Section modulus calculation method for trepanning and reinforcement of ship lintel

Abstract

The invention belongs to the field of ship design and manufacturing, and particularly relates to a ship lintel trepanning and reinforcing profile modulus calculation method, which comprises the following steps: S1, drawing a profile view contour line of a ship lintel trepanning position in CAD (Computer Aided Design) according to a proportion of 1: 1; s2, a region connecting bridge is additionally arranged at the ship lintel hole opening position; s3, calling a CAD command REGION, and combining the profile view contour line and the connection bridge into a surface domain; step S4, calling a CAD command MASSPROP, and obtaining the centroid of the surface domain; s5, calling a CAD command UCS, and setting an original point of a CAD coordinate at the position of the mass center; and step S6, calling a CAD command MASSPROP to obtain the absolute maximum value of the bounding box Y and the moment of inertia X, and the ratio of X to Y being the section modulus. The method can effectively improve the design and proofreading calculation efficiency.

Description

Technical Field

[0001] The invention belongs to the field of ship design and manufacturing, and in particular relates to a section modulus calculation method for ship lintel opening and reinforcement. Background Art

[0002] In the field of ship engineering, the design strength of the hull structure is a key factor in ensuring the safety and reliability of the ship. As an important indicator to measure the strength of the hull structure, the calculation accuracy of the section modulus is directly related to the rationality and economy of the ship design.

[0003] The traditional hull structure strength design method has certain limitations. At present, the calculation of the hull structure section modulus is mainly through assuming the position of the neutral axis of the structural section, and then splitting the section area into regular rectangles to obtain the length and width of the regular rectangle, calculating the area of ​​each rectangle and the distance of the center of gravity from the assumed neutral axis, calculating its static moment and its own moment of inertia, and thus finding the actual position of the neutral axis of the overall section shape, and then according to the actual neutral axis position, finding the distance of the center of gravity of each section shape to the actual neutral axis, calculating the moment of inertia relative to the actual neutral axis, and then summing the own moment of inertia and the calculated moment of inertia to the neutral axis to obtain the moment of inertia of the section shape, and then dividing it by the actual neutral axis to obtain the section modulus, so as to judge the strength of the structure by the section modulus.

[0004] The above existing calculation methods of section modulus are relatively complicated, inefficient and prone to calculation errors. Summary of the invention

[0005] The purpose of the present invention is to provide a method for calculating the section modulus of a ship lintel opening and reinforcement, aiming to solve the technical problem of the complicated section modulus calculation method in the prior art.

[0006] To achieve the above-mentioned purpose, an embodiment of the present invention provides a method for calculating the section modulus of a ship lintel opening and reinforcement, comprising: step S1, drawing a section view contour line of the ship lintel opening position in CAD at a ratio of 1:1; step S2, adding a surface area connecting bridge at the ship lintel opening position; step S3, calling the CAD command REGION to merge the section view contour line and the connecting bridge into a surface area; step S4, calling the CAD command MASSPROP to obtain the centroid of the surface area; step S5, calling the CAD command UCS to set the origin of the CAD coordinates at the centroid position; step S6, calling the CAD command MASSPROP to obtain the absolute maximum value of the bounding box Y and the moment of inertia X, where the ratio of X to Y is the section modulus.

[0007] Optionally, the step S1 includes the following steps: step S1.1, drawing a cross-sectional view of the ship lintel opening position in CAD at a ratio of 1:1; step S1.2, trimming the structural lines inside the cross-sectional view and retaining only the contour lines of the ship lintel opening position.

[0008] Optionally, in step S5, the coordinate axis parallel to the ship deck is the X-axis, and the coordinate axis perpendicular to the ship deck is the Y-axis.

[0009] Optionally, the following step is further included between step S5 and step S6: calling the CAD command MASSPROP to check the characteristic information of the face region to confirm that the X-axis coordinate and the Y-axis coordinate of the centroid of the face region are both 0.

[0010] Optionally, the width of the connecting bridge is 0.1 mm.

[0011] Optionally, the ship comprises a deck, a panel and a web disposed between the deck and the panel, the web is provided with an opening, a reinforcement frame is disposed at an edge of the opening, and both ends of the connecting bridge are connected to the edges of the reinforcement frame.

[0012] Compared with the prior art, the above one or more technical solutions in the section modulus calculation method for opening and reinforcing a ship lintel provided in an embodiment of the present invention have at least one of the following technical effects:

[0013] The present invention connects the upper and lower separated sections of the lintel opening position into a complete surface area by adding a section surface area connection bridge, and then simply calculates and verifies the structural section modulus through CAD surface area information, which can effectively improve the design and proofreading calculation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a schematic diagram of the ship lintel opening and reinforcement structure in the present invention;

[0016] Figure 2 for Figure 1 The schematic diagram of the cross-sectional structure in the middle AA direction, i.e. the schematic diagram of the cross-sectional structure at the opening of the ship lintel;

[0017] Figure 3 It is a structural schematic diagram of adding a surface area behind a connecting bridge to the cross-sectional contour line of the ship lintel opening of the present invention;

[0018] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0019] Among them, the reference numerals in the figures are: deck 100, web 200, panel 300, reinforcement frame 400, reinforcement web 500, connecting bridge 600, and surface area 700. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] like Figures 1 to 4 As shown, an embodiment of the present invention provides a method for calculating the section modulus of a ship lintel opening and reinforcement, comprising:

[0025] Step S1, drawing the profile of the opening position of the ship lintel in CAD at a ratio of 1:1. This step ensures the accuracy of subsequent calculations and provides a basis for the entire design process;

[0026] Step S2, adding a surface area 700 connecting bridge 600 at the position of the opening of the ship lintel. This step realizes the integrity of the structure through the connecting bridge 600, which makes subsequent calculations possible;

[0027] Step S3, calling the CAD command REGION, merging the profile view contour line and the connecting bridge 600 into a surface region 700. This step merges multiple independent geometric elements into a whole, laying a foundation for subsequent attribute analysis;

[0028] Step S4, calling the CAD command MASSPROP to obtain the centroid of the surface area 700;

[0029] Step S5, calling the CAD command UCS, setting the origin of the CAD coordinates at the centroid position, this step ensures the correct setting of the coordinate system and provides a reference for subsequent modulus calculations;

[0030] Step S6, calling the CAD command MASSPROP to obtain the absolute maximum value of the bounding box Y and the moment of inertia X. The ratio of X to Y (ie, X / Y) is the section modulus.

[0031] It can be understood that the present invention connects the upper and lower separated sections of the lintel opening position into a complete area 700 by adding a section area 700 to connect the bridge 600, and then simply calculates and verifies the structural section modulus through the CAD area 700 information, which can effectively improve the design and proofreading calculation efficiency.

[0032] It should be noted that the CAD referred to in the present invention is computer-aided design software, including but not limited to AutoCAD software, ZWCAD software or Haochen CAD software.

[0033] Reference Figures 1 to 3 In one embodiment of the present invention, step S1 includes the following steps: step S1.1, drawing a cross-sectional view of the opening position of the ship lintel in CAD at a ratio of 1:1; step S1.2, trimming the structural lines inside the cross-sectional view, and only retaining the contour lines of the opening position of the ship lintel. Of course, the above steps can also be directly importing the cross-sectional view of the ship into CAD, and then deleting the internal lines and retaining only the contour lines.

[0034] In one embodiment of the present invention, in step S5, the coordinate axis parallel to the ship deck is the X-axis, and the coordinate axis perpendicular to the ship deck is the Y-axis, so that the directions of the X-axis and Y-axis of the ship are consistent with the directions of the X-axis and Y-axis in the CAD drawing, thereby ensuring the accuracy of the modulus calculation results.

[0035] In one embodiment of the present invention, the following step is further included between step S5 and step S6: calling the CAD command MASSPROP to check the characteristic information of the area 700 to confirm that the X-axis coordinate and the Y-axis coordinate of the centroid of the area 700 are both 0. This step can verify the centroid position, thereby ensuring the accuracy of the subsequent modulus calculation results.

[0036] In one embodiment of the present invention, Figure 3 and Figure 4 The width of the connecting bridge 600 can be set to 0.1 mm. Of course, the width of the connecting bridge 600 can be adjusted according to actual conditions. Preferably, the width of the connecting bridge 600 is as small as possible to make the error of the modulus calculation result smaller.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the ship includes a deck 100, a panel 300, and a web 200 disposed between the deck 100 and the panel 300. The web 200 is provided with an opening, and a reinforcement frame 400 is disposed at the edge of the opening. Both ends of the connecting bridge 600 are connected to the edge of the reinforcement frame 400. Furthermore, the position of the web 200 corresponding to the opening can be provided as follows: Figure 1 and Figure 2 A reinforcing web 500 is shown.

[0038] The method for calculating the section modulus of the ship lintel opening and reinforcement in the present invention specifically comprises the following steps:

[0039] Step S1.1, drawing a cross-sectional view of the opening position of the ship lintel in a 1:1 ratio in CAD;

[0040] Step S1.2, trimming the structural lines inside the section view, and only retaining the contour lines of the ship lintel opening positions;

[0041] Step S2, adding a surface area 700 connecting bridge 600 at the opening position of the ship lintel, and the width of the connecting bridge 600 is 0.1 mm;

[0042] Step S3, calling the CAD command REGION to merge the profile view contour line and the connecting bridge 600 into a surface region 700;

[0043] Step S4, calling the CAD command MASSPROP to obtain the centroid of the surface area 700;

[0044] Step S5, calling the CAD command UCS, setting the origin of the CAD coordinates at the centroid position, the coordinate axis parallel to the ship deck as the X axis, and the coordinate axis perpendicular to the ship deck as the Y axis;

[0045] Step S5.1, calling the CAD command MASSPROP to check the characteristic information of the surface region 700 to confirm that the X-axis coordinate and the Y-axis coordinate of the centroid of the surface region 700 are both 0;

[0046] Step S6, calling the CAD command MASSPROP to obtain the absolute maximum value of the bounding box Y and the moment of inertia X. The ratio of X to Y is the section modulus.

[0047] The above content is a further detailed description of the present invention in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, its architecture can be flexible and can derive a series of products. Just making a few simple deductions or substitutions should be regarded as belonging to the scope of patent protection of the present invention determined by the submitted claims.

Claims

1. A method for calculating the section modulus of ship lintel openings and reinforcements, characterized in that: include: Step S1, drawing a profile view contour line of the ship lintel opening position in a 1:1 ratio in CAD; Step S2, adding a surface area connecting bridge at the opening position of the ship lintel; Step S3, calling the CAD command REGION to merge the section view contour line and the connecting bridge into one region; Step S4, calling the CAD command MASSPROP to obtain the centroid of the surface area; Step S5, calling the CAD command UCS to set the origin of the CAD coordinates at the centroid position; Step S6, calling the CAD command MASSPROP to obtain the absolute maximum value of the bounding box Y and the moment of inertia X. The ratio of X to Y is the section modulus.

2. The method for calculating the section modulus of ship lintel openings and reinforcements according to claim 1, characterized in that: The step S1 comprises the following steps: Step S1.1, drawing a cross-sectional view of the opening position of the ship lintel in a 1:1 ratio in CAD; Step S1.2, trimming off the structural lines inside the cross-sectional view, and retaining only the contour lines of the opening positions of the ship lintels.

3. The method for calculating the section modulus of ship lintel openings and reinforcements according to claim 1, characterized in that: In step S5, the coordinate axis parallel to the ship deck is the X-axis, and the coordinate axis perpendicular to the ship deck is the Y-axis.

4. The method for calculating the section modulus of ship lintel openings and reinforcements according to claim 1, characterized in that: The following steps are also included between step S5 and step S6: The CAD command MASSPROP is called to view the characteristic information of the face region to confirm that the X-axis coordinate and the Y-axis coordinate of the centroid of the face region are both 0.

5. The method for calculating the section modulus of ship lintel openings and reinforcements according to claim 1, characterized in that: The width of the connecting bridge is 0.1 mm.

6. The method for calculating the section modulus of ship lintel openings and reinforcements according to claim 1, characterized in that: The ship comprises a deck, a panel and a web disposed between the deck and the panel, the web is provided with an opening, a reinforcement frame is disposed at an edge of the opening, and both ends of the connecting bridge are connected to the edge of the reinforcement frame.

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