CN112668096A - MATLAB-based method for calculating air inlet area of heat management of whole vehicle - Google Patents
MATLAB-based method for calculating air inlet area of heat management of whole vehicle Download PDFInfo
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Abstract
The invention belongs to the technical field of air inlet area calculation of an air inlet of an automobile, and particularly relates to a method for calculating the air inlet area of a heat management system of the whole automobile based on MATLAB; inputting a 3D data model of a CATIA format of a required component into CATIA software, setting a component which shields the front part and influences the air inlet effect of a grating to be black, setting an effective heat dissipation area of a radiator assembly to be white, taking the effective heat dissipation area of the radiator assembly as a boundary, intercepting a picture of a front view of a vehicle, storing the picture in a folder of MATLAB software, calculating the percentage of the area of an opening by using the MATLAB software, and multiplying the percentage by the actual area of a plane of a heat dissipation core to obtain the air inlet area of the radiator assembly; the method is novel, can complete analysis without a large amount of manual operation, and is convenient and quick.
Description
Technical Field
The invention belongs to the technical field of calculation of air inlet areas of automobile air inlets, and particularly relates to a method for calculating the air inlet areas of a whole automobile heat management system based on MATLAB.
Background
For an engine compartment of an automobile, ensuring that the engine compartment has a sufficient heat dissipation effect is one of important conditions for ensuring safe driving of the automobile. From the visual angle, the size of the front grille opening of the automobile can reflect the size of the heat dissipation capacity of the automobile to a certain extent. Therefore, the size of the automobile grille opening needs to be designed and calculated in the automobile thermal management design process, and the size of the ventilation opening of the engine room is ensured to meet the requirements, so that the related performance is achieved.
The existing method for calculating the air inlet area adopts cata software to calculate, and the air inlet of each area needs to be extracted and filled for calculation, so that the time consumption is long, and the efficiency is low.
Disclosure of Invention
In order to overcome the problems, the invention provides a MATLAB-based method for calculating the air inlet area of the whole vehicle thermal management, the calculation and solving efficiency is higher than that of the traditional measuring and calculating mode, the method is novel, the analysis can be completed without a large amount of manual operation, and the method is convenient and quick.
A method for calculating the heat management air inlet area of a whole vehicle based on MATLAB comprises the following steps:
step one, preparing a model
Preparing a 3D data model in a CATIA format according to the design conditions of the whole vehicle, wherein the parts needing to prepare the 3D data model comprise: the system comprises a radiator assembly and components, wherein the front parts of the components shield and influence the grid air inlet effect in a front view of the vehicle, and all 3D data models are assembled into a CATIA file;
step two, pretreatment
According to the setting method of the CATIA software, the 3D data model sets the front part of a component which shields and influences the air inlet effect of the grating to be black, sets the effective heat dissipation area of the radiator assembly to be white, and then adjusts the illumination option conditions in the CATIA software to be as follows: a scattering value of 1, a diffusion value of 0, and an emission value of 0;
step three, picture output
Taking an effective heat dissipation area of the radiator assembly as a boundary, intercepting a vehicle front view picture, and storing the picture as a picture format;
step four, MATLAB solving
Placing the picture saved in the third step and MATLAB software into the same folder, using the MATLAB software to enter a command function according to the following table in sequence, and then clicking a run command to obtain the percentage of the open area in the works space plate, wherein the percentage of the open area is the percentage of the area of the white part in the black part in the picture intercepted in the third step;
step five, calculating the air inlet area of the radiator assembly
And multiplying the opening area percentage obtained in the fourth step by the actual area of the plane of the radiating core body of the radiator assembly to obtain the air inlet area of the radiator assembly.
In the first step, all the front parts in the front view of the vehicle shelter from and influence the air inlet effect of the grille comprise: the front bumper assembly, the front anti-collision beam assembly, the front end frame assembly, the air deflector assembly, the engine hood lock bracket assembly, the air inlet grille assembly, the horn assembly and the mounting bracket; and the integrity of the data of all components including the heat sink assembly is checked.
In the second step, the front bumper assembly, the front anti-collision beam assembly, the front end frame assembly, the air deflector assembly, the engine hood lock bracket assembly, the air inlet grille assembly, the horn assembly and the mounting bracket are set to be black, and the surface of the heat dissipation core body of the radiator assembly is set to be white.
The effective heat dissipation area of the heat sink assembly in the third step is as follows: the radiator core of the radiator assembly is used as a boundary, and a maximum effective radiating plane which is vertical to the radiating and ventilating direction and is formed by a radiator pipe band and fins is formed.
The resolution of the picture intercepted in the third step is required to be that the product of the horizontal and vertical pixel/the actual area of the radiator core body plane is more than or equal to 3.
The invention has the beneficial effects that:
the method has the advantages that the calculation and solving efficiency is higher than that of the traditional measuring and calculating mode, the method is novel, the analysis can be completed without a large amount of manual operation, and the method is convenient and quick.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a flow chart of computational analysis of the present invention;
FIG. 2 is a schematic diagram of 3D data pre-processing;
FIG. 3 is a schematic diagram of a 3D data processing process;
fig. 4 is a diagram of an input map for MATLAB computational analysis, taken in step three.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It is to be further noted that, for the convenience of description, only a part of the structure relating to the present invention is shown in the drawings, not the whole structure.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely means that the first feature is less than the second feature at a horizontal height.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for distinguishing between the foregoing description and not for any special purpose.
The calculation process is shown in fig. 1.
A method for calculating the heat management air inlet area of a whole vehicle based on MATLAB comprises the following steps:
step one, preparing a model
Preparing a 3D data model in a CATIA format according to the design conditions of the whole vehicle, wherein the parts needing to prepare the 3D data model comprise: the system comprises a radiator assembly effective radiating plane, all parts which are shielded and influence the grille air inlet effect at the front parts in a Y axis and a Z axis of a front view of the vehicle, and all 3D data models are assembled into a CATIA file;
step two, pretreatment
Setting the color of a required complete 3D data model according to a setting method of CATIA software, setting a front part shielding part and a part influencing the grille air inlet effect to be black, setting an effective heat dissipation area of a radiator assembly to be white, and adjusting the illumination option conditions in the CATIA software to be as follows: a scattering value of 1, a diffusion value of 0, and an emission value of 0;
step three, picture output
Taking an effective heat dissipation area of the radiator assembly as a boundary, intercepting a vehicle front view picture, ensuring a certain resolution setting, and storing the picture in a picture format;
the model view is adjusted to the YZ plane of the front view of the vehicle, and the length and width of the heat dissipation core are taken as the boundaries of the picture to be cut out, and the picture is taken as the output as shown in fig. 4.
Step four, MATLAB solving
Placing the picture saved in the third step and MATLAB software into the same folder, using the MATLAB software to enter a command function according to the following table 4 in sequence, and then clicking a 'run' command to obtain the percentage of the open area in the works space plate, wherein the percentage of the open area is the percentage of the area of the white part in the picture intercepted in the third step, which accounts for the black part;
the solving principle is as follows: decomposing the picture into a gray scale image, converting the picture into 0/1 tables by color gradation, performing statistical summation on the tables to obtain the percentage of white to black, namely the required open area ratio, and then multiplying the percentage by the actual area of the heat dissipation effective plane of the heat sink.
The computer program to be entered in MATLAB is shown in table 4.
TABLE 4 calculation program
The setting process needs to ensure that the program saving path, the picture path and the program are uniform.
Step five, calculating the air inlet area of the radiator
And multiplying the opening area percentage obtained in the fourth step by the actual area of the plane of the radiating core body of the radiator assembly to obtain the air inlet area of the radiator.
The air inlet area refers to: in the front view of the vehicle (YZ plane), taking into account the sum of the areas of the visible areas of the effective heat dissipation planes of the radiator, after all the frontal screen elements; wherein the opening ratio means: the percentage of the area of the air intake divided by the area of the radiator plane.
Advantages of MATLAB software: the software system integrates programming, calculation and data visualization, and the rich function system of the software system enables developers to finish a plurality of works by simply calling and using without repeated programming.
In the first step, all the front parts in the Y axis and the Z axis of the front view of the vehicle shield and influence the air inlet effect of the grille and comprise: the front bumper assembly, the front anti-collision beam assembly, the front end frame assembly, the air deflector assembly, the engine hood lock bracket assembly, the air inlet grille assembly, the horn assembly and various mounting brackets; and the integrity of the data of all components including the heat sink assembly is checked.
The integrity of the data can be checked with reference to table 1, and the relevant 3D data model is assembled into a CATIA file, not limited to the list of parts, subject to the practical conditions:
TABLE 1 parts identification List
| Serial number | Component part | Integrity validation |
| 1 | Heat radiator | Yes/no |
| 2 | Front bumper assembly | Yes/no |
| 3 | Front anti-collision beam assembly | Yes/no |
| 4 | Front end frame assembly | Yes/no |
| 5 | Air deflector assembly | Yes/no |
| 6 | Engine cover lock bracket assembly | Yes/no |
| 7 | Air inlet grille assembly | Yes/no |
| 8 | Horn assembly | Yes/no |
| 9 | Various mounting brackets | Yes/no |
In the second step, the front bumper assembly, the front anti-collision beam assembly, the front end frame assembly, the air deflector assembly, the engine hood lock bracket assembly, the air inlet grille assembly, the horn assembly and various mounting brackets are set to be black, and the surface of the heat dissipation core body of the radiator assembly is set to be white.
In CATIA software, the color of all shielded parts is changed into pure black, and the surface of the radiator core is changed into pure white
The lighting option conditions and color requirements in the adjusted CATIA software are shown in tables 2 and 3, respectively.
TABLE 2 illumination conditions
| Light source properties | Value of |
| Scattering | 1 |
| Diffusion | 0 |
| Reflection | 0 |
TABLE 3 color attributes
| Colour(s) | Color tone | Degree of saturation | Brightness of light | Red colour | Green colour | Blue color |
| Black color | 0 | 0 | 0 | 0 | 0 | 0 |
| White colour | 0 | 0 | 240 | 255 | 255 | 255 |
The effective heat dissipation area of the heat sink in the third step is as follows: and the maximum effective heat dissipation plane which is perpendicular to the heat dissipation and ventilation direction and is formed by the radiator pipe band and the fins is used as the boundary.
The resolution of the picture cut out in the third step is required to be that the product of the horizontal and vertical pixel/the actual area of the radiator plane is more than or equal to 3.
Solving the precision specification:
the resolution of the picture directly influences the solving precision of the aperture ratio, and the higher the pixel is, the more accurate the result is.
The picture resolution recommendation basis is as follows: the deviation of the calculation result and the actual size is less than or equal to 1 percent. The resolution accuracy of different pixels is shown in table 5.
TABLE 5 Effect of different resolutions on solution accuracy
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the scope of the present invention is not limited to the details of the embodiments, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.
It should be noted that the technical features described in the above embodiments can be combined in any suitable manner without contradiction, and various possible combinations of the features are not described in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (5)
1. A method for calculating the air inlet area of the whole vehicle heat management based on MATLAB is characterized by comprising the following steps:
step one, preparing a model
Preparing a 3D data model in a CATIA format according to the design conditions of the whole vehicle, wherein the parts needing to prepare the 3D data model comprise: the system comprises a radiator assembly and components, wherein all the components are used for shielding the front part of the radiator assembly and influencing the air inlet effect of a grille in a front view of a vehicle, and all 3D data models are assembled into a CATIA file;
step two, pretreatment
According to the setting method of the CATIA software, the 3D data model sets the front part of a component which shields and influences the air inlet effect of the grating to be black, sets the effective heat dissipation area of the radiator assembly to be white, and then adjusts the illumination option conditions in the CATIA software to be as follows: a scattering value of 1, a diffusion value of 0, and an emission value of 0;
step three, picture output
Taking an effective heat dissipation area of the radiator assembly as a boundary, intercepting a vehicle front view picture, and storing the picture as a picture format;
step four, MATLAB solving
Placing the picture saved in the third step and MATLAB software into the same folder, using the MATLAB software to enter a command function according to the following table in sequence, and then clicking a 'run' command to obtain the percentage of an opening area in the works space plate, wherein the percentage of the opening area is the percentage of the area of a white part in a black part in the picture intercepted in the third step;
step five, calculating the air inlet area of the radiator assembly
And multiplying the opening area percentage obtained in the fourth step by the actual area of the plane of the radiating core body of the radiator assembly to obtain the air inlet area of the radiator assembly.
2. The MATLAB-based calculation method for the air inlet area of the whole vehicle thermal management system according to claim 1, wherein in the first step, all the front parts of the front view of the vehicle, which are used for shielding and influencing the air inlet effect of the grille, comprise: the front bumper assembly, the front anti-collision beam assembly, the front end frame assembly, the air deflector assembly, the engine hood lock bracket assembly, the air inlet grille assembly, the horn assembly and the mounting bracket; and the integrity of the data of all components including the heat sink assembly is checked.
3. The MATLAB-based vehicle thermal management air intake area calculation method according to claim 2, wherein in the second step, the front bumper assembly, the front anti-collision beam assembly, the front end frame assembly, the air deflector assembly, the engine hood lock bracket assembly, the air intake grille assembly, the horn assembly and the mounting bracket are set to be black, and the surface of the heat dissipation core of the radiator assembly is set to be white.
4. The MATLAB-based method for calculating the air inlet area of the complete vehicle thermal management system according to claim 3, wherein the effective heat dissipation area of the radiator assembly in the third step is as follows: the radiator core of the radiator assembly is used as a boundary, and a maximum effective radiating plane which is perpendicular to the radiating and ventilating direction and is formed by a radiator pipe band and fins is formed.
5. The MATLAB-based vehicle thermal management air intake area calculation method according to claim 4, wherein the resolution requirement of the picture captured in the third step is that the product of the horizontal and vertical pixel/the actual area of the radiator core body plane is not less than 3.
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