KR101291257B1 - System and method for evaluating correlation of production with welding distortion - Google Patents

Abstract

Disclosed are a production impact assessment system and method of welding deformation.
The production impact evaluation system of the weld deformation of the present invention is a shape definition module, geometric definition processing module, mesh generation module, boundary condition mapping module, boundary condition calculation module, weld deformation analysis module, post-processing module It may include.

Description

Production impact assessment system and method of welding deformation {SYSTEM AND METHOD FOR EVALUATING CORRELATION OF PRODUCTION WITH WELDING DISTORTION}

The present invention relates to a system and method for evaluating the production impact of weld deformation, which can analyze the predicted amount of weld deformation and determine how much it affects the production operation and how severe the impact is in terms of quality cost. .

In general, the assembly process of ship production can consist mostly of welding operations.

Welding deformation generated during welding operation can be largely represented by plastic deformation such as in-plane shrinkage and bending or distortion.

If such plastic deformation does not create a welding working environment that can stably manufacture various welding products used for ship construction, such as unit panels to be assembled, internal parts of welding products, blocks, etc., the joining between two welding products 접합 Physical force must be applied to re-cut the protruding part of the face or to eliminate excessive weld gaps or misalignments between the welded products, which are caused by distances between the welds.

This additional rework time not only increases the time required for the assembly and assembly process, but also makes it difficult to apply various automatic welding robots or advanced production equipment, resulting in a weakening of the shipbuilding industry's production competitiveness.

In addition, in order to prevent inevitably occurring welding deformation in the design stage, it is also necessary to prevent the increase in the thickness of the site vulnerable to deformation or to design additional reinforcement.

In the field of producing and managing welding-related products, there is a production risk due to welding deformation.

Since the production risk caused by welding deformation affects the production of welding deformation, a producer who produces high quality welding products requires a means for quantitatively or standardly evaluating and managing the production impact of welding deformation. It is becoming.

As a background art of the invention, as shown in Figure 1, there is an automatic generation system for the welding deformation analysis of the ship structure.

The prior art system 10 includes a file generator 11, a finite element model generator 12, a weld deformation analysis solver 13, and a report generator 14.

The file generator 11 outputs CAD information of hulls worked in the design department in a neutral format so as to be readable in various applications in order to perform weld deformation analysis. And attribute information are output in a separate text file.

In addition, the finite element model generator 12 implements the external shape of the hull from the CAD information in the neutral format output from the file generator, reads the internal material information from the text file and restores the external shape of the hull to the CAD shape by Automatically generate finite element models. For example, the load boundary condition for simple elastic analysis or the material constant for simple thermal analysis are automatically generated in consideration of the thickness of the base material and the weld shape around the weld line. At this time, in order to improve the accuracy of the welding deformation analysis, the periphery of the weld line is automatically generated to the finite element size indicated by the user to have a dense density, and the finite element is automatically generated so that the finite elements are completely connected.

The weld deformation analysis solver 13 receives the information about the finite element model generated from the finite element model generator 12 and performs the weld deformation analysis.

The report generator 14 receives the weld deformation analysis result from the weld deformation analysis solver 13, generates a result report, and automatically stores the result in a location designated by the user.

However, the prior art system 100 provides the configuration of computer hardware and software for automatically performing the analysis of welding deformation of the ship structure to analyze the welding deformation and output the result, and the production impact of the welding deformation. In the initial design concept or conceptual design stage in which the object to be evaluated is not modeled, that is, the CAD information of the hull is not prepared, there is a disadvantage in that the production impact of the welding deformation cannot be evaluated.

In other words, the production influence of welding deformation is to predict and prevent the production risk due to welding deformation that may occur during the manufacture of a welded product requiring welding work in advance. It can mean the result of analysis that can predict the amount of deformation to be made, and how easily the prediction affects the production work of the welded product.

However, the prior art system provides only a file generator that outputs the CAD information of the hull worked in the design department in a neutral format to be read by various applications in order to perform the welding deformation analysis, thereby improving the production impact of the welding deformation. In the initial design or conceptual design phase, where the object to be evaluated is not modeled, the design process is dependent on the inefficient task of defining the passive product and storing it as shape information. I have a problem that takes this.

In addition, the prior art system does not have a boundary condition database (DB) that systematically manages boundary conditions, and when the weld to be evaluated has a unique structure that simply does not automatically assign a load boundary condition from the shape, After manually modeling work separately, and by performing a heat transfer analysis manually to calculate the boundary conditions, there are also disadvantages that a large number of inefficient tasks exist.

In addition, since the prior art system generates a finite element with a finite element size instructed by a user, deviation may occur in the analysis result according to a user's arbitrarily instructed content, thereby generating a standardized or quantified finite element and It can be difficult to expect standardized work on mapping results.

In addition, the system of the prior art has an inefficiency that the analysis time is increased when the user indicates the finite element size too densely, and the precision is inferior when the finite element size is not too tightly indicated.

In addition, since the prior art system has only a report generator that receives the welding deformation analysis result from the welding deformation analysis solver and simply outputs the analysis result report, how the analysis result affects the production work of the corresponding welding product, It has the disadvantage that the user can see the report arbitrarily about the specific impact of production such as how much the quality cost is incurred, whether the tolerance per process is within the allowable range, and whether it satisfies the quality satisfaction.

As a result, the prior art system was able to analyze the weld deformation and output some analysis results in the form of reports, where the welding deformation had some influence on the production of the welded products, and the production impact of the weld deformation was high. Since there is no means for determining how severe it is in terms of cost, it is difficult to judge the state of exclusion of subjectivity by standardizing the impact of welding deformation.

Patent Document 1: Registered Patent Publication No. 10-0919468

In an embodiment of the present invention, a parametric modeling unit or a parametric welder modeling unit may be provided to handle analytical processes more conveniently and standardized. It is intended to provide a system and method for evaluating the production impact of weld deformation that can affect and easily handle the evaluation of how severe the impact of the production of weld deformation is in terms of quality cost.

According to an aspect of the present invention, a shape definition module for performing a geometric definition of the analysis target model, a geometry definition processing module for defining the properties of the analysis target model to store as geometry information, member property information, weld line information and And a mesh generation module for generating meshes using the geometric information, member property information, and weld line information, and generating mesh processing values including input variables for calculating load conditions, and matching the input variables for calculating load conditions. Boundary condition mapping module for generating finite element model by finding boundary condition or processing boundary condition calculation request, and boundary for calculating weld deformation analysis boundary condition according to the boundary condition calculation request and passing it to the boundary condition mapping module A condition analysis module, a weld deformation analysis module for performing weld deformation analysis using the finite element model, and the weld deformation The production impact evaluation system of a weld deformation including a post-processing module for processing the deformation analysis results of the analysis module and outputting the data as a data for evaluating the production impact of the welding deformation may be provided.

In addition, the shape definition module is to select only the main parameters (parameters) for the geometric shape, internal materials, size, position, etc. for each member type used in the analysis target model based on the template (template), including the relevant components A parametric modeling unit for defining and constructing a model, a CAD-based pre-shape definition unit for interfacing with a CAD system, and a parametric modeling unit and a pre-form definition unit can be selected and used. It may include a selection unit for providing a shape definition task selection window.

The geometric definition processing module may further include a member attribute definition unit defining attributes of the analysis target model, geometry information, member attribute information, and weld line information of the analysis target model defined by the member attribute definition unit. It may include a file storage to manage in the form.

In addition, the mesh generation module may be based on a weld adjacent node processing unit for processing the basic node (seed node) of the element generation for the weld, and the geometric information, member property information, weld line information received from the geometric definition processing module After checking whether the element size required for welding deformation analysis is in the weld element size DB of the database management unit, the element size calculated by the automatic mesh processing unit and the element size calculated by the recommended element size calculation formula are configured to automatically import the element size if present. It may include a semi-automatic mesh processing unit for displaying the default value (default) of the element size through the input window, and semi-automatically input the element size by modifying the element size through the detailed items of the element size input window.

The boundary condition mapping module may further include a weld boundary condition mapping unit for generating a finite element model by mapping load boundary conditions for welding deformation analysis to element IDs of a weld, and fillet joint or butt welding ( process boundary boundary mapping unit to create a finite element model by mapping boundary conditions for each welding process including butt joints, and boundary conditions identified using the mesh processing values are taken from the boundary condition DB of the database management unit and mapped. It may include a DB-based boundary condition mapping unit for generating a finite element model.

The boundary condition calculation module may include a parametric weld modeling unit for generating a heat transfer analysis geometry model and a geometric model element network based on a template, using geometric shapes, materials, weld types, and geometric dimensions, and the geometric model element networks. A heat transfer analysis unit for outputting a heat transfer analysis result including a heat affected zone by performing a heat transfer analysis using the method, and extracting a boundary condition calculation parameter from the heat transfer analysis result, and using the extracted boundary condition calculation parameter to weld deformation. It may include a boundary condition calculation unit for calculating a boundary condition for simple analysis.

The post-processing module may further include a quality cost calculator that calculates a quality cost using the deformation analysis result, and a lateral shrinkage, a longitudinal shrinkage, and an out-of-plane deformation in the form of a graph or text using the deformation analysis result. A quality satisfaction judgment unit for judging the quality satisfaction by calculating and comparing the respective quality costs for the dimensional quality defects before and after the welding deformation and the weld deformation, and the N! The optimum order determination unit for determining the optimal welding order using a grouping process so that the combination of the welding order of the N is determined by the analysis of N, the tolerance evaluation unit for each process for evaluating the tolerance per process using the defective area ratio, Part where sheet buckling occurs by comparing the normal design value of the geometric dimension of the model to be analyzed with the analysis result value of the deformation analysis result The sheet may include checking buckling assessment of wealth.

In addition, according to another aspect of the present embodiment, A) a shape definition module having a template-based parametric modeling unit and a CAD-based pre-shape definition unit to perform the geometric definition of the analysis target model, and B) the geometric definition processing A module defining attributes of the analysis target model and storing them as geometric information, member property information, and weld line information, and C) a mesh generation module generates a mesh using the geometry information, member property information, and weld line information. And generating mesh processing values including input variables for calculating load conditions, and D) the boundary condition mapping module finds a boundary condition matching the input variables for calculating load conditions or processes a boundary condition calculation request. Generating an element model, and E) the boundary condition calculation module calculates boundary conditions for welding deformation analysis according to the boundary condition calculation request. Transmitting to the gun mapping module, F) welding deformation analysis module performing weld deformation analysis using the finite element model, and G) post-processing module processing deformation analysis results of the welding deformation analysis module. There may be provided a method for evaluating the production impact of a weld deformation, including outputting as a data for evaluating the production impact of the weld deformation.

Further, in the step D), the boundary condition mapping module receives an input variable for load condition calculation including a geometric shape, material, weld type (welding process), and geometric dimensions from the mesh generating module, and calculates the load condition. By using an input variable as a query, it is possible to check whether a boundary condition matching the query exists in the boundary condition DB, and if there is, the boundary condition can be automatically obtained from the boundary condition DB.

In addition, in step E), the boundary condition calculation module generates, by the parametric weld modeling unit, a geometric model for heat transfer analysis using a geometric shape, a material, a weld type, and a geometric dimension based on a template. You can create a mesh model mesh by assigning a mesh to.

Further, after generating the geometric model element network, the heat transfer analysis unit may perform a heat transfer analysis using the geometric model element network to output a heat transfer analysis result including a heat affected zone (HAZ). .

In addition, after outputting the heat transfer analysis result, the boundary condition calculation unit extracts the boundary condition calculation parameter including the temperature history, material, and geometrical characteristic values of the heat affected zone from the heat transfer analysis result, and calculates the boundary condition. Parameters can be used to calculate boundary conditions for simple analysis of weld deformation.

In addition, the boundary condition for simple welding deformation analysis may be used in the boundary condition mapping module or may be stored in the boundary condition DB of the database manager.

An embodiment of the present invention is a shape definition module configured to select any one of a pre-shape definition unit and a parametric modeling unit, geometric information, member property information and weld line information for the analysis target model geometrically defined through the shape definition module Can be implemented in the form of a geometry processing module for managing the file in the form of a file.

In other words, the embodiment of the present invention is limited to the analysis target model even in the initial design stage or the concept design stage where the information on the analysis target model for evaluating the production impact of the welding deformation by the shape definition module and the geometry definition processing module is insufficient. There is an advantage that can quickly and efficiently process the shape definition and geometric information processing.

The embodiment of the present invention manages load, weld, and process boundary conditions in the boundary condition database (DB), so that boundary conditions can be easily applied when generating meshes, and in the absence of boundary conditions for the corresponding welds, The boundary condition calculation module, which has a parametric weld modeling unit, a heat transfer analysis unit, and a boundary condition calculation unit, can be used to calculate boundary conditions easily and quickly according to a formal method directly on the system, and use them for boundary condition mapping in the boundary condition mapping module. There is an advantage.

In addition, an embodiment of the present invention by providing a mesh generating module having a welded adjacent node processing unit, an automatic mesh processing unit, a semi-automatic mesh processing unit, the recommended element size calculation formula or using the weld element size DB, welds adjacent to the weld line Since different finite element sizes can be automatically or manually processed for adjacent portions and non-adjacent portions of welds that are relatively far from the weld line, there is an advantage in that both precision improvement and analysis time reduction can be realized.

In addition, the embodiment of the present invention includes a mesh generation module and a boundary condition mapping module so as to divide the division, it is possible to subdivide the mesh processing and boundary condition processing, it is possible to perform more precise analysis and analysis time There is an advantage to generate a finite element model that can be shortened.

In addition, the embodiment of the present invention calculates the quality cost through the deformation analysis results output from the welding deformation analysis module, to evaluate the amount of shrinkage, to determine the quality satisfaction, to determine the optimal welding order, to evaluate the process-specific tolerances By providing a post-processing module that can evaluate thin plate buckling, the welding deformation affects the production of the welded product to some extent even in the initial design stage or the concept design stage, and the production impact of the weld deformation is severe in terms of quality cost. In this regard, it is possible to easily handle the evaluation of the impact and to establish the standardization of production through evaluation of the impact.

1 is a block diagram of an automatic generation system for the welding deformation analysis of a ship structure according to the prior art.
2 is a block diagram of a production impact evaluation system of the welding deformation according to an embodiment of the present invention.
FIG. 3 is a diagram for describing a selection unit of the shape definition module illustrated in FIG. 2.
FIG. 4 is a capture diagram illustrating the parametric modeling unit of FIG. 3.
5 is a view for explaining a specific method of using the parametric modeling unit of FIG.
FIG. 6 is a capture diagram illustrating the element network generating module illustrated in FIG. 2.
FIG. 7 is a capture diagram illustrating the boundary condition calculation module shown in FIG. 2.
FIG. 8 is a capture diagram of the mesh preview screen shown in FIG. 7.
9 is a flowchart illustrating a boundary condition calculation method by the boundary condition mapping module and the boundary condition calculation module shown in FIG. 2.
10 is a capture diagram of the shrinkage evaluation module of the post-processing module shown in FIG.
11 and 12 are graphs output through the shrinkage evaluation module of FIG. 10.
FIG. 13 is a schematic diagram illustrating an evaluation method of a tolerance evaluation unit and a quality satisfaction determination unit for each process of the post-processing module illustrated in FIG. 2.
FIG. 14 is a graph output by the post-processing module illustrated in FIG. 2.

In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In describing the embodiments of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a production impact evaluation system of the welding deformation according to an embodiment of the present invention.

Referring to FIG. 2, the present embodiment may be a production impact evaluation system 100 of welding deformation.

The production impact evaluation system 100 of the welding deformation includes hardware 101 including device configuration of a computer, a network, and the like, and software 102 for realizing a series of methods described below by such hardware 101. It may include.

For example, the production impact evaluation system 100 of the welding deformation is a software module format for evaluating the production impact of the welding deformation, and the shape definition module 110, the geometry definition processing module 120, and the mesh generation module 130 are described. ), The software 101 having the boundary condition mapping module 140, the boundary condition calculation module 150, the weld deformation analysis module 160, the post-processing module 170, and each module of the software 101 are installed. Hardware 102, which may be one or more computer means or devices.

The shape definition module 110 may be a module that performs geometric definition of the analysis target models A and A ′ for welding deformation analysis and evaluation.

Here, the geometric definition refers to a graphic process in which the parametric modeling unit, the pre-shape definition unit, and the selection unit of the shape definition module 110 geometrically define the analysis target models A and A 'using computer technology. Can mean.

The shape definition module 110 is a template based on the user to select only the main parameters (parameters) for the geometric shape, internal material, size, position, etc. for each member type used in the analysis target model (A, A ') Parametric modeling unit for defining and constructing an analysis target model including components, CAD-based pre-shape definition unit for interfacing with CAD systems (e.g. Global Shipbuilding Computer Aided Design), and A parametric modeling unit and a pre-shape defining unit may be selected to provide a selection window for defining the shape to be used.

The geometric definition processing module 120 includes a part property definition part that defines properties for the analysis target models A and A 'that are geometrically defined in either the parametric modeling part or the pre-shape definition part, and the part property definition. It may include a file storage unit for managing the geometry information 121, the member attribute information 122 and the weld line information 123 for the analysis target model (A, A ') defined by the unit in the form of a file.

Here, the geometric information 121 is geometric shape information so as to know the position and shape of the member used in each analysis target model (A, A '), so that it can be identified by each member, the member identification ID (ID) It is specified by, and may be stored in the form of a neutral file format (eg, IGES, ACIS, STEP, etc.) defining the shape of each analysis target model (A, A ').

In addition, the member attribute information 122 is steel grade and thickness information of the member used in each analysis target model (A, A '), and is divided into member identification IDs used in the geometric information, and corresponds to each member identification ID. Steel grade or thickness information can be recorded and stored in text file format.

The welding line information 123 may be information on whether the member used in each analysis target model (A, A ') is bonded, and information on the property of the weld joint at the time of bonding. The welding line information 123 may be managed by being divided into welding joint identification IDs. The welding line information 123 may include the member identification IDs to be assembled for each welding joint identification ID together with the welding joint identification ID. The welding line information 123 may be recorded and stored in the text file format of the characteristic value of the weld joint indicating the assembly characteristics.

The element network generation module 130 automatically or semi-automatically sizes the elements required for welding deformation analysis based on the geometry information 121, the member property information 122, and the weld line information 123 received from the geometry definition processing module 120. It can take the role of generating element network by receiving input.

For example, the welded adjacent node processing unit of the mesh generating module 130 may play a role of processing the basic node of the element generation for the welded portion.

In addition, the automatic mesh processing unit of the element network generating module 130, the geometric shape (B) received from the geometric processing module 120, the geometric information 121 corresponding to various attribute information, the member attribute information 122, After checking whether the element size required for the welding deformation analysis is based on the weld line information 123 in the weld element size DB of the database management unit 103, the element size may be automatically imported if present.

The element size recorded and stored in the weld element size DB may be information calculated and recorded and managed using the recommended element size calculation formula, the geometry information 121, the member attribute information 122, and the weld line information 123.

The formula for calculating the recommended element size may be configured to calculate a standardized element size for each welded part or process through an inference prediction equation based on empirical or design of experiment (DOE) design, and accordingly, It may not be limited.

Also, the semi-automatic mesh processing unit of the mesh generation module 130 also analyzes the welding deformation based on the geometry information 121, the member property information 122, and the weld line information 123 received from the geometry definition processing module 120. It is possible to check whether the element size required for the welding element size DB of the database management unit 103.

However, if the element size does not exist in the weld element size DB of the database management unit 103, the semi-automatic mesh processing unit displays the default value of the element size calculated by the recommended element size calculation formula through the element size input window. And, by modifying the element size through the detailed items of the element size input window, it may be configured to allow the user to input the element size semi-automatically.

As a result, the mesh generating module 130 transmits the mesh processing value (hereinafter, referred to as mesh processing value C) including the load condition calculation input variable to the boundary condition mapping module 140.

Here, the input variables for calculating the load condition may be a geometric shape, a material, a welded part (welding process), a geometric dimension, or the like.

The boundary condition mapping module 140 queries the input variables (geometric shape, material, weld type, and geometric dimension) for calculating the load condition of the mesh processing value C received from the mesh generating module 130 as a query. After checking whether the boundary condition matching the query exists in the boundary condition DB, if the boundary condition exists, the boundary condition is automatically fetched, and if the boundary condition does not exist, the boundary condition calculation module 150 processes the boundary condition calculation request separately. It can play a role.

The boundary condition mapping module 140 may include a weldment boundary condition mapping unit using a boundary analysis or other boundary condition for welding deformation simple analysis, a process boundary boundary mapping unit, and a DB-based boundary condition mapping unit.

The weld boundary condition mapping unit of the boundary condition mapping module 140 may play a role of professionally mapping only boundary conditions for the weld to generate a corresponding finite element model (D). Here, the weld boundary condition mapping unit may map a boundary condition (for example, a load boundary condition) to the element ID W (see FIG. 7) of the weld.

Boundary condition mapping part of the boundary condition mapping module 140 is a step-by-step process of ship production (eg, cutting the single plate, plywood through the assembly of the single plate, marking process for setting the position of the internal reinforcement, internal materials (internal reinforcement) In-line welding process (eg fillet) such as welding process, heavy assembly process, contrasting process, pre-drying process, block loading in the dock, and rework process to remove possible errors in each process) It can play a role of generating the finite element model (D) by mapping the boundary conditions for each of the (welt joint, butt joint, etc.).

The DB-based boundary condition mapping unit of the boundary condition mapping module 140 obtains the boundary condition identified using the element network processing value C from the boundary condition DB of the database management unit 103 and maps the corresponding finite element. It may be responsible for generating a model (D).

For example, the boundary condition mapping module 140 maps the boundary condition to the mesh processing value C means that the boundary condition (see FIG. 7) corresponds to the element ID W of each welded portion of the mesh processing value C. For example, load boundary conditions).

The boundary condition mapping module 140 may transmit the generated finite element model D to the weld deformation analysis module 160.

The finite element model D may be stored in the form of a neutral file format (eg, IGES, ACIS, STEP, etc.), and may be utilized in the weld deformation analysis module 160 or commercial analysis software described below.

The boundary condition calculation module 150 calculates and transfers the boundary condition 159 for the simple weld deformation analysis to the boundary condition mapping module 140 when the boundary condition calculation request is input from the boundary condition mapping module 140 or later. For the purpose of storing the boundary condition DB of the database management unit 103 for.

The boundary condition calculation module 150 may include a parametric welder modeling unit, a heat transfer analysis unit, a boundary condition calculator and a boundary condition calculation task window 158 (see FIG. 8).

The parametric weld modeling unit of the boundary condition calculation module 150 may play a role of generating a geometric model and a geometric model element network for heat transfer analysis using a geometric shape, a material, a weld type, and a geometric dimension based on a template. Here, the geometric model mesh for heat transfer analysis may be understood as a mesh type mesh representing the two-dimensional or three-dimensional shape and structure of the welded portion.

The heat transfer analysis unit of the boundary condition calculation module 150 outputs a heat transfer analysis result including a heat affected zone (HAZ) by performing a heat transfer analysis using a geometric model element network.

The boundary condition calculation unit of the boundary condition calculation module 150 is configured to extract the boundary condition calculation parameter from the heat transfer analysis result and calculate the boundary condition for welding deformation simple analysis using the extracted boundary condition calculation parameter.

The boundary condition calculation unit is a parameter extraction custom command programmed to extract geometric characteristics of the temperature history, material, and heat affected zone using heat and attribute information corresponding to the weld from the heat affected zone of the heat transfer analysis result. ) May be provided.

Here, the geometric characteristic values of the temperature history, the material, and the heat affected zone may be parameters for calculating boundary conditions.

The boundary condition calculation unit may include an algorithm for calculating boundary conditions for simple analysis of welding deformation using the parameter for boundary condition calculation as an input value.

The boundary condition calculation algorithm of the boundary condition calculation unit uses a thermal elasto-plastic analysis with equivalent heat as an input parameter, an equivalent force method, or the inherent strain of the weld as a thermal expansion coefficient, which is a material property. It may be defined by a formula provided by the analysis method, and the like, and may not be limited to a specific formula in this embodiment.

The weld deformation analysis module 160 may include an analysis solver for performing weld deformation analysis by using the finite element model D having a neutral file format received from the boundary condition mapping module 140.

The post-processing module 170 may be configured to display various information about the welding deformation by dividing the deformation analysis result received from the welding deformation analysis module 160 by displacement, stress, and cost.

For example, the post-processing module 170 may include a quality cost calculator that calculates a quality cost using a deformation analysis result, a lateral shrinkage, a longitudinal shrinkage, and an out-of-plane deformation in the form of a graph or text using the deformation analysis result. Shrinkage evaluation unit for outputting, quality satisfaction judgment unit for judging quality satisfaction by calculating and comparing each quality cost for dimensional quality defects before welding deformation and after welding deformation, and N! Optimal order determination unit to determine the optimal welding order using the grouping process so that the combination of welding order is determined by N analysis, and tolerance evaluation by process to evaluate the tolerance by process using the defective area ratio Compare the normal design value of the geometric dimension of the model with the analysis result of the deformation analysis to check the site where sheet buckling occurs. It may include a plate buckling evaluation.

For example, the quality cost calculation unit calculates an error amount using the normal design value and the analysis result value of the geometric dimension of the analysis target model, and removes the calculated error amount to satisfy the quality of the analysis target model. It can be configured to calculate the quality cost.

In other words, the quality cost is the cost of dimensional comparison evaluation between the normal design value and the analysis result value, and the dimensional defects generated in the block assembly may have the following effects.

First, if the gap between the two blocks is larger than the proper gap required for welding, it can be defined as a poor quality called an overgap, and the generated excess gap may require additional welding time and effort. This additional welding operation can be calculated at quality cost.

For example, the quality cost effect of the excess gap can be calculated by calculating the quality cost generated from the excess gap proportionally by the cross section area of the welded portion used for the welding of the standard titration gap and the cross section area of the welding operation generated in the excess gap.

Second, if the gap between the two blocks is smaller than the proper gap required for welding, additional cutting time and effort to cut the adjacent end of the two blocks will be required because the blocks collide with each other during the assembly of the blocks, thus degrading the joint surface. Can be. This additional cutting operation can be calculated at quality cost. That is, the part that needs to be cut can be calculated at the cost of poor quality by using the cutting length. In general, the oxygen-acetylene cutting method used in shipbuilding can have a constant cutting speed regardless of the thickness of the member. In the process of calculating the quality cost of the same cutting, the thickness of the member may be different from that of the quality cost calculation according to the excessive gap described above. Thus, the quality cost of the cut can be estimated as the quality cost of the cut site by multiplying the length (in meters) required for recutting by the time required for a standard cut per meter.

Third, if a step occurs between the two blocks, additional work time and effort to remove the step before welding assembly may be required. This step removal operation can be calculated at the cost of quality. For example, by combining the estimated deformation amount profile of the assembly site calculated from the analysis solver of the weld deformation analysis module 160 with the attribute information (thickness, steel grade, weld characteristics, etc.) of the member, the mechanical energy inputted to remove the step ( Unit: J) can be calculated to produce the impact of welding deformation at the cost of poor quality.

In addition, the risk of welding deformation can be expressed quantitatively by cost-assessing and summing the production influences on in-plane shrinkage deformation and out-of-plane deformation through the quality cost calculation process calculated in the first and second.

In addition, the quality cost may be calculated as the quality cost using the predicted value considering the welding deformation, that is, the analysis result value obtained through the present embodiment and the actual measured value after welding.

Hereinafter, the detailed configuration and method of the production impact evaluation system for welding deformation will be described with reference to FIGS. 3 to 14.

FIG. 3 is a diagram for describing a selection unit of the shape definition module illustrated in FIG. 2.

Referring to FIG. 3, the shape definition module 110 may display the shape definition job selection window 111 on the screen by the selection unit.

In the shape defining operation selection window 111, a pre-shape definition part selection icon 112, a parametric modeling part selection icon 113, basic information, etc. can be input and a confirmation button or a shape definition operation can be moved to the next step. A cancel button may be provided to close the selection window 111.

If the user selects the preset shape definition part selection icon 112 by a mouse or the like and presses the OK button, the file name input window may be activated.

Alternatively, the parametric modeling unit selection icon 113 is designated by a user mouse or the like, and when the OK button is pressed, the parametric initial work window 113a may be activated as shown in FIG. 4.

The user can read the analysis target model file and the text file including the attribute information in the neutral file format by using a computer interface, etc., and when the reading is performed, the analysis target member can be filtered according to the characteristics of each member.

That is, the analysis target model A related to the CAD system may be filtered and transmitted to the geometric processing module 120 through the pre-shape definition unit (see FIG. 2).

FIG. 4 is a capture diagram for describing the parametric modeling unit of FIG. 3, and FIG. 5 is a diagram for describing a specific method of using the parametric modeling unit of FIG. 4.

Referring to FIG. 4, even in an initial design stage or a concept design stage in which CAD information is not prepared, a user may create a new template or retrieve an old task template through the parametric initial task window 113a.

The user may model an analysis target model A '(see FIG. 5), such as a flat weight block, a flat balance block, a song block, or the like in a parametric or template manner.

According to the modeling of the analysis target model (A ') with reference to Figure 5, the user through the various computer interfaces associated with the parametric modeling unit, the dimensions, member management dimensions, If a number is input, the parametric modeling unit may automatically perform modeling.

In the above manner, the parametric modeling unit models the frame corresponding to the frame assembly, and adds and combines the modeled frame to the heavy assembly model to complete the frame assembly model.

For example, the frame assembly model may be an analysis target model A ′ that is easily modeled by a worker using a parametric modeling unit in an initial design stage or a concept design stage in which the CAD information of the hull is not prepared.

The analysis target model A 'becomes geometric information 121 in a neutral format form including the geometry B by the geometry processing module 120.

FIG. 6 is a capture diagram illustrating the element network generating module illustrated in FIG. 2.

Referring to FIG. 6, the element network generating module 130 includes the geometric information 121 including the geometric shape B, the member property information 122, the weld line information 123, and the weld element size DB of the database manager 103. In addition, the mesh processing value (C) can be generated using the recommended element size calculation formula.

In the element size input window 131 of the element network generating module 130, the element size control item 131a or 131b is set to the default value of the element size calculated by the recommended element size calculation formula or information on the element size existing in the weld element size DB. ) May be displayed.

Basically, the numerical value of the element size control items 131a and 131b may be automatically displayed on the element size input window 131 after being calculated by the welded adjacent node processing unit, the automatic element network processing unit, and the recommended element size calculation formula.

Thereafter, the user may input the element size semi-automatically by modifying the numerical values 131a and 131b of the element size control item.

Here, in the element size control item, the numerical value 131a of the element size of the butt welded portion or the fillet welded portion may be determined relatively densely compared to the numerical value 131b of the element size of the basic element.

When the user presses the model generation button of the element size input window 131, the mesh processing value C to which the mesh is applied to the geometry may be generated.

At this time, element ID (W) corresponding to each welding part is attached to element network process value (C).

The boundary ID may be automatically assigned to the element ID W by the boundary condition mapping module 140 illustrated in FIG. 2.

FIG. 7 is a capture diagram for explaining the boundary condition calculation module shown in FIG. 2, and FIG. 8 is a capture diagram of the mesh preview screen shown in FIG. 7.

Referring to FIG. 7, the boundary condition calculation module 150 may provide a template selection window 151 implemented by the parametric weld modeling unit to calculate the boundary condition for the weld. The fillet welding 152 or the butt welding 153 may be selected through the template selection window 151.

If the fillet welding 152 is selected, the boundary condition calculation work window 158 is displayed, where detailed items relating to the basic fillet welding can be displayed.

In this case, the detail item 153a regarding the butt welding 153 may be displayed in a gray state in a deactivated state.

On the other hand, when the butt welding 153 is selected, all the details 153a regarding the butt welding 153 may be activated and displayed together with the details about the basic fillet welding.

In addition, a geometric model for heat transfer analysis (eg, a weld) corresponding to the selection of the fillet welding 152 or the butt welding 153 may be displayed on the right portion of the boundary condition calculation work window 158.

The parametric weld modeling unit may also play a role in generating and assigning a mesh of the element network to the geometric model for heat transfer analysis.

When the user presses the mesh preview button 154 disposed at the lower left of the boundary condition calculation task window 158, the mesh preview screen 154a as shown in FIG. 8 may be displayed.

Referring to FIG. 8, a mesh preview screen 154a may display a mesh representing a two-dimensional or three-dimensional shape and a structure of a geometric model (eg, a weld) for heat transfer analysis.

Referring to FIG. 7, in addition, when the analysis button 157 disposed on the lower right side of the boundary condition calculation work window 158 is pressed, the boundary condition is interlocked with the heat transfer analyzing unit and the boundary condition calculation unit as shown in FIG. 10. Will be calculated together.

9 is a flowchart illustrating a boundary condition calculation method by the boundary condition mapping module and the boundary condition calculation module shown in FIG. 2.

Referring to FIG. 9, the boundary condition mapping module 140 receives an input variable for calculating a load condition from the element network generating module (S110).

Input parameters for calculating the load condition may be a geometric shape, material, weld type (welding process), geometric dimensions, and the like.

The boundary condition mapping module 140 checks whether a boundary condition matching the query exists in the boundary condition DB using the load variable calculation input variable as a query (S120).

If there is, it is automatically taken from the boundary condition DB and used by the boundary condition mapping module 140 (S180).

On the contrary, if it does not exist, the boundary condition mapping module 140 requests the boundary condition calculation module 150 to calculate the boundary condition.

By the parametric weld modeling unit, the boundary condition calculation module 150 generates a geometric model for heat transfer analysis using a geometric shape, a material, a weld type, and a geometric dimension based on a template (S130). The boundary condition calculation module 150 generates a geometric model element network by applying an element network to the geometric model (S140).

By the heat transfer analysis unit, the boundary condition calculation module 150 outputs a heat transfer analysis result including a heat affected zone (HAZ) by performing a heat transfer analysis using a geometric model element network (S150).

The heat affected zone HAZ may be referred to through FIG. 8.

By the boundary condition calculation unit, the boundary condition calculation module 150 extracts the boundary condition calculation parameter from the heat transfer analysis result (S160). Here, the parameter for calculating the boundary condition may be a geometric characteristic value of the temperature history, the material, and the heat affected zone. The boundary condition calculation module 150 calculates the boundary condition for simple analysis of welding deformation using the boundary condition calculation parameter (S170). The calculated boundary condition for welding deformation simple analysis is used in the boundary condition mapping module 140 (S180) or stored in the boundary condition DB of the database manager (S181).

As mentioned above, the boundary condition calculation unit may include a parameter extraction custom command and an algorithm for calculating the boundary condition for welding deformation simple analysis using the parameter for boundary condition calculation as an input value.

10 is a capture diagram of the shrinkage evaluation module of the post-processing module shown in FIG.

Referring to FIG. 10, the post-processing module may be configured to display various information on welding deformation by dividing the deformation analysis result received from the welding deformation analysis module by displacement, stress, and cost.

For example, the shrinkage evaluation window 171 includes a result set, a result type (by displacement, stress, and cost), a deformation shape (after deformation, before deformation, after deformation + before deformation, actual deformation scale), a tag (maximum value, minimum value). Value), and a variety of information regarding the weld deformation in the text / graph output format can be displayed by selection.

For example, FIGS. 11 and 12 are graphs output through the shrinkage evaluation module of FIG. 10.

11 and 12, the maximum value Max and the minimum value Min due to welding deformation may be displayed together with the geometry in the form of displacement or error amount.

FIG. 13 is a schematic diagram illustrating an evaluation method of a tolerance evaluation unit and a quality satisfaction determination unit for each process of the post-processing module illustrated in FIG. 2.

Taking the abacus 108 as a geometry according to the deformation analysis result, the tolerance evaluation unit and the quality satisfaction judgment unit for each process are responsible for determining whether the weld deformation predicted to occur satisfies the customer's quality requirements recorded in the production specification. can do.

This quality requirement is expressed in the form of tolerance, and it is necessary to express quantitatively how much the quality of the product can be satisfied in the actual pre-production design or production planning stage. The rework requires that the tolerance be met, so a quality cost consideration is needed to evaluate how long the required rework takes.

In general, out-of-plane deformations involve extra heating operations, such as curvature, which repeats heating and cooling, so they can be calculated based on logical formulas using out-of-permissible ranges and corresponding area information. The allowable area ratio according to the Z direction error tolerance of the main plate 108 can be determined.

The defective area ratio may be defined as a ratio of the total area of the abacus 108 to the abacus area outside the tolerance tolerance N (+ value or − value) based on the reference plane M.

In FIG. 13, the abacus 108 is merely shown a two-dimensional shape and may have a three-dimensional shape.

That is, the defective area ratio is a ratio in which the entire area of the main plate 108 becomes the denominator, and the area of the main plate surface that is outside the error tolerance range N (+ value or-value) becomes the numerator based on the reference plane M. Can be.

To this end, the process-specific tolerance evaluation unit of the post-processing module extracts the deformation amount (for example, the process-specific tolerance evaluation unit the out-of-plane deformation value of the member of interest) from the deformation analysis result received from the welding deformation analysis module, The reference plane M is generated, and the defective area ratio is calculated by comparing the errors.

FIG. 14 is a graph output by the post-processing module illustrated in FIG. 2.

Referring to FIG. 14, the graph shows the defective area ratio and the error tolerance.

The user can easily check the defective area ratio according to the error tolerance according to the welding deformation, so that the satisfaction of the error tolerance can be intuitively determined.

In addition, the production impact evaluation system of the welding deformation according to an embodiment of the present invention and the contents described in the method can be implemented in the form of program instructions that can be executed by various computer means can be recorded on a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like.

The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in the computer software arts. Magnetic media, optical media such as CD-ROMs, DVDs, magneto-optical media such as floptical disks, and ROMs, RAMs Hardware devices specifically configured to store and execute program instructions, such as flash memory). In addition, the above-described medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention and vice versa.

Such a technical configuration of the present invention will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the scope of the present invention is represented by the following claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts are included in the scope of the present invention. Should be interpreted.

103: database management unit 110: shape definition module
120: geometric definition processing module 130: element network generation module
140: boundary condition mapping module 150: boundary condition calculation module
160: welding deformation analysis module 170: post-processing module

Claims (13)

A shape definition module for performing geometric definition of the model to be analyzed;
A geometric definition processing module for defining attributes for the analysis target model and storing them as geometric information, member property information, and weld line information;
A mesh generating module for generating meshes using the geometric information, member property information, and weld line information, and generating mesh processing values including input variables for calculating load conditions;
A boundary condition mapping module for finding a boundary condition matching the input variable for calculating the load condition or processing a boundary condition calculation request to generate a finite element model;
A boundary condition calculation module for calculating a boundary condition for welding deformation analysis according to the boundary condition calculation request and transferring the boundary condition to the boundary condition mapping module;
A welding deformation analysis module for performing welding deformation analysis using the finite element model;
And a post-processing module for processing the deformation analysis result of the welding deformation analysis module and outputting it as data for evaluating the production influence of the welding deformation.
Production impact assessment system of weld deformation.
The method of claim 1,
The shape definition module,
A parametric that defines and constructs the model to be analyzed, including related components, by selecting only the main parameters for the geometry, internals, size, and position of each member type used in the model to be analyzed based on the template. (parametric) modeling unit,
CAD-based pre-shape definitions that interface with CAD systems,
It includes a selection unit that provides a selection window for defining the shape to select and use any of the parametric modeling unit and the pre-shape definition unit
Production impact assessment system of weld deformation.
The method of claim 1,
The geometric processing module,
A member property defining unit defining properties of the analysis target model;
It includes a file storage unit for managing the geometry information, the member property information and weld line information for the analysis target model defined by the member property definition unit in the form of a file;
Production impact assessment system of weld deformation.
The method of claim 1,
The element network generation module,
Welded adjacent node processing unit for processing the basic node (seed node) of the element generation for the weld,
Based on the geometric information, the member property information, and the weld line information input from the geometric definition processing module, after confirming that the element size required for the welding deformation analysis is in the weld element size DB of the database manager, the element size is automatically obtained if present. An automatic mesh processing unit configured to come,
Semi-automatic mesh processing unit that displays the default value of the element size calculated by the recommended element size calculation formula through the element size input window and semi-automatically inputs the element size by modifying the element size through the detail items of the element size input window. Containing
Production impact assessment system of weld deformation.
The method of claim 1,
The boundary condition mapping module,
Weld boundary condition mapping unit for generating finite element model by mapping load boundary condition for welding deformation analysis to element ID of welding part, and
Per-process boundary condition mapping unit for generating a finite element model by mapping boundary conditions for each welding process including a fillet joint or a butt joint;
It includes a DB-based boundary condition mapping unit for generating a finite element model by mapping the boundary conditions identified by using the element network processing value from the boundary condition DB of the database manager
Production impact assessment system of weld deformation.
The method of claim 1,
The boundary condition calculation module,
A parametric weld modeling unit for generating geometric models and geometry model elements for heat transfer analysis using geometric shapes, materials, weld types, and geometric dimensions based on templates;
A heat transfer analysis unit for outputting a heat transfer analysis result including a heat affected zone by performing a heat transfer analysis using the geometric model element network;
A boundary condition calculation unit which extracts a boundary condition calculation parameter from the heat transfer analysis result and calculates a boundary condition for welding deformation simple analysis using the extracted boundary condition calculation parameter.
Production impact assessment system of weld deformation.
The method according to any one of claims 1 to 6,
The post-processing module,
A quality cost calculator for calculating a quality cost using the deformation analysis result;
A shrinkage evaluation unit for outputting the transverse shrinkage, the longitudinal shrinkage, and the out-of-plane deformation in the form of a graph or text by using the deformation analysis result;
A quality satisfaction judgment unit for determining quality satisfaction by calculating and comparing respective quality costs for dimensional quality defects before and after welding deformation;
An optimal order determination unit for determining the optimal welding order by using a grouping process such that the combination of N! Welding orders generated by N welding parts is determined by N analysis;
A tolerance evaluation unit for each process of evaluating tolerances by processes using a defective area ratio;
It includes a thin plate buckling evaluation unit for comparing the normal design value for the geometric dimension of the analysis target model and the analysis result value for the deformation analysis result to check the site where the thin plate buckling occurs
Production impact assessment system of weld deformation.
A) a shape definition module having a template-based parametric modeling unit and a CAD-based pre-shape definition unit performing geometric definition of the model to be analyzed;
(B) the geometric definition processing module defining the attributes of the analysis target model and storing them as geometric information, member property information, and weld line information;
C) the mesh generating module generates the mesh using the geometric information, the member property information and the weld line information, and generates a mesh processing value including input variables for calculating load conditions;
(D) the boundary condition mapping module finding a boundary condition matching the input variable for calculating the load condition or processing the boundary condition calculation request to generate a finite element model;
E) the boundary condition calculation module calculates and transmits the boundary condition for welding deformation analysis to the boundary condition mapping module according to the boundary condition calculation request;
F) welding deformation analysis module performing the welding deformation analysis using the finite element model,
G) post-processing module to process the deformation analysis results of the welding deformation analysis module and output as data for evaluating the production impact of the welding deformation;
Method for evaluating the production impact of weld deformation.
The method of claim 8,
In step D),
The boundary condition mapping module receives an input variable for load condition calculation including a geometric shape, material, weld type (welding process), and geometric dimensions from the mesh generating module, and queries the input variable for load condition calculation as a query. Check whether the boundary condition matching the query exists in the boundary condition DB, and automatically obtains the boundary condition from the boundary condition DB when the query exists.
Method for evaluating the production impact of weld deformation.
The method of claim 8,
In step E),
The boundary condition calculation module generates, by a parametric weld modeling unit, a geometric model for heat transfer analysis using geometric shapes, materials, weld types, and geometric dimensions based on a template, and assigns a mesh to the geometric model to provide a geometric model. Generating mesh
Method for evaluating the production impact of weld deformation.
11. The method of claim 10,
After creating the geometric model element mesh,
The heat transfer analysis unit performs a heat transfer analysis using the geometric model element network to output a heat transfer analysis result including a heat affected zone (HAZ).
Method for evaluating the production impact of weld deformation.
The method of claim 11,
After outputting the heat transfer analysis result,
The boundary condition calculation unit extracts the boundary condition calculation parameters including the temperature history, the material, and the geometric characteristic values of the heat affected zone from the heat transfer analysis result, and uses the boundary condition calculation parameters to calculate the boundary condition for the simple welding deformation analysis. To calculate
Method for evaluating the production impact of weld deformation.
13. The method of claim 12,
The boundary condition for the simple deformation analysis of welding,
Used in the boundary condition mapping module or stored in the boundary condition DB of the database manager.
Method for evaluating the production impact of weld deformation.

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