CN111339607A

CN111339607A - D-shaped girder blade modeling method and system

Info

Publication number: CN111339607A
Application number: CN202010128160.XA
Authority: CN
Inventors: 王国华; 王帅
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-06-26
Anticipated expiration: 2040-02-28
Also published as: CN111339607B

Abstract

The invention discloses a D-shaped girder paddle modeling method and system. The method comprises the following steps: determining the shape of a D-shaped girder paddle to be designed and geometric characteristic parameters of components; importing the geometric characteristic parameters of the shape and the assembly into a VB windows application platform, calling an API (application program interface) function of a CATIA COM assembly by the VB windows application platform, and constructing a three-dimensional geometric model of the shape and the assembly of the D-shaped girder blade to be designed by adopting an ActiveX automation technology; and constructing a digital prototype of the three-dimensional model of the blade by using the three-dimensional geometric model of the appearance and the three-dimensional geometric model of the component. The invention can realize the automatic construction of the three-dimensional model and achieve the aim of rapid modeling.

Description

D-shaped girder blade modeling method and system

Technical Field

The invention relates to the field of automatic design, in particular to a D-shaped girder paddle modeling method and system.

Background

In the aspect of automatic geometric modeling of the blade, most domestic research is mainly focused on the C-shaped girder blade, and the blade aiming at the D-shaped beam structure is less researched. For the blade with the C-shaped beam structure, the blade is mainly used for a rotor system of a light helicopter, and the blade with the D-shaped beam structure is mainly used for the rotor system of a medium and heavy helicopter, so the research on the automatic geometric modeling method of the D-shaped girder blade is significant for constructing the digital models of the rotors of the medium and heavy helicopters.

The existing D-shaped girder paddle is subjected to three-dimensional modeling by utilizing three-dimensional modeling software manual operation, needs to be repeatedly modified in the design process, and has the disadvantages of complex process and low efficiency.

Disclosure of Invention

Based on the above, it is necessary to provide a D-shaped girder blade modeling method and system to realize automatic construction of a three-dimensional model, achieve the purpose of rapid modeling, reduce the labor burden, and shorten the development period.

In order to achieve the purpose, the invention provides the following scheme:

a D-shaped girder blade modeling method comprises the following steps:

determining the shape of a D-shaped girder paddle to be designed and geometric characteristic parameters of components; the geometric characteristic parameters of the shape and the assembly comprise geometric characteristic parameters of the shape, skin, counterweight, girder, leading edge fittings and trailing edge fittings;

importing the geometric characteristic parameters of the shape and the assembly into a VB windows application platform, calling an API (application program interface) function of a CATIA COM assembly by the VB windows application platform, and constructing a three-dimensional geometric model of the shape and the three-dimensional geometric model of the assembly of the D-shaped girder blade to be designed according to the geometric characteristic parameters of the shape and the assembly by adopting an ActiveX automation technology; the component three-dimensional geometric model comprises a skin three-dimensional geometric model, a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model;

and constructing a digital prototype of the three-dimensional model of the blade by using the three-dimensional geometric model of the appearance and the three-dimensional geometric model of the assembly.

Optionally, the geometric characteristic parameters of the skin include a distance from an upper edge point of a quadrangular layer of the spanwise upper skin to an end face of the propeller root section, a distance from a lower edge point of the quadrangular layer of the spanwise upper skin to the end face of the propeller root section, a distance from an upper edge point of a layer of the chordwise upper skin to the end face of the propeller root section, a distance from a lower edge point of a layer of the chordwise upper skin to the end face of the propeller root section, and a thickness of the skin;

when the counterweight is circular, the geometric characteristic parameters of the counterweight comprise the distance from the starting end of the spanwise counterweight to the end face of the paddle root section, the distance from the tail end of the spanwise counterweight to the end face of the paddle root section, the radius of the counterweight on the chordwise section and the coordinate of the center of the counterweight on the chordwise section; when the counterweight is in a strip shape, the geometric characteristic parameters of the counterweight comprise the distance from the starting end of the spanwise counterweight to the end face of the paddle root section, the distance from the tail end of the spanwise counterweight to the end face of the paddle root section, the distance from the upper edge point of the counterweight on the chordwise section to the Z axis and the distance from the lower edge point of the counterweight on the chordwise section to the Z axis;

the geometrical characteristic parameters of the girder comprise the distance from the starting end of the girder to the end face of the paddle root section in the spanwise direction, the distance from the tail end of the girder to the end face of the paddle root section in the spanwise direction, the distance from the inner contour of the girder to the front edge in the chordwise section, the distance from the far end of the outer contour of the girder to the front edge in the chordwise section and the inward offset of the airfoil contour;

the leading edge fitting geometric characteristic parameters comprise the distance from the starting end of the leading edge fitting to the end face of the paddle root section in the spanwise direction, the distance from the tail end of the leading edge fitting to the end face of the paddle root section in the spanwise direction, the distance from the upper edge point of the leading edge fitting to the Z axis in the chordwise section and the distance from the lower edge point of the leading edge fitting to the Z axis in the chordwise section;

the geometrical characteristic parameters of the trailing edge fitting comprise the distance from the starting end of the spanwise upper trailing edge fitting to the end face of the paddle root section, the distance from the tail end of the spanwise upper trailing edge fitting to the end face of the paddle root section, the distance from the upper edge point of the trailing edge fitting to the Z axis on the chordwise section and the distance from the lower edge point of the trailing edge fitting to the Z axis on the chordwise section.

Optionally, the importing the geometric characteristic parameters of the shape and the component into a VB windows application platform, the VBwindows application platform calling an API interface function of a CATIA COM component, and constructing a three-dimensional geometric model of the shape of the D-shaped girder blade to be designed and a three-dimensional geometric model of the component according to the geometric characteristic parameters of the shape and the component by using an ActiveX automation technology specifically includes:

the VB windows application platform calls an API (application program interface) function of a CATIACOM component, and an ActiveX (active X) automation technology is adopted to construct a shape three-dimensional geometric model according to the shape geometric characteristic parameters;

the VB windows application platform calls an API (application program interface) function of a CATIACOM component, and an ActiveX (active X) automation technology is adopted to construct a skin three-dimensional geometric model according to the skin geometric characteristic parameters;

and the VB windows application platform calls an API (application program interface) function of the CATIACOM component, and a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model are constructed according to the counterweight geometric characteristic parameters, the girder geometric characteristic parameters, the leading edge fitting geometric characteristic parameters and the trailing edge fitting geometric characteristic parameters by adopting an ActiveX automation technology.

Optionally, the VB windows application platform calls an API interface function of the CATIACOM component, and constructs a three-dimensional geometric model of the shape according to the geometric characteristic parameters by using an ActiveX automation technology, including:

determining an airfoil type of each section of the profile and an airfoil data point set corresponding to the airfoil type from an airfoil database;

the VB windows application platform calls an API (application program interface) function of a CATIACOM component, and creates various profile sketch maps according to the profile geometric characteristic parameters;

leading the airfoil data point set into a corresponding outline profile sketch according to the airfoil type;

connecting points on the upper airfoil surface and the lower airfoil surface in the outline profile sketch, and sealing the rear edge to obtain each sealed outline profile sketch;

connecting the front edge points of the wing profiles in the closed outline profile sketch, and connecting the upper edge end points and the lower edge end points of the rear edge of the wing profiles to obtain the outline profile sketch after connection;

and the VB windows application platform calls function commands of the section curved surfaces to connect the connected outline profile sketches into curved surfaces to obtain an outline three-dimensional geometric model.

Optionally, the VB windows application platform calls an API interface function of a CATIACOM component, and constructs a skin three-dimensional geometric model according to the skin geometric characteristic parameters by using an ActiveX automation technology, including:

the VB windows application platform calls an API function of a CATIACOM component, and judges whether the construction of the appearance three-dimensional geometric model is completed or not to obtain a first judgment result;

if the first judgment result is that the appearance three-dimensional geometric model is not constructed, executing a step that the VBwindows application platform calls an API (application programming interface) function of a CATIA COM (computer-graphics aided three-dimensional) component, and constructing the appearance three-dimensional geometric model according to the appearance geometric characteristic parameters by adopting an ActiveX automation technology;

if the first judgment result is that the construction of the appearance three-dimensional geometric model is finished, executing the construction process of the skin three-dimensional geometric model;

the process of constructing the skin three-dimensional geometric model comprises the following steps:

copying a ply section sketch of a ply i-1 in a skin into a geometric characteristic parameter of a current ply i to obtain a current ply geometric figure set; wherein i > 1; when i is 2, the layer section sketch of the layer i-1 in the skin is a connected shape section sketch corresponding to the shape three-dimensional geometric model;

equidistantly shifting the airfoil profile in each ply section sketch in the current ply geometric figure set outwards according to the preset ply thickness to obtain a shifted ply section sketch;

connecting wing-shaped front edge points in the deviated layer section sketch, and connecting upper and lower edge end points of the wing-shaped rear edge to obtain a connected layer section sketch;

the VB windows application platform calls a function command of a section curved surface to connect the connected ply section sketches into a curved surface to obtain a three-dimensional geometric model of the current ply i;

judging whether the current ply i reaches the preset ply number or not to obtain a second judgment result;

if the second judgment result is that the current ply i reaches the preset ply quantity, determining the three-dimensional geometric model of the current ply i as a skin three-dimensional geometric model;

and if the second judgment result is that the current ply i does not reach the preset ply quantity, adding 1 to the current ply i, and returning to the step of copying a ply section sketch of a ply i-1 in the skin into the geometric characteristic parameters of the current ply i to obtain a current ply geometric figure set.

The invention also provides a D-shaped girder blade modeling system, which comprises:

the parameter setting module is used for determining the appearance of the D-shaped girder paddle to be designed and the geometric characteristic parameters of the assembly; the geometric characteristic parameters of the shape and the assembly comprise geometric characteristic parameters of the shape, skin, counterweight, girder, leading edge fittings and trailing edge fittings;

the paddle appearance and each component construction module is used for importing the appearance and the component geometric characteristic parameters into a VBwindows application platform, the VB windows application platform calls an API (application program interface) function of a CATIA COM component, and an ActiveX (active automation technology) automation technology is adopted to construct an appearance three-dimensional geometric model and a component three-dimensional geometric model of the D-shaped girder paddle to be designed according to the appearance and the component geometric characteristic parameters; the component three-dimensional geometric model comprises a skin three-dimensional geometric model, a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model;

and the paddle three-dimensional model digital prototype building module is used for building a paddle three-dimensional model digital prototype by the appearance three-dimensional geometric model and the component three-dimensional geometric model.

Optionally, the blade shape and each component constructing module specifically include:

the appearance three-dimensional model building unit is used for the VB windows application platform to call an API (application program interface) function of the CATIA COM component and building an appearance three-dimensional geometric model according to the appearance geometric characteristic parameters by adopting an ActiveX (active automation) technology;

the skin three-dimensional model building unit is used for calling an API (application programming interface) function of a CATIA COM (computer-graphics aided three-dimensional) component by the VB windows application platform and building a skin three-dimensional geometric model according to the skin geometric characteristic parameters by adopting an ActiveX automation technology;

and the component three-dimensional model building unit is used for calling an API (application programming interface) function of the CATIA COM component by the VB windows application platform, and building a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge component three-dimensional geometric model and a trailing edge component three-dimensional geometric model according to the counterweight geometric characteristic parameter, the girder geometric characteristic parameter, the leading edge component geometric characteristic parameter and the trailing edge component geometric characteristic parameter by adopting an ActiveX automation technology.

Optionally, the shape three-dimensional model building unit specifically includes:

the airfoil type determining subunit is used for determining an airfoil type of each section of the profile and an airfoil data point set corresponding to the airfoil type from an airfoil database;

the appearance section sketch creating subunit is used for the VB windows application platform to call an API (application programming interface) function of the CATIA COM component and create each appearance section sketch according to the appearance geometric characteristic parameters;

the data point set importing subunit is used for importing the airfoil data point set into a corresponding outline profile sketch according to the airfoil type;

a first connecting subunit, configured to connect points on the upper and lower airfoil surfaces in the outline profile sketch, and close the trailing edge to obtain each closed outline profile sketch;

the second connecting subunit is used for connecting the front edge points of the wing profile in the closed profile sketch and connecting the upper edge end points and the lower edge end points of the rear edge of the wing profile to obtain the connected profile sketch;

and the appearance three-dimensional geometric model construction subunit is used for the VB windows application platform to call a function command of the section curved surface to connect the connected appearance section sketches into a curved surface to obtain the appearance three-dimensional geometric model.

Optionally, the skin three-dimensional model building unit specifically includes: the skin geometric model building unit is used for building a skin geometric model;

the judgment unit is used for the VB windows application platform to call an API (application program interface) function of a CATIA COM component and judge whether the construction of the appearance three-dimensional geometric model is completed or not to obtain a first judgment result; if the first judgment result is that the appearance three-dimensional geometric model is not constructed, returning to the appearance three-dimensional model construction unit; if the first judgment result is that the construction of the appearance three-dimensional geometric model is finished, executing a skin geometric model construction unit;

the skin geometric model building unit specifically comprises:

the replication sub-unit is used for replicating the ply section sketch of the ply i-1 in the skin into the geometric characteristic parameters of the current ply i to obtain a current ply geometric figure set; wherein i > 1; when i is 2, the layer section sketch of the layer i-1 in the skin is a connected shape section sketch corresponding to the shape three-dimensional geometric model;

the shifting subunit is used for shifting the airfoil profile in each ply section sketch in the current ply geometric figure set to the outside at equal intervals according to the preset ply thickness to obtain a shifted ply section sketch;

the third connecting subunit is used for connecting the wing-shaped front edge points in the deviated paving section sketch and connecting the upper edge end points and the lower edge end points of the wing-shaped rear edge to obtain a connected paving section sketch;

the fourth connecting subunit is used for the VB windows application platform to call a function command of a section curved surface to connect the connected ply section sketch into a curved surface so as to obtain a three-dimensional geometric model of the current ply i;

the judgment subunit is used for judging whether the current ply i reaches the preset ply number or not to obtain a second judgment result; if the second judgment result is that the current ply i reaches the preset ply quantity, determining the three-dimensional geometric model of the current ply i as a skin three-dimensional geometric model; and if the second judgment result is that the current ply i does not reach the preset ply quantity, adding 1 to the current ply i, and returning to the replication sub unit.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a modeling method and a modeling system for a D-shaped girder paddle. The invention realizes the automatic construction of the three-dimensional model, achieves the aim of rapid modeling, reduces the manual burden and shortens the development period.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a flow chart of a D-shaped girder blade modeling method according to embodiment 1 of the present invention;

FIG. 2 is a flowchart of the general steps for manipulating API objects in the CATIA secondary development technique of the present invention;

FIG. 3 is a schematic diagram of a D-beam blade modeling method according to embodiment 2 of the present invention;

FIG. 4 is a schematic view of a blade profile;

FIG. 5 is a schematic cross-sectional view of a D-beam blade;

FIG. 6 is a skin parameterization definition diagram;

FIG. 7 is a schematic view of parametric definition of a transverse circular counterweight of a blade;

FIG. 8 is a schematic diagram illustrating parametric definition of strip-shaped weights of blades;

FIG. 9 is a schematic view of a parametric definition of a leading edge member;

FIG. 10 is a schematic view of a parametric definition of a D-beam;

FIG. 11 is a schematic view of trailing edge construction parameterization definition;

FIG. 12 is a flow chart of the construction of a three-dimensional geometric model of the profile of a blade;

FIG. 13 is a flow chart of a blade skin three-dimensional geometric model construction;

FIG. 14 is a flow chart of the construction of a three-dimensional geometric model of the counterweight, longerons, leading edge fitting, and trailing edge fitting.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

The invention provides a D-shaped girder paddle automatic modeling method based on CATIA secondary development, which aims to: the method aims at the parametric definition and the automatic modeling method of the D-shaped girder blade, improves the automation degree in the design process of the D-shaped girder blade, converts the complicated modeling process into the setting of key parameters of the blade (including the blade appearance and internal components), and can automatically and efficiently complete the three-dimensional modeling work of the D-shaped girder blade through parameter driving after the parameters are input.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example 1

Fig. 1 is a flowchart of a D-shaped girder blade modeling method according to embodiment 1 of the present invention.

Referring to fig. 1, the D-shaped girder blade modeling method of the present embodiment includes:

step S1: determining the shape of a D-shaped girder paddle to be designed and geometric characteristic parameters of components; the shape and assembly geometric characteristic parameters comprise shape geometric characteristic parameters, skin geometric characteristic parameters, counterweight geometric characteristic parameters, girder geometric characteristic parameters, leading edge fitting geometric characteristic parameters and trailing edge fitting geometric characteristic parameters.

In the step, characteristic parameters are defined according to a parameterization definition method of the D-shaped girder paddle, and the shape of the D-shaped girder paddle to be designed and the geometric characteristic parameters of the components are obtained. Wherein:

the skin geometric characteristic parameters comprise the distance from a quadrilateral laying layer upper edge point of the spanwise upper skin to the end face of the propeller root section, the distance from a quadrilateral laying layer lower edge point of the spanwise upper skin to the end face of the propeller root section, the distance from a chord-wise upper skin laying layer upper edge point to the end face of the propeller root section, the distance from a chord-wise upper skin laying layer lower edge point to the end face of the propeller root section and the thickness of the skin;

Step S2: and importing the geometric characteristic parameters of the shape and the assembly into a VB windows application platform, calling an API (application program interface) function of a CATIACOM assembly by the VBwindows application platform, and constructing a three-dimensional geometric model of the shape and the three-dimensional geometric model of the assembly of the D-shaped girder blade to be designed according to the geometric characteristic parameters of the shape and the assembly by adopting an ActiveX automation technology.

The component three-dimensional geometric model comprises a skin three-dimensional geometric model, a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model.

In the step, for the construction of the appearance three-dimensional geometric model and the component three-dimensional geometric model, the general step thought of the CATIA secondary development technology for operating the API object is as follows: firstly, a part body is required to be created, a geometric figure set (a mixed element set) is created in the part body, a two-dimensional sketch is drawn in the geometric figure set and used for describing the profile airfoil profile of each section of the blade, then the blade airfoil profile is connected into a curved surface, an envelope body is constructed, and finally a solid model is created according to the modeling of the envelope body. Referring to fig. 2, the general steps of operating API objects by the CATIA secondary development technique are as follows:

the method comprises the following steps: and acquiring an Application object of the API, acquiring a Documents object in the Application object, acquiring a Part object in the Documents object, and completing calling and creating of the Part body.

Step two: acquiring an origin elements object in a part body to create a coordinate system, acquiring a mixed element set HybirdBodes in the part body, adding a HybirdBody object (creating a geometry set) by an Add () method, acquiring a HybirdSketchs object from the HybirdSketchs object to create a HybirdSketch object, acquiring a construction class Factory2D in the HybirdSketch object, and drawing a profile sketch feature.

Step three: after drawing of the sketch is completed, acquiring a reference element object and a construction class hybrid ShapeFactory through a Part object, then calling a construction method and the drawn sketch object to create a surface and an envelope, and adding the created mixed elements into a geometric figure set through an appendix hybrid Shape.

Step four: after a curved surface is created, an entity needs to be built on the basis of the curved surface, in the creation of the entity, an entity set Bodies needs to be obtained from a Part object, a Body object is added through an Add () method, then a construction class ShapeFactory is obtained from the Part, and the created enveloping Body model (an appearance three-dimensional geometric model and a component three-dimensional geometric model) is converted into a three-dimensional entity model.

The step S2 specifically includes:

21) and the VB windows application platform calls an API (application program interface) function of the CATIACOM component, and constructs a shape three-dimensional geometric model according to the shape geometric characteristic parameters by adopting an ActiveX automation technology. The method specifically comprises the following steps:

and determining an airfoil type of each section of the profile and an airfoil data point set corresponding to the airfoil type from an airfoil database.

And the VB windows application platform calls an API (application program interface) function of the CATIACOM component and creates various profile sketch maps according to the profile geometric characteristic parameters.

And leading the airfoil data point set into a corresponding outline profile sketch according to the airfoil type.

And connecting points on the upper airfoil surface and the lower airfoil surface in the outline profile sketch, and closing the rear edge to obtain the closed outline profile sketch.

And connecting the front edge points of the wing profile in the closed profile sketch, and connecting the upper edge end points and the lower edge end points of the rear edge of the wing profile to obtain the connected profile sketch.

22) And the VB windows application platform calls an API (application program interface) function of the CATIACOM component, and an ActiveX (active X) automation technology is adopted to construct a skin three-dimensional geometric model according to the skin geometric characteristic parameters. The method specifically comprises the following steps:

and the VB windows application platform calls an API function of a CATIACOM component, and judges whether the construction of the appearance three-dimensional geometric model is completed or not to obtain a first judgment result.

If the first judgment result is that the appearance three-dimensional geometric model is not constructed, executing the step 21); and if the first judgment result is that the construction of the appearance three-dimensional geometric model is finished, executing the construction process of the skin three-dimensional geometric model.

copying a ply section sketch of a ply i-1 in a skin into a geometric characteristic parameter of a current ply i to obtain a current ply geometric figure set; wherein i > 1; and when i is 2, the layer section sketch of the layer i-1 in the skin is a connected shape section sketch corresponding to the shape three-dimensional geometric model.

And (3) equidistantly shifting the airfoil profile in each layer section sketch in the current layer geometric figure set outwards at equal intervals according to the preset layer thickness to obtain the shifted layer section sketch.

And connecting wing-shaped front edge points in the deviated layer cross-section sketch, and connecting upper and lower edge end points of the wing-shaped rear edge to obtain the connected layer cross-section sketch.

And the VB windows application platform calls a function command of the section curved surface to connect the connected ply section sketches into a curved surface to obtain a three-dimensional geometric model of the current ply i.

And judging whether the current ply i reaches the preset ply number or not to obtain a second judgment result. If the second judgment result is that the current ply i reaches the preset ply quantity, determining the three-dimensional geometric model of the current ply i as a skin three-dimensional geometric model; and if the second judgment result is that the current ply i does not reach the preset ply quantity, adding 1 to the current ply i, and returning to the step of copying a ply section sketch of a ply i-1 in the skin into the geometric characteristic parameters of the current ply i to obtain a current ply geometric figure set.

23) And the VB windows application platform calls an API (application program interface) function of the CATIACOM component, and a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model are constructed according to the counterweight geometric characteristic parameters, the girder geometric characteristic parameters, the leading edge fitting geometric characteristic parameters and the trailing edge fitting geometric characteristic parameters by adopting an ActiveX automation technology.

Step S3: and constructing a digital prototype of the three-dimensional model of the blade by using the three-dimensional geometric model of the appearance and the three-dimensional geometric model of the assembly.

The D-shaped girder blade modeling method of the embodiment realizes the automatic construction of a three-dimensional model, achieves the aim of rapid modeling, reduces the manual burden and shortens the development period.

A more specific example is provided below.

Example 2

Fig. 3 is a schematic diagram of a D-shaped girder blade modeling method according to embodiment 2 of the present invention. Referring to fig. 3, the D-shaped girder blade modeling method of the present embodiment includes:

the method comprises the following steps: according to the parameterization definition method of the D-shaped girder blade, geometric characteristic parameters for describing the shape of the D-shaped girder blade and components (skin, D-shaped girder, front edge member and rear edge strip) of the D-shaped girder blade are determined, so that a parameter model of the shape of the D-shaped girder blade and the components of the D-shaped girder blade is established, and a foundation is laid for realizing the automatic construction of a three-dimensional model of the D-shaped girder blade driven by parameters through the blade parameter setting and the three-dimensional geometric modeling algorithm on a VB windows platform.

Step two: the VB windows platform is connected with the CATIA 5 COM component, a secondary development interface (API) and an ActiveX automation technology provided by the CATIA V5 COM component are used, an API interface function of the CATIA is called through the VB windows application platform, and the access of the CATIA and the calling of an internal function module of the CATIA are achieved. And a foundation is laid for the design of the subsequent three-dimensional modeling algorithm of the D-shaped girder paddle shape and the components thereof.

Step three: on the basis of completing the establishment of a parameter model of the blade of the D-shaped girder and the configuration of the CATIA COM component, a CATIAAPI interface function is called to design a three-dimensional geometric modeling algorithm of the blade appearance of the D-shaped girder, a skin three-dimensional geometric modeling algorithm, a three-dimensional geometric modeling algorithm of a leading edge component, a three-dimensional geometric modeling algorithm of the D-shaped girder and a three-dimensional geometric modeling algorithm of a trailing edge strip, so that the establishment of the blade appearance and the three-dimensional geometric model of the component can be gradually completed according to certain steps after the set parameter model.

Step four: the method comprises the steps of setting characteristic parameters of the D-shaped girder paddle appearance, the skin, the girder, the trailing edge and the leading edge component in a parameter setting module, establishing a paddle parameter data model, acquiring set data by a VB Windows platform, sequentially introducing an appearance three-dimensional geometric modeling algorithm, a skin three-dimensional geometric modeling algorithm, a leading edge component three-dimensional geometric modeling algorithm, a D-shaped girder three-dimensional geometric modeling algorithm and a trailing edge strip three-dimensional geometric modeling algorithm, realizing the construction of a paddle three-dimensional digital prototype, and displaying the constructed three-dimensional model digital prototype in a CATIA software window.

The parameterization definition method of the D-shaped girder paddle in the first step is as follows:

referring to fig. 4, the blade of the present embodiment mainly includes a root section, an airfoil section, and a transition section.

Referring to FIG. 5, a D-beam blade internal profile assembly includes: leading edge beam member 1 (leading edge member), counterweight 2, D-shaped girder 3, skin 4, Nomex honeycomb filler 5, trailing edge strip 6 (trailing edge member).

Referring to fig. 6, for parametric definition of the skin of the D-beam blade, it is necessary to define the distance X from 4 points on the upper and lower edges of the gray paving block with 4-sided polygon in the span direction to the end face of the blade root section₁、X₂、X₃、X₄It is also necessary to define the distance Y from the upper and lower edges of the skin lay-up to the end face of the root section in the chordwise direction₁、Y₂And the thickness h of the layer of skin. The blade airfoil section and the transition section are mainly defined, and the skin laying of the root part of the blade generally adopts a full-laying mode. In addition, the skin is generally composed of a plurality of layers, and the number of the layers to be laid needs to be set when the skin is designed.

Referring to fig. 7-8, the parametric definition of blade weights is divided into two categories, circular weights and strip weights. For a circular counterweight, the distance from the starting end to the end face of the blade root section is defined as X in the spanwise direction₅The distance from the tail end to the end face of the blade root section is X₆The radius R and the center coordinate P (y, z) of the circle are defined on the chord-wise section; for the strip-shaped balance weight, the distance from the starting end to the end face of the blade root section is defined as X in the spanwise direction₇The distance from the tail end to the end face of the blade root section is X₈The distance from the top edge point to the Z axis (front edge) is defined as Y on the chord-wise section_vThe distance from the lower edge point to the Z axis is Y_u。

Referring to fig. 9, for the leading edge member, the definition method is similar to that of a strip counterweight, the distance from the starting end to the end face of the blade root segment and the distance from the tail end to the end face of the blade root segment are defined in the spanwise direction, and the distance from the upper edge point to the Z axis is defined as Y in the chordwise section plane₃The distance from the lower edge point to the Z axis is Y₄。

Referring to FIG. 10, the parameterization of the D-shaped girder defines the distance X from the starting end to the end face of the root section in the span direction₉The distance from the tail end to the end face of the blade root section is X₁₀In chord direction sectionIn the above, the upper edge and the lower edge of the inner profile of the D girder are the result of inward deviation of the peripheral airfoil profile by delta, and the distance between the inner profile and the front edge, namely the Z axis, is defined as Y₅、Y₆The distance between the outer contour far end and the Z axis is Y₇And an offset δ.

Referring to fig. 11, the parametrization of the back edge strip defines the distance X from the starting end to the end face of the root segment in the spanwise direction₁₁The distance from the tail end to the end face of the blade root section is X₁₂The distance between the upper edge point and the Z axis is defined as Y on the chord-wise section_v1The distance from the lower edge point to the Z axis is Y_u1。

The following describes specific construction processes of a three-dimensional geometric model of the appearance of the blade, a three-dimensional geometric model of the skin, a three-dimensional geometric model of the counterweight, a three-dimensional geometric model of the girder, a three-dimensional geometric model of the leading edge fitting and a three-dimensional geometric model of the trailing edge fitting.

Referring to fig. 12, the process of constructing the three-dimensional geometric model of the blade shape includes: firstly, setting blade appearance parameters including the spanwise length of the blade, the length of a blade root section, the length of an airfoil section, the number of spanwise sections, section positions, the chord length of each airfoil section, the chord position of each airfoil section and the torsion angle of each section. In the setting link of the airfoil model, the airfoil model list, the corresponding parameters and the graphic display are provided with data by an airfoil database. And then accessing a CATIA API, calling a CATIA internal function, creating a geometric figure set, creating a sketch of each section according to the setting of geometric parameters of the blade appearance, introducing an airfoil data point set into each section according to the setting of airfoil type of each section, connecting the data point sets of the upper airfoil surface and the lower airfoil surface through a sample line command, sealing the rear edge, connecting the front edge points of the airfoils on each section through the sample line, connecting the upper edge end points and the lower edge end points of the rear edge through the sample line after the airfoil profile setting of each section is completed, connecting each section into a curved surface through a function command of a multi-section curved surface after the airfoil profile setting is completed, obtaining the theoretical appearance of the blade, and displaying the three-dimensional shape in CATIA software after the theoretical appearance is generated.

Referring to fig. 13, the process of constructing the skin three-dimensional geometric model of the blade is as follows: firstly, setting the needed number of the layers, the thickness of each layer and the geometric dimension of each layer. And then accessing the CATIA API interface to call a CATIA internal function module. And then judging whether the theoretical shape of the blade is built or not, wherein the theoretical shape of the blade is a bottom layer foundation for building a skin, if not, executing the automatic blade shape modeling process again, if so, copying the characteristics of the profile airfoil sketch in the previously created geometric figure set of the theoretical shape of the blade into a newly created geometric figure set Vj (j is initially set to be 1), and if so, V1 is a layer 1, and equidistantly and outwards shifting the airfoil profile in each profile sketch in the new geometric figure set Vj according to the set layer thickness parameter value. After the deviation is finished, connecting the front edge end point of the new airfoil profile, the upper edge end point of the rear edge and the lower edge end point of the rear edge through sample lines, then calling a multi-section surface function to connect each deflected airfoil profile extending upwards from the blade to obtain a new blade outline curved surface where the ply j is located, then projecting the new blade outline curved surface onto the generated curved surface by adopting a projection command according to the set geometric shape of the ply j, and obtaining the curved surface model of the ply j through curved surface cutting. At this time, whether the number j of the constructed layers is consistent with the number i of the set layers needs to be judged, if not, a section sketch in the geometric figure set of the layers j is copied into a newly-built geometric figure set Vj (j is j +1), a new layer is created until the number of the layers is consistent with the number (j is i) of the set layers, and a needed skin curved surface is obtained and displayed in the CATIA.

Referring to fig. 14, the process of constructing the counterweight three-dimensional geometric model, the girder three-dimensional geometric model, the leading edge fitting three-dimensional geometric model, and the trailing edge fitting three-dimensional geometric model is as follows: setting the geometric dimension of the D-shaped girder, setting the number and the positions of the sections in the unfolding direction, accessing a CATIAAPI interface, creating each section in the unfolding direction according to the set position, drawing the section outline of the assembly according to the geometric dimension of the assembly, connecting the end points of the section assembly outline through a sample line, and calling a multi-section curved surface function to connect the sections to obtain the curved surface model of the assembly. And finally shown in CATIA.

According to the modeling method for the D-shaped girder paddle in the embodiment, firstly, the shape and each component of the D-shaped girder paddle are parameterized and defined, then, a CATIA secondary development technology is adopted, API objects of the CATIA are called through VB programming programs to realize calling of CATIA modeling functions, and after the setting of key parameters of the shape and each component is completed, the three-dimensional automatic modeling work of the D-shaped girder paddle is realized by combining an automatic modeling method for the D-shaped girder paddle. The invention realizes the automatic construction of the three-dimensional model, achieves the aim of rapid modeling, reduces the manual burden and shortens the development period.

Example 3

the parameter setting module is used for determining the appearance of the D-shaped girder paddle to be designed and the geometric characteristic parameters of the assembly; the shape and assembly geometric characteristic parameters comprise shape geometric characteristic parameters, skin geometric characteristic parameters, counterweight geometric characteristic parameters, girder geometric characteristic parameters, leading edge fitting geometric characteristic parameters and trailing edge fitting geometric characteristic parameters.

The paddle appearance and each component construction module is used for importing the appearance and the component geometric characteristic parameters into a VBwindows application platform, the VB windows application platform calls an API (application program interface) function of a CATIA COM component, and an ActiveX (active automation technology) automation technology is adopted to construct an appearance three-dimensional geometric model and a component three-dimensional geometric model of the D-shaped girder paddle to be designed according to the appearance and the component geometric characteristic parameters; the component three-dimensional geometric model comprises a skin three-dimensional geometric model, a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model.

As an optional embodiment, the skin geometric characteristic parameters comprise the distance from an upper edge point of a quadrangular layer of a spanwise upper skin to the end face of a propeller root section, the distance from a lower edge point of the quadrangular layer of the spanwise upper skin to the end face of the propeller root section, the distance from an upper edge point of a chord-wise upper skin layer to the end face of the propeller root section, the distance from a lower edge point of a chord-wise upper skin layer to the end face of the propeller root section and the thickness of the skin;

As an optional implementation manner, the blade profile and each component building module specifically include:

and the appearance three-dimensional model building unit is used for calling an API (application program interface) function of the CATIA COM component by the VB windows application platform and building an appearance three-dimensional geometric model according to the appearance geometric characteristic parameters by adopting an ActiveX automation technology.

And the skin three-dimensional model building unit is used for calling an API (application programming interface) function of the CATIA COM component by the VB windows application platform and building a skin three-dimensional geometric model according to the skin geometric characteristic parameters by adopting an ActiveX automation technology.

As an optional implementation manner, the outline three-dimensional model building unit specifically includes:

and the airfoil type determining subunit is used for determining an airfoil type of each section of the profile and an airfoil data point set corresponding to the airfoil type from an airfoil database.

And the outline profile sketch creating subunit is used for the VB windows application platform to call an API (application programming interface) function of the CATIA COM component and creating each outline profile sketch according to the outline geometric characteristic parameters.

And the data point set importing subunit is used for importing the airfoil data point set into a corresponding outline profile sketch according to the airfoil type.

And the first connecting subunit is used for connecting points on the upper airfoil surface and the lower airfoil surface in the outline profile sketch and closing the rear edge to obtain each closed outline profile sketch.

And the second connecting subunit is used for connecting the front edge points of the wing profile in the closed profile sketch, and connecting the upper edge end points and the lower edge end points of the rear edge of the wing profile to obtain the connected profile sketches.

As an optional implementation manner, the skin three-dimensional model building unit specifically includes: the device comprises a judging unit and a skin geometric model building unit.

The judgment unit is used for the VB windows application platform to call an API (application program interface) function of a CATIA COM component and judge whether the construction of the appearance three-dimensional geometric model is completed or not to obtain a first judgment result; if the first judgment result is that the appearance three-dimensional geometric model is not constructed, returning to the appearance three-dimensional model construction unit; and if the first judgment result is that the construction of the appearance three-dimensional geometric model is finished, executing a skin geometric model construction unit.

The skin geometric model building unit specifically comprises:

the replication sub-unit is used for replicating the ply section sketch of the ply i-1 in the skin into the geometric characteristic parameters of the current ply i to obtain a current ply geometric figure set; wherein i > 1; and when i is 2, the layer section sketch of the layer i-1 in the skin is a connected shape section sketch corresponding to the shape three-dimensional geometric model.

And the shifting subunit is used for shifting the airfoil profile in each ply section sketch in the current ply geometric figure set to the outside at equal intervals according to the preset ply thickness to obtain the shifted ply section sketch.

And the third connecting subunit is used for connecting the wing-shaped front edge points in the deviated paving section sketch and connecting the upper edge end points and the lower edge end points of the wing-shaped rear edge to obtain the connected paving section sketch.

And the fourth connecting subunit is used for the VB windows application platform to call a function command of the section curved surface to connect the connected ply section sketch into a curved surface so as to obtain a three-dimensional geometric model of the current ply i.

The D-shaped girder blade modeling system of the embodiment realizes automatic construction of a three-dimensional model, achieves the purpose of rapid modeling, reduces the manual burden and shortens the development period.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A D-shaped girder blade modeling method is characterized by comprising the following steps:

2. The method of modeling a D-girder blade according to claim 1,

3. The method for modeling the D-shaped girder blade according to claim 1, wherein the importing the geometric characteristic parameters of the shape and the component into a VB windows application platform, the VB windows application platform calling an API interface function of a CATIA COM component, and constructing a three-dimensional geometric model of the shape and the three-dimensional geometric model of the component of the D-shaped girder blade to be designed according to the geometric characteristic parameters of the shape and the component by using an ActiveX automation technology specifically comprises:

4. The method for modeling a D-shaped girder blade according to claim 3, wherein the VB windows application platform calls an API interface function of a CATIA COM component, and constructs a three-dimensional geometric model of the shape according to the geometric characteristic parameters by using an ActiveX automation technology, specifically comprising:

5. The method for modeling the blade of the D-shaped girder according to claim 4, wherein the VB windows application platform calls an API interface function of a CATIA COM component, and constructs a skin three-dimensional geometric model according to the skin geometric characteristic parameters by using an ActiveX automation technology, specifically comprising:

if the first judgment result is that the appearance three-dimensional geometric model is not constructed, executing a VB windows application platform to call an API (application program interface) function of a CATIA COM component, and constructing the appearance three-dimensional geometric model according to the appearance geometric characteristic parameters by adopting an ActiveX automation technology;

6. A D-girder blade modeling system, comprising:

the paddle appearance and each component construction module is used for importing the appearance and the component geometric characteristic parameters into a VB windows application platform, the VB windows application platform calls an API (application program interface) function of a CATIA COM component, and an ActiveX (active X) automation technology is adopted to construct an appearance three-dimensional geometric model and a component three-dimensional geometric model of the D-shaped girder paddle to be designed according to the appearance and the component geometric characteristic parameters; the component three-dimensional geometric model comprises a skin three-dimensional geometric model, a counterweight three-dimensional geometric model, a girder three-dimensional geometric model, a leading edge fitting three-dimensional geometric model and a trailing edge fitting three-dimensional geometric model;

7. A D-girder blade modeling system according to claim 6,

8. The D-beam blade modeling system of claim 6 wherein the blade profile and component building blocks specifically comprise:

9. The D-shaped girder blade modeling system according to claim 8, wherein the outer three-dimensional model building unit specifically includes:

10. The D-shaped girder blade modeling system according to claim 9, wherein the skin three-dimensional model building unit specifically includes: the skin geometric model building unit is used for building a skin geometric model;

the skin geometric model building unit specifically comprises: