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

MBDyn users list mbdyn-users at mbdyn.org
Sat Apr 13 09:49:28 CEST 2024


Dear Aik-Siong Koh,

Would it be possible for you to hard-code the initial distance "rIJ", 
which is equal to the parameter "rod_length", in your expression of the 
constitutive law?

If yes, I think that you could use a "symbolic viscoelastic" 
constitutive law. See the following sections from the manual:

Reinhard


On 12.04.24 18:23, MBDyn users list wrote:
> 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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>
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