Re: various

[dcm3c@xxxxxxx]

In a message dated 5/18/00 5:34:54 AM Eastern Daylight Time, 
rlbrambilla@xxxxxxx writes:

> These are my suggestions that, I hope, require simple modifications.
> 
> GLOBAL : a command for a custom dafault settings (units, materials etc.).
> Actually I use a template file.

Including some sort of standard (but user-modifiable) template would be a 
good idea.

> GEOMETRY : commands for inserting points and lines by keyboard. In large
> packages there are tens of this commands, most of them never used. Only two
> commands are strictly enough (but unavoidable) for the model precision :
> Point(x,y), and Line(x1,y1,x2,y2). 

You can do this already. In pretty much any situation where a specific point 
needs to be specified, you can hit the <tab> key. A dialog will pop up, 
allowing you to enter the coordinates of a point by keyboard, rather than 
having to use the mouse.

> RESULTS : similar Point and Line keyboard commands to read results and to
> paste values to the clip-board for exporting. Actually it is possible to
> paste only the field picture, but I need to export values to other programs
> for successive elaborations.
> Fine will be to have command to select the quantity I want the contour
> lines (as in actual xy-plot). 

You can get the data from an xy plot to disk by checking the "write data to 
text file" check box in the dialog where you select what sort of xy plot is 
to be created. Having an option to send it to the clipboard might be a good 
idea as well.

> And now a little remark.
> In frequency dependent problems, inserting point currents,
> I insert peak value, i.e. Io for a varying current Io exp(jwt).
> Reading the results for a selected point I find Bx, By, |B|.
> I suppose again Bx exp(jwt), By exp(jwt).
> Now your |B|=sqrt(|Bx|^2+|By|^2) and the time factor is cancelled
> by conjugation. So it may be considered an "istantaneous constant modulus".
> Usually we need the time averaged over a period so this value
> has to be divided by sqrt(2). To avoid this external operation
> I insert Ieff=Io/sqrt(2) as a point current. But in this case
> I cannot suppose Ieff exp(jwt)! So it seems to me that the output
> <|B|> = |B|/sqrt(2) and peak value insertion would be more clear.

In an attempt to be consistent and make things flow sort of "naturally" from 
the magnetostatic to harmonic cases, I have kept all results in terms of 
amplitudes, rather than RMS quantities. I might see about putting in a 
choice of "modes" for the output results, either the complex amplitudes (as 
it does now), amplitude and phase angle, or RMS quantities.

> Hoping for future improvements,
> sincerly yours Roberto 

Thanks for your comments.

-----------------------------------------

In a message dated 5/18/00 8:16:04 AM Eastern Daylight Time, 
eckart.nipp@xxxxxxxx writes:

> A difficulty is the rectangular selection tool. With that it is comparably
> troublesome to select e.g. a rotor of an asynchronous motor with all its
> slots but not any part of the stator. This is particularly hard if the
> airgap is short. Maybe an optional circular selection tool can be
> developed. Also a deselection possibility, e.g. by holding shift, would be
> useful. When playing around with a not predefined geometry also the
> possibility of moving parts per mouse may be useful.

Different selection tools might be useful. With the way that the selection 
tool currently works, you can use it multiple times to select all the parts 
of a geometry that has a more complicated shape--the previously selected 
stuff doesn't automatically get deselected.

Anyhow, a good way to analyze a rotor at different positions in the 3.0 
version is to assign all of the parts of the rotor to one "Group" as you 
build it. Then, you can select the entire rotor with just one right-click of 
the mouse when the editor is in "group" mode.

> Can the circuit property also be used to define the voltage of an exciter
> coil which is aymmetrically placed so that it is unknown in the beginning
> how the total voltage distributes on forward and backward pathes?

There's a feature that's sort of "hidden" having to do with circuit results. 
In the postprocessor, choose the View | Circuit Props selection off of the 
main menu. This allows you to see what voltage was required to impose a 
prescribed current, or how much current was obtained from an applied voltage 
for a particular circuit (as appropriate). This might allow you to get the 
information that you are after.

> Now I think I also found a bug in the group copy tool. When I chose a
> circle consiting of two 180deg arcs and copy it as a row, i.e. several
> copies at once, I get the desired circles but in addition a row of anchor
> points.

I've been able to duplicate this bug--many thanks for catching it. This was 
the sort of thing that I was hoping to have people find with this beta 
version....

> Greetings
> Eckart

Dave.
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