Jason,
Thanks for the reply,
I have started writing my proposal, But have some queries regarding the
implementation.
I have created a new submodule forces.py in sympy.mechanics module and
create force definitons in forces.py. I have included code for one of the
model here:
def linear_hooke_contact_model(stiffness, penetration):
stiffness = sm.sympify(stiffness)
penetration = sm.sympify(penetration)
force = stiffness * penetration
return [force]
Is this the write way of creating the force models, or do we need to create
classes for individual force model? Please correct me here if I'm wrong
Thanks,
Praneeth
On Wednesday, April 6, 2022 at 2:09:17 PM UTC+5:30 [email protected] wrote:
> Praneeth,
>
> We volunteer our time and will reply when and if we can.
>
> Your list of forces looks interesting and useful. I recommend reading the
> force related sections of Kane & Levinson 1985, as those would be obvious
> places to take forces ideas from. I'm currently writing a force chapter in
> my book that has some examples (these are still in draft form and likely
> incorrect): https://github.com/moorepants/learn-multibody-dynamics/pull/57
>
> There should be no need for a system or anything from pydy. We need valid
> mathematical descriptions of a variety of common forces that will work
> nicely with our code generators for efficient numerical implementations.
>
> Jason
> moorepants.info
> +01 530-601-9791 <(530)%20601-9791>
>
>
> On Tue, Apr 5, 2022 at 3:48 PM praneeth ratna <[email protected]>
> wrote:
>
>> Hi jason,
>>
>> Could you please provide your feedback on my previous two emails, So that
>> I can start writing my proposal and since there isn't much time left for
>> proposal deadline.
>>
>> Thanks,
>> Praneeth
>>
>> On Monday, April 4, 2022 at 11:38:48 AM UTC+5:30 praneeth ratna wrote:
>>
>>> Jason,
>>>
>>> Regarding the implementation, do you suggest similar to pydy engine? So
>>> we also need to create a System
>>> <https://pydy.readthedocs.io/en/stable/system.html> class similar to
>>> the one pydy has? Also could you suggest any sources for some trivial cases
>>> of muscle force, actuator force and aerodynamic force models, could you
>>> provide feedback on whether the model specified in my previous mail are
>>> useful or not, so that i can include them in my proposal.
>>>
>>> Thanks,
>>> Praneeth
>>> On Monday, March 28, 2022 at 4:22:26 PM UTC+5:30 praneeth ratna wrote:
>>>
>>>> Hi jason,
>>>>
>>>> I have at present written down the following models:
>>>>
>>>> 1. Linear hooke contact model
>>>> 2. Non linear hertz model
>>>> 3. Linear Kelvin-Voigt Contact Model
>>>> 4. Nonlinear Hunt and Crossley Contact Model
>>>> 5. Nonlinear Hunt and Crossley Contact Model
>>>> 6. Nonlinear Flores et al. Contact Model
>>>> 7. multi_mass_spring_damper()
>>>>
>>>> <https://pydy.readthedocs.io/en/stable/models.html#pydy.models.multi_mass_spring_damper>
>>>> 8. n_link_pendulum_on_cart()
>>>>
>>>> <https://pydy.readthedocs.io/en/stable/models.html#pydy.models.n_link_pendulum_on_cart>
>>>>
>>>> 7 and 8 are taken from pydy, are they non trivial cases? Also could you
>>>> suggest any resources for muscle force, actuator force and aerodynamic
>>>> force models which are useful for the user?
>>>> I have taken 1 to 6 from the here
>>>> https://www.researchgate.net/publication/299604992_Contact_Force_Models_for_Multibody_Dynamics,
>>>>
>>>> are they useful cases?
>>>>
>>>> Thanks,
>>>> Praneeth
>>>>
>>>> On Saturday, March 26, 2022 at 1:08:09 PM UTC+5:30 [email protected]
>>>> wrote:
>>>>
>>>>> Praneeth,
>>>>>
>>>>> Yes we should have a linear spring and damper force that is premade,
>>>>> but that is really just a trivial case. The GSoC project should be
>>>>> focused
>>>>> primarily on adding non-trivial forces.
>>>>>
>>>>> Jason
>>>>> moorepants.info
>>>>> +01 530-601-9791 <(530)%20601-9791>
>>>>>
>>>>>
>>>>> On Sat, Mar 26, 2022 at 7:29 AM praneeth ratna <[email protected]>
>>>>> wrote:
>>>>>
>>>>>> Hi jason,
>>>>>>
>>>>>> I have gone through the examples of pydy and your courses that you
>>>>>> have mentioned. For example: Here
>>>>>> https://pydy.readthedocs.io/en/stable/examples/mass-spring-damper.html,
>>>>>> the plan is to implement the same thing in a class so that user can call
>>>>>> the linear spring damper object whenever it is required and use
>>>>>> numerical
>>>>>> methods that can operate on force objects, is it the right thing? Also
>>>>>> is
>>>>>> there any priority for forces that should be implemented first since
>>>>>> there
>>>>>> many kinds of forces to be implemented.
>>>>>>
>>>>>> Thanks,
>>>>>> Praneeth
>>>>>>
>>>>>> On Friday, March 25, 2022 at 3:45:55 PM UTC+5:30 [email protected]
>>>>>> wrote:
>>>>>>
>>>>>>> Praneeth,
>>>>>>>
>>>>>>> Checking out examples in pydy, sympy, and my various courses (MAE
>>>>>>> 223, ENG122, ME41055) are also good locations.
>>>>>>>
>>>>>>>
>>>>>>> Jason
>>>>>>> moorepants.info
>>>>>>> +01 530-601-9791 <(530)%20601-9791>
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Mar 25, 2022 at 9:00 AM Jason Moore <[email protected]>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi Praneeth,
>>>>>>>>
>>>>>>>> I recommend looking at force types in various physics engines to
>>>>>>>> get ideas. The rest would really come from academic papers and text
>>>>>>>> books.
>>>>>>>>
>>>>>>>> Jason
>>>>>>>> moorepants.info
>>>>>>>> +01 530-601-9791 <(530)%20601-9791>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Mar 23, 2022 at 5:31 AM praneeth ratna <
>>>>>>>> [email protected]> wrote:
>>>>>>>>
>>>>>>>>> Hi all,
>>>>>>>>>
>>>>>>>>> I have already posted regarding my interest in the idea *Implementing
>>>>>>>>> Specific Forces and Torque objects *but have not recieved any
>>>>>>>>> reply yet,Could the potential mentor please guide me on what has to
>>>>>>>>> be done
>>>>>>>>> in this project and some resources, so that I can start working on my
>>>>>>>>> proposal since there isn't much time left.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Praneeth
>>>>>>>>>
>>>>>>>>> On Friday, March 18, 2022 at 12:29:04 AM UTC+5:30 praneeth ratna
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Hey!
>>>>>>>>>>
>>>>>>>>>> While going through the GSOC 2022 ideas I have come across the
>>>>>>>>>> idea of Implementing Specific Forces and Torque objects which i
>>>>>>>>>> found
>>>>>>>>>> interesting. There are many possible examples mentioned by Jason K.
>>>>>>>>>> Moore.
>>>>>>>>>> And I'm able to find a resource for contact force models :
>>>>>>>>>> https://www.researchgate.net/publication/299604992_Contact_Force_Models_for_Multibody_Dynamics
>>>>>>>>>>
>>>>>>>>>> which i found useful. Are there any resources for the examples
>>>>>>>>>> mentioned in
>>>>>>>>>> issue which can helpful for understanding the implementation of
>>>>>>>>>> concept
>>>>>>>>>> other than contact force models?
>>>>>>>>>>
>>>>>>>>>> I'm thinking of adding different classes for different type of
>>>>>>>>>> force models and torques and that can be used to create a force
>>>>>>>>>> object or
>>>>>>>>>> torque object of that type also numerical methods can be added to
>>>>>>>>>> individual classes.
>>>>>>>>>>
>>>>>>>>>> I would request Jason K. Moore to guide me on how to move forward
>>>>>>>>>> in this project, regarding the implementation and about what all
>>>>>>>>>> kinds of
>>>>>>>>>> forces and torques should be implemented so that i can start working
>>>>>>>>>> on my
>>>>>>>>>> proposal.
>>>>>>>>>>
>>>>>>>>>> Thanks,
>>>>>>>>>> Praneeth
>>>>>>>>>>
>>>>>>>>>>
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