CN108460828A - A kind of 3D printing navigation channel model fast modeling method - Google Patents
A kind of 3D printing navigation channel model fast modeling method Download PDFInfo
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- CN108460828A CN108460828A CN201810249483.7A CN201810249483A CN108460828A CN 108460828 A CN108460828 A CN 108460828A CN 201810249483 A CN201810249483 A CN 201810249483A CN 108460828 A CN108460828 A CN 108460828A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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Abstract
A kind of 3D printing navigation channel model fast modeling method, includes the following steps：The initial terrain data for including landform altitude of gathering project section；Determine modelling range；Reject the improper data in initial terrain data；Determine model two sides flat-top elevation；Bank elevation is replaced using two sides flat-top elevation；Determine model bottom elevation；Integrated Models boundary Control point data；Carry out discrete processes；Navigation channel model is generated, Slicing Model for Foreign is multiple navigation channel model blocks, and model block is exported and printed.Modeling method provided by the invention can be that any river with complicated landform establishes the mathematical model identified for 3D printer rapidly, it can be ensured that river topography model has higher similarity with prototype.
Description
Technical field
The invention belongs to hydraulic engineering fields, and in particular to a kind of 3D printing navigation channel model fast modeling method.
Background technology
To many problems involved in WR project plan, design, construction and operational management, generally require by means of object
Model test is managed to solve the problems, such as, therefore water conservancy project and river model test are widely used to engineering practice.Model test is exactly
It copies substance in kind, prototype contraction is subjected to experimental study at model according to similarity criterion, is recurred using model similar to substance
Natural situation be observed and analyze and research, then according to certain similarity criterion amplification to prototype.
Due to practical streamflow complexity, the simple method using theoretical method and numerical simulation solves the problems, such as that navigation channel hinders boat
Prodigious difficulty can be encountered, therefore can yet be regarded as one in such a way that theory analysis, numerical simulation are combined using model test and have
The solution route of effect.Model investigation is typically to be that prototype is similar and reduces and is carried out on the physical model of geometric dimension,
Engineering proposal is implemented in simulation in a model, and the fluidised form and hydraulic elements in observation model make it meet the navigation requirement of engineering section,
Then these engineering proposals and its measured data are extended into prototype up again, therefore the precision of modelling is largely
Determine the accuracy of waterway regulation model test conclusion.
The main method for making river model at present is to read and make river big cross section, according to lead location in section line
On carry out model after sectional board and fill and striking by putting, finally check landform and complete modelling.In the mistake of this making model
Cheng Zhong, it is manually inevitable by construction error caused by section is put；In addition, breaking at two when conventionally filling river
River mima type microrelief between face has missing, this can have an impact the similitude of model and prototype, particularly with river topography
Complicated mountain stream, therefore for the production method of traditional waterway regulation model up for further improving.With increasing material
The continuous innovation of (3D printing) technology of manufacture, possibility is provided to further increase modelling precision.Based on this, the present invention carries
Go out a kind of 3D printing waterway regulation model fast modeling method, to realize the printing of navigation channel model.
Invention content
The present invention is directed to deficiency in the prior art, provides a kind of 3D printing navigation channel model fast modeling method.
To achieve the above object, the present invention uses following technical scheme：
A kind of 3D printing navigation channel model fast modeling method, which is characterized in that include the following steps：
Step 1：The initial terrain data for including landform altitude of gathering project section；
Step 2：Determine modelling range；
Step 3：Reject the improper data in initial terrain data；
Step 4：Determine model two sides flat-top elevation；
Step 5：Bank elevation is replaced using two sides flat-top elevation；
Step 6：Determine model bottom elevation；
Step 7：Integrated Models boundary Control point data；
Step 8：Carry out discrete processes；
Step 9：Navigation channel model is generated, Slicing Model for Foreign is multiple navigation channel model blocks, and model block is exported and printed.
To optimize above-mentioned technical proposal, the concrete measure taken further includes：
The step 3 specifically includes：
1) depth of water threshold value N rejected is selected；
2) lowest navigable stage X is determined；
3) the height value Y of a point is choseni, the local depth of water is found out, and be compared with depth of water threshold value, is greater than or equal to water
Deep threshold value then rejects the point, is less than then retention data, i.e.,：
X-Yi＞=N data are rejected
X-Yi＜ N data retain
4) repeat previous step, traverse entire initial terrain data, reject all improper datas, formed after rejecting figurate number
According to.
The step 4 specifically includes：Model two sides flat-top elevation is determined according to model test extreme high water, with model
Upstream extreme high water floating certain distance is as two sides flat-top elevation M.
The step 5 specifically includes：
1) for terrain data after rejecting, the height value Y of a point is extractedi, find out point height value YiWith two sides flat-top height
The difference of journey M gives assignment Y to the height value of the point again if its difference is more than zeroi=M；If the two interpolation be less than etc.
In 0, which is retained, i.e.,：
YiThe then Y of-M ＞ 0i=M
Yi- M ＜=N data retain
2) each data in terrain data after rejecting are chosen successively, are repeated previous action, are formed landform after replacing
Data.
The step 6 specifically includes：Minimum point is found in terrain data after rejecting, and on the basis of the minimum point
It floats downward the elevation reached after certain distance and is denoted as model bottom elevation D.
The step 7 specifically includes：The two-dimensional coordinate of each controlling node of modelling range boundary is distinguished
Model Bottom Altitude D and two sides flat-top elevation M in addition, and the three-dimensional point of generation is added to after replacement in terrain data, shape
At terrain data after integration.
The step 8 specifically includes：Terrain data after integration is separated into the discrete rear ground figurate number with interplanar spacing
According to.
The step 9 specifically includes：Terrain data after discrete is converted into stl file, to the stl file of foundation according to
The planar dimension of navigation channel model carries out isometric wide segmentation, and the stl file of multiple navigation channel dummy blocks is generated after the completion of segmentation,
Stl file after segmentation is transmitted to 3D printer and is printed.
The beneficial effects of the invention are as follows：The modeling method of offer, can rapidly be any river with complicated landform establish for
The mathematical model of 3D printer identification, it can be ensured that river topography model has higher similarity with prototype.
Description of the drawings
Fig. 1 is the modeling method flow chart of the present invention.
Fig. 2 is all field hinges figure of navigation channel modeling nearby.
Specific implementation mode
In conjunction with the accompanying drawings, the present invention is further explained in detail.
A kind of 3D printing as shown in Figure 1 waterway regulation model fast modeling method, specifically includes：Terrain data is adopted
Collection, the determination of modelling range, improper data are rejected, determine that model two sides flat-top elevation, two sides flat-top elevation replace bank
Side elevation determines that model bottom elevation, the model boundary control integration of point data, terrain data be discrete, navigation channel model stl file
Generation, model cutting, model block output and printing etc. multiple steps.
One, terrain data acquires
The river topography of quasi- regulation section is surveyed and drawn using various measurement facilities, obtains the initial landform of engineering section
Data.
Two, the determination of modelling range
According to the reality of engineering section and the renovating effect estimated, appropriate Selection Model makes range, model system
The determination for making range should be to ensure that modelling range does not have an impact as foundation model test result.
Three, improper data is rejected
In measurement process, due to human error, machine error and to generate some obviously different from section normal height value
Data, for ensure model accuracy and such data must be rejected from terrain data, specific algorithm steps include：
1) depth of water threshold value rejected is selected
Generally, for the Changjiang river and tributary navigation channel, due to nature evolution, artificial exploitation etc. caused by navigation channel water
It is deep not exceed 50m generally, because selected 50m is to determine to judge that data are normal and improper depth of water threshold value, marked with code name N
Know.
2) determination of lowest navigable stage
For the Changjiang river and tributary navigation channel, there is a corresponding lowest navigable stage, inquire the section in each section
Lowest navigable stage concrete numerical value, with code name X identify.
3) height value for choosing a point (is identified as Yi), the local depth of water is found out, and be compared with depth of water threshold value, is more than
Or the point is then rejected equal to threshold value, it is less than then retention data, i.e.,：
X-Yi＞=N data are rejected
X-Yi＜ N data retain
4) step 3) is repeated, entire terrain data is traversed, rejects all improper datas, forms terrain data after rejecting.
Four, model two sides flat-top elevation is determined
The highest elevation of model two sides printing is determined according to model test extreme high water, two sides flat-top elevation is on model
Extreme high water floating suitable distance is swum as two sides flat-top elevation, is denoted as M.
Five, flat-top elevation in two sides replaces bank elevation
The bank height value more than flat-top height value is replaced with two sides flat-top height value, key step includes：
1) it is ready to reject the terrain data of outlier；
2) height value for extracting a point (is identified as Yi), find out YiWith the difference of M, if its difference be more than zero, again
Assignment Y is given to the height value of the pointi=M；If the two interpolation is less than or equal to 0, which is retained, i.e.,：
YiThe then Y of-M ＞ 0i=M
Yi- M ＜=N data retain
3) each data in terrain data are chosen successively, and carry out the operation of step 2).
Six, model bottom elevation is determined
Minimum point is found in the terrain data for rejecting outlier, and appropriately distance is floated downward on the basis of the minimum point
The elevation D reached afterwards is denoted as model bottom elevation.
Seven, the integration of model boundary control point data
The two-dimensional coordinate of each controlling node of modelling range boundary is added into elevation D and M respectively, and will
These three-dimensional points are added in the terrain data that flat-top elevation is substituted.
Eight, terrain data is discrete
The terrain data that previous step is formed is separated into the terrain data of suitably planar spacing.
Nine, the generation of navigation channel model stl file
Terrain data after will be discrete is converted to stl file.
Ten, model cutting
Since physical model is larger, it can not once print and finish completely, it need to be to the stl file of foundation institute according to navigation channel model
Planar dimension carry out substantially isometric wide segmentation, specific size can print full-size as upper limit standard using 3D printer
It is chosen, the stl file of multiple navigation channel dummy blocks is generated after the completion of segmentation.
11, model block output and printing
The stl file after segmentation 3D printer is transmitted to successively to print.
Now by taking the Jiang Zhoutian hinge waterway regulation models of Guangdong Province north as an example, to the 3D printing fast run-up of waterway regulation model
Mould method is further elaborated.
1, according to the data of survey crew's testing and test objective requirement, modelling range is determined；
2, improper measurement data is rejected, according to model test scheme, determining model flat-top elevation M=80m, (56 Huanghai Sea are high
Journey, similarly hereinafter) and Bottom Altitude D=40m；
3, the bank height value more than flat-top height value is replaced with two sides flat-top height value；
4, the two-dimensional coordinate of each controlling node of modelling range boundary is added into elevation D and M respectively, and
These three-dimensional points are added in the terrain data that flat-top elevation is substituted；
5, the terrain data that previous step is formed is separated into conversion in the terrain data that navigation channel prototype medium spacing is 5m；
6, the terrain data after will be discrete is converted to stl file；
7, it is larger to be conducive to physical model, can not once print and finish completely, it need to be to the stl file of foundation institute according to navigation channel mould
The planar dimension of type carries out substantially isometric wide segmentation, and the stl file of multiple navigation channel dummy blocks is generated after the completion of segmentation；
8, the stl file after segmentation 3D printer is transmitted to successively to print.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as the protection of the present invention
Range.
Claims (8)
1. a kind of 3D printing navigation channel model fast modeling method, which is characterized in that include the following steps：
Step 1：The initial terrain data for including landform altitude of gathering project section；
Step 2：Determine modelling range；
Step 3：Reject the improper data in initial terrain data；
Step 4：Determine model two sides flat-top elevation；
Step 5：Bank elevation is replaced using two sides flat-top elevation；
Step 6：Determine model bottom elevation；
Step 7：Integrated Models boundary Control point data；
Step 8：Carry out discrete processes；
Step 9：Navigation channel model is generated, Slicing Model for Foreign is multiple navigation channel model blocks, and model block is exported and printed.
2. a kind of 3D printing navigation channel model fast modeling method as described in claim 1, it is characterised in that：The step 3
It specifically includes：
1) depth of water threshold value N rejected is selected；
2) lowest navigable stage X is determined；
3) the height value Y of a point is choseni, the local depth of water is found out, and be compared with depth of water threshold value, is greater than or equal to depth of water threshold
Value then rejects the point, is less than then retention data, i.e.,：
X-Yi＞=N data are rejected
X-Yi＜ N data retain
4) previous step is repeated, entire initial terrain data is traversed, rejects all improper datas, form terrain data after rejecting.
3. a kind of 3D printing navigation channel model fast modeling method as claimed in claim 2, it is characterised in that：The step 4
It specifically includes：Model two sides flat-top elevation is determined according to model test extreme high water, is floated with model upstream extreme high water
Certain distance is as two sides flat-top elevation M.
4. a kind of 3D printing navigation channel model fast modeling method as claimed in claim 3, it is characterised in that：The step 5
It specifically includes：
1) for terrain data after rejecting, the height value Y of a point is extractedi, find out point height value YiWith two sides flat-top elevation M
Difference, if its difference be more than zero, assignment Y is given to the height value of the point againi=M；If the two interpolation is less than or equal to
0, which is retained, i.e.,：
YiThe then Y of-M ＞ 0i=M
Yi- M ＜=N data retain
2) each data in terrain data after rejecting are chosen successively, are repeated previous action, are formed terrain data after replacing.
5. a kind of 3D printing navigation channel model fast modeling method as claimed in claim 4, it is characterised in that：The step 6
It specifically includes：Minimum point is found in terrain data after rejecting, and is reached after floating downward certain distance on the basis of the minimum point
To elevation be denoted as model bottom elevation D.
6. a kind of 3D printing navigation channel model fast modeling method as claimed in claim 5, it is characterised in that：The step 7
It specifically includes：The two-dimensional coordinate of each controlling node of modelling range boundary is added into model Bottom Altitude respectively
D and two sides flat-top elevation M, and the three-dimensional point of generation is added to after replacement in terrain data, form terrain data after integrating.
7. a kind of 3D printing navigation channel model fast modeling method as claimed in claim 6, it is characterised in that：The step 8
It specifically includes：Terrain data after integration is separated into the discrete rear terrain data with interplanar spacing.
8. a kind of 3D printing navigation channel model fast modeling method as claimed in claim 7, it is characterised in that：The step 9
It specifically includes：Terrain data after discrete is converted into stl file, to the stl file of foundation according to the planar dimension of navigation channel model
Isometric wide segmentation is carried out, the stl file of multiple navigation channel dummy blocks is generated after the completion of segmentation, the stl file after segmentation passes
3D printer is transported to be printed.
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| CN114103127A (en) * | 2022-01-24 | 2022-03-01 | 武汉幻城经纬科技有限公司 | Drainage basin terrain 3D printing method and device, electronic equipment and storage medium |
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