CN112052509A - Design method of multi-cavity combined air film template suitable for free-form surface thin shell construction - Google Patents
Design method of multi-cavity combined air film template suitable for free-form surface thin shell construction Download PDFInfo
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Abstract
The invention discloses a design method of a multi-cavity combined air film template suitable for free-form surface thin shell construction, relates to a design method of a free-form surface thin shell, and particularly relates to a design method of a multi-cavity combined air film template suitable for free-form surface thin shell construction. The invention aims to solve the problem that the prior art cannot design and manufacture a free-form surface thin shell structure. The method comprises the following steps: the method comprises the following steps: establishing a cavity unit; step two: splitting a thin shell with a complex curved surface; step three: preliminarily combining the cavities; step four: trimming the multiple cavities; step five: primarily optimizing the shape of the cavity unit; step six: and (3) accurately optimizing the multi-cavity combined air film. The invention is used for realizing the design and processing of the multi-cavity combined gas film template with the free-form surface thin-shell structure.
Description
Technical Field
The invention relates to a design method of a free-form surface thin shell, in particular to a design method of a multi-cavity combined air film template suitable for free-form surface thin shell construction.
Background
Compared with the traditional rigid frame construction template, the inflatable membrane template is widely applied to the field of construction and construction of large-span thin-shell structures due to the characteristics of light weight, simplicity, reasonable stress and curved surface modeling. However, most of the currently applied inflatable membrane construction templates are regularly shaped like a column shell and a spherical shell, so that the construction of the thin shell structure with the complex curved surface shape is limited to a certain extent. Therefore, the curved surface thin shell structure needs to be designed and utilized, and the prior art cannot design and manufacture the structure of the free-form surface thin shell. And there is little systematic research on free-form surface thin shell structures.
Disclosure of Invention
The invention aims to solve the problem that the prior art can not design and manufacture a free-form surface thin shell structure, and further needs a design method of a multi-cavity combined air film template suitable for free-form surface thin shell construction.
The technical scheme adopted by the invention for solving the problems is as follows:
the method comprises the following steps: establishing a cavity unit: establishing a basic unit cavity in Rhinoceros parametric modeling software, wherein the basic unit cavity comprises one or more of a spherical cavity, a conical cavity, a cylindrical cavity, a circular truncated cone cavity and a circular tube arch cavity;
step two: splitting a thin shell with a complex curved surface: splitting according to the inner surface shape and curvature change of the free-form surface thin shell structure, and dividing the free-form surface thin shell structure into a plurality of regular areas which accord with the basic cavity unit structure;
step three: the primary combination of the cavity: splitting according to the second step, and selecting a corresponding unit cavity to perform preliminary combination on a Rhino-Grasshopper parameterized software platform;
step four: trimming the multiple cavities: cutting the cavity units preliminarily combined in the third step, and deleting redundant areas;
step five: and (3) initially finding the shape of the cavity unit for optimization: firstly, performing primary air film shape finding analysis on each cavity unit in the fourth step, firstly constraining the boundary of each cavity unit, and then performing primary shape optimization on each cavity unit by adopting a vector type mechanical frame and a genetic algorithm;
step six: the multi-cavity combined air film is precisely optimized: sequentially assembling the optimized cavity units in the step five into a multi-cavity inflatable membrane, wherein the connection part of each cavity unit is fixed by arranging a membrane, an inner stay cable and an outer stay cable; and the integral multi-cavity membrane structure is optimized for the second time, so that the error between the multi-cavity combined membrane structure and the free-form surface thin shell structure is minimized, and the multi-cavity combined air membrane design of the free-form surface thin shell is completed.
The invention has the beneficial effects that:
1. compared with the traditional spherical and cylindrical inflatable membrane construction template, the inflatable membrane construction template can realize the design of the inflatable membrane template with a complex free-form surface structure by reasonably combining five basic cavity units.
2. The invention improves the form error between the gas film construction template and the thin shell design scheme by arranging the structural measures such as the guy cable, the membrane and the like in the gas film template.
3. The free-form surface air film template designed by the invention has the advantages that the stress on the film surface is relatively uniform, the outer surface of the inflatable film is smooth, and the situations of local wrinkles and the like are basically avoided.
4. According to the invention, by arranging the structural measures such as the guy cable and the membrane in the inflatable membrane template, the integral bearing performance of the inflatable membrane template is improved, and the local collapse of the inflatable membrane template in the construction injection process is prevented.
Drawings
FIG. 1 is a schematic perspective view of a spherical cavity;
FIG. 2 is a schematic perspective view of a conical chamber;
FIG. 3 is a schematic perspective view of a cylindrical chamber;
FIG. 4 is a schematic perspective view of a cavity of a circular truncated cone;
FIG. 5 is a schematic perspective view of a circular arch cavity;
FIG. 6 is a schematic perspective view of the thin shell structure of the multi-spherical combination type according to an embodiment;
FIG. 7 is a schematic plan view of the thin shell structure of the multi-spherical combined type according to an embodiment;
FIG. 8 is a schematic perspective view of a combined hemisphere according to an embodiment;
FIG. 9 is a schematic view of a planar structure of the combined hemisphere according to the first embodiment;
FIG. 10 is a schematic diagram of a cross section of a sphere before cutting according to an embodiment;
FIG. 11 is a schematic diagram of a cut structure of an intersecting portion of a sphere according to an embodiment;
FIG. 12 is a schematic view of an embodiment with internal connection membranes along intersecting lines of hemispheres;
FIG. 13 is a schematic diagram illustrating a structure of the diaphragm after a hollow hole is cut in the middle of each diaphragm according to an embodiment;
FIG. 14 is a schematic view of the structure of an inflatable membrane template according to an embodiment; where 1 is a void.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 3, and the method for designing a multi-cavity combined gas film of a free-form surface thin shell according to the present embodiment is performed according to the following steps:
the method comprises the following steps: establishing a cavity unit: establishing a basic unit cavity in Rhinoceros parametric modeling software, wherein the basic unit cavity comprises one or more of a spherical cavity, a conical cavity, a cylindrical cavity, a circular truncated cone cavity and a circular tube arch cavity;
step two: splitting a thin shell with a complex curved surface: splitting according to the inner surface shape and curvature change of the free-form surface thin shell structure, and dividing the free-form surface thin shell structure into a plurality of regular areas which accord with the basic cavity unit structure;
step three: the primary combination of the cavity: splitting according to the second step, and selecting a corresponding unit cavity to perform preliminary combination on a Rhino-Grasshopper parameterized software platform;
step four: trimming the multiple cavities: cutting the cavity units preliminarily combined in the third step, and deleting redundant areas;
step five: and (3) initially finding the shape of the cavity unit for optimization: firstly, performing primary air film shape finding analysis on each cavity unit in the fourth step, firstly constraining the boundary of each cavity unit, and then performing primary shape optimization on each cavity unit by adopting a vector type mechanical frame and a genetic algorithm;
step six: the multi-cavity combined air film is precisely optimized: sequentially assembling the optimized cavity units in the step five into a multi-cavity inflatable membrane, wherein the connection part of each cavity unit is fixed by arranging a membrane, an inner stay cable and an outer stay cable; and the integral multi-cavity membrane structure is optimized for the second time, so that the error between the multi-cavity combined membrane structure and the free-form surface thin shell structure is minimized, and the multi-cavity combined air membrane design of the free-form surface thin shell is completed.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: and fifthly, performing form primary optimization on each cavity unit by adopting a vector finite element algorithm and a genetic algorithm. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: and in the sixth step, the joints of the cavity units are made of PVC films by arranging the films and the films in the cavity. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: and in the sixth step, the inner inhaul cable and the outer inhaul cable are polypropylene ropes. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: and cutting holes with the diameter of 10-50 cm at the joints of the cavity units through the middle parts of the diaphragms. The rest is the same as one of the first to fourth embodiments.
The purpose of this embodiment is to balance the air pressure inside each chamber.
Examples
The first embodiment is as follows: a design method of a multi-cavity combined air film template suitable for free-form surface thin shell construction is carried out according to the following steps:
the method comprises the following steps: establishing a cavity unit: establishing a basic unit cavity in Rhinoceros parametric modeling software, wherein the basic unit cavity comprises one or more of a spherical cavity, a conical cavity, a cylindrical cavity, a circular truncated cone cavity and a circular tube arch cavity;
step two: splitting a thin shell with a complex curved surface: splitting according to the inner surface shape and curvature change of the free-form surface thin shell structure, and dividing the free-form surface thin shell structure into a plurality of regular areas which accord with the basic cavity unit structure;
step three: the primary combination of the cavity: splitting according to the second step, and selecting a corresponding unit cavity to perform preliminary combination on a Rhino-Grasshopper parameterized software platform;
step four: trimming the multiple cavities: cutting the cavity units preliminarily combined in the third step, and deleting redundant areas;
step five: and (3) initially finding the shape of the cavity unit for optimization: firstly, performing primary air film shape finding analysis on each cavity unit in the fourth step, firstly constraining the boundary of each cavity unit, and then performing primary shape optimization on each cavity unit by adopting a vector type mechanical frame and a genetic algorithm;
step six: the multi-cavity combined air film is precisely optimized: sequentially assembling the optimized cavity units in the step five into a multi-cavity inflatable membrane, wherein the connection part of each cavity unit is fixed by arranging a membrane, an inner stay cable and an outer stay cable; and the integral multi-cavity membrane structure is optimized for the second time, so that the error between the multi-cavity combined membrane structure and the free-form surface thin shell structure is minimized, and the multi-cavity combined air membrane design of the free-form surface thin shell is completed.
Compared with the traditional spherical and cylindrical inflatable membrane construction template, the inflatable membrane construction template has the advantages that the design of the inflatable membrane template with a complex free-form surface structure can be realized through the reasonable combination of the five basic cavity units.
The embodiment improves the form error between the gas film construction template and the thin shell design scheme by arranging structural measures such as a guy cable and a membrane in the gas film template.
The free-form surface air film template designed by the embodiment has the advantages that the stress on the surface of the film is uniform, the outer surface of the inflatable film is smooth, and the conditions of local folds and the like are basically avoided.
This embodiment has improved the whole bearing performance of aerifing the membrane template through setting up constructional measures such as cable, diaphragm in aerifing the membrane template inside, prevents that the local collapse from appearing in the construction injection process gas membrane template.
Claims (5)
1. A design method of a multi-cavity combined air film template suitable for free-form surface thin shell construction is characterized by comprising the following steps: the method is realized according to the following steps:
the method comprises the following steps: establishing a cavity unit: establishing a basic unit cavity in Rhinoceros parametric modeling software, wherein the basic unit cavity comprises one or more of a spherical cavity, a conical cavity, a cylindrical cavity, a circular truncated cone cavity and a circular tube arch cavity;
step two: splitting a thin shell with a complex curved surface: splitting according to the inner surface shape and curvature change of the free-form surface thin shell structure, and dividing the free-form surface thin shell structure into a plurality of regular areas which accord with the basic cavity unit structure;
step three: the primary combination of the cavity: splitting according to the second step, and selecting a corresponding unit cavity to perform preliminary combination on a Rhino-Grasshopper parameterized software platform;
step four: trimming the multiple cavities: cutting the cavity units preliminarily combined in the third step, and deleting redundant areas;
step five: and (3) initially finding the shape of the cavity unit for optimization: firstly, performing primary air film shape finding analysis on each cavity unit in the fourth step, firstly constraining the boundary of each cavity unit, and then performing primary shape optimization on each cavity unit by adopting a vector type mechanical frame and a genetic algorithm;
step six: the multi-cavity combined air film is precisely optimized: sequentially assembling the optimized cavity units in the step five into a multi-cavity inflatable membrane, wherein the connection part of each cavity unit is fixed by arranging a membrane, an inner stay cable and an outer stay cable; and the integral multi-cavity membrane structure is optimized for the second time, so that the error between the multi-cavity combined membrane structure and the free-form surface thin shell structure is minimized, and the multi-cavity combined air membrane design of the free-form surface thin shell is completed.
2. The design method of the multi-cavity combined air film template suitable for the free-form surface thin shell construction according to claim 1, wherein the method comprises the following steps: and fifthly, performing form primary optimization on each cavity unit by adopting a vector finite element algorithm and a genetic algorithm.
3. The design method of the multi-cavity combined air film template suitable for the free-form surface thin shell construction according to claim 1, wherein the method comprises the following steps: and in the sixth step, the joints of the cavity units are made of PVC films by arranging the films and the films in the cavity.
4. The design method of the multi-cavity combined air film template suitable for the free-form surface thin shell construction according to claim 1, wherein the method comprises the following steps: and in the sixth step, the inner inhaul cable and the outer inhaul cable are polypropylene ropes.
5. The design method of the multi-cavity combined air film template suitable for the free-form surface thin shell construction according to claim 1, wherein the method comprises the following steps: and cutting holes with the diameter of 10-50 cm at the joints of the cavity units through the middle parts of the diaphragms.
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2020
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| US6547189B1 (en) * | 1999-01-25 | 2003-04-15 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Inflatable vessel and method |
| CN108629117A (en) * | 2018-05-08 | 2018-10-09 | 中国二十二冶集团有限公司 | Large-span steel arching surface grids layer Steel Structure modeling method based on Rhino platforms |
| CN111062072A (en) * | 2019-12-09 | 2020-04-24 | 桂林理工大学 | Cable membrane structure form finding design method based on particle swarm optimization algorithm |
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Effective date of registration: 20230625 Address after: 150090 No. 73, the Yellow River Road, Nangang District, Heilongjiang, Harbin Patentee after: Sun Jianfeng Address before: 152100 Room 201, 2nd floor, Science Park building, Harbin University of technology, No. 434, youyou street, Nangang District, Harbin City, Heilongjiang Province Patentee before: Heilongjiang qiongbing Architectural Design Co.,Ltd. |
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