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Ship objects are used to represent large navigation objects (over 25 m in length).

         

A Ship object is made up of several polygons gathered within a Group type object.

The parts that make up a ship are as follows:

•A polygon representing the base of the ship

•A polygon representing the ship's deck

•A polygon representing the bottom of the ship's superstructure

•A polygon representing the top of the ship's superstructure

•A polygon representing the ship's funnel

General principle

Ships are created by drawing two points to define the orientation of the ship.

After configuring the geometric parameters of the ship, each part of the ship (see above) is created in the graphics window and gathered in a Group object.

The ship's sources are not drawn in the graphics window.

The acoustic impact of the ship is defined by period, by means of what is called an operating mode.

An operating mode describe all of the sources present on the ship, their position and their power.

The power of the sources is entered using a reference model from the database (see Reference models).

An operating mode is therefore associated with each period.

The operating modes are stored in a database.

Impact on simulation

The ship is not just a source. It is also an object obstructing propagation.

The different parts of it can therefore cause reflections and diffractions.

The impact of the ship underwater is not taken into account in MithraSIG.