CN102205585A - Manufacturing method of large-scale thin-casing structured full aero-elastic model for wind tunnel test - Google Patents
Manufacturing method of large-scale thin-casing structured full aero-elastic model for wind tunnel test Download PDFInfo
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- CN102205585A CN102205585A CN201110002205XA CN201110002205A CN102205585A CN 102205585 A CN102205585 A CN 102205585A CN 201110002205X A CN201110002205X A CN 201110002205XA CN 201110002205 A CN201110002205 A CN 201110002205A CN 102205585 A CN102205585 A CN 102205585A
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Abstract
The invention discloses a manufacturing method of a large-scale thin-casing structured full aero-elastic model for a wind tunnel test. The manufacturing method comprises steps that: (1) an internal model is arranged; a plurality of parallel annular thin-casing thickness controlling strips are fixed on an outer surface of the model; spacings are provided between every two neighboring thickness controlling strips; (2) a colloid material is poured between every two neighboring thickness controlling strips, wherein the thickness of the poured colloid material equals to the heights of the neighboring thickness controlling strips; (3) after the poured colloid material is solidified, the thickness controlling strips are removed; the colloid material is then poured into the slots where there were originally thickness controlling strips; after the poured colloid material is solidified, a finished thin-casing structured model is obtained. According to the invention, only an internal mold is needed to be prepared. The manufactured model reflects wind-induced responses accurately, and the precision of the model is easy to control.
Description
Technical field
The present invention relates to shell structure wind tunnel test gas bullet modelling technology fully, be applicable to large-scale shell structure wind tunnel test gas bullet modelling fully.
Background technology
Shell structure belongs to the space-load structure, can will be decomposed into the film power in the housing face perpendicular to the external force of surface of shell, mainly bear axial compressive force in the curved surface and moment of flexure seldom, stressed more reasonable, the strength of materials can be fully used, with lighter dead load, the bigger rigidity of structure and the large span and the large space of advantages of high bearing capacity implementation structure.Sydney Opera House world-famous is exactly typical shell construction, all much stride or volumed space building all belongs to shell structure such as China Beijing Great Hall of the People, station hall, Beijing, power plant large cooling column, its profile generally all has a curved surface that is formed by the straight line rotation of a plane curve in same plane, this curve is called bus, shell can be divided into barrel shell, dome shell, double curved shell and hyperbolic paraboloid shell, hypar shell etc. by the difference of bus, is referred to as shell of revolution.This class formation generally belongs to flexible structure, and for earthquake load and temperature effect, it is more responsive to wind load, is the controlled load of this type of shell structure design.This class formation has very strong aeroelasticity effect, there are some researches show speed that its resonance stress increases with the wind speed growth rate much larger than quasistatic stress, its aerodynamic force or response under wind action need obtain by the wind tunnel test of aeroelastic model.
Aerodynamic force or the response of structure under wind action can be passed through sections model, equivalent model and the acquisition of perfect elasticity model measurement, and the sections model is only investigated the part of structure, is applicable to study to stream the stronger building structure of bidimensionality (as Longspan Bridge); Inner rigidity and the qualitative character that comes model configuration with material of equivalent model with certain mass and rigidity, the model configuration profile is come with more frivolous membrane material in the outside, but this class model quality, Stiffness Distribution are discontinuous, model structure internal force distributes different fully with real structure, and is only effective for the prevailing structure of certain first order mode of research; Gas bullet model is just the same with ratio in kind on geometric scale fully, and can satisfy the similar parameter (quality, rigidity, damping) of reflection prototype structure characteristic, the dimensionless factor of model measurement gained can be applied directly to and the corresponding prototype structure of experimental condition.For shell structure, it streams with the vibration shape and presents very strong three-dimensional feature, in theory, and the most suitable wind-induced vibration situation that is used for studying it of perfect elasticity model.But such modelling is quite difficult, is mainly reflected in: be difficult to find and satisfy the certain density and the suitable material of rigidity requirement; The shell structure average physique is huge but wall thickness is very little, and by how much scaling factors of test commonly used, the thinnest part of model will be less than 1mm, if modelling adopts integral cutting to finish, its thickness, profile are difficult to control; If employing is outer, inner mold is controlled its physical dimension, but because the size of mould is very big, and the difficulty of its machining is still very big, and precision also is difficult to control.Therefore, present prior art mostly adopt equivalent model to assess the gas snap of shell structure should.
Summary of the invention
The technical problem to be solved in the present invention is, study the truly charming appearance and behaviour response of reflect structure of wind-induced vibration of shell structure at present employing equivalent model, and use is outer, inner mold is made problems such as gas bullet model difficulty is big fully, precision is wayward, a kind of large-scale shell structure wind tunnel test gas bullet model production method fully is provided, it is the shell structure wind tunnel test perfect elasticity modelling technology that only needs internal mold, the model that makes is the charming appearance and behaviour response of reflect structure truly, and model accuracy is easy to control.
For achieving the above object, the technical solution adopted in the present invention is that the described large-scale shell structure wind tunnel test step of gas bullet model production method fully is:
(1) the internal mold mould of shell structure is set, at fixing many shell THICKNESS CONTROL bars of annular of being parallel to each other and being of this mold outer surface, the height of shell THICKNESS CONTROL bar for this shell THICKNESS CONTROL bar at the be fixed model thickness of position of mold outer surface; Leave spacing between every adjacent two shell THICKNESS CONTROL bars;
(2) colloidal materials is cast between every adjacent two shell THICKNESS CONTROL bars, colloidal materials cast thickness equals the height of described adjacent THICKNESS CONTROL bar;
(3) behind the colloidal materials coagulation forming between described every adjacent two shell THICKNESS CONTROL bars to be cast, the described THICKNESS CONTROL bar of dismantling; Again at original thickness control strip position cast colloidal materials, colloidal materials cast thickness equals its both sides have been poured into a mould and has finished and the colloidal materials height of coagulation forming, behind the colloidal materials coagulation forming, promptly finishes the moulding of shell structure model;
(4) demoulding, promptly.
Below the present invention made further specify.
Further, as shown in Figure 1, the internal mold mould of described shell structure is set to mold and bed die, after finishing the moulding of the shell structure on this mold and the bed die by abovementioned steps (1) (2) (3), with described mold and bed die securing member bolt, at the binding site cast colloidal materials of mold and bed die, model is whole to be connected thereby finish again; During the model demoulding, unload securing member, mold is up taken out, up take out whole model along bed die then, finish the whole demoulding of model, the modelling of gas bullet is finished fully.
The height of described shell THICKNESS CONTROL bar is for protruding the height of internal mold die surface, just among Fig. 1 the bar body of shell THICKNESS CONTROL bar in the internal mold mould size of (horizontal direction) radially.
Used curable colloid material can satisfy the density requirements of gas bullet modelling fully, and modelling technology only need be made an internal mold mould; Can control the model wall thickness by the thickness of THICKNESS CONTROL bar, precision can reach 0.1mm.
As known from the above, the present invention is a kind of large-scale shell structure wind tunnel test gas bullet model production method fully, and its good effect has:
(1) the curable colloid material of Cai Yonging can satisfy the density requirements of gas bullet modelling fully, thereby directly realized the similar requirement of Mass Distribution, the similar requirement of rigidity solidifies the back elastic modelling quantity by colloidal materials and other condition of similarity is regulated The test wind than realizing, and this material flowability and viscosity are fine, are suitable for the cast and the splicing of model;
(2) only need to make an internal mold mould,, interior two moulds outer with making are simultaneously compared, and not only Mold Making is simple, the also easier assurance of precision;
(3) be two sections with mould and model in the minimum punishment of physical dimension, the seam implementation model is whole to be connected by pouring into a mould again with the mould bolt behind the intact model of step pouring, afterwards at first from the inner section die that takes out of model, the whole demoulding of implementation model at last;
(4) control the model wall thickness by the THICKNESS CONTROL bar, and can by reduce THICKNESS CONTROL bar width and between spacing improve the precision of model thickness along height change;
(5) model of made is the integral body that the colloid cast forms, so damping ratio is lower, can satisfy test requirements document.
Description of drawings
Fig. 1 is two sections internal model structure schematic diagrames of an embodiment of the present invention.
In the drawings:
The 1-mold, the 2-screw rod, the 3-nut,
The 4-bed die, 5-THICKNESS CONTROL bar, 6-base.
The specific embodiment
The embodiment 1 described large-scale shell structure wind tunnel test step of gas bullet model production method fully is:
(1) the internal mold mould of shell structure is set, at fixing many shell THICKNESS CONTROL bars of annular of being parallel to each other and being of this mold outer surface, the height of shell THICKNESS CONTROL bar for this shell THICKNESS CONTROL bar at the be fixed model thickness of position of mold outer surface; Leave spacing between every adjacent two shell THICKNESS CONTROL bars;
(2) colloidal materials is cast between every adjacent two shell THICKNESS CONTROL bars, colloidal materials cast thickness equals the height of described adjacent THICKNESS CONTROL bar;
(3) behind the colloidal materials coagulation forming between described every adjacent two shell THICKNESS CONTROL bars to be cast, the described THICKNESS CONTROL bar of dismantling; Again at original thickness control strip position cast colloidal materials, colloidal materials cast thickness equals its both sides have been poured into a mould and has finished and the colloidal materials height of coagulation forming, behind the colloidal materials coagulation forming, promptly finishes the moulding of shell structure model;
(4) demoulding, promptly.
Further, as shown in Figure 1, the internal mold mould of described shell structure is set to mold and bed die, finish the moulding of the shell structure on this mold and the bed die by abovementioned steps (1) (2) (3) after,
With described mold and bed die securing member bolt, at the binding site cast colloidal materials of mold and bed die, model is whole to be connected thereby finish again; During the model demoulding, unload securing member, mold is up taken out, up take out whole model along bed die then, finish the whole demoulding of model, the modelling of gas bullet is finished fully.
Used colloidal materials does not have special requirement, for example can adopt the approaching epoxy resin of a kind of density and concrete---and must answer health (DEVCON) or similar products and all can; Must answer health (DEVCON) and be the commercially available prod, this commercially available prod can be from network address
Http:// www.itwppfchina.com/product_1.php? parent_id-8.htmlOr
Http:// www.devcon.com/Obtain the purchasing channel; It can satisfy the wind tunnel test density requirements of gas bullet modelling fully, thereby directly realized the similar requirement of Mass Distribution, rigidity is similar regulates The test wind than realization by colloidal materials curing back elastic modelling quantity and other condition of similarity, and this material flowability and viscosity are fine, are applicable to model cast and splicing.
Control for model wall thickness (model wall thickness finger print type radial direction wall thickness dimension) precision: make the required internal mold mould of gas bullet model fully, at the fixing plurality of thin thickness of the shell control strip of die surface hoop, the THICKNESS CONTROL bar is made by the ABS plate, its width is decided (not having special requirement) according to mode shape complexity and model thickness along the required precision of height change, thickness equals its place, fixed position model wall thickness, the precision of THICKNESS CONTROL bar can reach 0.1mm, (this spacing does not have special requirement to leave certain spacing between the two THICKNESS CONTROL bars, in general, the width and the spacing of THICKNESS CONTROL bar are more little, and the precision of model is high more); Colloidal materials is cast between two THICKNESS CONTROL bars, treats the THICKNESS CONTROL bar of dismantling again behind the colloidal materials coagulation forming,, finish until model is integrated poured again at the position of original thickness control strip cast colloidal materials, finally demould, modelling is finished.Because the model of making is the integral body that the colloid cast forms, so damping ratio is lower, can satisfy test requirements document.
Embodiment 2: a kind of shell structure wind tunnel test is gas bullet model production method fully, as shown in Figure 1, with power plant hyperbolic cooling tower is example, the hyperbolic cooling tower is in throat's position diameter and thickness minimum, for making the whole demoulding of shell model, in the throat position internal mold mould is divided into mold 1 and 4 two sections of bed dies,, base 6 is housed below bed die 4 when mould lands to prolong mould for the protection model is without prejudice; At the fixing plurality of thin thickness of the shell control strip 5 of described two section die outer surface hoops, the THICKNESS CONTROL bar is made by the ABS plate, its width (short transverse size) is decided along the required precision of height change according to mode shape complexity and model thickness, thickness (radial direction size) equals its place, fixed position model wall thickness, leave a determining deviation between the THICKNESS CONTROL bar, colloidal materials is cast between two control strips, and cast thickness equals the height of its adjacent THICKNESS CONTROL bar 5; Behind the colloidal materials coagulation forming between control strip to be cast, the THICKNESS CONTROL of dismantling bar 5, at original thickness control strip 5 positions cast colloidal materials, cast thickness equals its both sides and has poured into a mould the control strip spacing height that finishes again; Treat that the whole cast of mold 1 and bed die 4 outer surfaces finish, promptly form upper and lower two sections shell models, with described two section die securing members, i.e. screw rod 2 and nut 3 bolts, pour into a mould the joining place of shell cope pattern and Lower Half again, model is whole to be connected thereby finish; During the model demoulding, unload screw rod 2 and nut 3, mold 1 is up taken out, up take out whole model along bed die 4 then, finish the whole demoulding of model, so far the modelling of gas bullet is finished fully.
When described THICKNESS CONTROL bar 5 width and between spacing more little, model thickness is high more along the precision of height change.
Claims (2)
1. one kind large-scale shell structure wind tunnel test gas bullet model production method fully is characterized in that its step is:
(1) the internal mold mould of shell structure is set, at fixing many shell THICKNESS CONTROL bars of annular of being parallel to each other and being of this mold outer surface, the height of shell THICKNESS CONTROL bar for this shell THICKNESS CONTROL bar at the be fixed model thickness of position of mold outer surface; Leave spacing between every adjacent two shell THICKNESS CONTROL bars;
(2) colloidal materials is cast between every adjacent two shell THICKNESS CONTROL bars, colloidal materials cast thickness equals the height of described adjacent THICKNESS CONTROL bar;
(3) behind the colloidal materials coagulation forming between described every adjacent two shell THICKNESS CONTROL bars to be cast, the described THICKNESS CONTROL bar of dismantling; Again at original thickness control strip position cast colloidal materials, colloidal materials cast thickness equals its both sides have been poured into a mould and has finished and the colloidal materials height of coagulation forming, behind the colloidal materials coagulation forming, promptly finishes the moulding of shell structure model;
(4) demoulding, promptly.
2. according to the described large-scale shell structure wind tunnel test of claim 1 gas bullet model production method fully, it is characterized in that, the internal mold mould of described shell structure is set to mold and bed die, finish the moulding of the shell structure model on this mold and the bed die by described step (1) (2) (3) after, with described mold and bed die securing member bolt, at the binding site cast colloidal materials of mold and bed die, model is whole to be connected thereby finish again; During the model demoulding, unload securing member, mold is up taken out, up take out whole model along bed die then, finish the whole demoulding of model, the modelling of gas bullet is finished fully.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108931353A (en) * | 2018-07-05 | 2018-12-04 | 河南理工大学 | The manufacturing method of continuous shell air spring pole for tall and slender structure wind tunnel test |
| CN109365592A (en) * | 2018-10-25 | 2019-02-22 | 福建泉州洛江振丰模配制造有限公司 | A kind of colloid fluid die pressing molding device and the method using its molding plate |
| CN110390156A (en) * | 2019-07-16 | 2019-10-29 | 浙江大学 | The acquisition methods of transmission line of electricity pulsation wind-excited responese under mountain environment |
| CN112590087A (en) * | 2020-12-21 | 2021-04-02 | 大连理工大学 | Modular submarine cable protection pipe casting mold |
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| CN109365592A (en) * | 2018-10-25 | 2019-02-22 | 福建泉州洛江振丰模配制造有限公司 | A kind of colloid fluid die pressing molding device and the method using its molding plate |
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| CN112590087A (en) * | 2020-12-21 | 2021-04-02 | 大连理工大学 | Modular submarine cable protection pipe casting mold |
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