matched with the bitThe appearance matching sections with attention positioned at m are arranged in total, and the deformation vector of the pair of section opponents after the j node load is (sigma)_1j σ_2j…σ_mj) M is the number of appearance matching sections, σ_ij(i 1 … m) is a distortion at the i-section due to a unit deviation of the j-node (to the element load position) calculated by the finite element method, and therefore σ is the distortion at the i-section_ij(i-1 … m, j-1 … n) represents the transfer coefficient of the displacement of the i node to the j node.

{C}_m＝[σ_ij]_m×n{X}_n (1)，

In the embodiment of the present application, { X }_nThe deviation vectors of all the opponent element load nodes. When the part is in a state of small deformation, i.e. X_jWhen (j ═ 1 … n) is small, the stress-strain of the material is in a linear section, and the above equation (1) is always true.

In the embodiment of the present application, when there is a problem in the matching of parts in reality, C_i(i-1 … m) are not necessarily all zeros, and equation (1) belongs to a non-uniform linear system of equations according to the definition of the linear system of equations. There are 3 cases of solutions to the system of equations: absence, unique solution, infinite solution.

In the embodiment of the application, engineering limitations need to be further considered before solving the equation set, that is, the adjustment positions are as few as possible, the adjustment positions are continuously adjacent, the adjustment amounts at all positions are uniform and consistent, and the adjustment amounts are selected to be integer multiples of 0.1 mm. Therefore, n ═ m needs to be restricted, i.e.The number of nodes at the adjusting position is equal to the number of sections matched with the appearance to be adjusted, and the adjusting position is selected from the sensitivity coefficient sigma_ij(i 1 … m) is the largest continuous region, and let X₁＝X₂＝…＝X_n。

In the embodiment of the present application, considering that the actual appearance matching is qualified as long as the tolerance requirement is met, when the tolerance is ± T, the equation set (7) can be converted into:

{C}_m-T≤[σ_ij]_m×m{X}_m≤{C}_m+T (2)，

and the vector to be solved { X }_mSatisfy X₁＝X₂＝…＝X_m。

In an embodiment of the present application, there is provided a calculation apparatus 200 for a vehicle body matching adjustment amount, including: an information receiving unit 210, configured to receive part digital-analog information and material information input by a user terminal; the finite element modeling unit 220 is used for calling finite element preprocessing software and a solver to calculate stress deformation data corresponding to the part digital-analog information and the material information; the transfer coefficient matrix extraction unit 230 is configured to invoke a Hyperview script, and calculate a transfer coefficient matrix according to the stressed deformation data, where the transfer coefficient matrix includes a load position, an appearance matching measurement point, and deformation data between the load position and the appearance matching measurement point; the matching demand acquisition unit 240 is used for receiving the measuring point adjusting section number, the appearance size matching position deviation adjusting demand, the adjusted appearance size matching precision standard and the adjusting quantity solving method input by the user terminal; the adjustment quantity solving unit 250 is used for carrying out adjustment quantity solving operation according to an adjustment quantity solving method, the measuring point adjustment quantity section number, the transmission coefficient matrix, the deviation adjustment demand quantity of the appearance size matching position and the adjusted appearance size matching precision standard to obtain a target adjustment quantity; an adjustment amount output unit 260 for outputting the target adjustment amount to the user terminal. The method and the device have the advantages that the adjustment quantity of the load boundary position is solved reversely according to the deviation adjustment demand quantity of the size appearance matching measuring points, then the adjustment quantity is converted into the geometric adjustment quantity of the part relative to the counter part, the matching optimization of the part is guided quickly, meanwhile, the size adjustment quantity of the loaded position estimated according to expert experience is saved, and the trial and error time is solved repeatedly.

With continued reference to FIG. 9, a schematic diagram of one embodiment of the finite element modeling unit 220 of FIG. 8 is shown, with only portions relevant to the present application shown for ease of illustration.

In some optional implementations of the present embodiment, the finite element modeling unit 220 includes: a model construction subunit 221, a data acquisition subunit 222, and a deformation data solving subunit 223, wherein:

and the model construction subunit 221 is configured to perform geometric cleaning operation and grid drawing operation on the part digital-to-analog information according to the finite element preprocessing software, and perform material setting operation and attribute setting operation according to the material information to obtain a finite element model.

And the data acquisition subunit 222 is configured to receive a constraint boundary condition corresponding to the part digital-to-analog information association relationship and a unit size deviation corresponding to the loaded position of the counter part, which are input by the user terminal.

And the deformation data solving subunit 223 is configured to perform deformation data solving operation on the constraint boundary condition and the unit size deviation according to the finite element model and the solver to obtain the stressed deformation data.

In the embodiment of the application, Hypermesh script is utilized to automatically perform geometric cleaning, grid drawing, material and attribute setting, then constraint boundary conditions are set according to the part installation relation, loads caused by unit size deviation are set at the loaded positions of the parts, and then a solver is called to solve the loads.

In the embodiment of the application, the Hyperview script is utilized to derive the size deformation of each appearance matching node under different load positions according to the position information of the appearance matching measuring points, and a transmission coefficient matrix table in an Excel format is formed.

In the embodiment of the application, the finite element preprocessing software is Hypermesh of Altair corporation, and in principle, other commercial finite element preprocessing software, such as ANSYS, ANSA, Patran and the like, can be applied to develop similar scripts to realize the functions of finite element simulation and preprocessing.

In order to solve the technical problem, an embodiment of the present application further provides a computer device. Referring to fig. 10, fig. 10 is a block diagram of a basic structure of a computer device according to the present embodiment.

The computer device 300 includes a memory 310, a processor 320, and a network interface 330 communicatively coupled to each other via a system bus. It is noted that only computer device 300 having

components

310 and 330 is shown, but it is understood that not all of the shown components are required and that more or fewer components may alternatively be implemented. As will be understood by those skilled in the art, the computer device is a device capable of automatically performing numerical calculation and/or information processing according to a preset or stored instruction, and the hardware includes, but is not limited to, a microprocessor, an Application Specific Integrated Circuit (ASIC), a Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), an embedded device, and the like.

The computer device can be a desktop computer, a notebook, a palm computer, a cloud server and other computing devices. The computer equipment can carry out man-machine interaction with a user through a keyboard, a mouse, a remote controller, a touch panel or voice control equipment and the like.

The memory 310 includes at least one type of readable storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc. In some embodiments, the storage 310 may be an internal storage unit of the computer device 300, such as a hard disk or a memory of the computer device 300. In other embodiments, the memory 310 may also be an external storage device of the computer device 300, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, provided on the computer device 300. Of course, the memory 310 may also include both internal and external storage devices of the computer device 300. In this embodiment, the memory 310 is generally used for storing an operating system installed in the computer device 300 and various types of application software, such as computer readable instructions of a calculation method of a vehicle body matching adjustment amount. In addition, the memory 310 may also be used to temporarily store various types of data that have been output or are to be output.

The processor 320 may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor, or other data Processing chip in some embodiments. The processor 320 is generally operative to control overall operation of the computer device 300. In this embodiment, the processor 320 is configured to execute computer readable instructions stored in the memory 310 or computer readable instructions for processing data, such as a method for calculating the body matching adjustment amount.

The network interface 330 may include a wireless network interface or a wired network interface, and the network interface 330 is generally used to establish a communication connection between the computer device 300 and other electronic devices.

The computer equipment provided by the application innovatively solves the adjustment quantity of the load boundary position in a reverse mode according to the deviation adjustment demand quantity of the size appearance matching measuring points, then converts the adjustment quantity into the geometric adjustment quantity of the part relative to the counter part, guides the matching optimization of the part quickly, and meanwhile saves the time for estimating the size adjustment quantity of the loaded position according to expert experience and solving trial and error repeatedly.

The present application further provides another embodiment, which is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores computer-readable instructions, which can be executed by at least one processor, so as to cause the at least one processor to execute the steps of the method for calculating the body matching adjustment amount.

The computer-readable storage medium provided by the application is used for innovatively solving the adjustment quantity of the load boundary position in a reverse mode according to the deviation adjustment demand quantity of the size appearance matching measuring points, then converting the adjustment quantity into the geometric adjustment quantity of the part relative to the counter part, rapidly guiding the matching optimization of the part, and meanwhile saving the time for estimating the size adjustment quantity of the loaded position according to expert experience and repeatedly solving trial and error.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims

1. A method for calculating the matching adjustment amount of a vehicle body is characterized by comprising the following steps:

and outputting the target adjustment amount to the user terminal.

2. The method for calculating the vehicle body matching adjustment quantity according to claim 1, wherein the step of calling finite element preprocessing software and calculating stress deformation data corresponding to the part digital-analog information and the material information by a solver specifically comprises the following steps:

performing geometric cleaning operation and grid drawing operation on the part digital-analog information according to the finite element preprocessing software, and performing material setting operation and attribute setting operation according to the material information to obtain a finite element model;

receiving a constraint boundary condition corresponding to the part digital-analog information incidence relation and unit size deviation corresponding to the loaded position of the counter part, wherein the constraint boundary condition is input by the user terminal;

and carrying out deformation data solving operation on the constraint boundary conditions and the unit size deviation according to the finite element model and the solver to obtain the stress deformation data.

3. The method of calculating the body fit adjustment according to claim 1 or 2, wherein the finite element preprocessing software is any one of Hypermesh, ANSYS, ANSA, or Patran.

4. The method for calculating the vehicle body matching adjustment quantity according to claim 1, wherein the adjustment quantity solving method is an optimal precision method or a minimum adjustment quantity method, and the step of performing adjustment quantity solving operation according to the adjustment quantity solving method, the measured point adjustment quantity section number, the transmission coefficient matrix, the adjustment demand quantity of the external dimension matching position deviation and the adjusted external dimension matching precision standard to obtain the target adjustment quantity specifically comprises the following steps:

step S401: the matched precision standard of the adjusted appearance size is T, the Boolean type variable s is assigned as false, and the target adjustment quantity is X_tThe number of the measuring point adjusting sections is m;

step S402: obtaining continuous m-order sub-matrixes corresponding to m in the transfer coefficient matrix, maximizing the sum of the arithmetical numbers of all elements, and assigning the continuous m-order sub-matrixes to [ sigma ]_ij]_m×m；

Step S403: for each of the target adjustment amounts X_i(i 1.. m), calculating

And

wherein, the C_i(i 1.. m) represents the deformation value at the part appearance match, and m is total;

step S404: is X'_i(i 1.. 2m) and assigning a minimum value truncated rounded to X'_minAnd the carry value of the maximum value is rounded and assigned to X'_max；

Step S406: let X_temp＝Y₁And the calculation is circulated until

After each cycle X_temp1 is increased progressively;

step S407: when it occurs

If yes, confirming the value of the Boolean type variable s;

step S408: if the value of the Boolean variable s is false, no solution is available, and a user is prompted to change the precision requirement after adjustment;

step S409: if the value of the Boolean variable s is true, further confirming the adjustment quantity solving method;

step S410: if the adjustment solving method is a precision optimization method, the target adjustment X is obtained_t＝Y_{minimax_nr}；

Step S411:if the adjustment quantity solving method is an adjustment quantity minimum method, the target adjustment quantity X is_t＝Y_{mini_deform_nr}。

5. The method of calculating the vehicle body matching adjustment amount according to claim 4, wherein the step S406: let X_temp＝Y₁And the calculation is circulated until

After each cycle X_tempIncrement by 1, and specifically comprises the following steps:

in each cycle of calculation, the maximum deviation value D is first calculated_{max_dev}Assignment X_temp*(σ₁₁+σ₁₂+…+σ_1m)-C₁Then cyclically calculate D_temp＝X_temp*(σ_i1+σ_i2+…+σ_im)-C_i(i＝1...m)；

Calculating D in each sub-cycle_temp＝X_temp*(σ_i1+σ_i2+…+σ_im)-C_i(i 1.. m), D is judged_tempWhether the absolute value of (d) is greater than T;

if D is_tempIf the absolute value of (d) is greater than T, the calculation is terminated, and the next loop of step S406 is entered;

if D is_tempIs less than or equal to T, D is determined_tempWhether or not it is larger than the maximum deviation value D_{max_dev}；

If D is_tempIs greater than the maximum deviation value D_{max_dev}Then D will be_{max_dev}Is updated to D_temp；

If D does not appear in all the subcycles_tempIs greater than T, D per cycle is determined_{max_dev}Comparing with the same variable of the previous cycle, if smaller, dynamically updating D_minimax＝D_{max_dev}And recording the assignment of the cycle number at the moment to the variable minimax _ nr;

x of each cycle_tempThe absolute value is compared with the absolute value of the same variable in the previous cycle,if the value is smaller, recording the assignment of the cycle number at the moment to the variable mini _ Deform _ nr;

if the solution is successful, and the boolean variable S is assigned to True, the next loop of step S406 is entered.

6. A device for calculating a vehicle body matching adjustment amount is characterized by comprising:

the adjustment quantity solving unit is used for carrying out adjustment quantity solving operation according to the adjustment quantity solving method, the measuring point adjustment quantity section number, the transmission coefficient matrix, the appearance size matching position deviation adjustment demand quantity and the adjusted appearance size matching precision standard to obtain a target adjustment quantity;

7. The apparatus for calculating the amount of body matching adjustment according to claim 6, wherein the finite element modeling unit includes:

the model construction subunit is used for carrying out geometric cleaning operation and grid drawing operation on the part digital-analog information according to the finite element preprocessing software, and carrying out material setting operation and attribute setting operation according to the material information to obtain a finite element model;

the data acquisition subunit is used for receiving a constraint boundary condition corresponding to the part digital-analog information incidence relation and a unit size deviation corresponding to the loaded position of the counter part, which are input by the user terminal;

and the deformation data solving subunit is used for carrying out deformation data solving operation on the constraint boundary conditions and the unit size deviation according to the finite element model and the solver to obtain the stress deformation data.

8. The apparatus for calculating the vehicle body matching adjustment amount according to claim 6 or 7, wherein the finite element preprocessing software may be any one of Hypermesh, ANSYS, ANSA, or Patran.

9. A computer apparatus, characterized by comprising a memory and a processor, wherein the memory stores computer readable instructions, and the processor implements the steps of the method for calculating the vehicle body matching adjustment amount according to any one of claims 1 to 5 when executing the computer readable instructions.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon computer-readable instructions, which, when executed by a processor, implement the steps of the method for calculating the vehicle body matching adjustment amount according to any one of claims 1 to 5.