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发表于 2007-8-26 21:33
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来自： 中国广东广州
楼上的很有钻研精神,这个问题我一直都没想过.
All the parts or objects of a ship or any other product described in Tribon are positioned in a co-ordinate system. A co-ordinate system may be local and positioned in other co-ordinate systems in hierarchies with any level of depth. However, in the end all local co-ordinate systems must be positioned relative to one global co-ordinate system that is located in the product in a well defined way.
In the case of the Tribon Hull application the product is normally a ship or a ship like vessel. In that case there are rather strict rules for how the global co-ordinate system is located (see the figure below).
The origin should be placed in the aft end of the ship, preferably in the bottom and in the symmetry plane (the Centre Line plane (=CL)). It is a good practice shown in the figure (but not necessary!) to locate the origin aft of the ship so that all x-co-ordinates are positive. Another alternative is to place the origin at the aft perpendicular.
The x-axis should be directed in the forward direction.
The y-axis should be in the direction against portside.
The z-axis should be in the upward direction (co-ordinates may be negative)
Planar parts of the hull model (e.g. plane panels, brackets, etc.) are described in the uv-plane of local co-ordinate systems (uvw). These co-ordinate systems may be located quite arbitrarily in the ship co-ordinate system (xyz) of the ship. However, when the uv-plane coincides with a principal plane of the xyz-system the local co-ordinate system is as a standard positioned as shown in the figure below. In these cases the u- and v-co-ordinates will be identical to one of the x-, y- or z-co-ordinates which may be convenient. However, this is a matter of convenience and is in no way compulsory.
The co-ordinates are (in the Tribon Hull data banks) always expressed in millimetres.
[ 本帖最后由 一江春水 于 2007-8-26 13:39 编辑 ] |
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