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Subject: Re: 2dfluxline plot over a period
Author: Ernst Haupt haupt_ernst@
Date: 2001-04-11 07:56:00

Hello dear William and dear Frank
it works fine. thanx a lot
Ernst
FH-Jena

--- William Bulat schrieb: > Hi
Ernst,

> Make linear combinations of the real and imaginary
> results sets on the
> results file using these commands:

> LCDEF
> LCFACT
> LCASE

> See also ANHARM for animating harmonic results
> variation over a period. The
> ANHARM.MAC macro file in the docu directory contains
> lines that will help
> you get results at a phase angle:

> *afun,rad
> lcdef,1,_lstp,_sub,0 ! define load case#1 to be real
> part of solution
> lcdef,2,_lstp,_sub,1 ! define load case#2 to be
> imaginary part of
> solution

> Then, if _theta is your desired phase angle with
> respect to excitation,

> real=cos(_theta) ! DEFINE AND ASSIGN FACTORS TO
> PREMULTIPLY
> REAL AND IMAGINARY RESULTS SETS
> imag=-sin(_theta)
> lcfact,1,real
> lcfact,2,imag
> *if,real,eq,0,then ! workaround: use tiny number
> for zero (ANSYS will
> replace zero with one)
> lcfact,1,1e-10
> *endif
> *if,imag,eq,0,then
> lcfact,2,1e-10
> *endif
> lcase,1 ! READ REAL PART OF SOLUTION
> (PREMULTIPLIED BY
> COS(_THETA)
> lcoper,add,2 ! ADD IMAG PART PREMULTIPLIED BY
> -SIN(_THETA)

> Now post process the resulting combined results as
> you would any other.

> Bill Bulat
> OMM Inc

> -----Original Message-----
> From: Weiand, Frank [mailto:FWeiand@d...]
> Sent: Monday, April 09, 2001 2:36 AM
> To: xansys
> Subject: [xansys] Re: 2dfluxline plot over a period

> Hi Ernst,

> I did some years ago harmonic analysises with a
> Finite Differences Code. I
> think
> the steps to get your results in Ansys will be
> similar to those in this
> 'old' Code.

> The asumption to do a harmonic calculation is to
> break down the sinusoidal
> excitation into a real und an imaginary part: u(wt)
> = RE{u * exp (iwt)}
> with t: Time, w: angular frequency (omega) , i:
> imaginary unit

> The result you get by a harmonic analysis then
> brings you two components for
> each
> field/flux value.
> To get a momentary value of eg. the fluxdensity, you
> have to calculate the
> value at
> time t0 by computing: B(t0)=Babs * [cos (w*t0) + sin
> (w*t0)]
> With Babs the absolute value of Fluxdensity
> sqrt(B_real^2 + B_imag^2). I'm
> sure there
> is a command in Ansys APDL: ABS,..,.. or so

> I think this can be done in the Ansys postprocessor
> by performing 'nodal
> calculations'.

> Hope this helps

> Frank Weiand

> Mannesmann VDO AG Email:
> fweiand@d...
> IP54TP/EMG Tel.: 06073-124291
> VDO-Stra?e 1 Fax.: 06073-124283
> D-64832 Babenhausen

> [Non-text portions of this message have been
> removed]

Posts possibly associated with message #22626AuthorDateScore
225452dfluxline plot over a periodErnst Haupt haupt_ernst@2001/04/09 
22547Re: 2dfluxline plot over a periodWeiand, Frank FWeiand@2001/04/09 
22561Re: 2dfluxline plot over a periodBill Bulat2001/04/09 
22626Re: 2dfluxline plot over a periodErnst Haupt haupt_ernst@2001/04/115