[MBDyn-users] Does MBDyn have "markers" on a part?

MBDyn users list mbdyn-users at mbdyn.org
Fri Apr 12 18:23:11 CEST 2024


Can I get some help? Please. Thanks, Aik-Siong Koh

MBDyn users list wrote:
> I understand that MBDyn constitution laws are complex and extensive.
> Can I get the specific info to get the general
> spring-damper force as (0.0 + 100.0*(rIJ(self) + (-1.0)) + 
> 10.0*vrIJ(self))
> in MBDyn to work? Thanks, Aik-Siong Koh
>
> MBDyn users list wrote:
>> Yes.  Check the "symbolic *", "nlsf *", "nlp *", and "scalar function 
>> *" families of constitutive laws. p.
>>
>> On 18/03/24 15:46, MBDyn users list wrote:
>>> Just checking if my request below is possible. Thanks, Aik-Siong Koh
>>>
>>> Aik-Siong Koh wrote:
>>>> Reinhard:
>>>>
>>>> I see MBDyn has many commands for different constitutive laws.
>>>>
>>>> Is there a way to have a general in line action-reaction force 
>>>> between MarkerI and MarkerJ which is formula based.
>>>> For example:
>>>> spring-damper force is
>>>> (0.0 + 100.0*(rIJ(self) + (-1.0)) + 10.0*vrIJ(self))
>>>> rIJ is distance between I and J of self which is the force element.
>>>> vrIJ is radial velocity between I and J.
>>>> The formula can be arbitrary functions of rIJ and vrIJ for any I 
>>>> and J pair.
>>>>
>>>> Thanks,
>>>> Aik-Siong Koh
>
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