CN107194079B - Pixel subdivision load transfer method and system - Google Patents
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Abstract
The invention relates to a pixel subdivision load transfer method and a system. The pixel subdivision load transfer method comprises the following steps: acquiring surface pressure distribution data in the form of surface elements and corresponding pressures; subdividing the bin pixels into sufficiently small subdivided bins; distributing subdivision elements to corresponding structure bearing points; dividing the subdivision elements distributed to the same structure bearing point into concentration force and moment, and transmitting the concentration force and the moment to the structure bearing point; comparing the load distribution before and after transmission to obtain a difference value, and judging whether the difference value is smaller than a given tolerance; if the difference is less than a given tolerance, a final load is obtained; if the difference is greater than or equal to a given tolerance, pixel subdivision is continued on the face element and subsequent steps are repeated until a final load is obtained. The pixel subdivision load transfer method and the pixel subdivision load transfer system have the following beneficial technical effects: the pneumatic surface load is transferred to the structural node, and the front and back conservative property of the transfer and the accurate matching of the load distribution are realized.
Description
Technical Field
The invention relates to a pixel subdivision load transfer method and a pixel subdivision load transfer system, and belongs to the field of aeroelasticity of airplanes.
Background
Before it comes to the design of products where the shape receives hydrodynamic pressure while there is structural load on the interior, it is necessary to evaluate the various external hydrodynamic loads that the interior structure may be subjected to. Aircraft are one of this type of products.
Computational fluid dynamics assessment of external fluid dynamics typically employs computational fluid dynamics analysis or wind tunnel test models to form a grid for fluid dynamics analysis. Force data is stored on each grid cell.
And carrying out structural dynamics modeling on the internal structure to form a structural finite element model. The form of the structural finite elements does not match the mesh used for fluid mechanics analysis at all. The load transfer function is to convert the force on the pneumatic surface element into the force on the structural finite element node, and the force and moment conservation is required to be ensured before and after the conversion, and the force and moment distribution is basically consistent.
The existing load transfer process generally has the following methods.
The mapping method comprises the following steps: the automatic matching structure unit and the pneumatic unit are used for transmission according to spatial positions, and the defect is that when the difference between the structure and the pneumatic interface grids is large, energy conservation is difficult to guarantee.
Secondly, an interpolation method: all the structural units and the pneumatic units participate in three-dimensional interpolation, the automation degree is high, energy conservation can be guaranteed in the boundary load transfer process, and the defect that the moment distribution is difficult to keep consistent before and after transfer under the condition of the wings of the airplane with the large aspect ratio is overcome. The method can adopt a partitioning method to improve the consistency before and after transmission, but when more moving surfaces exist on the wing, the load transmission of the part is difficult to carry out only through plane division.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the existing load transfer methods and systems and to provide a new load transfer method and system that enables transfer of aerodynamic surface loads to structural nodes and achieves pre-and post-transfer conservation and accurate matching of load distribution.
The above object of the present invention is achieved by a pixel subdivision load transfer method, comprising:
acquiring surface pressure distribution data in the form of surface elements and corresponding pressures;
subdividing the bin pixels into sufficiently small subdivision bins;
distributing the subdivision elements to corresponding structure bearing points;
dividing the subdivision elements distributed to the same structure bearing point into concentration force and moment, and transmitting the concentration force and the moment to the structure bearing point;
comparing the load distribution before and after transmission to obtain a difference value, and judging whether the difference value is smaller than a given tolerance;
-obtaining a final load if said difference is less than a given tolerance;
in case the difference is greater than or equal to a given tolerance, the pixel subdivision is continued for the face element and the subsequent steps are repeated until the final load is obtained.
According to the technical scheme, the pixel subdivision load transfer method can achieve the following beneficial technical effects: the pneumatic surface load is transferred to the structural node, and the front and back conservative property of the transfer and the accurate matching of the load distribution are realized.
Preferably, the surface pressure distribution data is obtained by computational fluid dynamics analysis or wind tunnel testing.
Preferably, the pixel subdivision is a pixelization partition by geometric centroid.
Preferably, each subdivision element is assigned to a corresponding structure bearing point.
Preferably, the pixel subdivision load transfer method further includes: the structure bearing points are grouped before subdividing the bin pixels into sufficiently small subdivision bins.
The above object of the present invention is also achieved by a pixel sub-division load transfer system comprising:
a data acquisition module configured to acquire surface pressure distribution data in the form of bins and their corresponding pressures;
a pixel subdivision module configured to subdivide the bins of pixels into sufficiently small subdivided bins;
a binning module configured to assign the sub-bins to corresponding structural load bearing points;
an integral transfer module configured to integrate the subdivision elements assigned to the same structure bearing point into a concentration force and a moment, and to transfer the concentration force and the moment to the structure bearing point;
a comparison and judgment module configured to compare the load distributions before and after transfer to obtain a difference value, and judge whether the difference value is smaller than a given tolerance; -obtaining a final load if said difference is less than a given tolerance; in case the difference is greater than or equal to a given tolerance, the pixel subdivision module, bin assignment module and integrate-and-transfer module are used to continue processing of the bins until a final load is obtained.
According to the technical scheme, the pixel subdivision load transfer system can achieve the following beneficial technical effects: the pneumatic surface load is transferred to the structural node, and the front and back conservative property of the transfer and the accurate matching of the load distribution are realized.
Preferably, the surface pressure distribution data is obtained by computational fluid dynamics analysis or wind tunnel testing.
Preferably, the pixel subdivision is a pixelization partition by geometric centroid.
Preferably, the binning module is configured to assign each sub-bin to a corresponding structural load carrying point.
Preferably, the pixel subdivision load transfer system further comprises a structure bearing point grouping module configured to: the structure bearing points are grouped before subdividing the bin pixels into sufficiently small subdivision bins.
Drawings
Fig. 1 is a flowchart of a pixel subdivision load transfer method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a pixel subdivision load transfer system in accordance with an embodiment of the present invention.
FIG. 3 is a schematic view of the wing mechanism and aerodynamic profile of an embodiment of the present invention.
Fig. 4 is a schematic diagram of a grouping matching relationship of a pixel subdivision load transfer method according to an embodiment of the present invention.
Fig. 5 is a pixel subdivision schematic diagram of a pixel subdivision load transfer method according to an embodiment of the present invention.
List of reference numerals
1. Slat aerodynamic surface
2. Flap aerodynamic surface
3. Aerodynamic surface of main wing
4. Slat structural component
5. Flap structural member
6. Main wing structural component
D. Dispensing arrow
Detailed Description
While specific embodiments of the invention will be described below, it should be noted that in the course of the detailed description of these embodiments, in order to provide a concise and concise description, all features of an actual implementation may not be described in detail. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions are made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be further appreciated that such a development effort might be complex and tedious, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as a complete understanding of this disclosure.
Unless otherwise defined, technical or scientific terms used in the claims and the specification should have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "a" or "an," and the like, do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalent, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, nor are they restricted to direct or indirect connections.
Fig. 1 is a flowchart of a pixel subdivision load transfer method according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a pixel subdivision load transfer system in accordance with an embodiment of the present invention. FIG. 3 is a schematic view of the wing mechanism and aerodynamic profile of an embodiment of the present invention. Fig. 4 is a schematic diagram of a grouping matching relationship of a pixel subdivision load transfer method according to an embodiment of the present invention. Fig. 5 is a pixel subdivision schematic diagram of a pixel subdivision load transfer method according to an embodiment of the present invention.
As shown in fig. 1, the pixel subdivision load transfer method according to the present invention comprises:
acquiring surface pressure distribution data in the form of surface elements and corresponding pressures;
subdividing the bin pixels into sufficiently small subdivided bins;
distributing subdivision elements to corresponding structure bearing points;
dividing the subdivision elements distributed to the same structure bearing point into concentration force and moment, and transmitting the concentration force and the moment to the structure bearing point;
comparing the load distribution before and after transmission to obtain a difference value, and judging whether the difference value is smaller than a given tolerance;
if the difference is less than a given tolerance, a final load is obtained;
if the difference is greater than or equal to a given tolerance, pixel subdivision is continued on the face element and subsequent steps are repeated until a final load is obtained.
Therefore, the pixel subdivision load transfer method can transfer the pneumatic surface load to the structural node, and realize the conservative property before and after transfer and the accurate matching of load distribution.
Preferably, the surface pressure distribution data is obtained by computational fluid dynamics analysis or wind tunnel testing.
Preferably, the pixel subdivision is a pixelized subdivision by geometric centroid. The number of equal fractions depends on the bin shape type.
Preferably, each subdivision element is assigned to a corresponding structure bearing point. That is, any subdivision element cannot be dropped to participate in load transfer.
Preferably, the pixel subdivision load transfer method further includes: the structure bearing points are grouped before the binning pixels are subdivided into sufficiently small subdivision bins.
As shown in fig. 2, a pixel subdivision load transfer system according to the invention comprises:
a data acquisition module configured to acquire surface pressure distribution data in the form of bins and their corresponding pressures;
a pixel subdivision module configured to subdivide the bins of pixels into sufficiently small subdivided bins;
a binning assignment module configured to assign subdivision bins to corresponding structural load bearing points;
the integral transmission module is configured to integrate the subdivision elements distributed to the same structure bearing point into a concentration force and a moment and transmit the concentration force and the moment to the structure bearing point;
the comparison and judgment module is configured to compare the load distribution before and after transmission to obtain a difference value and judge whether the difference value is smaller than a given tolerance; if the difference is less than a given tolerance, a final load is obtained; in case the difference is greater than or equal to a given tolerance, the processing of the bins continues using the pixel subdivision module, the bin assignment module and the over-the-integral transfer module until a final load is obtained.
Therefore, the pixel subdivision load transfer system can transfer the pneumatic surface load to the structural node, and realizes the conservative property before and after transfer and the accurate matching of load distribution.
Preferably, the surface pressure distribution data is obtained by computational fluid dynamics analysis or wind tunnel testing.
Preferably, the pixel subdivision is a pixelized subdivision by geometric centroid.
Preferably, the binning module is configured to assign each sub-bin to a corresponding structural load-bearing point.
Preferably, the pixel subdivision load transfer system of the present invention further comprises a structure bearing point grouping module configured to: the structure bearing points are grouped before the binning pixels are subdivided into sufficiently small subdivision bins.
The pixel subdivision load transfer method and the pixel subdivision load transfer system can be used for converting pneumatic surface pressure into structural load and can be used for analyzing aeroelasticity.
The general interpolation method has certain error in load transmission, even if the interpolation is carried out after plane segmentation, the interpolation relation is limited in a smaller range, the overall error of the interpolation is changed into a smaller local error, and the error is reduced on the whole. But local errors still exist.
The pixel subdivision load transfer method and the pixel subdivision load transfer system can keep the advantages of the interpolation method of conservation and easy realization, and simultaneously solve the problem of poor matching effect of the interpolation method in local load distribution.
Meanwhile, the pixel subdivision load transfer method and the pixel subdivision load transfer system do not limit the region, the region can be a set of any bearing point in a three-dimensional space, and a segmentation plane does not need to be defined, so that manual intervention is reduced, and automation is improved.
The pixel subdivision load transfer method and system of the present invention are specifically described below using the load transfer of an airfoil structure as an example. First, as shown in fig. 3, the wing structure and aerodynamic profile are modeled, and the wing structure and aerodynamic profile are schematically shown in fig. 3. The aerodynamic profile of the wing comprises: slat aerodynamic surface 1, flap aerodynamic surface 2, main wing aerodynamic surface 3. The corresponding structural component comprises: slat structural component 4, flap structural component 5, main wing structural component 6.
As shown in fig. 4, during the initial load transfer, the initial pneumatic surface element groups are assigned in a matching relationship with the structural member bearing points in the vicinity according to the corresponding assignment arrows D. If the difference in load distribution before and after transfer is not satisfactory (i.e., if the difference is greater than or equal to a given tolerance), then the larger bins are pixel subdivided.
As shown in fig. 5, assuming that a certain primitive needs to be split, there are two component groups, a group and B group respectively. Is initially assigned to group a. After the pixel is subdivided, it is equally divided into 4 equal divisions, so that the original bin is split into 4 small bins. And the 4 surface elements are grouped again according to the distance rule. Of the 4 bins, 1 bin was assigned to group A and 3 bins were assigned to group B. And (4) carrying out load transmission again, if the difference of the load distribution before and after transmission still does not meet the requirement, continuously subdividing the elements, and repeating the process until the requirement is met (namely, the difference is smaller than a given tolerance, and the final load is obtained).
Compared with the common interpolation method in the prior art, the pixel subdivision load transfer method and the pixel subdivision load transfer system have the following advantages:
load conservation and distribution consistency before and after transmission are ensured;
the ability to handle the load transfer of structural components of arbitrary geometry and aerodynamic profiles;
the transfer accuracy is improved through pixel subdivision, and accurate matching is achieved.
Some exemplary embodiments have been described above. Nevertheless, it will be understood that various modifications may be made. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices, or circuits are combined in a different manner and/or replaced or supplemented by additional components or their equivalents. Accordingly, other embodiments are within the scope of the following claims.
Claims (4)
1. A pixel subdivision load transfer method, comprising:
acquiring surface pressure distribution data in the form of surface elements and corresponding pressures;
subdividing the bin pixels into sufficiently small subdivided bins, wherein the pixel subdivision is a pixelization aliquot by geometric centroid, the number of aliquots depending on the bin shape type;
distributing the subdivision elements to corresponding structure bearing points, wherein each subdivision element is distributed to a corresponding structure bearing point;
dividing the subdivision elements distributed to the same structure bearing point into concentration force and moment, and transmitting the concentration force and the moment to the structure bearing point;
comparing the load distribution before and after transmission to obtain a difference value, and judging whether the difference value is smaller than a given tolerance;
-obtaining a final load if said difference is less than a given tolerance;
if the difference is larger than or equal to the given tolerance, pixel subdivision is carried out on the face element, and the subsequent steps are repeated until the final load is obtained;
the component groupings are assigned on a distance-by-distance basis to the structure-bearing points before subdividing the bin pixels into sufficiently small subdivision bins.
2. The pixel subdivision load transfer method of claim 1, wherein the surface pressure distribution data is obtained by computational fluid dynamics analysis or wind tunnel testing.
3. A pixel subdivision load transfer system comprising:
a data acquisition module configured to acquire surface pressure distribution data in the form of bins and their corresponding pressures;
a pixel subdivision module configured to subdivide the bin pixels into sufficiently small subdivided bins, wherein the pixel subdivision is a pixelization partition by geometric centroid, the number of partitions depending on the bin shape type;
a binning assignment module configured to assign the subdivision bins to corresponding structure bearing points, wherein each subdivision bin is assigned to a corresponding structure bearing point;
an integral transfer module configured to integrate the subdivision elements assigned to the same structure bearing point into a concentration force and a moment, and to transfer the concentration force and the moment to the structure bearing point;
a comparison and judgment module configured to compare the load distributions before and after transfer to obtain a difference value, and judge whether the difference value is smaller than a given tolerance; -obtaining a final load if said difference is less than a given tolerance; if the difference is greater than or equal to a given tolerance, continuing processing the bins using the pixel subdivision module, bin allocation module, and transfer of integrals module until a final load is obtained;
a structural bearing point grouping module configured to: the component groupings are assigned on a distance-by-distance basis to the structure-bearing points before subdividing the bin pixels into sufficiently small subdivision bins.
4. The pixel subdivision load transfer system of claim 3, wherein said surface pressure distribution data is obtained by computational fluid dynamics analysis or wind tunnel testing.
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| CN112434457B (en) * | 2020-12-04 | 2023-03-14 | 上海波客实业有限公司 | Method for converting pneumatic load into structural load |
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