NEC-LIST: Commercial Announcement

In collaboration with DERA Malvern (Defence Evaluation Research
Agency), CADOE, an independent Software vendor, has implemented a
unique parameteric analysis technology into NEC2.

The method is based on finding the derivatives of quantities in the
prediction process and on the computation of an explicit function of
the solution from the high order derivatives (see attached Figure 1).
This technology provides in one iteration (one solve), all the results
corresponding to the variations in the parameters (shape design
variables, frequency, impedance).

CADOE offers an installation of this version of NEC2, parameterized in
frequency, on trial for a limited period of time, including technical
support. This version of NEC2_Param computes the RCS over a large
frequency range in one single iteration (see Figure 2). The extra
computation cost to determine the explicit function is equivalent to a
new solve for one given frequency. The parametric result shown in Fig
2 is compared to a reference solution calculated at 80 separate
frequencies.

The version of NEC_Param_Frequency is available on the following
Hardware / Operating Systems :
HP / HP-UX 10.20, SUN / SOLARIS 2.6, PC / Linux, PC / NT.

There will be a shipping and support charge of $200.
If you are interested in this Software evaluation, please contact
jerome.margat_at_cadoe.com

This was developed under contract to DERA and NEC2 has been integrated
into I-DEAS Master Series 7 (developed and marketed by SDRC, OH, USA).
With this version, the user may take advantage of the power of this
Software : definition of the geometry and mesh generation. In
addition, there is a dedicated pre-processor in order to take into
account shape design variables and impedance parameters. This version
allows analysis of the results with respect to these parameters (see
Fig 3). Finally, some enhancements in the post-processing could be
made in order to compute parametric antenna diagrams, gain factor, ...

Images :

Fig 1 :
The frequency response over the whole range is obtained from one
single solve performed at a given value of the frequency (12 GHz).

http://members.home.net/nec-list/us_methcadoe.gif

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Fig 2 :
Comparison between several solves for different values of the
frequency (reference) and the parametric solution (explicit function
obtained in one solve at one single given frequency).
http://members.home.net/nec-list/wide_band.jpg
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Fig 3 : 
For information, a sensitivity surface obtained after one single solve
showing the RCS with respect to two parameters : frequency and one
shape design variable (the equivalent of 400 solves).
http://members.home.net/nec-list/surface.gif
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