CN104915490A - Method and device for pneumatically anti-designing motor train unit head type - Google Patents
Method and device for pneumatically anti-designing motor train unit head type Download PDFInfo
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- CN104915490A CN104915490A CN201510296137.0A CN201510296137A CN104915490A CN 104915490 A CN104915490 A CN 104915490A CN 201510296137 A CN201510296137 A CN 201510296137A CN 104915490 A CN104915490 A CN 104915490A
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Abstract
The invention provides a method and a device for pneumatically anti-designing a motor train unit head type. The method comprises the following steps: determining anti-design indexes and constraint conditions; performing parametric design on the three-dimensional geometric shape of the motor train unit head type to determine a design space; obtaining multiple groups of design variables required by training sample points; performing numerical simulation on the motor train unit head type corresponding to the design variables to obtain pneumatic indexes of the motor train unit head type and complete a training sample point set; constructing a support vector machine model; searching the design variables meeting the anti-design indexes and constraint conditions in the design space according to the support vector machine model; verifying the motor train unit head type corresponding to the searched design variables, judging whether the errors of the pneumatic indexes and the anti-design indexes of the motor train unit head type corresponding to the design variables meets design requirements, and if yes, the motor train unit head type corresponding to the group of design variables is an anti-design shape. According to the method and the device, the blindness when the head type is designed is reduced, and the engineering design efficiency and pertinency of the motor train unit head type are improved.
Description
Technical field
The present invention relates to motor-car design field, be specifically related to a kind of motor train unit head dummy Aerodynamic Inverse Design method and device.
Background technology
Motor train unit head configuration is very large on the impact of aerodynamic performance of train, the aeroperformance of motor train unit effectively can be improved by improving head dummy, head dummy design is motor train unit development and one of gordian technique developed, and each motor train unit designing unit all pays much attention to research and development and the design of head dummy.
The essence of head dummy design is geometric shape reasonable in design, and the Pneumatic design method of geometric shape mainly contains the method for designing of preferred formula, Optimization Design and mimetic design method.Engineering design method the most ripe is the method for designing of preferred formula, namely some head dummys are gone out according to existing Experience Design, then be analyzed by numerical simulation, wind tunnel test and the aeroperformance of real train test method to each head dummy, thus choose the good head dummy of aeroperformance, the method tool bears the character of much blindness, and the design cycle is long, cost is high, and the aeroperformance of the head dummy obtained often also has very large room for promotion.
Although the optimal design research of motor train unit head dummy has made great progress, but still be difficult to well be applied to problems of engineering design.
Summary of the invention
For defect of the prior art, the invention provides a kind of motor train unit head dummy Aerodynamic Inverse Design method and device, blindness during head dummy design can be reduced, improve efficiency and the specific aim of motor train unit head dummy engineering design.
For solving the problems of the technologies described above, the invention provides following technical scheme:
First aspect, the invention provides a kind of motor train unit head dummy Aerodynamic Inverse Design method, comprising:
S1. mimetic design index and/or the constraint condition of motor train unit head dummy Aerodynamic Inverse Design is determined;
S2. Parametric designing is carried out to the three-dimensional geometry profile of motor train unit head dummy, extract design variable, and determine design space;
S3. in described design space, sample the many groups design variable obtaining training sample point needs, wherein often organize the corresponding a motor train unit head dummy of design variable;
S4. numerical simulation is carried out to the motor train unit head dummy often organizing design variable corresponding, often organized the pneumatic index of motor train unit head dummy corresponding to design variable, complete training sample point set;
S5. build supporting vector machine model based on described training sample point set, obtain the Implicitly function relation of design variable and pneumatic index;
S6. according to described supporting vector machine model, in design space, search meets the design variable of described mimetic design index and/or constraint condition;
S7. corresponding to the design variable searched motor train unit head dummy is verified, judge whether the pneumatic index of the motor train unit head dummy that design variable is corresponding and the error of described mimetic design index are less than the error threshold preset, if so, the motor train unit head dummy that then this group design variable is corresponding is mimetic design profile.
Wherein, if the error of the pneumatic index of the motor train unit head dummy that this group design variable is corresponding and described mimetic design index is more than or equal to the error threshold preset, then this group design variable is added training sample point set, go to step S5, until error meets the error threshold preset.
Wherein, according to described supporting vector machine model, utilize particle cluster algorithm in design space, search for the design variable meeting described mimetic design index.
Wherein, Computational Fluid Dynamics numerical simulation is carried out to the motor train unit head dummy often organizing design variable corresponding, obtains the pneumatic index that each motor train unit head dummy is corresponding, complete training sample point set.
Wherein, corresponding to the design variable searched motor train unit head dummy carries out Computational Fluid Dynamics checking.
Wherein, described constraint condition comprises geometry constraint conditions and/or pneumatic Index Constraints condition.
Wherein, describedly determine that design space comprises the span determining each design variable.
Second aspect, the invention provides a kind of motor train unit head dummy Aerodynamic Inverse Design device, comprising:
Mimetic design index determining unit, for determining mimetic design index and/or the constraint condition of motor train unit head dummy Aerodynamic Inverse Design;
Design space forming unit, for carrying out Parametric designing to the three-dimensional geometry profile of motor train unit head dummy, extracting design variable, and determining design space;
Sampling unit, for sampling the many groups design variable obtaining training sample point needs in described design space, wherein often organizes the corresponding a motor train unit head dummy of design variable;
Numerical simulation unit, for carrying out numerical simulation to the motor train unit head dummy often organizing design variable corresponding, often being organized the pneumatic index of motor train unit head dummy corresponding to design variable, being completed training sample point set;
Supporting vector machine model construction unit, for building supporting vector machine model based on described training sample point set, obtains the Implicitly function relation of design variable and pneumatic index;
Search unit, for according to described supporting vector machine model, searches for the design variable meeting described mimetic design index and/or constraint condition in design space;
Authentication unit, verifies for the motor train unit head dummy corresponding to the design variable searched, and judges whether the pneumatic index of the motor train unit head dummy that design variable is corresponding and the error of described mimetic design index are less than the error threshold preset;
Result output unit, when error for the pneumatic index and described mimetic design index of determining the motor train unit head dummy that described design variable is corresponding at described authentication unit is less than the error threshold preset, motor train unit head dummy corresponding for this group design variable is exported as motor train unit head dummy mimetic design result.
Wherein, described motor train unit head dummy Aerodynamic Inverse Design device also comprises feedback unit; Described feedback unit is used for when described authentication unit determines the pneumatic index of the motor train unit head dummy that described design variable is corresponding and the error of described mimetic design index is more than or equal to the error threshold preset, and described design variable is joined described training sample point and concentrates.
Wherein, described search unit is used for according to described supporting vector machine model, utilizes particle cluster algorithm in design space, search for the design variable meeting described mimetic design index
As shown from the above technical solution, the present invention is based on Support vector regression model, devise a kind of motor train unit head dummy Aerodynamic Inverse Design method, the method needs mimetic design index and the constraint condition of first determining motor train unit head dummy Aerodynamic Inverse Design, and then Parametric designing is carried out to the three-dimensional geometry profile of motor train unit head dummy, extract design variable, determine design space.Then, sampling formation is carried out to described design space and organizes design variable more, numerical simulation is carried out to the motor train unit head dummy often organizing design variable corresponding, is often organized the pneumatic index of motor train unit head dummy corresponding to design variable, complete training sample point set.Then, supporting vector machine model is built based on described training sample point set, according to described supporting vector machine model, in design space, search meets the design variable of described mimetic design index and/or constraint condition, the motor train unit head dummy corresponding to the design variable searched is verified, when the pneumatic index of motor train unit head dummy corresponding to design variable and the error of described mimetic design index are less than the error threshold preset, determine that the motor train unit head dummy that this group design variable is corresponding is mimetic design profile, thus complete the mimetic design of motor train unit head dummy.Aerodynamic Inverse Design method of the present invention can be met the motor train unit head dummy of design objective and constraint condition fast, is conducive to the efficiency and the specific aim that improve the engineering design of motor train unit head dummy.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of the motor train unit head dummy Aerodynamic Inverse Design method that one embodiment of the invention provides;
The simple process figure of the motor train unit head dummy Aerodynamic Inverse Design method that Fig. 2 one embodiment of the invention provides;
Fig. 3 is the mimetic design appearance schematic diagram of obtain under single goal unconfined condition one group of motor train unit head dummy that one embodiment of the invention provides;
Fig. 4 is the mimetic design appearance schematic diagram of obtain under single goal Prescribed Properties one group of motor train unit head dummy that one embodiment of the invention provides;
Fig. 5 is the mimetic design appearance schematic diagram of obtain under multiple goal unconfined condition one group of motor train unit head dummy that one embodiment of the invention provides;
Fig. 6 is the structural representation of the motor train unit head dummy Aerodynamic Inverse Design device that another embodiment of the present invention provides;
Fig. 7 is the structural representation of the motor train unit head dummy Aerodynamic Inverse Design device that a preferred embodiment of the invention provides.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 shows the process flow diagram of the motor train unit head dummy Aerodynamic Inverse Design method that one embodiment of the invention provides, and see Fig. 1, the motor train unit head dummy Aerodynamic Inverse Design method that the present embodiment provides comprises the steps:
Step 101: mimetic design index and/or the constraint condition of determining motor train unit head dummy Aerodynamic Inverse Design.
In this step, first-selection needs mimetic design index and/or the constraint condition of determining motor train unit head dummy Aerodynamic Inverse Design, and wherein constraint condition comprises geometry constraint conditions and/or pneumatic Index Constraints condition.Such as, determine that car load pneumatic drag coefficient (value is 0.3) is design objective, fairing section volume (being not less than 0.027) is constraint condition.
Step 102: carry out Parametric designing to the three-dimensional geometry profile of motor train unit head dummy, extracts design variable, and determines design space.
In this step, describedly determine that design space comprises the span determining each design variable.
Step 103: sample the many groups design variable obtaining training sample point needs in described design space, wherein often organizes the corresponding a motor train unit head dummy of design variable.
Step 104: numerical simulation is carried out to the motor train unit head dummy often organizing design variable corresponding, is often organized the pneumatic index of motor train unit head dummy corresponding to design variable, complete training sample point set.
In this step, Computational Fluid Dynamics numerical simulation is carried out to the motor train unit head dummy often organizing design variable corresponding, obtains the pneumatic index that each motor train unit head dummy is corresponding, complete training sample point set.
Step 105: build supporting vector machine model based on described training sample point set, obtain the Implicitly function relation of design variable and pneumatic index.
Step 106: according to described supporting vector machine model, in design space, search meets the design variable of described mimetic design index and/or constraint condition.
At this in step, according to described supporting vector machine model, utilize particle cluster algorithm in design space, search for the design variable meeting described mimetic design index.
Step 107: the motor train unit head dummy corresponding to the design variable searched is verified, judge whether the pneumatic index of the motor train unit head dummy that design variable is corresponding and the error of described mimetic design index are less than the error threshold preset, if so, the motor train unit head dummy that then this group design variable is corresponding is mimetic design profile.
At this in step, the motor train unit head dummy corresponding to the design variable searched carries out Computational Fluid Dynamics checking, judge whether the pneumatic index of the motor train unit head dummy that this group design variable is corresponding and the error of described mimetic design index are less than the error threshold preset, if so, the motor train unit head dummy that then this group design variable is corresponding is mimetic design profile.
If the error of the pneumatic index of the motor train unit head dummy that this group design variable is corresponding and described mimetic design index is more than or equal to the error threshold preset, then this group design variable is added training sample point set, go to step 105, until error meets the error threshold preset.In addition, the simple process figure that the flow process of above-mentioned steps also can be shown in Figure 2.
Wherein, in head dummy pneumatic design process, concern be the synthetic aerodynamic performance of head dummy, do not pursue the optimum of a certain pneumatic index of head dummy in a lot of situation, but wish the head dummy being met a certain given pneumatic force value, above-mentioned Aerodynamic Inverse Design method can be good at reaching this purpose.
The mimetic design profile result adopting the motor train unit head dummy that method obtains described in the present embodiment is introduced below with several concrete example.
A. single goal is without the one group of mimetic design profile obtained during constraint
See Fig. 3, for the marshaling of three different models, with car load pneumatic drag coefficient (value is for 0.3) for design objective, obtain three sections of mimetic design profiles.
B. the one group of mimetic design profile obtained during single goal Constrained
See Fig. 4, for the marshaling of three different models, with car load pneumatic drag coefficient (value is for 0.3) for design objective, three sections of mimetic design profiles that fairing section volume (being not less than 0.027) obtains for constraint condition.
C. multiple goal is without the one group of mimetic design profile obtained during constraint
See Fig. 5, for the marshaling of three different models, the three sections of mimetic design profiles obtained for design objective with car load pneumatic drag coefficient (value is for 0.294) and fairing section volume (value is for 0.0254).
The present embodiment, based on Support vector regression model, devises a kind of motor train unit head dummy Aerodynamic Inverse Design method; For reducing Flow Field Calculation number of times during numerical simulation, first corresponding response surface model (the Implicitly function relation of design variable and pneumatic index) is set up respectively for mimetic design index and constraint condition, then in design space, the mimetic design profile meeting design object value and constraint condition is found by particle swarm optimization algorithm, be conducive to blindness when reducing the design of motor train unit head dummy, improve efficiency and the specific aim of the engineering design of motor train unit head dummy
The Aerodynamic Inverse Design method of the present embodiment design can be met the head dummy of specifying constraint and pneumatic design objective fast, can be applied to engineering problem, avoid the blindness of preferred formula method for designing.Namely the Aerodynamic Inverse Design method of the present embodiment design is conducive to the efficiency and the specific aim that improve the engineering design of motor train unit head dummy.
In addition, there is not any hypothesis in the Aerodynamic Inverse Design method of the present embodiment design, is easy to multiple goal, the Constrained Aerodynamic Inverse Design method expanded as solving any complex geometry profile and pressure distribution.
In addition, numerical simulation result can also be saved as database by the Aerodynamic Inverse Design method of the present embodiment design, in the design process of new head dummy, constantly can upgrade this database, save computational resource, and enriching constantly along with data-base content, the efficiency of head dummy Aerodynamic Inverse Design and specific aim can progressively strengthen.
Fig. 6 shows the structural representation of the motor train unit head dummy Aerodynamic Inverse Design device that another embodiment of the present invention provides, and see Fig. 6, the motor train unit head dummy Aerodynamic Inverse Design device that the present embodiment provides comprises:
Mimetic design index determining unit 61, for determining mimetic design index and/or the constraint condition of motor train unit head dummy Aerodynamic Inverse Design;
Design space forming unit 62, for carrying out Parametric designing to the three-dimensional geometry profile of motor train unit head dummy, extracting design variable, and determining design space;
Sampling unit 63, for sampling the many groups design variable obtaining training sample point needs in described design space, wherein often organizes the corresponding a motor train unit head dummy of design variable;
Numerical simulation unit 64, for carrying out numerical simulation to the motor train unit head dummy often organizing design variable corresponding, often being organized the pneumatic index of motor train unit head dummy corresponding to design variable, being completed training sample point set;
Supporting vector machine model construction unit 65, for building supporting vector machine model based on described training sample point set, obtains the Implicitly function relation of design variable and pneumatic index;
Search unit 66, for according to described supporting vector machine model, searches for the design variable meeting described mimetic design index and/or constraint condition in design space;
Authentication unit 67, verifies for the motor train unit head dummy corresponding to the design variable searched, and judges whether the pneumatic index of the motor train unit head dummy that design variable is corresponding and the error of described mimetic design index are less than the error threshold preset;
Result output unit 68, when error for the pneumatic index and described mimetic design index of determining the motor train unit head dummy that described design variable is corresponding at described authentication unit is less than the error threshold preset, motor train unit head dummy corresponding for this group design variable is exported as motor train unit head dummy mimetic design result.
In a preferred embodiment of the invention, see Fig. 7, described motor train unit head dummy Aerodynamic Inverse Design device also comprises feedback unit 69; When described feedback unit 69 is for determining that at described authentication unit 68 the pneumatic index of the motor train unit head dummy that described design variable is corresponding and the error of described mimetic design index are more than or equal to the error threshold preset, described design variable is joined described training sample point and concentrating.
Wherein, described search unit 66, for according to described supporting vector machine model, utilizes particle cluster algorithm in design space, search for the design variable meeting described mimetic design index.
Motor train unit head dummy Aerodynamic Inverse Design device described in the present embodiment may be used for the motor train unit head dummy Aerodynamic Inverse Design method described in above-described embodiment of performing, its principle and technique effect similar, no longer describe in detail herein.
Above embodiment only for illustration of technical scheme of the present invention, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a motor train unit head dummy Aerodynamic Inverse Design method, is characterized in that, comprising:
S1. mimetic design index and/or the constraint condition of motor train unit head dummy Aerodynamic Inverse Design is determined;
S2. Parametric designing is carried out to the three-dimensional geometry profile of motor train unit head dummy, extract design variable, and determine design space;
S3. in described design space, sample the many groups design variable obtaining training sample point needs, wherein often organize the corresponding a motor train unit head dummy of design variable;
S4. numerical simulation is carried out to the motor train unit head dummy often organizing design variable corresponding, often organized the pneumatic index of motor train unit head dummy corresponding to design variable, complete training sample point set;
S5. build supporting vector machine model based on described training sample point set, obtain the Implicitly function relation of design variable and pneumatic index;
S6. according to described supporting vector machine model, in design space, search meets the design variable of described mimetic design index and/or constraint condition;
S7. corresponding to the design variable searched motor train unit head dummy is verified, judge whether the pneumatic index of the motor train unit head dummy that design variable is corresponding and the error of described mimetic design index are less than the error threshold preset, if so, the motor train unit head dummy that then this group design variable is corresponding is mimetic design profile.
2. method according to claim 1, it is characterized in that, if the error of the pneumatic index of the motor train unit head dummy that this group design variable is corresponding and described mimetic design index is more than or equal to the error threshold preset, then this group design variable is added training sample point set, go to step S5, until error meets the error threshold preset.
3. method according to claim 1, is characterized in that, according to described supporting vector machine model, utilizes particle cluster algorithm in design space, search for the design variable meeting described mimetic design index.
4. method according to claim 1, is characterized in that, carries out Computational Fluid Dynamics numerical simulation, obtain the pneumatic index that each motor train unit head dummy is corresponding, complete training sample point set the motor train unit head dummy often organizing design variable corresponding.
5. method according to claim 1, is characterized in that, the motor train unit head dummy corresponding to the design variable searched carries out Computational Fluid Dynamics checking.
6. method according to claim 1, is characterized in that, described constraint condition comprises geometry constraint conditions and/or pneumatic Index Constraints condition.
7. method according to claim 1, is characterized in that, describedly determines that design space comprises the span determining each design variable.
8. a motor train unit head dummy Aerodynamic Inverse Design device, is characterized in that, comprising:
Mimetic design index determining unit, for determining mimetic design index and/or the constraint condition of motor train unit head dummy Aerodynamic Inverse Design;
Design space forming unit, for carrying out Parametric designing to the three-dimensional geometry profile of motor train unit head dummy, extracting design variable, and determining design space;
Sampling unit, for sampling the many groups design variable obtaining training sample point needs in described design space, wherein often organizes the corresponding a motor train unit head dummy of design variable;
Numerical simulation unit, for carrying out numerical simulation to the motor train unit head dummy often organizing design variable corresponding, often being organized the pneumatic index of motor train unit head dummy corresponding to design variable, being completed training sample point set;
Supporting vector machine model construction unit, for building supporting vector machine model based on described training sample point set, obtains the Implicitly function relation of design variable and pneumatic index;
Search unit, for according to described supporting vector machine model, searches for the design variable meeting described mimetic design index and/or constraint condition in design space;
Authentication unit, verifies for the motor train unit head dummy corresponding to the design variable searched, and judges whether the pneumatic index of the motor train unit head dummy that design variable is corresponding and the error of described mimetic design index are less than the error threshold preset;
Result output unit, when error for the pneumatic index and described mimetic design index of determining the motor train unit head dummy that described design variable is corresponding at described authentication unit is less than the error threshold preset, motor train unit head dummy corresponding for this group design variable is exported as motor train unit head dummy mimetic design result.
9. motor train unit head dummy Aerodynamic Inverse Design device according to claim 8, is characterized in that, also comprise feedback unit; Described feedback unit is used for when described authentication unit determines the pneumatic index of the motor train unit head dummy that described design variable is corresponding and the error of described mimetic design index is more than or equal to the error threshold preset, and described design variable is joined described training sample point and concentrates.
10. motor train unit head dummy Aerodynamic Inverse Design device according to claim 8, is characterized in that, described search unit is used for according to described supporting vector machine model, utilizes particle cluster algorithm in design space, search for the design variable meeting described mimetic design index.
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