Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F30/00—Computer-aided design [CAD]
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F30/00—Computer-aided design [CAD]
  • G06F30/10—Geometric CAD
  • G06F30/17—Mechanical parametric or variational design

Definitions

• the present invention relates to the field of the design of complex mechanical devices such as engine parts, including but not exclusively aircraft turbine engines.
• mechanical device is also understood to mean any device consisting of an assembly of components, such as for example an electronic card, an item of equipment or any other device of this type.
• the geometric representation of the entire mechanical device is generally called the numerical model, or CAD model of the device, the geometric representations being stored in one or more computer files, called CAD files.
• CAD software is generally associated with another software whose function is notably to manage the nomenclature of the parts of the mechanical device.
• PLM Process Lifecycle Management
• the objective is to manage the nomenclatures in configuration, ie to filter the nomenclatures according to a criterion.
• a complex assembly can have several variants: the nomenclature keeps the same structure but some parts are modified. This happens especially when we slightly derive a motor from an existing engine, or when we have alternatives on a component (options), or when we modify a component for a security problem during the engine life.
• the nomenclature is derived from several alternatives, each associated with an employment context.
• the PLM serves in particular to filter the right nomenclature for a given context.
• the nomenclature is a list of the various parts, or components, constituting the mechanical device. It indicates in particular the assemblies and subsets of components of the mechanical device.
• the nomenclature of a helicopter turbine engine includes a set of components called “compression stage", which assembly contains the components "compressor wheel” and "diffuser".
• compression stage which assembly contains the components "compressor wheel” and "diffuser”.
• first CAD file containing the geometric representation of the compressor wheel
• second CAD file containing a geometric representation of the diffuser
• third CAD file containing pointers to the aforementioned first and second files as well as a matrix of spatial positioning giving the position of the wheel of compressor relative to the diffuser. Opening the third CAD file makes it possible to view and modify the geometrical representation of the assembly.
• a first object of the present invention is to remedy this drawback by proposing a data structure of a nomenclature of a mechanical device, the nomenclature comprising at least one set including at least one element taken from a component or a set of components. , this data structure for actively linking the nomenclature to the CAD model of said device.
• the invention achieves its object by the fact that said structure comprises;
• an identifier of the element at least one link between the identifier of the element and at least one CAD file containing the geometric representation of the element;
• Such a data structure is intended to be associated with a CAD model containing at least one CAD type file format.
• the invention makes it possible in particular to synchronize the CAD model, that is to say the set of CAD files relating to the mechanical device, with the nomenclature.
• the structure of the CAD model can advantageously be imposed by the nomenclature, a modification made in the nomenclature that is reflected in the CAD model.
• the present data structure advantageously contains the spatial positioning vector of the element or elements.
• An interest is that in case of loss of the CAD data file, the data structure of the nomenclature makes it possible to very easily find the spatial positioning of the element in the set, and thus makes it possible to reconstruct a data file.
• the data structure also comprises a nomenclature link between the identifier of the set and the identifier of the element.
• the data structure further comprises means for updating the spatial positioning vector from the spatial positioning matrix contained in the data file.
• this change is updated in the data structure and therefore in the BOM management software. It is therefore understood that this operation makes it possible to synchronize the nomenclature and the CAD model with regard to the spatial position of the components of the assembly.
• said at least one element is a component and said data structure comprises a first link between the identifier of the component and a first CAD file containing a geometric representation of the component in a first format, and at least a second link between (Identifier of component and a second CAD file containing a geometric representation of the component in a second format.
• the first format is a format readable by a first software package
• the second format is a format readable by a second software package.
• the first format may be the native format of the first software or a translated format understandable by the first software package.
• the second format may be the native format of the second package or a translated format understandable by the second package.
• a geometric representation in a translated format is most often readable but not modifiable.
• native CAD file the file created by a CAD software package.
• the first format of the first CAD file is the native format of the first software package, while the second format is a translated format readable by the second software package, whereby two software packages working in different formats can be coexisted.
• the data structure further comprises; a first link between (identifier of the set and a first data file containing at least:
• the first data file is written in the first format, while the second data file is written in the second format.
• the first data file is written in the first format means that it is at least readable by the package having as file format this first format.
• the second data file means that it is at least readable by the package having as file format this first format.
• the first and second data files are native CAD files.
• the data files do not directly contain the CAD files containing the geometric representations of the components of the set but allow the package to find these files, thanks to the pointers.
• the data structure makes it possible to coexist two packages having different file formats. For example, if the component was drawn using the first package in the first format, and the user wishes to modify the component in the set, it will open the first data file using the first package.
• the second CAD file will be a CAD file translated into the second format obtained from the first CAD file.
• the user will be able to visualize the component of the set by opening the second data file using the second software package.
• one of the two formats is of the CA ⁇ A V5 type (product marketed by DASSAULT SYSTEMES).
• at least one of the two software packages is CA ⁇ A ⁇ 5, while the other can be for example CADDS (product marketed by the company PTC).
• the data structure further comprises, for each element, a link to a file containing a geometric representation of this element in a neutral format.
• the present invention also relates to a computer-readable recording medium on which the data structure according to the invention is stored.
• Such a recording medium is for example but not exclusively a hard disk, a non-volatile memory, a CD or a DVD.
• the present invention furthermore relates to a method of adding a new component to a pre-existing assembly of a nomenclature of a mechanical device, in particular but not exclusively a helicopter turbine engine, said nomenclature having a structure of data according to the invention, said structure being intended to be associated with a CAD model comprising several file formats, said method comprising:
• a step of creating, in the data structure, a link between the identifier of the new component and the CAD file written in this other format a step of creating a first data file associated with the new set, written in the first format and containing a new spatial positioning matrix consisting of the spatial positioning matrix of the elements of the pre-existing set and a positioning vector of the new component, as well as pointers to the CAD files, written in the first format, associated with the geometric representations of the elements to the geometric representation of the pre-existing set and a pointer to the native CAD file; a step of creating, in said data structure, a first link between the identifier of the new set and the first data file;
• the positioning vectors of the elements of the new set are advantageously updated from the positioning matrix.
• the BOM is synchronized with the CAD model.
• the invention further relates to a computer program comprising instructions for performing the steps of the adding method according to the invention when said program is executed by a computer.
• This computer program preferably belongs to the management software of the nomenclature.
• This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in any other form desirable shape.
• the invention also relates to a recording medium readable by a computer on which the computer program according to the invention is recorded, for example a hard disk.
• the present invention relates to a method of removing a component, called the component to be deleted, from a pre-existing assembly of a nomenclature of a mechanical device, in particular but not exclusively a helicopter turbine engine, said nomenclature having a data structure according to the invention associated with a CAD model having a plurality of file formats, said method comprising:
• a step of updating, in the data structure, positioning vectors of the elements of the new set from the new spatial positioning matrix is therefore accompanied by the creation of a new data file associated with the new set which no longer includes a pointer to the CAD file containing the geometric representation of the deleted element, or matrix data relating to the spatial positioning of this deleted element.
• the data files associated with the pre-existing set are deleted.
• the invention synchronizes the BOM and the CAD model when adding or deleting an item in the BOM.
• the invention also relates to a computer program comprising instructions for carrying out the steps of the method deletion according to the invention when said program is executed by a computer.
• This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in any other form desirable shape.
• This program belongs in preference to the management software of the nomenclature.
• the invention relates to a computer-readable recording medium on which the aforementioned computer program is recorded.
• Such a recording medium is for example but not exclusively a hard disk, a non-volatile memory, a CD or a DVD.
• the present invention also relates to a method of designing or manufacturing a mechanical device, for example a turbomachine, said device having a nomenclature which comprises at least one set including at least one element taken from a component or a set of components, a method in which one generates:
• a spatial positioning vector of said element is calculated, and in which a data structure of the nomenclature comprising:
• the design method also comprises a method for adding a new component to a pre-existing assembly of the nomenclature of the mechanical device, the data structure of the nomenclature being associated with a CAD model presenting a plurality of file formats, said adding method comprising: - a step of creating, in said data structure, an identifier of a new set containing the elements of the pre-existing set and the new component;
• the design method further comprises a method of deleting a component, called the component to be deleted, in a pre-existing assembly of the nomenclature of the mechanical device, said data structure of the nomenclature being associated with a CAD model presenting several file formats, the method of deletion comprising:
• the above-mentioned design method is implemented by means of a computer program stored on a recording medium.
• FIG. 1 is the geometric representation of a pre-existing assembly of the nomenclature of a mechanical device, namely a rotating assembly of the turbine with gas of a helicopter turbine engine, this assembly comprising a shaft and a compressor wheel;
• FIG. 2A is the geometric representation of a first component of the rotary assembly of FIG. 1, namely the compressor wheel;
• Figure 2B is the geometric representation of a second component of the mechanical device of Figure 1, namely the shaft;
• Figure 2C is the geometric representation of a third component, namely the high pressure turbine wheel;
• FIG. 3 is the geometric representation of a new set of the nomenclature obtained after adding the third component of FIG. 2C to the pre-existing assembly of FIG. 1;
• FIG. 4 represents the data structure according to the invention of the nomenclature of the pre-existing set of FIG. 1, and the associated CAD model;
• FIG. 5 represents the data structure according to the invention of the nomenclature of the new set of FIG. 3, and the associated CAD model;
• - Figure 6 shows the data structure according to the invention of the nomenclature of the assembly of Figure 5 after removal of the second component, and the associated CAD model
• - Figure 7 is a computer on which is installed a BOM management software incorporating the data structure according to the invention.
• FIG. 8 illustrates a recording medium readable by the computer of FIG. 7 on which the data structure according to the invention is stored.
• the example is the design of a mechanical device from a helicopter-type aircraft turbine engine.
• the invention is not limited to the design of a helicopter turbine engine but can be used for the design of any type of device consisting of several components and having a nomenclature.
• the invention relates to devices for which the industrial design is accompanied by the creation and management of computer files of the CAD type containing the geometric representations of the various parts that constitute the device.
• FIG. 1 shows a rotary unit 10 of a gas turbine of a helicopter turbine engine, this rotary unit comprising a rotation shaft 12 on which is mounted a centrifugal compressor wheel 14.
• This group is therefore consisting of two parts, namely the compressor wheel, shown in Figure 2A, and the rotation shaft, shown in Figure 2B.
• the rotation shaft 12 constitutes a first component
• the compressor wheel 14 constitutes a second component
• the rotary unit 10 constitutes a set of components, hereinafter called "set”.
• a set of components can have two types of elements: a component or a set of components, whereby a tree can be defined.
• This nomenclature is managed by a nomenclature management software, often called PLM.
• the nomenclature has a data structure 100 which will be explained with reference to FIGS. 4 to 6.
• the data structure 100 comprises an identifier 102 of the set "rotary group 10", an identifier 104 of the first component "rotation shaft 12" and an identifier 106 of the second component "wheel of rotation”.
• compressor 14
• Identifier is meant the article reference assigned to the component or set of components.
• the identifier preferably consists of a number or code identifying the associated element.
• the identifiers 104 and 106 of the first and second components are connected to the identifier 102 of the set by LN1 and LN2 nomenclature links previously created.
• the data structure
• 100 further comprises, for each element 102, 104, 106, a link L1, L2, L3 to a CAD file FN1, FN2, FN3 containing the geometric representation of this element in a neutral format.
• the identifier 104 of the first component is linked, by the link L2, to the CAD file FN2 containing the geometric representation of the tree 12, in a neutral format.
• the user can therefore view this tree 12 directly in the management software of the nomenclature.
• the neutral format, of the STEP or IGES type is preferably obtained by translating, in this neutral format, the native CAD file, that is to say the CAD file created by the software package with which this component has been drawn.
• the native 204N file of the first component 12 has been generated in a first CAD1 file format by a first CAD package, while the native CAD file 206N of the second component 14 has been generated in a second CAD2 file format. by a second CAD package.
• a CAD file translated 204T in a format compatible with the second format, for example a neutral format was generated by an electronic translator, known moreover, from the native 204N CAD file written in the first format, whereas a file CAD translated 206T in a format compatible with the first format, for example a neutral format, was generated by a translator from the native CAD file 206N written in the second format.
• the translated CAD file 204T is readable in the second package. This means that the geometric representation of the first component 12 is viewable in the second package, but can not be modified with this second package.
• the CAD file translates 2OiT is readable in the first software package. This means that the geometric representation of the second component 14 is viewable in the first software package, but can not be modified with this first software package.
• the data structure 100 comprises a first link P1 between the identifier 104 of the first component 12 and the native CAD file 204N containing the geometric representation of the first component in the first format, and a second link P2 between the first component identifier 104 of the first component 12 and the translated CAD file 204T also containing the geometric representation of the first component.
• the data structure 100 comprises a first link Q1 between the identifier 106 of the second component 14 and the native CAD file 206N containing the geometric representation of the second component in the second format, and a second link Q2 between the identifier 106 of the second second component 14 and the translated CAD file 206T also containing the geometric representation of the second component.
• the data structure 100 comprises a first link R1 between the identifier 102 of the set and a first data file El, written in the first format, on the one hand, and a second link R2 between the identifier 102 of the set and a second data file E2, written in the second format, on the other hand.
• the first data file El contains a first pointer PT1 to the native CAD file 204N of the first component 12, and a second pointer PT2 to the translated CAD file 206T of the second component 14.
• the data file E1 further contains a spatial positioning matrix M1 of the first and second components 12,14 in the assembly constituted by the rotary group 10.
• the positioning matrix M1 thus contains the matrix data relating to the positioning of these two components.
• the user can modify the geometric representation of the first component 12 while being able to view the second component 14. This is particularly advantageous if the modification to be made to the first component 12 must take into account the shape of the second component 14.
• the second data file E2 contains a positioning matrix M2 similar to the matrix M1, and pointers QT1 and QT2 to the CAD files 204T and 206N of the first and second components.
• the latter searches for the geometric representations of the first and second components through the first and second pointers QT1, QT2, and then spatially positions the first component 12 and the second component 14 using the data of the matrix M2. It is therefore understood that the opening of the second data file E2, with the second software package, makes it possible in particular to display the rotary group 10 as seen in FIG. 1, although the first component has been drawn in FIG. first package.
• the data structure 100 further comprises a positioning vector Vl of the first component in the set, preferably associated with the identifier 104 of the first component 12, as well as a positioning vector V2 of the second component component in the set, preferably associated with the identifier 106 of the second component 14,
• These vectors are advantageously updated from one or other of the positioning matrices Ml, M2.
• the BOM management software retrieves, in these matrices M1, M2, the positioning information specific to each component, the latter replacing the old positioning vectors V1, V2 if the position of the components has been modified.
• An interest of these vectors is notably to be able to position the geometrical representations of the files FN2 and FN3 so as to obtain a visualization of the whole directly in the nomenclature software.
• the data structure 100 is recorded on a recording medium, for example a CD 18 intended to be read by a computer 20.
• a recording medium for example a CD 18 intended to be read by a computer 20.
• the structure of data 100 can just as easily be stored on the hard disk of the computer 20 or in a server (not shown here) to which the computer 20 is connected.
• FIG. 5 a method of adding in a pre-existing assembly, in this case the assembly 10 shown in FIG. 1, a third component 16, illustrated in FIG. 2C, namely a high-pressure turbine wheel 16. known, is attached to the rotation shaft 12.
• the new set obtained 10 ' is illustrated in Figure 3. It comprises the elements of the pre-existing set, that is to say the first and second components 12,14 as well as the additional component 16.
• a new identifier 102 ' is created in the data structure 100, for this new set 10', and a new identifier 108 is created, if it does not already exist, for the third component 16 to be added .
• the nomenclature links LN1 ', LN2 # and LN3 are created between the new identifier 102' and the identifiers 104, 106, 108 of the first, second and third components 12, 14, 16 to define that these three components belong to the new set.
• the geometric representation of the third component visible in Figure 2C is created, in this example "using the first package, thereby generating this native 2Q8N CAD file. It should be noted that the geometric representation of the third component 16 could is made from another software package without departing from the scope of the present invention.
• a first link S1 between the identifier 108 of the third component and the file is created in the data structure 100.
• a second link S2 is also created between the identifier 108 of the third component 16 and the associated translated CAD file 208T.
• a first data file 11 'associated with the new set 10' is created, written in the first format and containing a new spatial positioning matrix M1 'consisting of the spatial positioning matrix M1 of the first and second components, and a positioning vector of the third component 16 in the new set.
• This matrix M1 ' is created after the designer has spatially positioned, using the first software package, the third component 16 in the new set.
• This first data file El ' also contains pointers PT1, PT2 and PT3 to each of the three CAD files 204N, 206T and 208N, the pointers PT1 and PT2 being preferentially copied from the first data file E1 of the pre-existing set. Then, we create a first link Rl 'between the identifier 102' of the new set and the first data file El 'that has just been created.
• another data file E2 ' is created, also associated with the new set, written in another format, preferably the second format mentioned above so that it can be opened with the second package.
• a spatial positioning matrix M2' is created from the spatial positioning matrix M1 'of the first data file E1'.
• QTl, QT2, QT3 pointers are also created for 204T CAD files,
• the links P1, P2, Q1, Q2 are copied between the identifiers of the first and second components 104, 106 and the CAD files 204N, 204T, 206N, and 206T.
• the positioning vectors of the three components Vl ', V2' and V3 are updated from the new positioning matrix M1 'or M2'.
• the addition method according to the invention constrains the CAD model, that is to say the CAD files and the data files, to be organized as the data structure of the nomenclature. An interest already mentioned is to obtain a CAD structure that is synchronized with the nomenclature.
• FIG. 6 another aspect of the invention will now be described, namely a method of deleting a component, the component to be deleted, in a pre-existing assembly, for example the assembly illustrated in FIG. figure 1.
• the pre-existing set of nomenclature comprises the first and second components 12, 14 and we choose to delete the second component 14 in this pre-existing set.
• the suppression method could, in another example, be implemented to remove one of the three components of the assembly 102 'illustrated in FIG.
• a new identifier 102 is created in the data structure 100 for the new set comprising only the first component 12.
• This new identifier 102 is connected to [identifier 104 of the first component 12 by a LNL "nomenclature link, the nomenclature link to the identifier 106 of the second component 14 being deleted.
• a first data file El is then created in the first format, comprising a spatial positioning matrix Ml" generated from the positioning matrix Mi of the elements of the pre-existing set. To do this, we delete in this matrix Ml the data matrixes relating to the spatial position of the second component 14 in the pre-existing set.
• the pointer PT1 is also copied to the native CAD file 204N containing the geometric representation of the first component in the first format.
• a second data file E2 " is created, in the second native format CAD 2, comprising a spatial positioning matrix M2" generated from the positioning matrix M2 of the elements of the pre-existing set, this spatial positioning matrix M2 ", which can be identical to the matrix Ml" of the first data file El ".
• the QT1 pointer is also copied to the translated CAD file 204T containing the geometric representation of the first component in a format compatible with the second CAD 2 format.
• the links P1 and P2 are then copied between the identifier 104 of the first component 12 and the CAD files 204N and 204T containing the geometric representation of this first component 12.
• the positioning vector Vl "of the first component 12 is updated in the data structure, for example from the positioning matrix Ml" of the first data file M11 "of the new set.
• deletion method according to the invention again allows the CAD model to be advantageously organized as the data structure of the nomenclature.

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• 2009
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