RU2325691C1 - Method of automatic construction of three-dimensional geometric model of item in geometric modelling system - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: stated result is achieved because construction of three-dimensional geometric model of item (TGM) is done with application of basic models. Item geometry data is identified, selected data is transformed in values of geometric parameters of item TGM elements, one or several basic models are selected to be changed in accordance with item geometry data, sequence of TGM automatic construction operations on the basis of basic models is preset, afterwards basic models are extracted from the preliminarily created database, values of their parameters are changed in accordance with item geometry data or by previously determined method.

EFFECT: reduces time and computing resources.

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Description

The invention relates to the field of information technology and can be used in the design of complex technical products on a computer. The implementation of the invention can dramatically reduce the time and computing resources spent on the design of such products.

A known method of constructing a three-dimensional geometric model (TGM) of a product used in a graphical browser system for displaying and managing a computer model, also called a geometric modeling system (US patent No. 5815154 "Graphic browser system for displaying and managing a computer model" of September 29, 1998) , which provides the user with the opportunity to build a product model on the computer screen and control this model using keyboard commands, mouse / cursor combinations, and other environments input options. Changes in the model are displayed on the screen image of the model at the moment when the user makes changes or in response to the actions of the user who sends a special command to update the screen image of the model. In this method, a separate representation of a computer model is used in the form of a graphic image of a three-dimensional model in one part of the screen and the pictograms of its constituent elements in another part of the screen, which are displayed in a certain order associated with the order of creation of model elements and the interconnections of the elements with each other. At the same time, the user can access all the characteristics of the model using both a graphical representation and pictograms of structural elements.

This method, with all its advantages, has significant drawbacks when it is used in the design process on a computer, when there are previously created one or more three-dimensional geometric computer models of products that can be used to construct TGM products. In this case, the user must each time manually build computer models of the elements of the product and the product itself, performing many typical operations during the construction process, which repeat the operations performed by the user earlier in the construction of other three-dimensional geometric models.

Therefore, the objective of the invention is to eliminate the above disadvantages, namely: accelerating and increasing the speed of the process of constructing TGM elements of products and the products themselves in the design process by applying a given sequence of operations to one or more existing basic models, which are previously created TGM products.

The solution to this problem is achieved by the fact that in the method of automatically building the TGM of the product in a geometric modeling system that provides the user with the opportunity to build the product model on the monitor screen and control this model using keyboard commands, mouse / cursor combinations and other input means, with changes in the model displayed on the screen image of the model at the moment when the user makes changes or in response to the action of the user who sends a special command to update a screen image, according to the invention, the construction of the product model is carried out using means for specifying, selecting and executing a sequence of operations for automatically building the TGM of the product on the basis of one or more basic models representing previously created TGM of the product, first determining the geometry data of the product to be used when building the TGM of the product using the data selection tool, then reading this data using the automatic numeric reading tool data, then the selected data is converted to the geometric parameters of the TGM elements of the product using the means of automatic conversion of numerical data, one or more basic models are determined that will be changed in accordance with the product geometry data, the basic models are selected using the basic model selection tool, building TGM products on the basis of basic models using the means of setting the sequence of operations of building TGM, after which vlyayut extraction basic models of pre-created database by using the basic models of the interaction means with said database, changing the values of parameters or data in accordance with the geometry of the product, or in a predetermined manner by the means for automatically constructing TGM product.

The essence of the proposed method lies in the fact that for the automatic construction of TGM products are used previously created TGM products (base models). For this, the sequence of necessary operations is specified, and then the TGM of the elements of the base models and the TGM of the base models are automatically changed in accordance with the data on the geometry of the product. At the same time, there is no need to build the TGM of the product anew, which in this case is built by changing the geometric parameters of the basic models. This allows you to dramatically speed up the construction of TGM products based on basic models and reduce the cost of building TGM products, if there are basic models that can be used to build a model of the product.

The drawing shows a diagram of the functioning and interaction of the tools included in the method of automatically building TGM products based on basic models in a geometric modeling system. The described tools are programs, therefore they are also called software modules. The following notation is used in the above diagram:

1 - means for selecting product geometry data (SVDG);

2 - means of automatic reading of numerical data containing the values of the geometric parameters of the product (SASHD);

3 - means for automatically converting numerical data into values of geometric parameters of TGM elements (SAPD);

4 - a means of choosing the basic models that will be used in the construction of the TGM products (SBM);

5 - a means of setting the sequence of operations for constructing a TGM product based on one or more basic models (SZPO);

6 - a means of interacting with a database (hereinafter DB) of base models (BDS);

7 - database of basic models (DB);

8 - a means of automatically building TGM products based on basic models (SAPM);

9 - a system of geometric modeling (SGM).

The basic model refers to the previously built three-dimensional geometric model of a certain product, which can be used to build a TGM of the designed product (for example, to build a TGM engine, you can use previously constructed TGM of other engines).

A user’s means of selecting product geometry data that will be used to construct a TGM (SVDG) means a software module (program) that allows the user to interactively select product geometry data and their location (a file on the hard disk of a personal computer, a local computer network, or network database).

Under the means of automatic reading of numerical data containing the values of the geometric parameters of the product (SASHD), we mean a software module (program) that automatically reads the data of the geometry of the product.

By means of the automatic conversion of numerical data into the values of the geometric parameters of the TGM elements of an article (SAPD) is meant a software module (program) that converts numerical data into the values of the geometric parameters of the TGM design.

Under the basic model selection tool (SBM) is meant a software module (program) that allows you to specify one or more basic models that will be used to build the TGM product.

By means of setting a sequence of operations for constructing a TGM product based on a TGM prototype (SZPO) is meant a software module (program) that allows you to specify a sequence of operations for automatically building a TGM product based on one or more basic models.

A means of constructing a TGM of a product based on one or several basic models (SAPM) is understood to mean a software module (program) that allows you to build a TGM of a product based on a change in the geometric parameters of the basic models or in exact accordance with the parameter value, if it is available in the geometric data on the product, or in a certain way, for example, a proportional change if information about this parameter is not available in the geometric data on the product.

A database of basic models refers to a previously created database in which basic models are stored.

Under the means of interaction with the database of basic models (SBBD) is meant a software module (program) that converts requests for copying basic models to the database format.

The automatic construction of a TGM product based on basic models is carried out as follows: first, the user, using SVDG, item 1, selects which geometric data will be used to build a TGM product based on basic models. Further, using SASHD, item 2, an automatic reading of numerical data containing information about the geometric parameters of the product is carried out. Using the data obtained using the SASHD, the values of the geometric parameters of the product are determined, which will be used in the process of constructing the TGM of the product when changing the basic models, using the SAPD, item 3.

Next, one or several basic models are determined that will be used to construct the TGM of the product using SVM, pos. 4 (for example, when constructing the TGM of the engine, you can use both the previously developed engine model and take the model of the engine chamber from one previously developed product, and the nozzle block model is from another, to then determine the connection operations of these two basic models in the product model).

At the next step, the sequence of operations for constructing the TGM of the product based on the previously selected one or more basic models, SZPO, item 5 is determined.

Further, in accordance with the previously set sequence of operations for constructing a TGM product, the TGM product is automatically built based on basic models using SAPM, item 8. At the same time, the elements of the basic models and the basic models themselves are copied from the database of the basic models through the interaction between the BDS, pos.6, and the database, pos.7, while the values of their geometric parameters are changed either in accordance with the values obtained by the SAPD, pos.3, or in a predefined way, such as proportional change, using SAPM. All program modules included in the implementation of the method of automatically building TGM products in a geometric modeling system based on basic models either work in the SGM, item 9, or interact closely with it, which is shown in the diagram by a dotted block that covers the described program modules.

The method of automatically building a TGM product in a geometric modeling system based on basic models is programmatically implemented and used in the design of complex technical products using the example of aircraft components: a glider, an engine, a gyrocoordinator. The practical application of this method allows to reduce the execution time of a preliminary design of these products, which confirms its effectiveness.

Claims (1)

A method for automatically constructing a three-dimensional geometric model (TGM) of a product in a geometric modeling system, including creating a product on a TGM monitor screen by a user and controlling this three-dimensional geometric model using keyboard commands, a mouse, or other input means, with changes in the TGM being displayed on the screen image of the TGM at the moment when the user makes changes or in response to the action of the user sending a command to update the screen image, different t m, that the construction of the TGM of the product is carried out using the means of specifying, selecting and executing a sequence of operations for automatically building the TGM of the product on the basis of one or more basic TGMs that are previously created TGM of products, while first determining the geometry data of the product that will be used when building the TGM products using the data selector, then read these data using the automatic reading of numerical data, then carry out the selection conversion data into the values of the geometric parameters of the TGM elements of the product using the means of automatic conversion of numerical data, determine one or more basic TGMs that will be changed in accordance with the data of the geometry of the product, using the means of selecting the basic TGMs, set the sequence of operations for automatically building the TGM of the product based on basic models using the means of setting the sequence of operations to build a TGM, and then carry out the extraction of basic models from previously created Anna basic models database using means interacting with said database, changing the values of parameters or data in accordance with the geometry of the product, or in a predetermined manner by the means for automatically constructing TGM product.