CN105956328A - Parametric curve modeling method of high degree of freedom - Google Patents
Parametric curve modeling method of high degree of freedom Download PDFInfo
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- CN105956328A CN105956328A CN201610362889.7A CN201610362889A CN105956328A CN 105956328 A CN105956328 A CN 105956328A CN 201610362889 A CN201610362889 A CN 201610362889A CN 105956328 A CN105956328 A CN 105956328A
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Abstract
The invention discloses a parametric curve modeling method of a high degree of freedom. The parametric curve modeling method comprises the following steps: 1) establishing a basic model curve, and setting the control parameter of the basic model curve for controlling the shape and the position of the curve; 2) establishing a function curve to control the change rule of the parameter of the basic model curve; 3) intercepting coordinates on a parameter control curve to generate the model curve of different positions; and 4) through a plurality of basic model curves of different positions and different shapes, forming a Nurbs curve. Through the method, when a complex curve is established, required manual design is little, and the generated curve has better controllability, higher deformation degree of freedom, flexibility in parameter setting and control, and high curve continuity and fairness quality.
Description
Technical field
The present invention relates to curved surface modeling field, particularly relate to the parametric surface modeling method of a kind of high-freedom degree.
Background technology
In current industrial circle, along with the raising that properties of product are required, the complexity of product model is more and more higher, common model moulding cannot meet the performance requirement of product, the most complex-curved it is applied in product design, such as aircraft, automobile, boats and ships, blower fan, water pump etc..But these are complex-curved be widely used while, also bring various technical barrier, as the modeling difficulty of curved surface increase, the difficulty of Deformation control increases.Use at present wider as in the 3 d modeling softwares such as Pro-E, SolidWorks, it is generally all to use to set up curve in dots, the method being obtained curved surface by curve combination again, and these 3 d modeling softwares need a large amount of point, line data when setting up complex-curved, during Control curve change, Control curve shape can only be realized by the shape of the diverse location curve of amendment composition curved surface, not only cause curved surface poor controllability, deformation degree of freedom is low, it is impossible to the shape of optional position on Control curve accurately；And parameter setting method is few, it is impossible to giving the Changing Pattern from a position to another position on curved surface, the parameter of each position can only independently change, it is impossible to when ensureing Parameters variation, curved surface steadily smoothly transits.Therefore, traditional measurements of the chest, waist and hips modeling software needs manually to set up the molded line in multiple cross section, and cannot simply control the parameters relationship between each bar molded line, also cannot adjust simply and easily after generating curved surface, set up some complex-curved time, manual designs increase, cause the increase of labour cost.
Summary of the invention
It is an object of the invention to provide the parametric surface modeling method of a kind of high-freedom degree, can obtain just arbitrarily adjusting the curved surface of curve form by adjusting controlling parameter curve, the parametrization Changing Pattern that can guarantee that whole curve form and set is consistent, the curved surface that this method generates, the seriality of curved surface, fairness quality are higher.
For reaching above-mentioned technical purpose, the technical solution adopted in the present invention is: the parametric surface modeling method of a kind of high-freedom degree, it is characterised in that comprise the following steps: 1) set up basic model curve, the control parameter of basic model curve is set, for controlling curve shape, position；2) set up function curve and control the Changing Pattern of basic model parameter of curve；3) from controlling parameter curve, intercept the model curve of Coordinate generation diverse location, parameter curve controls the true form of different fundamental curves, and the position of curve can also be as a parameter, controlled by function curve, numerical value corresponding under some abscissas is intercepted, it becomes possible to be created that the difform fundamental curve of a plurality of diverse location in function curve；4) a Nurbs curved surface is become by a plurality of diverse location difform basic model curve combination.Owing to basic model curve shape is function curvilinear correlation connection, it is only necessary to change the numerical value of function curve, it is possible to change the shape of final curved surface.Therefore, when generating curved surface by this technology, as long as certain curve form disclosure satisfy that only exists a vertical coordinate for an abscissa, it becomes possible to as the curve of control Parameters variation, therefore the flexibility ratio of controlling parameter curve is the highest.The pattern flexibility ratio of fundamental curve is the highest simultaneously, it can be the combination of multiple curve, as long as rationally selecting fundamental curve structure, control parameter is rationally set and selects suitable controlling parameter curve, just can generate the curved surface of arbitrary shape, afterwards by adjusting controlling parameter curve, the curved surface of relevant position will change automatically, such that it is able to adjust the shape of curved surface optional position accurately；And owing to Parameters variation is continuous print, it becomes possible to ensure seriality and the fairness of curved surface.
Model curve in described step 1 is the curve of any one pattern, or the curve that multistage difference pattern curve combination gets up.
The function curve set up in described step 2 is quadratic function, cubic function, exponential function or trigonometric function and the curve that disclosure satisfy that function requirements.
The parametric surface modeling method of a kind of high-freedom degree provided in technical solution of the present invention includes setting up basic model curve, the control parameter of definition basic model curve, set up function curve and control the Changing Pattern of basic model parameter of curve, the model curve of Coordinate generation diverse location is intercepted from controlling parameter curve, a Nurbs curved surface is become by a plurality of diverse location difform basic model curve combination, have the advantages that in this technology that mainly improving curve generates the process of curved surface, the method improving the curve composition curved surface setting up a plurality of diverse location respectively, but initially set up a fundamental curve, and some parameters of this curve negotiating are controlled；Controlled the Changing Pattern of parameters afterwards by some function curves, thus generate a parameterized curved surface.By this method, the profile shape parameter of each position on the curved surface ultimately generated, respective value can be got on the function curve controlling Parameter Variation, as long as then we set the Changing Pattern of each parameter, just can control the curve form of optional position, owing to fundamental curve can be the curve of any pattern, it can also be the curve of multistage difference patterned sets generation, the function curve controlling Parameter Variation can also be any given function, including quadratic function, cubic function, exponential function, trigonometric function and disclosure satisfy that any type curve etc. of function requirements；We can change the coefficient of function, number of times and exponential factor etc., so that blade change has great degree of freedom, and the seriality of function itself can ensure that the seriality of Parameters variation, thus ensure the seriality of whole curved surface, even when setting up more complicated curved surface, by this method, required manual designs is less, have only to create a basic model template curve, given fundamental curve Parameter Variation, not only ensure that whole curve form is consistent with the parametrization Changing Pattern of setting, and by adjusting controlling parameter curve, such as curve coefficients, function number of times, the multiple flexi modes such as control point coordinate adjust curve form, and the curved surface generated by this technology, controllability is more preferable, deformation degree of freedom is higher, parameter arranges and controls more flexible, the seriality of curved surface, fairness quality is higher.
Detailed description of the invention
Hereinafter describe and be used for disclosing the present invention so that those skilled in the art are capable of the present invention.Preferred embodiment in below describing is only used as citing, it may occur to persons skilled in the art that other obvious modification.
As a example by leaf model, model with the parametric surface of high-freedom degree, comprise the following steps: 1) set up basic model curve, the control parameter of basic model curve is set, for controlling curve shape, position, described controlling curve shape, position are determined totally by chord length, maximum gauge, maximum camber, maximum camber position, torsional angle, radial location, axial offset, circumferential offset amount 8 parameters；2) set up function curve and control the Changing Pattern of basic model parameter of curve: set up 8 function curves by 8 parameters of controlling curve shape in step 1 and position, for controlling the Changing Pattern of these 8 parameters, in coordinate diagram, X-coordinate may be considered the order generating blade profile curve, intercept the most from front to back, an arbitrary X-coordinate can find corresponding 8 Y coordinate on these 8 curves, and these 8 Y coordinate just represent the concrete numerical value of corresponding 8 parameters；3) from controlling parameter curve, the model curve of Coordinate generation diverse location is intercepted: intercept the vertical coordinate of controlling parameter curve under different X-coordinate, according to the corresponding blade profile curve of these numerical generations, by instruments such as the scripts of 3 d modeling software, this process can perform on backstage, without these curves of manual creation, the number of curve can also arbitrarily adjust；4) a Nurbs curved surface is become by a plurality of diverse location difform basic model curve combination: these curve combinations are generated curved surface, just can adjust the shape of spoon of blade afterwards by adjusting controlling parameter curve.
By this method, the blade ultimately generated, its chord length, maximum gauge, maximum camber, maximum camber position, torsional angle, radial location, axial offset, circumferential offset amount parameter, respective value can be got on the function curve controlling Parameter Variation, as long as then we set the Changing Pattern of each parameter, just can control the blade shape of optional position, owing to fundamental curve can be the curve of any pattern, it can also be the curve of multistage difference patterned sets generation, the function curve controlling Parameter Variation can also be any given function, including quadratic function, cubic function, exponential function, trigonometric function and disclosure satisfy that any type curve etc. of function requirements；We can change the coefficient of function, number of times and exponential factor etc., so that blade change has great degree of freedom, and the seriality of function itself can ensure that the seriality of Parameters variation, thus ensure the seriality of whole blade, even when setting up the curved surface more more complicated than blade, by this method, required manual designs is less, have only to create a basic model template curve, given fundamental curve Parameter Variation, not only ensure that whole curve form is consistent with the parametrization Changing Pattern of setting, and by adjusting controlling parameter curve, such as curve coefficients, function number of times, the multiple flexi modes such as control point coordinate adjust curve form, and the curved surface generated by this technology, controllability is more preferable, deformation degree of freedom is higher, parameter arranges and controls more flexible, the seriality of curved surface, fairness quality is higher.
The above; it is only the detailed description of the invention of the present invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement; all should contain within protection scope of the present invention, therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (3)
1. the parametric surface modeling method of a high-freedom degree, it is characterized in that, comprise the following steps: 1) set up basic model curve, the control parameter of basic model curve is set, for controlling curve shape, position, 2) set up function curve control basic model parameter of curve Changing Pattern, 3) from controlling parameter curve intercept Coordinate generation diverse location model curve, 4) become a Nurbs curved surface by a plurality of diverse location difform basic model curve combination.
The parametric surface modeling method of a kind of high-freedom degree the most as claimed in claim 1, it is characterised in that the model curve in described step 1 is the curve of any one pattern, or the curve that multistage difference pattern curve combination gets up.
The parametric surface modeling method of a kind of high-freedom degree the most as claimed in claim 1, it is characterised in that the function curve set up in described step 2 is quadratic function, cubic function, exponential function or trigonometric function and the curve that disclosure satisfy that function requirements.
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| CN201610362889.7A CN105956328B (en) | 2016-05-30 | 2016-05-30 | Method for establishing blade model by using high-freedom-degree parametric surface |
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| CN201610362889.7A CN105956328B (en) | 2016-05-30 | 2016-05-30 | Method for establishing blade model by using high-freedom-degree parametric surface |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107330209A (en) * | 2017-07-06 | 2017-11-07 | 常州赞云软件科技有限公司 | A kind of moulding wall intelligent template implementation method based on Parametric designing |
| CN111950103A (en) * | 2020-07-15 | 2020-11-17 | 惠达卫浴股份有限公司 | Parameterized modeling method for toilet bowl sewage discharge pipeline |
| CN112033338A (en) * | 2020-09-14 | 2020-12-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Blade curved surface contact type scanning measurement probe radius surface compensation method |
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| CN101290636A (en) * | 2007-04-18 | 2008-10-22 | 上海磁浮交通工程技术研究中心 | High-speed train head optimized design method |
| CN101739718A (en) * | 2009-12-30 | 2010-06-16 | 北京农业信息技术研究中心 | Parameter template-based corn leaf virtual simulation modeling method |
| US20100156935A1 (en) * | 2008-12-22 | 2010-06-24 | Electronics And Telecommunications Research Institute | Method and apparatus for deforming shape of three dimensional human body model |
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2016
- 2016-05-30 CN CN201610362889.7A patent/CN105956328B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290636A (en) * | 2007-04-18 | 2008-10-22 | 上海磁浮交通工程技术研究中心 | High-speed train head optimized design method |
| US20100156935A1 (en) * | 2008-12-22 | 2010-06-24 | Electronics And Telecommunications Research Institute | Method and apparatus for deforming shape of three dimensional human body model |
| CN101739718A (en) * | 2009-12-30 | 2010-06-16 | 北京农业信息技术研究中心 | Parameter template-based corn leaf virtual simulation modeling method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107330209A (en) * | 2017-07-06 | 2017-11-07 | 常州赞云软件科技有限公司 | A kind of moulding wall intelligent template implementation method based on Parametric designing |
| CN107330209B (en) * | 2017-07-06 | 2020-08-21 | 常州赞云软件科技有限公司 | Modeling wall intelligent template implementation method based on parametric design |
| CN111950103A (en) * | 2020-07-15 | 2020-11-17 | 惠达卫浴股份有限公司 | Parameterized modeling method for toilet bowl sewage discharge pipeline |
| CN112033338A (en) * | 2020-09-14 | 2020-12-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Blade curved surface contact type scanning measurement probe radius surface compensation method |
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Effective date of registration: 20211206 Address after: 211106 floor 11, building B1, No. 19, Suyuan Avenue, Jiangning District, Nanjing City, Jiangsu Province Patentee after: NANJING TIANFU SOFTWARE Co.,Ltd. Address before: 315000 building 006 (19-1), No. 375, Jiangdong North Road, Ningbo, Zhejiang Patentee before: NINGBO HIPOINT INDUSTRIAL DESIGN CO.,LTD. |