CN111191395A - Nested model modeling method and equipment - Google Patents
Nested model modeling method and equipment Download PDFInfo
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- CN111191395A CN111191395A CN201911359055.0A CN201911359055A CN111191395A CN 111191395 A CN111191395 A CN 111191395A CN 201911359055 A CN201911359055 A CN 201911359055A CN 111191395 A CN111191395 A CN 111191395A
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- 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
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
Abstract
The embodiment of the invention discloses a modeling method of a nested model, which comprises the following steps: respectively establishing an integral structure plate rod model and a joint three-dimensional entity detail model; determining a connection plane on the overall structure plate-rod model; determining projection points of nail connection points on the joint three-dimensional entity detail model on the connection plane; establishing a connecting beam element between the projection point and the nail connecting point; modifying the connection area of the overall structure slab-rod model according to the connection beam element to obtain an updated connection area unit; and embedding the joint three-dimensional entity detail model into an integral structure slab-rod model by using the updated connection area unit.
Description
Technical Field
The present application relates to, but not limited to, the field of intensity computing technologies, and in particular, to a method and an apparatus for modeling a nested model.
Background
For a complex multi-joint connection structure between main structures of an airplane, the traditional connection simplified form cannot accurately simulate the rigidity and the boundary of a complex joint, and therefore the calculation precision is low. If the entity model is manually nested, time and labor are wasted, and errors are easy to occur.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention provides a nested model modeling method to solve the problem that the connection simplification form in the prior art cannot accurately simulate the rigidity and the boundary of a complex joint.
The first invention, the embodiment of the invention, provides a nested model modeling method, which includes:
respectively establishing an integral structure plate rod model and a joint three-dimensional entity detail model;
determining a connection plane on the overall structure plate-rod model;
determining projection points of nail connection points on the joint three-dimensional entity detail model on the connection plane;
establishing a connecting beam element between the projection point and the nail connecting point;
modifying the connection area of the overall structure slab-rod model according to the connection beam element to obtain an updated connection area unit;
and embedding the joint three-dimensional entity detail model into an integral structure slab-rod model by using the updated connection area unit.
Optionally, the determining a connection plane on the overall structure slab-rod model specifically includes:
selecting three non-collinear points in the connecting area of the integral structure slab-rod model;
determining a plane normal line by vector cross multiplication of the non-collinear three points;
and determining the connecting plane by combining the normal line of the plane and the coordinates of the three non-collinear points through a point-method equation.
Optionally, the determining a projection point of a nail connection point on the joint three-dimensional solid detail model on the connection plane specifically includes:
and respectively projecting N nail connection points on the joint three-dimensional entity detail model onto the connection plane along the direction of a plane normal line through a projection equation to obtain N projection point coordinates.
Optionally, the material properties of the connecting beam elements are consistent with the real connecting piece structure.
Optionally, the modifying, according to the connecting beam element, the connecting area of the overall structural slab-rod model to obtain an updated connecting area unit specifically includes:
deleting the original connecting area units on the overall structure plate-rod model;
and judging the unit where the projection point is located by an area equivalent method, and dividing the unit where the projection point is located to generate a new connecting area unit.
Optionally, the overall structure slab-rod model comprises a full-machine-plate shell model and a component slab-shell model.
Optionally, the method is implemented based on Python language.
A second invention, an embodiment of the present invention provides a nested model modeling apparatus, including: a memory and a processor;
the memory configured to hold executable instructions;
the processor, when executing the executable instructions held by the memory, is configured to implement a nested model modeling method as in any one of the above.
The method modifies the whole-airplane finite element model by defining the connection relationship between the complex joint and the airplane structure, embeds the complex three-dimensional solid joint model into the whole-airplane finite element model, accurately simulates the rigidity and boundary conditions of the complex joint, improves the accuracy of finite element calculation, and can meet the requirement that various three-dimensional solid joint models of the airplane are rapidly embedded into the whole-airplane shell model or the part plate shell model at present. And the method is applied to model work, so that the calculation accuracy of the joint strength is improved, the speed of structural parameter adjustment and strength calculation iteration is increased, the design period is shortened, and the workload of a designer is greatly reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic flowchart of a method for nesting a solid joint model according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a one-piece structural panel rod model provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a three-dimensional solid detail model of a joint according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a connection plane on a template for determining an integral structural slab provided in an embodiment of the present application;
fig. 5 is a schematic diagram of cell division according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The method mainly aims to solve the problem that the rigidity and the boundary of the complex joint between main structures of the airplane cannot be accurately simulated, improve the accuracy of nail load calculation of the complex joint and the connecting area of the complex joint, and realize the weight reduction of the structure. The method can solve the problem of complexity of manual modeling, improve the accuracy of joint strength calculation, accelerate the speed of structural parameter adjustment and strength calculation iteration, and shorten the design period.
Based on Python language, the process of embedding the three-dimensional solid joint model into the plate and rod model is optimized, and a set of three-dimensional solid joint rapid nesting plate and rod model technology is developed. The design flow is shown in FIG. 1.
The first step is as follows: respectively establishing an integral structure plate rod model and a joint three-dimensional entity detail model as shown in figures 2 and 3;
the second step is that: and determining a connecting plane on the overall structure plate rod model. Selecting three non-collinear points in the connecting area of the plate-rod model, and determining the plane normal (x) by vector cross multiplications,ys,zs) Determining the connection plane by means of a point-method equation, see equation (1)See FIG. 4;
xs(x-x0)+ys(y-y0)+zs(z-z0)＝0 (1)
the third step: and (5) projecting the nail connecting points on the joint three-dimensional entity detail model. Connecting points of the nail group on the three-dimensional solid model, projecting the connecting points to a connecting plane of the plate rod model along the normal direction of the plane (determined by the second step), and solving an equation (2) to obtain coordinates of the projection points;
the fourth step: and establishing a connecting beam element between the projection point and the nail point. Beam elements are established between the nail points on the solid model and the projection points on the plate rod model, connecting nails are simulated, and the material properties of the beam elements are consistent with the structure of a real connecting piece;
the fifth step: and (3) perfecting a plate-rod model connection area, deleting connection area units of a coarse grid on the plate-rod model, judging the unit where the nail connection point projection is located through an area equivalence method, dividing the unit where the nail connection point projection is located, and generating a new unit until no nail connection point projection remains in the unit. If the nail connection point deviates from the cell centroid by a large amount, a cell centroid node is created, thereby ensuring that the newly generated cell is not malformed. The cell division diagram is shown in fig. 5.
And (5) perfecting the connecting area structure of the plate rod model.
And a sixth step: and (4) quickly embedding the three-dimensional solid joint model into the full-machine plate shell model or the component plate shell model by using the new unit.
The method improves the accuracy of the nail load calculation of the complex joint and the connection area thereof, and realizes the weight reduction of the structure; and the problem of complexity of manual modeling can be solved, the calculation accuracy of the joint strength is improved, the speed of structural parameter adjustment and strength calculation iteration is accelerated, and the design cycle is shortened.
The inner vertical fin body plate rod model and the three-dimensional solid joint model are quickly connected through a model quick nesting technology, the efficiency is high, the structure is accurate, and the vertical fin body and the joint are nested into a finite element model.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method of modeling a nested model, the method comprising:
respectively establishing an integral structure plate rod model and a joint three-dimensional entity detail model;
determining a connection plane on the overall structure plate-rod model;
determining projection points of nail connection points on the joint three-dimensional entity detail model on the connection plane;
establishing a connecting beam element between the projection point and the nail connecting point;
modifying the connection area of the overall structure slab-rod model according to the connection beam element to obtain an updated connection area unit;
and embedding the joint three-dimensional entity detail model into an integral structure slab-rod model by using the updated connection area unit.
2. The method according to claim 1, wherein the determining the connection plane on the model of the monolithic structural slab-rod comprises:
selecting three non-collinear points in the connecting area of the integral structure slab-rod model;
determining a plane normal line by vector cross multiplication of the non-collinear three points;
and determining the connecting plane by combining the normal line of the plane and the coordinates of the three non-collinear points through a point-method equation.
3. The method according to claim 1, wherein the determining a projection point of a nail connection point on the joint three-dimensional solid detail model on the connection plane specifically comprises:
and respectively projecting N nail connection points on the joint three-dimensional entity detail model onto the connection plane along the direction of a plane normal line through a projection equation to obtain N projection point coordinates.
4. A method according to claim 1, wherein the material properties of the connecting beam elements are consistent with the true connector structure.
5. The method according to claim 1, wherein the modifying the connection area of the overall structural slab-and-beam model according to the connection beam element to obtain an updated connection area unit comprises:
deleting the original connecting area units on the overall structure plate-rod model;
and judging the unit where the projection point is located by an area equivalent method, and dividing the unit where the projection point is located to generate a new connecting area unit.
6. The method of claim 1, wherein the integrated structural slab spar model comprises a full panel shell model and a part panel shell model.
7. The method according to claim 1, wherein the method is implemented based on Python language.
8. A nested model modeling apparatus, comprising: a memory and a processor;
the memory configured to hold executable instructions;
the processor, when executing the executable instructions held by the memory, is configured to implement the nested model modeling method of any of claims 1-7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112182798A (en) * | 2020-09-11 | 2021-01-05 | 厦门大学 | Grid construction method and structure of connecting component embedded into plate structure |
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| US20190137972A1 (en) * | 2017-11-06 | 2019-05-09 | Abemis LLC | Method and system to generate three-dimensional meta-structure model of a workpiece |
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| US20190137972A1 (en) * | 2017-11-06 | 2019-05-09 | Abemis LLC | Method and system to generate three-dimensional meta-structure model of a workpiece |
Non-Patent Citations (2)
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| 刘雪锋等: "结构连接节点刚度识别的精细有限元分析", 《中外公路》 * |
| 谭景磊等: "基于Patran的复杂薄壁结构有限元建模及细节分析方法研究", 《飞机设计》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112182798A (en) * | 2020-09-11 | 2021-01-05 | 厦门大学 | Grid construction method and structure of connecting component embedded into plate structure |
| CN112182798B (en) * | 2020-09-11 | 2022-06-21 | 厦门大学 | Grid construction method and structure of connecting component embedded into plate structure |
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