CN110920098A - Nonmetal wind tunnel test model and interlayer skin forming method thereof - Google Patents
Nonmetal wind tunnel test model and interlayer skin forming method thereof Download PDFInfo
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- CN110920098A CN110920098A CN201911226156.0A CN201911226156A CN110920098A CN 110920098 A CN110920098 A CN 110920098A CN 201911226156 A CN201911226156 A CN 201911226156A CN 110920098 A CN110920098 A CN 110920098A
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- skin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/40—Test specimens ; Models, e.g. model cars ; Probes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention relates to the field of processing of non-metal wind tunnel test models, aims to solve the problems of complex internal structure, high manufacturing difficulty and high cost of the existing test model, and provides a non-metal wind tunnel test model and a sandwich skin forming method thereof. The method for forming the sandwich skin of the nonmetal wind tunnel test model comprises the following steps: preparing a mould for forming the model skin shell; cutting the fiber cloth and the PMI foam board according to the shape and the surface area of the molded surface in the die; paving one layer of fiber cloth on the inner surface of the mold, brushing glue, paving a PMI foam board, brushing glue and paving the other layer of fiber cloth; and (4) vacuumizing and pressurizing the laminated skin together with the mold after the laying, and curing and molding. The invention has the advantages that the support framework is not required to be arranged in the model, the internal structure of the model is simplified, and the arrangement of the functional parts of the test model is convenient; the method can obviously reduce the difficulty, period and cost of model manufacture; the method has strong practicability, and the model skin is manufactured according to the method, so that the method is particularly suitable for designing and processing the wind tunnel test model with ultra-light total mass.
Description
Technical Field
The invention relates to the field of processing of non-metal wind tunnel test models, in particular to a non-metal wind tunnel test model and a sandwich skin forming method thereof.
Background
The dynamic test of the airplane model developed in the wind tunnel is mainly used for acquiring the characteristics of the airplane in the processes of maneuvering flight, stall, tail spin and the like. The experimental model is usually required to be consistent with the mass distribution of a real aircraft, i.e. to be similar in terms of froude numbers. In response, in the test state, strict requirements are imposed on the maximum linear dimension of the model, the total mass, the maximum allowable deformation in the test, and the impact load that can be endured.
In order to meet the requirements, a common test model is designed into a skin-skeleton structural form and is locally reinforced. However, this design method has a complex internal structure of the model, a high manufacturing difficulty and a high cost.
Disclosure of Invention
The invention aims to provide a nonmetal wind tunnel test model and a sandwich skin forming method thereof, and aims to solve the problems of complex internal structure, high manufacturing difficulty and high cost of the test model in the conventional design method.
The embodiment of the invention is realized by the following steps:
a method for forming a non-metal wind tunnel test model sandwich skin comprises the following steps:
preparing a mould for forming the model skin shell;
cutting the fiber cloth and the PMI foam board according to the shape and the surface area of the molded surface in the die;
paving one layer of fiber cloth on the inner surface of the mold, brushing glue, paving a PMI foam board, brushing glue and paving the other layer of fiber cloth;
and (4) vacuumizing and pressurizing the laminated skin together with the mold after the laying, and curing and molding.
The embodiment of the application has at least one of the following beneficial effects:
the skin manufactured by the method does not need to be internally provided with a supporting framework, so that the internal structure of the model is simplified, and the arrangement of a test model functional part is convenient;
the method can obviously reduce the difficulty, period and cost of model manufacture;
the method has strong practicability, and the model skin is manufactured according to the method, so that the method is particularly suitable for designing and processing the wind tunnel test model with ultra-light total mass (such as the maximum linear dimension/the minimum mass in the test state is more than or equal to 0.5 m/kg).
In one embodiment:
the fiber cloth is carbon fiber cloth or glass fiber cloth.
In one embodiment:
after curing and forming, the interlayer skin is pretreated, wherein the pretreatment comprises cutting and/or polishing the interlayer skin to enable the interlayer skin to meet the shape and size requirements of mold assembly.
The application also provides a non-metal wind tunnel test model, which comprises two parts of interlayer skins which are matched with each other to form an integral shell of the test model; the intermediate layer covering includes coincide fibre cloth layer, PMI foam board layer and fibre cloth layer from the bottom up in proper order, and glues each other between the adjacent two-layer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.
Fig. 1 is a schematic view of a sandwich skin of a non-metal wind tunnel test model in this embodiment being molded on a mold;
fig. 2 is a schematic view of a mold.
Icon: 10-a mould; 20-sandwich skin; 21-a fiber cloth layer; 22-glue layer; 23-a PMI foam layer; 24-glue layer; 25-fiber cloth layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the terms are only used for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
With the continuous improvement of flight safety, higher and higher requirements are provided for the referability and precision of some characteristic data of the airplane in tests of maneuvering flight, stall, tail spin and the like, which are acquired in a wind tunnel test. This requires that the test model used for the wind tunnel test has a high degree of conformity with the mass distribution of a real aircraft, for example, the maximum linear dimension of the test model is usually required to be not more than 2 m, the total mass is within 15 kg, the maximum allowable deformation in the test is less than 1 mm, and the test can withstand impact loads of up to 5 times the gravity.
Generally, a skeleton support is designed in a skin of a test model, and local reinforcement is needed under most conditions to meet the requirement of the test model on impact load resistance. The inventor researches and discovers that the design method has difficulties in quality control, appearance size control and the like of the test model, and the existence of the framework causes obstruction to the arrangement of internal functional parts of the test model, so that the difficulty of completely meeting the requirements of the design is very high, and the test model has a complex internal structure, high manufacturing difficulty and high cost.
Based on the above problems, the research and development personnel who have proposed the present application have proposed a new experimental model manufacturing scheme through long-term research and trial.
Referring to fig. 1 in a matching manner, the embodiment provides a method for forming a sandwich skin of a non-metal wind tunnel test model, which includes the following steps:
preparing a mould 10 for molding the model skin shell;
cutting the fiber cloth and the PMI foam board according to the shape and the surface area of the inner molded surface of the mold 10; the PMI foam board has the characteristics of low density, high strength, easiness in cutting and the like;
after one layer of fiber cloth is laid on the inner surface of the mold 10 and glue is brushed, a PMI foam board is laid, and then glue is brushed to lay another layer of fiber cloth;
and (3) vacuumizing and pressurizing the laminated skin together with the mould 10 after the laying, and curing and molding.
Thus, the sandwich skin 20 for the test model is obtained, and the shape of the sandwich skin conforms to the inner profile of the mold 10, and the sandwich skin sequentially comprises a fiber cloth layer 21, a glue layer 22, a PMI foam layer 23, a glue layer 24 and a fiber cloth layer 25. The test model integral shell can be spliced by two or more interlayer skins with mutually matched shapes; and arranging required functional parts on the basis of the integral shell to obtain a non-metal wind tunnel test model meeting the requirements. The test model formed by the method has enough high structural strength and rigidity without arranging a framework inside, and simultaneously has low overall mass, thereby completely meeting the requirements. And, because the structure that adopts no skeleton, the functional unit of experimental model can conveniently be arranged in whole shell.
In sum, the sandwich skin obtained by the method has at least the following beneficial effects:
the skin manufactured by the method does not need to be internally provided with a supporting framework, so that the internal structure of the model is simplified, and the arrangement of a test model functional part is convenient;
the method can obviously reduce the difficulty, period and cost of model manufacture;
the method has strong practicability, and the model skin is manufactured according to the method, so that the method is particularly suitable for designing and processing the wind tunnel test model with ultra-light total mass (such as the maximum linear dimension/the minimum mass in the test state is more than or equal to 0.5 m/kg).
In this embodiment, when necessary, the cured and molded sandwich skin may be subjected to preprocessing such as cutting and/or polishing, and then spliced and matched to form the final model skin.
The fiber cloth in this scheme can adopt carbon fiber cloth or glass fiber cloth. Of course, other suitable fiber cloths are not excluded.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for forming a non-metal wind tunnel test model sandwich skin is characterized by comprising the following steps:
preparing a mould for forming the model skin shell;
cutting the fiber cloth and the PMI foam board according to the shape and the surface area of the molded surface in the die;
paving one layer of fiber cloth on the inner surface of the mold, brushing glue, paving a PMI foam board, brushing glue and paving the other layer of fiber cloth;
and (4) vacuumizing and pressurizing the laminated skin together with the mold after the laying, and curing and molding.
2. The method for molding the sandwich skin of the non-metal wind tunnel test model according to claim 1, wherein the method comprises the following steps:
the fiber cloth is carbon fiber cloth or glass fiber cloth.
3. The method for molding the sandwich skin of the non-metal wind tunnel test model according to claim 1, wherein the method comprises the following steps:
after curing and forming, the interlayer skin is pretreated, wherein the pretreatment comprises cutting and/or polishing the interlayer skin to enable the interlayer skin to meet the shape and size requirements of mold assembly.
4. A nonmetal wind tunnel test model is characterized in that:
the test model comprises two parts of interlayer skins which are matched with each other to form a test model integral shell; the intermediate layer covering includes coincide fibre cloth layer, PMI foam board layer and fibre cloth layer from the bottom up in proper order, and glues each other between the adjacent two-layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226156.0A CN110920098A (en) | 2019-12-03 | 2019-12-03 | Nonmetal wind tunnel test model and interlayer skin forming method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226156.0A CN110920098A (en) | 2019-12-03 | 2019-12-03 | Nonmetal wind tunnel test model and interlayer skin forming method thereof |
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| Publication Number | Publication Date |
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| CN110920098A true CN110920098A (en) | 2020-03-27 |
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| CN201911226156.0A Pending CN110920098A (en) | 2019-12-03 | 2019-12-03 | Nonmetal wind tunnel test model and interlayer skin forming method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106696303A (en) * | 2015-11-17 | 2017-05-24 | 珠海航太科技有限公司 | Process for manufacturing wing cover having composite sandwiched structure |
| CN108248064A (en) * | 2017-12-15 | 2018-07-06 | 惠阳航空螺旋桨有限责任公司 | A kind of manufacturing method of blade tip carbon fiber structural |
| CN209570320U (en) * | 2018-12-07 | 2019-11-01 | 西北工业大学 | A kind of fluorescence silk thread mounting device |
-
2019
- 2019-12-03 CN CN201911226156.0A patent/CN110920098A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106696303A (en) * | 2015-11-17 | 2017-05-24 | 珠海航太科技有限公司 | Process for manufacturing wing cover having composite sandwiched structure |
| CN108248064A (en) * | 2017-12-15 | 2018-07-06 | 惠阳航空螺旋桨有限责任公司 | A kind of manufacturing method of blade tip carbon fiber structural |
| CN209570320U (en) * | 2018-12-07 | 2019-11-01 | 西北工业大学 | A kind of fluorescence silk thread mounting device |
Non-Patent Citations (3)
| Title |
|---|
| 中国大百科全书出版社编辑部 等: "《中国大百科全书：航空航天》", 30 April 1992, 中国大百科全书出版社 * |
| 卢征: "《遥控模型滑翔机基础知识》", 30 April 2016, 北京航空航天大学出版社 * |
| 夏征农: "《辞海 工程技术分册》", 31 December 1987, 上海辞书出版社 * |
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Application publication date: 20200327 |