CN106682250A - Establishment method of lightweight civil aircraft model - Google Patents
Establishment method of lightweight civil aircraft model Download PDFInfo
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- CN106682250A CN106682250A CN201510755542.4A CN201510755542A CN106682250A CN 106682250 A CN106682250 A CN 106682250A CN 201510755542 A CN201510755542 A CN 201510755542A CN 106682250 A CN106682250 A CN 106682250A
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Abstract
The invention discloses lightweight model establishment for a civil-aircraft three-dimensional digital model and application analysis thereof. The civil-aircraft three-dimensional model has visual property and has the important significance on improvement of the practice efficiency and accuracy of remote aircraft maintenance, supporting and other engineering. However, the three-dimensional model data volume is large, so that model opening is slow and the time consumed for network transmission is long. Therefore, light weight of the aircraft three-dimensional digital model has important significance in actual practical engineering and relevant operation. For the practical problem, a hierarchical lightweight method of the civil-aircraft three-dimensional model is provided on the basis that existing domestic and overseas research results in the model lightweight field are combined, and the lightweight model adopts the mode that assembly files and part files are stored in a separated mode. The lightweight model of the civil-aircraft three-dimensional model supporting remote network operation and three-dimensional model line maintenance is generated. A test proves that the method can effectively decrease model size, and the transmission speed and model display speed of the model in networks are improved. The lightweight model is mainly applied to visualized fault positioning and maintaining guidance in the fields of civil aircraft line maintenance and remote fault diagnosis.
Description
First, technical field
The present invention be directed to the light weighed model of civil aircraft three-dimensional digital model is set up and its applied analysis.Be mainly used in civil aircraft line maintenance and
Failure in remote fault diagnosis field intuitively changes positioning and maintenance direction.
2nd, background technology
Civil aircraft threedimensional model has intuitive, significant for the efficiency and the degree of accuracy that improve the engineering practices such as aircraft long-distance maintainability support.
But three-dimensional modeling data amount is larger, cause model open slow and network transmission take it is long.
Therefore the lightweight of aircraft three-dimensional digital-to-analogue is significant in Practical Project use and associative operation.For this practical problem,
And combine at present both at home and abroad in the achievement in research in model lightweight field, it is proposed that the light-weighted method of stratification of civil aircraft threedimensional model, and will
Light weighed model carries out assembling the mode that file is stored separately with part file.Generating a kind of support can remote network operation and line maintenance three-dimensional
The light weighed model of the civil aircraft three-dimensional digital-to-analogue of model.
Test shows that the method can effectively reduce the size of model, accelerates model in internetwork transmission speed and model display speed.It is real
Show light weighed model in internetwork quick transmission and accelerate model opening speed.
3rd, the content of the invention
【Goal of the invention】
Civil aircraft three-dimensional digital-to-analogue is introduced in civil aircraft line maintenance and remote fault diagnosis, the intuitive of malfunction coefficient is favorably improved and is accelerated failure
Diagnosis and locating speed.But because civil aircraft three-dimensional digital-to-analogue data volume is big, it is not easy to be transmitted between File Open and network, the pin that the present invention is provided
Mathematical model size can significantly be reduced to the method for building up of the light weighed model of three-dimensional digital-to-analogue, it is possible to achieve the quick opening of model and network
Between quick transmission.
【Technical scheme】
Civil aircraft is typical complex system, and with complex structure, the features such as component is various, therefore its 3-dimensional digital model machine data volume is big.
Analysis is learnt, during civil aircraft model shows, different levels are different to the precise requirements of model, the higher model of level such as product systems level,
Model display precision is required low on the contrary；Contrary level lower model such as part level, it requires display precision higher.Therefore, the present invention
The light weight method of proposition carries out hierarchical partition to three-dimensional digital-to-analogue first.Model can be carried out stratification decomposition according to structure tree：Product systems
Level, subsystem irrespective of size, component system level, part level.
On the basis of model hierarchy, actual lightweight operation is carried out to model, specifically included：
(1) high for required precision part level model, the data recording fashion for taking change model realizes lightweight.Will be by computer
The initial three-dimensional digital-to-analogue that Aid-modeling Tools are produced, with the method storage such as the metastable file format IGS file of structure of neutral file.This
Method intactly retains the structure tree of archetype and important geological information by filtering out the design information of archetype, realizes significantly
Degree reduces file size does not affect file accuracy simultaneously.Ensure that the lossless lightweight of threedimensional model.
(2) for the model level that Inaccurate information is inquired about for general view as subsystem and component system, because belonging to non-precision
The display file of geological information, can be by the way of the optimization of model triangular facet.Before the tri patch of model ensures that model can quickly show
Carry, the tri patchization of model will master mould surface decomposition into multiple triangular facets, the density in adjusting triangle face and then simplify archetype.
I.e. with trigonometric ratio face, side and point presentation of information model data, simplify archetype and further realize lightweight, but the distortion of model can be caused.
Model for general view is not required for the precision of model, therefore due to optimizing the distortion for causing, has no effect on the display effect of model.
(3) model is carried out after different degrees of lightweight operation, the structure tree with archetype be according to carry out model storage management with
Show operation.During specific model management, according to the different hierarchical relationship of model the model of corresponding model node on structure tree is realized
Storage and loaded and displayed.In the present invention, assembling file and model file are separated, by assembling the tissue dress between file record assembly
With relation, the size of block mold file can be reduced with magnitude.
【Beneficial effect】
Light weight method proposed by the present invention requires first to carry out product model hierarchy division, and according to Model Structure Tree to different precision
The level of requirement carries out model storage mode conversion (undistorted model manipulation) or model tri patch optimization (losing genuine model manipulation)
Successively lightweight.And the stage is shown in model, and using logical relations such as the membership credentials and level between assembling file record assembly, can
Significantly to reduce model file data volume size.Specific beneficial effect is represented by following examples.
The present invention carries out model lightweight operation to it with ARJ21 hatch door models as test model according to light weight method proposed by the present invention.
Huge with the hatch door model data amount that computer-aided software engineering is set up, the hatch door model in the present invention is set up with CATIA Software for Design,
Original hatch door model size is 150M.This is a subsystem in ARJ21 aircraft digital-to-analogues, is well imagined with such data volume level,
The data volume of the digital-to-analogue of whole type can be rated as huge.
(1) model storage mode change.By changing mathematical model storage mode, neutral file format IGS is adopted in the present invention, it is right
Part model PD_523A1100-006-001 in system, requires to show accurately accurately looking into for the ease of model during model shows
See.Its original CATIA models size is 311KB, and after storage mode is changed, it is 61KB to obtain IGS file sizes.
(2) model tri patch optimization.With trigonometric ratio face, side and point presentation of information model data, simplify archetype further real
Existing lightweight, but the distortion of model can be caused.Model for general view is not required for the precision of model, therefore due to optimizing the distortion for causing,
Have no effect on display effect.The process breaks up model triangular facet, obtains more tri patch, is used by instrument, adjusts model parameter
So that the total tri patch quantity of model is reduced, and then reduce model file size.
(3) by the way of assembling file and assembly are stored separately, and during model shows, according to structure tree and assembling file,
Successively display model.Introduce assembling file, be it is relative with whole model size for be that the file size of magnitude reduces.And for model
Change, renewal directly can be modified to assembling file, and assemble file size very little, be easy to be transmitted between network.For AJR21's
Hatch door model, its archetype file size is 150MB, and assembly file size is 422KB.
4th, illustrate
Fig. 1 model weight reduction process
Fig. 2 light weighed models are stored and loaded and displayed
5th, specific embodiment
Below in conjunction with the accompanying drawings the present invention is further described.
Civil aircraft is typical complex system, and with complex structure, the features such as component is various, therefore its 3-dimensional digital model machine data volume is big.
Analysis is learnt, during civil aircraft model shows, different levels are different to the precise requirements of model, the higher model of level such as product systems level,
Model display precision is required low on the contrary；Contrary level lower model such as part level, it requires display precision higher.Can according to structure tree
Model is carried out into stratification decomposition：Product systems level, subsystem irrespective of size, component system level, part level.The mathematical model of different levels, it shows
Show that required precision is different, herein when lightweight operation is carried out to it, using the model light weight method of stratification.
Aircraft digital-to-analogue weight reduction process is made up of following four part, as shown in Figure 1 and Fig. 2.
(1) high for required precision part level model, the data recording fashion for taking change model realizes lightweight.ARJ21 in this example
Hatch door model, for archetype is changed storage format by its part level model using CATIA, neutral geometry file IGES is output as in this example
File, can effectively reduce original document size 1/5.The method intactly retains archetype by filtering out the design information of archetype
Structure tree and important geological information, realize significantly reduce file size while not affecting file accuracy.Ensure that threedimensional model
Lossless lightweight.
(2) for the model level that Inaccurate information is inquired about for general view as subsystem and component system, because belonging to non-precision
The display file of geological information, can be by the way of the optimization of model triangular facet.Before the tri patch of model ensures that model can quickly show
Carry, the tri patchization of model will master mould surface decomposition into multiple triangular facets, the density in adjusting triangle face and then simplify archetype.
I.e. with trigonometric ratio face, side and point presentation of information model data, simplify archetype and further realize lightweight, but the distortion of model can be caused.
Model for general view is not required for the precision of model, therefore due to optimizing the distortion for causing, has no effect on model general view effect.
(3) model of non-part level level belongs in essence assembling file, for the assembling structure of record cast and matching somebody with somebody for each part
Conjunction relation.Because part is numerous in complication system, at the beginning of product model is designed, in order to ensure the integrality of product, many assembling body weight are deposited
In the phenomenon of the model data redundancy such as part.By the way of part file is separated with assembling file, assembly information, part are shown and zero
Part geological information is stored in respectively in different files.Reusing and then largely solving the problems, such as data redundancy by part, further completes
Data model carries out lightweight operation.
(4) in model storing process, by the way of assembling file and part file are stored separately, file record different levels mould is assembled
The assembly informations such as position relationship, the adduction relationship of each part of type, the not set of model data, therefore file size is less.Because introducing
Assembly file, therefore for the part model repeated in whole machine model, then zero is realized without the need for repeating to store in part file
The reuse of part model, further reduces file size.Part file saves the part model preserved with neutral geometry file format, filters former
The design information of beginning model, does not change structure tree and the precision of original document while file size is reduced.In light weighed model file
During display, carry out the loaded floor by floor of different levels nodal analysis method and show also according to the structure tree of original document.For the layer of model general view
Level, tri patch optimization operation is carried out to model, although simplified model can cause model distortion to a certain extent to accelerate model shows speed
Degree.
Claims (4)
1. civil aircraft light weighed model is set up and realizes that the large-scale three dimensional such as civil aircraft mathematical model is applied in fault diagnosis with line maintenance field
Precondition, the method for building up of light weighed model proposed by the present invention is on the basis of the hierarchical partition based on model, can be greatly reduced
The data volume size of model, its process is made up of three below part：
(1) model storage mode change, by changing mathematical model storage mode, adopts metastable neutral file lattice in the present invention
Formulas I GS, for the part model in system, the precise requirements that it shows are higher, accurately checking for the ease of model, by the method
With the lossless lightweight of implementation model, and for the model of general view is only required, further lightweight operation can be carried out to model；
(2) model tri patch optimization, with trigonometric ratio face, side and point presentation of information model data, simplifies archetype further real
Existing lightweight, but the distortion of model can be caused, the model for general view is not required for the precision of model, therefore due to optimizing the distortion for causing,
Display effect is had no effect on, the process breaks up model triangular facet, obtain more tri patch, used by instrument, adjust model parameter
So that the total tri patch quantity of model is reduced, and then reduce model file size；
(3) by the way of assembling file and assembly are stored separately, and during model shows, according to structure tree and assembling file,
Successively display model, introduces assembling file, be it is relative with whole model size for be that the file size of magnitude reduces, and for model
Change, renewal directly can be modified to assembling file, and assemble file size very little, be easy to be transmitted between network.
2. according to claim 1, it is characterized by lightweight operation is that the model of different levels is entered according to the hierarchical partition of model
Row lightweight is operated；The three-dimensional digital-to-analogue data volume created by computer-aided tool is big, transmits between the quick opening and network of unsuitable file,
Using neutral file as model storage format, it is characterized in having no effect on the display precision of file in the case where file data amount is reduced, i.e.,
Can be with the lossless lightweight of implementation model.
3. according to claim 2, it is characterized by carrying out model tri patch optimization, with trigonometric ratio face, side and point presentation of information mould
Type data, further realize lightweight to model, but the distortion of model, the model for general view can be caused to be not required for the precision of model, because
This has no effect on display effect due to optimizing the distortion for causing；The process breaks up model triangular facet, obtains more tri patch, passes through
Using aid, adjust model parameter and the total tri patch quantity of model is reduced, and then reduce model file size；For do not have compared with
Height shows the model of the level of accuracy, the method optimized using tri patch, can reduce the data volume size of model with magnitude, but meeting
Cause model distortion to a certain extent, it is adaptable to the model of general view.
4. according to claim 3, it is characterized by the Hierarchical storage of light weighed model with show, because part is numerous in complication system,
At the beginning of product model is designed, in order to ensure the integrality of product, be present the phenomenon of the model data redundancy such as part in many assembling body weight, adopt
The mode that part file is separated with assembling file, assembly information, part is shown and be stored in respectively in different files from part geometry information, is led to
Reusing and then largely solving the problems, such as data redundancy for part is crossed, further completing data model carries out lightweight operation；In lightweight
During the display of model file, carry out the loaded floor by floor of different levels nodal analysis method and show also according to the structure tree of original document, for mould
The level of type general view, tri patch optimization operation is carried out to model, although simplified model can cause model distortion to a certain extent to accelerate
Model display speed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109063223A (en) * | 2018-05-29 | 2018-12-21 | 中建科技有限公司深圳分公司 | The light weight method and device of BIM model and the processing method and system of BIM model |
| CN110060352A (en) * | 2019-04-17 | 2019-07-26 | 深圳天际云数字技术有限公司 | Threedimensional model holography exchange method and system |
| CN110503718A (en) * | 2019-08-20 | 2019-11-26 | 上海航空工业(集团)有限公司 | Three-dimensional engineering model lightweight display methods |
| CN115291842A (en) * | 2022-08-24 | 2022-11-04 | 金航数码科技有限责任公司 | Light-weight conversion and online browsing method and system for CAD structural part |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109063223A (en) * | 2018-05-29 | 2018-12-21 | 中建科技有限公司深圳分公司 | The light weight method and device of BIM model and the processing method and system of BIM model |
| CN109063223B (en) * | 2018-05-29 | 2023-09-19 | 中建科技有限公司深圳分公司 | BIM model light weight method and device and BIM model processing method and system |
| CN110060352A (en) * | 2019-04-17 | 2019-07-26 | 深圳天际云数字技术有限公司 | Threedimensional model holography exchange method and system |
| CN110503718A (en) * | 2019-08-20 | 2019-11-26 | 上海航空工业(集团)有限公司 | Three-dimensional engineering model lightweight display methods |
| CN110503718B (en) * | 2019-08-20 | 2023-12-05 | 上海航空工业(集团)有限公司 | Three-dimensional engineering model lightweight display method |
| CN115291842A (en) * | 2022-08-24 | 2022-11-04 | 金航数码科技有限责任公司 | Light-weight conversion and online browsing method and system for CAD structural part |
| CN115291842B (en) * | 2022-08-24 | 2024-01-30 | 金航数码科技有限责任公司 | CAD structural member lightweight conversion and online browsing method and system |
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Application publication date: 20170517 |