Tuesday, October 27, 2009

Delftship Drawing Modes for Naval Architects

Delftship is light yet powerful ship design software for naval architects capable of developing hull form or ship's lines plan and calculating hydrostatic properties. In my previous post, I discussed about how to design the main deck of a yacht using extrude function of the software.
Now I am going to discuss various drawing modes which the Delftship has to visualize the ship drawings in three dimensional views. On page 14 of Delftship user manual book we can read that the computer ship design software provides five drawing modes which ship designers can use to see the fairness and the 3 dimensional forms of their design.

After designing the hull form of the yacht, I want to visualize it on computer screen in 3D views. The first view is Wireframe. This is the view which naval architects can use to see the boat or ship through its points, lines and edges. The designed ship is presented only with lines. Press Ctrl-W and you will see the yacht that looks like the following drawing

delftship-yacht-3D-1.jpg

To further explore the Delftship design capability, we can visualize our yacht in Shade drawing mode. The surfaces of our yacht will be represented in solid color, lines and curves. The submerge surfaces of the boat will have different color. Press Ctrl-F to see the boat in Shade Mode.

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Naval architects can check whether the surfaces of their design are developable or not. This can be done by pressing Ctrl-D. The boat will look like the following

delftship-yacht-3D-3.jpg

The above view is needed by the shipbuilder to see whether the hull which naval architects develop can be manufactured or not. Most of the ships' hulls have curve forms in two directions. These are also called compound curves. Naval architects need to design the hull form of the boat in a way that the surface will look green to enable plate development.

The next drawing view to visualize the yacht is the Gaussian curvature. Press the Ctrl-G, then the drawing of the boat will look like the one below:

delftship-yacht-3D-4.jpg

The Gaussian curvature is used to check the fairness of the hull. Please read page 14 of the Delftship user manual to understand more about this view. The last drawing mode is Zebra shading. To activate it, press Ctrl -E.

Computer ship design software such as Maxsurf, Delftship, Rhinoceros and Autoship are powerful in helping naval architects in visualizing their designs in 3D forms to ship owners. These software have greatly shorten the drawing or design time period naval architects usually spend when executing it manually. by Charles Roring.

Saturday, October 24, 2009

Yacht design with Delftship

The following video from Youtube shows how a racing yacht moves at sea. It uses sails as prime mover. To have a faster speed, the yacht must have smaller block coefficient with streamlined hull that minimizes water resistance.

The design of ship and boat is now easier due to the availability of such computer aided ship design software as Delftship, Maxsurf, Autoship and etc. In today's post, I am going to explain how to design the main deck of a yacht using Delftship. If you haven't got the software, just go to Delftship.net and download it. You need to register yourself first before being able to get the free version of the Delftship.
The boat that I am about to design is the default hullform given by Delftship when I first launch Delftship's new file. The principle dimension is Length: 12 meters; Beam: 3.7 meters and the draft: 0.5 meters. After launching the new file, we will get the yacht design plans as shown on the following screenshot:
yacht-design-1.jpg
Choose the Perspective view so that we can visualize our steps of hull design in 3D form.
yacht-design-2.gif
With the perspective view of the Delftship screen as the main window, while holding Ctrl key, please, click the edge of the boat. After that, highlight the Edit button. The pull-down menu will show up. Then select the Edge and click the Crease button. This will prevent the curving along the edge of the deck and the side hull.
After clicking the Crease, while the yellow line along the deck edge is still active, click the Edge again at the pull-down menu of the Edit and then select the Extrude option. You will be asked to enter some value.
yacht-design-3.jpg
Because we need to extrude the deck line to the centre line of the boat, we fill -1.75 meters as the half value of the yacht's breadth in the Transverse direction form.
yacht-design-4.jpg
As a result, we will get the following hull form in Plan View Window of the Delftship.
yacht-design-5.jpg
Now, we need to move the yellow edge of the deck line until it really in one axis as the center line. To do this, with Plan View of the Delftship Window is activated, click the Control points of the deck line while holding the CTRL key.
yacht-design-6.jpg
As you will see on the computer screen, the Delfship will show X Y Z coordinates. Fill in 0.00 in the Y form to move the points of the yellow deck line to the centerline of the yacht. When you have done it, press Enter, finally you will get the hull form of the yacht as shown below.
yacht-design-7.jpg
 
If you still haven't seen the 3D view of the boat, select Window which is located next to Help option menu. Then choose the Perspective view. After that Click the Show both sides from the pull-down menu of the Display. The remove the red lines and the control net, just click it. Now, your yacht design should look like the one above.
For those who are interested in learning yacht design, please, read Yacht Design According to Perry. It presents detailed information related to yacht. As an experienced designer, Perry explains the art and science of yacht design with many of its technical challenges in an easy to understand book. by Charles Roring

Wednesday, October 14, 2009

Naval Architecture blog in Many Languages by Google Translate

I have been running this blog since May 2007. At first, I wrote articles about anything that I encountered everyday in my daily life. After some one and a half years, I decided to focus more of my posts on such subjects as naval architecture, resistance and propulsion of ships, and marine propeller. In other words, this blog is now about ship and marine environment.
I just add Google Translate tool which you can see on the top right corner of this blog. Readers of this blog are from many countries around the world and sometimes they don't fully understand the English language which I use in writing the postst of this blog. They can just choose the language in the form and let Google Translate all the translation in seconds. I find this as one of the best tool Google provides to internet users. I hope that after adding the Google Translate tool, readers of this blog can fully enjoy the content of this blog. Thank you Google and thank you all of you for visiting and reading my writings.

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Friday, October 2, 2009

Luxurious Trimaran Boat

Luxurious yachting is a special program from Luxe TV aimed at featuring beautiful boats that have exceptional design and modern propulsion equipment. Yacht owners are mostly wealthy people. They need boats that are fast, modern, beautiful and comfortable. Naval architects who design luxurious yachts always put best quality materials for hull construction and interior rooms to create an attractive and comfortable atmosphere inside the boat. Naval architecture is the art and science of ship design. So, a yacht or a boat will be an artwork too.

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In the above picture, we can see how the designer of the trimaran designs the boat to look like an airplane. Its futuristic form makes the two balancing hulls at port and starboard sides appear similar to wings of airplane. This yacht or boat, with this kind of hull form, has high speed when operating. In addition, it is also fuel efficient due to lower water resistance properties that the boat has.

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The inside of the boat is made of wood that has smooth surface. The naval architect who designed the boat has successfully created an impression that the boat is a home. Yacht or boat owners will feel that he or she is inside a home and not just a cabin of a boat. by Charles Roring. Also read: Trimaran and Tricycle