JP5182023B2 - Connector model detection device, connector model detection method, and connector model detection program - Google Patents

Description

  The present invention relates to a technology for detecting a connector model from a three-dimensional model, and in particular, a connector model detection device, a connector model detection method, and a connector model detection for recognizing a connector model by determining a condition regarding a feature shape of the connector model. It is about the program.

  In the development of mechanical products and devices incorporating a wire harness, a cable harness (hereinafter referred to as a harness), etc., the wiring path of the harness is designed three-dimensionally.

  FIG. 7 is a diagram illustrating an example of a three-dimensional design of a harness.

  As shown in FIG. 7A, for example, an operator creates a three-dimensional model of a product (hereinafter referred to as a product model 300) using, for example, a mechanical three-dimensional CAD, and then places the product on the product model 300. A three-dimensional model of the harness (hereinafter referred to as a harness model 400) is created, and the wiring path of the harness is designed while confirming the arrangement relationship between the product and the harness.

  As shown in FIG. 7B, in order to generate the shape of the harness model 400, the operator sets the start point and end point of the harness, the position and tangent direction of the passing point, and the length and thickness of the harness. There is a need. A connector three-dimensional model (connector model 500) is connected to the start point and end point of the harness model 400.

  FIG. 8 is a diagram illustrating an example of a connector model.

  In many cases, a connector has a shape in which pins of the same shape are regularly arranged in an outer shape such as a circle, a rectangle, or a trapezoid. In addition, connectors include a connector with a pin (male) and a connector with a socket connected to the pin (female), and there are combinations that can be connected to each other.

  As shown in FIGS. 8A to 8D, there are a wide variety of connector models 500 having different connector frame shapes, pin shapes, pin numbers, pin arrangements, and the like.

  The harness start / end position and tangent direction match the connector pin position and direction. Therefore, in order to set the start point / end point position and the tangent direction of the harness model 400, the operator selects the connector model 500 from the entire part models constituting the product model 300, and the pins on the connector model 500 Will set the position and direction.

  Specifically, an operator who sets the harness model 400 on the product model 300 selects the connector model 500 by a cursor operation on a screen on which the product model 300 is three-dimensionally displayed. The operator designates the pin position with a cursor or a coordinate value on the connector model 500. Further, the direction of the pin is designated by the normal direction of the surface of the connector model 500 and the rotation of the coordinate system.

A technique for detecting the position and direction of a connector from a camera image or a distance image obtained by imaging the connector is known.
Japanese Patent No. 3361134

  As described above, the designation of the connector model 500 when setting the harness model 400 has been performed manually by the operator, such as searching for the connector model 500 by rotating the product model 300 on the screen. For this reason, setting work may take time, or the operator may make a setting mistake.

  In order to solve the above-described problems, an object of the present invention is to provide a technique that can easily detect a connector model from a three-dimensional model having one or a plurality of component models.

A connector model detection apparatus for detecting a connector model from a three-dimensional model having one or a plurality of component models includes a feature shape designation information storage unit for storing designation information of a feature shape to be extracted, and a feature shape of a connector model to be detected A connector condition storage unit that stores a connector condition indicating a condition related to a feature shape, a feature shape extraction unit that extracts a feature shape designated by feature shape designation information from a part model, and when the extracted feature shape satisfies a connector condition , A connector determination unit for recognizing the component model as a connector model.

  Having one or more component models by extracting the feature shape of the connector model from the three-dimensional component model and determining whether the component model is a connector model based on the conditions related to the feature shape of the connector model From the three-dimensional model, a component model that is a connector model can be easily detected.

  Hereinafter, the present embodiment will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of a connector model detection device according to the present embodiment.

  A connector model, which is a three-dimensional digital model, has pins of the same shape (hereinafter referred to as connector pins) regularly arranged in an outer shape (hereinafter referred to as a connector frame) such as a circle, rectangle or trapezoid. There are many.

  The connector model detection device 10 detects a connector model from a component model, which is an element model constituting a three-dimensional assembly model, using such a feature of the connector model. Further, the connector model detection device 10 automatically detects the connector pin portion of the connector model and obtains the position and direction of the connector pin.

  The connector model detection device 10 is provided in, for example, a three-dimensional CAD or digital mockup having a harness setting function unit 30 for setting a harness model in a three-dimensional model of a product.

  The connector model detection device 10 is realized by hardware such as a CPU / memory provided in a computer and a software program. The connector model detection apparatus 10 includes a three-dimensional model data input unit 11, a feature shape extraction unit 12, a feature shape designation information storage unit 13, a connector determination unit 14, a connector condition storage unit 15, a connector information acquisition unit 16, and a detection result output unit. 17, a feature shape designation information / connector condition registration unit 18, and a connector correspondence information storage unit 19.

  The input data of the connector model detection apparatus 10 is 3D digital model data of one or a plurality of part models constituting the assembly model stored in the 3D model data storage unit 20. Here, it is assumed that the data format of the component model is a triangular polygon format used in general-purpose formats such as VRML (Virtual Reality Modeling Language) and STL (Standard Triangulated Language).

  The three-dimensional model data input unit 11 inputs triangular polygon data of a part model.

  The feature shape extraction unit 12 extracts a predetermined feature shape included in a connector model such as a cylindrical surface or a prismatic surface from the polygon data of the input part model.

  The feature shape extracted by the feature shape extraction unit 12 is set as specified feature shape specification information and stored in the feature shape specification information storage unit 13. There are a wide variety of features used in connectors. The feature shapes used in typical connector models such as cylinders and quadrangular columns may be registered in advance as a library.

  FIG. 2 is a diagram illustrating an example of feature shape extraction according to the present embodiment.

  As a technique for extracting a feature shape from three-dimensional polygon data, there is a known technique such as polygon segmentation (for example, see Reference 1).

[Reference 1]
Marco Attene, Bianca Falcidieno and Michela Spagnuolo, “Hierarchical mesh segmentation based on fitting primitives”, The Visual Computer 22 (3): 181-193, 2006., http://www.ima.ge.cnr.it/ima/ personal / attene / PersonalPage / attene.html
For example, as shown in FIG. 2, the feature shape extraction unit 12 extracts a feature shape from polygon data using a polygon segmentation technique. Here, a cylindrical surface is specified as the feature shape to be extracted, and the cylindrical surface is extracted from the polygon data. At this time, for example, information on the extracted feature shape such as the central axis, radius, height, position, and direction of the cylindrical surface is obtained.

  In some cases, the input part data includes feature shape information. In such a case, the feature shape extraction unit 12 extracts feature shape information from the input component data.

  The connector determination unit 14 determines whether or not the plurality of extracted feature shapes satisfy a predetermined connector condition. When the feature shape extracted from the part model satisfies a predetermined connector condition, the connector determination unit 14 recognizes the part model as a connector model.

  The connector conditions are set in advance and stored in the connector condition storage unit 15. The connector condition may be set by the user every time the connector model is detected, or a typical connector model may be registered in advance as a library.

  FIG. 3 is a diagram illustrating an example of connector conditions according to the present embodiment.

  The connector condition table 150 shown in FIG. 3 includes, for each connector type, a connector ID for uniquely identifying a connector model, a condition A indicating a condition related to a connector frame, a condition B indicating a condition related to a connector pin, and a condition related to the number of connector pins. A connector condition having a condition C indicating

  In condition A, conditions of the shape and size of the connector frame of the connector model to be detected are specified. Condition B specifies the shape and size of the connector pins of the connector model to be detected. In condition C, a condition for the number of connector pins of the connector model to be detected is specified.

  FIG. 4 is a diagram illustrating an example of connector determination according to this embodiment.

  Here, connector model detection will be described using the connector model 200 shown in FIG. 4 as an example.

  The connector condition for extracting the connector model 200 shown in FIG. 4 is the connector condition set as the connector A in the connector condition table 150 shown in FIG. That is, the connector model 200 shown in FIG. 4 has a connector frame 201 that is a cylindrical surface having a circle diameter D1 (condition A). Inside the connector frame 201, there is a connector pin 202 that is a cylindrical surface with a circle diameter of D2 (condition B). The number of connector pins 202 existing inside the connector frame 201 is four (condition C).

  The connector determination unit 14 confirms that the cylindrical surface S1 having the circle diameter D1 exists in the feature shape extracted from the component data (determination of condition A). When the presence of the cylindrical surface S1 is confirmed, the connector determination unit 14 confirms that the cylindrical surface S2 having a circle diameter D2 exists inside the cylindrical surface S1 (determination of condition B). When the presence of the cylindrical surface S2 is confirmed, the connector determination unit 14 confirms that the number of the cylindrical surfaces S2 existing inside the cylindrical surface S1 is four (determination of condition C). When these three conditions are cleared, the connector determination unit 14 authenticates that the component data is the connector model 200 of the connector A.

  In this embodiment, connector determination is performed using connector conditions such as the shape and size of the connector frame, the shape and size of the connector pins, and the number of pins of the connector pins. However, more detailed connector conditions are used. The connector may be determined.

  For example, the connector has a special shape, such as a notch, to prevent rotational symmetry. The connector model 200 shown in FIG. 4 also has a protruding notch 203. If the position condition of the connector pin 202 relative to the notch 203 is included in the connector condition, more detailed connector determination can be performed.

  The connector information acquisition unit 16 acquires information regarding the recognized connector model. The information related to the recognized connector model includes, for example, the connector ID of the recognized connector model, information on the position and direction of the connector pin, and information on the pin number of each connector pin.

  The position and direction of the connector pin can be obtained from the central axis of the connector pin cylinder extracted as the feature shape. Note that the connector pin direction and the connector direction are usually the same.

  Each connector pin of a connector having a plurality of connector pins may be assigned a pin number. The connector is provided with a cutout or the like so as not to be a rotation target, so that the pin numbers match each other when two corresponding connectors are coupled. The connector information acquisition unit 16 can obtain the pin number of each connector pin by using a feature shape such as a notch extracted from the recognized connector model as a mark.

  The detection result output unit 17 outputs the connector information of the recognized connector as the detection result of the connector model. As output data, for example, identification information of the detected connector model, position information such as a position vector with respect to the coordinate system of the component model, direction information such as a direction vector, and the like are output.

  The harness setting function unit 30 is a means for providing a function for setting a harness model in 3D CAD, digital mockup, or the like. The harness setting function unit 30 acquires connector information such as a position and a direction related to the detected connector model as a detection result by the connector model detection device 10.

  Based on the detected position information of the connector model, the position of the connector model on the 3D model of the product is presented to the user who sets the harness model, or the position of the connector pin is determined from the starting point / Support such as setting as the end point can be performed. In addition, the setting of the tangent direction of the harness model can be supported based on the connector pin direction information. Further, when the pin information is included in the connector information, the connection with the connector model on the harness model side can be supported.

  As described above, the connector model detection apparatus 10 according to the present embodiment can easily detect the component model as the connector model by the computer. By presenting the detection result and information of the detected connector model to the user, it is possible to save the user from searching for the connector model when setting the harness model and the labor of setting work.

  The above-described feature shape designation information and connector conditions can be easily registered by fetching them from circuit design data.

  For example, the feature shape designation information / connector condition registration unit 18 takes in the circuit design data, converts the design data of the connector part in the circuit design data, and uses the feature shape, connector frame, and connector pin used in the connector. Are acquired and registered in the feature shape designation information storage unit 13 and the connector condition storage unit 15.

  Thus, by automatically registering the feature shape designation information and connector conditions from the connector design data, it is possible to save the user from setting the feature shape designation information and setting the connector conditions.

  There may be a case where there are a plurality of connector models having the same or similar connector conditions. At this time, a plurality of different connector models may be detected under the same connector condition. In such a case, at the time of setting the harness model, the harness setting function unit 30 presents the detection results of a plurality of similar connector models to the user, and selects the connector model to be the start / end point of the harness model to be set from among them. It is necessary to have you. At this time, the selection of the connector model of the user can be supported by presenting the user with a numerical value indicating the degree of satisfaction of the connector condition of each detected connector model.

  As an example of quantifying the degree to which the connector condition of the detected connector model is satisfied, an example in which the degree of coincidence between the connector model to be detected and the recognized connector model is calculated from the size of the feature shape and the arrangement relationship will be described.

  When extracting the feature shape from the component model, the feature shape extraction unit 12 calculates the shape of the part extracted from the component model as the feature shape and the similarity between the feature shape. In polygon data, the shape of the part model is expressed as a set of triangles. For example, in the extraction of a cylinder, a completely cylindrical part is not extracted. Are extracted as a cylinder.

  The connector determination unit 14 performs approximation determination using a threshold or the like when performing connector determination of a part model using the extracted feature shape. For example, when determining the size of connector frame or connector pin, it is difficult to extract a feature shape that completely matches the size specified in the connector condition. It is determined whether or not there is a feature shape that approximates the determined size. As described above, the connector determination unit 14 determines the connector of the component model based on the degree of approximation with the numerical condition specified by the connector condition.

  The connector information acquisition unit 16 acquires a value indicating the similarity of the feature shape extracted by the feature shape extraction unit 12 and a value indicating the degree of approximation with the numerical condition specified by the connector condition in the connector determination unit 14, These numerical values are applied to a predetermined calculation formula to calculate the degree of coincidence between the connector model to be detected and the recognized connector model.

  When the harness setting function unit 30 acquires information obtained by quantifying the degree of satisfaction of the connector conditions of each connector model as a detection result, the harness setting function unit 30 displays the connector models detected in descending order of the numerical values, and the like. Support connector model selection.

  Thus, even when there are multiple connector models with the same or similar connector conditions, the user can select the connector model by looking at the detected numerical information of the connector model, thus reducing the burden on the user. Is done.

  In setting the harness model, the user may set the harness model directly to the connector model attached to the product model. There is also a connector model on the harness model side, and the user may set the harness model by combining the connector model on the product model side and the connector model on the harness model side.

  The connector correspondence information storage unit 19 stores connector correspondence information indicating preset combinations of connectors that can be coupled to each other.

  FIG. 5 is a diagram showing an example of connector correspondence information according to the present embodiment.

  In the connector correspondence table 190 shown in FIG. 5, a combination of connector ID (a) and connector ID (b) of connectors that can be coupled to each other is designated.

  For example, when a connector model whose connector ID is “Con — 001” is detected from the assembly model of the product, the connector model required for the end of the harness model having the connector model as the start point / end point corresponds to the connector shown in FIG. From the table 190, the connector model with the connector ID “Con_101” is obtained.

  The connector information acquisition unit 16 acquires information on a connector model that can be combined with the recognized connector model based on the connector correspondence information.

  When the harness setting function unit 30 acquires information on the connector model that can be combined with the connector model detected as a detection result, the harness setting function unit 30 automatically sets the connector model that can be combined with the detected connector model as a part of the harness model to be set. To generate.

  This saves the user the burden of searching for the connector model that is the end on the harness model side set by the user.

  FIG. 6 is a flowchart of the connector model detection process performed by the connector model detection apparatus according to this embodiment.

  Here, the flow of an example in which a connector model is detected by determining whether or not each part model constituting the product assembly model is a connector model will be described. The connector conditions include the connector frame shape and size conditions (condition A), the connector pin shape and size conditions (condition B), and the number of connector pins as shown in the connector condition table 150 of FIG. It is assumed that the connector condition has three conditions (condition C).

  In the connector model detection apparatus 10, the three-dimensional model data input unit 11 inputs a part model (step S10). For example, the three-dimensional model data input unit 11 selects one part model from the product assembly model and inputs the polygon data.

  The feature shape extraction unit 12 extracts a predetermined feature shape from the input part model (step S11). For example, the feature shape extraction unit 12 extracts a predetermined feature shape such as a cylinder or a quadrangular prism from the polygon data of the input part model using a technique such as polygon segmentation. The predetermined feature shape is a feature shape designated by the feature shape designation information. Feature shape designation information of a connector model to be detected is preset in the feature shape designation information storage unit 13.

  The connector determination unit 14 selects one feature shape extracted from the part model (step S12).

  The connector determination unit 14 determines condition A (step S13). For example, in the case of the determination of the connector A in the connector condition table 150 of FIG. 3, the connector determination unit 14 determines whether the selected feature shape is a cylindrical surface S1 having a circle diameter D1.

  If the determination of condition A is OK (OK in step S13), the connector determination unit 14 determines the condition B (step S14). For example, in the case of the determination of the connector A in the connector condition table 150 of FIG. 3, the connector determination unit 14 determines that the selected feature shape is inside the selected feature shape if the selected feature shape is the cylindrical surface S1 having a circle diameter D1. It is confirmed whether or not there is a cylindrical surface S2 having a circle diameter D2.

  If the determination of condition B is OK (OK in step S14), the connector determination unit 14 determines the condition C (step S15). For example, in the case of the determination of the connector A in the connector condition table 150 of FIG. 3, the connector determination unit 14 selects the selected feature if the cylindrical surface S2 having a circle diameter D2 exists inside the selected feature shape. It is confirmed whether the number of cylindrical surfaces S2 existing in the shape is four.

  If the determination of condition C is OK (OK in step S15), the connector determination unit 14 recognizes that the component model is a connector model (step S16). For example, in the case of the determination of the connector A in the connector condition table 150 of FIG. 3, the connector determination unit 14 determines that if the number of cylindrical surfaces S2 existing in the selected feature shape is four, the component being determined as a connector The model is recognized as the connector model of connector A.

  The connector information acquisition unit 16 acquires connector information related to the recognized connector model (step S17). For example, the connector information acquisition unit 16 acquires connector information such as identification information of a recognized connector model, connector pin position information, and direction information.

  When it is NG in any one of the conditions A to C (NG in step S13, NG in step S14, NG in step S15), the connector determination unit 14 has another unprocessed feature shape ( In step S18, the process returns to step S12 to select the next feature shape. If the processing has been completed for all the extracted feature shapes (YES in step S18), the connector determination unit 14 determines that the part model is not a connector model corresponding to the connector condition (step S19).

  If the connector model detection process as shown in FIG. 6 is executed for each part model constituting the product assembly model, the detection result of the connector model in the product assembly model can be obtained.

  In the connector model detection process shown in FIG. 6, the connector model is detected under the connector condition of one type of connector. However, the connector model may be detected under the connector conditions of a plurality of types of connector models. .

  For example, in the connector model detection process shown in FIG. 6, the connector model detection apparatus 10 performs steps S13 to S15 for all connector types (connector A, connector B,...) Set in the connector condition table 150. If this condition determination is performed, a plurality of types of connector models can be detected.

  If the process is performed by letting the user specify one from the connector conditions of a plurality of types of connectors set in the connector condition table 150, the connector model detection apparatus 10 detects the specific connector model specified by the user. Can do.

  The processing by the connector model detection apparatus 10 described above can be realized by hardware such as CPU and memory provided in the computer and a software program, and the program can be recorded on a computer-readable recording medium through a network. It is also possible to provide.

  Although the present embodiment has been described above, the present invention can naturally be modified in various ways within the scope of the gist thereof.

It is a figure which shows the structural example of the connector model detection apparatus by this Embodiment. It is a figure explaining the example of extraction of the feature shape by this Embodiment. It is a figure which shows the example of the connector conditions by this Embodiment. It is a figure explaining the example of the connector determination by this Embodiment. It is a figure which shows the example of the connector corresponding | compatible information by this Embodiment. It is a flowchart of the connector model detection process by the connector model detection apparatus of this Embodiment. It is a figure which shows the example of the three-dimensional design of a harness. It is a figure which shows the example of a connector model.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Connector model detection apparatus 11 3D model data input part 12 Feature shape extraction part 13 Feature shape designation | designated information storage part 14 Connector determination part 15 Connector condition memory | storage part 16 Connector information acquisition part 17 Detection result output part 18 Feature shape designation | designated information / connector Condition registration unit 19 Connector correspondence information storage unit 20 3D model data storage unit 30 Harness setting function unit

Claims (5)

A connector model detection device for detecting a connector model from a three-dimensional model having one or more component models,
A feature shape designation information storage unit for storing feature shape designation information to be extracted;
A connector condition storage unit for storing a connector condition indicating a condition related to a feature shape of a connector model to be detected;
A feature shape extraction unit for extracting a feature shape designated by the feature shape designation information from the component model;
A connector model detection device comprising: a connector determination unit that recognizes the component model as a connector model when the extracted feature shape satisfies the connector condition. The connector information acquisition part which acquires the information on the position and direction of the connector pin which the recognized connector model has based on the information on the position and direction of the extracted feature shape. The connector model detection device described. A connector correspondence information storage unit for storing connector correspondence information indicating combinations of connectors that can be coupled to each other;
The connector-information obtaining unit, based on the connector corresponding information, the connector model detection apparatus according to 請 Motomeko 2 you and acquires the information of the connector model corresponding to the recognized connector model. From a three-dimensional model having one or a plurality of component models, a connector having a storage unit for storing specification information of the feature shape to be extracted and a connector condition indicating a condition related to the feature shape of the connector model to be detected is connected to the connector. A connector model detection method for detecting a model,
The computer is
Extracting the feature shape designated by the feature shape designation information stored in the storage unit from the component model;
And a step of recognizing the component model as a connector model when the extracted feature shape satisfies a connector condition stored in the storage unit. A program for causing a computer to detect a connector model from a three-dimensional model having one or more part models,
Said computer,
A feature shape designation information storage unit for storing feature shape designation information to be extracted;
A connector condition storage unit for storing a connector condition indicating a condition related to a feature shape of a connector model to be detected;
A feature shape extraction unit for extracting a feature shape designated by the feature shape designation information from the component model;
A connector model detection program for functioning as a connector determination unit that recognizes the component model as a connector model when the extracted feature shape satisfies the connector condition.

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