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Subject: Dynamics Analysis of a Rotor Shaft
Author: C.L. Lim men0cll@
Date: 2001-07-09 11:26:00Dear Every One,
Can any one help me?
I would like to apply an unbalance force, which is proportional
to square of frequency, to a rotor shaft which has a dimension of
about 1m length and 0.1m diameter. I am interested to look at the
frequency response of the rotor, when the unbalance force is
applied, as well as looking at the mode shapes. Thanks
> Thanks Steve.
> Satish Guttikonda.
> --- In xansys@y..., skgroothuis wrote:
> > Satish,
> > Normally, the best way of providing spatial-varying (or component-
> varying
> > load steps like convection coefficients) is using the following APDL
> > segment:
> > !
> > ! Define load (hf) for a particular surface(s)
> > ! as a temperature-dependent table
> > !
> > mptemp
> > p=(xpwb1*ypwb1/(2*(xpwb1+ypwb1)))*1e-03
> > *do,i,tamb,tamb+200,5
> > hcon=1.336*((i-tamb)/p)**0.25
> > hrad=epwb*5.67e-08*((i+273)+(tamb+273))*((i+273)**2+(tamb+273)**2)
> > htot=(hcon+hrad)*1e-06
> > mptemp,,i
> > mpdata,hf,21,,htot
> > *enddo
> > !
> > ! Apply h to upper pwb surface
> > !
> > nsel,s,loc,z,zpwb
> > esln,s,0
> > nsle
> > nsel,r,loc,z,zpwb
> > sf,all,conv,-21,tamb
> > You can use more than one convection coefficient sets for your
> model. I
> > (and others) have used this technique for several years with a
> great deal of
> > success.
> > Best Regards,
> > Steve Groothuis
> > Micron Technology
> > -----Original Message-----
> > From: satishchandrag@y... [mailto:satishchandrag@y...]
> > Sent: Monday, July 09, 2001 8:14 AM
> > To: xansys@y...
> > Subject: [xansys] Re: different load steps
> > Say for eg:- a TBGA package and I wish to apply different load
> steps
> > to the heat sink and card.
> > I am sorry about not including my full details.
> > Satish Guttikonda,
> > Graduate Research Associate,
> > IEEC, SUNY Binghamton,
> > Binghamton, NY 13905.
> > --- In xansys@y..., "Ceko, John (Bolton)" wrote:
> > > What do you mean by different components of the same package?
> Could
> > you
> > > explain that a little more, please?
> > > Also, it's the etiquette of the list to include your full name
> and
> > company
> > > or educational afiliation.
> > > John Ceko P. Eng.
> > > HUSKY Injection Molding Systems
> > > Index Development Engineering
> > > 560 Queen St. S.
> > > Bolton, Ontario, Canada, L7E 5S5
> > > Tel. (905) 951-5000 ext. 3347
> > > Fax (905) 951-5365
> > > Email: jceko@h...
> > > -----Original Message-----
> > > From: satishchandrag@y... [mailto:satishchandrag@y...]
> > > Sent: 2001, July 09, Monday 8:40 AM
> > > To: xansys@y...
> > > Subject: [xansys] different load steps
> > > Could someone tell me if I can apply different load steps to
> > > different components of the same package and if yes, how do I go
> > > about it.
> > > Thanks,
> > > Satish