CN109445305A - A kind of the assembly precision simulating analysis and system twin based on number - Google Patents
A kind of the assembly precision simulating analysis and system twin based on number Download PDFInfo
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- CN109445305A CN109445305A CN201811257485.7A CN201811257485A CN109445305A CN 109445305 A CN109445305 A CN 109445305A CN 201811257485 A CN201811257485 A CN 201811257485A CN 109445305 A CN109445305 A CN 109445305A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention discloses a kind of the assembly precision simulating analysis and system twin based on number to be acquired the twin data of physics erecting yard, handle, and twin data information is expressed and stored for the critical process in complex product assembly；Assembly process model is obtained from three-dimensional assembly technique designing system, and is based on twin data, assembly process model is reconstructed, and generates the twin model of assembly process；The twin model of assembly process is imported in commercialization assembly tolerance analysis software and carries out assembly precision emulation and Calculation of Sensitivity；According to assembly process Simulation on Precision Analysis as a result, carry out assembling process online compensation be precisely controlled.The present invention realizes the depth integration of erecting yard physical space and information space, and for realizing that the Intelligent closed-loop of complex product assembling process controls, improving assembling quality and efficiency has great significance.
Description
Technical field
The present invention relates to a kind of Intelligent assembly precision simulation technology more particularly to a kind of assembly twin based on number
Simulation on Precision Analysis method and system.
Background technique
Assembly is the key link of product development process, and part is assembled by defined technical requirements, and passes through
Debugging, inspection make qualified products.According to statistics, assembly work amount accounts for entire product development workload in modern manufacturing
20%~70%, average out to 45%, assembly time accounts for the 40%~60% of entire manufacturing time.The assembling capacity of product and assembly
Quality not only directly affects properties of product, but also the hand labour amount that assembly generally takes up is big, costly and to belong to product raw
Is produced from the rear end of work, improving Assembling Production efficiency and assembling quality has more importantly engineering significance.With Aeronautics and Astronautics,
The direction of the large scaled complex products such as automobile, ship, electronics towards intelligent, precise treatment and optical, mechanical and electronic integration is developed, and produces
Product design of part becomes increasingly complex, and assembly has become the weak link in complex product development process with adjustment.These are large-scale
Complex product have amount of parts is many kinds of, structure size variation greatly and shape is irregular, Single unit job lot production, assembly
The features such as required precision is high, assembly coordination process is complicated, assembled in situ is generally considered to be typical discrete type assembling process,
Even in the case where product component is all qualified, it is also difficult to the one-time success rate for guaranteeing Product Assembly, generally require through
Cross repeatedly selection trial assembly, repair, adjustment assembly, or even disassembly, qualified products can just be assembled by doing over again.
The appearance of computer and digitizing technique is greatly promoted the fast development of mounting technology.Numeric terminal is to produce
Product mounting technology and computer technology, network technology and management science intersect, merge, the result of development and application.Digitlization
Combination, that is, numeric terminal technology of technology and traditional mounting technology.Numeric terminal refer to using digital mockup plan and
The technology general name of the practical set process of artificial product, be based primarily upon product digital prototype carry out product coordinate scheme design and
Assembling capacity analysis, and the assemble sequence to the assembling technology procedure of product, assembly path and assembly precision etc. planned,
Emulation and optimization, to achieve the purpose that effectively improve product assembly quality and efficiency.(Model is defined with based on model
Based Definition, MBD) extensive use of the technology in complex product development process, threedimensional model gives birth to entirely as product
The unique data source for ordering the period, realizes design-technique-manufacture-assembly-detection based on threedimensional model, so that based on three-dimensional
The Assembly Process planning of model and erecting yard apply more and more attention has been paid to attention.Three-dimensional assembly technique designing technique utilizes
Threedimensional model is analyzed, verified and is optimized to product assemblability, detachability, maintenanceability under three-dimensional environment, and
Assembling technology procedure to product includes that assemble sequence, assembly path and the assembly precision of product, assembly performance etc. are advised
It draws, emulate and optimizes, to reduce the trial assembly number in kind in complex product development process, improve product assembly quality, efficiency
And reliability.
Traditional Products Digital assembly simulation method is mostly based on ideal digital-to-analogue, which can be in Assembly Process planning rank
Section is for checking assembly sequence, obtaining the links such as assembly path, Assembly Interference detection, assembly tolerance analysis, although in certain journey
The problem of reducing assembling process on degree.However, for the weaponry assembled in situ of Single unit job lot production,
Numeric terminal emulation at this stage cannot still fully meet the Real-time process schemes such as repair or the adjustment of assembled in situ generation
Variation, mainly due to not considering in the assembly tolerance analysis stage from the factors such as part manufacturing error and assembling process error
Caused by.It is how right through carrying out live Product Assembly operation frequently with Repairation or adjusting method in complex product assembling process
Assembling process error accumulation is analyzed, and Product Assembly precision is predicted before product practical set, how according to erecting yard
The reasonable reliable adjustment scheme of the practical set size real-time design of acquisition is the difficult point of current virtual assembly and numeric terminal
One of.Current Virtual assemble or assembly simulation technology be not due to accounting for the practical accuracy of manufacture information of part and practical geometry
The influence factors such as the contiguity constraint relationship on surface cause existing assembly precision prediction to be difficult to apply to practical set with optimization method
Scene.
With generation information and the communication technology (such as Internet of Things, big data, industry internet, mobile interchange) and soft or hard
The high speed development of part system (such as information physical emerging system, radio frequency identification, intelligence equipment), the twin technology of number go out
Now for realize manufacturing process in physical world and information world interconnection and it is co-melting, realization product lifecycle in it is multi-source heterogeneous
The Optimal Decision-making etc. of various activities provides solution during the effective integration of data and management and realization product development.
Summary of the invention
Technical problem to be solved by the present invention lies in: actual situation mapping depth is inadequate in current production assembling process, assembly
Live assembling capacity predicting means missing, provides a kind of the assembly precision simulating analysis and system twin based on number.
The present invention is to solve above-mentioned technical problem by the following technical programs, and of the invention is a kind of twin based on number
Assembly precision simulating analysis, comprising the following steps:
(1) twin data acquisition, expression and processing
The twin data of crucial assembly process physics erecting yard are acquired, are handled, and by twin data information into
Row expression storage, makes it have the ability simulated according to twin data and twin model to actual physics assembling process；
(2) the twin model construction of assembly process
Assembly process model is obtained in three-dimensional assembly technique designing system, and is based on twin data, to assembly process
Model is reconstructed, and generates the twin model of assembly process of fusion erecting yard practical set situation and actual measurement information；
(3) assembly process Simulation on Precision Analysis and Calculation of Sensitivity
The twin model of the assembly process of building is imported into commercialization assembly tolerance analysis software, it is twin to define assembly process
The assembly constraint of raw model, determines simulation analysis target, determines components assemble sequence according to practical set sequence, and imitated
True analysis, determines the probability distribution graph of simulation objectives size, and check sensitivity data；
(4) online compensation of assembling process
According to assembly process Simulation on Precision Analysis as a result, controlling assembling process.
As one of preferred embodiment of the invention, in the step (1), twin data include assembling process information, key
Metrical information, the tooling information of feature, the expression of twin data include the expression of assembling process information, the measurement of key feature letter
Breath expression, tooling information representation.
Further, the expression of the assembling process information is used based on key feature and digraph to physics assembling process
Be described: node indicates key feature, and side indicates size, geometric tolerances or assembly constraint, and wherein the starting point on side indicates benchmark
Feature, terminal indicate target signature, dotted line indicate inside parts or completed assembly sub-assemblies inside size, geometry
Tolerance or assembly constraint, solid line indicate size, geometric tolerances or the assembly constraint to be realized after the completion of this road assembly process.
Further, the key feature is the part or components having a significant impact to this road assembly process assembling quality
Geometrical characteristic, the related benchmark geometrical characteristic of positioning, clamping that the road Huo Duizhe assembly process assembling quality has a significant impact.
Further, the key feature metrical information by digitized measurement equipment and analysis system to key feature into
The acquisition of row data, and pre- place is obtained after the analyses such as noise spot processing, Data Integration, data compaction processing to measurement data
Measured data after reason, thus the twin data of the measurement for obtaining key feature, and technology is defined using based on model, measurement is obtained
Dimensional tolerance, geometric tolerances, surface structure information is obtained to be defined in the twin model of assembly process.
Further, the expression of the tooling information is by establishing the twin model of tooling, and by the practical dimensioning of tooling
Very little information, positioning, clamping precision information are defined in the twin model of tooling.
In the step (2), assembly process model is generated by three-dimensional assembly technique designing system, is this road assembler
The threedimensional model corresponding to assembly processed is formed by after the completion of sequence.
The twin model of assembly process is to be with the physical entity in assembly processed of this road assembly process in the step (2)
Basis is acquired by data, will be passed through synchronous actual situation mapping in entire assembly model processed in physical space, is existed using twin data
Three-dimensional assembly process model is reconstructed in information space and forms threedimensional model.
The reconstruct of assembly process model includes: in the step (2)
(21) according to the practical set sequence of assembly shop this procedure components to assembly process Model Structure Tree zero
Part node sequence is adjusted, and can reflect assembling process information；
(22) twin using actual measurement to the part geometry model and entire assembly model originally generated with ideal dimensions
Data-driven part geometry model and entire assembly model regenerate；
(23) frock clamp and its precision information used by this road assembly process is added, i.e., the twin model of tooling is added
Into assembly process model, by handling above, the twin model of assembly process is constructed, realizes three-dimensional dress under digital virtual environment
Depth integration with the twin model of process and real physical model.
Determine certain size or geometric tolerances to target size or geometric tolerances by Calculation of Sensitivity in the step (3)
Influence degree, to grasp the position for needing emphasis coordinated control in this process assembling process in advance, sensitivity is higher, and indicating should
Size or geometric tolerances influence greatly target size assembly precision, otherwise influence small.
In the step (4), it includes improving positioning, clamping precision that assembling process, which carries out control, and emphasis improves high sensitivity
Size assembly precision, reduce the low size assembly precision of sensitivity, or carry out precision controlling etc. by adjusting mechanism.
A kind of system emulated using the assembly precision simulating analysis twin based on number, the system
System includes physics assembly layer, twin data perception layer, twin model layer and prediction optimization layer；
Physics assembly layer is the physical entity set of objective reality in workshop, executes the Assembling Production in workshop and to letter
It ceases space and data is provided；
The twin data perception layer by being deployed in the Internet of Things in workshop, using digital measurement device, PLC, sensor,
The creation data of physics assembly layer is acquired, handled and merged, generates twin number by RFID and other intelligent acquisition equipment
According to；
The twin model layer is the digitlization mirror image of physics assembly shop entity, including the twin model of assembly process, dress
With the twin model of environment, the twin model of assembly equipment, the twin model of assembly tool；
The prediction optimization layer is based on twin data and carries out assembly precision simulation analysis and Calculation of Sensitivity, and according to emulation
As a result it carries out the online compensation of assembling process and is precisely controlled, realize the Intelligent closed-loop control of complex product assembling process.
The twin model layer is to pass through twin number based on the static models that physics assembly shop solid modelling generates
According to sensing layer, the physical entities such as real-time data acquisition and monitoring, dynamically track physics assembly shop assembly equipment, tooling, tool
Working condition, by the assembly shop physical entity in physical space by synchronization map information space carry out total factor reconstruction
The dummy model set of formation.
Twin process model is assembled by establishing three-dimensional based on the twin assembly precision emulation of number, introduces erecting yard
Practical set situation and actual measurement information, being based on twin data and twin model, with high fidelity analog physical assembly is existing in real time
Field and assembling process are able to achieve assembly precision prediction, and according to practical set precision simulation as a result, real-time and accurately providing repair
It is recommended that and optimization assembly method, for realize complex product science assembly and assembling quality prediction provide effective way, for
Realize the Intelligent closed-loop control of complex product assembling process, improving assembling quality and efficiency has great significance.
The present invention has the advantage that assembly process simulation is emulated from Virtual assemble to actual situation combination compared with prior art
Assembly simulation transformation, model data are changed from Theoretical Design model to Model Measured data, and assembling process is by digitize guidance
Physics assembling process changes to physics, Virtual assemble common evolutionary.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is that the present invention is based on the assembling process of key feature and digraph to express schematic diagram；
Fig. 3 is the entire assembly model schematic diagram in embodiment；
Fig. 4 is to express schematic diagram based on the assembling process of key feature and digraph in embodiment；
Fig. 5 is flatness key feature instrumentation plan in embodiment；
Fig. 6 is the assembly precision simulation analysis result schematic diagram of target size in embodiment；
Fig. 7 is that embodiment medium sensitivity calculates schematic diagram；
Fig. 8 is front precision adjustment mechanism schematic diagram in embodiment；
Fig. 9 is front precision adjustment mechanism transition support schematic diagram in embodiment；
Figure 10 is the structural block diagram of present system.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
As shown in figure 1-9, the present embodiment the following steps are included:
(1) twin data acquisition, expression and processing
The twin data of crucial assembly process physics erecting yard are acquired, are handled, and by twin data information into
Row expression storage, can have the energy simulated according to twin data and twin model to actual physics assembling process
Power.Wherein twin data include with procedural information, the metrical information of key feature, tooling information.
The expression of assembling process, which is used, is described physics assembling process based on key feature and digraph, such as Fig. 2 institute
Show.Node indicates key feature, and side indicates size, geometric tolerances or assembly constraint, and wherein the starting point on side indicates reference characteristic, eventually
Point indicate target signature, dotted line indicate inside parts or completed assembly sub-assemblies inside size, geometric tolerances or
Assembly constraint, solid line indicate size, geometric tolerances or the assembly constraint to be realized after the completion of this road assembly process.With Fig. 3 mono-
For a assemble mechanism, which is assembled by pedestal 1 and motion arm 2 through peg-in-hole assembly and end face fitting, mechanical arm end
The Pose Control requirement at end is high, is the functional requirement FR of present case.According to components feature, geometric tolerances and assembly constraint,
Assembling process model as shown in Figure 4 can be established.For example, FE4 is the squareness tolerance that pedestal 1 installs axial end and axis
0.01, it is the constraint relationship of inside parts, and shaft hole matching constraint of the FE2 between motion arm 2 and pedestal 1.
Key feature is the geometrical characteristic of the part or components that have a significant impact to this road assembly process assembling quality, or
The related benchmark geometrical characteristic of assembly process assembling quality has a significant impact to this road positioning, clamping.Key feature measurement letter
Breath carries out data acquisition to key feature by digitized measurement equipment and analysis system, and to measurement data by noise spot
After the analyses such as reason, Data Integration, data compaction processing, pretreated measured data is obtained, to obtain the survey of key feature
Twin data are measured, and define technology using based on model, it is fixed that measurement is obtained dimensional tolerance, geometric tolerances, surface structure information
Justice is in the twin model of assembly process.
It is photogrammetric to be illustrated in figure 5 certain antenna array flatness key feature.Firstly, in each 3 central part of antenna house
Target 4 is first installed in position, is then measured with photogrammetry to entire antenna array, by the coordinate of each measurement point, intends
Conjunction obtains a plane, using this plane as datum plane, calculate each measurement point to the plane distance, highest point with it is minimum
Point arrives the sum of plan range, the as flatness of the plane.
By establishing the twin model of tooling, and by the actual geometry information of tooling, positioning is filled for the expression of tooling information
Folder precision information is defined in the twin model of tooling.
(2) the twin model construction of assembly process
Assembly process model is obtained in three-dimensional assembly technique designing system, and is based on twin data, to assembly process
Model is reconstructed, and generates the twin mould of assembly process that can merge erecting yard practical set situation and actual measurement information
Type realizes the depth integration of assembling process physical space and information space.The present embodiment assembly process model is assembled by three-dimensional
Process design system is generated and transferred to the assembly precision simulation analysis system twin based on number, is that this road assembly process is completed
It is formed by the threedimensional model corresponding to assembly processed afterwards, it is able to reflect assembling process and assemble sequence.Assembly process is twin
Raw model is by this road assembly process based on assembly physical entity processed, by real-time data acquisition, by physical space
In pass through synchronous actual situation mapping in entire assembly model processed, using twin data to three-dimensional assembly process model in information space
It is reconstructed and forms threedimensional model.
The reconstruct of assembly process model includes: that (21) are right according to the practical set sequence of assembly shop this procedure components
Assembly process Model Structure Tree components node sequence is adjusted, and can reflect assembling process information；(22) it uses original
The part geometry model and entire assembly model that ideal dimensions generate utilize the actual twin data-driven part geometry model of measurement
It is regenerated with entire assembly model；(23) frock clamp and its precision information used by this road assembly process is added, i.e., by work
Twin model is filled to be added in assembly process model.By handling above, the twin model of assembly process is constructed, realizes that digitlization is empty
The depth integration of the three-dimensional twin model of assembly process and real physical model under near-ring border.
(3) assembly process Simulation on Precision Analysis and Calculation of Sensitivity
The twin model of the assembly process of building is imported into commercialization assembly tolerance analysis software, such as TeamCenter
Visualization mockup dimensional tolerance analyzes software or CETOL TOLERANCE ANALYSIS software, defines the twin model of assembly process
Assembly constraint, determine simulation analysis target, determine components assemble sequence according to technological design result, and carry out emulation point
Analysis, determines the probability distribution graph of simulation objectives size, as shown in Figure 6, it is assumed that the quality that target size meets 3 δ when examining is wanted
It asks, then the qualification rate of target size assembly is 99.73%.Then meter sensitivity, sensitivity refer to certain size or geometric tolerances
To the influence degree of target size or geometric tolerances, sensitivity is higher, indicates the size or geometric tolerances to target assembly precision
It influences greatly, otherwise influences small.Be illustrated in figure 7 Calculation of Sensitivity as a result, the 1st influence of the size characteristic to target size most
Greatly, reach 61.68%.Therefore, in assembling process, the assembly precision of the priority control size characteristic is answered, and it is right to relax other
Target size influences the assembly precision of lesser size.
(4) online compensation of assembling process
According to assembly process Simulation on Precision Analysis as a result, controlling assembling process, including improve positioning, clamping essence
Degree, emphasis improve the size assembly precision of high sensitivity, reduce the low size assembly precision of sensitivity, or by adjusting mechanism
The measures such as precision controlling are carried out, to optimize assembling process, improve assembling quality.It is smart online to be illustrated in figure 8 certain radar front
Spend 5 schematic diagram of adjustment mechanism.The top of adjustment mechanism 5 is front basic module 6, and lower part is antenna frame 7, adjustment mechanism 5
Transition support is divided into lower seat 51, the seat of honour 52 and 53 3 layers of normal direction adjustment mechanism by from skeleton to the sequence of front basic module, such as
Shown in Fig. 9.Wherein normal direction adjustment mechanism 53 is a screw mechanism, only adjusts normal direction height, and upper bracket only adjusts X to spacing, and
Undersetting then not only adjusts Y-direction spacing, to be also adjusted to roll angle, inclination angle and azimuth.
As shown in Figure 10, the present embodiment based on the twin assembly precision analogue system of number, including it is physics assembly layer, twin
Raw data perception layer, twin model layer and prediction and optimization layer:
Physics assembles layer for complex product assembling activity, and physics assembly layer is primarily referred to as assembly shop objective reality
Physical entity set, such as assembly equipment, assembly tooling, measuring device, in assembly processed, it is responsible for executing the assembly in workshop
Production activity, and the data of physical space are provided, such as device data, personal information, environmental data.
Twin data perception layer realizes acquisition, processing and the fusion of physical layer Assembling Production data, by being deployed in assembly
The manufacture Internet of Things in workshop utilizes digital measurement device, PLC, sensor, RFID, laser tracker, photogrammetric and other intelligence
Equipment can be acquired, also include total station, three-dimensional coordinates measurement and other measurement methods, to the key feature during Assembling Production into
The acquisition of row data, and pretreatment and data fusion are carried out to the data got, number is provided for the analysis and prediction of assembly precision
According to support.
Twin model layer is the digitlization mirror image of physics assembly entity, including the twin model of assembly process, assembly environment be twin
Raw model, the twin model of assembly equipment, the twin model of assembly tool.Twin model layer is with the production of physics assembly shop solid modelling
Based on raw static models, by twin data perception layer, real-time data acquisition and monitoring, dynamically track physics assembly shop
Assembly shop physical entity in physical space is passed through synchronization by the working condition of the physical entities such as assembly equipment, tooling, tool
It is mapped in information space progress total factor and rebuilds the dummy model set to be formed.
Prediction optimization layer is to be assembled based on the core of the twin assembly precision simulation analysis of number based on twin data
Simulation on Precision Analysis and Calculation of Sensitivity, and the online compensation of assembling process is carried out according to simulation result and is precisely controlled, including
Positioning, clamping precision are improved, emphasis improves the size assembly precision of high sensitivity, reduces the low size assembly precision etc. of sensitivity
Measure, to realize the Intelligent closed-loop control of complex product assembling process.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (13)
1. a kind of assembly precision simulating analysis twin based on number, which comprises the following steps:
(1) twin data acquisition, expression and processing
The twin data of crucial assembly process physics erecting yard are acquired, are handled, and twin data information is subjected to table
Up to storage, it is made to have the ability simulated according to twin data and twin model to actual physics assembling process；
(2) the twin model construction of assembly process
Assembly process model is obtained in three-dimensional assembly technique designing system, and is based on twin data, to assembly process model
It is reconstructed, generates the twin model of assembly process of fusion erecting yard practical set situation and actual measurement information；
(3) assembly process Simulation on Precision Analysis and Calculation of Sensitivity
The twin model of the assembly process of building is imported into commercialization assembly tolerance analysis software, the twin mould of assembly process is defined
The assembly constraint of type determines simulation analysis target, determines components assemble sequence according to practical set sequence, and carry out emulation point
Analysis, determines the probability distribution graph of simulation objectives size, and check sensitivity data；
(4) online compensation of assembling process
According to assembly process Simulation on Precision Analysis as a result, controlling assembling process.
2. a kind of assembly precision simulating analysis twin based on number according to claim 1, which is characterized in that institute
It states in step (1), twin data include assembling process information, the metrical information of key feature, tooling information, the table of twin data
Up to expression, the metrical information expression of key feature, tooling information representation for including assembling process information.
3. a kind of assembly precision simulating analysis twin based on number according to claim 2, which is characterized in that institute
The expression for stating assembling process information, which is used, is described physics assembling process based on key feature and digraph: node indicates to close
Key feature, side indicate size, geometric tolerances or assembly constraint, and wherein the starting point on side indicates reference characteristic, and terminal indicates that target is special
Sign, dotted line indicate inside parts or have completed size, geometric tolerances or the assembly constraint inside the sub-assemblies assembled, solid line
Indicate this road assembly process size, geometric tolerances or the assembly constraint to be realized after the completion.
4. a kind of assembly precision simulating analysis twin based on number according to claim 2, which is characterized in that institute
State the geometrical characteristic that key feature is the part or components that have a significant impact to this road assembly process assembling quality, the road Huo Duizhe
The related benchmark geometrical characteristic of positioning, clamping that assembly process assembling quality has a significant impact.
5. a kind of assembly precision simulating analysis twin based on number according to claim 2, which is characterized in that institute
It states key feature metrical information and data acquisition is carried out to key feature by digitized measurement equipment and analysis system, and to measurement
After analysis processing of the data by noise spot processing, Data Integration, data compaction, pretreated measured data is obtained, thus
The twin data of measurement of key feature are obtained, and define technology using based on model, it is public that measurement is obtained dimensional tolerance, geometry
Difference, surface structure information are defined in the twin model of assembly process.
6. a kind of assembly precision simulating analysis twin based on number according to claim 2, which is characterized in that institute
The expression of tooling information is stated by establishing the twin model of tooling, and by the actual geometry information of tooling, is positioned, clamping precision
Information is defined in the twin model of tooling.
7. a kind of assembly precision simulating analysis twin based on number according to claim 1, which is characterized in that institute
It states in step (2), assembly process model is generated by three-dimensional assembly technique designing system, is institute after the completion of this road assembly process
The threedimensional model corresponding to assembly processed formed.
8. a kind of assembly precision simulating analysis twin based on number according to claim 1, which is characterized in that institute
State in step (2), the twin model of assembly process be by this road assembly process based on the physical entity of assembly processed, pass through
Data acquisition will pass through synchronous actual situation mapping in entire assembly model processed in physical space, using twin data in information space
In three-dimensional assembly process model be reconstructed and form threedimensional model.
9. a kind of assembly precision simulating analysis twin based on number according to claim 1, which is characterized in that institute
It states in step (2), the reconstruct to assembly process model includes:
(21) according to the practical set sequence of assembly shop this procedure components to assembly process Model Structure Tree components section
Dot sequency is adjusted, and can reflect assembling process information；
(22) to the part geometry model and entire assembly model originally generated with ideal dimensions, the actual twin data of measurement are utilized
Driving part geometry model and entire assembly model regenerate；
(23) frock clamp and its precision information used by this road assembly process is added, i.e., the twin model of tooling is added to dress
With in process model, by handling above, the twin model of assembly process is constructed, realizes three-dimensional assembler under digital virtual environment
The depth integration of the twin model of sequence and real physical model.
10. a kind of assembly precision simulating analysis twin based on number according to claim 1, which is characterized in that
In the step (3), Calculation of Sensitivity determine certain size or geometric tolerances to the influence degree of target size or geometric tolerances, from
And the position that emphasis coordinated control is needed in this process assembling process is grasped in advance, sensitivity is higher, indicates the size or geometry
Tolerance influences greatly target size assembly precision, otherwise influences small.
11. a kind of assembly precision simulating analysis twin based on number according to claim 1, which is characterized in that
In the step (4), it includes improving positioning, clamping precision that assembling process, which carries out control, and emphasis improves the size dress of high sensitivity
With precision, the low size assembly precision of sensitivity is reduced, or carries out precision controlling etc. by adjusting mechanism.
12. a kind of use the assembly precision simulating analysis twin based on number as claimed in any one of claims 1 to 11
The system emulated, which is characterized in that the system comprises physics assembly layer, twin data perception layer, twin model layer and
Prediction optimization layer；
Physics assembly layer is the physical entity set of objective reality in workshop, executes the Assembling Production in workshop and to information sky
Between data are provided；
The twin data perception layer utilizes digital measurement device, PLC, sensor, RFID by being deployed in the Internet of Things in workshop
With other intelligent acquisition equipment, the creation data of physics assembly layer is acquired, handled and merged, twin data are generated；
The twin model layer is the digitlization mirror image of physics assembly shop entity, including the twin model of assembly process, mounting ring
The twin model in border, the twin model of assembly equipment, the twin model of assembly tool；
The prediction optimization layer is based on twin data and carries out assembly precision simulation analysis and Calculation of Sensitivity, and according to simulation result
It carries out the online compensation of assembling process and is precisely controlled, realize the Intelligent closed-loop control of complex product assembling process.
13. a kind of assembly precision simulation analysis system twin based on number according to claim 12, which is characterized in that
The twin model layer is to pass through twin data perception based on the static models that physics assembly shop solid modelling generates
Layer, the work of the physical entities such as real-time data acquisition and monitoring, dynamically track physics assembly shop assembly equipment, tooling, tool
Assembly shop physical entity in physical space is carried out total factor and rebuilds to be formed by state by synchronization map in information space
Dummy model set.
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