RU2413305C2 - Method for automatic construction of three-dimensional geometrical models of radio articles in geometrical modelling system - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: three-dimensional geometrical models of radio articles are constructed in a geometrical modelling system without need for creating additional databases. Said models are constructed by simplifying their mathematical models, thus making them appropriate for making calculations. Available data are used in printed circuit board layout, editing models and data base of the system for automatic design of printed circuit boards, from which a three-dimensional geometrical model is constructed using one-dimensional finite elements.

EFFECT: cutting on time and computational resources on designing electrical articles.

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Description

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

A known method for automatically building a three-dimensional geometric model (TGM) of a product in a geometric modeling system (RU 2308763 C2), taken as a prototype, which allows the user to build a product model on the monitor screen and control this model using keyboard commands, mouse / cursor combinations and other input tools. In this case, 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 action of the user who sends a special command to update the screen image. This method allows the automatic construction of TGM products using previously created TGM products (basic 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.

This method, with all its advantages, has significant disadvantages:

- when it is used in the design process on a computer, TGM products are automatically built using the previously created TGM products (basic models), which makes it necessary to create an additional database (DB) of basic models, and when switching to a non-standard product design, it becomes necessary to replenish the database and track its relevance during operation;

- when using it, the TGMs are automatically built to support structural elements, such as cabinets, blocks, frames, etc. As for electric radio products (ERI), the use of this method will automatically build them correct from the point of view of geometry, but this approach is not suitable for calculations because of the mathematical complexity of the obtained models.

The objective of the proposed method for automatic construction of TGM ERI in a system of geometric modeling (SGM) is to eliminate the above disadvantages, namely

- creation of TGM ERI in the SGM in a way that does not require the presence of additional databases;

- creation of TGM ERI in the SGM by simplifying their mathematical models, thereby making them adequate for calculations.

According to the invention, the construction of TGM ERI in the SGM is carried out using means of specifying, selecting and performing a certain sequence of operations based on the initial data coming from the computer-aided design system of printed circuit boards CAD software. The volume of initial data for the construction is formed on the basis of the file of the printed circuit board topology (CCI), which determines the amount of EMI on the board. Each ERI contains links to information about its properties and attributes, located in the model editor (RM) and CAD software database. Then, this information is automatically read from these links and the numerical data is extracted using automatic reading / highlighting of numerical data (RDS). Then, based on the read / selected numerical data, a structured series of numerical values is automatically created - the data format (PD). In the case when the CAD software does not provide a complete description of the ERI, the PD can be corrected / supplemented by missing information at the discretion of the user (correction / addition based on averaged parameters can be carried out automatically). The numerical values of the created PD are automatically read and converted, using the data conversion system (SPD), into a format accessible by the SGM. After that, the SGM automatically builds the TGM ERI.

The essence of the proposed method lies in the fact that for the automatic construction of the TGM ERI in the SGM, the CCI files and the data contained in the CAD software are used. For this, a sequence of necessary operations is specified. The method involves the creation of TGM ERI in the SGM based on one-dimensional finite elements and the absence of the need to create additional databases. At the same time, the goal is not to precisely match the created models with the real ones, but to build a simplified TGM ERI, the mathematical representation of which is adequate for analysis (calculation), which can drastically reduce the time and computational resources spent on building models of electronic equipment (REA). The above is illustrated by drawings, where (Fig. 1) a diagram of the functioning and interaction of the means by which the automatic construction of the TGM ERI in the SGM is carried out; (Figure 2) shows the sequence of formation of TGM ERI. The means described (FIG. 1) are programs, therefore they are also called program modules. The following notation is used in the above diagram:

1 - a computer-aided design system for printed circuit boards (CAD software);

2 - database system for computer-aided design of printed circuit boards (CAD CAD software);

3 - model editor (RM);

4 - printed circuit board topology (CCI);

5 - data sampling system (SVD);

6 - a system for reading / highlighting numerical data (RDS);

7 - data format (FD);

8 - data conversion system (SPD);

9 - a system of geometric modeling (SGM).

Under the system of computer-aided design of printed circuit boards refers to a software module (program), which creates design documentation (CD) in the development of CCI.

The database of the computer-aided design system of printed circuit boards is understood as the database of the ERI used to create the design documentation for the design of the CCI, which contains detailed information about each ERI.

The model editor is understood as the CAD CAD application, which allows you to create ERI models for the formation of CCI based on the geometric dimensions of the ERI, as well as replenish the CAD CAD software databases with the created models.

Under the topology of the printed circuit board refers to a file containing information for the manufacture of the printed circuit board, including the types of ERE used and their location.

A data sampling system is understood to mean a complex of software modules (programs), which acts as an intermediary between CAD software, CCI and SGM, which reads, generates, converts, and transmits data on ERE.

A system for reading / extracting numerical data is understood to mean a program module (program) that extracts numerical data on EER contained in the CCI, CAD CAD database, and the RM and structures them into categories of values.

Data format refers to a file that in a structured form contains data about ERI.

A data conversion system is understood to mean a software module (program) that converts data from the PD into machine code for the SGM.

Under the system of geometric modeling is meant a software module (program) designed to create, export / import geometric models of the objects under study and conduct various types of analyzes (calculations) on them.

The automatic construction of TGM ERI in the SGM is as follows. First, the user selects the previously created CCI file, pos. 4, developed in CAD software, item 1, using RM, item 3, and CAD software database, item 2. File CCI, DB CAD CAD software, RM contain a detailed description of the parameters of each ERI:

- the CCI file contains information about the architecture of the created printed circuit board (the number and name of the ERI and their location);

- CAD CAD software database contains personal information about the properties (main point of element location, rotation angle, name, number and size of contact pads) and attributes (height, weight, molding, installation and method of fastening the element) of each ERI;

- RM contains a geometric description of each ERI relative to the main point of the element.

Next, using the SHD, pos. 6, there is an extraction of data on the ERA from the CCI, the CAD CAD database of the software and the RM, on the basis of which the PD is formed, pos. 7, containing the extracted data in a structured manner. Further using SPD, pos. 8, data is read from the PD and converted into machine code, which is sent to the SGM, pos. 9, where, based on this code, a simplified three-dimensional geometric model of each ERI is automatically constructed. The model is a structure consisting of rod / beam elements (the number of elements is equal to the number of leads, the thickness of the rod / beam elements is selected averaged over the thickness of the leads of all ERI), originating from the coordinates of the contact pads on the PC, reduced to one point - the top of the geometric center, located at a height equal to the height of the ERI (Figure 2). The resulting design is assigned the mass of ERI. If necessary, the design can assign various characteristics involved in the analysis (calculation), as well as reflect the method of attachment by moving the top of the geometric center or rigidly fix it with another rod / beam element, lowered from the top onto the PP plane, thereby simulating the ERI fastening. If information about ERI is not enough for the automatic construction of TGM ERI, then it is allowed to use averaged data for the entire structure. If there are critical elements in the design that require special attention and accurate modeling, it is allowed to describe them yourself using the inputs - control of the TGM ERI. Created by TGM ERI in the SGM can participate in various types of analyzes (calculations) independently and as part of the mathematical model of the entire REA.

The process of building a TGM ERI in a SGM can be controlled in the following ways:

- by changing the CCI file or personal information about each ERI in the CAD software database and RM (changing the ERM TGM in the SGM and displaying it on the screen when the system is restarted);

- adjustment of the PD (changing the TGM ERI in the SGM and displaying it on the screen at the time the change was made or at the time of issuing a special command to update the screen image);

- adjustment of the TGM ERI in the SGM (change of the TGM ERI in the SGM and its display on the screen at the time of the change or at the time of issuing a special command to update the screen image).

The method for automatically constructing the TGM ERI in the SGM was programmatically worked out and debugged during the design of the onboard REA of spacecraft, as well as during the mechanical analysis of its geometric models. The practical application of this method can drastically reduce the time and computational resources spent on the design of electronic equipment, which confirms the effectiveness of the method of automatically building a TGM ERI in a SGM.

Claims (1)

A method for automatically constructing three-dimensional geometric models of electro-radio products in a geometric modeling system, including constructing and managing three-dimensional geometric models by a user on a monitor screen using keyboard commands and combinations of mouse / cursor commands, in which three-dimensional geometric models are constructed using set, select, and execute tools the sequence of operations of automatic construction of three-dimensional geometric models of electro-radiois divisions based on the data contained in the database of the system for automatically constructing printed circuit boards of used electronic products in the topology of printed circuit boards, then they automatically read the selected data using a data read / highlight system and convert them using a data conversion system, select the previously created printed circuit topology, Based on the data contained in the selected circuit board topology, data is read from the model editor and the database of the automatic design system printed circuit boards, numerical data is extracted from them using a data reading / extraction system, based on the extracted data, a data format is created that contains them in a structured form of numerical values, after which, using data conversion systems, the selected and structured data are converted to machine data a code on the basis of which three-dimensional geometric models of electronic radio products are built in a geometric modeling system.

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