CN117057035A - Air duct three-dimensional modeling system and method based on 3DE - Google Patents
Air duct three-dimensional modeling system and method based on 3DE Download PDFInfo
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Abstract
The invention relates to a three-dimensional modeling system and method of an air duct based on 3DE, which integrate a design preparation stage and a modeling flow through tools, so that a designer can complete the whole process design work in one platform, a more efficient, convenient and standardized three-dimensional air duct design flow is formed, and the modeling efficiency of the designer is improved; the standardization degree of wind pipe modeling can be further improved, the wind pipe, accessory node types and port types are standardized, a complete component engineering connection relationship can be established, and parameter naming standards are beneficial to model design information transmission and checking; the invention realizes parameterized modeling and associated updating of the air duct accessories, and can enable the air duct accessories to be updated in batch in an adapting way according to the air duct size adjustment by a tool, thereby reducing the reworking quantity of modification. And a ventilation accessory is searched from the air pipe, so that a data association mechanism of the 3DE model is effectively applied. The operation of creating the external link parameters can realize synchronous update of the accessories; the operation of the parameters can realize synchronous updating of the accessories.
Description
Technical Field
The invention relates to a ship digital design technology, in particular to a 3 DE-based air duct three-dimensional modeling system and method.
Background
The air duct is an important component of a ventilation and air-conditioning system, a designer reasonably determines the size of the air duct through design calculation on the premise of ensuring required air quantity distribution according to the design conditions in the current design flow, and the air duct arrangement is performed based on background information on the basis. The traditional two-dimensional design means is time-consuming and easy to express, and the design characteristics and arrangement conditions of the air duct system can be completely reflected by means of the digital means, so that the production and construction are guided finally. However, the existing digital modeling means does not integrate design preparation work before air duct modeling, and reduces the efficiency of air duct three-dimensional design.
At present, a 3DE platform (3D digital collaborative design based on cloud) has a very high collaborative work function, gradually becomes a mainstream three-dimensional design platform used by a design building unit, and a primary air pipe module, namely an HVAC air pipe design module, of the three-dimensional design platform can realize modeling and arrangement of a system model, but has the following problems: 1) The air pipe modeling, the dimension input of which needs earlier design and setting, has lower efficiency; 2) According to project requirements, a specification is customized and configured in the background in advance, so that the availability of the module is reduced; 3) The ventilation accessory is required to be selected in advance according to the size of the air pipe, so that the lofting efficiency is reduced; 4) Once the background information is changed, the size of the air duct is adjusted, and the model modification reworking amount is large.
Disclosure of Invention
Aiming at the problems existing in the 3D modeling of the air duct design, the air duct three-dimensional modeling system and method based on the 3DE are provided, and the air duct modeling efficiency is further improved.
The technical scheme of the invention is as follows: a3 DE-based air duct three-dimensional modeling system comprises an accessory small sample library, an air duct calculation module and an accessory global updating module;
the accessory small sample library is used for providing various types of air pipe elbows, tee joints and ventilation accessories, and various small samples are modeled by adopting standard parameterization;
the air duct calculation module comprises a design input unit, an air duct size calculation unit and an air duct modification unit; the design input unit provides calculation input for the air duct size calculation module, and design input parameter sources are divided into two parts: 1) Background information pick-up, 2) designer design input;
the air duct size calculating unit is used for calculating the air duct size and providing recommended size for designers;
the air pipe modification unit is used for quickly modifying the size of the air pipe model with the trend arrangement completed;
the accessory global updating module is used for automatically updating all the sizes of the accessory models inserted into the ventilation pipeline in batches.
A3 DE-based air duct three-dimensional modeling method establishes the 3 DE-based air duct three-dimensional modeling system, and the modeling steps are as follows:
step 1, preliminary arrangement of air pipes: based on the background information of the cabin structure, the arrangement of an air pipe model, namely the trend of the air pipe, is planned according to design requirements, an established small accessory sample library is called according to requirements during the arrangement of the air pipe model, and ventilation accessories are inserted to complete the trend arrangement of the ventilation pipeline;
step 2, acquiring relevant information of an air duct arrangement cabin through a design input unit in an air duct calculation module;
step 3, the designer inputs parameters in the design input unit according to the design requirement, and simultaneously selects the type of the air duct; step 4, according to the design input in the step 2 and the step 3, the air duct size calculating unit outputs an air duct size recommended value and an actual flow velocity in the air duct for reference of a designer, and the designer can select the reference value and also can input the air duct size in a self-defining manner;
step 5, on the basis of completing the step 4, a designer can pick up the air duct model arrangement corresponding to the step 1 through an air duct modification unit, and update of the air duct model size can be completed;
step 6, carrying out self-defined modification, namely picking up air pipe model arrangement by using an air pipe modification unit to obtain air pipe model arrangement corresponding information, and directly modifying the size to finish the corresponding air pipe model size modification;
and 7, globally updating the ventilation accessories, automatically adapting the accessories in batches according to the types of the accessories in the system, and completing modeling.
Further, the ventilation volume is calculated by the ventilation pipe size calculating unit in the step 4 according to the following two calculation methods according to the specification and rule requirements for different cabins, the maximum value of the two calculation methods is taken as the determined air volume, and the recommended value of the air pipe size is given according to the determined air volume and the type of the input air pipe;
first kind: ventilation is calculated according to the ventilation times per hour:
q v1 ＝n 1 ×V 1 wherein q v1 Is the ventilation quantity (m 3/h), n 1 The ventilation times (times/h), V 1 Is a bilge;
second kind: calculated according to heat:
wherein q v2 Air quantity (m 3/h) and Q required for taking away heat dissipation capacity 2 For the heat dissipation capacity (kW) of the cabin ρ a For air density, 1.2kg/m3, c a For the specific heat capacity of air, 1.005 kJ/(kg.K), deltaT was taken 2 Is the difference (K) between the supply air temperature and the cabin temperature.
Further, the specific step of global updating of the ventilation accessory in the step 7 is as follows:
1) Accessory hand sample library: when the air pipe accessory small sample template is modeled, according to the modeling rule of the 3DE platform, the node type is used in a standardized mode, the modeling coordinate system is standardized, the port is created, the port geometric parameter naming is standardized, and meanwhile, the organization structure tree is standardized;
2) Creating external link parameters: creating an external link parameter in the accessory according to the size of the air pipe, and establishing an equality relation between the size parameter of the accessory and the external link parameter;
3) And (5) searching: and reading whether accessories of the updating type are selected at the two ends of the air pipe, and synchronously updating the sizes of the accessories while updating the sizes of the air pipes according to the equation relation of the external link parameters.
Further, modeling the coordinate system in step 1): when the accessory is modeled, the coordinate system of the accessory meets the following requirements:
the first axis direction and the Z axis direction are the main directions of the accessory;
the negative direction of the second axis and the X axis is the direction of a branch pipe of the pipe fitting;
the third, non-coaxial appendage is offset along the X-axis.
Further, the step 1) creates a port: the type is "HVAC Port", and the ductwork accessory Port should be located on its own contact plane with the plumbing connection, oriented perpendicular to the contact plane, and toward the target plumbing being connected.
Further, in the step 1), the tree structure is: constructing each air duct accessory small sample model, carrying out light modeling or Part Design by adopting GSD in a 3DE platform, generating a corresponding structure tree of each air duct accessory small sample after modeling, inserting new geometric figure set nodes on the structure tree by utilizing a primary function, carrying out standardized naming, and unifying naming rules of all air duct accessory small samples.
Further, the GSD performs lightweight modeling, and 3 geometric figure sets, namely "modeling process element", "model geometry" and "port information", are required to be created, and are used for storing the modeling process element, model appearance geometry and port information respectively.
Further, the Part Design performs solid modeling, and needs to create "modeling process elements", "model geometry" and "port information" for storing the modeling process elements, model contour geometry and port information, where "modeling process elements" and "port information" are geometry sets, and "model geometry" is an ordered geometry set.
The invention has the beneficial effects that: according to the air duct three-dimensional modeling system and method based on 3DE, the design preparation stage and the modeling flow are integrated through the tool, so that a designer can complete the whole process design work in one platform, a more efficient, convenient and standardized air duct three-dimensional design flow is formed, and the modeling efficiency of the designer is improved; the standardization degree of wind pipe modeling can be further improved, the wind pipe, accessory node types and port types are standardized, a complete component engineering connection relationship can be established, and parameter naming standards are beneficial to model design information transmission and checking; the invention realizes parameterized modeling and associated updating of the air duct accessories, and can enable the air duct accessories to be updated in batch in an adapting way according to the air duct size adjustment by a tool, thereby reducing the reworking quantity of modification. And a ventilation accessory is searched from the air pipe, so that a data association mechanism of the 3DE model is effectively applied. The operation of creating the external link parameters can realize synchronous update of the accessories; the operation of the parameters can realize synchronous updating of the accessories.
Drawings
FIG. 1 is a flow chart of a fast modeling scheme of an air duct in a 3 DE-based air duct three-dimensional modeling method of the invention;
FIG. 2 is a schematic diagram of the calculation of the air duct size in the 3 DE-based air duct three-dimensional modeling method of the present invention;
FIG. 3 is a schematic representation of a tree hierarchy of the model structure of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
The air duct size selection algorithm is integrated into a tool background by the air duct three-dimensional modeling method based on 3DE, so that air duct size quick selection, model size modification and air duct information extraction are realized. In addition, aiming at the characteristics of multiple types, multiple specifications and the like of the air duct accessories, the ventilation accessory template is remapped by utilizing a parameterized modeling method, and the standardized modeling specification is formulated, so that after the air duct accessories are arranged, a user can adaptively modify the sizes of the accessories in batches by using a program, and the air duct modeling is efficiently completed.
A3 DE-based air duct three-dimensional modeling system is established, and the system comprises an accessory small sample library, an air duct calculation module and an accessory global updating module.
The accessory small sample library is used for providing various types of air pipe elbows, tee joints and ventilation accessories, various small samples are modeled by standard parameters, and global one-key updating of the later small samples is facilitated;
the air duct calculation module comprises a design input unit, an air duct size calculation unit and an air duct modification unit.
The design input unit provides calculation input for the air duct size calculation module, and design input parameter sources are divided into two parts: 1) Background information pickup such as bilge, ventilation times, heating value and the like; 2) Designer design inputs such as flow rate, wall thickness, etc.;
the air duct size calculating unit is used for calculating the air duct size and providing recommended size for designers, and the air duct modifying unit is used for quickly modifying the size of the air duct model with the trend arrangement completed;
the accessory global updating module is used for automatically updating all the sizes of the accessory models inserted into the ventilation pipeline in batches.
Figure 1 is a flow chart of a fast modeling scheme of an air duct in a three-dimensional modeling design method of the air duct based on 3DE,
1. fast modeling of the air duct:
step 1, preliminary arrangement of air pipes: based on cabin structure background information (such as aggregate, bulkhead and the like), air pipe model arrangement is planned according to design requirements, namely the trend of the air pipes, an established small accessory sample library is called according to requirements during the air pipe model arrangement, ventilation accessories are inserted, and the trend arrangement of the ventilation pipelines is completed;
step 2, acquiring relevant information of an air duct arrangement cabin, such as cabin volume, ventilation times, heating value and the like, through a design input unit in an air duct calculation module;
step 3, a designer inputs parameters such as flow speed, wall thickness and the like in a design input unit according to design requirements, and simultaneously selects an air pipe type;
and step 4, according to the design input in the step 2 and the step 3, the air duct size calculation unit outputs an air duct size recommended value and an actual flow velocity in the air duct for reference of a designer, and the designer can select the reference value and also can input the air duct size in a self-defining manner.
The air duct size calculation schematic diagram is shown in fig. 2, the air volume is calculated according to the following two calculation methods according to the specification and rule requirements for different cabins, the maximum value of the two calculation methods is taken as the determined air volume, and the air duct size recommended value is given according to the determined air volume and the type of the input air duct.
1) Ventilation is calculated according to the ventilation times per hour:
q v1 ＝n 1 ×V 1 wherein q v1 Is the ventilation quantity (m 3/h), n 1 The ventilation times (times/h), V 1 Is a bilge.
2) Calculated according to heat:
wherein q v2 Air quantity (m 3/h) and Q required for taking away heat dissipation capacity 2 For the heat dissipation capacity (kW) of the cabin ρ a For air density, 1.2kg/m3, c a For the specific heat capacity of air, 1.005 kJ/(kg.K), deltaT was taken 2 Is the difference (K) between the supply air temperature and the cabin temperature.
And 5, on the basis of completing the step 4, a designer can pick up the air duct model arrangement corresponding to the step 1 through an air duct modification unit, and can complete the updating of the air duct model size.
And 6, carrying out self-defined modification, namely picking up air pipe model arrangement by using an air pipe modification unit to obtain air pipe model arrangement corresponding information, and directly modifying the size to finish the corresponding air pipe model size modification.
2. Ventilated attachment global updates
The ventilation accessories are globally updated, and the programs can automatically adapt to the accessories in batches according to the types of the accessories in the system. The specific implementation flow is as follows:
1. accessory hand sample library: when the air pipe accessory small sample template is modeled, according to the 3DE platform modeling rule, the node type is used in a standardized mode, the modeling coordinate system is standardized, the Port (Port) is created, the Port geometric parameter naming is standardized, and meanwhile the organization structure tree is standardized. Accessory types are as follows: tee, reducing, ventilation grating, etc.
1.1, modeling coordinate system: when the accessory is modeled, the coordinate system of the accessory meets the following requirements:
1. the Z-axis direction is the main direction of the accessory;
2. the X-axis negative direction is the direction of a branch pipe of the pipe accessory;
3. the non-coaxial accessory is offset along the X-axis direction;
1.2, port: the type is "HVAC Port", the duct attachment Port should be located on its own contact plane with the duct connection, oriented perpendicular to the contact plane, and oriented toward the connected target duct, the Port naming requirements being as follows:
1.2.1 accessory Port naming Format "Port" + numbering, numbering should start from 1
1.2.2 for accessories with multiple ports (e.g. tee, etc.), the ports should be named Port1, port2, and the branch ports Port3.
1.2.3, port size parameter naming should be able to accurately convey its meaning, the invention takes the form of "geometric meaning" and "port number" combination naming,
taking tee as an example, its port size parameters are named in the following table.
| Sequence number | Parameter name | Parameter type | Parameter description |
| 1 | W1 | Length | Port1 Port outer width |
| 2 | H1 | Length | Port1 Port out-of-height |
| 3 | W2 | Length | Port2 Port outer width |
| 4 | H2 | Length | Port2 Port out-of-height |
| 5 | W3 | Length | Port3 Port outer width |
| 6 | H3 | Length | Port3 Port out-of-height |
| 7 | Thickness | Length | Port wall thickness |
1.3 structural Tree
The model structure tree is a tree structure for describing model data, when each air duct accessory small sample model is constructed, GSDs in a 3DE platform can be adopted for carrying out light modeling or Part Design for carrying out entity modeling, after modeling, a corresponding structure tree of each air duct accessory small sample is generated, then a new geometric figure set node is inserted into the structure tree by utilizing a native function, standardized naming is carried out, and naming rules of all air duct accessory small samples are unified. When GSD modeling is adopted, 3 geometric sets (geometric Set) of modeling process elements, model geometry and port information are required to be created; when modeling with Part Design, the "model geometry" is replaced by a Geometrical Set to Ordered Geometrical Set (ordered Set of geometries), without using "PartBudy", and the rest unchanged. The 3 geometry sets are used to store modeling process elements, model outline geometry, and port information, respectively.
Each set of geometries must follow the following rules:
storing sketches, auxiliary points, lines, planes and other characteristics in modeling process elements, and hiding the geometric graph set after modeling;
features outside the range of device geometry cannot be stored in the "model geometry";
the structural tree needs to be kept complete, and if no related information geometric figure set is available;
the naming of the geometric figure set is unchanged;
modeling auxiliary information such as a coordinate system/auxiliary line and the like should be hidden except special requirements;
the model structure tree hierarchy is shown in fig. 3: the standardized management of the model geometric data is realized, and a data base is provided for the application of various subsequent development tools.
2. Creating external link parameters: external linking parameters such as hvac_h1, hvac_w1, hvac_therkness 1 (wall Thickness) are created in the accessory according to the duct size, and an equality relationship of the accessory size parameters W1, H1, therkness with the external linking parameters is established.
3. And (5) searching: by reading whether accessories of the updating type are selected at the two ends of the air pipe or not, the synchronous updating of the sizes of the accessories can be completed when the sizes of the air pipes are updated according to the equation relation of the external link parameters.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The 3 DE-based air duct three-dimensional modeling system is characterized by comprising an accessory small sample library, an air duct calculation module and an accessory global updating module;
the accessory small sample library is used for providing various types of air pipe elbows, tee joints and ventilation accessories, and various small samples are modeled by adopting standard parameterization;
the air duct calculation module comprises a design input unit, an air duct size calculation unit and an air duct modification unit; the design input unit provides calculation input for the air duct size calculation module, and design input parameter sources are divided into two parts: 1) Background information pick-up, 2) designer design input;
the air duct size calculating unit is used for calculating the air duct size and providing recommended size for designers;
the air pipe modification unit is used for quickly modifying the size of the air pipe model with the trend arrangement completed;
the accessory global updating module is used for automatically updating all the sizes of the accessory models inserted into the ventilation pipeline in batches.
2. A 3 DE-based air duct three-dimensional modeling method, which is characterized by establishing the 3 DE-based air duct three-dimensional modeling system according to claim 1, wherein the modeling steps are as follows:
step 1, preliminary arrangement of air pipes: based on the background information of the cabin structure, the arrangement of an air pipe model, namely the trend of the air pipe, is planned according to design requirements, an established small accessory sample library is called according to requirements during the arrangement of the air pipe model, and ventilation accessories are inserted to complete the trend arrangement of the ventilation pipeline;
step 2, acquiring relevant information of an air duct arrangement cabin through a design input unit in an air duct calculation module;
step 3, the designer inputs parameters in the design input unit according to the design requirement, and simultaneously selects the type of the air duct;
step 4, according to the design input in the step 2 and the step 3, the air duct size calculating unit outputs an air duct size recommended value and an actual flow velocity in the air duct for reference of a designer, and the designer can select the reference value and also can input the air duct size in a self-defining manner;
step 5, on the basis of completing the step 4, a designer can pick up the air duct model arrangement corresponding to the step 1 through an air duct modification unit, and update of the air duct model size can be completed;
step 6, carrying out self-defined modification, namely picking up air pipe model arrangement by using an air pipe modification unit to obtain air pipe model arrangement corresponding information, and directly modifying the size to finish the corresponding air pipe model size modification;
and 7, globally updating the ventilation accessories, automatically adapting the accessories in batches according to the types of the accessories in the system, and completing modeling.
3. The 3 DE-based air duct three-dimensional modeling method according to claim 2, wherein the air duct size calculation unit in the step 4 calculates the air volume according to the following two calculation methods according to the specification and the rule requirements for different cabins, takes the maximum value of the two calculation methods as the determined air volume, and gives an air duct size recommended value according to the determined air volume and the type of the input air duct;
first kind: ventilation is calculated according to the ventilation times per hour:
q v1 ＝n 1 ×V 1 wherein q v1 Is the ventilation quantity (m 3/h), n 1 The ventilation times (times/h), V 1 Is a bilge;
second kind: calculated according to heat:
wherein q v2 Air quantity (m 3/h) and Q required for taking away heat dissipation capacity 2 For the heat dissipation capacity (kW) of the cabin ρ a For air density, 1.2kg/m3, c a For the specific heat capacity of air, 1.005 kJ/(kg.K), deltaT was taken 2 Is the difference (K) between the supply air temperature and the cabin temperature.
4. 3 DE-based air duct three-dimensional modeling method according to claim 2, wherein the specific steps of global updating of ventilation accessories in step 7 are as follows:
1) Accessory hand sample library: when the air pipe accessory small sample template is modeled, according to the modeling rule of the 3DE platform, the node type is used in a standardized mode, the modeling coordinate system is standardized, the port is created, the port geometric parameter naming is standardized, and meanwhile, the organization structure tree is standardized;
2) Creating external link parameters: creating an external link parameter in the accessory according to the size of the air pipe, and establishing an equality relation between the size parameter of the accessory and the external link parameter;
3) And (5) searching: and reading whether accessories of the updating type are selected at the two ends of the air pipe, and synchronously updating the sizes of the accessories while updating the sizes of the air pipes according to the equation relation of the external link parameters.
5. The 3 DE-based air duct three-dimensional modeling method according to claim 4, wherein the modeling coordinate system in step 1) is as follows: when the accessory is modeled, the coordinate system of the accessory meets the following requirements:
the first axis direction and the Z axis direction are the main directions of the accessory;
the negative direction of the second axis and the X axis is the direction of a branch pipe of the pipe fitting;
the third, non-coaxial appendage is offset along the X-axis.
6. The 3 DE-based air duct three-dimensional modeling method according to claim 4, wherein the creating of the port in the step 1) is: the type is "HVAC Port", and the ductwork accessory Port should be located on its own contact plane with the plumbing connection, oriented perpendicular to the contact plane, and toward the target plumbing being connected.
7. The 3 DE-based air duct three-dimensional modeling method according to claim 4, wherein the structural tree in step 1): constructing each air duct accessory small sample model, carrying out light modeling or Part Design by adopting GSD in a 3DE platform, generating a corresponding structure tree of each air duct accessory small sample after modeling, inserting new geometric figure set nodes on the structure tree by utilizing a primary function, carrying out standardized naming, and unifying naming rules of all air duct accessory small samples.
8. The 3 DE-based air duct three-dimensional modeling method according to claim 7, wherein the GSD performs light modeling, and 3 geometric figure sets of "modeling process element", "model geometry" and "port information" are required to be created, and are used for storing the modeling process element, model outline geometry and port information, respectively.
9. The 3 DE-based air duct three-dimensional modeling method according to claim 8, wherein the Part Design performs solid modeling, and "modeling process element", "model geometry" and "port information" are required to be created, and are respectively used for storing the modeling process element, the model outline geometry and the port information, wherein "modeling process element" and "port information" are geometry sets, and "model geometry" is an ordered geometry set.
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