Geometric Design

Four nose surfaces are generated to model the radome as a thin layer approximation. To do that, click on Tools – Script – Load menu and load the nose_radome.nfp script that provides the internal layer of the radome. Not that the script is ready for loading it in millimetres because of its last command.

As it is not a canonical shape, we can approximate the next interfaces by scaling the original one. Use three times the command duplicate to create three additional copies of the generated shape.

The selected dimension as reference is the X-one, which has a distance to the origin of 500 millimetre, given by the e parameter (it is the a parameter, in meters, scaled to millimetres). As we need that the reference dimensions varies according to the thickness and tparameters, the scale factor is computed as the desired size divided by the original one.

Use the scale command to scale the three copies of the nose shape, each one by the corresponding factor:

Table 1.

Plane	Scale Factor
2	(e+thickness)/e
3	(e+thickness+t)/e
4	(e+(2*thickness)+t)/e

Figure 1. Command line semispheres definition

After creating the four noses, note that the base is centred at the origin of coordinates, so they must be moved to the horn.

Use the move command to move the four noses from 0 0 0 to 0 0 -100 point.

Figure 2. List of geometric entities in the tree