KR20080088685A - System and method for automatic cae analysis based on the web - Google Patents

Abstract

A system and a method for analyzing CAE(Computer Aided Engineering) automatically based on the web are provided to enable any user including a beginner to analyze the CAE easily in a PC based on the web while remarkably reducing expense/time without installing an expensive CAE analysis program. A server(20) processes CAE processing by receiving information from a user PC(10) connected through the Internet and transmits a result value to the user PC. A member information database(30) stores and manages member and system usage information by linking with the server. A conversion information database(40) stores predefined mesh size and boundary condition values of each 3D(Dimensional) CAD(Computer-Aided Design) data property. An analysis information database(50) stores and manages a proper allowance of each analysis type, and a CAE analyzer performs CAE processing by receiving the mesh size and boundary condition value. An output value of the CAE analyzer is transmitted to the user PC when the value calculated by the analyzer is included in the proper allowance.

Description

Web-based CAE analysis method and system {System and Method for automatic CAE analysis based on the web}

1 is a flowchart illustrating a general analysis process of analyzing a flow field using a conventional CAE program.

2 is a conceptual diagram of a web-based automatic flow field analysis system according to the present invention

Figure 3 is a flow chart schematically illustrating a process of the automatic flow noise analysis method according to a preferred embodiment of the present invention.

FIG. 4 is an exemplary diagram for explaining a process of assigning a fast image value to a three-dimensional three-dimensional grid created by a CAD program.

5 is a conceptual diagram conceptually illustrating a process of loading (loading) the CAD data and combining the CAD data with a tester of a CAE program.

6 is a view showing a state in which the grid generation is completed in the shape of the fan 3D modeled by the method according to the present invention.

7 is a pressure distribution chart for each part of the three-dimensional modeling shape calculated based on the flow pressure calculated by the CAE program.

The present invention provides a complicated menu function provided by a CAE program by automatically mapping lattice values and boundary condition values corresponding to the property values of each grid when the three-dimensional solid shape data created by the CAD program is imported from the CAE program. The present invention relates to a web-based CAE automatic analysis method and system for automatically providing CAE analysis without a user's manipulation input.

In general, Computer Aided Engineering (CAE) is a computer simulation of a prototype model that is rough in all engineering fields. It can be called an analysis method that designs the optimal design until it is satisfied by repeatedly performing the method.

The CAE analysis method widely used in most engineering is the 'finite-element method'.

In the CAE analysis method, a structure (or solid shape) is composed of a model consisting of a set of elements divided into internally connected chunks. After performing the analysis of each element, the analysis results (output results) can be viewed automatically according to the computational results of the computer.

In the CAE analysis methodology, the process of constructing a model of finite elements is often called preprocessing, and the process of displaying the analysis results as a picture or graph is called post-processing.

The present invention relates to the process of constructing a model of finite element. The CAE analysis is performed to solve problems in various areas such as stress consideration, deformation, heat exchange, magnetic field distribution, fluid flow, and flow noise. Although used, the detailed description of the present invention will be described taking the process of analyzing the flow field as an example.

To analyze the flow field and the flow noise, as described above, the object is modeled in a three-dimensional shape using a CAD program, imported into the CAE analysis program, and then provided in the CAE analysis program. According to the menu, each mesh of the modeled shape is manually inputted by specifying the size of the grid. Then, a boundary condition (for example, flow velocity, pressure, constraint, etc.) is manually input to each of the grids of which size is set manually.

As the next step after the input of the condition value, the flow pressure is calculated by executing the computer aided engineering (CAE) analysis program. The process up to this point is generally referred to as "flow analysis" or "flow analysis" for short.

The flow analysis process that is generally performed in the prior art is briefly shown in FIG.

In the case of the simulation analysis which is performed in this way, it is very cumbersome to set the size of each mesh of the model shape and to set the boundary condition of each grid while executing the CAE analysis program. There is a limitation in use because professional knowledge is required.

In addition, since this interpretation is impossible without the CAE program, it is difficult for small and medium-sized businesses to have the economic burden of purchasing the CAE program at a high cost.

The present invention is to improve the above problems, without having to install expensive CAE analysis program on the user PC, web-based CAE that can be easily used by anyone, including beginners on the web, while dramatically reducing the cost and time An object of the present invention is to provide an automatic analysis method and a system thereof.

Further objects and advantages of the present invention will be described in detail below, and will be fully understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the components described in the claims and combinations thereof.

In order to achieve the above object, the web-based CAE automatic analysis method according to the present invention,

The user installs the CAE analysis program in the PC and escapes the conventional method of directly inputting the grid condition value and boundary condition value provided by the CAE analysis program.

After modeling the 3D data to which the attribute value is given according to a predetermined rule for each grid of the 3D shape data by the CAD program on the user PC 10, the server of the CAE automatic analysis system according to the present invention via the Internet (20) ) And the CAE program execution command mounted on the server 20 is transmitted to the server 20 after uploading the 3D modeling data, the server 20 recognizing the execution command is uploaded 3. Based on the grid property values of the dimensional modeling data, CAE is automatically mapped from the transformation information DB 40 to the mesh size corresponding to the property and the boundary condition. The program is executed, and the result value is transmitted to the user side PC 10 so as to be displayed on the user PC.

In addition, the web-based CAE automatic analysis system according to the present invention for implementing such an analysis method,

A user PC 10; A web-based system comprising a server 20 connected to the user PC 10 by a communication network to receive information at the request of the user PC, perform a predetermined processor, and transmit the result value to the user PC. In the system, the member information DB 30 is interlocked with the server 20 and stores and manages member information and system usage information; A transformation information DB 40 in which a grid size value and a boundary condition value are defined for each property value of the 3D CAD data; A CAE analysis unit which receives the grid size value and the boundary condition value and performs CAE processing; Characterized in that the transmission unit for transmitting the result value analyzed by the CAE analysis unit to the user PC (10).

Here, the property value is a well-known menu provided in a 3D CAD program, and a layer name or color (a layer name) or color (a color) assigned to each mesh during a 3D shape modeling process in the 3D CAD program is provided. color).

Web-based CAE automatic analysis method and system according to the present invention, if the user PC 10 is provided with only a CAD environment and a communication environment that can be connected to the Internet, without a separate CFD program and difficult and time-consuming grid size It is possible to obtain a fast and accurate result value by connecting to the CAE automatic analysis system according to the present invention without setting the value and setting the boundary condition value.

Hereinafter, in order to describe the web-based CAE automatic analysis system according to the present invention in more detail, a CAE analysis system for analyzing a flow field will be described in detail.

Figure 2 shows a conceptual diagram of a CAE analysis system for analyzing the flow field on the web-based, Figure 3a is a schematic flowchart of a web-based CAE automatic analysis method according to the present invention,

First, access to the web is a member authentication step. Since the member authentication step can be sufficiently implemented in a known method, a detailed description thereof will be omitted. However, as a form of business for providing a service of the system according to the present invention, the service according to the present invention is limited to members, but in the case of charging a fee based on the number of times of use of the system, the system is used in addition to the personal information of the member. Information (number of times, number of times of access, etc.) will be managed by being included in the member information DB.

As a next step, the server 20 goes through a data input step of receiving 3D modeling data given an attribute value according to a rule defined for each grid of 3D shape data from the user PC 10. The data input step includes a processor for storing the received 3D modeling data, in order to provide the member with the history information and the result value analyzed by the member using the automatic analysis system according to the present invention. This is because it is necessary to store and manage the received 3D modeling data.

As a next step, the CAE program mounted on the server 20 is executed, and the CAD data received by the data input step is opened (readed) in the CAE program, and the grids are provided for each property value. An automatic setting step of automatically reading the grid size value and the boundary condition value from the conversion information DB in which the size value and the boundary condition value are stored, and automatically setting the grid size value and the boundary condition value; A result calculating step of calculating a result value (flow pressure change value in the case of the embodiments shown in Figs. 2 and 3) by executing the CAE program; Each grid of the 3D shape model is composed of a result transmission step of transmitting the color corresponding to the result value to the model to the user PC (10).

More preferably, an appropriate allowable value for each application field (or analysis type) of CAE analysis to be performed may be stored and managed in the analysis information DB 50, and the result value by the result calculation step may be stored in the user PC. On the other hand, it is configured to provide useful information to a novice user (experimental) who does not have a high level of expertise by comparing and determining whether the result value falls within an appropriate allowable range and transmitting the result to the user PC. Since the analysis information DB 50 can be built in advance by the expert's verification, not only can an objective and accurate judgment be presented to users as to whether the result is appropriate, but also an inadequate cause of the result can be provided. It may also be implemented. Figure 3b shows a schematic flowchart of a web-based CAE automatic analysis method comprising the step of providing information to determine whether such a proper design.

As the property value, any one of a layer name or color assigned to each mesh in a 3D CAD modeling process in a 3D CAD program, or a combination of the two property values It can be used more effectively.

That is, for example, in order to predict in advance the noise that a new shape fan or propeller will cause, the shape of the analysis object is modeled as a three-dimensional shape by a CAD program. It assigns a specific color (according to predefined rules) for each specific part. In drawing a three-dimensional solid shape in a CAD program, assigning a color or layer name to a grid is very easy and simple, at least for the CAD program user, and is a general task. FIG. 4 is an exemplary view for explaining a state in which attribute values are assigned to a three-dimensional three-dimensional grid created by a CAD program.

In the present invention, the information (lattice size value, boundary condition value) required by the CAE program for each specific layer name or color is previously databased and stored in the conversion information DB, as shown in FIG. After loading (opening and blowing) the CAD data and combining it with a tester of the CAE program, it is necessary for the CAE analysis program from the conversion information DB based on the information corresponding to the layer name or color stored in the CAD data. It is characterized in that it is configured to automatically generate by reading the size value of the mesh and various boundary condition values (flow velocity, pressure, constraint conditions, etc.).

Through this process, the size of the mesh required by the CFD analysis program is automatically generated based on the shape information and attribute values of the CAD data, and the purpose of the analysis (structural analysis, stress analysis, Since various boundary condition values (external force, self-weight, temperature, flow rate, pressure, restraint conditions, etc.) determined according to the characteristics of the product and thermal analysis, fluid analysis, etc.) are automatically generated, The menus and commands eliminate the need to enter size values for each grid and input various boundary condition values. Therefore, even beginners who do not have a high level of expertise on the size and boundary conditions for each grid can easily and quickly prepare for CAE analysis.

In the case of the flow analysis as an example, in the process of modeling the analysis object into a three-dimensional shape by a CAD program, a certain color and a certain layer name for each wing part (end, front, rear, center, etc.) For each boundary condition regarding pressure, distance, constraints, etc., a predefined protocol must of course be presented to the operator, and the grid size corresponding to the layer name and color, and Boundary condition values should be provided in a database.

Of course, the above rules required for the three-dimensional shape modeling by the CAD program will naturally be included in the instruction manual of the analysis method execution program according to the present invention.

5 is a view showing a state in which the grid generation is completed in the shape of the fan 3D modeled by the method according to the present invention.

6 is a diagram illustrating a state in which the grid generation is completed in the shape of the fan 3D modeled by the method according to the present invention.

When the preparation for the CAE analysis execution (the grid size value generation and the automatic setting of the boundary condition value) is completed by the above process, the result value is calculated by the CAE analysis program which performs CAE processing. Since the result calculation step is a process performed by a known CAE analysis program, a detailed description thereof will be omitted.

FIG. 7 is a pressure distribution chart for each part of the three-dimensional modeling shape calculated based on the result value calculated by the CAE program (shown as a result of the flow pressure analysis example), and FIG. Fig. 7 (b) shows the result of high pressure being distributed on the wing surface adjacent to the tip of the wing. Figure 7 (c) is a graphical representation of the result of the distribution of high pressure on the tip of the wing (Tip), Figure 7 (d) is the front edge (Toe Edge) of the wing (wing) and the number of axes The result of the distribution of high pressure at the boundary of is represented graphically.

If a more accurate analysis result is required for a specific part of the wing, the above steps are performed again by lowering the mesh size. For this, the user can set the attribute values (layers) of the grid of the CAD program modeling. After changing the name or color), it is possible to reinterpret simply by repeating the process again.

As a final step, the present invention passes the result transfer step of transmitting the result value (eg, stress distribution, pressure distribution, flow pressure distribution, etc.) graph or distribution chart for each part of the 3D shape model to be analyzed to the user PC. do.

As shown in FIG. 3B, in the case of the embodiment further comprising the step of automatically comparing the appropriateness of the analysis result value and transmitting the comparison result to the user PC, the CAE analysis field (or analysis) currently performed. By reading the information from the analysis information DB (50) in which appropriate allowance values are stored and managed for each type) and comparing the result value with the result calculated by the result calculation step, it is determined whether the result value falls within an appropriate allowable range to the user PC. By transmitting, it is possible to provide useful information to a novice user (experimental) who does not have a high level of expertise.

Although the present invention has been described with reference to a method of interpreting the flow noise as a preferred embodiment, this is merely exemplary, and those skilled in the art to which the art belongs, various modifications and equivalents therefrom It will be appreciated that other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

The web-based CAE automatic analysis method and the system configured as described above do not need to learn and understand the complicated and professional menus provided by the CAE analysis program, and do not depend on the designer's experience, and the experimenter can three-dimensional shape By specifying predefined attribute values in the modeling process of the system, not only the grid size generation and boundary condition (interpretation condition) are automatically made, but also the repeated analysis result history information is provided from the server. It can provide convenience to receive.

Furthermore, the web-based CAE analysis method according to the present invention does not need to purchase expensive CAE analysis program because the CAE analysis program is executed in the server 20, and the user PC 10 has a low performance specification. Even in the case of, there is an advantage that the analysis result can be provided quickly within a short time.

Claims (3)

In the web-based CAE automatic analysis method for executing the CAE program by the server 20 received the information necessary for CAE analysis from the remote user PC 10 by the communication means, and transmits the result value back to the user PC. In A member authentication step of determining whether the user is a normal user by checking the ID and password transmitted to the server 20 in the member information DB 30; A data input step of receiving, from the user PC, 3D modeling data to which the attribute value is assigned according to a rule defined for each grid of 3D shape data to the server 20; The CAE program mounted on the server 20 is executed by the execution command of the user PC 10, and the CAD data received by the input step is read from the CAE program, and the respective property values An automatic setting step of automatically reading the grid size value and the boundary condition value from the conversion information DB in which the grid size value and the boundary condition value are stored for each time, and automatically setting the grid size value and the boundary condition value; A result value calculating step of calculating a result value by executing the CAE program; Web-based CAE automatic analysis method comprising the result of the step of transmitting the color corresponding to the result value to the model for each grid of the 3D shape model to the user PC (10). According to the first, Web-based CAE automatic analysis method, characterized in that the attribute value assigned to each grid of the 3D shape data is layer name and color information. A user PC 10; The server 20 connected to the user PC 10 by a communication network to receive information at the request of the user PC, perform a predetermined computer aided engineering (CAE) processor, and transmit the result value to the user PC. In the web-based CAE automatic analysis system composed of A member information DB 30 interlocked with the server 20 and storing and managing member information and system usage information; A transformation information DB 40 in which a grid size value and a boundary condition value are defined for each property value of the 3D CAD data; An analysis information DB 50 in which an appropriate allowance value is stored and managed for each analysis type; A CAE analysis unit which receives the grid size value and the boundary condition value and performs CAE processing; A comparison step of comparing whether or not the result value calculated by the analysis unit falls within an appropriate allowable value range; Web-based CAE automatic analysis system comprising a result transmission step of transmitting the output value by the CFD analysis unit to the user PC (10).

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