CN102201025A - Design method of head form of high-speed train - Google Patents
Design method of head form of high-speed train Download PDFInfo
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- CN102201025A CN102201025A CN 201110191550 CN201110191550A CN102201025A CN 102201025 A CN102201025 A CN 102201025A CN 201110191550 CN201110191550 CN 201110191550 CN 201110191550 A CN201110191550 A CN 201110191550A CN 102201025 A CN102201025 A CN 102201025A
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Abstract
The invention clams a design method of a head form of a high-speed train, comprising the steps of: 1) performing discrete processing on the outline of a designed train head form to form a surface grid fitted with the outline of a primary head form; 2) selecting key control points according to the features of the head form, and determining the position parameters of the key control points; 3) determining the control regions of the selected key control points; 4) setting the amendment quantity of each selected key control point; 5) calculating the amendment quantity of each grid point in the control region of each key control point according to the amendment quantity of each key control point and the distribution function in the control region; and 6) overlapping the amendment quantity with the relevant grid point coordinates of the primary outline joint by joint according to the grid point positions. By use of the design method, the influence scope of the designed parameters on aerodynamic resistance, elevating force and intersection pressure wave and other key performance indexes of the train can be acquired through numerical analysis and other means, thereby a guiding direction for further amendment of the head form is provided.
Description
Technical field
The present invention relates to a kind of method for designing of train head dummy, relate in particular to a kind of method for designing of bullet train head dummy.
Background technology
Bullet train transportation system has become the advanced delivery vehicle that world many countries is given priority at present.Japan's present travelling speed in the Shinkansen is above 320 kilometers/hour, the top speed of French TGV called train has broken through 574 kilometers/hour, the travelling speed of the military wide high ferro of China surpasses 350 kilometers/hour, and the travelling speed of Shanghai-Hangzhou high ferro breaks through 482 kilometers/hour, becomes the first in the world.Along with improving constantly of train operation speed, air is also increasing to the influence of train.At first, along with the raising of train speed, air resistance is square law and rises, and when train speed per hour surpasses 350 kilometers/hour, the air resistance of train has surpassed 90% of drag overall.Secondly, the raising of train speed will cause pneumatic phenomenons such as intersection pressure wave, tunnel microbarometric wave, have a strong impact on the safety and the riding comfort of train.
Because the aerodynamics problem influence is significantly, the design of bullet train low speed train different from the past, a wherein very important variation that the aspect is the train head dummy, the head dummy of bullet train need be taken into account aesthetic property, practicality and good factors such as aeroperformance.
The bullet train head dummy of China and world other countries all adopts airflow design, to guarantee its better aerodynamic characteristics.Main design comprises two kinds at present, a kind of CAD software that is based on, adopt the combination of all kinds of SPL or curved surface that head dummy is designed, wherein can adopt general CAD software, as AutoCAD, UG, ProE, CATIA etc., also can adopt the design software of exploitation voluntarily or secondary development (flat referring to being permitted, the field red flag, Yao Shuguang, streamlined train head configuration method for designing, China's railway science, 2007).Another kind is according to bionics principle, abstract by existing biology, object and view (as dragon, bullet, sword, river) etc. being carried out art, its characteristics are incorporated the train head dummy, and then design the streamlined train head dummy, kind of head dummy surplus for example China's Beijing-Shanghai express railway of being about to open has promptly designed ten according to this kind method is analyzed relatively to reach and is improved that the back is final determines actual profile.
Head dummy design problem for train, no matter adopt above-mentioned which kind of mode to design, all be difficult to make the train head dummy to guarantee good comprehensive performances by once designing, generally need on the basis of initial designs, by means of various analysis means, the train head dummy is constantly revised, analyzed and optimizes, could obtain more excellent design relatively.Therefore, the reasonable correction for profile is the only stage which must be passed by of train head dummy design.
The head dummy correction of train profile mainly should be considered following factor: 1) original shape of train head dummy refines through art or the surface modeling acquisition often, wherein may contain a large amount of humane factors and practical theory, so the profile correction should keep the modeling characteristic of former profile as far as possible; 2) the profile correction must be considered actual constraint condition, the physical dimension of putting directly some position of head dummy as internal unit retrains, the bend glass at driving cabin position need guarantee that its angle of inclination changes within the specific limits for another example, otherwise will influence driver's sight line etc., therefore, in the actual correction of the flank shape, some position of head dummy will not allow to change; 3) the profile correction should utilize less reference mark, the so effectively workload in finding correction of the flank shape stage as far as possible; 4) after the profile correction, relevant coupling part should be consistent with the smooth degree of former profile, generally need guarantee single order smooth (being that derivative is continuous) at least.
Since adopt fairshaped design, smooth excessive between the each several part of the whole head dummy of bullet train, the general very difficult key design parameter that directly extracts.Existing designing technique (as patent CN1634735A, open day on July 6th, 2005, patent CN101290636, open day on October 22nd, 2008, etc.) be difficult to satisfy simultaneously above-mentioned several requirements.Even adopt technological means such as reverse-engineering, the head dummy controlled variable of train is extracted, also be difficult to satisfy simultaneously above-mentioned several requirements.
Summary of the invention
Problem at prior art exists the object of the present invention is to provide a kind of bullet train head dummy method for designing, can carry out good optimal design.
A kind of bullet train head dummy method for designing of the present invention comprises the steps:
1) profile of the train head dummy that designed is done discrete processes, form and the profile of the initial head dummy surface mesh of match mutually;
2) select critical control point also to determine the location parameter of this critical control point according to the characteristics of head dummy;
3) determine the control domain of selected critical control point, and determine the shape and the size of this control domain;
4) correction of given selected each critical control point, the distribution function in simultaneously given each critical control point control neighborhood;
5) according to the correction and the distribution function in the control neighborhood thereof of each critical control point, calculate the correction that obtains each net point in its control neighborhood;
6) correction is pressed the associated nets lattice point coordinate stack of pointwise of net point position and former profile, thereby obtain revised train profile.
Preferably, described critical control point is selected the one or more zone of radome fairing, nose cone, front shroud, driving cabin, side plate, top board down.
The present invention has following advantage:
1) sensitivity analysis of train head dummy.After the method that adopts the present invention to propose is carried out parametrization to the train head dummy, can obtain the influence amplitude of design parameter by means such as numerical analyses, for further head dummy correction provides direction to Key Performance Indicators such as train aerodynamic drag, lift, intersection pressure waves;
2) the aerodynamic noise source identification of train head, adopt this method that head dummy is carried out parametrization, by extracting different controlled variable, after aerodynamic noise calculates, can directly obtain train head main aerodynamic noise source and different parts the influence of train aerodynamic noise is compared;
3) optimal design of train head dummy, the parametric method that utilizes the present invention to propose can combine with numerical analysis and Optimization Design, carries out the optimal design work of train head dummy.
Description of drawings
Fig. 1 is the embodiment of the invention initial head dummy three-dimensional profile of train head figure to be revised;
Fig. 2 is an initial table veil lattice distribution synoptic diagram;
Fig. 3 is that the radome fairing depression points reduces comparison diagram after 5% under the train head of Fig. 1;
Fig. 4 is that the train head nose cone length of Fig. 1 increases the comparison diagram after 5%;
Fig. 5 is that Fig. 1 train head nose cone height increases the comparison diagram after 20%;
Fig. 6 increases comparison diagram after 10% for Fig. 1 protecgulum-driving cabin tie point axon of validating the car to the position;
Fig. 7 a and 7b are that synthesizing map 2～Fig. 6 is through the revised head dummy comparison diagram of multiparameter.
Embodiment
Main design thought of the present invention is:
1) profile of initial head dummy is carried out discretize, promptly mark off surface mesh;
2) according to the characteristics designated key reference mark and the location parameter thereof of head dummy, the definite of reference mark number of parameters and position decides according to actual conditions, and the location parameter at described reference mark is generally based on rectangular coordinate system in space, given its D coordinates value;
3) to given its control domain scope of each critical control point, the notion of described control domain is the neighborhood interval that variation influenced at reference mark, and this control domain shape and size should be given according to actual conditions;
4) by searching for the position of the coordinate place surface mesh lattice point of determining reference mark and control domain, searching method can adopt general searching method, as traversal search method, dichotomy etc.;
5) correction of given each critical control point, correction can determine by specifying distance and direction cosine between itself and critical control point, also can be definite by the three-dimensional coordinate side-play amount of given critical control point;
6) distribution function in given each critical control point control neighborhood, promptly each controls the interpolating function in neighborhood, and the influence degree of each critical control point correction to associated nets lattice point correction in its control neighborhood determined in acting as of this function.This distribution function should require given according to the characteristics of exact shape and the slickness on control neighborhood border.Generally can adopt cosine distribution function, sigmoid function or comparatively complicated splines;
7) according to the correction and the distribution function in the control neighborhood thereof of each critical control point, calculate the correction that obtains each net point in its control neighborhood;
8) correction is pressed the associated nets lattice point coordinate stack of pointwise of net point position and former profile, obtain revised train profile.
Further specify mentality of designing of the present invention below in conjunction with accompanying drawing.
The original shape of train flow line style head as shown in Figure 1.
Whole head dummy can roughly be divided into several zones such as radome fairing 1, nose cone 2, front shroud 3, driving cabin 4 and side plate 5 down, but all adopts smooth excessive mode to design between most of zone, does not have tangible separatrix between each zone.According to the characteristics of former profile, the flow process that the method that application the present invention proposes is carried out the profile correction is as follows:
Former profile is carried out discretize, mark off the surface mesh of former profile, as shown in Figure 2;
The surface mesh of the initial head dummy of Fig. 2 distributes
Designated key reference mark and coordinate parameters thereof, in this example, characteristics according to head dummy self, following radome fairing depression points on the appointment left-right symmetric face, nose cone point, protecgulum-driving cabin tie point are as critical control point, further extract the coordinate figure of above-mentioned three points according to profile, be respectively: following radome fairing depression points (38003.77,319.09), nose cone point (38291.86,413.79), protecgulum-driving cabin tie point (35487.68,2362.23), the true origin of above-mentioned coordinate figure is chosen as the central point of three row marshalings, and unit is millimeter.
Determine the control neighborhood of each critical control point, here the lateral extent of controlling neighborhood is universe, and longitudinal extent is the along slope coordinate (or along slope coordinate of upper boundary values) of the along slope coordinate (or along slope coordinate of lower border value) at last reference mark to next reference mark;
Obtain the net point numbering at above-mentioned critical control point place by traversal search;
The profile correction at given each reference mark, the profile correction can be given arbitrarily in the boundary value scope here, and detailed correction numerical value and the corresponding profile of revising thereof hereinafter describe in detail.
Distribution function in its control neighborhood of given each reference mark according to the characteristics of initial head dummy, adopts the cosine distribution function here, so can guarantee to guarantee at least that in the junction, border single order is smooth.
Based on above-mentioned flow process, profile is as follows after the correction that given different key point corrections are obtained:
Specify the depression degree increase by 5% of radome fairing depression points down, (left side, XZ plane is revised profile among the figure, and the right side is former profile) more as shown in Figure 3 of correction profile and the former profile of obtaining.
Specify nose cone length to increase by 5%, (left side, XZ plane is revised profile among the figure, and the right side is former profile) more as shown in Figure 4 of correction profile and the former profile of obtaining.
Specify the nose cone height to increase by 20%, (left side, XZ plane is revised profile among the figure, and the right side is former profile) more as shown in Figure 5 of correction profile and the former profile of obtaining.
Specify protecgulum-driving cabin tie point to validate the car axon, (left side, XZ plane is revised profile among the figure, and the right side is former profile) more as shown in Figure 6 of correction profile and the former profile of obtaining to position increase by 10%.
Revise above-mentioned parameter simultaneously, promptly descend that the depression degree of radome fairing depression points increases by 5%, nose cone length increases by 5%, the nose cone height increases by 20%, protecgulum-driving cabin tie point is validated the car axon after the position increases by 10%, institute obtains the comparison of correction profile and former profile shown in Fig. 7 a, 7b.(Fig. 7 a is former profile, and Fig. 7 b is revised profile)
Comparison diagram before and after the aforementioned profile correction as can be seen, after the train head dummy profile modification method that adopts the present invention to propose is revised head dummy, the relevant position of head dummy is effectively revised, and the characteristics and the style that can keep former head dummy fully, in addition, the number of corrected parameter can be selected arbitrarily according to actual conditions, can guarantee to adopt less design parameter to come head dummy is revised.Simultaneously, adopt rational distribution function, can keep the smooth degree of former profile.Therefore, the method that the present invention proposes has characteristics such as thinking is simple, realization is convenient, very is suitable for practical engineering application.
Claims (2)
1. a bullet train head dummy method for designing is characterized in that, comprises the steps:
1) profile of the train head dummy that designed is done discrete processes, form and the profile of the initial head dummy surface mesh of match mutually;
2) select critical control point also to determine the location parameter of this critical control point according to the characteristics of head dummy;
3) determine the control domain of selected critical control point, and determine the shape and the size of this control domain;
4) correction of given selected each critical control point, the distribution function in simultaneously given each critical control point control neighborhood;
5) according to the correction and the distribution function in the control neighborhood thereof of each critical control point, calculate the correction that obtains each net point in its control neighborhood;
6) correction is pressed the associated nets lattice point coordinate stack of pointwise of net point position and former profile, thereby obtain revised train profile.
2. the method for claim 1 is characterized in that, described critical control point is selected the one or more zone of radome fairing, nose cone, front shroud, driving cabin, side plate, top board down.
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| CN201110191550A CN102201025B (en) | 2011-07-08 | 2011-07-08 | Design method of head form of high-speed train |
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| CN201110191550A CN102201025B (en) | 2011-07-08 | 2011-07-08 | Design method of head form of high-speed train |
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| CN102201025B CN102201025B (en) | 2012-09-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106994978A (en) * | 2017-04-28 | 2017-08-01 | 北京机电工程研究所 | A kind of ultrahigh speed pipeline train shape of low aerodynamic drag |
| CN112926131A (en) * | 2021-01-26 | 2021-06-08 | 中车青岛四方机车车辆股份有限公司 | Method and device for determining pneumatic load of vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040236482A1 (en) * | 2003-05-19 | 2004-11-25 | Kane Mark Edward | Method and system for detecting when an end of train has passed a point |
| CN1634735A (en) * | 2003-12-26 | 2005-07-06 | 中南大学 | Design and process method for profile and structure of streamline locomotive |
| CN101354729A (en) * | 2007-07-23 | 2009-01-28 | 南车四方机车车辆股份有限公司 | Method for optimizing low pneumatic noise of high-speed train head section longitudinal symmetry plane line |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040236482A1 (en) * | 2003-05-19 | 2004-11-25 | Kane Mark Edward | Method and system for detecting when an end of train has passed a point |
| CN1634735A (en) * | 2003-12-26 | 2005-07-06 | 中南大学 | Design and process method for profile and structure of streamline locomotive |
| CN101354729A (en) * | 2007-07-23 | 2009-01-28 | 南车四方机车车辆股份有限公司 | Method for optimizing low pneumatic noise of high-speed train head section longitudinal symmetry plane line |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106994978A (en) * | 2017-04-28 | 2017-08-01 | 北京机电工程研究所 | A kind of ultrahigh speed pipeline train shape of low aerodynamic drag |
| CN106994978B (en) * | 2017-04-28 | 2023-09-15 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Ultra-high speed pipeline train appearance structure of low aerodynamic resistance |
| CN112926131A (en) * | 2021-01-26 | 2021-06-08 | 中车青岛四方机车车辆股份有限公司 | Method and device for determining pneumatic load of vehicle |
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