# Help in Software development

Discussion in 'Software' started by b1ck0, Mar 2, 2010.

1. Joined: Mar 2010
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Location: Varna/Hamburg

### b1ck0Senior Member

Hi, I am a student in Naval Architecture and Marine Engineering. Right now, I am trying to develope an application that calculates the hydrodynamic ( inertial and damping ) forces, that interact with the ship. I have interpolated the curves of Salkaev, and I have successfuly interpolated them to 6-th order polynoms. So far my application is calculating the dimentionless coefficients Lambda ( 22, 33, 24, 44 ) but I have problems in "giving them a dimension" and in integrating them for the lenght of the ship. If anyone can help, please !

I want to appology for my bad English, but it's not my native language.

2. Joined: Mar 2010
Posts: 128
Likes: 3, Points: 18, Legacy Rep: 40
Location: Varna/Hamburg

### b1ck0Senior Member

Hi again ... I've developed the application to a state, witch I can calculate added mass and damping coefficient in Heave motion. Please check my results.
http://88.213.199.107/Ship Dynamics/

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### daiquiriEngineering and Design

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### LyndonJSenior Member

What are the curves of Salkaev ? I couldn't find reference to them ?

5. Joined: Mar 2010
Posts: 128
Likes: 3, Points: 18, Legacy Rep: 40
Location: Varna/Hamburg

### b1ck0Senior Member

First Haskind has offered an analitical equations for the hydrodynamic forces. After that Salkaev solved the equations and represend the solution in a graphic form. The coefficient that you will get from the graph is dimensionless, after that you have to give it a dimension by multipling it with your ship dimensions. These curves that I upload are only for heave motion ... there are a lot of curves for Roll, Pitch and Pitch-Heave motions, there are curves for damping coefficients too ...

#### Attached Files:

• ###### salkaev.PNG
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