JP7531798B2 - FISHING GEAR SIMULATION DEVICE, FISHING GEAR SIMULATION SYSTEM, AND FISHING GEAR SIMULATION METHOD - Google Patents

Description

The present invention relates to fishing gear simulation technology that simulates the behavior of fishing gear.

Patent document 1 discloses a method for simulating net topography and fishing gear.

In the method described in Patent Document 1, mass points are set at the nodes and legs of the net using net conditions and environmental conditions related to the fluid, and an equation of motion for these mass points is set. In the method described in Patent Document 1, the behavior of the net is simulated by calculating this equation of motion.

Patent No. 3870359 specification

However, in the method described in Patent Document 1, the greater the number of mass points set in the net, the greater the computational load and the greater the computation time. In other words, when simulating a large-scale net or simulating to obtain highly accurate net behavior, the computation time increases significantly.

On the other hand, simply reducing the number of mass points set in the net will result in a decrease in the accuracy of the simulation results for the net's behavior.

Therefore, the object of the present invention is to provide a fishing gear simulation technology that can perform high-speed calculations while suppressing a decrease in the accuracy of the simulation results.

The fishing gear simulation device of the present invention includes a resolution determination unit and a simulation execution unit. The resolution determination unit determines a resolution model that sets the time resolution or area resolution within the fishing gear in the simulation based on the operating conditions determined by the type of fishing gear and the environment in which the fishing gear is placed. The simulation execution unit uses the resolution model to execute a simulation according to the resolution.

In this configuration, highly accurate simulation results can be obtained for time periods or areas where highly accurate simulation results are required depending on the operating conditions using fishing gear, while increases in calculation time are suppressed for other time periods or areas.

This invention makes it possible to perform high-speed calculations while minimizing the deterioration of the accuracy of the simulation results.

FIG. 1 is a diagram showing a schematic configuration of a fishing gear simulation system according to an embodiment of the present invention. FIG. 2 is a flowchart showing a main flow of a fishing gear simulation method according to an embodiment of the present invention. FIG. 3 is a flowchart showing the process of determining the resolution model. FIG. 4 is a diagram showing the relationship between the operational conditions using dynamic fishing gear and fishing method (operated fishing gear) and the resolution model. FIG. 5 is a diagram showing the relationship between the operation conditions using static fishing gear and fishing method (fixed fishing gear) and the resolution model. 6A, 6B, and 6C are diagrams showing an example of the distribution of low-resolution areas and high-resolution areas in the case of a purse seine. 7(A) and 7(B) are diagrams showing an example of the distribution of low-resolution areas and high-resolution areas in the case of bottom trawl. FIG. 8 is a diagram showing an example of the distribution of low-resolution areas and high-resolution areas in the case of a gill net. FIG. 9 is a diagram showing an example of the distribution of low-resolution areas and high-resolution areas in the case of a fixed net. FIG. 10 is a diagram showing an example of the distribution of low-resolution and high-resolution regions in the case of an aquaculture net. 11A, 11B, and 11C are graphs showing the change over time in the maximum mass point displacement amount. FIG. 12 is a diagram showing an example of setting mass points in a simulation in which the entire fishing gear is in low resolution. FIG. 13 is a diagram showing an example of setting mass points in a simulation in which the entire fishing gear is in high resolution. FIG. 14 is a diagram showing an example of setting mass points in a simulation in which low-resolution areas and high-resolution areas are mixed in a fishing gear. FIG. 15 is a flowchart showing the simulation execution process. FIG. 16 is a flow chart showing the process for switching from a low-resolution simulation to a high-resolution simulation. FIG. 17A is a flowchart showing a process when only a time element is used, and FIG. 17B is a flowchart showing a process when only a region element is used. FIG. 18 is a flowchart showing a process for performing a composite judgment.

The fishing gear simulation technology according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 is a diagram showing the schematic configuration of a fishing gear simulation system according to an embodiment of the present invention.

As shown in FIG. 1, the fishing gear simulation system 10 includes a simulation device 20, an information processing terminal 30, and a communication network 100. The simulation device 20 and the information processing terminal 30 are connected via the communication network 100. The simulation device 20 corresponds to the "fishing gear simulation device" of the present invention.

The communication network 100 may be a general-purpose network or a network configured specifically for this system.

(General configuration and processing of simulation device 20)
The simulation device 20 includes a data processing unit 21, an interface 22 (IF22 in FIG. 1 ), and a database 23 (DB23 in FIG. 1 ). The simulation device 20 is realized by, for example, a server device. Such a server device includes a computer having a higher data processing capability than the information processing terminal 30. The data processing unit 21 is connected to the interface 22 and the database 23.

The interface 22 connects to the interface 33 of the information processing terminal 30 via the communication network 100. The interface 22 receives the operating conditions from the information processing terminal 30 and outputs them to the data processing unit 21. The interface 22 also transmits the three-dimensional image generated by the data processing unit 21 to the interface 33 of the information processing terminal 30.

The database 23 stores the results of the simulations performed by the present invention, additional information obtained from these simulations, etc. The additional information includes tendencies of users who input the operations to perform the simulations, tendencies of specific designated information for each simulation, etc.

It is sufficient that the database 23 is capable of storing at least the simulation results. However, by storing additional information in the database 23, it becomes possible to realize a simulation that references past simulation results, thereby improving the accuracy of the simulation results in response to the user's requests.

(Overall configuration and processing of data processing unit 21)
The data processing unit 21 includes a resolution model determining unit 211 , a simulation executing unit 212 , and an image generating unit 213 .

Operational conditions are input to the resolution model determination unit 211 from the information processing terminal 30 via the communication network 100 and the interface 22. The operational conditions include the type of fishing method using the fishing gear for which a simulation is to be performed, parameters of the environment to be simulated by the simulation (the environment in which the fishing gear is placed), etc.

The resolution model determination unit 211 determines the resolution model to be used in the simulation based on the operating conditions. The resolution model sets the time resolution in the simulation or the area resolution within the fishing gear. That is, at least one of the time resolution and the area resolution is set in the resolution model. In the time resolution, high resolution time and low resolution time are set in a chronological order. In the area resolution, high resolution areas and low resolution areas are set for each area of the fishing gear. The resolution model determination unit 211 outputs the resolution model to the simulation execution unit 212.

The simulation execution unit 212 executes a simulation using the resolution model. The simulation execution unit 212 reads the settings of the time resolution and the area resolution from the resolution model. The simulation execution unit 212 executes a simulation according to the time resolution and the area resolution. The simulation execution unit 212 outputs the simulation result to the image generation unit 213.

In this way, by setting differences in resolution by time or area for the fishing gear simulation, it is possible to perform high-speed calculations for the entire simulation while suppressing a decrease in accuracy of the simulation results for the location or time period desired by the user. This allows the simulation device 20 to quickly calculate and provide to the user a fishing gear simulation with the accuracy desired by the user.

The image generation unit 213 generates a three-dimensional image of the fishing gear behavior from the simulation results. The image generation unit 213 outputs the three-dimensional image to the interface 22.

(General configuration and processing of information processing terminal 30)
The information processing terminal 30 includes a calculation unit 31, an operation input unit 32, an interface 33 (IF 33 in FIG. 1 ), and a display 34. The information processing terminal 30 is realized by a general-purpose personal computer, a tablet terminal, or the like.

The calculation unit 31 executes the overall control of the information processing terminal 30. The operation input unit 32 accepts input of operating conditions to be given to the simulation device 20. The operation input unit 32 outputs the input operating conditions to the calculation unit 31. The calculation unit 31 outputs an input support image of the operating conditions to the display 34. The calculation unit 31 also outputs the confirmed operating conditions to the interface 33.

The interface 33 is connected to the interface 22 of the simulation device 20 via the communication network 100. The interface 33 transmits the operating conditions from the calculation unit 31 to the interface 22 of the simulation device 20. The interface 33 also outputs the three-dimensional image from the simulation device 20 to the calculation unit 31.

The display 34 displays an input support image for the operating conditions from the calculation unit 31. The display 34 also displays a three-dimensional image from the calculation unit 31.

As described above, the simulation device 20 obtains simulation results with high resolution in the necessary areas (time periods, areas) and low resolution in other areas (time periods, areas). Therefore, the three-dimensional image also has high resolution in the necessary areas (time periods, areas) and low resolution in other areas (time periods, areas). In other words, the amount of data in the three-dimensional image required by the user is large, but the amount of data in other areas can be made small. Therefore, the three-dimensional image has a compressed overall data volume while achieving the accuracy desired by the user. This makes it possible to reduce the data communication load of the three-dimensional image on the communication network 100, and, for example, to more reliably transmit the three-dimensional image to the information processing terminal 30.

(Description of Processing in Data Processing Unit 21)
The processing executed by the data processing unit 21 will be described in more detail below with reference to FIGS.

(Main flow executed by data processing unit 21)
Fig. 2 is a flowchart showing a main flow of the fishing gear simulation method according to the embodiment of the present invention. As shown in Fig. 2, the data processing unit 21 of the simulation device 20 executes the following processes as the main flow. Note that in each process, the description of the parts already explained in the above description of the configuration (parts where the explanation is repeated) will be appropriately simplified or omitted below.

The resolution model determination unit 211 of the data processing unit 21 receives the operating conditions (S11). The resolution model determination unit 211 determines the resolution model from the operating conditions (S12).

The simulation execution unit 212 of the data processing unit 21 executes a simulation using the resolution model (S13). The image generation unit 213 of the data processing unit 21 generates and outputs a three-dimensional image of the fishing gear from the simulation results (S14).

(Decision process of resolution model)
FIG. 3 is a flowchart showing the process of determining the resolution model. FIG. 4 is a diagram showing the relationship between the operation conditions using dynamic fishing gear and fishing method (operated fishing gear) and the resolution model. FIG. 5 is a diagram showing the relationship between the operation conditions using static fishing gear and fishing method (fixed fishing gear) and the resolution model. FIG. 6(A), FIG. 6(B), and FIG. 6(C) are diagrams showing an example of the distribution of low-resolution areas and high-resolution areas in the case of purse seine. FIG. 6(A) shows the casting process, FIG. 6(B) shows the ring winding process, and FIG. 6(C) shows the hauling process. FIG. 7(A) and FIG. 7(B) are diagrams showing an example of the distribution of low-resolution areas and high-resolution areas in the case of bottom trawl. FIG. 7(A) shows the casting process, and FIG. 7(B) shows the slow winding process. FIG. 8 is a diagram showing an example of the distribution of low-resolution areas and high-resolution areas in the case of gill nets. FIG. 9 is a diagram showing an example of the distribution of low-resolution areas and high-resolution areas in the case of fixed nets. Fig. 10 is a diagram showing an example of the distribution of low-resolution and high-resolution regions in the case of an aquaculture net. Note that in Fig. 6(A), Fig. 6(B), Fig. 6(C), Fig. 7(A), Fig. 7(B), Fig. 8, Fig. 9, and Fig. 10, the high-resolution regions are hatched, and the low-resolution regions are not hatched. Note that the resolution can be set in a similar manner for other fishing gear and fishing methods not described in the following description.

The resolution model determination unit 211 analyzes the operation conditions (S21). More specifically, the resolution model determination unit 211 extracts the fishing gear and fishing method set in the operation conditions. For example, the resolution model determination unit 211 extracts, from the set operation conditions, purse seine, bottom trawl (turning type), bottom trawl (otter trawl, two-boat trawl), surface/mid-water trawl, gill net, fixed net, and aquaculture net, etc., as shown in Figures 4 and 5.

The resolution model determination unit 211 determines the time resolution and area resolution based on the extracted fishing gear and fishing method (S22). In other words, the data processing unit 21 determines the simulation resolution for each fishing method process (time element) and the simulation resolution for each area within the fishing gear (area element (position element)) according to the fishing gear and fishing method extracted as the operating conditions. At this time, the resolution model determination unit 211 can set different settings for dynamic fishing gear and fishing method (operated fishing gear) and static fishing gear and fishing method (fixed fishing gear).

(In the case of dynamic fishing gear and fishing method (operated fishing gear): see Figure 4, Figure 6 (A), Figure 6 (B), Figure 6 (C), Figure 7 (A), Figure 7 (B))
In the case of dynamic fishing gear and fishing method, the resolution model determination unit 211 determines the resolution model using the process (step) of the fishing method.

If the resolution model determination unit 211 extracts "purse seine" as a fishing gear or fishing method, it determines the resolution set for each process (step) of purse seine and the resolution set for each area in the fishing gear for purse seine. If the resolution model determination unit 211 extracts "bottom trawl (turning type)", it determines the resolution set for each process (step) of bottom trawl (turning type) and the resolution set for each area in the fishing gear for bottom trawl. If the resolution model determination unit 211 extracts "bottom trawl (otter trawl, two boats)", it determines the resolution set for each process (step) of bottom trawl (otter trawl, two boats) and the resolution set for each area in the fishing gear for bottom trawl. If the resolution model determination unit 211 extracts "surface/mid-water trawl", it determines the resolution set for each process (step) of surface/mid-water trawl and the resolution set for each area in the fishing gear for surface/mid-water trawl.

As a more specific example, the case where the fishing gear and fishing method are "purse seine" will be described with reference to Figs. 4, 6(A), 6(B), and 6(C). If the fishing gear and fishing method are "purse seine", the resolution model determination unit 211 sets the entire fishing gear to a low resolution in the net casting process (see Figs. 4 and 6(A)). In the net winding process, the resolution model determination unit 211 sets the main net part of the fishing gear (high resolution area ReC1 in Fig. 6(B)) to a high resolution and the other areas to a low resolution (see Figs. 4 and 6(B)). In the net hauling process, the resolution model determination unit 211 sets the fish catching part of the fishing gear (high resolution area ReC2 in Fig. 6(C)) to a high resolution and the other areas to a low resolution (see Figs. 4 and 6(C)).

The case where the fishing gear and fishing method are "bottom trawl (turning type)" will be explained with reference to Figures 4, 7(A), and 7(B). If the fishing gear and fishing method are "bottom trawl (turning type)", the resolution model determination unit 211 sets the entire fishing gear to low resolution from the net casting process to the net waiting process (see Figures 4 and 7(A)). From the net towing process to the winding (slow winding) process, the resolution model determination unit 211 sets the code end of the fishing gear (high resolution area ReC31 in Figure 7(B)) or the sleeve net (high resolution area ReC32 in Figure 7(B)) to high resolution, and sets the other areas to low resolution (see Figures 4 and 7(B)). From the winding (fast winding) process to the hauling process, the resolution model determination unit 211 sets the entire fishing gear to low resolution (see Figure 4).

The case where the fishing gear and fishing method are "bottom trawl (otter trawl, two boats)" will be explained with reference to Figure 4. If the fishing gear and fishing method are "bottom trawl (otter trawl, two boats)", the resolution model determination unit 211 sets the entire fishing gear to low resolution from the casting process to the bottom landing process (see Figure 4). The resolution model determination unit 211 sets the code end or sleeve net of the fishing gear to high resolution from the bottom landing process to the towing process, and sets other areas to low resolution (see Figure 4). The resolution model determination unit 211 sets the entire fishing gear to low resolution from the reeling process to the hauling process (see Figure 4).

The case where the fishing gear and fishing method are "surface/mid-water trawl" will be explained with reference to Figure 4. If the fishing gear and fishing method are "surface/mid-water trawl", the resolution model determination unit 211 sets the entire fishing gear to low resolution from the net casting process to the net towing (net sinking) process (see Figure 4). The resolution model determination unit 211 sets the code end or sleeve net of the fishing gear to high resolution and other areas to low resolution in the net towing (net depth stabilization) process (see Figure 4). The resolution model determination unit 211 sets the entire fishing gear to low resolution from the reeling process to the net hauling process (see Figure 4).

(In the case of static fishing gear and fishing methods (fixed fishing gear): see Figures 5, 8, 9, and 10)
In the case of static fishing gear and fishing method, the resolution model determination unit 211 determines the resolution model using the behavior of the fishing gear relative to the tides or waves in the environment in which the fishing gear is installed.

The case where the fishing gear and fishing method are "gill net" will be explained with reference to Figures 5 and 8. If the fishing gear and fishing method are "gill net", the resolution model determination unit 211 sets the entire fishing gear to low resolution during the period when the fishing gear is unsteady with respect to the tidal current or asynchronous with the waves (see Figure 5). During the period when the fishing gear is steady with respect to the tidal current and synchronous with the waves, the resolution model determination unit 211 sets the central part of the net of the fishing gear (high resolution area ReC4 in Figure 8) to high resolution and the other areas to low resolution (see Figures 5 and 8).

The case where the fishing gear and fishing method are "fixed net" will be explained with reference to Figures 5 and 9. If the fishing gear and fishing method are "fixed net", the resolution model determination unit 211 sets the entire fishing gear to low resolution during the period when the fishing gear is unsteady with respect to the tide or asynchronous with the waves (see Figure 5). During the period when the fishing gear is steady with respect to the tide and synchronous with the waves, the resolution model determination unit 211 sets the box net (high resolution area ReC51 in Figure 9), the ascending movement area (high resolution area ReC52 in Figure 9), or the fence net (high resolution area ReC53 in Figure 9) of the fishing gear to high resolution and sets the other areas to low resolution (see Figures 4 and 9).

The case where the fishing gear and fishing method are "aquaculture net" will be described with reference to Figures 5 and 10. If the fishing gear and fishing method are "aquaculture net", the resolution model determination unit 211 sets the entire fishing gear to low resolution during the period when the fishing gear is unsteady with respect to the tides or asynchronous with the waves (see Figure 5). During the period when the fishing gear is steady with respect to the tides and synchronous with the waves, the resolution model determination unit 211 sets one fish pen of the fishing gear (high resolution area ReC6 in Figure 10) to high resolution and the other areas to low resolution (see Figures 5 and 10).

The switching between a period (first period) in which the fishing gear is unsteady with respect to the tides or asynchronous with respect to the waves and a period (second period) in which the fishing gear is steady with respect to the tides and synchronous with respect to the waves can be determined, for example, as shown below. Figures 11(A), 11(B), and 11(C) are graphs showing the time change in maximum mass point displacement. Note that maximum mass point displacement means the maximum value in the displacement of multiple mass points that make up the fishing gear. The time changes in these maximum mass point displacements are set, for example, according to the environment in which the fishing gear is installed. The time changes in these maximum mass point displacements are stored, for example, in the data processing unit 21.

(Judgment on tides)
Fig. 11(A) shows the time variation of the maximum mass point displacement when the influence of the tidal current is taken into consideration, that is, Fig. 11(A) shows the case where only the tidal current acts on the fishing gear and there are no waves.

When fishing gear is unsteady relative to the tidal current, it is subjected to forces from the tidal current that cause displacement. Therefore, the fishing gear is more likely to displace, and the maximum mass point displacement is larger. When fishing gear is stationary relative to the tidal current, it is hardly subjected to forces from the tidal current that cause displacement. Therefore, the fishing gear is less likely to displace, and the maximum mass point displacement is smaller.

In addition, the fishing gear gradually transitions from an unsteady state to a steady state relative to the tidal current. For example, as shown in FIG. 11(A), as the fishing gear transitions from an unsteady state to a steady state relative to the tidal current, the maximum mass point displacement becomes smaller and converges to a small value.

Using this, the data processing unit 21 sets a threshold value THt for tidal currents for the maximum mass point displacement amount according to the environment in which the fishing gear is installed. The data processing unit 21 detects a switching time t1 (time elapsed from the start time of the simulation) at which the maximum mass point displacement amount becomes equal to or less than the threshold value THt for tidal currents. The data processing unit 21 provides the switching time t1 to the resolution model determination unit 211. The resolution model determination unit 211 uses the switching time t1 to switch between a period in which the fishing gear is unsteady relative to the tidal currents and a period in which the fishing gear is steady relative to the tidal currents.

(Judgment on waves)
Fig. 11(B) shows the time change of the maximum mass point displacement when the influence of waves is taken into consideration. Fig. 11(C) shows the time change of the moving average value of the maximum mass point displacement shown in Fig. 11(B).

When fishing gear is out of sync with the waves, it receives a force from the waves that causes a large displacement. Therefore, the gear is more likely to displace, and the maximum mass point displacement is larger. When fishing gear is in sync with the waves, it receives a force from the waves that causes a small displacement. Therefore, the gear is less likely to displace, and the maximum mass point displacement is smaller.

Furthermore, the fishing gear gradually transitions from an asynchronous state to a synchronous state with respect to the waves. For example, as shown in FIG. 11(B), as the fishing gear transitions from an asynchronous state to a synchronous state with respect to the waves, the maximum mass point displacement becomes smaller and converges to a small value. However, because waves are periodic, as shown in FIG. 11(B), the maximum mass point displacement converges to a small value overall, but increases or decreases locally.

Therefore, for ocean waves, the moving average value of the maximum mass point displacement is used. By using the moving average value, periodic noise is suppressed, as shown in FIG. 11(C). Note that, although the embodiment using the moving average value is shown here, calculations using other low-pass filters, band-rejection filters, etc. may also be used.

Using this, the data processing unit 21 sets a threshold value THw for waves for the maximum mass point displacement amount according to the environment in which the fishing gear is installed. The data processing unit 21 detects the switching time t2 (time elapsed from the start time of the simulation) at which the maximum mass point displacement amount becomes equal to or less than the threshold value THw for waves. The data processing unit 21 provides the switching time t2 to the resolution model determination unit 211. The resolution model determination unit 211 uses the switching time t2 to switch between a period in which the fishing gear is asynchronous with respect to the waves and a period in which the fishing gear is synchronous with respect to the waves.

From the above, the resolution model determination unit 211 determines that the period is the first period if the elapsed time is less than switching time t1 or less than switching time t2, and determines that the period is the second period if the elapsed time is equal to or greater than switching time t1 and equal to or greater than switching time t2.

The switching between the first and second periods can also be done using user settings.

(Simulation execution process)
Fig. 12 is a diagram showing an example of mass point setting in a simulation in which the entire fishing gear is in low resolution. Fig. 13 is a diagram showing an example of mass point setting in a simulation in which the entire fishing gear is in high resolution. Fig. 14 is a diagram showing an example of mass point setting in a simulation in which low resolution areas and high resolution areas are mixed in the fishing gear. Fig. 15 is a flowchart showing the execution process of the simulation.

As a general process, the simulation execution unit 212 sets multiple mass points on the fishing gear and simulates the behavior of the fishing gear by solving the equation of motion for the multiple mass points (more specifically, the three-dimensional coordinates of the mass points). Note that the setting and solving method of the equation of motion for multiple mass points are generally known settings and methods, and therefore a description is omitted. The low-resolution simulation and the high-resolution simulation differ in the number of multiple mass points set on the fishing gear and the spacing between the multiple mass points. Specifically, they are set as shown in Figures 12 and 13.

(For low resolution simulations)
As shown in Fig. 12, in the low-resolution simulation, a plurality of first mass points M are set for the fishing gear 90. The plurality of first mass points M are set at nodes arranged at a predetermined interval in a plurality of nodes (corresponding to second mass points m in the high-resolution simulation described below) of the fishing gear 90. For example, as shown by black circles in Fig. 12, the first mass points M are set at a predetermined number of nodes in the first direction (the horizontal direction in Fig. 12) and the second direction (the vertical direction in Fig. 12) of the fishing gear 90.

The first mass points M are assigned array numbers for a low-resolution simulation. For example, as shown in Fig. 12, array numbers are set such that, with a specific first mass point M( _A0 , _B0 ) as a reference, the number of A subscripts increases in the first direction and the number of B subscripts increases in the second direction. As a result, as shown in Fig. 12, the first mass points M are two-dimensionally arranged with respect to the fishing gear 90 (see the first mass points M( _A0 , _B0 ), first mass points M( _AII , _B0 ), first mass points M( _A0 , _BJJ ), first mass points M( _AII , _BJJ ), etc. in Fig. 12).

In this case, it is _preferable that the first mass points M adjacent to each other in the second direction have different positions in the first direction, as shown in Fig. 12 as the first mass points M( _A0 , _B0 ), M _{(A0 , B1} ), and M(A1, B0). Note that the setting of the multiple first mass points M is not limited to this and can be set appropriately.

When low resolution is set, the simulation execution unit 212 executes the simulation using these multiple first mass points M.

(For high resolution simulations)
13, in the high-resolution simulation, a plurality of second mass points m are set for the fishing gear 90. The plurality of second mass points m are set at a plurality of joints of the fishing gear 90. For example, as indicated by the black circles in FIG. 13, the second mass points m are set for all of the joints of the fishing gear 90.

The second mass point m is assigned an array number for a high-resolution simulation. For example, as shown in Fig. 13, the array numbers are set such that, with a specific second mass point m( _a0 , _b0 ) as a reference, the number of subscripts of a increases in the first direction and the number of subscripts of b increases in the second direction. As a result, as shown in Fig. 13, the second mass points m are two-dimensionally arranged with respect to the fishing gear 90 (see the second mass point m( _a0 , _b0 ), the second mass point m( _ai , _b0 ), the second mass point m( _a0 , _bj ), the second mass point m( _ai , _bj ), etc. in Fig. 13).

When high resolution is set, the simulation execution unit 212 executes the simulation using these multiple second mass points m.

The second mass point m and the first mass point M are associated with each other if they are located at the same position on the fishing gear 90. For example, in the examples of Fig. 12 and Fig. 13, the second mass point m ( _a0 , _b0 ) and the first mass point M ( _A0 , _B0 ) are set to represent the same mass point, and the second mass point m ( _ai , _bj ) and the first mass point M ( _AII , _BJJ ) are set to represent the same mass point.

(When low-resolution and high-resolution simulations are mixed)
14, when a low-resolution simulation and a high-resolution simulation are mixed, the simulation execution unit 212 executes a simulation using the above-mentioned second mass point m for the region ReC where the high-resolution simulation is set. The simulation execution unit 212 executes a simulation using the above-mentioned first mass point M for the region where the low-resolution simulation is set, in other words, for the region other than ReC where the high-resolution simulation is set.

(Simulation execution flow: see FIG. 15)
When the simulation execution unit 212 receives the resolution model from the resolution model determination unit 211, it sets a simulation initial value (S31). For example, if the initial value is a low resolution overall, the simulation initial value is set using the above-mentioned multiple first mass points M. In addition, the simulation execution unit 212 acquires the time and area for executing the low-resolution simulation and the time and area for executing the high-resolution simulation from the resolution model.

The simulation execution unit 212 executes a simulation to estimate and calculate the position of the mass point at a predetermined time interval. If the time for which the position of the mass point is estimated and calculated is not a time of interest (S32: NO), the simulation execution unit 212 executes the above-mentioned low-resolution simulation for the entire fishing gear 90. The time of interest is a time during which a high-resolution simulation set by the resolution model is adopted for at least a part of the fishing gear 90.

If it is the time of interest (S32: YES) and the area of interest (S34: YES), the simulation execution unit 212 executes the above-mentioned high-resolution simulation for the area of interest (S36). The area of interest is an area for which a high-resolution simulation set by a resolution model is adopted. Whether or not a mass point is in the area of interest is set by the above-mentioned array number. Therefore, by using the array number of each mass point, it is possible to determine whether the mass point is inside or outside the area of interest.

If the area is not of interest (S34: NO), the simulation execution unit 212 executes the above-mentioned low-resolution simulation even if it is the time of interest (S35).

The simulation execution unit 212 combines the high-resolution simulation results and the low-resolution simulation results for the same time period (S37).

The simulation execution unit 212 sequentially outputs the simulation results obtained at each timing (S38).

The simulation execution unit 212 executes the above-mentioned simulation sequentially until a simulation end trigger is obtained (S39: NO). When a simulation end trigger is obtained (S39: YES), the simulation execution unit 212 ends the simulation. The end trigger is set, for example, based on the set fishing gear, the timing when all processes in the fishing method are completed, the timing when an operation to end the simulation is received from the user, etc.

In the above flow, the simulation execution unit 212 outputs the simulation results each time a simulation result is obtained at each timing. However, the simulation execution unit 212 may output the simulation results together after the simulation ends at the set end timing.

By employing such processing, the data processing unit 21 of the simulation device 20 can obtain highly accurate simulation results for areas and time periods (processes) where highly accurate behavior of the fishing gear 90 is desired. Furthermore, the data processing unit 21 of the simulation device 20 can perform simulations at high speed for areas and time periods (processes) where highly accurate behavior is not required. This allows the simulation device 20 to perform high-speed calculations while suppressing a decrease in the accuracy of the simulation results.

(Processing when switching between low-resolution and high-resolution simulations)
The above process requires switching from a low-resolution simulation to a high-resolution simulation and vice versa. The low-resolution and high-resolution simulations have some mass points in common, but there are also mass points that exist only in the high-resolution simulation.

In such a case, for example, you can use the following method to run a simulation after the switch using the simulation results before the switch.

(When switching from a high-resolution simulation to a low-resolution simulation)
The simulation execution unit 212 uses mass points that exist in both the high-resolution simulation and the low-resolution simulation. Specifically, when the simulation execution unit 212 detects switching from high resolution to low resolution, it takes over the simulation results at mass points that exist in both simulations (the first mass point M and the second mass point m that are set at the same position on the fishing gear 90). Then, the simulation execution unit 212 switches from the high-resolution simulation to the low-resolution simulation.

(When switching from a low-resolution simulation to a high-resolution simulation)
The simulation execution unit 212 sets a plurality of second mass points m that are not set in the low-resolution simulation, and sets the initial values of the plurality of second mass points m. Specifically, the simulation execution unit 212 calculates the initial value of the second mass point m to be set this time for high resolution, using the simulation results of a plurality of first mass points M arranged at positions surrounding the second mass point m. For example, in the example of FIG. 14, the initial value of the second mass point m (a _ix , b _iy ) in the region ReCC where the new high-resolution simulation is performed is calculated using the simulation results of the first mass points M (A _{I ,} B ₀ ), M (A _IF , B _JF ), M (A _I , B _J ), and M (A _IE , B _JF ) surrounding the second mass point m (a _ix , b iy ). The calculation of this initial value can be realized, for example, by using linear interpolation of the simulation results of each first mass point M.

The interpolation of the simulation results is not limited to linear interpolation. For example, the force related to the region ReCC is estimated from the direction of the tide or waves included in the parameters of the environment in the operating conditions, more specifically, the magnitude and direction of the tide or waves colliding with the region ReCC including the second mass point m(a _ix , b _iy ). The force related to the region ReCC may be estimated using both the tide and the waves. Then, the direction in which the region ReCC moves may be estimated based on the estimated force, and curved surface interpolation may be performed taking into account the estimated direction. For the curved surface interpolation, for example, spline interpolation, Bezier interpolation, etc. may be used.

Figure 16 is a flowchart showing the process for switching from a low-resolution simulation to a high-resolution simulation.

The simulation execution unit 212 sets a mass point (second mass point m) to be calculated (S361). The simulation execution unit 212 detects whether or not the set mass point has data (simulation results) from the immediately preceding time. Specifically, it detects whether or not a first mass point M is set at the same position as the set second mass point m.

If there is data on the immediately preceding calculation timing executed in the low-resolution simulation (S362: YES), the simulation execution unit 212 uses the data on the immediately preceding calculation timing (simulation result) as the initial value of the high-resolution simulation at that mass point (S363). If there is no data on the immediately preceding calculation timing executed in the low-resolution simulation (S362: NO), the simulation execution unit 212 calculates the initial value using data on the neighboring mass point (first mass point M) (S364). Once the initial value is set, the simulation execution unit 212 executes the high-resolution simulation (S365). The neighboring mass point is, for example, a plurality of first mass points M surrounding the second mass point m, or a first mass point M adjacent to the second mass point m, as described above.

By performing such processing, it is possible to ensure continuity in the simulation results of each mass point in the low-resolution simulation and the high-resolution simulation, and to suppress discontinuity. This allows the simulation device 20 to realize a simulation with reduced error.

In the above description, the simulation device sets the simulation resolution using both time and area elements. However, the simulation device can also set the simulation resolution using only time elements, only area elements, or a combination of factors. FIG. 17(A) is a flowchart showing the process when only time elements are used, and FIG. 17(B) is a flowchart showing the process when only area elements are used. FIG. 18 is a flowchart showing the process when a combination of factors is used. The specific content of each process shown in FIG. 17(A), FIG. 17(B), and FIG. 18 is the same as that described above, and explanations will be omitted except for points that require new explanation.

As shown in FIG. 17(A), when only time elements are used, the simulation device analyzes the operating conditions (S21) and determines the time resolution for the simulation (S22A). As shown in FIG. 17(B), when only area elements are used, the simulation device analyzes the operating conditions (S21) and determines the area resolution for the simulation (S22B).

As shown in FIG. 18, when selectively using a mode that uses only time-based resolution, a mode that uses only area-based resolution, and a mode that uses both time-based resolution and area-based resolution, the simulation device analyzes the operating conditions (S21) and sets a resolution model (S231).

If the simulation device is set to use only time elements (S232: time only), it determines only the time resolution for the simulation (S22A). If the simulation device is set to use only area elements (S232: area only), it determines only the area resolution for the simulation (S22B). If the simulation device is set to use both time elements and area elements (S232: time and area), it determines the time resolution and area resolution for the simulation (S22).

In addition, the above explanation shows a configuration in which mass points are arranged in a planar structure, but the above configuration and processing can also be applied to a configuration in which mass points are arranged in a three-dimensional structure, such as a bottom trawl.

The above-mentioned resolution model can be confirmed on the information processing terminal 30, and the settings can be changed from the information processing terminal 30. In this case, the data processing unit 21 provides the determined resolution model to the information processing terminal 30 via the interface 22 and the communication network 100. The information processing terminal 30 returns the resolution model whose settings have been changed by the user to the resolution model determination unit 211 via the communication network 100 and the interface 22. In this way, by making it possible to change the resolution model, it is possible to execute a simulation that more accurately reflects the user's requests.

In addition, in the above-described configuration and processing, the resolution is set to two levels. However, it is also possible to set the resolution to three or more levels. By increasing the number of resolution levels, the accuracy and speed of the simulation can be set in more detail. On the other hand, by reducing the number of resolution levels, the program configuration of the simulation can be simplified.

In the above description, the simulation device transmits a three-dimensional image to an information processing terminal. However, the simulation device may transmit a simulation result to the information processing terminal.

Furthermore, the above description does not state the specific timing for transmitting the three-dimensional image or the simulation results to the information processing terminal. The three-dimensional image or the simulation results may be transmitted to the information processing terminal when a request for the simulation is made and the simulation is completed, or may be transmitted after a separate request for the simulation results is received from the information processing terminal.

10: Fishing gear simulation system 20: Simulation device 21: Data processing unit 22: Interface 23: Database 30: Information processing terminal 31: Calculation unit 32: Operation input unit 33: Interface 34: Display 90: Fishing gear 100: Communication network 211: Resolution model determination unit 212: Simulation execution unit 213: Image generation unit M: First mass point m: Second mass point

Claims (14)

A resolution determination unit that determines a resolution model that sets a time resolution in a simulation or a region resolution within the fishing gear based on operation conditions including a type of fishing gear;
a simulation execution unit that executes a simulation according to the resolution by using the resolution model;
Equipped with
The resolution determination unit is
The method of determining the resolution model is different depending on whether the fishing method is a dynamic fishing gear or a fishing method using an operational fishing gear or a static fishing gear or a fishing method using a fixed fishing gear.
Fishing gear simulation device. The resolution determination unit is
The operating conditions include an environment in which the fishing gear is placed to determine the resolution model.
The fishing gear simulation device according to claim 1. the resolution determination unit uses the resolution model in which both the time-based resolution and the area-based resolution are set;
The fishing gear simulation device according to claim 1 or 2. The simulation execution unit includes:
When a low resolution is set, the number of the first mass points used in the simulation is set to a first number, and the interval between the first mass points is set to a first interval;
When high resolution is set, the number of the second mass points used in the simulation is set to a second number, and the interval between the second mass points is set to a second interval;
the second number is greater than the first number, and the second interval is less than the first interval;
The fishing gear simulation device according to any one of claims 1 to 3. The simulation execution unit includes:
When the low resolution is switched to the high resolution,
The plurality of first mass points are respectively replaced with second mass points;
A second mass point used only in the high-resolution simulation is set using a plurality of first mass points adjacent to the second mass point or a plurality of first mass points surrounding the second mass point;
The fishing gear simulation device according to claim 4. The simulation execution unit is
an interpolated value of a simulation result of the plurality of first mass points used in the low-resolution simulation is used as an initial value of a second mass point used in the high-resolution simulation;
The fishing gear simulation device according to claim 5. The simulation execution unit is
Setting an initial value of the second mass point using surface interpolation with reference to parameters of tides or waves in the environment in which the fishing gear is placed;
The fishing gear simulation device according to claim 6. The resolution determination unit is
In the case of the dynamic fishing gear or fishing method, the process of the fishing method is used to determine the resolution model.
The fishing gear simulation device according to any one of claims 1 to 7 . The resolution determination unit is
In the case of the static fishing gear or fishing method, the resolution model is determined using the behavior of the fishing gear relative to the tides or waves of the environment in which the fishing gear is installed.
The fishing gear simulation device according to any one of claims 1 to 7 . An image generating unit that generates a three-dimensional image of the behavior of the fishing gear using the result of the simulation.
The fishing gear simulation device according to any one of claims 1 to 9 . The fishing gear simulation device according to claim 10 ;
an information processing terminal that provides the fishing gear simulation device with the type of fishing gear and the environment in which the fishing gear is placed, and receives a three-dimensional image of the behavior of the fishing gear;
a communication network connecting the fishing gear simulation device and the information processing terminal;
A fishing gear simulation system comprising: A resolution model for setting a time resolution in the simulation or a region resolution within the fishing gear is determined based on the operation conditions including the type of fishing gear , depending on whether the fishing gear is a dynamic fishing gear or a static fishing gear or a static fishing gear or a static fishing gear or a static fishing gear or a static fishing method using a fixed fishing gear ;
Using the resolution model, a simulation is performed according to the resolution.
A fishing gear simulation method in which the processing is carried out by a computer. The operating conditions include an environment in which the fishing gear is placed to determine the resolution model.
A fishing gear simulation method according to claim 12 . Executing the simulation using the resolution model in which both the time resolution and the area resolution are set.
A fishing gear simulation method according to claim 12 or 13 .

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