Marine steel plate standard plate width calculation method and related product

Abstract

The invention relates to the technical field of marine steel plates, in particular to a marine steel plate standard plate width calculation method and related products. A total price mathematical model is established, and a calculation process is optimized by using a total price change value updating model, so that the total price change rate after each standard board width is deleted can be quickly calculated, and a total price change rate-standard board width number curve is drawn. And according to the curve, a standard plate width combination near the target percentage can be rapidly determined, namely the required standard plate width. Therefore, the whole process of calculating the width of the standard board consumes less time. And meanwhile, the theoretical cost obtained by calculating the cost of the standard board width is not greatly improved compared with the original cost, and the theoretical cost is close to the optimal board width combination.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship steel plate, in particular to a ship steel plate standard plate width calculation method and related products. BACKGROUND

[0002] In the process of ship design, after the hull modeling and nesting are completed, a steel plate order list is formed for steel procurement. The steel plant will mark up the price of each plate according to the plate thickness, material and width of the steel plate. At present, there are many specifications of ordered steel plates, with an average of about 2000 per ship. With the increase in the number of ships under construction, it will cause a series of problems such as difficulty in ordering, difficulty in arranging production lines, and difficulty in inventory management. Therefore, it is an important topic to standardize the steel plate specifications of multiple ship types to reduce the number of steel plate specifications. The thickness and material standardization is relatively convenient, that is, the steel plates with less thickness and material are increased by the principle of not reducing the strength, and the total number of the combination of thickness and material is less. The principle of width standardization is to increase the plate width without changing the length, so that the number of plates with the same thickness and material is reduced, and the standard plate width is determined according to the plate width distribution.

[0003] The problems of width standardization are as follows: first, the width range is large and the types are many, usually between 1500mm and 4500mm; second, the mark-up changes with the width, which is a piecewise function. If the manual unified plate width method is adopted, it will be time-consuming and laborious, and it is difficult to get the optimal combination. Therefore, automatic calculation of standard plate width is considered. A simple method is to directly use the enumeration method, for example, 1500mm~4500mm (interval 10mm), 25 standard plate widths, which need to be enumerated nearly 300^25 times. Moreover, the total number of suitable standard plate widths also needs to be calculated, which further increases the number of enumerations and makes the calculation of standard plate width time-consuming. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a ship steel plate standard plate width calculation method and related products, which can solve the problem of time-consuming automatic calculation of standard plate width in the prior art.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a ship steel plate standard plate width calculation method, which comprises:

[0006] Step S1, constructing a total price mathematical model after steel plate width standardization, wherein the steel plate width standardization refers to the standardization of all original plate widths to a plurality of preset standard plate widths, and the number of standard plate widths is less than the number of original plate widths;

[0007] Step S2, constructing a total price change model after deleting one of the standard plate widths according to the total price mathematical model;

[0008] Step S3, according to the total price change model, respectively calculate the total price change value corresponding to deleting one of the standard plate width, and determine the current minimum value in each total price change value combination, delete the standard plate width corresponding to the current minimum value; wherein the maximum standard plate width does not participate in judging the current minimum value in each total price change value combination; when multiple current minimum values appear at the same time, only the minimum standard plate width in each standard plate width corresponding to multiple current minimum values is deleted.

[0009] Step S4, according to the total price change model, derive the total price change value update model of the standard plate width adjacent to the deleted standard plate width;

[0010] Step S5, according to the total price change value update model, update the total price change value of the standard plate width adjacent to the deleted standard plate width, and delete the current minimum value to update each total price change value combination, determine the new minimum value in each total price change value combination based on the updated total price change value combination, and delete the standard plate width corresponding to the new minimum value;

[0011] Step S6, repeat steps S3 and S5 until only the maximum standard plate width is left.

[0012] Step S7, record the deleted standard plate width, and calculate the total price change rate after deleting each standard plate width;

[0013] Step S8, according to the total price change rate and the corresponding standard plate width, draw the total price change rate-standard plate width curve.

[0014] Step S9, determine the standard plate width combination near the target percentage through the curve.

[0015] Optionally, the steel plate width includes:

[0016] Divide all the original plate widths into multiple plate width intervals according to a preset interval;

[0017] Take the upper limit of each plate width interval as the standard plate width after the original plate width is uniformly widened in each plate width interval.

[0018] Optionally, the total number of remaining standard plate widths in step S6 is 2, that is, in addition to the maximum standard plate width, there is only one standard plate width left.

[0019] Optionally, the total price mathematical model is:

[0020]

[0021] wherein, indicates that all original plate widths h are uniformly widened to the price at the time, denotes the corresponding width premium coefficient;

[0022] all original plates with a width h are unified to a width of the price at the time is:

[0023]

[0024] wherein N is the total number of plates, which is a constant, is the proportion of the number corresponding to the original plate width h less than the standard plate width, is the average length corresponding to the original plate width h less than the standard plate width.

[0025] Optionally, the total price change model after deleting one of the standard plate widths is:

[0026]

[0027] wherein, , , denotes the current standard plate width order, if the deleted is the current standard plate width the total price change model at this time is relatively special, which can be expressed as .

[0028] Optionally, the total price change value update model of the standard plate width adjacent to the deleted standard plate width is:

[0029]

[0030] wherein, denotes the current standard plate width order, if the current minimum value corresponding to the standard plate width is the current standard plate width , then the total price change value corresponding to the current standard plate width is updated, a special formula is used.

[0031] Optionally, the total price change rate after deleting each of the standard plate widths is calculated respectively, including:

[0032] According to the total price mathematical model, the initial total price T0 is calculated;

[0033] The total price change rate is:

[0034]

[0035] Wherein, T represents the total price of the steel plate after deleting the corresponding standard plate width, represents the current minimum value.

[0036] Optionally, after updating the total price change value of the adjacent standard plate width , the method further comprises deleting the standard plate width , .

[0037] The application further provides a machine readable storage medium, which stores a machine executable program, and the machine executable program is executed by a processor to realize the ship steel plate standard plate width calculation method.

[0038] The application further provides a computer device, which comprises a memory, a processor, and a machine executable program stored in the memory and running on the processor, and the processor executes the machine executable program to realize the ship steel plate standard plate width calculation method.

[0039] In the ship steel plate standard plate width calculation method, the calculation process is optimized by establishing a total price mathematical model and updating the model by using the total price change value, so that the total price change rate after deleting each standard plate width can be quickly calculated, and then a total price change rate-standard plate number curve is drawn. According to the curve, the standard plate width combination near the target percentage can be quickly determined, that is, the required standard plate width. Then the whole process of calculating the standard plate width takes less time. At the same time, the theoretical cost obtained by calculating the cost of the calculated standard plate width is not much higher than the original cost, which is a nearly optimal plate width combination. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a ship steel plate standard plate width calculation method flow chart of an embodiment of the application;

[0041] Figure 2 is a total price change rate-standard plate number curve diagram of an embodiment of the application;

[0042] Figure 3 is a schematic diagram of a machine readable storage medium according to an embodiment of the application;

[0043] Figure 4 is a schematic diagram of a computer device according to an embodiment of the application. DETAILED DESCRIPTION

[0044] The following refers to Figures 1-4A method for calculating standard plate width of a marine steel plate and related products are described.

[0045] As shown in Figure 1 , the embodiment of the present application provides a method for calculating standard plate width of a marine steel plate, the calculation method comprising:

[0046] Step S1, constructing a total price mathematical model of the steel plate after unifying the width. The steel plate width unification refers to unifying all original plate widths to a plurality of preset standard plate widths. The number of standard plate widths is less than the number of original plate widths. The steel plate is unified in width first, and then the total price mathematical model is constructed, which simplifies the complexity of the mathematical model, improves the calculation accuracy and efficiency.

[0047] Further, the total price mathematical model is:

[0048]

[0049] Wherein, represents the price of the steel plate with all original plate widths h unified to , represents the corresponding width price coefficient, which can be obtained according to Table 1 steel plate width thickness price table. Table 1 Steel plate width thickness price table

[0050]

[0051]

[0052] The price of the steel plate with all original plate widths h unified to is:

[0053]

[0054] Wherein, N is the total number of plates, which is a constant, is the proportion of the number of original plate widths h less than the standard plate width , is the average length of the original plate width h less than the standard plate width .

[0055] Specifically, the proportion of the number of original plate widths h less than the standard plate width , the average length of the original plate width h less than the standard plate width , the width price coefficient corresponding to the standard plate width , and the total number of plates N are obtained.

[0056] ​The original plate width h < the standard plate width H is unified to H, and the price of the steel plate is:

[0057]

[0058] Assuming that there are two adjacent standard plate widths H1 and H2, the price of the steel plate between H1 and H2 when unified to H2 is:

[0059]

[0060] Further, the total price mathematical model can be derived as:

[0061]

[0062] Further, the steel plate is unified in width, including:

[0063] All original plate widths are divided into multiple plate width intervals according to a preset interval;

[0064] The upper limit of each plate width interval is used as the standard plate width after the original plate width in the plate width interval is unified.

[0065] Specifically, the preset interval of the plate width interval can be set as needed, which can be 10 mm, 5 mm or 15 mm. Taking a certain specification of steel plate with a width of 1500 mm to 4500 mm as an example, the plate width interval is divided by a preset interval of 10 mm, and the plate width interval is [1500, 1510], [1510, 1520], [1520, 1530]……, and the unified plate width is 1510 mm, 1520 mm, 1530 mm…….

[0066] Further, after calculating all values, the values can be directly used for calculation to avoid repeated calculation of the cost of each steel plate, thereby reducing the total calculation times and saving time.

[0067] Step S2, according to the total price mathematical model, a total price change model after deleting one of the standard plate widths H is constructed.

[0068] Further, for convenience of expression, the is directly used, the is used to represent , and is defined. Wherein, represents the current standard plate width order. The total price mathematical model is:

[0069]

[0070] ​​​So, the total price change model after deleting the standard board width is:

[0071]

[0072] It should be noted that if the deleted is the current standard board width , the total price change model at this time is relatively special, which can be expressed as .

[0073] Step S3, according to the total price change model, the total price change value corresponding to each of the standard board width is calculated respectively after deleting one of them, and the current minimum value in each total price change value combination is determined , and the standard board width corresponding to the current minimum value is deleted.

[0074] Further, the maximum standard board width does not participate in the judgment of the current minimum value in each total price change value combination. That is, the maximum standard board width is not deleted, and the maximum standard board width is not considered when judging the minimum value of each total price change value. Since the maximum standard board width is the "final bottom" of all original board widths, the maximum original board width can only be unified to the maximum standard board width. If the maximum standard board width is included in the judgment and is deleted by mistake, this part of the original board width will not be able to be unified, resulting in an error in the entire unified plan.

[0075] In addition, when there are multiple 0s in each total price change value, multiple current minimum values may appear at the same time , at this time only the minimum standard board width in each standard board width corresponding to the multiple current minimum values is deleted. This is based on two reasons, one is that smaller standard board widths have a greater impact on the overall value calculation, so deleting smaller standard board widths can make the impact of such changes more timely reflected in the calculation. The second is to consider a region where the board width increases and the price decreases, deleting smaller standard board widths can make this part of the standard board width as close to the optimal solution as possible.

[0076] Step S4, according to the total price change model, the total price change value update model of the standard board width adjacent to the deleted standard board width is derived.

[0077] Further, according to the total price change model, the total price change value is only related to the deleted standard board width and the standard board width adjacent to the deleted standard board width . Therefore, after deleting the standard board width each time, only the total price change value of the adjacent standard board width needs to be updated. At this time, the standard board width The total price change value updating model of the adjacent standard board width is:

[0078]

[0079]

[0080] wherein, represents the current standard board width sequence.

[0081] Further, if the current minimum value corresponds to the standard board width is the current standard board width , only the total price change value corresponding to the current standard board width needs to be updated. If the current minimum value corresponds to the standard board width is the current standard board width , the total price change value corresponding to the current standard board width is updated by using a special formula . Since the maximum standard board width cannot be deleted, the standard board width is actually the point to be deleted. If the standard board width is deleted, the total price change value corresponding to the standard board width is updated as follows:

[0082]

[0083] Step S5: According to the total price change value updating model, the total price change values of the standard board widths adjacent to the deleted standard board width are updated, and the current minimum value is deleted to update each total price change value combination. Based on the updated each total price change value combination, a new minimum value in each total price change value combination is determined, and the standard board width corresponding to the new minimum value is deleted.

[0084] Further, after updating the total price change values of the standard board widths adjacent to the deleted standard board width , the corresponding , , of the deleted standard board width are deleted, so as to avoid the interference of invalid parameters on subsequent calculation.

[0085] Step S6: Steps S3 and S5 are repeated until only the maximum standard board width is left. At this time, the total number of remaining standard board widths is 1.

[0086] Further, the remaining standard plate width total number in step S6 is 2, that is, in addition to the maximum standard plate width, there is one standard plate width left. , not only retains the production and calculation simplicity, but also avoids the high loss and high cost problem of single plate width through complementary specifications, which is more suitable for the needs of actual large-scale production.

[0087] Step S7, record the deleted standard plate width, and calculate the total price change rate after deleting each standard plate width respectively.

[0088] Further, the total price change rate after deleting each standard plate width is calculated respectively, including:

[0089] According to the total price mathematical model, the initial total price T0 is calculated;

[0090] The total price change rate is:

[0091]

[0092] Wherein, T represents the total price of the steel plate after deleting the corresponding standard plate width, represents the current minimum value.

[0093] Step S8, according to the total price change rate and the corresponding standard plate width, the total price change rate-standard plate number curve is drawn, as shown in Figure 2 , each curve represents a specification of steel plate.

[0094] Step S9, determine the standard plate width combination near the target percentage through the curve. The determination of the target percentage needs to consider the actual demand and feasibility. Optionally, the target percentage is 1%.

[0095] In summary, the application optimizes the calculation process by establishing a total price mathematical model and updating the model with total price change value, so as to quickly calculate the total price change rate after deleting each standard plate width, and then draw the total price change rate-standard plate number curve. According to the curve, the standard plate width combination near the target percentage can be quickly determined, that is, the required standard plate width. Further, the whole process of calculating the standard plate width takes less time. At the same time, the theoretical cost of the calculated standard plate width is not much higher than the original cost, which is the nearly optimal plate width combination.

[0096] Reference Figure 3 The application also provides a machine readable storage medium 400, which stores a machine executable program 410. The machine executable program 410 is executed by the processor to realize the ship plate standard plate width calculation method in the above embodiment.

[0097] Reference Figure 4The application further provides a computer device 500, comprising a memory 520, a processor 510, and a machine executable program 410 stored in the memory and running on the processor. The processor 510 implements the ship plate standard plate width calculation method in the above embodiment when executing the machine executable program 410.

[0098] For the description of the present embodiment, the machine readable storage medium 400 can be any device that can contain, store, communicate, propagate or transport programs for use by or in connection with an instruction execution system, apparatus or device. More specific examples (non-exhaustive list) of the machine readable storage medium 400 include the following: electrical connections having one or more wires (electronic devices), portable computer diskette (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read-only memory (CD ROM). In addition, the machine readable storage medium 400 can even be paper or other suitable medium on which the program is printed, as the program can be electronically obtained, for example by optical scanning of the paper or other medium, followed by electronic conversion of the optical scanning into an electronically available form, and then stored in computer memory.

[0099] It should be understood that parts of the present application can be realized in hardware, software, firmware or a combination thereof. In the above embodiment, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system.

[0100] The computer device 500 can be, for example, a server, a desktop computer, a notebook computer, a tablet computer or a smart phone. In some examples, the computer device 500 can be a cloud computing node. The computer device 500 can be described in the general context of computer system executable instructions, such as program modules, executed by the computer system. Generally, program modules can include routines, programs, objects, components, logic, data structures, etc. that perform particular tasks or implement particular abstract data types. The computer device 500 can be implemented in a distributed cloud computing environment in which tasks are performed by remote processing devices that are linked through a communication network. In a distributed cloud computing environment, program modules can be located in local or remote computer system storage media including storage devices.

[0101] The computer device 500 can include a processor 510 adapted to execute instructions stored in memory 520, which in this example is on the same compute device 500. The processor 510 can be a single-core processor, multi-core processor, computing cluster, or any number of other configurations. The memory 520 can include random access memory (RAM), read only memory (ROM), flash memory, or any other suitable memory systems.

[0102] The processor 510 can be connected through a system interconnect (e.g., a PCI, PCI-Express, or other interconnect) to an I / O interface adapted to connect the computer device 500 to one or more I / O devices (input / output devices). The I / O devices can include, for example, a keyboard and a pointing device, where the pointing device can include a touchpad or touchscreen, among others. The I / O devices can be built-in components of the computer device 500, or can be devices externally connected to the computer device.

[0103] The processor 510 can also be linked through the system interconnect to a display interface adapted to connect the computer device 500 to a display device. The display device can include a display screen that is a built-in component of the computer device 500. The display device can also include a computer monitor, television, or projector, among others, that is externally connected to the computer device 500. In addition, a network interface controller (NIC) can be adapted to connect the computer device 500 to a network through the system interconnect. In some embodiments, the NIC can use any suitable interface or protocol (such as Internet Small Computer Systems Interface, among others) to transfer data. The network can be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN), or the Internet, among others. Remote devices can be connected to the computer device through the network.

[0104] The above-described embodiments are merely illustrative for the principles of the present application and the efficacy thereof, and are not intended to limit the present application. Any modification or change to the above-described embodiments, which do not depart from the spirit and scope of the present application, can be made by any person skilled in the art. Therefore, all such equivalent modifications or changes, which are completed by those skilled in the art without departing from the spirit and technical idea of the present application, shall be covered by the claims of the present application.

Claims

1. A method of calculating a standard plate width of a marine steel plate, characterized by, The calculation method comprises: Step S1, constructing a total price mathematical model of steel plate unified width, the steel plate unified width refers to unifying all original plate widths to a plurality of preset standard plate widths, wherein the number of the standard plate widths is less than the number of the original plate widths; Step S2, constructing a total price change model after deleting one of the standard plate widths according to the total price mathematical model; Step S3, calculating each total price change value after deleting one of the standard plate widths respectively according to the total price change model, determining a current minimum value in each total price change value combination, and deleting the standard plate width corresponding to the current minimum value; wherein the maximum standard plate width does not participate in determining the current minimum value in each total price change value combination; when a plurality of current minimum values appear at the same time, only the minimum standard plate width corresponding to the plurality of current minimum values is deleted; Step S4, deriving a total price change value update model of the standard plate width adjacent to the deleted standard plate width according to the total price change model; Step S5, updating the total price change value of the standard plate width adjacent to the deleted standard plate width according to the total price change value update model, deleting the current minimum value, and updating each total price change value combination, determining a new minimum value in each total price change value combination based on the updated each total price change value combination, and deleting the standard plate width corresponding to the new minimum value; Step S6, repeating steps S3 and S5 until only the maximum standard plate width is left. Step S7, recording the deleted standard plate widths, and calculating the total price change rate after deleting each standard plate width respectively; Step S8, drawing a total price change rate-standard plate width curve according to the total price change rate and the corresponding standard plate width. Step S9, determining the standard plate width combination near the target percentage through the curve.

2. The method of calculating a standard plate width of a marine steel plate according to claim 1, characterized by, The steel plate unified width comprises: Dividing all the original plate widths into a plurality of plate width intervals according to a preset interval; Taking the upper limit of each plate width interval as the standard plate width after unifying each original plate width in the plate width interval.

3. The method for calculating the standard width of marine steel plates according to claim 1, characterized in that, The total number of remaining standard plate widths in step S6 is 2, that is, in addition to the maximum standard plate width, there is only one standard plate width left.

4. The method for calculating the standard width of marine steel plates according to claim 1, characterized in that, The total price mathematical model is: wherein, represents the price of all original steel plates having a width h standardized to a width of h represents the price of all original steel plates having a width h represents the price of all original steel plates having a width h corresponding width premium factor; All original plates with h < standard plate width are unified to the price of the plate with h = standard plate width Wherein, N is the total number of plates, is a constant, is the proportion of the number corresponding to the original plate width h less than the standard plate width , is the average length corresponding to the original plate width h less than the standard plate width .

5. The method of calculating a standard plate width of a marine steel plate according to claim 4, characterized by, The total price change model after deleting one of the standard plate widths is: wherein, , , represents the current standard board width order, if the deleted is the current standard board width , the total price change model at this time relatively special, can be expressed as .

6. The method of calculating a standard plate width of a marine steel plate according to claim 5, characterized in that, The total price change value update model of the standard board width adjacent to the deleted standard board width is: wherein, represents the current standard board width order, if the current minimum value corresponding to the standard board width is the current standard board width , then the current standard board width is updated corresponding to the total price change value, a special formula is used 7. The method of calculating a standard plate width of a marine steel plate according to claim 5, characterized by, The calculation of the total price change rate after deleting each standard plate width respectively comprises: Calculating an initial total price T0 according to the total price mathematical model; The total price change rate is: Wherein, T represents the total price of the steel plate after deleting the corresponding standard plate width, represents the current minimum value.

8. The method of calculating a standard plate width of a marine steel plate according to claim 6, characterized by, In the update and delete the said standard board width The total price change value of the adjacent said standard board width after, also including the said standard board width of the delete Corresponding , Delete.

9. A machine-readable storage medium, characterized in that, A machine executable program is stored thereon, and the machine executable program is executed by the processor to implement the ship plate standard plate width calculation method of any one of claims 1-8.

10. A computer device, comprising: The memory, the processor, and a machine executable program stored on the memory and running on the processor are included, and the processor executes the machine executable program to implement the ship plate standard plate width calculation method of any one of claims 1-8.

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