Model-driven ship liquid tank capacity rapid and accurate calculation method

Abstract

The invention provides a model-driven ship liquid tank capacity rapid and accurate calculation method. The method comprises the following steps: extracting the total volume of a liquid tank; calculating the volume of the hull structure reinforcing rib; calculating the volume of cabin equipment; extracting the volume of a cabin piping system; and calculating the cabin volume, namely subtracting the volume of a ship body structure reinforcing rib, the volume of cabin equipment and the volume of a cabin piping system from the total volume of the liquid tank. According to the method, the overall profile and the cabin wall sizes in all directions of the cabin serve as input, the model is used for driving, the method is suitable for cabins of various shapes, the adaptability is higher, and the cabin capacity calculation efficiency and accuracy can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of overall ship design, and in particular relates to a model-driven method for quickly and accurately calculating the capacity of a ship's liquid tank. Background Art

[0002] In the process of ship design, as the design progresses, after the general arrangement drawing, line drawing and related structural drawings are determined, the capacity of each cabin should be accurately calculated in order to calculate the floating state and stability of the ship under various loading conditions. The size of the tank volume involves many factors, including the shape of the cabin, the shape and size of the various structures in the cabin, and the various piping systems in the cabin.

[0003] At present, the commonly used methods for calculating ship tank capacity are ship type fitting calculation methods, such as Simpson method, cubic spline, B spline, parametric spline and other methods, most of which belong to approximate evaluation and estimation methods, and the calculated errors are relatively large, which affects the overall performance design of the ship. In order to obtain a more accurate tank capacity, the designer needs to manually measure the length of the reinforcement and piping, the size of the equipment, etc., which requires a lot of manpower and material resources. Summary of the invention

[0004] In order to solve the technical problems in the prior art, the present invention provides a model-driven method for quickly and accurately calculating the tank capacity of a ship, comprising the following steps:

[0005] Total tank volume extraction;

[0006] Calculation of volume of hull structure reinforcement;

[0007] Calculation of cabin equipment volume;

[0008] Cabin piping volume extraction;

[0009] The cabin capacity is calculated by deducting the volume of the hull structure reinforcement, the volume of cabin equipment and the volume of cabin piping from the total volume of the tank.

[0010] Furthermore, the total volume extraction of the liquid tank includes: generating a closed cabin envelope by extracting each bulkhead profile of the cabin model, and obtaining the volume V1 of the liquid tank by volume measurement.

[0011] Furthermore, the volume calculation of the hull structure stiffener includes: measuring the theoretical line length of the stiffener in the cabin, and then calculating the total volume V2 of the stiffener in the cabin according to the cross-sectional area of ​​the stiffener:

[0012]

[0013] Where Li is the length of the profile inside the cabin, and Ai is the cross-sectional area of ​​the profile, which can be obtained from the profile standard or profile value table.

[0014] Furthermore, the cabin equipment volume calculation includes: extracting the volume of a single device by reading the three-dimensional model attribute information of the device, thereby obtaining the total volume V3 of the cabin equipment:

[0015]

[0016] Where V 设备 i The volume of a single device.

[0017] Furthermore, the cabin piping volume extraction includes: using the cabin envelope in step 1 and the cabin piping model to perform Boolean operations to obtain the intersection, and extracting the total volume V4 of the cabin internal piping.

[0018] Furthermore, the cabin capacity calculation includes:

[0019] Using the volumes extracted or calculated in the above operations, the tank capacity V is calculated according to the following formula:

[0020] V=V1-V2-V3-V4.

[0021] Furthermore, the above tank capacity calculation process is encapsulated in an engineering template. As long as the theoretical surface of the cabin, the stiffeners inside the cabin, the piping system and the stiffeners are picked up, the liquid tank capacity can be automatically calculated.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention proposes a method that is positive, conforms to design logic, and can quickly and accurately calculate the net capacity of a liquid tank. This method takes the overall profile and the dimensions of the bulkheads in all directions of the cabin as input and is driven by a model. It is not only applicable to cabins of various shapes, but also has stronger adaptability and can greatly improve the efficiency and accuracy of tank capacity calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of fast and accurate calculation of cabin capacity of the present invention;

[0025] Figure 2 It is a schematic diagram of the theoretical boundary of the extraction chamber of the present invention;

[0026] Figure 3 It is a schematic diagram of the theoretical space of the cabin by closing each theoretical surface of the cabin in the present invention;

[0027] Figure 4 Schematic diagram of the volume enclosed by the theoretical boundary of the cabin of the present invention;

[0028] Figure 5 This is a schematic diagram of measuring the theoretical line length of the cabin portion of the profile of the present invention;

[0029] Figure 6It is a schematic diagram of the envelope formed by the equipment in the extraction cabin of the present invention;

[0030] Figure 7 This is a schematic diagram of measuring the volume of equipment in a cabin according to the present invention;

[0031] Figure 8 It is a partial schematic diagram of the pipeline in the cabin obtained by Boolean operation of the present invention;

[0032] Fig. 9 It is a schematic diagram of the pipeline volume of the inner part of the measurement cabin of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0034] This application proposes a model-driven method for fast and accurate calculation of the tank capacity of a ship. The following examples on the 3DExperience platform are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention. Taking a tank as an example, a specific implementation description is given:

[0035] Step 1, cabin envelope volume extraction;

[0036] By extracting the bulkhead profiles of the cabin, a closed cabin envelope is generated. The volume V1( Figure 2-4 ).

[0037] Step 2, profile volume extraction;

[0038] Through the length measurement function of 3DE, the theoretical linear length of each profile in the cabin is measured, and the total volume V2 ( Figure 5 ).

[0039] Step 3, cabin equipment volume extraction;

[0040] By extracting the enclosure formed by each device in the cabin, the total volume V3 of the cabin equipment is obtained ( Figure 6-7 ).

[0041] Step 4, extracting the volume of the cabin piping system;

[0042] Use the cabin envelope in step 1 and the cabin piping model to perform Boolean operations to find the intersection and extract the total volume V4( Figure 8-9 ).

[0043] Step 5: Calculate cabin capacity.

[0044] Using the volume information extracted in steps 1-4, calculate the tank capacity V.

[0045] In summary, the above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. All equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification are within the scope covered by the patent of the present invention.

Claims

1. A model-driven method for rapid and accurate calculation of ship tank capacity, characterized in that: The following steps are involved: Total tank volume extraction; Calculation of volume of hull structure reinforcement; Calculation of cabin equipment volume; Cabin piping volume extraction; The cabin capacity is calculated by deducting the volume of the hull structure reinforcement, the volume of cabin equipment and the volume of cabin piping from the total volume of the tank.

2. The method according to claim 1, characterized in that The total volume extraction of the liquid tank includes: generating a closed cabin envelope by extracting each bulkhead profile of the cabin model, and obtaining the volume V1 of the liquid tank by volume measurement.

3. The method according to claim 2, characterized in that The volume calculation of the hull structure reinforcement ribs includes: measuring the theoretical line length of the reinforcement ribs in the cabin, and then calculating the total volume V2 of the reinforcement ribs in the cabin according to the cross-sectional area of ​​the reinforcement ribs: Where Li is the length of the profile inside the cabin, and Ai is the cross-sectional area of ​​the profile, which can be obtained from the profile standard or profile value table.

4. The method according to claim 3, characterized in that The calculation of the cabin equipment volume includes: extracting the volume of a single device by reading the three-dimensional model attribute information of the equipment, thereby obtaining the total volume V3 of the cabin equipment: Where V 设备 i The volume of a single device.

5. The method according to claim 4, characterized in that The cabin piping volume extraction includes: using the cabin envelope in step 1 and the cabin piping model to perform Boolean operations to obtain the intersection, and extracting the total volume V4 of the cabin internal piping system.

6. The method according to claim 5, characterized in that The cabin capacity calculation includes: Using the volumes extracted or calculated in the above operations, the tank capacity V is calculated according to the following formula: V=V1-V2-V3-V4.

7. The method according to claim 6, characterized in that: The above tank capacity calculation process is encapsulated in the engineering template. As long as the theoretical surface of the cabin, the reinforcement ribs inside the cabin, the piping system and the reinforcement ribs are picked up, the liquid tank capacity can be automatically calculated.

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