CN104772913A - Design method for multi-steady-state deformable switch structure - Google Patents
Design method for multi-steady-state deformable switch structure Download PDFInfo
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- CN104772913A CN104772913A CN201510192049.6A CN201510192049A CN104772913A CN 104772913 A CN104772913 A CN 104772913A CN 201510192049 A CN201510192049 A CN 201510192049A CN 104772913 A CN104772913 A CN 104772913A
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- multistable
- laminate
- designing
- laminated plate
- deformable construction
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
-
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
Abstract
The invention discloses a design method for a multi-steady-state deformable switch structure. The method comprises the following steps: (1) determining the plane shape of a composite material laminated plate according to an actual application environment; (2) determining the change of values of rectangular section area second moment of the laminated plate along the length direction according to the requirements of designed steady state values and the total length of the laminated plate; (3) inversely calculating the data of thicknesses of all the places of the laminated plate according to the values of the rectangular section area second moment and the determined width data; (4) equivalently discretizing the thickness data obtained from the step (3) considering the situation that the thickness of the single-layer fiber woven prepreg is set and cannot continuously change; (5) cutting the prepreg according to the obtained dimension data of the laminated plate, paving up according to the preset thickness and carrying out curing forming according to autoclave technology; and (6) performing displacement constraint on the stiffness-variable laminated plate with the aid of an auxiliary structure to finish the fabrication of the entire switch structure. The multi-steady-state deformable switch structure adopting the design method is light in weight, can achieve large deformation, and has enough stiffness to resist outside loads under steady state without additional support.
Description
Technical field
The invention belongs to technical field of aerospace, relate to a kind of method for designing that can be used for the multistable deformable construction of switch that fluid flowing controls.
Background technology
In recent years, along with the development of aeronautical technology, deformable structure is just receiving increasing concern due to its superior performance.Deformable structure can adapt to different external condition by changing its shape, modal as deformable wing.The rise of deformable structure itself proposes harsher requirement to structure: (1) Structure of need can produce large deformation under certain condition; (2) do not need at steady state to provide support can resist extraneous load yet; (3) structure total quality wants light.
The deformable structure of current routine usually utilizes drive system more complicated in self structure system to move to the rigid body realizing parts as hydraulic means, hinge, telescopic mounting or rotates to realize to be out of shape (as the wing flap of aircraft, aileron and tail vane); The more deformable structure of recent research departs from equilbrium position to deform as utilized piezoelectric and shape memory alloy material to carry out drives structure.These driving methods need the energy input continued to maintain the distortion of structure usually, therefore need in distortion system, implant certain loading equipemtn, control appliance, load maintenance equipment, this will inevitably increase the weight of structure greatly, totally unfavorable for the utilization of deformable structure in Aero-Space.
Summary of the invention
Based on above weak point, the invention provides a kind of method for designing of multistable deformable construction of switch, the multistable deformable construction of switch quality of the method design is slim and graceful, can large deformation be realized and not need to provide extra support also to have enough rigidity in stable state resisting extraneous load, be applicable to technical field of aerospace, especially need the situation controlling air current flow.
Object of the present invention is achieved through the following technical solutions:
A method for designing for multistable deformable construction of switch, material and the instrument of main needs comprise fibre-woven composite prepreg and autoclave, and concrete implementation step is as follows:
(1) according to the size of actual application environment determination laminate along length and width, the flat shape of laminate is namely first determined.
(2) bending stiffness (EI) cutting-pattern design: according to the numerical value change of the requirement determination laminate square-section second moment along its length of design stable state number and laminate total length, guarantee that it has the minimum point of more than 4 (stable state number=minimum counts-1) at least.
(3) numerical value and the fixed width data of the square-section second moment obtained according to step (2) are back-calculated to obtain the thickness data of laminate along its length by square-section second moment computing formula.
(4) consider the thickness of single layer fibre braiding prepreg, carry out equivalent dispersion to the thickness data that the 3rd step obtains, so far, the size design of Varying-thickness composite laminated plate terminates.
(5) according to the laminate sized data that obtains, cutting prepreg, and carry out laying by predetermined thickness, adopts autoclave technique curing molding, and obtain the laminate of variation rigidity under flat state, it has the characteristic of variation rigidity along its length.
(6) design of supplementary structure is completed: by applying displacement constraint at laminate two ends to its Shi Hanzhang, complete the making of whole multistable deformable construction of switch, the adjustable multistable construction of switch obtained has the multiple stable states opened and closed and between this two states.Require that the function that supplementary structure can realize is: be laminate Shi Hanzhang, necessary constraint is provided.
In the present invention, the core concept of described variation rigidity composite laminated plate design is by the dual terrace surface product moment in the THICKNESS CONTROL cross section of controlling sections and then the bending stiffness (EI) controlling laminate along its length, obtains variation rigidity composite laminated plate.
In the present invention, by applying displacement constraint to laminate Shi Hanzhang, making the laminate after constraint have multiple potential energy minimum point, thus showing multistable characteristic.
In the present invention, the composite used is fibre-woven composite, makes each layer in its cross section have identical E value.
In the present invention, its range of application is the situation needing to control fluid flowing, controls not only to be confined to allow, by with no thoroughfare, can also control the degree allowing to pass through to the flowing of fluid.
Operation principle of the present invention: need system to provide a driving force in the course of the work, when its numerical value exceedes the critical load of laminate state transfer, laminate from a kind of stable state saltus step to another kind of stable state, can realize the adjustment of the opening degree of multistable construction of switch.
Tool of the present invention has the following advantages: the multistable deformable construction of switch designed by the inventive method has multiple stable state configuration, necessarily drive can from the saltus step of a kind of stable state configuration to another stable state configuration under dynamic load effect; Be in this structure under stable state configuration not need to provide support and also can resist extraneous load; Structure itself has the high characteristic of composite specific stiffness specific strength simultaneously, and quality is slim and graceful.By providing some supplementary structures this structure general performance can be made to go out the characteristic of switch element as constraint, can realize such as to some basic functions such as the controls inside and outside air-flow turnover aircraft cabin.
Accompanying drawing explanation
Fig. 1 is three-stable state deformable construction of switch-opening;
Fig. 2 is three-stable state deformable construction of switch-intermediateness (part is opened);
Fig. 3 is three-stable state deformable construction of switch-closed condition;
Fig. 4 is three-stable state deformable construction of switch-profile along its length;
Fig. 5 is fibre-woven composite laminate flat shape;
Fig. 6 is the change curve of the second-order section square of square-section along its length;
Fig. 7 is the change (consecutive variations and equivalent dispersion thereof) of laminate thickness along its length;
Fig. 8 be under Bit andits control condition driving force with displacement change curve (open-> part open-> close).
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited thereto; everyly technical solution of the present invention modified or equivalent to replace, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
The invention provides a kind of method for designing of multistable deformable construction of switch, all processes of whole design is as follows:
First, according to the concrete application conditions of certain three-stable state deformable construction of switch its flat shape clear and definite (width Ly (x) change along its length), Fig. 5 is seen.
Determine the dual terrace surface product moment Ixx(x in cross section along its length accordingly) with the variation relation of length, make it meet in the domain of definition (in total length) and there are three minimum points, see Fig. 6.
By square-section Ixx(x) expression formula, known Ixx(x) and width Ly (x) value everywhere, composite laminated plate thickness H(x everywhere can be back-calculated to obtain):
。
Consider the thickness of single layer fibre woven composite prepreg, by its thickness consecutive variations equivalent dispersion along its length, Fig. 7 need be seen.
According to above-mentioned design, utilize fibre-woven composite prepreg to carry out laying by predetermined thickness, adopt autoclave technique curing molding, can obtain the laminate of variation rigidity under flat state, laminate does not now have bistable characteristic.In actual use, need to retrain its two end movement (stiff end constraint) by the situation shown in Fig. 4 that is similar to, and provide the z of two blocks of dull and stereotyped restraint layer plywood one on the other shown in Fig. 1-3 to displacement.This process is equivalent to be applied with a prestressing force to laminate, and under prestressing force effect, variation rigidity laminate will show multistable characteristic, see Fig. 8, and under the cooperation of supplementary structure, this three-stable state deformable construction of switch can realize the control of fluid flow.
Claims (8)
1. a method for designing for multistable deformable construction of switch, is characterized in that described method step is as follows:
(1) according to the size of actual application environment determination composite laminated plate along length and width, the flat shape of laminate is namely first determined;
(2) bending stiffness cutting-pattern design: according to the numerical value change of the requirement determination laminate square-section area second moment along its length of design stable state number and laminate total length;
(3) laminate thickness data is everywhere back-calculated to obtain according to the numerical value of the square-section area second moment obtained in step (2) and fixed width data by the computing formula of square-section second moment;
(4) consider that the thickness of single layer fibre braiding prepreg can not consecutive variations, equivalent dispersion is carried out to the thickness data that the 3rd step obtains;
(5) according to the laminate sized data that obtains, cutting prepreg, and carry out laying by predetermined thickness, adopts autoclave technique curing molding, obtains the laminate of variation rigidity under flat state;
(6) by supplementary structure, displacement constraint is applied to variation rigidity laminate, complete the making of whole multistable deformable construction of switch.
2. the method for designing of multistable deformable construction of switch according to claim 1, is characterized in that described stable state number=minimum counts-1.
3. the method for designing of multistable deformable construction of switch according to claim 1, is characterized in that described minimum is counted and had more than 4 at least.
4. the method for designing of multistable deformable construction of switch according to claim 1, it is characterized in that in described step 3, by laminate square-section second moment Ixx(x everywhere) numerical value and width Ly(x everywhere) value, obtain composite laminated plate thickness H(x everywhere according to following formulae discovery):
。
5. the method for designing of multistable deformable construction of switch according to claim 1, is characterized in that described composite is fibre-woven composite.
6. the method for designing of multistable deformable construction of switch according to claim 1, is characterized in that the range of application of described multistable deformable construction of switch is the situation needing to control fluid flowing.
7. the method for designing of multistable deformable construction of switch according to claim 6, it is characterized in that the described flowing to fluid control for allow by, no thoroughfare or control the degree that allows to pass through.
8. the method for designing of multistable deformable construction of switch according to claim 1, is characterized in that the function that described supplementary structure can realize is: be laminate Shi Hanzhang, provides necessary constraint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510192049.6A CN104772913B (en) | 2015-04-22 | 2015-04-22 | Design method for multi-steady-state deformable switch structure |
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| CN201510192049.6A CN104772913B (en) | 2015-04-22 | 2015-04-22 | Design method for multi-steady-state deformable switch structure |
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| CN104772913A true CN104772913A (en) | 2015-07-15 |
| CN104772913B CN104772913B (en) | 2017-02-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106481964A (en) * | 2015-08-27 | 2017-03-08 | 香港城市大学 | Multistable configuration and preparation method thereof |
| CN107181057A (en) * | 2017-05-18 | 2017-09-19 | 哈尔滨工业大学 | Multi-angle main beam pointing direction figure reconfigurable antenna in a kind of pitching face |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987007576A1 (en) * | 1986-06-02 | 1987-12-17 | Grumman Aerospace Corporation | Transonic wing design procedure |
| US20050194724A1 (en) * | 2003-10-14 | 2005-09-08 | Max Krogager | Method of forming a composite structure |
| CN101505887A (en) * | 2006-06-23 | 2009-08-12 | 剑桥有限公司 | Multistable structural member and method for forming a multistable structural member |
| CN104044729A (en) * | 2014-05-27 | 2014-09-17 | 北京航空航天大学 | Super-altitude propeller device |
-
2015
- 2015-04-22 CN CN201510192049.6A patent/CN104772913B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987007576A1 (en) * | 1986-06-02 | 1987-12-17 | Grumman Aerospace Corporation | Transonic wing design procedure |
| US20050194724A1 (en) * | 2003-10-14 | 2005-09-08 | Max Krogager | Method of forming a composite structure |
| CN101505887A (en) * | 2006-06-23 | 2009-08-12 | 剑桥有限公司 | Multistable structural member and method for forming a multistable structural member |
| CN104044729A (en) * | 2014-05-27 | 2014-09-17 | 北京航空航天大学 | Super-altitude propeller device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106481964A (en) * | 2015-08-27 | 2017-03-08 | 香港城市大学 | Multistable configuration and preparation method thereof |
| CN107181057A (en) * | 2017-05-18 | 2017-09-19 | 哈尔滨工业大学 | Multi-angle main beam pointing direction figure reconfigurable antenna in a kind of pitching face |
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| Publication number | Publication date |
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| CN104772913B (en) | 2017-02-01 |
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