CN110955930B - Mining engineering vehicle lightweight model acquisition method and device - Google Patents
Mining engineering vehicle lightweight model acquisition method and device Download PDFInfo
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Abstract
The invention discloses a method and a device for acquiring a lightweight model of an engineering vehicle, wherein the method comprises the following steps: constructing a first vehicle model of the mining dump truck by adopting first simulation software; dividing the first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; converting the first sub-model into a third sub-model of the solid model by adopting second simulation software, and converting the second sub-model into a fourth sub-model with variable thickness parameters to obtain a second vehicle model; adopting third simulation software to conduct first-standard finite element mesh division on the third sub-model, and conducting second-standard finite element mesh division on the fourth sub-model to obtain a third vehicle model; and setting boundary conditions for the third vehicle model in the third simulation software, and performing thickness reduction simulation to obtain the lightweight vehicle model. The invention can obtain the high-quality and high-precision light-weight mining dump truck model under the condition of reducing the calculation difficulty.
Description
Technical Field
The invention relates to the technical field of engineering vehicle development, in particular to a method and a device for acquiring a light model of a mining engineering vehicle.
Background
Along with the increasingly strict requirements of China on energy conservation and environmental protection and the demands of national energy development strategy, the automobile weight reduction becomes an important means for relieving energy pressure, improving environment and reducing haze. Particularly, the large engineering vehicles have large energy consumption and high emission, and the light-weight design of the engineering vehicles can effectively reduce the energy consumption and the emission under the condition of ensuring the working requirements, thereby playing the roles of protecting the environment and saving the cost. However, at present, there are two general problems in designing a lightweight model of a vehicle: firstly, when more three-dimensional dimensions of parts are needed by the model, the difference is larger, various interference and gap problems are easy to occur in assembly after three-dimensional modeling of each part, and the precision can not meet the requirements. Secondly, after the model is subjected to grid division, the number of grids is large, the consumption of computing resources is large, and the required time is long. For example, for a mining dump truck, parts are more, three-dimensional size differences of certain parts are quite large, meanwhile, the working environment is quite complex, and each part is not only stressed but also acted on with complex force. The precision and the strength of each part of the mining dump truck are very high.
Therefore, it is still difficult to obtain a high-quality and high-precision light-weight mining dump truck model under the condition of reducing the calculation difficulty at present.
Disclosure of Invention
In view of the above problems, the application provides a method and a device for acquiring a lightweight model of an engineering vehicle, which can obtain a lightweight mining dump truck model with high quality and high precision under the condition of reducing calculation difficulty, and are used for guiding production design.
In a first aspect, the present application provides, by way of an embodiment, the following technical solutions:
an engineering vehicle lightweight model acquisition method, the method comprising:
constructing a first vehicle model of the mining dump truck by adopting first simulation software; dividing a first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model; converting the first sub-model into a third sub-model of the solid model by adopting second simulation software, and converting the second sub-model into a fourth sub-model with variable thickness parameters to obtain a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model; performing first-standard finite element mesh division on the third sub-model by adopting third simulation software, and performing second-standard finite element mesh division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion; and setting a boundary condition for the third vehicle model in the third simulation software, and performing thickness reduction simulation under the boundary condition to obtain a lightweight vehicle model.
Preferably, the second simulation software is Spaceclaim, and the third simulation software is workbench.
Preferably, the splitting the first vehicle model into a first sub-model and a second sub-model according to the load-bearing structural characteristics of each model component in the first vehicle model includes:
distributing entity units to model components with larger influence on the bearing capacity in the first vehicle model; assigning a shell element to a model component having less influence on the load carrying capacity in the first vehicle model; the first sub-model and the second sub-model are obtained from the entity units and the shell units assigned to the model components of the first vehicle model.
Preferably, the converting the first sub-model into a third sub-model and the second sub-model into a fourth sub-model in the second simulation software to obtain a second vehicle model includes:
carrying out thickness lifting on the curved surface three-dimensional model of the first sub-model to obtain a third sub-model; grouping model components in the second sub-model based on thickness to obtain a component group; wherein the model components with the same thickness in the component group are a group; setting variable thickness parameters for each group of model components in the component group to obtain a fourth sub-model; and obtaining a second vehicle model according to the third sub-model and the fourth sub-model.
Preferably, the thickness reduction simulation under the boundary condition is performed to obtain a lightweight vehicle model, including:
performing simulation analysis on stress and displacement of the third vehicle model to obtain a simulation result; judging whether the simulation result accords with the boundary condition; if yes, reducing the thickness of the third sub-model in the second simulation software to obtain a first thickness; and/or reducing the thickness of the fourth sub-model in the second simulation software to obtain a second thickness; transmitting the first thickness and the second thickness to the third simulation software for model construction to obtain a fourth vehicle model for continuous simulation analysis; if the simulation result corresponding to the fourth vehicle model meets the boundary condition, continuing to reduce the thickness of the third sub-model and the thickness of the fourth sub-model; and obtaining the lightweight vehicle model until the fourth vehicle model meets the boundary condition and the thickness of the third sub model and the thickness of the fourth sub model are minimum.
Preferably, the boundary condition includes: maximum stress conditions and maximum displacement conditions; the maximum stress condition indicates that the maximum stress in the lightweight vehicle model is smaller than or equal to a preset stress value, and the maximum displacement condition indicates that the maximum deformation displacement in the lightweight vehicle model is smaller than or equal to a preset displacement.
According to the second aspect, based on the same inventive concept, the present application provides, through an embodiment, the following technical solutions:
an engineering vehicle lightweight model acquisition device, the device comprising:
the model construction module is used for constructing a first vehicle model of the mining dump truck by adopting first simulation software; the model splitting module is used for splitting the first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model; the model conversion module is used for converting the first sub model into a third sub model of the solid model in second simulation software, converting the second sub model into a fourth sub model with variable thickness parameters, and obtaining a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model; the grid division module is used for carrying out first-standard finite element grid division on the third sub-model by adopting third simulation software, and carrying out second-standard finite element grid division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion; and the thickness adjustment module is used for setting boundary conditions for the third vehicle model in the third simulation software and performing thickness reduction simulation under the boundary conditions to obtain a lightweight vehicle model.
Preferably, the second simulation software is Spaceclaim, and the third simulation software is workbench.
Preferably, the model splitting module is further configured to:
distributing entity units to model components with larger influence on the bearing capacity in the first vehicle model; assigning a shell element to a model component having less influence on the load carrying capacity in the first vehicle model; the first sub-model and the second sub-model are obtained from the entity units and the shell units assigned to the model components of the first vehicle model.
In a third aspect, based on the same inventive concept, the present application provides, by an embodiment, the following technical solutions:
a computer readable storage medium having stored thereon a computer program which when executed by a processor realizes the steps of the method according to any of the first aspects.
According to the engineering vehicle lightweight model acquisition method, the first vehicle model of the constructed mining dump truck is split, and the split is performed based on the characteristics of the bearing structure, so that the influence of different model components in the first vehicle model on the whole truck can be effectively distinguished. And then, performing model conversion on the first sub-model and the second sub-model which are obtained after the disassembly to obtain a third sub-model which is a solid model and a fourth sub-model with variable thickness parameters. After model conversion, the finite element meshing of the model components with different influence sizes can be divided, namely finer finite element meshing is performed on the structural part with larger influence on the bearing capacity, rough finite element meshing is performed on the structural part with smaller influence on the bearing capacity, and therefore the accurate and reliable parameters of important components can be ensured during simulation analysis. The relatively coarse finite element mesh is divided among relatively less important components, whereas the less important components are typically cabin boards or the like, and even the relatively coarse finite element mesh can ensure higher calculation accuracy while saving calculation time. In the embodiment of the application, the first vehicle model is split, so that model parameter deletion caused by simultaneous transmission of model parameters of different model components can be avoided, and the accuracy of subsequent model establishment is further improved. Finally, by adjusting the model thicknesses of the third sub-model and the fourth sub-model respectively, the problem that the splicing part is lost easily after the middle surface is extracted in the finite element model process can be avoided, and meanwhile, the problem of insufficient precision caused by excessive simplification of model components is also avoided. The application can obtain a high-quality and high-precision light-weight mining dump truck model under the condition of reducing the calculation difficulty, and is used for guiding production design.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 shows a flowchart of a method for acquiring a lightweight model of an engineering vehicle according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a physical unit of a bottom connector corresponding to a first sub-model according to a first embodiment of the present invention;
fig. 3 shows a schematic diagram of a shell unit of a cabin board corresponding to a second sub-model in the first embodiment of the invention;
FIG. 4 shows a solid three-dimensional model of a bottom connector corresponding to a third sub-model of the first embodiment of the present invention;
Fig. 5 shows a block diagram of a user terminal according to a third embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The method provided by the invention can be applied to the acquisition of a lightweight model of an engineering vehicle, in particular to a mining dump truck, and the mining dump truck is found to be formed by splicing a plurality of thicker steel plates through research, and part of the components have high load and high strength and precision requirements. Therefore, these factors are currently required to be comprehensively considered in the design process of the vehicle model. However, the existing vehicle model design scheme has a plurality of defects, and is not suitable for the lightweight design of large-scale engineering vehicles. For example, CAE (Computer Aided Engineering, computer aided engineering; an approximate numerical analysis method for solving problems such as complex engineering, structural strength, rigidity, buckling stability, dynamic response, heat conduction, three-dimensional multi-body contact, elastoplasticity and other mechanical properties of products, and optimization design of structural properties by computer aided solution) models of vehicles all adopt entity units, splice part defects easily occur after extraction of middle surfaces by finite element analysis software, so that analysis results are inaccurate, and model parameterization and lightweight design of mining dump trucks are difficult to complete. If all the CAE models adopt shell units, the joint of the mining dump truck and the frame is too simplified, the calculation accuracy cannot be ensured, and parameterization is difficult to realize. One or more of the following embodiments are described in terms of mining dump trucks in large industrial vehicles.
First embodiment
Referring to fig. 1, fig. 1 shows a method for obtaining a lightweight model of an engineering vehicle according to a first embodiment of the present invention, where the method includes:
step S10: constructing a first vehicle model of the mining dump truck by adopting first simulation software;
step S20: dividing a first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model;
step S30: converting the first sub-model into a third sub-model of the solid model by adopting second simulation software, and converting the second sub-model into a fourth sub-model with variable thickness parameters to obtain a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model;
step S40: performing first-standard finite element mesh division on the third sub-model by adopting third simulation software, and performing second-standard finite element mesh division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion;
Step S50: and setting a boundary condition for the third vehicle model in the third simulation software, and performing thickness reduction simulation under the boundary condition to obtain a lightweight vehicle model.
In step S10, the first simulation software may be Pro/Engineer, solidworks, UG (Unigraphics NX), etc., without limitation. In addition, in order to easily implement steps S30-S50 of the present invention, the second simulation software may be Spaceclaim, and the third simulation software may be workbench.
And in the first simulation software, the vehicle model can be built directly according to the engineering vehicle structure which is required to be developed. When the method is used for construction, a curved surface-based three-dimensional CAE model can be generated in a curved surface mode. In order to save computational resources, an initial model of a vehicle is constructed when a vehicle model is constructed, and then, part of model components of the initial model are omitted and simplified, and the simplified model components should satisfy the following requirements: parts which have little effect on structural load-bearing capacity, such as: small-sized reinforcing ribs, welded parts, small holes, etc.
Step S20: dividing a first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model.
In step S20, the bearing structural features of the model component may be specifically classified into two major categories, the first category being structural parts that have a greater influence on the bearing capacity, such as bottom connectors; the second type is a structural part with less influence on the carrying capacity, such as a carriage plate and other parts. The load-carrying capacity of the model parts can also be differentiated by numerical quantification, for example, the stress and/or deformation of each model part in the entire first vehicle model. The standard of the quantitative numerical value can be adjusted and set according to the production experience, and is not repeated herein.
Further, step S20 includes:
step S21: distributing entity units to model components with larger influence on the bearing capacity in the first vehicle model;
step S22: assigning a shell element to a model component having less influence on the load carrying capacity in the first vehicle model;
step S23: the first sub-model and the second sub-model are obtained from the entity units and the shell units assigned to the model components of the first vehicle model.
In the steps S21-S23, the grid size of the entity units is extremely small, the number of grids is numerous, the precision is high, the calculation speed is low, the grid size of the shell units is relatively large, the number of grids is small, the calculation speed is high, the entity units are distributed for the bottom connecting piece, the shell units are distributed for the parts such as the carriage plate, and therefore the accuracy of subsequent grid division can be achieved, and the calculation complexity can be reduced. Wherein the first sub-model corresponds to a physical unit, such as the bottom connector 100 shown in fig. 2; the second sub-model corresponds to the shell element, such as the car floor 200 shown in fig. 3.
Because the shell units correspond to model components with small influence on bearing capacity, and in the mining dump truck, the components are usually parts such as carriage plates, the accuracy of simulation of the shell units can be ensured even if the shell units are distributed as the shell units, and meanwhile, the calculation resources and time are saved.
Step S30: converting the first sub-model into a third sub-model of the solid model by adopting second simulation software, and converting the second sub-model into a fourth sub-model with variable thickness parameters to obtain a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model.
In step S30, the first vehicle model generated by the first simulation software may be imported into Spaceclaim software. Further, step S30 includes the following specific embodiments:
step S31: and carrying out thickness lifting on the curved surface three-dimensional model of the first sub-model to obtain a third sub-model. And stretching the curved surface three-dimensional model of the first sub-model to obtain a thickness, and generating a solid three-dimensional model, namely a third sub-model. A solid three-dimensional model 100a characterizing the bottom connector is shown in fig. 4.
Step S32: grouping model components in the second sub-model based on thickness to obtain a component group; wherein the model components with the same thickness in the component group are one group. The thickness parameters of the model parts can be conveniently and more efficiently adjusted through grouping, namely, the thickness parameters of each group can be correspondingly adjusted to the thickness parameters of each model part in the group.
Step S33: and setting variable thickness parameters for each group of model components in the component group to obtain a fourth sub-model. Specifically, model components of the same thickness (e.g., cabin panels) are grouped using the grouping function in Spaceclaim, and are given variable thickness parameters by way of giving thickness values.
Step S34: and obtaining a second vehicle model according to the third sub-model and the fourth sub-model. I.e. the third sub-model and the fourth sub-model constitute the second vehicle model.
Step S40: performing first-standard finite element mesh division on the third sub-model by adopting third simulation software, and performing second-standard finite element mesh division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion.
In the implementation in step S40, the second vehicle model obtained in the Spaceclaim may be imported into the Workbench through the interface between the Spaceclaim and the Workbench. Specifically, parameters of the third sub-model and the fourth sub-model are transmitted from the Spaceclaim to the Workbench, so that model parameter deletion caused by simultaneous transmission of model parameters of different units can be avoided, and further, the accuracy of subsequent modeling is improved. And then, carrying out finite element mesh division of different standards on the third sub-model and the fourth sub-model respectively to form joint mesh division. Since the allocation of the entity units and the shell units is performed according to the bearing capacity impact size in step S20. When the joint grid division is carried out, the difficulty of finite element grid division is reduced, more accurate grid division of the entity unit part is realized, the calculation precision of the model is ensured, and meanwhile, the calculation time of the model and the grid division difficulty are greatly shortened.
The degree of refinement of the first standard and the second standard may be set according to the actual model requirement, and is not limited.
Step S50: and setting a boundary condition for the third vehicle model in the third simulation software, and performing thickness reduction simulation under the boundary condition to obtain a lightweight vehicle model.
In step S50, a boundary condition of the third vehicle model is set in the third simulation software, and the mass of the model is constrained while the model is lightweight by the boundary condition, the boundary condition including at least: maximum stress conditions and maximum displacement conditions; the maximum stress condition indicates that the maximum stress in the lightweight vehicle model is smaller than or equal to a preset stress value, and the maximum displacement condition indicates that the maximum deformation displacement in the lightweight vehicle model is smaller than or equal to a preset displacement. The preset stress value and the preset displacement can be determined according to historical vehicle design data.
In step S50, a thickness reduction simulation is performed under the boundary conditions to obtain a specific embodiment of the lightweight vehicle model, which may include the steps of:
step S51: performing simulation analysis on stress and displacement of the third vehicle model to obtain a simulation result;
Step S52: judging whether the simulation result accords with the boundary condition;
if yes, reducing the thickness of the third sub-model in the second simulation software to obtain a first thickness; and/or reducing the thickness of the fourth sub-model in the second simulation software to obtain a second thickness;
step S53: transmitting the first thickness and the second thickness to the third simulation software for model construction to obtain a fourth vehicle model for continuous simulation analysis; if the simulation result corresponding to the fourth vehicle model meets the boundary condition, continuing to reduce the thickness of the third sub-model and the thickness of the fourth sub-model; and obtaining the lightweight vehicle model until the fourth vehicle model meets the boundary condition and the thickness of the third sub model and the thickness of the fourth sub model are minimum.
In step S52, the thickness adjustment of the third sub-model and the fourth sub-model may be one or both of the adjustment; when a certain sub-model reaches a thickness minimum value meeting the boundary condition in advance, the thickness of the model with the thickness minimum value can be adjusted only in the third sub-model and the fourth sub-model.
And (3) performing thickness optimization on the fourth vehicle model under the condition that the boundary condition is met through the steps S51-S53, and finally obtaining the fourth vehicle model with the minimum thickness when the boundary condition is met, namely the lightweight vehicle model which can be finally used for guiding production.
In order to make the concept and solution logic of the present invention more clear, the present embodiment is described by a specific example:
in this example, the stress value of the maximum stress condition is set to 220MPa, and the displacement of the maximum displacement condition is set to 15mm.
The first thickness of the parameterization setting in the Spaceclaim for the third sub-model of the solid unit is generalized to para1 and the second thickness of the parameterization setting for the fourth sub-model of the shell unit is generalized to para2.
Further, the simulation result of the third vehicle model established in Workbench through para1 and para2 under the working condition Ci is that the maximum stress value is 200MPa, the maximum displacement is 10mm, and the maximum stress value is 200MPa and the maximum displacement is 10mm, and does not exceed the set maximum stress condition 220MPa and the set maximum displacement condition 15mm. In this case, the parameters of the Spaceclaim and the Workbench 2 may be adjusted, for example, the parameters of the Spaceclaim and the Workbench 2 may be transmitted because the parameters of the Spaceclaim and the Workbench 2 may be reduced to the parameters of the para1a and the para2 b, and the fourth vehicle model may be obtained after the parameters of the Spaceclaim and the Workbench 2 are reduced. And the para1a and the para2a are transmitted to a Workbench to construct a fourth vehicle model.
Further, the analysis result of simulation of the fourth vehicle model established in the Workbench through the para1a and the para2a under the working condition Ci is that the maximum stress value is 210MPa, the maximum displacement is 13mm, and the set maximum stress condition is 220MPa and the set maximum displacement condition is 15mm, so that the para1a and the para2a can be continuously reduced, and further the lightweight optimizing calculation of the mining dump truck is realized. In this embodiment, the optimizing calculation may be performed by the Optimization module of the workbench.
If the fourth vehicle model created by the para1a and the para2a in the Workbench has the maximum stress value of 230MPa and the maximum displacement of 16mm as the result of the simulation under the condition Ci, the thickness values of the para1a and the para2a are too small, and the model corresponding to the simulation result satisfying the boundary condition for the last time can be used as the final lightweight vehicle model. In addition, when the thickness values of the para1a and the para2a are too small, the thickness values of the para1a and the para2a with small steps can be increased, and the simulation is continued by the method, and when the obtained model thickness values meet the boundary conditions, the model can be used as a final lightweight vehicle model.
In summary, according to the method for acquiring the engineering vehicle lightweight model, the first vehicle model of the constructed mining dump truck is split, and the split is performed based on the characteristics of the bearing structure, so that the influence of different model components in the first vehicle model on the whole truck can be effectively distinguished. And then, performing model conversion on the first sub-model and the second sub-model which are obtained after the disassembly to obtain a third sub-model which is a solid model and a fourth sub-model with variable thickness parameters. After model conversion, the finite element meshing of the model components with different influence sizes can be divided, namely finer finite element meshing is performed on the structural part with larger influence on the bearing capacity, rough finite element meshing is performed on the structural part with smaller influence on the bearing capacity, and therefore the accurate and reliable parameters of important components can be ensured during simulation analysis. The relatively coarse finite element mesh is divided among relatively less important components, whereas the less important components are typically cabin boards or the like, and even the relatively coarse finite element mesh can ensure higher calculation accuracy while saving calculation time. In the embodiment of the invention, the first vehicle model is split, so that model parameter deletion caused by simultaneous transmission of model parameters of different model components can be avoided, and the accuracy of subsequent model establishment is further improved. Finally, by adjusting the model thicknesses of the third sub-model and the fourth sub-model respectively, the problem that the splicing part is lost easily after the middle surface is extracted in the finite element model process can be avoided, and meanwhile, the problem of insufficient precision caused by excessive simplification of model components is also avoided. The invention can obtain a high-quality and high-precision light-weight mining dump truck model under the condition of reducing the calculation difficulty, and is used for guiding production design.
Second embodiment
Referring to fig. 5, based on the same inventive concept, the present embodiment provides an engineering vehicle lightweight model obtaining apparatus 300, where the apparatus 300 includes:
the model construction module 301 is configured to construct a first vehicle model of the mining dump truck by using first simulation software; a model splitting module 302, configured to split the first vehicle model into a first sub-model and a second sub-model according to a load-bearing structure characteristic of each model component in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model; the model conversion module 303 is configured to convert the first sub-model into a third sub-model of the solid model in second simulation software, and convert the second sub-model into a fourth sub-model with variable thickness parameters, so as to obtain a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model; the meshing module 304 is configured to perform first-standard finite element meshing on the third sub-model by using third simulation software, and perform second-standard finite element meshing on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion; and the thickness adjustment module 305 is configured to set a boundary condition for the third vehicle model in the third simulation software, and perform thickness reduction simulation under the boundary condition to obtain a lightweight vehicle model.
As an alternative implementation manner, the second simulation software is Spaceclaim, and the third simulation software is workbench.
As an alternative embodiment, the model splitting module 302 is further configured to:
distributing entity units to model components with larger influence on the bearing capacity in the first vehicle model; assigning a shell element to a model component having less influence on the load carrying capacity in the first vehicle model; the first sub-model and the second sub-model are obtained from the entity units and the shell units assigned to the model components of the first vehicle model.
As an alternative embodiment, the model conversion module 303 is further configured to:
carrying out thickness lifting on the curved surface three-dimensional model of the first sub-model to obtain a third sub-model; grouping model components in the second sub-model based on thickness to obtain a component group; wherein the model components with the same thickness in the component group are a group; setting variable thickness parameters for each group of model components in the component group to obtain a fourth sub-model; and obtaining a second vehicle model according to the third sub-model and the fourth sub-model.
As an alternative embodiment, the thickness adjustment module 305 is configured to:
Reducing the thickness of the third sub-model in the second simulation software to obtain a first thickness; reducing the thickness of the fourth sub-model in the second simulation software to obtain a second thickness; transmitting the first thickness and the second thickness to the third simulation software for model construction to obtain a fourth vehicle model for continuous simulation analysis; judging whether the fourth vehicle model accords with the boundary condition; if the simulation result corresponding to the fourth vehicle model meets the boundary condition, continuing to reduce the thickness of the third sub-model and the thickness of the fourth sub-model; and obtaining the lightweight vehicle model until the fourth vehicle model meets the boundary condition and the thickness of the third sub model and the thickness of the fourth sub model are minimum.
As an alternative embodiment, the boundary condition includes: maximum stress conditions and maximum displacement conditions; the maximum stress condition indicates that the maximum stress in the lightweight vehicle model is smaller than or equal to a preset stress value, and the maximum displacement condition indicates that the maximum deformation displacement in the lightweight vehicle model is smaller than or equal to a preset displacement.
It should be noted that, the specific implementation and the technical effects of the apparatus 300 provided in the embodiment of the present invention are the same as those of the embodiment of the foregoing method, and for brevity, reference may be made to the corresponding content in the embodiment of the foregoing method for the part of the embodiment of the apparatus that is not mentioned.
Third embodiment
In addition, based on the same inventive concept, a third embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, realizes the steps of:
constructing a first vehicle model of the mining dump truck by adopting first simulation software; dividing a first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model; converting the first sub-model into a third sub-model of the solid model by adopting second simulation software, and converting the second sub-model into a fourth sub-model with variable thickness parameters to obtain a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model; performing first-standard finite element mesh division on the third sub-model by adopting third simulation software, and performing second-standard finite element mesh division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion; and setting a boundary condition for the third vehicle model in the third simulation software, and performing thickness reduction simulation under the boundary condition to obtain a lightweight vehicle model.
It should be noted that, in the computer readable storage medium provided in this embodiment, the specific implementation and the technical effects of each step are the same as those of the foregoing method embodiment, and for brevity, reference may be made to the corresponding content in the foregoing method embodiment for the sake of brevity.
The functional modules integrated with the apparatus provided by the present invention may be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above-described embodiments, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of the above-described method embodiments when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, the present invention is not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functions of some or all of the components in the apparatus 300 according to embodiments of the present invention may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present invention can also be implemented as an apparatus or device program (e.g., a computer program and a computer program product) for performing a portion or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
Claims (7)
1. The method for acquiring the engineering vehicle lightweight model is characterized by comprising the following steps:
constructing a first vehicle model of the mining dump truck by adopting first simulation software;
dividing a first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model;
converting the first sub-model into a third sub-model of the solid model by adopting second simulation software, and converting the second sub-model into a fourth sub-model with variable thickness parameters to obtain a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model;
performing first-standard finite element mesh division on the third sub-model by adopting third simulation software, and performing second-standard finite element mesh division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion;
Setting a boundary condition for the third vehicle model in the third simulation software, and performing thickness reduction simulation under the boundary condition to obtain a lightweight vehicle model;
the second simulation software is Spaceclaim, and the third simulation software is workbench;
the boundary conditions include: maximum stress conditions and maximum displacement conditions; the maximum stress condition indicates that the maximum stress in the lightweight vehicle model is smaller than or equal to a preset stress value, and the maximum displacement condition indicates that the maximum deformation displacement in the lightweight vehicle model is smaller than or equal to a preset displacement.
2. The method of claim 1, wherein the splitting the first vehicle model into a first sub-model and a second sub-model based on the load-bearing structural characteristics of each model component in the first vehicle model comprises:
distributing entity units to model components with larger influence on the bearing capacity in the first vehicle model;
assigning a shell element to a model component having less influence on the load carrying capacity in the first vehicle model;
the first sub-model and the second sub-model are obtained from the entity units and the shell units assigned to the model components of the first vehicle model.
3. The method of claim 1, wherein said employing the second simulation software to transform the first sub-model into a third sub-model and the second sub-model into a fourth sub-model to obtain the second vehicle model comprises:
carrying out thickness lifting on the curved surface three-dimensional model of the first sub-model to obtain a third sub-model;
grouping model components in the second sub-model based on thickness to obtain a component group; wherein the model components with the same thickness in the component group are a group;
setting variable thickness parameters for each group of model components in the component group to obtain a fourth sub-model;
and obtaining a second vehicle model according to the third sub-model and the fourth sub-model.
4. The method of claim 1, wherein said performing thickness reduction simulation under said boundary conditions to obtain a lightweight vehicle model comprises:
performing simulation analysis on stress and displacement of the third vehicle model to obtain a simulation result;
judging whether the simulation result accords with the boundary condition;
if yes, reducing the thickness of the third sub-model in the second simulation software to obtain a first thickness; and/or reducing the thickness of the fourth sub-model in the second simulation software to obtain a second thickness;
Transmitting the first thickness and the second thickness to the third simulation software for model construction to obtain a fourth vehicle model for continuous simulation analysis;
if the simulation result corresponding to the fourth vehicle model meets the boundary condition, continuing to reduce the thickness of the third sub-model and the thickness of the fourth sub-model; and obtaining the lightweight vehicle model until the fourth vehicle model meets the boundary condition and the thickness of the third sub model and the thickness of the fourth sub model are minimum.
5. An engineering vehicle lightweight model acquisition device, characterized in that the device comprises:
the model construction module is used for constructing a first vehicle model of the mining dump truck by adopting first simulation software;
the model splitting module is used for splitting the first vehicle model into a first sub-model and a second sub-model according to the bearing structure characteristics of each model part in the first vehicle model; the first sub-model is a structural part with larger influence on bearing capacity in the first vehicle model, and the second sub-model is a structural part with smaller influence on bearing capacity in the first vehicle model;
The model conversion module is used for converting the first sub model into a third sub model of the solid model in second simulation software, converting the second sub model into a fourth sub model with variable thickness parameters, and obtaining a second vehicle model; wherein the second vehicle model is constituted by the third sub-model and the fourth sub-model;
the grid division module is used for carrying out first-standard finite element grid division on the third sub-model by adopting third simulation software, and carrying out second-standard finite element grid division on the fourth sub-model to obtain a third vehicle model; wherein the first criterion and the second criterion represent the size of a finite element mesh, the first criterion being smaller than the second criterion;
the thickness adjustment module is used for setting boundary conditions for the third vehicle model in the third simulation software and performing thickness reduction simulation under the boundary conditions to obtain a lightweight vehicle model;
the second simulation software is Spaceclaim, and the third simulation software is workbench;
the boundary conditions include: maximum stress conditions and maximum displacement conditions; the maximum stress condition indicates that the maximum stress in the lightweight vehicle model is smaller than or equal to a preset stress value, and the maximum displacement condition indicates that the maximum deformation displacement in the lightweight vehicle model is smaller than or equal to a preset displacement.
6. The apparatus of claim 5, wherein the model splitting module is further configured to:
distributing entity units to model components with larger influence on the bearing capacity in the first vehicle model;
assigning a shell element to a model component having less influence on the load carrying capacity in the first vehicle model;
the first sub-model and the second sub-model are obtained from the entity units and the shell units assigned to the model components of the first vehicle model.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-4.
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