Calculation and design of the theoretical drawing of the vessel

Contents

Job for Course Project

Source Data

Designing a Theoretical Drawing

Selecting Additional Housing Shape Characteristics and Drawing the Basic Lines of a Theoretical Drawing

Line by frames

Drawing of structural (cargo) waterline and diametrical bathox

Development of theoretical drawing housing and matching of side and half-width projections

Calculation of buoyancy and initial stability elements

Calculation of areas of waterlines, frames and displacement by design settlement

Calculation of Waterlines Elements

Calculation and plotting of buoyancy and initial stability

Bonjan Scale

Chebyshev Corps

Create equal-volume waterlines and calculate metacentric radii

Polar Chart

Static and dynamic stability diagrams

Limit volume and limit length curves of compartments

Calculation of stability according to the rules of the Russian River Register

List of literature

Application

Job for Course Project

1. Develop and build a line on frames.

2. Develop and build cargo waterline and projection side

3. Develop a theoretical drawing.

4. Calculate and construct buoyancy and initial stability curves.

5. Build a Bonjan scale.

6. Build Chebyshev building

7. Build equal-volume waterlines and calculate metacentric radii.

8. Build Polar Chart

9. Build static and dynamic stability diagrams

10. Create curve of compartment limit lengths

11. Check stability according to the rules of the River Register.

Assignment for course design in the discipline "Ship Theory"

According to the initial main dimensions, develop a theoretical drawing of the vessel and present it in a pencil on a watman or in a computer version in the form of a printout on a plotter.

Based on the results of the development of the theoretical drawing for the specified dimensions, build and present in the explanatory note the line by frames and the ordinate table of the theoretical drawing.

For the position of the vessel in the cargo, calculate the curves of buoyancy and initial stability, Bonjan scale, polar diagram, diagrams of static and dynamic stability and unsinkability and submit calculation tables and graphs according to the specified sections in the explanatory note.

Check the stability of the vessel according to the Rules of the River Register for the position in the cargo, using during the inspection the sketch of the side view of the vessel, developed on a scale on a millimeter scale, to determine the area of sailing by it and the coordinates of the center of sailing of the vessel. When developing a sketch, use vessel data from serial ship handbooks.

Development of theoretical drawing housing and matching of side and half-width projections

Having prepared the original curves of the theoretical drawing, you can begin to draw, that is, draw lines on its three projections.

The drawing of line curves on the projections of the theoretical drawing begins with the housing, since the frames better convey the nature of its strokes and, as smaller curves, are easier to reproduce. Curves on the other two projections are drawn according to the ordinates of the body and matched with each other.

The shape of the middle frame is chosen based on the requirements of processability, stability, walkability, capacity.

The deck line depends on the presence of the tank and uta (the height of the tank and uta is assumed to be 900 mm.).

The shape of the deck line in plan is consistent with the shape of the cargo waterline. On the projection, the side of the deck is depicted by two lines - the side and diameter lines of the deck, due to the death of the beams. The shape of the death of all bims is the same, but the arrow of the death of each bims depends on the width of the deck in the section under consideration.

When drawing two other projections, the projection of the body is taken as the initial one. Drawing begins with a half-latitude. Waterlines on the half-width should be carried out according to ordinates measured on the body.

Batoxes are drawn on the third projection by points obtained at a half-width at the intersection of waterlines with batoxes. After drawing curves on three projections of the theoretical drawing, you need to check whether they are consistent with each other. For this purpose points of intersection of frames with bathoxes are marked on body and transferred on projection of side. If all three projections are consistent, these control points will be on the curves of the corresponding batoxes.

Calculation of buoyancy and initial stability elements

The basis for calculation of elements of buoyancy and initial stability is the table of ordinates of frames and waterlines. Full-scale ordinate values are determined according to the theoretical drawing of the vessel and recorded with an accuracy of 102 m.

Chebyshev Corps

Chebyshev's hull is built for stability calculations at the final roll angles when used to integrate the Chebyshev rule along the length of the vessel. The scale of the Chebyshev hull is chosen so that its overall dimensions in width are 5070cm. The frames of the Chebyshev hull are built on both sides with a deck line on each frame. Often, for convenience of operation, the frames of the bow are drawn in solid lines, and the stern frames are dotted.

To build Chebyshev frames, it is necessary for the selected number (nine frames in the course project) to determine the distance of frames from the middle frame and draw their traces on the projections of the side and half-width of the theoretical drawing.

The construction of frames on the Chebyshev body is carried out according to ordinates and applicates removed from the projection side and half-width of the theoretical drawing.