CN110705145B - Dust analysis method and device for vehicle and computer readable storage medium - Google Patents
Dust analysis method and device for vehicle and computer readable storage medium Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 154
- 238000004458 analytical method Methods 0.000 title claims abstract description 83
- 238000003860 storage Methods 0.000 title claims abstract description 8
- 238000004088 simulation Methods 0.000 claims abstract description 186
- 239000002245 particle Substances 0.000 claims description 92
- 238000001816 cooling Methods 0.000 claims description 51
- 239000013618 particulate matter Substances 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 6
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- 235000011941 Tilia x europaea Nutrition 0.000 description 3
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Abstract
The invention provides a dust analysis method and device for a vehicle and a computer readable storage medium, wherein the method comprises the following steps: acquiring a vehicle simulation model and simulation parameters; determining dust raising parameters of a vehicle simulation model according to the simulation parameters; and determining a target simulation model according to a comparison result of the dust parameters and the dust threshold. According to the dust analysis method for the vehicle, provided by the invention, the dust parameters of the vehicle model are calculated by utilizing the numerical value, the experiment period is shortened, the test cost is reduced, the correction of the vehicle simulation model is realized, the analyzed data is attached to the actual condition of the vehicle, the accuracy of the dust parameters is greatly improved, a more reliable basis is provided for the vehicle design, in addition, the vehicle simulation model can simulate various types of vehicles and road conditions, the dust analysis is not limited by the condition, the various requirements of users are met, and the vehicle design meeting the requirements is conveniently matched.
Description
Technical Field
The present invention relates to the field of automotive technologies, and in particular, to a dust analysis method for a vehicle, a dust analysis device for a vehicle, and a computer readable storage medium.
Background
The cooling fan of the engine has the function of accelerating air flow, so that the heat dissipation performance of the heat dissipation modules such as a radiator, a condenser, an intercooler and the like is improved, and the engine is prevented from being overheated or supercooled. The compactness on the space arrangement of the engine compartment of the commercial vehicle leads to that the fan wind can not well bypass the engine along the axial direction, but the fan wind is flushed to the engine and is diffused all around, and the wind directly guided to the ground can cause dust, thereby causing dust pollution of environmental particles. In addition, when the automobile is windowed, dust easily enters the automobile, so that the interior decoration of the automobile is attached with the dust, the air quality in the automobile is influenced, the body health of personnel in the automobile is threatened, meanwhile, the front windshield is easy to accumulate the dust under the action of high-concentration dust for a long time, the visual field of a driver is blurred, and the driving safety is further influenced.
With the design requirements of heat insulation, sound insulation and intelligence in the engine room, the engine room is more and more complex in design, the circulation resistance of cooling air in the engine room is increased, and with the high power of a vehicle engine and the upgrading of emission regulations, the heat required to be taken away in the engine room is increased year by year. To overcome the greater system resistance and to remove more heat in a confined space, it is necessary to increase the fan diameter or increase the fan speed, increasing the cooling intake flow, but this further exacerbates the dust pollution problem of the vehicle.
At present, the analysis of vehicle raise dust is mainly concentrated in the dust pollution field of the passenger car body, the analysis of large-scale vehicles such as cargo vehicles is lacked, and a manual actual vehicle test mode is mainly adopted, and because of the resource limitation of a sample car and the like, the experiment is difficult, the test cost is high, the test period is also longer, the design change is not facilitated, and meanwhile, the manual detection ensures that the accuracy of the vehicle raise dust analysis is lower, and reliable design basis cannot be provided for users.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, a first aspect of the present invention is to provide a dust analysis method for a vehicle.
A second aspect of the present invention is to provide a dust analysis device for a vehicle.
A third aspect of the present invention is directed to a computer-readable storage medium.
In view of this, according to a first aspect of the present invention, there is provided a dust analysis method of a vehicle, the method comprising: acquiring a vehicle simulation model and simulation parameters; determining dust raising parameters of a vehicle simulation model according to the simulation parameters; and determining a target simulation model according to a comparison result of the dust parameters and the dust threshold.
According to the dust analysis method of the vehicle, the dust parameters of the model are simulated through the simulation parameters and the vehicle simulation models, the dust parameters of the vehicle model are calculated by utilizing the numerical values, the experimental period is shortened, the test cost is reduced, the target simulation model is determined according to the comparison result of the dust parameters and the dust threshold value, the correction of the vehicle simulation model is realized, the analyzed data are attached to the actual condition of the vehicle, the accuracy of the dust parameters is greatly improved, more reliable basis is provided for the vehicle design, in addition, the vehicle simulation model can simulate various types of vehicles and road conditions, the dust analysis is not limited by conditions, the various requirements of users are met, and the vehicle design meeting the requirements is conveniently matched.
Specifically, the dust parameters include at least one of: wind speed, wind direction gradient, particle viscosity and particle quantity; the simulation parameters include at least one of: particulate matter incidence area, incidence velocity, incidence volume flow rate, particulate matter particle size, average diameter; preferably, in the stationary state, a projection area of the vehicle body on the ground is set as the particulate matter incident area.
It is worth mentioning that the Discrete Phase Model (DPM) is adopted to set simulation parameters and capture dust raising parameters of the vehicle model so as to facilitate the subsequent analysis of the deposition concentration and distribution of the particulate matters on the surface of the vehicle body.
Further, after determining the target simulation model, if the dust emission parameter meets the preset parameter range, the design scheme of the vehicle simulation model is proved to meet the user requirement, and the feasibility information is output, wherein the preset parameter range can be reasonably set according to the user requirement or the dust emission threshold value, and can be the same as the national standard.
In addition, according to the dust analysis method of the vehicle in the technical scheme provided by the invention, the method also has the following additional technical characteristics:
in the above technical solution, preferably, the dust parameter includes at least a wind speed, and the step of determining the target simulation model according to a comparison result between the dust parameter and the dust threshold specifically includes: if the wind speed is smaller than the wind speed threshold value, taking the vehicle simulation model as a target simulation model; if the wind speed is greater than or equal to the wind speed threshold value, correcting the vehicle simulation model according to the flow field index; wherein the flow field index comprises at least one of the following: wind speed index, wind direction index, pressure index.
According to the technical scheme, the wind speed threshold value is the wind speed when the concentration of the raised particulate matters of the vehicle reaches the concentration threshold value, the wind speed of the vehicle simulation model is determined through simulation parameters, whether the wind speed threshold value is met or not is judged, if the wind speed is smaller than the wind speed threshold value, the raised particulate matters of the vehicle simulation model are proved to be consistent with the actual vehicle, the vehicle simulation model is taken as a target simulation model, accurate dust analysis is conveniently carried out through the target simulation model subsequently, if the wind speed is larger than or equal to the wind speed threshold value, the difference between the vehicle simulation model and the actual vehicle is demonstrated, the vehicle simulation model is corrected according to flow field indexes, and therefore the vehicle simulation model is enabled to be closest to the actual vehicle to the greatest extent, the accuracy of dust analysis is guaranteed, and more reliable data are provided for vehicle design.
Specifically, a dust emission testing device is adopted to test flow field indexes of a vehicle, the vehicle is positioned during testing, the flow field difference of different positions of the vehicle is considered, the bottom area of the vehicle is divided into a plurality of testing areas, the plurality of testing areas can be 4*4 distributed, 10 x 10 distributed or other distributed modes, the vehicle is started, when the concentration of raised particles reaches a preset value, parameters such as wind speed, wind direction and pressure of each testing area are collected, the obtained parameters are used as flow field indexes for simulation analysis, and correction of a vehicle simulation model is guided, wherein the preset value of the concentration of the particles can be reasonably set according to the requirements of a user, the flow field indexes can be parameters of a certain testing area, can be integral parameters obtained through statistics of the parameters of the plurality of testing areas, and can be determined according to the actual measuring area of the user.
In any of the above technical solutions, preferably, the dust emission parameters include at least wind speed, particle viscosity and particle quantity, and the determining the target simulation model according to a comparison result between the dust emission parameters and the dust emission threshold value specifically includes: determining cooling parameters of the vehicle simulation model according to the wind speed, the particle viscosity and the particle quantity; if the cooling parameter meets the cooling threshold range, taking the vehicle simulation model as a target simulation model; if the cooling parameter exceeds the cooling threshold range, correcting the vehicle simulation model according to the cooling index; wherein the cooling index comprises at least one of the following: an air inlet temperature index and a mass flow rate index.
According to the technical scheme, the wind speed, the particle viscosity and the particle quantity of the vehicle simulation model are determined through simulation parameters, the cooling parameters of the vehicle simulation model are determined according to the wind speed, the particle viscosity and the particle quantity, whether the cooling threshold range is met or not is judged, if the cooling parameters meet the cooling threshold range, the vehicle simulation model is regarded as a target simulation model, accurate dust analysis is conveniently carried out through the target simulation model subsequently, if the cooling parameters exceed the cooling threshold range, the vehicle simulation model is corrected according to the cooling index, and therefore the vehicle simulation model is enabled to be closest to the actual vehicle to the greatest extent.
In addition, the vehicle simulation model can be optimized through the wind speed and the cooling performance at the same time, multi-target correction is realized, the accuracy of dust analysis is further improved, and more reliable data are provided for vehicle design.
In any of the above solutions, preferably, the step of determining dust emission parameters of the vehicle simulation model according to the simulation parameters specifically includes: acquiring a key area of a vehicle simulation model; and determining dust raising parameters of the key area according to the simulation parameters.
According to the technical scheme, the key areas of the vehicle simulation model are obtained, so that the testing and analysis of the flow field characteristics of the key areas (such as wheels, engine cabins and the like) are realized, the dust analysis flow is optimized, the testing efficiency is improved, the testing resources are saved, the targeted modification and the design of the vehicle are facilitated, and the user demands are met to the greatest extent.
In any of the above solutions, preferably, the step of obtaining a vehicle simulation model specifically includes: obtaining model parameters; constructing a vehicle simulation model according to model parameters; meshing a vehicle simulation model; and carrying out grid encryption processing on the key area of the vehicle simulation model.
In the technical scheme, when the vehicle performance test is carried out, a user only needs to input model parameters of the vehicle, the vehicle simulation model can be simulated through numerical values, and the vehicle simulation model is divided into grids, so that the complex vehicle simulation model is converted into a simple finite element model, the convergence of analysis data is facilitated, and in consideration of the problem that the vehicle space area is large, the grids adopt a gradient progressive division mode, namely, the grids are encrypted on key areas of the vehicle simulation model, so that the calculation precision of the key areas is improved.
Specifically, the vehicle simulation model is simplified before meshing is performed.
In any of the above solutions, it is preferable that a vehicle simulation model is constructed using computational fluid dynamics simulation.
In the technical scheme, a vehicle simulation model is built by utilizing computational fluid dynamics simulation (CFD, computational Fluid Dynamics), and the optimization analysis of various schemes is completed in a short time, so that dust analysis is not limited by conditions, the information is rich, the cost is low, the period is short, various requirements of users are met, and the efficient vehicle design is realized.
In any of the above aspects, preferably, the mesh comprises a tetrahedral mesh and/or a hexahedral mesh; the grid is square or rectangular.
In the technical scheme, tetrahedral grids and/or hexahedral grids with good body adhesion are adopted for dividing the whole model, the hexahedral grids are used for encrypting the grids of the key areas, the grids can be one layer or multiple layers, and therefore calculation accuracy is improved.
In any of the foregoing solutions, preferably, before the step of determining the target simulation model according to a comparison result between the dust raising parameter and the dust raising threshold range, the method further includes: acquiring an initial wind speed, a wind speed increment value and a highest wind speed of a vehicle; collecting the particle concentration of the vehicle, which is regulated from an initial wind speed to a highest wind speed by taking a wind speed increasing value as a step length; and selecting the wind speed corresponding to the particle concentration greater than or equal to the particle concentration threshold as a wind speed threshold.
In the technical scheme, an actual vehicle is adopted to determine a wind speed threshold value, a flying dust analysis device is connected with a flying dust testing device, fine lime or dust with smaller granularity is paved below the vehicle, the vehicle is started, the wind speed generated by the vehicle is controlled to gradually increase from an initial wind speed to a highest wind speed by taking a wind speed increasing value as a step length, the flying dust testing device respectively collects the particle concentration of the vehicle at different wind speeds and sends the particle concentration to the flying dust analysis device, the wind speed corresponding to the first particle concentration which is greater than or equal to the particle concentration threshold value is selected as the wind speed threshold value, namely, the wind speed of the flying particle concentration reaches the particle concentration threshold value, so that the test related to the wind speed of flying particle is verified, and the quantifiable wind speed threshold value is provided, wherein the particle concentration threshold value can be reasonably set according to actual working conditions.
Specifically, before determining the wind speed threshold, the initial wind speed and the highest wind speed can be tested, fans with typical rotation speeds (such as 700r/min, 1300r/min, 1600r/min and 1900 r/min) are respectively set under different road conditions, the concentration of the particles raised by the fans with different rotation speeds is collected by adopting the particle concentration detection device, and the critical threshold (initial wind speed) of the wind speed raised by the particles and the wind speed (highest wind speed) meeting the threshold of the particle concentration are roughly determined by comparing the particle concentration with the threshold of the particle concentration.
According to a second aspect of the present invention, there is provided a dust analysis device for a vehicle, comprising a memory, a processor and a computer program stored on the memory and executable on the processor; the computer program when executed by the processor implements the steps of the dust analysis method of the vehicle in any of the above-mentioned aspects. Therefore, the method has the advantages of the vehicle dust analysis method in any technical scheme.
According to a third aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a dust emission analysis method of a vehicle according to any one of the above-mentioned aspects. Therefore, the method has the advantages of the vehicle dust analysis method in any technical scheme.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic flow diagram of a dust analysis method of a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a dust analysis method of a vehicle according to another embodiment of the invention;
FIG. 3 is a schematic flow chart of a dust analysis method of a vehicle according to another embodiment of the invention;
FIG. 4 is a schematic flow chart of a dust analysis method of a vehicle according to another embodiment of the invention;
FIG. 5 is a schematic flow chart of a dust analysis method of a vehicle according to another embodiment of the invention;
FIG. 6 is a flow chart of a dust analysis method of a vehicle according to another embodiment of the invention;
FIG. 7 is a flow chart of a dust analysis method of a vehicle according to an embodiment of the invention;
fig. 8 shows a schematic view of a dust analysis device of a vehicle according to still another embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and the scope of the invention is therefore not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1, an embodiment of a first aspect of the present invention provides a dust analysis method for a vehicle, including:
102, acquiring a vehicle simulation model and simulation parameters;
104, determining dust raising parameters of a vehicle simulation model according to the simulation parameters;
and step 106, determining a target simulation model according to a comparison result of the dust parameters and the dust threshold.
According to the dust analysis method for the vehicle, the dust parameters of the model are simulated through simulation parameters and vehicle simulation models, the dust parameters of the vehicle model are calculated through numerical values, the experimental period is shortened, the test cost is reduced, the target simulation model is determined according to the comparison result of the dust parameters and the dust threshold value, the correction of the vehicle simulation model is achieved, the analyzed data are attached to the actual condition of the vehicle, the accuracy of the dust parameters is greatly improved, more reliable basis is provided for vehicle design, in addition, the vehicle simulation model can simulate vehicles of various models and road conditions, dust analysis is not limited by conditions, various requirements of users are met, and the vehicle design meeting requirements is achieved through convenient matching.
Specifically, the dust parameters include at least one of: wind speed, wind direction gradient, particle viscosity and particle quantity; the simulation parameters include at least one of: particulate matter incidence area, incidence velocity, incidence volume flow rate, particulate matter particle size, average diameter; preferably, in the stationary state, a projection area of the vehicle body on the ground is set as the particulate matter incident area.
It is worth mentioning that the Discrete Phase Model (DPM) is adopted to set simulation parameters and capture dust raising parameters of the vehicle model so as to facilitate the subsequent analysis of the deposition concentration and distribution of the particulate matters on the surface of the vehicle body.
Preferably, after determining the target simulation model, if the dust emission parameter meets the preset parameter range, the design scheme of the vehicle simulation model is indicated to meet the user requirement, and the feasibility information is output to remind the user of the analysis result, wherein the preset parameter range can be reasonably set according to the user requirement or the dust emission threshold value, and can be the same as the national standard.
Example two
As shown in fig. 2, according to still another embodiment of the present invention, a dust analysis method for a vehicle includes:
step 202, acquiring a vehicle simulation model and simulation parameters;
step 204, determining the wind speed of the vehicle simulation model according to the simulation parameters;
step 206, if the wind speed is less than the wind speed threshold, proceeding to step 208 if yes, proceeding to step 210 if no;
step 208, taking the vehicle simulation model as a target simulation model;
step 210, the vehicle simulation model is modified according to the flow field index, and step 204 is entered.
Wherein the flow field index comprises at least one of the following: wind speed index, wind direction index, pressure index.
In the embodiment, the wind speed threshold is the wind speed when the concentration of the raised particulate matters of the vehicle reaches the concentration threshold, the wind speed of the vehicle simulation model is determined through simulation parameters, whether the wind speed threshold is met or not is judged, if the wind speed is smaller than the wind speed threshold, the raised particulate matters of the vehicle simulation model are proved to be consistent with the actual vehicle, the vehicle simulation model is taken as a target simulation model, accurate dust analysis is conveniently carried out through the target simulation model subsequently, if the wind speed is larger than or equal to the wind speed threshold, the difference between the vehicle simulation model and the actual vehicle is demonstrated, the vehicle simulation model is corrected according to flow field indexes, and therefore the vehicle simulation model is enabled to be closest to the actual vehicle to the greatest extent, the accuracy of dust analysis is guaranteed, and more reliable data is provided for vehicle design.
Specifically, a dust emission testing device is adopted to test flow field indexes of a vehicle, the vehicle is positioned during testing, the flow field difference of different positions of the vehicle is considered, the bottom area of the vehicle is divided into a plurality of testing areas, the plurality of testing areas can be 4*4 distributed, 10 x 10 distributed or other distributed modes, the vehicle is started, when the concentration of raised particles reaches a preset value, parameters such as wind speed, wind direction and pressure of each testing area are collected, the obtained parameters are used as flow field indexes for simulation analysis, and correction of a vehicle simulation model is guided, wherein the preset value of the concentration of the particles can be reasonably set according to the requirements of a user, the flow field indexes can be parameters of a certain testing area, can be integral parameters obtained through statistics of the parameters of the plurality of testing areas, and can be determined according to the actual measuring area of the user.
Preferably, according to an embodiment of the present invention, in addition to the features defined in any one of the above embodiments, the dust analysis method of a vehicle further includes: acquiring an initial wind speed, a wind speed increment value and a highest wind speed of a vehicle; collecting the particle concentration of the vehicle, which is regulated from an initial wind speed to a highest wind speed by taking a wind speed increasing value as a step length; and selecting the wind speed corresponding to the particle concentration greater than or equal to the particle concentration threshold as a wind speed threshold.
In the embodiment, an actual vehicle is adopted to determine a wind speed threshold value, a flying dust analysis device is connected with a flying dust testing device, fine lime or dust with smaller granularity is paved below the vehicle, the vehicle is started, the wind speed generated by the vehicle is controlled to gradually increase from an initial wind speed to a highest wind speed by taking a wind speed increasing value as a step length, the flying dust testing device respectively collects the particle concentration of the vehicle at different wind speeds and sends the particle concentration to the flying dust analysis device, the wind speed corresponding to the first particle concentration which is greater than or equal to the particle concentration threshold value is selected as the wind speed threshold value, namely, the wind speed of the flying particle concentration reaches the particle concentration threshold value, so that tests related to the wind speed of flying particles are verified, and the quantifiable wind speed threshold value is provided, wherein the particle concentration threshold value can be reasonably set according to actual working conditions.
Specifically, before determining the wind speed threshold, the initial wind speed and the highest wind speed can be tested, fans with typical rotation speeds (such as 700r/min, 1300r/min, 1600r/min and 1900 r/min) are respectively set under different road conditions, the concentration of the particles raised by the fans with different rotation speeds is collected by adopting the particle concentration detection device, and the critical value (initial wind speed) of the wind speed raised by the particles and the wind speed (highest wind speed) meeting the particle concentration threshold are roughly determined by comparing the particle concentration with the particle concentration threshold.
Example III
As shown in fig. 3, according to still another embodiment of the present invention, a dust analysis method for a vehicle includes:
step 302, acquiring a vehicle simulation model and simulation parameters;
step 304, determining the wind speed, the particle viscosity and the particle quantity of the vehicle simulation model according to the simulation parameters;
step 306, determining cooling parameters of the vehicle simulation model according to the wind speed, the particle viscosity and the particle quantity;
step 308, if the cooling parameter meets the cooling threshold range, go to step 310, if not, go to step 312;
step 310, taking the vehicle simulation model as a target simulation model;
step 312, the vehicle simulation model is modified according to the cooling index, and the process proceeds to step 304.
Wherein the cooling index comprises at least one of the following: an air inlet temperature index and a mass flow rate index.
In the embodiment, the wind speed, the particle viscosity and the particle quantity of the vehicle simulation model are determined through simulation parameters, the cooling parameters of the vehicle simulation model are determined according to the wind speed, the particle viscosity and the particle quantity, whether the cooling threshold range is met or not is judged, if the cooling parameters meet the cooling threshold range, the vehicle simulation model is taken as a target simulation model to be convenient for the follow-up dust analysis through the target simulation model, if the cooling parameters exceed the cooling threshold range, the vehicle simulation model is corrected according to the cooling index to enable the vehicle simulation model to be close to the actual vehicle to the greatest extent, and if the cooling parameters exceed the cooling threshold range, the vehicle simulation model is different from the actual vehicle.
Specifically, a dust emission testing device is adopted to test flow field indexes of a vehicle, the vehicle is positioned during testing, the flow field difference of different positions of the vehicle is considered, the bottom area of the vehicle is divided into a plurality of testing areas, the plurality of testing areas can be 4*4 distributed, 10 x 10 distributed or other distributed modes, the vehicle is started, when the concentration of raised particles reaches a preset value, parameters such as wind speed, wind direction, pressure, particle adhesion degree, particle size number and the like of each testing area are collected, the obtained overall parameters are counted through the parameters of the plurality of testing areas, the cooling indexes of the vehicle are calculated according to the parameters, and correction of a vehicle simulation model is guided, wherein the preset value of the concentration of the particles can be reasonably set according to user requirements.
Example IV
As shown in fig. 4, according to still another embodiment of the present invention, a dust analysis method for a vehicle includes:
step 402, obtaining a vehicle simulation model and simulation parameters;
step 404, determining the wind speed, the particle viscosity and the particle quantity of the vehicle simulation model according to the simulation parameters;
step 406, if the wind speed is less than the wind speed threshold, go to step 408 if yes, go to step 410 if no;
step 408, determining cooling parameters of the vehicle simulation model according to the wind speed, the particle viscosity and the particle quantity, and proceeding to step 412;
step 410, correcting the vehicle simulation model according to the flow field index, and entering step 404;
step 412, if the cooling parameter meets the cooling threshold range, go to step 414, if not, go to step 416;
step 414, taking the vehicle simulation model as a target simulation model;
step 416, the vehicle simulation model is modified according to the cooling index, and step 404 is entered.
In the technical scheme, the vehicle cooling parameters and the dust emission parameters are considered at the same time, so that multi-objective optimization is realized, the accuracy of dust emission analysis is further improved, and more reliable data are provided for vehicle design.
Example five
As shown in fig. 5, according to still another embodiment of the present invention, a dust analysis method for a vehicle includes:
step 502, acquiring a vehicle simulation model and simulation parameters;
step 504, obtaining a key area of a vehicle simulation model;
step 506, determining the wind speed of the key area according to the simulation parameters;
step 508, if the wind speed is less than the wind speed threshold, go to step 510, if not, go to step 512;
step 510, taking the vehicle simulation model as a target simulation model;
step 512, the vehicle simulation model is modified according to the flow field index, and step 506 is entered.
In the embodiment, the testing and analysis of the flow field characteristics of the key areas (such as wheels, engine cabins and the like) are realized by acquiring the key areas of the vehicle simulation model, so that the dust analysis flow is optimized, the testing efficiency is improved, the testing resources are saved, the targeted modification and the design of the vehicle are facilitated, and the user demands are met to the greatest extent.
Example six
As shown in fig. 6, according to still another embodiment of the present invention, a dust analysis method of a vehicle includes:
step 602, obtaining model parameters and simulation parameters;
step 604, constructing a vehicle simulation model according to model parameters;
step 606, meshing the vehicle simulation model;
step 608, acquiring a key area of the vehicle simulation model, and performing grid encryption processing on the key area;
step 610, determining dust raising parameters of a key area of a vehicle simulation model according to simulation parameters;
step 612, determining a target simulation model according to the comparison result of the dust parameter and the dust threshold.
In the embodiment, when the vehicle performance test is performed, a user only needs to input model parameters of the vehicle, and can simulate the vehicle simulation model through a numerical value, and the vehicle simulation model is divided into grids, so that the complex vehicle simulation model is converted into a simple finite element model, the convergence of analysis data is facilitated, and in consideration of the problem that the vehicle space area is large, the grids adopt a gradient progressive division mode, namely, the grids are encrypted on key areas of the vehicle simulation model, so that the calculation precision of the key areas is improved.
Wherein the model parameters include: the vehicle simulation model structure is correspondingly simplified before grid division is carried out on a vehicle engine, wheels, an air inlet grid, a cooling system, an air inlet system, an air outlet system, a vehicle frame and the like.
Preferably, a vehicle simulation model is built by utilizing computational fluid dynamics simulation (CFD, computational Fluid Dynamics), and optimization analysis of various schemes is completed in a short time, so that dust analysis is not limited by conditions, information is rich, cost is low, period is short, various requirements of users are met, and efficient vehicle design is achieved.
Preferably, a tetrahedral grid and/or a hexahedral grid with good body adhesion is used for dividing the whole model, and the hexahedral grid is used for encrypting the grid of the key area, and of course, the grid can be one layer or multiple layers, so that the calculation accuracy is improved, and in addition, a square grid or a rectangular grid, namely, a non-O-shaped grid is used for reducing the misdirection phenomenon during calculation.
Example seven
As shown in fig. 7, according to another embodiment of the present invention, a dust analysis method for a vehicle includes:
step 702, performing digital-analog simplification and grid division on an engine compartment of a vehicle simulation model;
step 704, setting simulation parameters;
step 706, determining dust raising parameters according to the simulation parameters;
step 708, if the dust parameter exceeds the dust threshold, go to step 710 if yes, and go to step 712 if not;
step 710, revising the vehicle simulation model, and entering step 704;
step 712, analyzing the vehicle bottom wind speed, the particle adhesion degree and the particle quantity;
step 714, optimizing the improved vehicle simulation model;
step 716, if the wind speed is less than the wind speed threshold, go to step 720, if not, go to step 714;
step 718, if the wind speed, the adhesion degree of the particles and the number of the particles meet the cooling requirement, step 720 is performed, and if not, step 714 is performed;
step 720, sample vehicle verification;
step 722, if the particulate matter concentration of the sample vehicle is less than the particulate matter concentration threshold, ending the flow if yes, and entering step 714 if not;
step 724, if the water temperature of the inlet and outlet of the engine of the sample car meets the temperature range, if yes, the process is ended, and if not, step 714 is entered.
Wherein the dust parameters include at least one of: wind speed, particulate matter adhesion, particulate matter quantity.
The method comprises the following steps:
1. calibrating an experiment;
1) Dust emission adjustment test; typical fan speeds (such as 1300r/min, 1600 r/mm and 1900 r/min) are tested under different road conditions at a construction site, and raised particle concentration and particle concentration thresholds are compared to determine the adjustment range of the speed, wherein the particle concentration thresholds are related to the vehicle performance and can be reasonably set according to the user requirements.
2) Testing and calibrating flow field characteristics; when the concentration of the particles raised by the vehicle reaches a preset value, a raised dust testing device is adopted to test the flow field characteristics (wind speed and wind direction) of the area right below the bottom of the engine room, the vehicle is fixed during the test, the bottom area is divided into a plurality of small areas, the flow field characteristics of each small area under the typical fan rotating speed working condition are measured, and the flow field characteristics are used as the calibration result of simulation analysis to guide the modification of a simulation model.
3) Testing a wind speed threshold value; and (3) testing the working condition of the vehicle, namely spreading fine lime or dust with the smallest granularity under the engine cabin, gradually increasing the rotating speed (700 r/min-1900 r/min) of the engine for testing, and taking the maximum wind speed at a certain rotating speed as a wind speed threshold when the concentration of the raised particulate matters exceeds a particulate matter concentration threshold, wherein the maximum wind speed at the rotating speed is taken as the basis for designing and developing the dust of the vehicle, and only the wind speed of a flow field at the bottom of the engine cabin of the vehicle is controlled to be smaller than the wind speed threshold.
2. Simulation analysis;
1) Simplifying a model; the components of the vehicle engine, wheels, an air inlet grille, a cooling system, an air inlet system, an air outlet system, a vehicle frame and the like are correspondingly simplified.
2) Dividing grids; the vehicle model is divided by adopting tetrahedral grids and hexahedral grids with good body adhesion. Because the space area is large, the grids adopt a gradient progressive division mode, and the grids near the vehicle body are encrypted to ensure the calculation accuracy.
3) Setting parameters; DPM (discrete phase model) settings mainly include particulate matter incidence area, particulate matter properties, initial parameters, etc. The method mainly researches the action condition of a flow field generated by the rotation of a cooling fan of a commercial vehicle on dust, and the dust is in a static state on a road surface, so that a projection area on the ground of the vehicle body is set as a particle entrance, and meanwhile, parameters such as an incident initial speed, an incident volume flow rate, a minimum particle size, a maximum particle size, an average diameter and the like are set.
4) Simulation analysis; capturing the wind speed of the cabin, and comparing the wind speed area simulation at the bottom of the cabin with a dust threshold value to correct a simulation model; the simulation model is corrected by capturing particle capture adhesion of parts such as an engine, a frame and wheels, capturing the number of blown particles, calculating the air inlet temperature and the mass flow rate of a radiator and comparing the air inlet temperature and the mass flow rate with the engine compartment cooling threshold range.
5) Optimizing; the direction of cooling air flow is changed by changing the structures of the radiator structure, the fan, the air shield and the like, so that the ground blowing is avoided, and whether an optimization scheme is feasible is determined by comparing the air speed of the vehicle bottom, the adhesion of particles and the quantity of blown particles on the premise of ensuring that the heat dissipation performance is not influenced.
6) Verifying a sample vehicle; and (3) carrying out real vehicle verification on a feasible optimization scheme, carrying out vehicle bottom wind speed test on the optimized vehicle, comparing the optimized vehicle with an original vehicle (an un-optimized vehicle), carrying out actual road condition test, observing whether the concentration of particles is improved under the same condition, detecting a water inlet and a water outlet of a radiator, and whether the heat radiation performance is influenced, if the concentration of the particles and the water inlet and the water outlet of the optimization scheme meet the conditions, further proving that the optimization scheme is feasible.
In the embodiment, the requirements of dust analysis of the truck can be met, the flow field characteristics (wind speed and wind direction gradient) of the engine cabin blowing to the ground, different particulate matters concentrations and critical thresholds of the wind speed and the wind direction are simulated and experimentally calibrated through tests, and the model is corrected, so that the analysis precision and accuracy are improved, and a control basis is provided; the heat radiation performance of the engine compartment is comprehensively considered, so that multi-objective optimization is realized, and the multi-objective requirements are met; the subsequent test data based on experiments are convenient, and the dust control method based on the wind speed threshold value at the bottom of the cabin is provided.
Example eight
As shown in fig. 8, according to a second aspect of the present invention, there is provided a dust analysis device 800 of a vehicle, including a memory 802, a processor 804, and a computer program stored on the memory 802 and executable on the processor 804; the computer program when executed by the processor 804 implements the steps of the dust analysis method of the vehicle in any of the above embodiments. Therefore, the method has all the beneficial effects of the dust analysis method of the vehicle in any embodiment.
Example nine
According to a third aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a dust emission analysis method of a vehicle as in any one of the embodiments described above. Therefore, the method has all the beneficial effects of the dust analysis method of the vehicle in any embodiment.
In the description of the present specification, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified and limited otherwise; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A dust analysis method of a vehicle, comprising:
acquiring a vehicle simulation model and simulation parameters;
determining dust raising parameters of the vehicle simulation model according to the simulation parameters;
determining a target simulation model according to a comparison result of the dust parameters and the dust threshold;
the dust parameter at least comprises wind speed, and the step of determining a target simulation model according to a comparison result of the dust parameter and a dust threshold value specifically comprises the following steps:
if the wind speed is smaller than the wind speed threshold value, the vehicle simulation model is used as the target simulation model;
if the wind speed is greater than or equal to the wind speed threshold value, correcting the vehicle simulation model according to a flow field index;
wherein the flow field indicator comprises at least one of: wind speed index, wind direction index, pressure index;
the dust parameters at least comprise wind speed, particle viscosity and particle quantity, and the target simulation model is determined according to the comparison result of the dust parameters and dust threshold values, and specifically comprises the following steps:
determining cooling parameters of the vehicle simulation model according to the wind speed, the particle viscosity and the particle quantity;
if the cooling parameter meets the cooling threshold range, taking the vehicle simulation model as the target simulation model;
if the cooling parameter exceeds the cooling threshold range, correcting the vehicle simulation model according to a cooling index;
wherein the cooling index comprises at least one of: an air inlet temperature index and a mass flow rate index.
2. The dust analysis method of claim 1, wherein the step of determining the dust parameters of the vehicle simulation model according to the simulation parameters specifically includes:
acquiring a key area of the vehicle simulation model;
and determining dust raising parameters of the key area according to the simulation parameters.
3. The dust analysis method of a vehicle according to claim 2, wherein the step of acquiring a vehicle simulation model specifically includes:
obtaining model parameters;
constructing the vehicle simulation model according to the model parameters;
grid dividing the vehicle simulation model;
and carrying out grid encryption processing on the key area of the vehicle simulation model.
4. A dust analysis method for a vehicle according to claim 3, wherein,
and constructing the vehicle simulation model by adopting computational fluid dynamic simulation.
5. A dust analysis method for a vehicle according to claim 3, wherein,
the grid comprises a tetrahedral grid and/or a hexahedral grid;
the grid is square or rectangular.
6. The dust analysis method of claim 1, further comprising, prior to the step of determining a target simulation model based on a comparison of the dust parameter and a dust threshold range:
acquiring an initial wind speed, a wind speed increment value and a highest wind speed of the vehicle;
collecting the particulate matter concentration of the vehicle, which is adjusted from the initial wind speed to the highest wind speed by taking the wind speed increment value as a step length;
and selecting the first wind speed corresponding to the particle concentration greater than or equal to the particle concentration threshold as the wind speed threshold.
7. A dust analysis device of a vehicle, characterized by comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the dust analysis method of a vehicle according to any one of claims 1 to 6 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the dust analysis method of a vehicle according to any one of claims 1 to 6.
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| CN113111431A (en) * | 2021-03-08 | 2021-07-13 | 东风柳州汽车有限公司 | Simulation evaluation method and device for dust pollution of heavy-duty truck |
| CN115859508B (en) * | 2022-11-23 | 2024-01-02 | 北京百度网讯科技有限公司 | Flow field analysis method, element model generation method, training method and device |
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