CN110826147A - Automobile seat design method, equipment and medium based on energy distribution control - Google Patents
Automobile seat design method, equipment and medium based on energy distribution control Download PDFInfo
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Abstract
The invention provides an automobile seat design method based on energy distribution control, which comprises the steps of establishing a seat impact finite element model, simulating energy distribution between a plurality of seat parts in a preset seat model and a dummy model under the vehicle collision working condition to obtain a seat energy data set, and extracting the total seat energy value and all seat part energy values in the seat energy data set; judging whether the total seat energy value and the seat part energy value meet a preset energy distribution table, judging whether a seat part in a seat model fails, calculating the value of energy borne by each seat part when the seat is collided, effectively evaluating the influence of the impact response of the whole seat framework according to the energy borne by each seat part, and judging whether each seat part needs to be improved. According to the automobile seat design method based on energy distribution control, the improvement range of the seat is reduced, the development cycle of the seat is shortened to a certain extent, and the product competitiveness is improved.
Description
Technical Field
The invention relates to the field of automobile seat design, in particular to an automobile seat design method, equipment and medium based on energy distribution control.
Background
The automobile seat is an important automobile part, can effectively protect the personal safety of passengers when an automobile collides, and reduces the injury to the passengers in the collision process. With the continuous development and evolution of automobile technology, intellectualization and light weight become the important trend of automobile technology development in recent years, and as important parts of automobiles, because automobile seats are complex in structure and relate to various factors such as safety, environmental protection and NVH (noise, vibration and harshness), the development cycle of the automobile seats is long, and more test items are involved, and a relatively long time is occupied only through test verification. In traditional car seat design process, regard as a whole with the seat skeleton, can not effectively assess the influence of single part to the whole skeleton shock response of seat, and then carry out local enhancement after experimental trouble appearing, can lead to the inefficacy risk increase of other parts and can not effectively control the inefficacy risk of the single part of whole skeleton, still can lead to the design cycle of whole car seat longer.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide an automobile seat design method based on energy distribution control, which can solve the problems that in the traditional automobile seat design process, the impact response of a single component on the whole seat framework cannot be effectively evaluated by considering the seat framework as a whole, and further, when a test has a problem, local reinforcement is performed, which may increase the failure risk of other components and cannot effectively control the failure risk of the single component of the whole seat framework, and also may result in a longer design cycle of the whole automobile seat.
The second purpose of the present invention is to provide an electronic device, which can solve the problems that in the conventional automobile seat design process, the impact response of a single component on the whole seat framework cannot be effectively evaluated by considering the seat framework as a whole, and further, when a test has a problem, the local reinforcement is performed, which may increase the failure risk of other components, and may not effectively control the failure risk of the single component of the whole framework, and may also result in a longer design cycle of the whole automobile seat.
The invention also aims to provide a computer readable storage medium, which can solve the problems that in the traditional automobile seat design process, the influence of a single component on the impact response of the whole seat framework cannot be effectively evaluated by considering the seat framework as a whole, and further, when a test has a problem, the failure risk of other components is increased and the failure risk of the single component of the whole framework cannot be effectively controlled by carrying out local reinforcement, and the design period of the whole automobile seat is longer.
One of the purposes provided by the invention is realized by adopting the following technical scheme:
a design method of an automobile seat based on energy distribution control comprises the following steps:
s1, sequentially carrying out division processing, material attribute endowing processing, dummy model leading-in processing, constraint processing and attribute configuration processing on a preset seat model to obtain a seat impact finite element model containing the seat model and the dummy model, wherein the seat model comprises a plurality of seat parts;
s2, loading a preset acceleration curve to the seat impact finite element model, calculating the energy of the finite element model added to the preset acceleration curve by using a preset finite element solver, and simulating the energy distribution between a plurality of seat components and a dummy model in the preset seat model under the vehicle collision working condition to obtain a seat energy data set, wherein the seat energy data set comprises a total seat energy value and a seat component energy value;
s3, extracting the total seat energy value and all seat component energy values in the seat energy data set;
s4, judging whether the total seat energy value and the seat component energy value meet a preset energy distribution table, if so, executing a step S6, otherwise, generating data which do not meet seat components, and executing a step S5;
s5, improving the corresponding seat component in the seat model according to the unsatisfied seat component data, using the improved seat model as the preset seat model again, and continuing to execute the step S1;
and S6, judging whether the seat component in the seat model fails, if so, improving the failed seat component, taking the improved seat model as the preset seat model again and returning to execute the step S1, and if not, taking the seat model as a qualified seat model.
Further, the step S1 is specifically:
dividing, namely performing assembly division on a preset seat model to obtain an assembly file, and performing meshing division on the assembly file to obtain a seat finite element base model;
material attribute endowing treatment, namely setting boundary conditions of the seat finite element basic model, endowing preset material attributes to different seat parts in the seat finite element basic model, and establishing contact pairs among different seat parts in the seat finite element basic model;
importing a dummy model, and placing the finite element dummy model on the finite element basic model of the seat according to preset position data;
constraint processing, namely establishing a constraint system of a finite element dummy model and a seat finite element basic model according to preset coordinate data;
and (3) attribute configuration processing, namely setting an impact curve, a model control card and model data output for a finite element dummy model and a seat finite element basic model forming a constraint system to obtain a seat impact finite element model containing a seat model and a dummy model.
Further, the preset position data includes, but is not limited to, coordinates of H point, angle of backrest, coordinates of foot root point, rotation angle of head and each joint.
Further, the restraint system comprises a vehicle body floor, a lower safety belt fixing point, an upper safety belt fixing point, a retractor and a safety belt.
Further, before the step S4, a preset energy distribution table is set, a plurality of different target energy proportion ranges and a plurality of seat component names are set, the seat component names and the target energy proportion ranges are associated with each other according to preset association attributes, and each seat component name corresponds to a unique target energy proportion range.
Further, the step of judging whether the total seat energy value and the seat component energy value satisfy a preset energy distribution table specifically includes: and calculating a seat component energy ratio according to the seat component energy value and the seat total energy value, and judging whether the seat component energy ratio meets a corresponding target energy ratio range in an energy distribution table.
Further, the seat components include, but are not limited to, an upper backrest beam, a lower backrest beam, a seat cushion side plate, a seat cushion connecting plate, an angle adjuster, and a slide rail, the energy values of the seat components include an upper backrest beam energy value, a lower backrest beam energy value, a seat cushion side plate energy value, a seat cushion connecting plate energy value, an angle adjuster energy value, and a slide rail energy value, and the names of the seat components include an upper backrest beam, a lower backrest beam, a seat cushion side plate, a seat cushion connecting plate, an angle adjuster, and a slide rail.
Further, the judging whether the seat component in the seat model fails specifically includes: and judging whether the seat part in the seat model is torn or damaged in the impact process.
The second purpose of the invention is realized by adopting the following technical scheme:
an electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing an energy distribution control-based automotive seat design method of the present application.
The third purpose of the invention is realized by adopting the following technical scheme:
a computer-readable storage medium having stored thereon a computer program for execution by a processor of a method of energy distribution control based vehicle seat design according to the present application.
Compared with the prior art, the invention has the beneficial effects that: the method for designing the automobile seat based on the energy distribution control comprises the steps of establishing a seat impact finite element model, simulating energy distribution between a plurality of seat parts in the seat model and a dummy model under the vehicle collision working condition to obtain a seat energy data set, and extracting the total seat energy value and all seat part energy values in the seat energy data set; whether the total energy value of the seat and the energy value of the seat part meet a preset energy distribution table or not is judged, whether the seat part in the seat model fails or not is judged, when the seat is collided, the value of energy borne by each seat part is calculated, the influence of impact response of the whole framework of the seat is effectively evaluated according to the energy borne by each seat part, whether each seat part needs to be improved or not is judged, single or specific seat parts are improved in design to meet the design requirement, the design improvement direction can be guided to a certain extent, the improvement range of the seat is reduced, the development period of the seat is shortened to a certain extent, and the product competitiveness is improved.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
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The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a method for designing an automobile seat based on energy distribution control according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the present invention, the embodiments or technical features described below may be arbitrarily combined to form a new embodiment without conflict.
As shown in fig. 1, the invention relates to a method for designing an automobile seat based on energy distribution control, which comprises the following steps:
s1, establishing a finite element model, and sequentially carrying out division processing, material attribute assignment processing, dummy model introduction processing, constraint processing and attribute configuration processing on a preset seat model to obtain a seat impact finite element model containing the seat model and the dummy model, wherein the seat model comprises a plurality of seat parts. The method specifically comprises the following steps:
the method comprises the steps of dividing, performing assembly division on a preset seat model through a seat model preset by CATIA software (a three-dimensional drawing tool), dividing the preset seat model into a seat model assembly, a seat foaming assembly and a plastic part assembly respectively to obtain an assembly file, importing the assembly file into finite element software Hypermesh (the Hypermesh software is a product of Altair corporation in America, is a CAE application software package with advanced world and strong functions and is also an innovative and open enterprise-level CAE platform) to perform grid division, dividing a sheet metal part of the seat model into shell unit type grids, dividing the seat foaming and the plastic part into entity unit types to obtain a seat finite element basic model, and ensuring the feasibility of the seat finite element basic model through methods such as grid quality inspection, grid unit interference adjustment, grid normal adjustment and the like.
And (2) material attribute endowing treatment, namely setting boundary conditions of the seat finite element basic model, importing the seat finite element basic model into Oasys Primer software for calculation and setting the boundary conditions, wherein the setting of the boundary conditions comprises but is not limited to the establishment of simulation bolts and simulation welding, endowing preset material attributes to different seat parts, and establishing contact pairs among parts of the seat model to ensure that the seat finite element model is as close as possible to an actual physical model.
Importing a dummy model, and placing the finite element dummy model on the finite element basic model of the seat according to preset position data; and (3) introducing a finite element dummy model through an Included function in the Oasys Primer software, and placing the finite element dummy model on the established seat finite element basic model by adjusting the H point coordinate, the backrest angle, the foot root point coordinate and the rotation angles of the head and each joint of the finite element dummy model.
Constraint processing, namely establishing a constraint system of a finite element dummy model and a seat finite element basic model according to preset coordinate data; the restraint system mainly comprises a vehicle body floor, a lower fixing point of the safety belt, a retractor and the safety belt, and is used for ensuring that the safety belt successfully restrains the dummy on the seat in the impact process.
And (3) attribute configuration processing, namely setting an impact curve, a model control card and model data output for a finite element dummy model and a seat finite element basic model forming a constraint system to obtain a seat impact finite element model containing the seat model and the dummy model, and exporting the established seat impact finite element model into a key form file.
S2, cae (computer Aided engineering) refers to computer Aided engineering) analysis, a preset acceleration curve is loaded on the seat impact finite element model, the energy of the finite element model added to the preset acceleration curve is calculated by using a preset finite element solver, the preset finite element solver used in this embodiment is LS-Dyna, which is a complete-function program of geometric nonlinearity (large displacement, large rotation and large strain), material nonlinearity (more than 140 material dynamic models) and contact nonlinearity (more than 50), the energy of the finite element model added to the preset acceleration curve is calculated by selecting the type of the finite element solver, setting the NCPU kernel number and setting the memoy, the energy distribution between a plurality of seat components and a dummy model in the preset seat model under the vehicle collision condition is simulated, obtaining a seat energy data set, wherein the seat energy data set comprises a seat total energy value and a seat component energy value;
and S3, extracting energy values of all the seat parts, and extracting total seat energy values and all the seat part energy values in the seat energy data set.
And S4, judging whether the energy value meets a preset energy distribution table or not, judging whether the total seat energy value and the seat component energy value meet the preset energy distribution table or not, if so, executing a step S6, otherwise, generating data which do not meet the seat component, and executing a step S5. In this example, before S4, the method further includes setting a preset energy distribution table, setting a plurality of different target energy ratio ranges and a plurality of seat component names, and associating the seat component names with the target energy ratio ranges according to preset association attributes, wherein each seat component name corresponds to a unique target energy ratio range. Judging whether the total seat energy value and the seat component energy value meet the preset energy distribution table specifically comprises the following steps: and calculating the seat component energy ratio according to the seat component energy value and the seat total energy value, and judging whether the seat component energy ratio meets the corresponding target energy ratio range in the energy distribution table. In this embodiment, the seat components include, but are not limited to, an upper backrest cross beam, a lower backrest cross beam, a seat cushion side plate, a seat cushion connecting plate, an angle adjuster, and a slide rail, the energy values of the seat components include an upper backrest cross beam energy value, a lower backrest cross beam energy value, a seat cushion side plate energy value, a seat cushion connecting plate energy value, an angle adjuster energy value, and a slide rail energy value, and the names of the seat components include an upper backrest cross beam, a lower backrest cross beam, a seat cushion side plate, a seat cushion connecting plate, an angle adjuster, and a slide rail. For example, the following table 1 is a preset energy distribution table obtained by filling the seat component energy value and the seat total energy value into the preset energy distribution table;
table 1: presetting energy distribution table after filling energy value
As shown in table 1, the energy values of the upper backrest cross beam, the lower backrest cross beam, the side seat plate, the connecting seat plate, the angle adjuster and the slide rail are respectively numbered (i.e. represented by P1-P7) and filled into a preset energy distribution table, and according to table 1, the energy ratios of the seat components include an energy ratio of the upper backrest cross beam, an energy ratio of the lower backrest cross beam, an energy ratio of the side seat plate, an energy ratio of the connecting seat plate, an energy ratio of the angle adjuster and an energy ratio of the slide rail, and the energy ratios of the seat components are correspondingly numbered as C1-C7; the target energy ratio ranges include a target energy ratio range of an upper backrest crossbeam, a target energy ratio range of a lower backrest crossbeam, a target energy ratio range of a side plate of a seat cushion, a target energy ratio range of a connecting plate of the seat cushion, a target energy ratio range of an angle adjuster and a target energy ratio range of a slide rail (corresponding to numbers D1-D7), whether C1-C7 are respectively in the ranges D1-D7 is judged, and the total seat energy in the table 1 is represented by B. The above numerical values are for illustrative purposes only and are not actually referred to. In this embodiment, when the preset energy distribution table is not satisfied, unsatisfied seat part data is generated, where the unsatisfied seat part data includes that the seat name and the unsatisfied factor are not satisfied, the unsatisfied factor is lower than a target value or exceeds the target value, and the energy proportion value lower than the target value is that the energy proportion value corresponding to a certain seat part is lower than the corresponding target energy proportion range; an energy fraction value above the target value, i.e. for a certain seat part, is higher than the corresponding target energy fraction range.
S5, improving the corresponding seat part in the seat model according to the data of the unsatisfied seat part, and when the unsatisfied factor is lower than a target value, showing that the energy absorption effect of the seat part is poor, and increasing the energy absorption effect by improving the structure of the seat part; when the unsatisfied factor is higher than the target value, the energy absorption effect of the seat component is over good, and the energy absorption effect can be reduced by improving the structure of the seat component; the improved seat model is re-used as the preset seat model, and the process continues to step S1.
S6, judging whether the seat part in the seat model fails, judging whether the seat part in the seat model has a tearing or damage risk in the impact process, if so, improving the failed seat part, using the improved seat model as the preset seat model again and returning to execute the step S1, and if not, using the seat model as the qualified seat model.
The method for designing the automobile seat based on the energy distribution control comprises the steps of establishing a seat impact finite element model, simulating energy distribution between a plurality of seat parts and a dummy model in a preset seat model under the vehicle collision working condition to obtain a seat energy data set, and extracting the total seat energy value and all seat part energy values in the seat energy data set; judging whether the total seat energy value and the seat component energy value meet a preset energy distribution table, judging whether a seat component in a seat model fails, calculating the value of energy borne by each seat component when the seat is collided, effectively evaluating the influence of the impact response of the whole seat framework according to the energy borne by each seat component, and judging whether each seat component needs to be improved. The beneficial effects are that: 1. by setting the energy distribution meter of each part of the seat system under each collision working condition, the proportion value of the energy of each part of the seat in the total energy of the seat system in the meter can ensure that the energy of each part of the seat changes uniformly and stably while the performance of the seat system meets the design target, and the energy distribution meter has higher engineering application value. 2. And in the stage of designing the seat component structure, guiding the improvement direction of the seat component structure design by comparing whether the energy distribution of each component of the seat meets a target value. 3. The design requirements are met by carrying out design change on a single seat component or a plurality of seat components with definite targets, the design improvement direction can be guided to a certain extent, the seat improvement range is reduced, the seat development period is shortened, and the product competitiveness is improved. 4. After each part of the seat meets the energy distribution requirement, the failure risk of each part is judged, the part is further definitely improved, and after the part is improved to be free of the failure risk, the design data can be determined. 5. The method can effectively determine the seat design data and improve the target, can effectively improve the working efficiency of seat design development, and has higher engineering application value.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any equivalent changes, modifications, evolutions, etc. made to the above embodiments according to the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A design method of an automobile seat based on energy distribution control is characterized by comprising the following steps:
s1, sequentially carrying out division processing, material attribute endowing processing, dummy model leading-in processing, constraint processing and attribute configuration processing on a preset seat model to obtain a seat impact finite element model containing the seat model and the dummy model, wherein the seat model comprises a plurality of seat parts;
s2, loading a preset acceleration curve to the seat impact finite element model, calculating the energy of the finite element model added to the preset acceleration curve by using a preset finite element solver, and simulating the energy distribution between a plurality of seat components and a dummy model in the preset seat model under the vehicle collision working condition to obtain a seat energy data set, wherein the seat energy data set comprises a total seat energy value and a seat component energy value;
s3, extracting the total seat energy value and all seat component energy values in the seat energy data set;
s4, judging whether the total seat energy value and the seat component energy value meet a preset energy distribution table, if so, executing a step S6, otherwise, generating data which do not meet seat components, and executing a step S5;
s5, improving the corresponding seat component in the seat model according to the unsatisfied seat component data, using the improved seat model as the preset seat model again, and continuing to execute the step S1;
and S6, judging whether the seat component in the seat model is invalid, if so, improving the invalid seat component, taking the improved seat model as the preset seat model again and returning to execute the step S1, and if not, taking the seat model as a qualified seat model.
2. The method of claim 1, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: the step S1 specifically includes:
dividing, namely performing assembly division on a preset seat model to obtain an assembly file, and performing meshing division on the assembly file to obtain a seat finite element base model;
material attribute endowing treatment, namely setting boundary conditions of the seat finite element basic model, endowing preset material attributes to different seat components in the seat finite element basic model, and establishing contact pairs among different seat components in the seat finite element basic model;
carrying out importing processing on the dummy model, and placing the finite element dummy model on the seat finite element basic model according to preset position data;
constraint processing, namely establishing a constraint system of a finite element dummy model and a seat finite element basic model according to preset coordinate data;
and (3) attribute configuration processing, namely setting an impact curve, a model control card and model data output for a finite element dummy model and a seat finite element basic model forming a constraint system to obtain a seat impact finite element model containing a seat model and a dummy model.
3. The method of claim 2, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: the preset position data includes, but is not limited to, coordinates of an H point, a backrest angle, coordinates of a foot root point, rotation angles of the head and each joint.
4. The method of claim 2, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: the restraint system comprises a vehicle body floor, a lower fixing point of the safety belt, a upper fixing point of the safety belt, a retractor and the safety belt.
5. The method of claim 1, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: before S4, a preset energy distribution table is set, a plurality of different target energy proportion ranges and a plurality of seat component names are set, the seat component names and the target energy proportion ranges are associated with each other according to preset association attributes, and each seat component name corresponds to a unique target energy proportion range.
6. The method of claim 5, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: the step of judging whether the total seat energy value and the seat component energy value meet a preset energy distribution table specifically comprises the following steps: and calculating a seat component energy ratio according to the seat component energy value and the seat total energy value, and judging whether the seat component energy ratio meets a corresponding target energy ratio range in an energy distribution table.
7. The method of claim 6, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: the seat component comprises but not limited to an upper backrest crossbeam, a lower backrest crossbeam, a seat cushion side plate, a seat cushion connecting plate, an angle adjuster and a slide rail, the energy value of the seat component comprises an upper backrest crossbeam energy value, a lower backrest crossbeam energy value, a seat cushion side plate energy value, a seat cushion connecting plate energy value, an angle adjuster energy value and a slide rail energy value, and the name of the seat component comprises an upper backrest crossbeam, a lower backrest crossbeam, a seat cushion side plate, a seat cushion connecting plate, an angle adjuster and a slide rail.
8. The method of claim 1, wherein the step of designing the vehicle seat based on the energy distribution control comprises the steps of: the specific steps for judging whether the seat part in the seat model fails are as follows: and judging whether the seat part in the seat model has tearing or damage risk in the impact process.
9. An electronic device, characterized by comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for carrying out the method of any one of claims 1-8.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor for performing the method according to any of claims 1-8.
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