CN103440375B - The method for designing of decorative cover of engine and design system - Google Patents
The method for designing of decorative cover of engine and design system Download PDFInfo
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Abstract
The invention provides a kind of method for designing and design system of decorative cover of engine.The method for designing of decorative cover of engine comprises: utilize the initial placement data of parts in nacelle and the basic parameter of engine bay cooling system to carry out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects; Airflow analysis simulation calculation is carried out to the first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover; Set up the decorative cover of engine model meeting structure and positional parameter boundary condition; Carry out layout respectively to decorative cover of engine model to check and flow field analysis checking; According to the decorative cover of engine model generation decorative cover of engine design proposal by arranging check and flow field analysis checking.By Finite Element Simulation Analysis, air flow method is visual, clear and definite decorative cover of engine design optimization direction targetedly, can abundant assessed for performance.
Description
Technical field
The present invention relates to automotive field, particularly relate to method for designing and the design system of decorative cover of engine.
Background technology
Along with the high speed development of automobile industry, the requirement of people to the security of automobile, comfortableness, environmental protection and energy saving is also more and more higher, vehicle configuration tends to miniaturization gradually, space in nacelle also reduces gradually, cause the layout of parts in cabin very compact, the cabin atmosphere that easy formation is overheated, makes the heat exchange performance of heat dissipation element and the degradation of engine, thus affects the economy of automobile, dynamic property and security.
In automobile engine nacelle, between engine head and cabin cover, be generally furnished with decorative cover of engine, for shielding the noise that engine sends, keep the clean-up performance of engine and visually cover engine and promote the decorative effect in nacelle.Install the degree of difficulty that decorative cover of engine have impact on heat radiation in cabin further on the engine additional.Generally on decorative cover of engine, ventilation slot is offered to ensure cabin proper heat reduction in prior art, and by on-the-spot test in kind, the heat dispersal situations installing decorative cover of engine additional is tested, when test result is undesirable, after needing to modify to the design of decorative cover of engine, repeated test process.Adopt the method for designing of the decorative cover of engine of prior art, radiating effect lacks the foundation of theory calculate, causes the design verification cycle of decorative cover of engine long, and the cost of exploitation and test is higher.
For the problem that the development and Design cycle of decorative cover of engine in prior art is long, in prior art, effective solution is not yet proposed.
Summary of the invention
The object of the invention is the method for designing and the design system that provide a kind of decorative cover of engine, with the problem that the development and Design cycle solving above-mentioned decorative cover of engine is long.
According to one object of the present invention, provide a kind of method for designing of decorative cover of engine, comprise the following steps: steps A, the initial placement data of parts in nacelle and the basic parameter of engine bay cooling system is utilized to carry out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects; Step B, carries out airflow analysis simulation calculation to the first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover; Step C, sets up the decorative cover of engine model meeting structure and positional parameter boundary condition; Step D, carries out layout respectively to decorative cover of engine model and checks and flow field analysis checking; Step e, according to the decorative cover of engine model generation decorative cover of engine design proposal by arranging check and flow field analysis checking.
Further, steps A specifically comprises: steps A 1, obtains the basic parameter of the structured data of parts, the fabrication data of parts and engine bay cooling system; Steps A 2, utilizes structured data and fabrication data to carry out finite element modeling to engine room structure and draws compartment components placement model, and utilizes the parameter of cooling system to carry out finite element modeling to cooling system to draw cooling system model; Steps A 3, combination cabin component layouts model and cooling system model, obtain the first engine room model.
Further, step B specifically comprises: carry out airflow analysis simulation calculation to the first engine room model, draws the Flow Field Distribution of radiating airflow above the intrinsic motivation of cabin; According to the structure of the first engine room model with Flow Field Distribution is constructed and positional parameter boundary condition.More than structure and positional parameter boundary condition specifically comprise: profile arc range, molding surface size scope and rigging position scope.
Further, step C specifically comprises: step C1, and according to the CAS face of boundary condition designed engines Decorative Cover, the CAS face designed is designated as a CAS face; Step C2, carries out finite element modeling to a CAS face, obtains decorative cover of engine model.
Further, step D specifically comprises: combined engine Decorative Cover model and the first engine room model, obtains the second engine room model considering decorative cover of engine impact; Carry out layout to the second cabin flow field model to check, to judge whether decorative cover of engine model meets the arrangement requirement of cabin space; Flow field analysis checking is carried out to the second cabin flow field model, to judge whether decorative cover of engine meets the cooling requirements in cabin.
Further, also comprise after step e: generate the 2nd CAS face according to decorative cover of engine design proposal; According to the 2nd CAS face performance of work design cycle, and export final design scheme.
According to a further aspect in the invention, a kind of design system of decorative cover of engine is additionally provided.
The design system of this decorative cover of engine comprises: the first model building device, basic parameter for the initial placement data and engine bay cooling system that utilize parts in nacelle carries out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects; Model analysis device, for carrying out airflow analysis simulation calculation to the first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover; Second model building device, for setting up the decorative cover of engine model meeting structure and positional parameter boundary condition; Check verification computation device, check and flow field analysis checking for carrying out layout respectively to decorative cover of engine model; Design proposal output unit, for according to by arrange check and flow field analysis verify decorative cover of engine model generation decorative cover of engine design proposal.
Further, the first model building device comprises: data acquisition module, for obtaining the basic parameter of the structured data of parts, the fabrication data of parts and engine bay cooling system; Finite element analysis module, carries out finite element modeling for utilizing structured data and fabrication data to engine room structure and draws compartment components placement model, and utilizes the parameter of cooling system to carry out finite element modeling to cooling system to draw cooling system model; First model group compound module, for combining cabin component layouts model and cooling system model, obtains the first engine room model.
Check verification computation device further specifically to comprise: the second model group compound module, for combined engine Decorative Cover model and the first engine room model, obtain the second engine room model considering decorative cover of engine impact; Arrange and check module, check, to judge whether decorative cover of engine model meets the arrangement requirement of cabin space for carrying out layout to the second cabin flow field model; Flow field authentication module, for carrying out flow field analysis checking to the second cabin flow field model, to judge whether decorative cover of engine meets the cooling requirements in cabin.
Technical scheme of the present invention utilizes finite element simulation technology evaluation decorative cover of engine on the impact of cabin heat radiation, appropriate design decorative cover of engine curved surface and position, make decorative cover of engine be conducive to guiding thermal current, reduce the thermal current eddy current in cabin, reduce the temperature in cabin.And by Finite Element Simulation Analysis, by visual for the air flow method being difficult to obtain in test, clear and definite decorative cover of engine design optimization direction targetedly, can abundant assessed for performance.Thus utilize the powerful analytic function of computer-aided engineering, can the design cycle be shortened, save exploitation and testing expenses.
According to hereafter by reference to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will understand above-mentioned and other objects, advantage and feature of the present invention more.
Accompanying drawing explanation
Hereinafter describe specific embodiments more of the present invention with reference to the accompanying drawings by way of example, and not by way of limitation in detail.Reference numeral identical in accompanying drawing denotes same or similar parts or part.It should be appreciated by those skilled in the art that these accompanying drawings may not be drawn in proportion.In accompanying drawing:
Fig. 1 is the schematic diagram of the design system of decorative cover of engine according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the method for designing of decorative cover of engine according to the embodiment of the present invention; And
Fig. 3 is the process flow diagram of the method for designing of use decorative cover of engine according to the embodiment of the present invention.
Embodiment
Fig. 1 is the schematic diagram of the design system of decorative cover of engine according to the embodiment of the present invention.This design system can comprise in general manner: the first model building device 11, model analysis device 12, second model building device 13, check verification computation device 14, design proposal output unit 15.Wherein, the first model building device 11, the basic parameter for the initial placement data and engine bay cooling system that utilize parts in nacelle carries out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects; Model analysis device 12, for carrying out airflow analysis simulation calculation to described first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover; Second model building device 13, for setting up the decorative cover of engine model meeting described structure and positional parameter boundary condition; Check verification computation device 14, check and flow field analysis checking for carrying out layout respectively to described decorative cover of engine model; Design proposal output unit 15, for arranging according to by described the described decorative cover of engine model generation decorative cover of engine design proposal that check and described flow field analysis are verified.
Above first model building device 11 specifically can comprise: data acquisition module 111, finite element analysis module 112, first model group compound module 113, wherein, data acquisition module 111 is for obtaining the basic parameter of the structured data of each parts in cabin, the fabrication data of parts and engine bay cooling system; Finite element analysis module 112, carries out finite element modeling for utilizing structured data and fabrication data to engine room structure and draws compartment components placement model, and utilizes the parameter of cooling system to carry out finite element modeling to cooling system to draw cooling system model; First model group compound module 113, for combining cabin component layouts model and cooling system model, obtains the first engine room model.
Fabrication data in above cabin between the structured data of each parts and each parts all directly can import from vehicle CAD system basic data, the basic parameter of engine bay cooling system comprises cabin inner radiator assembly parameter, condenser assembly parameter, cooling fan assembly parameter, and flow resistance etc. in cabin.During due to engine running, the part contacted with high-temperature fuel gas is subject to strong heating, as in addition unsuitable cooling, engine overheat can be made, gassing factor declines, and burns abnormal, and machine oil goes bad and scaling loss, the friction and wear aggravation of part, causes dynamic property, economy, reliability and permanance to worsen comprehensively.If but by force cooled, gasoline engine mixed Daqu is bad, the burned dilution of machine oil, and diesel engine work is slightly quick-fried, and radiation loss and friction loss increase, and the wearing and tearing aggravation of part, also can make working environment worsen and degenerate.Therefore, the main task of cooling system is under ensureing to remain on suitable state of temperature in cabin.Therefore, the basis that engine decorative covers on original aircraft compartment interiors is assembled, needs to take into full account the initial placement data of original parts in cabin, and the impact on cabin heat radiation.
Finite element analysis module 112, give full play to forerunner's property effect of finite element simulation technology, establish the finite element model that can carry out flow field analysis, through the Model Mounting of the first model group compound module 113, obtain and do not assembling the engine room model in decorative cover of engine situation, namely the first engine room model.After above first engine room model has combined, can adjust according to practical structures data, such as the part of constructive interference be modified, the grid etc. of adjustment finite element.
The specific works flow process of model analysis device 12 can be: carry out airflow analysis simulation calculation to the first engine room model, draw the Flow Field Distribution of radiating airflow above the intrinsic motivation of cabin; According to the structure of the first engine room model with Flow Field Distribution is constructed and positional parameter boundary condition.Utilize the result of calculation of above Flow Field Distribution by visual for the air flow method being difficult to obtain in test.More than structure and positional parameter boundary condition specifically can comprise: profile arc range, molding surface size scope and rigging position scope.
After the structure obtaining above decorative cover of engine design proposal and positional parameter boundary condition, the second model building device 13 can be inputted, in conjunction with the moulding CAS obtained by shape-designing, generate the model of decorative cover of engine.Moulding CAS face is the abbreviation of ComputerAddedStyling, namely according to the face that design sketch creates out.CAS face is exactly after drawing moulding design sketch in early stage, a preliminary three-dimensional modeling curved surface is done out by three-dimensional software, in the inventive solutions, the CAS face meeting above structure and positional parameter boundary condition is designated as a CAS face, and finite element modeling is carried out to a CAS face, decorative cover of engine model can be obtained.
Check verification computation device 14 to evaluate and optimize the modeling result of the second model building device 13, particularly, check verification computation device 14 and specifically comprise: the second model group compound module 141, layout check module 142 and flow field authentication module 143.
Wherein, the second model group compound module 141, for combined engine Decorative Cover model and the first engine room model, obtains the second engine room model considering decorative cover of engine impact; Arrange and check module 142, check, to judge whether decorative cover of engine model meets the arrangement requirement of cabin space for carrying out layout to the second cabin flow field model; Flow field authentication module 143, for carrying out flow field analysis checking to the second cabin flow field model, to judge whether decorative cover of engine meets the cooling requirements in cabin, ensure that the thermal current in cabin can flow to rear, cabin smoothly along decorative cover of engine, finally flow out cabin along front wall.
Through checking evaluating and optimizing of verification computation device 14, the decorative cover of engine design proposal by arranging check and flow field analysis checking can be obtained.Utilize the program can generate the 2nd CAS face; According to the 2nd CAS face performance of work design cycle, just can export final design scheme, thus be met the decorative cover of engine scheme of flow field, cabin needs.
The design system of the decorative cover of engine of the present embodiment, utilize finite element simulation technology evaluation decorative cover of engine on the impact of cabin heat radiation, appropriate design decorative cover of engine curved surface and position, decorative cover of engine is made to be conducive to guiding thermal current, reduce the thermal current eddy current in cabin, reduce the temperature in cabin.And by Finite Element Simulation Analysis, by visual for the air flow method being difficult to obtain in test, clear and definite decorative cover of engine design optimization direction targetedly, can abundant assessed for performance.Thus utilize the powerful analytic function of computer-aided engineering, can the design cycle be shortened, save exploitation and testing expenses.
Embodiments of the invention additionally provide a kind of method for designing of decorative cover of engine, and this method for designing can be performed by the design system of the above decorative cover of engine introduced.
Fig. 2 is the schematic diagram of the method for designing of decorative cover of engine according to the embodiment of the present invention, and as shown in the figure, the method for designing of this decorative cover of engine comprises the following steps:
Steps A, utilizes the initial placement data of parts in nacelle and the basic parameter of engine bay cooling system to carry out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects;
Step B, carries out airflow analysis simulation calculation to the first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover;
Step C, sets up the decorative cover of engine model meeting structure and positional parameter boundary condition;
Step D, carries out layout respectively to decorative cover of engine model and checks and flow field analysis checking;
Step e, according to the decorative cover of engine model generation decorative cover of engine design proposal by arranging check and flow field analysis checking.
In method for designing below to the decorative cover of engine of the embodiment of the present invention, the idiographic flow of each step is introduced.Above steps A can specifically comprise:
Steps A 1, obtains the basic parameter of the structured data of parts, the fabrication data of parts and engine bay cooling system;
Steps A 2, utilizes structured data and fabrication data to carry out finite element modeling to engine room structure and draws compartment components placement model, and utilizes the parameter of cooling system to carry out finite element modeling to cooling system to draw cooling system model;
Steps A 3, combination cabin component layouts model and cooling system model, obtain the first engine room model.
Above step B specifically comprises: carry out airflow analysis simulation calculation to the first engine room model, draws the Flow Field Distribution of radiating airflow above the intrinsic motivation of cabin; According to the structure of the first engine room model with Flow Field Distribution is constructed and positional parameter boundary condition.More than structure and positional parameter boundary condition specifically comprise: profile arc range, molding surface size scope and rigging position scope.
Above step C specifically comprises: step C1, and according to the CAS face of boundary condition designed engines Decorative Cover, the CAS face designed is designated as a CAS face; Step C2, carries out finite element modeling to a CAS face, obtains decorative cover of engine model.
Above step D specifically comprises: combined engine Decorative Cover model and the first engine room model, obtains the second engine room model considering decorative cover of engine impact; Carry out layout to the second cabin flow field model to check, to judge whether decorative cover of engine model meets the arrangement requirement of cabin space; Flow field analysis checking is carried out to the second cabin flow field model, to judge whether decorative cover of engine meets the cooling requirements in cabin.
And also comprise after step e: generate the 2nd CAS face according to decorative cover of engine design proposal; According to the 2nd CAS face performance of work design cycle, and export final design scheme.Through the flow process of engineering design, can design detailed parts, obtain final CAD and export.
Fig. 3 is the process flow diagram of the method for designing of use decorative cover of engine according to the embodiment of the present invention, as shown in the figure, the design cycle of decorative cover of engine is divided into three parts: finite element model establishing stage 31, the flow field analysis stage 32 not with decorative cover of engine, the decorative cover of engine design phase 33 based on cabin flow field simulation.In finite element model establishing stage 31, obtain structure and the fabrication data of cabin parts, and obtain the basic parameter of cooling system by importing CAD drawing, sub-module creates cabin finite element model, for carrying out cabin flow field analysis preparation.Not with in the flow field analysis stage 32 of decorative cover of engine, carry out cabin flow field simulation computational analysis, selective analysis through heat dissipation element air-flow on the engine side mobility status, for the design of decorative cover of engine provides boundary condition, provide the profile radian of decorative cover of engine, size and position suggestion, enable the thermal current in cabin flow to rear, cabin smoothly along decorative cover of engine, finally flow out cabin along front wall.Based in the decorative cover of engine design phase 33 of cabin flow field simulation, the border of decorative cover of engine is obtained according to cabin flow field analysis, check in conjunction with moulding CAS face and layout gap, decorative cover of engine is optimized and flow field simulation checking, decorative cover of engine is enable to meet the demand of cabin heat management, then as the input of engineering design, detailed parts design is carried out.
Above flow process utilizes finite element simulation technology evaluation decorative cover of engine on the impact of cabin heat radiation, appropriate design decorative cover of engine curved surface and position, make decorative cover of engine be conducive to guiding thermal current, reduce the thermal current eddy current in cabin, reduce the temperature in cabin.And by Finite Element Simulation Analysis, by visual for the air flow method being difficult to obtain in test, clear and definite decorative cover of engine design optimization direction targetedly, can abundant assessed for performance.Thus utilize the powerful analytic function of computer-aided engineering, can the design cycle be shortened, save exploitation and testing expenses.
So far, those skilled in the art will recognize that, although multiple exemplary embodiment of the present invention is illustrate and described herein detailed, but, without departing from the spirit and scope of the present invention, still can directly determine or derive other modification many or amendment of meeting the principle of the invention according to content disclosed by the invention.Therefore, scope of the present invention should be understood and regard as and cover all these other modification or amendments.
Claims (9)
1. a method for designing for decorative cover of engine, comprises the following steps:
Steps A, utilizes the initial placement data of parts in nacelle and the basic parameter of engine bay cooling system to carry out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects;
Step B, carries out airflow analysis simulation calculation to described first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover; Wherein, described structure and positional parameter boundary condition comprise: profile arc range, molding surface size scope and rigging position scope;
Step C, sets up the decorative cover of engine model meeting described structure and positional parameter boundary condition;
Step D, carries out layout respectively to described decorative cover of engine model and checks and flow field analysis checking;
Step e, arranges according to by described the described decorative cover of engine model generation decorative cover of engine design proposal that check and described flow field analysis are verified.
2. method for designing according to claim 1, wherein, described steps A comprises:
Steps A 1, obtains the structured data of described parts, the fabrication data of described parts and the basic parameter of described engine bay cooling system;
Steps A 2, utilizes described structured data and described fabrication data to carry out finite element modeling to engine room structure and draws compartment components placement model, and utilizes the parameter of described cooling system to carry out finite element modeling to described cooling system to draw cooling system model;
Steps A 3, combines described compartment components placement model and cooling system model, obtains described first engine room model.
3. method for designing according to claim 1, wherein, described step B comprises:
Airflow analysis simulation calculation is carried out to described first engine room model, draws the Flow Field Distribution of radiating airflow above the intrinsic motivation of cabin;
Described structure and positional parameter boundary condition is obtained according to the structure of described first engine room model and described Flow Field Distribution.
4. method for designing according to claim 1, wherein, described step C comprises:
Step C1, according to the CAS face of described boundary condition designed engines Decorative Cover, the CAS face designed is designated as a CAS face;
Step C2, carries out finite element modeling to a described CAS face, obtains described decorative cover of engine model.
5. method for designing according to any one of claim 1 to 4, wherein, described step D comprises:
Combine described decorative cover of engine model and described first engine room model, obtain the second engine room model considering decorative cover of engine impact;
Carry out described layout to described second cabin flow field model to check, to judge whether described decorative cover of engine model meets the arrangement requirement of cabin space;
Described flow field analysis checking is carried out to described second cabin flow field model, to judge whether described decorative cover of engine meets the cooling requirements in cabin.
6. method for designing according to any one of claim 1 to 4, is characterized in that, also comprises after described step e:
The 2nd CAS face is generated according to described decorative cover of engine design proposal;
According to described 2nd CAS face performance of work design cycle, and export final design scheme.
7. a design system for decorative cover of engine, comprising:
First model building device, the basic parameter for the initial placement data and engine bay cooling system that utilize parts in nacelle carries out finite element modeling to nacelle, not considered the first engine room model that decorative cover of engine affects;
Model analysis device, for carrying out airflow analysis simulation calculation to described first engine room model, obtains structure and the positional parameter boundary condition of designed engines Decorative Cover; Wherein, described structure and positional parameter boundary condition comprise: profile arc range, molding surface size scope and rigging position scope;
Second model building device, for setting up the decorative cover of engine model meeting described structure and positional parameter boundary condition;
Check verification computation device, check and flow field analysis checking for carrying out layout respectively to described decorative cover of engine model;
Design proposal output unit, for arranging according to by described the described decorative cover of engine model generation decorative cover of engine design proposal that check and described flow field analysis are verified.
8. design system according to claim 7, wherein, described first model building device comprises:
Data acquisition module, for obtaining the basic parameter of the structured data of described parts, the fabrication data of described parts and described engine bay cooling system;
Finite element analysis module, for utilizing described structured data and described fabrication data, finite element modeling is carried out to engine room structure and draw compartment components placement model, and utilize the parameter of described cooling system to carry out finite element modeling to described cooling system to draw cooling system model;
First model group compound module, for combining described compartment components placement model and cooling system model, obtains described first engine room model.
9. the design system according to claim 7 or 8, wherein, described check verification computation device comprises:
Second model group compound module, for combining described decorative cover of engine model and described first engine room model, obtains the second engine room model considering decorative cover of engine impact;
Arrange and check module, check, to judge whether described decorative cover of engine model meets the arrangement requirement of cabin space for carrying out described layout to described second cabin flow field model;
Flow field authentication module, for carrying out described flow field analysis checking to described second cabin flow field model, to judge whether described decorative cover of engine meets the cooling requirements in cabin.
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| CN106891781B (en) * | 2017-03-03 | 2018-06-12 | 武汉理工大学 | A kind of automotive seat intelligentized design system and method |
| CN111985049A (en) * | 2020-08-04 | 2020-11-24 | 奇瑞商用车（安徽）有限公司 | Visual aesthetic property checking method for inner plate of automobile hood |
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