KR20230001116A - Apparatus and method for virtual assembly simulation of propeller and shaft for ship - Google Patents

Abstract

Disclosed are a virtual assembly simulation apparatus for a shaft and a propeller for a ship and a method thereof, which can minimize the actual number of assembly times and the actual number of machining times of a real shaft and a real propeller. The virtual assembly simulation apparatus comprises: a shape reconstruction part using point cloud data generated by scanning a real shaft and a real propeller to generate a shaft object and a propeller object which are virtual objects; and a simulation part performing a virtual assembly simulation in which the shaft object is inserted into a virtual fastening groove formed on the propeller object to a limit depth, and generating machining target information based on plastic deformation of a protruding portion formed on at least one between an outer circumferential surface of the shaft object and an inner circumferential surface of the first fastening groove resulting from the insertion of the shaft object and contact information between the inner circumferential surface and the outer circumferential surface.

Description

Apparatus and method for virtual assembly simulation of propeller and shaft for ship}

The present invention relates to a virtual assembly simulation apparatus and method for a propeller and a shaft for a ship.

A ship is provided with a propeller that propels the ship by converting power of a propulsion engine transmitted through a shaft into thrust.

A fastening groove for inserting and coupling a shaft is formed in the body of the propeller, and an inner circumferential surface of the fastening groove and an outer circumferential surface of the coupling portion of the shaft are inclined in a tapered shape so as to correspond to each other.

In order to effectively transmit the rotational force of the shaft to the propeller, the outer circumferential surface of the shaft and the inner circumferential surface of the fastening groove of the propeller are precisely machined to have a sufficient contact area with each other.

In order to ensure that the shaft and the propeller can be assembled while having a sufficient contact area, conventionally, a method of assembling, separating, calculating and processing a real shaft and a real propeller is repeated until the target value of the contact ratio is satisfied. was used

However, the process of repeatedly assembling and separating the real shaft and the real propeller until the target value of the contact ratio is satisfied is not only a very cumbersome task, but also requires a lot of work time.

In addition, since the scope and amount of processing work for the real shaft and the real propeller are determined by the operator's empirical judgment, there is a limit in that the contact area between the real shaft and the real propeller cannot be accurately determined and precisely processed.

In addition, since the processing of the mutual contact area is not precise, there is also a problem that the process of assembling and separating the real shaft and the real propeller must be repeated several times.

Korean Patent Registration No. 10-1882081 Korean Patent Publication No. 10-2015-0133926

According to the present invention, through assembly simulation using a shaft object and a propeller object, it is possible to obtain processing information on an area to be processed that satisfies the contact ratio and the amount of processing, thereby minimizing the actual number of assembly and processing of a real shaft and a real propeller. It is to provide a virtual assembly simulation device and method of a propeller and shaft for a ship that can do.

Other objects of the present invention will be readily understood through the following description.

According to one aspect of the present invention, a shape restoration unit for generating a shaft object and a propeller object, which are virtual objects, using point cloud data generated by scanning a real shaft and a real propeller, respectively; and performing a virtual assembly simulation in which the shaft object is inserted into a virtual fastening groove formed in the propeller object to a limit depth, formed on at least one of an inner circumferential surface of the virtual fastening groove and an outer circumferential surface of the shaft object according to the insertion of the shaft object. A virtual assembly simulation apparatus for a propeller and a shaft for a ship including a simulation unit generating information on a target to be processed based on plastic deformation of a protrusion and contact information between the inner circumferential surface and the outer circumferential surface is provided.

The shaft object and the propeller object may be created in a corresponding truncated cone shape, respectively, and the propeller object may be created in a hollow truncated cone shape to form the virtual fastening groove.

Information on a series of processes in which the shaft object located above the virtual fastening groove is adjusted to the optimal position and posture for entering the virtual fastening groove is a process of entering the real shaft into the fastening groove formed in the real propeller. It can be generated with contact simulation information that is reference information of .

The virtual assembly simulation device, when the contact ratio between the shaft object and the propeller object according to the contact information does not satisfy a pre-specified target value, is input by referring to the processing target information and color distribution chart to satisfy the target value The virtual processing unit may further include a virtual processing unit that generates processing information about a region to be processed and a processing amount for at least one of an outer circumferential surface of the actual shaft and an inner circumferential surface of the fastening groove of the actual propeller, using the temporary processing information.

The virtual processing unit modifies the shaft object and the propeller object to be virtually processed using the processing information, and the simulation unit performs virtual assembly simulation using the modified shaft object and the propeller object to obtain processing target information and contact information. can be recreated.

The shape restoration unit regenerates a shaft object and a propeller object, which are virtual objects, using point cloud data generated by scanning a real shaft and a real propeller processed using the processing information, and the simulation unit regenerates the shaft object and the propeller object. By performing a virtual assembly simulation using the propeller object, processing target information and contact information may be regenerated.

The processing information may be generated to include one or more of a processing amount setting for one or more protrusions having a plastic deformation amount exceeding a predetermined reference value, and a tapered angle adjustment setting of one or more of a truncated cone-shaped propeller object and a shaft object. .

According to another aspect of the present invention, a computer program stored in a computer-readable medium for performing a method of simulating a virtual assembly of a propeller and a shaft for a ship, wherein the computer program causes a computer to perform the following steps, the steps , (a) generating a shaft object and a propeller object, which are virtual objects, using point cloud data generated by scanning a real shaft and a real propeller, respectively; (b) at least one of an inner circumferential surface of the virtual fastening groove and an outer circumferential surface of the shaft object according to the insertion of the shaft object while performing a virtual assembly simulation in which the shaft object is inserted to a limit depth into the virtual fastening groove formed in the propeller object generating processing object information based on plastic deformation of the protruding portion formed on and contact information between the inner circumferential surface and the outer circumferential surface; (c) determining whether a contact ratio between the shaft object and the propeller object according to the contact information satisfies a predetermined target value; and (d) if the target value is not satisfied, the outer circumferential surface of the actual shaft and the inner circumferential surface of the fastening groove of the actual propeller are obtained by using temporary processing information input with reference to the processing object information and the color distribution chart to satisfy the target value. A computer program stored in a computer-readable medium is provided, including the step of generating processing information about a region to be processed and a processing amount for one or more of the above.

The computer program may further include (e) generating a modified shaft object and a propeller object by virtual processing using the processing information, and the above (b) to the above for the modified shaft object and propeller object. (e) may be performed again.

The computer program may perform steps (a) to (d) again for the real shaft and the real propeller processed using the processing information.

Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims and detailed description of the invention.

According to an embodiment of the present invention, through assembly simulation using a shaft object and a propeller object, it is possible to secure processing information on a target area to be processed and a processing amount that satisfies the contact ratio, and thus the actual number of assembly times of the actual shaft and the actual propeller. and has the effect of minimizing the number of processing times.

1 is a view for explaining a contact test process between a shaft and a propeller according to the prior art.
2 is a schematic block diagram of an assembly simulation device for virtual assembly of a propeller and a shaft for a ship according to an embodiment of the present invention.
3 is a diagram illustrating a process of generating a shaft object and a propeller object by a shape restoration unit according to an embodiment of the present invention.
4 to 7 are views for explaining a virtual assembly simulation of a simulation unit according to an embodiment of the present invention.
8 is a diagram illustrating a virtual processing technique by a virtual processing unit according to an embodiment of the present invention.
9 is a flowchart illustrating a method for simulating a virtual assembly of a propeller and a shaft for a ship according to an embodiment of the present invention.
10 is a flowchart illustrating a method for simulating a virtual assembly of a propeller and a shaft for a ship according to another embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

In addition, in the description with reference to the accompanying drawings, the same or related reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. The accompanying drawings are somewhat exaggerated for convenience of explanation and understanding, and it is natural that the present invention is not limited to the size of each component shown in the accompanying drawings.

1 is a view for explaining a contact test process between a shaft and a propeller according to the prior art.

Referring to FIG. 1, the prior art contact test between the shaft and the propeller starts with a vertical lifting operation by fastening a jig to the actual shaft in order to move the actual shaft having a weight of about 50 tons (step 110). .

Subsequently, blue ink is applied to the lower area of the vertically lifted actual shaft (ie, the insertion area inserted into the fastening groove formed in the actual propeller) (step 120).

Then, after the lower region of the real shaft is inserted into the fastening groove of the real propeller, the real shaft is separated from the real propeller again (steps 130 and 140).

When the lower area of the real shaft coated with blue ink is inserted into the fastening groove of the real propeller and separated again, the blue ink on the outer circumference of the lower area of the real shaft that is in contact with the inner circumferential surface of the fastening groove of the real propeller is wiped off. and the blue ink of the uncontacted part of the inner circumferential surface of the fastening groove is maintained.

Therefore, the contact ratio between the real shaft and the real propeller can be calculated by calculating the area area of the area where the applied blue ink is erased.

If the contact ratio calculated in this way does not satisfy a predetermined target value (for example, the contact area is 80% or more of the total area), processing information (e.g., For example, an area to be processed and an amount to be processed) are determined (step 150).

In this case, processing information that is a standard for local grinding of the inner circumferential surface of the fastening groove of the propeller or lathe processing of the shaft is entirely determined by an operator's empirical judgment.

According to the processing information determined as described above, the outer circumferential surface of the lower region of the actual shaft and/or the inner circumferential surface of the fastening groove of the propeller are processed (step 160).

Thereafter, the above-described steps 120 to 160 are repeatedly performed until the contact ratio between the outer circumferential surface of the lower region of the actual shaft and the inner circumferential surface of the fastening groove of the propeller satisfies a predetermined target value.

In this way, the shaft and propeller contact test according to the prior art consists of repeating the process of assembling and separating the real shaft and the real propeller until the target value of the contact ratio is satisfied, and also processing the contact part as a target. . However, such repetitive work is not only very cumbersome, but also requires a lot of work time.

2 is a schematic block diagram of an assembly simulation device for virtual assembly of a propeller and a shaft for a ship according to an embodiment of the present invention, and FIG. 3 is a shaft object and a propeller object by a shape restoration unit according to an embodiment of the present invention. It is a diagram showing the process of generating. 4 to 7 are diagrams for explaining a virtual assembly simulation of a simulation unit according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating a virtual processing technique by a virtual processing unit according to an embodiment of the present invention. .

Referring to FIG. 2, the assembly simulation device 210 for virtual assembly of a ship propeller and a shaft includes an input unit 211, a storage unit 213, a shape restoration unit 215, a simulation unit 217, and a virtual processing unit ( 219) and a control unit 221.

Here, each detailed component of the assembly simulation device 210 may be configured as a kind of module that performs a designated role. Here, the module may be implemented in a software form, implemented in a hardware configuration such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), or a combination thereof. Of course, a module is not limited to software or hardware, and may be configured to reside in an addressable storage medium or configured to execute one or more processors. Functionality provided in components and modules may be combined into fewer components and modules or further separated into additional components and modules.

The input unit 211 receives 3D scan data generated by scanning each of the manufactured real shaft and the real propeller by the 3D scanner 230 and stores it in the storage unit 213 .

The 3D scan data stored in the storage unit 213 may be point cloud data corresponding to each of the real shaft and the real propeller.

Here, the point cloud data may be generated for the entire area of the real propeller and the real shaft, but at least the lower area of the real shaft including the inner circumferential area of the fastening groove of the real propeller and the insertion area to be inserted into the fastening groove, which is the region of interest, is included. can be created so that

For example, the point cloud data is obtained by repeatedly firing a laser to obtain shape information on the outer circumferential surface of the lower region of the real shaft and the inner circumferential surface of the propeller fastening groove, which are regions of interest, and three points for each point on the inner circumferential surface. It can be dimensional coordinates.

A target (not shown) may be attached to one or more positions of the outer circumferential surface of the real shaft to be scanned by the 3D scanner 230 and the body surface of the propeller or the fastening groove. For example, the target may be attached to a predetermined position to designate a reference point to be described later, that is, an alignment criterion for virtually assembling the shaft object 320 and the propeller object 310 . The target may be formed of a magnetic material so as to be magnetically attached to the surface of the real metal shaft and the real propeller.

The shape restoration unit 215 is a virtual object corresponding to the real propeller in which fastening grooves are formed using each of the first point cloud data 305 and the second point cloud data 315 stored in the storage unit 213 after the real propeller is scanned. The propeller object 310 and the shaft object 320, which is a virtual object corresponding to the real shaft, are respectively created.

The shape restoration unit 215 may generate a propeller object 310 and a shaft object 320 having full shapes corresponding to the real propeller and the real shaft by using point cloud data that is 3D scan data.

Alternatively, the shape restoration unit 215 may create the propeller object 310 and the shaft object 320 restored around the region of interest, as illustrated in FIG. 3 . In this case, the propeller object 310 may be created in the shape of a hollow truncated cone surrounding the periphery of the hollow virtual fastening groove to correspond to the shape of the inner circumferential surface of the fastening groove of the real propeller. In addition, the shaft object 320 may be created in a truncated cone shape corresponding to the outer circumferential shape of the lower region of the actual shaft including at least an insertion region inserted into the virtual fastening groove.

Each of the propeller object 310 and the shaft object 320 may be formed in a tapered truncated cone shape in which the diameter becomes relatively small as it moves downward. A virtual fastening groove corresponding to the length of the fastening groove formed in the real propeller is formed in the propeller object 310, and the length of the shaft object 320 may be relatively longer than the length of the virtual fastening groove.

The shape restoration unit 215 recognizes tags attached to pre-designated positions of the real shaft and the real propeller from 3D scan data, and uses them as reference points for each shaft object 320 and propeller object 310 for alignment with each other. can be set

The simulation unit 217 performs a virtual assembly simulation in which the shaft object 320 is inserted into the virtual fastening groove of the propeller object 310 .

As illustrated in FIG. 4 , the simulation unit 217 aligns the shaft object 320 and the propeller object 310 using reference points respectively set, and then the shaft object 320 is aligned with the inner groove of the propeller object 310. A virtual assembly simulation may be performed by moving the shaft object 320 in a direction to be inserted into the shaft.

At this time, the simulation unit 217 maintains the shape of the propeller object 310 created in the tapered truncated cone shape without being deformed, the propeller only up to the limit depth into which the shaft object 320 created in the tapered truncated cone shape can enter. A limiting condition for moving the shaft object 320 to be inserted into the virtual fastening groove of the object 310 is applied.

Here, the movement of the shaft object 320 may be automatically performed by the simulation unit 217 applying the above-described limiting conditions in response to a user's assembly simulation start command, but a control window (see FIG. 5) or operation set by the user in advance. The shaft object 320 may be moved and manipulated using a means.

For example, the user may move or rotate the shaft object 320 up and down, left and right, by using a shaft movement menu, a shaft axis rotation menu, and the like provided in the control window. As another method, the user may horizontally move or rotate the shaft object 320 in a drag-and-loop manner using an operating means such as a mouse device or a stylus pen.

In order for the real shaft to effectively enter the fastening groove of the real propeller, the real shaft needs to be arranged so that the central axes of the real shaft and the fastening groove coincide with each other above the fastening groove.

The simulation unit 217 may virtually simulate a series of processes of adjusting the real shaft to an optimal entry position and attitude so that the real shaft is inserted into the fastening groove of the real propeller.

That is, after positioning the shaft object 320 on top of the propeller object 310, in order to match the central axes of the virtual fastening grooves of the shaft object 320 and the propeller object 310 with each other (see (c) in FIG. 6). , The simulation unit 217 rotates the shaft object 320, for example, based on a point on the lower surface of the shaft object 320 (see FIG. 6 (a)) or manipulates horizontal movement (FIG. 6 of (b)).

Information on a series of processes in which the shaft object 320 disposed on top of the virtual fastening groove is adjusted to the optimal position and posture for entering the virtual fastening groove of the propeller object 310 (ie, contact simulation information) is stored. Then, it can be used as information for adjusting the optimal entry position and posture for inserting the real shaft (see step 110 in FIG. 1) fixed to the jig into the fastening groove of the real propeller.

Thereafter, the simulation unit 217 performs a virtual assembly simulation in which the shaft object 320 adjusted to the optimal entry position and attitude is moved and entered into the virtual fastening groove of the propeller object 310 .

As illustrated in FIG. 7 , plastic deformation may occur in one or more of the protrusions 710 present on the outer circumferential surface of the shaft object 320 while the shaft object 320 enters the virtual fastening groove. . That is, the protruding portion 710 existing on the outer circumferential surface of the shaft object 320 in contact with the body of the propeller object 310 may be plastically deformed while being crushed by the weight of the shaft object 320 . Here, the protruding portion 710 of the shaft object 320 corresponds to an insufficiently processed portion existing on the outer circumferential surface of the actual shaft. Similarly, the protruding portion 710 may exist on the inner circumferential surface of the propeller object 310, which corresponds to an insufficiently processed portion present on the inner circumferential surface of the actual propeller.

The simulation unit 217 recognizes positional information and plastic deformation amount of a protrusion where plastic deformation occurs during the virtual assembly process of the shaft object 320 and the propeller object 310 . The amount of plastic deformation may be set in advance as, for example, an area crushed by plastic deformation, a deformed protrusion height of the protruding portion 710 by plastic deformation, and the like.

The simulation unit 217 classifies the protruding portion 710 where the amount of plastic deformation is less than a predetermined reference value (for example, 5 micrometers) as a penetration position allowing plastic deformation. It may be set in advance to generate processing target information including location information of the corresponding protruding part. That is, the processing target information is for the protruding parts 710 whose plastic deformation exceeds the reference value during the process of inserting the shaft object 320 into the virtual fastening groove of the propeller object 310 to the limit depth according to the predetermined limiting condition. can be created The processing object information generated by this process may be used for actual processing of the outer circumferential surface of the actual shaft, as will be described later.

The simulation unit 217 simulates the shaft object 320 and the propeller object 310 in a state in which the protrusion 710 is plastically deformed and the shaft object 320 is inserted to the limit depth in the virtual fastening groove of the propeller object 310. A contact ratio between the terminals is calculated, and a determination result as to whether or not the calculated contact ratio satisfies a predetermined target value is generated.

The contact strength between the outer circumferential portion of the shaft object 320 and the corresponding inner circumferential portion of the propeller object 310 may be expressed in the form of a color distribution diagram as illustrated in FIG. 4(b).

Referring to the color distribution diagram illustrated in (b) of FIG. 4, for example, as the color of each corresponding position progresses from green to blue, it means a relatively strong contact strength, and as it progresses from green to red, each corresponding It can be expressed to indicate a state in which the separation distance of the location is large. Therefore, the area expressed from green to blue is the area where the shaft object 320 and the propeller object 310 are in contact, and when the area of the area expressed in the corresponding color is calculated, the contact area and the contact ratio (ie, contact area / total area * 100%) can be calculated. Calculation of the contact area and contact ratio may be performed using, for example, the contact area calculation menu of the control window.

If the calculated contact ratio satisfies a pre-specified target value (for example, a contact ratio of 80% or more), the actual shaft is inserted into the fastening groove of the actual propeller without additional processing of the protrusions 710 included in the processing target information. Even if inserted, it can be expected that the real shaft and the real propeller will be coupled to each other while having a sufficient contact area. Therefore, assembling the real shaft and the real propeller may be completed by adjusting the real shaft to the optimal insertion position and posture to correspond to the above-described contact simulation information and then inserting the real shaft into the fastening groove of the real propeller.

However, if the calculated contact ratio does not satisfy a predetermined target value, the virtual processing unit 219 (see FIG. 2 ) may generate processing information on a target area to be processed and a processing amount.

The processing information may be generated targeting a region having a relatively high contact strength due to the existence of the protruding portion 710 . In this case, the location of the region to be machined may refer to information on the location of the protruding part included in the information to be processed generated in the assembly simulation process.

For example, when the user adjusts the amount of processing (for example, the amount of grinding to be processed) for the protruding part 710 at the position indicated in dark blue on the color distribution chart as the area with the greatest contact strength using the control window. , The virtual processing unit 219 changes the contact strength of the corresponding area relatively small, and as a result, the contact strength of other areas also changes. That is, when the relatively protruding position is ground and the contact strength is reduced, the contact strength of the other relatively protruding position becomes stronger, and the previously marked non-contact area can be changed to a new contact area. .

As a form of generating processing information, as illustrated in FIG. 8 , the protruding portion 710 is processed to increase the contact ratio between the shaft object 320 and the propeller object 310 (see FIG. 8 (a)). ), and the shape of adjusting the tapered angle of the shaft object 320 and/or the propeller object 310 (see (b) of FIG. 8).

As described above, when the contact strength of each area and the distribution of the contact area are changed, the simulation unit 217 updates information about the contact area and contact ratio between the shaft object 320 and the propeller object 310 .

If the updated contact ratio satisfies a predetermined target value, the real shaft and/or the real propeller are processed to correspond to the processing information generated by the virtual processing unit 219, and then the real shaft is inserted into the fastening groove of the real propeller. assembly can be completed.

As another example, before performing the actual assembly process using the real shaft and the real propeller, the virtual processing unit 219 reflects the processing information of the shaft object 320 and the propeller object 310 to form a virtually processed shape. You can precede the process of editing with . The simulation unit 217 may perform a virtual assembly simulation for the virtually processed shaft object 320 and the propeller object 310, and if it is confirmed that the contact ratio satisfies a predetermined target value through this, processing information is displayed. Referring to, after the real shaft and/or the real propeller are processed, the assembly work of the real shaft and the real propeller may be performed.

Referring back to FIG. 2 , the control unit 221 controls operations of the aforementioned input unit 211 and shape restoration unit 215 .

9 is a flowchart illustrating a virtual assembly simulation method of a propeller and a shaft for a ship according to an embodiment of the present invention.

Referring to FIG. 9 , in step 910, the assembly simulation device 210 receives 3D scan data (eg, point cloud data) generated by scanning each of the fabricated real shaft and real propeller.

In step 920, the assembly simulation device 210 uses the input 3D scan data to generate a propeller object 310, which is a virtual object corresponding to a real propeller having a fastening groove, and a shaft object 320, which is a virtual object corresponding to a real shaft. create each

For example, the propeller object 310 may be created in the shape of a hollow truncated cone surrounding the periphery of a hollow virtual fastening groove to correspond to the shape of the inner circumferential surface of the fastening groove of the real propeller, and the shaft object 320 may be created in the shape of a virtual cone. It may be formed in a truncated cone shape corresponding to the outer circumferential shape of the lower region of the actual shaft including at least the insertion region inserted into the fastening groove.

In step 930, the assembly simulation device 210 performs a virtual simulation of virtually assembling the shaft object 320 and the propeller object 310 to generate processing target information and contact information.

The assembly simulation device 210 places the shaft object 320 on top of the virtual fastening groove formed in the propeller object 310, and then moves the shaft object 320 inside the virtual fastening groove through rotation manipulation and/or horizontal movement manipulation. Contact simulation to adjust to the optimal entry position and attitude to enter can be performed first. The contact simulation information generated in the contact simulation process can be used to adjust the real shaft to be inserted into the fastening groove of the real propeller to the optimal entry position and attitude.

Thereafter, the assembly simulation device 210 enters the shaft object 320 into the virtual fastening groove and inserts it to the limit depth, the outer circumferential surface of the shaft object 320 and/or the inner circumferential surface of the virtual fastening groove of the propeller object 310. By recognizing the positional information and plastic deformation amount of the protruding portion 710 present in , processing object information corresponding thereto is generated. In this case, it may be set in advance to generate the processing target information only for the protruding portion in which the amount of plastic deformation exceeds a predetermined reference value.

Thereafter, the assembly simulation device 210 performs plastic deformation of the protruding portion 710 and when the shaft object 320 is inserted to the limit depth in the virtual fastening groove of the propeller object 310, the shaft object 320 and the propeller object 310 ) Calculate the contact area and contact ratio between

In step 940, the assembly simulation device 210 determines whether the calculated contact ratio between the outer circumferential surface of the shaft object 320 and the inner circumferential surface of the virtual fastening groove of the propeller object 310 satisfies a predetermined target value.

If the calculated contact ratio satisfies a predetermined target value, in step 950, the assembly simulation device 210 generates assembly information for actually assembling the real shaft and the real propeller. The assembly information may include, for example, contact simulation information for adjusting the actual shaft to an optimal insertion position and angle.

However, if the calculated contact ratio does not satisfy the predetermined target value, in step 960, the assembly simulation device 210 increases the contact ratio to process the real shaft and/or the real propeller to satisfy the predetermined reference value. generate information

The processing information may be generated by referring to, for example, a color distribution diagram indicating contact strength between corresponding regions of the virtual shaft and the virtual propeller and processing target information generated in a virtual simulation process.

For example, the processing information targets a region in which the contact strength is relatively high due to the presence of the protruding portion 710 in the color distribution map, and the location of the area to be processed is based on location information of the protruding portion included in the processing target information. can be specified using Alternatively, if the region in which the contact strength is relatively large does not have a relationship with the protruding portion 710, the processing information may be generated to adjust the tapered angle of the shaft object 320 and/or the propeller object 310. there is.

In order to ensure that the contact ratio between the propeller object 310 and the shaft object 320 satisfies the reference value, the user refers to, for example, processing target information and color distribution, and uses a control window or the like to determine one or more protrusions ( 710), processing temporary information can be input in various cases such as adjusting the tapered angle. Each time processing temporary information is input, the contact area and contact ratio may be preset to be updated and presented to the user.

When a contact ratio satisfying a predetermined reference value is presented, the user may request generation of processing information, and the assembly simulation device 210 may generate processing information using temporary processing information input by the user. there is.

When the real shaft and/or the real propeller are re-processed according to the generated processing information (step 970), the process starts again from step 910 in which each of the re-machined real shaft and real propeller is re-scanned and the generated 3D scan data is input.

The aforementioned steps 920 to 940 are performed again, and if a contact ratio equal to or greater than a predetermined target value is satisfied, assembly information is generated (step 950), and a real shaft and a real propeller are assembled to correspond to the assembly information.

However, if the contact ratio still does not satisfy the predetermined target value, processing information is regenerated in step 960 to re-process the actual shaft and/or the actual propeller (step 970), and then the process starts again from step 910.

10 is a flowchart illustrating a method for simulating a virtual assembly of a propeller and a shaft for a ship according to another embodiment of the present invention.

Unlike the virtual assembly simulation method described above with reference to FIG. 9 , FIG. 10 has a difference in that a shaft object and/or a propeller object are modified to be virtually processed using the processing information generated in step 960 .

That is, as a result of the determination in step 940, if the calculated contact ratio does not satisfy the predetermined target value, the assembly simulation device 210 provides processing information for processing the actual shaft and/or the actual propeller to increase the contact ratio. generate

Subsequently, in step 1010, the assembly simulation device 210 modifies the shaft object 320 and the propeller object 310 generated in step 920 into a virtually processed form corresponding to the processing information. For example, when processing information is generated to process a protruding part 710 at a specific location by a specific machining amount, the corresponding protruding part 710 is virtually processed by the corresponding machining amount, and the shaft object 320 and/or The propeller object 310 is modified.

Next, in step 930, the assembly simulation device 210 performs a virtual simulation of virtually assembling the modified shaft object 320 and the propeller object 310 to generate processing target information and contact information.

In step 940, the assembly simulation device 210 determines whether the calculated contact ratio between the outer circumferential surface of the shaft object 320 and the inner circumferential surface of the virtual fastening groove of the propeller object 310 satisfies a predetermined target value.

If the calculated contact ratio satisfies a predetermined target value, in step 950, the assembly simulation device 210 generates assembly information for actually assembling the real shaft and the real propeller. The assembly information may include, for example, contact simulation information for adjusting the actual shaft to an optimal insertion position and angle, and processing information generated in step 960 for processing the actual shaft and/or the actual propeller.

However, if the calculated contact ratio does not satisfy the predetermined target value, in step 960, the assembly simulation device 210 processes the shaft object 320 and/or the propeller object 310 to increase the contact ratio. generate information Thereafter, it proceeds again from step 1010 described above.

As described above, the virtual assembly simulation apparatus and method of the ship propeller and shaft according to the present embodiment secures processing information on the processing target area and processing amount satisfying the contact ratio through assembly simulation using the shaft object and the propeller object. Therefore, it has the advantage of minimizing the actual number of assembly and processing of the real shaft and the real propeller.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art will variously modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. And it will be understood that it can be changed.

210: assembly simulation device 211: input unit
213: storage unit 215: shape restoration unit
217: simulation unit 219: virtual processing unit
221: control unit 230: 3D scanner
305, 315: point cloud data 310: propeller object
320: shaft object 710: protrusion part

Claims (8)

a shape restoration unit that creates a shaft object and a propeller object, which are virtual objects, using point cloud data generated by scanning a real shaft and a real propeller; and
A virtual assembly simulation is performed to insert the shaft object into a virtual fastening groove formed on the propeller object to a limit depth, and a protrusion formed on at least one of an inner circumferential surface of the virtual fastening groove and an outer circumferential surface of the shaft object according to the insertion of the shaft object. A virtual assembly simulation device for a propeller and shaft for a ship, comprising a simulation unit for generating processing target information based on plastic deformation of a part and contact information between the inner circumferential surface and the outer circumferential surface. According to claim 1,
When the contact ratio between the shaft object and the propeller object according to the contact information does not satisfy a predetermined target value,
An area to be processed and an amount to be processed for at least one of the outer circumferential surface of the real shaft and the inner circumferential surface of the fastening groove of the real propeller by using temporary processing information input with reference to the processing target information and color distribution chart to satisfy the target value. Further comprising a virtual processing unit for generating processing information about, the virtual assembly simulation device of the propeller and shaft for ships. According to claim 2,
The virtual processing unit modifies the shaft object and the propeller object to be virtually processed using the processing information, and the simulation unit performs virtual assembly simulation using the modified shaft object and the propeller object to obtain processing target information and contact information. A virtual assembly simulation device for regenerating propellers and shafts for ships. According to claim 2,
The shape restoration unit regenerates a shaft object and a propeller object, which are virtual objects, using point cloud data generated by scanning a real shaft and a real propeller processed using the processing information, and the simulation unit regenerates the shaft object and the propeller object. A virtual assembly simulation device for a propeller and a shaft for a ship, which performs virtual assembly simulation using the propeller object to regenerate processing target information and contact information. According to claim 2,
The processing information is generated to include one or more of a processing amount setting for one or more protruding portions having a plastic deformation amount exceeding a predetermined reference value, and one or more tapered angle adjustment settings of a truncated cone-shaped propeller object and a shaft object. A virtual assembly simulation device for propellers and shafts. A computer program stored in a computer-readable medium for performing a method of simulating a virtual assembly of a propeller and a shaft for a ship, the computer program causing a computer to perform the following steps, the steps comprising:
(a) generating a shaft object and a propeller object, which are virtual objects, using point cloud data generated by scanning a real shaft and a real propeller, respectively;
(b) at least one of an inner circumferential surface of the virtual fastening groove and an outer circumferential surface of the shaft object according to the insertion of the shaft object while performing a virtual assembly simulation in which the shaft object is inserted to a limit depth into the virtual fastening groove formed in the propeller object generating processing object information based on plastic deformation of the protruding portion formed on and contact information between the inner circumferential surface and the outer circumferential surface;
(c) determining whether a contact ratio between the shaft object and the propeller object according to the contact information satisfies a predetermined target value; and
(d) If the target value is not satisfied, the outer circumferential surface of the real shaft and the inner circumferential surface of the fastening groove of the real propeller are obtained by using the processing temporary information input with reference to the processing object information and the color distribution chart so as to satisfy the target value. A computer program stored in a computer-readable medium comprising the step of generating processing information about processing target areas and processing amounts for one or more. According to claim 6,
(e) further comprising generating a shaft object and a propeller object modified by virtual processing using the processing information;
A computer program stored in a computer-readable medium, wherein (b) to (e) are performed again for the modified shaft object and propeller object. According to claim 6,
A computer program stored in a computer-readable medium, wherein the steps (a) to (d) are performed again for the real shaft and the real propeller processed using the processing information.

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