JP3377732B2 - Hull shape data creation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing with a precision necessary for constructing an actual ship from a concept design of a hull shape, that is, a fairing of a hull shape is carried out and the fairing result is used to obtain high precision. The present invention relates to a hull shape data creation device for creating a smooth surface model.

[0002]

2. Description of the Related Art Recently, in the field of shipbuilding, CIM (Computer Integrated Manufa
cturing: Development of a computer-based integrated management production system) is underway. In ship development, in addition to performance evaluation of tank tests, CFD (Compatational Fluid Dynami)
cs: Computational fluid dynamics) is being used for performance estimation. In this case, the problem is whether the three-dimensional hull shape can be expressed with high accuracy on a computer. Therefore, it is an important issue to be able to quickly create data that accurately represents the hull shape. .

On the other hand, the hull shape has a complicated shape in which a portion having a large change in curvature locally and a portion having a small change in curvature are smoothly connected locally at the bow and tail, and high precision is required for accurate expression of this shape. Surface model, which in turn requires a high-precision, high-density wireframe model. As a result, in order to obtain a high-precision and high-density wireframe model, it is necessary to perform a fairing with high precision, and for the above-mentioned CIM, a fairing that can be unified in design, research, and production technology is required. Become. Here, the fairing represents the hull in a three-dimensional view of the front, the plane, and the side. While performing the work in which each of these sectional lines becomes a fair (shaped) curve, the three-dimensional views are aligned. It is the work of smoothing so that the curved surface of the ship is sufficiently smooth.

Despite the above-mentioned requirements, in the present fairing work, the batten (slender strip-shaped ruler) is adjusted to the cross-sectional shape of the hull based on the conventional concept design (drawing). Bending Lines (Wireframe)
Although work using computer software dedicated to fairing and work using both of these are performed, the rounding of the bow and tail ends of a complex curved surface often depends on the manual work of a skilled person. Even if you use software that programs rounding with arcs and ellipses, fairing work to obtain consistency is a manual task. In addition, surface modeling of the hull is not general, it is limited to the lines or wireframe representation, and the entire hull is used as a high-precision surface model that can be used to construct an actual ship using the wireframe of the hull. The technology that can completely define is not yet established. Further, at the above-mentioned stage, naturally, there is no device for a ship development system having an NC program creating function for creating a test model for evaluating the propulsive performance of a ship.

[0005]

As described above, the manual work or the fairing work using both the manual work and the lines fairing software requires many years of skill,
It takes a huge amount of time for man-hours. For this reason, the fairing that can be unified due to the above-mentioned CIM is far short.

Further, the conventional commercially available fairing software is not limited to the creation of a wire frame model, in other words, hull lines for ensuring the consistency among the three faces of the hull, which are the front, the plane and the side. It is provided for creation, and even if you try to apply modeling using a general-purpose surface modeler used in the field of automobiles, aircraft, or parts design, it takes a lot of man-hours on the data side and a three-dimensional There is a difficulty in accuracy as a surface modeling having a twist and a complicated curved surface of the bow and tail ends.

In addition, because a high-precision surface model for such a hull cannot be created, an NC machining program (NC data) based on the surface model is used in making a test model for propulsion performance evaluation of a ship. Cannot be created.

In view of the above problems, the present invention eliminates the conventional manual work and enables fairing to reach a centralization for CIM, and also enables high precision surface modeling as well as wire frame. The present invention provides a hull shape data creation device for creating an NC program for making a test model for designing and general drawing of hull appendages and peripheral members necessary for ship development, and evaluation of ship propulsion performance.

[0009]

The present invention which achieves the above object has the following matters for specifying the invention. (1) Bi-directional data transfer to / from each of the interactive fairing device, the automatic bow-stern rounding device, and the surface modeler device via the lines file storage means of the lines file obtained from the offset based on the concept design of the hull in a possible and the integral hull shape data creation device
There are, as the surface modeller apparatus, by introducing a surface modeller of generic three-dimensional CAD kernel, to the control means of the Lines systems needed to create a hull shape data, and rounding bow tail automatically the interactive fairing device Lines file input / output means to the lines system configured by the device, calculation means for creating a surface model, NC program creation calculation means for performing NC machining using this surface model, general mechanical CA
A calculation means having a drawing function shown in D, a calculation means for creating standard lines for expressing the ship shape of the ship,
Arrangement of vessel arithmetic operation means for calculating the amount of drainage and inundation area necessary for ship planning, means for displaying drawing drawings on the screen in each work process and means for storing various data, and an input device and It is characterized by having an interface with an output device. ( 2 ) In (1) above, as the interactive fairing device, an offset created based on the concept design of the ship is taken in from an input device, and the input data is used to rearrange the data into a prescribed format. Curve fairing calculation for performing lines fairing using lines file creation / display means, lines file storage means, and lines file on a computer screen, and using approximate expressions or arbitrary functions built into the arithmetic unit Display means, lines data creation / display means for making the faired data as new data having attributes such as boundaries, knuckle lines, fixed points, movable points, etc., and lines data storage means for this lines data By using attributed data, representative control lines and boundary lines Lines fairing that defines the partition and arranges an offset in that area, expresses it as a three-dimensional wireframe model that is a cut surface of the front, plane, and side surfaces, and performs matching between the three surfaces and smoothing as a curved surface. The calculation means, the data creation / display means for cutting as an arbitrary cut surface, the cut surface data storage means, and the cut surface data and the lines fairing calculation result for judging the quality of these wire frame models. An operation means for calculating a cutting plane using the same, a creation / display means for creating conversion instruction data for creating a lines file from the lines data and the cutting surface data, a conversion instruction data storage means, and a data conversion operation for performing data conversion processing Means for laying out the data in any drawing format using the means and the results obtained by the cutting plane calculation operation means. Create drawing data /
It is characterized in that it has a display means, this drawing data storage means, and a calculation / display means for performing a drawing process using the drawing data. ( 3 ) In (1) above, the automatic rounding device for the fore-and-aft, while considering the connection conditions based on the data obtained by performing knuckle processing and fairing with a virtual width at the fore-and-aft end of the hull, An arithmetic / display means for automatically performing a rounding process using an internally set function, an arithmetic / display means for controlling the degree of rounding using the automatically rounded data, and this rounded data storage means, It is characterized by having.

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will now be described with reference to the drawings. Here, first, the work for creating the line diagram will be outlined. In the creation work, there is a work for planning the hull form that satisfies the performance and layout required for the ship, and a fair that finishes the hull shape to the required accuracy while keeping the consistency as a three-dimensional curved surface smooth. It consists of ring work. And, in each department of design, research, and production technology, a diagram that reflects each purpose is necessary.

FIG. 1 is a flow chart for creating a diagram, etc. At the start of design, the design department examines the existing similar ship type based on the design conditions and creates a rough initial diagram. On the other hand, within the Research and Development Department, the initial line diagram and design conditions are used as a reference to plan the hull form and create a plan diagram with consideration of propulsion performance. Then, in the research and development department, this planning diagram is finished while exchanging information such as arrangement with the designing department, and fairing is done to the accuracy necessary for manufacturing the model vessel for the aquarium test to obtain the model diagram. A water tank test is conducted after the model wire is manufactured, and the ship shape is determined while confirming the performance. After that, fairing is performed to create a construction diagram, and further to the accuracy required for creating a construction diagram. In this way, repeated fairing is repeated based on the initial diagram to create the final diagram, and the detailed design of the hull is started.

Now, in creating a diagram, the new system of the present invention is a general-purpose CA, which is a device capable of interactively performing high-precision and high-density fairing for each wireframe model.
D: A surface modeler that uses a surface modeler that operates a control line consisting of a three-dimensional space curve to model the hull shape, and an automatic rounding device for the bow and tail with large curvature changes. Data files can be sent and received bidirectionally so that they can be used together.

First, referring to FIGS. 2 and 3, the system is started by the hull shape data creation system control means 3, and the concept design (drawing) of the hull form (FIG. 5).
The offset (three-dimensional coordinate value for expressing the hull) is read from (reference) and input to the hull shape data creation system 35 by the input device 13. In the hull shape data creation system 35, first, using the input offset data, the hull fair is created by using the data creation means, the drawing drawing display means, the calculation means, the data storage means, etc., which constitute the interactive lines fairing device 30. Make a ring. In this case, the fairing of the hull is a three-sided view consisting of the front (body plan), the plane (water line), and the side (buttock line) of the hull (plane cutaway views perpendicular to the length direction, the depth direction, and the width direction). In this case, the smoothing is performed so that the cross-sectional lines of each drawing are fair curves, the three surfaces are aligned, and the curved surface is sufficiently smooth as a hull (see FIG. 6). Further, in this interactive fairing device 30, as the first work stage to start the fairing, the knuckle process is applied to the fairing by giving a certain virtual width to the most complicated bow-tail end of the curved surfaces forming the hull. carry out.

Then, in the bow-and-tail automatic rounding device 34,
While using the drawing display means, arithmetic means, and data storage means that compose this, the knuckle-processed data at the ends is used and the connection conditions with the main hull are taken into consideration, while automatically using the internally set functions. Rounding processing (see FIG. 7).
Then, based on this rounded data, the degree of rounding is determined by using the control function while considering the propulsive performance and workability of the ship.

After that, the rounding data created by the automatic rounding device 34 at the fore and tail ends are fed back to the hull data created by the interactive lines fairing device 30, and the surface modeler device 2 is based on both of these data. Surface modeling of the hull (see FIG. 8) is performed while using the constituent drawing display means / arithmetic means and data storage means.
Here, in order to confirm the accuracy of the surface model of the created hull, it is possible to create a cut surface with a fine mesh using the function of the calculation means and evaluate it, and if the required accuracy is satisfied, calculate The surface model of the hull is required by confirming the drainage, which is the design condition, using the function of the means. That is, the accuracy of the surface model is verified (see FIG. 9) and the design conditions are verified. After confirming the accuracy and design conditions, if it is in accordance with the requirements, the propulsive performance is confirmed by using the calculation means of the surface modeler device 2 based on the high-precision surface model. NC machining program for the model ship under test (Fig. 1
0, 11) to create a surface model of a ship / shaft bracket / boshing, etc., such as a hull appendage around the propeller, drawing (see Fig. 12), and the final ship creation result to a highly accurate wireframe. It is possible to create standard lines including forms such as offsets for expressing (see FIG. 13). If the accuracy and design conditions do not meet the requirements, return to the interactive fairing device 30 using the standard lines data, which is several times more accurate than the rough offset of the initial hull concept design, and return to the bow and tail end. Surface model creation and verification by the automatic rounding device 34 and the surface modeler device 2 are repeated. In this way, it is possible to create high-accuracy surface models required for the construction of an actual ship, and to create highly efficient hull shape data using the functions with excellent operability and versatility.

FIG. 4 shows a ship shape data creation system 35 activated by the ship shape data creation system control means 3.
FIG. 4 is a detailed view of FIG. 3, in which the input device 13, the interactive lines fairing device 30, the automatic bow and tail end rounding device 34, and the surface modeler device 2 correspond to FIG. 2 or FIG. Then, these exchange data files via the lines file storage means. In FIG. 4, the main body of the surface modeler device 2, which is started and ended by the hull shape data creation device 3, introduces a general-purpose surface modeler 1 into a three-dimensional CAD kernel, which is necessary for creating the hull shape data. Functions are arranged. That is, as the necessary functions, the surface modeler device 2 includes a calculation means 4 for creating a surface model of a ship, an NC program creation calculation means 5 for performing NC machining using this surface model, and a general Computation means 6 having a drafting function as seen in mechanical CAD, computation means 7 for creating standard lines for expressing the ship shape of a ship, calculation of drainage volume and inundation area necessary for ship planning It is equipped with a vessel arithmetic operation means 8 for carrying out the operation, a means 9 for displaying a drawing on the screen in each work process, and a means 10 for storing various data, and a lines system control means 11 and lines which are indispensable for creating hull shape data. It is connected to the file input / output means 12, and further has an interface with the input device 13 and the output device 14.

Next, the interactive lines fairing device 3
For 0, the hull information such as offset (three-dimensional coordinate value for expressing the hull) created based on the concept design of the hull is fetched from the input device 13 and rearranged into a prescribed format using the input data. Lines file creation /
Display means 15, curve fairing calculation / display means 17 for fairing using an approximate expression or an arbitrary function incorporated in the arithmetic device by calling the lines file on the screen of the computer, the faired data A line data creating / displaying means 18 and its line data storing means 19 for recreating as a new data having an attribute such as a boundary line, a knuckle line, a fixed point, a movable point, etc. A closed section is defined by various control lines (& boundary lines), an offset is arranged in that area, and it is expressed as a three-dimensional wireframe model that is a cut surface of front, plane, and side, and matching between three planes Line fairing operation means 20 for performing smoothing as a curved surface and a curved surface, and judging quality of the created wire frame model Therefore, the data creation for cutting as any cutting plane / display means 21 and the cut surface data storage means 22, calculating means 23 for cutting surface calculated using this cutting plane data and Lines fairing operation result,
From the lines data and the cutting plane data, conversion instruction data creation / display means 24 for creating a lines file and its conversion instruction data storage means 25, data conversion calculation means 26 for performing data conversion processing, and cutting plane calculation calculation means. Drawing data creation / display means 27 for laying out data in an arbitrary drawing format using the results obtained in step 7, drawing data storage means 28, and calculation / display means 29 for carrying out drawing processing using this drawing data. And an interface to the device 14 for outputting the result to a plotter or the like.

Further, in the automatic bow / tail end rounding device 34, the knuckle processing is performed by giving a certain virtual width to the most complicated bow / tail end of the curved surface forming the hull as the first working stage to start the fairing. Arithmetic / display means 31 for automatically performing a rounding process using an internally set function based on the data of the interactive fairing device 30 for carrying out the fairing while considering the connection condition with the main hull. A rounding data storage means 33 and a calculation / display means 32 for controlling the degree of rounding (sharp & plant) using automatically rounded data are provided.

Then, these surface modeler devices 2,
Interactive fairing device 30, automatic bow and tail rounding device 3
Reference numeral 4 denotes the lines system control means 11 or the lines file storage means 16 stores the lines file 16 or the lines system control means 11.
An integrated hull shape data creation system 35 capable of bidirectional traffic is constructed to create a highly accurate surface model.

In the block structure shown in FIG.
The offset (three-dimensional coordinate value for expressing the hull) is read from the hull form concept design shown in FIG. 5, the hull shape data creation system control means 3 activates the hull shape data creation system, and the offset is interactively input from the input device 13. Input to the mold lines fairing device 30. With this offset, the lines file creation / display means 15 is used to create a lines file which is shared data for various arithmetic processes, and the lines file storage means 16 is used.
Store at. Call the necessary data from this lines file to the curve fairing calculation / display means 17,
Fairing is performed using various functions of the computing means so that the curve (cross-section line) of the concept design becomes a fair and smooth curve, and the lines file storage means 16 is fed back. Input data for operating the lines fairing calculation means 20 is created using the lines data creation / display means 18 based on the updated data. In the lines data creation / display means 18,
Create data with attributes such as boundaries, knuckle lines, fixed points, and movable points. In the lines fairing computing means 20, the hull is represented by a three-view drawing of the front, plane, and side surfaces, and the work is performed so that each of these cross-section lines becomes a fair curve, while maintaining consistency between the three surfaces. Smoothing is performed so that the hull has a sufficiently smooth curved surface. In order to judge the quality of the hull which is the wire frame model created here, data for expressing as an arbitrary cutting plane is created by using the cutting plane data creating / displaying means 21, and this cutting plane data 22 and Lines fairing calculation means 20
Using the result of (3), the cutting plane calculation calculation means 23 performs calculation. Then, in order to update the result calculated here as a lines file, it is calculated by the data conversion calculation means 26 based on the data created by the conversion instruction data creation / display means 24, and the lines file storage means 16 Give feedback to. Further, by using the result obtained by the cutting plane calculation calculation means 23, the drawing data creation / display means 27 creates data for laying out in an arbitrary drawing format and outputting to the screen display or plotter, and the drawing processing calculation / Activate the display means 29. By matching the three faces of the front, plane, and side, it is output as general hull lines (Fig. 6).

Next, in the bow / tail end automatic rounding device 34 shown in FIG. 4, the drawing drawing display means / arithmetic means constituting this device,
Using the data storage means (see FIG. 2), the knuckle-processed data is used at the ends, and the rounding process is automatically performed using the internally set function while considering the connection condition with the main hull. The result of the rounding processing is performed by the rounding degree calculation / display means 3 while considering the propulsion performance and workability of the ship.
The degree of rounding is controlled by 2 and determined. An example of the output of the work performed here is shown in FIG.

Next, on the basis of the data created by the interactive lines fairing device 30 and the automatic bow-stern end rounding device 34, the surface modeler computing device 4 constituting the surface modeler device 2, the drawing drawing display means 9, and various types. Surface modeling of the hull is performed using the data storage means 10. An example of the surface model of the hull created here is shown in FIG. Further, in order to confirm the accuracy of the surface model, FIG. 9 shows an evaluation sectional view in which a cut surface is created with a fine mesh by using the function of the calculating means. If the required accuracy is satisfied, the ship calculation method means 8 is used to confirm the drainage amount, which is a design condition, and the surface model creation of the hull is completed. If the required accuracy and design conditions are not met, return to the interactive fairing device 30 using the data of Standard Lines, which is several times more accurate than the rough offset of the initial ship concept design, and perform the above work. Fairing can be repeated in the process. Further, fairing using the arithmetic function of the surface modeler device 2 is also possible, and further fairing by incorporating these results in the interactive lines fairing device 30 is also possible.

On the basis of the high-accuracy surface model obtained above, an NC machining program for a test model ship or the like for confirming propulsive performance is prepared by using the NC program preparation calculation means 5 of the surface modeler device 2. . Figure 10 shows NC
The simulation result of the cutter line for machining is shown, and FIG. 11 shows an output example of the NC program. In addition, in FIG. 11, G (preparation, correction, cycle machining) function, S (spindle) function, T (tool) function, M (auxiliary) function, F speed, coordinates X, Y, Z, etc. conform to the NC language. is doing. Further, as related work for creating the hull shape data, the surface model of the hull surface model is used as a base, and the surface model creation of the hull appendages such as rudder / shaft bracket / bossing and the drawing work are performed using the drawing function calculation means 6. . The drawing result is shown in FIG. In addition, from the surface model of the hull, the final ship shape drawing result to be distributed to each part etc. is expressed in wire frame and standard lines (including forms such as offset) are created. This drawing result is shown in Figure 1.
3 shows.

With the above, one working example of the hull form development by the hull form development system device is completed. In this way, the highly accurate surface model creation work required for the construction of an actual ship, the drafting work, and the NC program creation work for making a test model, etc. use highly functional and versatile functions. It can be realized as a highly efficient hull form development work.

[0025]

As described above, according to the present invention, the interactive fairing device and the automatic bow-end rounding of the bow and tail end through the lines file storage means of the lines file obtained from the offset based on the concept design of the hull. apparatus,
By using an integrated hull shape data creation device that enables bidirectional data transfer to and from each surface modeler device, a highly accurate wireframe or surface model can be obtained and an NC program can be created. Or, the fairing work using both manual work and fairing software requires many years of skill, but the time required for these can be greatly shortened. Further, to an accuracy required to build a real ship had been essential enormous man-hours for work done fairing, it can be performed in a short time. Conventionally, most of the lines-fairing software that is commercially available and widely used is limited to the creation of a wireframe model, but this device can create a highly accurate surface model. Some fairing systems can be used for surface modeling, but the types of vessels that can be handled are limited, and in reality, highly accurate complete surface modeling including around the bow valve and the stern tube of the stern has not been realized. However, this device enables surface modeling of any ship. When the surface model of the hull is done using a general-purpose surface modeler of mechanical CAD, it takes a lot of man-hours to create the data, and also for the surface modeling having a three-dimensional twist peculiar to the hull and a complicated curved surface of the bow and tail ends. However, due to the invention of this device, surface modeling is possible without using them, and the man-hours are significantly reduced. In addition, the existing fairing system is specialized for making hull lines as a tool for ensuring consistency between the three faces of the cut surface of the hull: front, plane, and side surfaces. It lacked the drawing function, design design function, general-purpose surface modeling function, etc. like mechanical CAD, which is widely used in the field of design, and was inferior in terms of operability, functionality and versatility. These will be possible with improvements. Conventionally, since it was not possible to create a highly accurate surface model, it was not possible to create a program (NC data) for NC machining based on a surface model in making a test model for evaluating the propulsion performance of a ship. Then, this becomes possible, and the model production period and its cost are greatly reduced.

[Brief description of drawings]

FIG. 1 is a schematic flowchart of hull design.

FIG. 2 is a schematic block diagram of a hull shape data creation system.

FIG. 3 is a flowchart of an example of a procedure.

FIG. 4 is a detailed block diagram.

FIG. 5 is a diagram of an example of a ship type concept design.

FIG. 6 is a diagram showing an output example of a fairing result.

FIG. 7 is a diagram of a rounding process.

FIG. 8 is a diagram of a surface model.

FIG. 9 is a diagram of a cross-sectional model for accuracy verification evaluation of a surface model.

FIG. 10 is a diagram of a cutter line simulation for NC processing.

FIG. 11 is an explanatory diagram of an NC program output example.

FIG. 12 is a diagram showing an example of drawing a hull appendage.

FIG. 13 is a diagram of a standard lines output example.

[Explanation of symbols]

1 General-purpose surface modeler 2 Surface modeler device 16 lines file storage means 30 Interactive lines fairing device 34 Automatic bow-end rounding device

Claims (3)

(57) [Claims] 1. An operation based on the concept design of the hull.
Lines file of Lines file obtained from Husset
Interactive fairing device, stern via ill storage means
Bidirectional for each of the automatic rounding device and the surface modeler device
Integrated hull shape data creation that enables data transfer to and from
As the surface modeler device, a general-purpose surface modeler is introduced into a three-dimensional CAD kernel, and a control means of the lines system necessary for creating hull shape data is added to the surface modeler.
Lines file input / output means to the lines system configured by the interactive fairing device and the bow-end automatic rounding device, calculation means for creating a surface model,
N for NC processing using this surface model
C program creation calculation means, calculation means having a drafting function found in general mechanical CAD, calculation means for creating standard lines for expressing the shape of a ship, and calculations necessary for planning a ship Ship hull form data, characterized by arranging ship arithmetic operation means for displaying, drawing means on the screen in each work process and means for storing various data, and having an interface with an input device and an output device Creation device. 2. The interactive fairing device includes:
The line file creation / display means that takes in the offset created based on the concept design of the hull from the input device and rearranges it in the specified format using this input data, the storage means of the line file, and the line file Call on the computer screen,
Curve fairing calculation / display means for performing fairing using an approximate expression or arbitrary function incorporated in the arithmetic unit, and lines data creation / display for recreating the faired data as new data having attributes Means and lines data storage means of this lines data, using the attributed data, the definition of a closed section by a typical control line or boundary line, and the offset is arranged in that area, and front, plane, side In order to judge whether the wireframe model is good or bad, a lines fairing calculation means that expresses it as a three-dimensional wireframe model which is a cut surface of 3
Data creation / display means for cutting as an arbitrary cut surface, this cut surface data storage means, calculation means for calculating the cut surface using this cut surface data and the line fairing calculation result, lines data and cut surface The conversion instruction data creation / display means for creating a lines file from the data, the conversion instruction data storage means, the data conversion calculation means for performing the data conversion processing, and the results obtained by the cutting plane calculation calculation means are used. And a drawing data creating / displaying means for laying out the data in an arbitrary drawing format, the drawing data storing means, and a calculating / displaying means for performing a drawing process using the drawing data. Item 1. A ship shape data creation device according to item 1. 3. The automatic round-and-tail rounding device is internally set while considering connection conditions based on data obtained by performing knuckle processing and fairing with a virtual width at the fore and aft ends of the hull. And a calculation / display means for automatically performing a rounding process using a function, a calculation / display means for controlling the degree of rounding using the automatically rounded data, and a rounded data storage means. The hull shape data creating device according to claim 1.