On 23/01/12 00:12, Klaus Thoeni wrote:
Hi Bruno, hi Anton,
I think density scaling is not what I am looking for since I am interested in
real dynamic simulations. I need different damping parameters in
NewtonIntegrator for the block and the mesh. I have to consider free flight
under gravity so
Hi Chiara,
thanks for your comment. I am not after viscous damping either. But I think
the current implementation does exactly what I want, it's the same as the PFC
option b_damp(). So I can deactivate the damping coefficient for individual
bodies.
I can commit the code if anyone is
Ok, I understand.
I like your diff more than the previous one. :)
Still one suggestion: this additional parameter in the damping functions
is useless:
+
cundallDamp2nd(dt,m,state-angVel,angAccel,dampcoeff);
In your code, dampCoeff will be either
On Mon, Jan 23, 2012 at 10:44 AM, Chiara c.moden...@gmail.com wrote:
...
If you are not after any density scaling, why damping in NewtonIntegrator
should be acceptable in a realistic dynamic situation? Would not be
easier/more meaningful for you to implement damping inside your contact
model?
Hi guys,
thanks a lot for your suggestions. I just committed the code and I think it
looks very good now.
Klaus
On Mon, 23 Jan 2012 11:08:59 PM Bruno Chareyre wrote:
Ok, I understand.
I like your diff more than the previous one. :)
Still one suggestion: this additional parameter in the
Hi Bruno, hi Anton,
I think density scaling is not what I am looking for since I am interested in
real dynamic simulations. I need different damping parameters in
NewtonIntegrator for the block and the mesh. I have to consider free flight
under gravity so damping=0 (and I am interested in the
Hi Anton,
I just had a look at py/tests/clump.py, that's the test which fails. I added
this after line 60 (before NewtonIntegrator is called):
for b in O.bodies: print b.material
and that's what I get:
FrictMat instance at 0x1014c10
None
So the second body has no material. I think it's more
Hi Anton,
actually it is the third body and it's a clump (isClump=True). Clumps should
have a material too, shouldn't they?
Klaus
On Thu, 19 Jan 2012 06:31:09 PM Anton Gladky wrote:
Real getDampCoeff() { return material-damping; };
Can you check here a material existence?
Anton
On
Hmm, good question.
Maybe not. They consist of real spheres and those spheres should
have a material, I think.
Anton
On Thu, Jan 19, 2012 at 11:35 AM, Klaus Thoeni klaus.tho...@gmail.com wrote:
Hi Anton,
actually it is the third body and it's a clump (isClump=True). Clumps should
have a
I just creeated a clump in a real simulation , and indeed, material gives
'None'. So clumps have no material. Anyone knows why? Makes no sense to me.
Klaus
On Thu, 19 Jan 2012 09:51:38 PM Anton Gladky wrote:
Hmm, good question.
Maybe not. They consist of real spheres and those spheres should
Solved the problem by checking if it is a clump:
Real getDampCoeff() { return (!Body::isClump) ? material-damping : NaN; };
However, I think we still have to sort out why clumps don't have a material!
I will commit the code, it might be useful to have different non-viscous
damping
Could you, please, attach a diff first?
Thanks
Anton
On Thu, Jan 19, 2012 at 1:03 PM, Klaus Thoeni klaus.tho...@gmail.com wrote:
Solved the problem by checking if it is a clump:
Real getDampCoeff() { return (!Body::isClump) ? material-damping : NaN; };
However, I think we still have to
Here is the diff, effected classes Body, Material, NewtonIntegrator. Let me
know
if you are happy!
=== modified file core/Body.hpp
--- core/Body.hpp 2010-12-22 10:55:23 +
+++ core/Body.hpp 2012-01-19 11:40:50 +
@@ -68,6 +68,8 @@
int getGroupMask() {return
Hi Klaus,
1/ I don't really understand what you did and what the problem is. I
know what density scaling is (what we discussed in Barcelona iirc), but
it is not a form of damping and doesn't need anything new in materials.
Instead, it uses the per-body timestep.
2/ In order to be sure where the
(sorry for previous message, I didnt see the full discussion)
As Anton says, a clump is a collection of bodies (not only spheres), and
each of them have a material. At the clump's scale, material properties
would be useless.
Bruno
On 19/01/12 11:56, Klaus Thoeni wrote:
I just creeated a clump
Still not good Klaus sorry. Bodies without material are allowed. Your
change should not crash yade in that case.
Solved the problem by checking if it is a clump:
___
Mailing list: https://launchpad.net/~yade-dev
Post to :
One note:
if(!isnan(b-getDampCoeff())) dampcoeff=b-getDampCoeff();
I think it is not optimal to check (if(!isnan(b-getDampCoeff( on
_every_ interaction on _each_ step (performance!!!).
As I understand, you do not use damping-variable of Newtonintegrator
at all, so just set it to -1 and use
Klaus,
If what you want is to increase the timestep (because your steel-net
induces very small dt, right?), this change will not work. You need to
modify density in the good place in Newton, not damping. It can be done
by adding dscale parameter in the material class (hence no need to check
if it
Hi guys,
can anyone help me on this?
Klaus
On Thu, 12 Jan 2012 06:03:16 PM Klaus Thoeni wrote:
Hi guys,
as discussed with Bruno in Barcelona I need different non-viscous damping
coefficients for different materials. I introduced this capability by
adding a variable damping to the base
Real getDampCoeff() { return material-damping; };
Can you check here a material existence?
Anton
On Thu, Jan 19, 2012 at 8:14 AM, Klaus Thoeni klaus.tho...@gmail.com wrote:
Hi guys,
can anyone help me on this?
Klaus
On Thu, 12 Jan 2012 06:03:16 PM Klaus Thoeni wrote:
Hi guys,
as
Hi guys,
as discussed with Bruno in Barcelona I need different non-viscous damping
coefficients for different materials. I introduced this capability by adding a
variable damping to the base class material which is initialised with NaN. The
body class has a function getDampCoeff() and in
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