Hi Jason, I have made a draft of my proposal https://docs.google.com/document/d/13hmPNM2JdEhnMhctH5hsbuTOnA0916WUvrFOzvb98ig/edit?pli=1, Most of examples were added from here: https://github.com/moorepants/learn-multibody-dynamics/pull/57, could you please provide your feedback on my proposal since there is only 4 days left for deadline.
Thanks, Praneeth On Monday, April 11, 2022 at 10:51:13 AM UTC+5:30 praneeth ratna wrote: > Jason, > > I'm sorry for mailing again but I am not yet sure of the implementation - > 'We need valid mathematical descriptions of a variety of common forces that > will work nicely with our code generators for efficient numerical > implementations'. I do not have a clear understanding of how force should > be implemented as mentioned by you, could you please help me out here? > > Thanks, > Praneeth > > On Saturday, April 9, 2022 at 2:44:50 PM UTC+5:30 praneeth ratna wrote: > >> 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 moore...@gmail.com >> 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 <praneet...@gmail.com> >>> 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 moore...@gmail.com >>>>>> 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 <praneet...@gmail.com> >>>>>>> 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 moore...@gmail.com >>>>>>>> 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 <moore...@gmail.com> >>>>>>>>> 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 < >>>>>>>>>> praneet...@gmail.com> 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 >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>> Google Groups "sympy" group. >>>>>>>>>>> To unsubscribe from this group and stop receiving emails from >>>>>>>>>>> it, send an email to sympy+un...@googlegroups.com. >>>>>>>>>>> To view this discussion on the web visit >>>>>>>>>>> https://groups.google.com/d/msgid/sympy/f010d4bf-5986-4ac2-946f-0d306697a36cn%40googlegroups.com >>>>>>>>>>> >>>>>>>>>>> <https://groups.google.com/d/msgid/sympy/f010d4bf-5986-4ac2-946f-0d306697a36cn%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>>>> . >>>>>>>>>>> >>>>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "sympy" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to sympy+un...@googlegroups.com. >>>>>>>> >>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/sympy/d61600ae-f566-44c5-9548-ef79b5e2c423n%40googlegroups.com >>>>>>>> >>>>>>>> <https://groups.google.com/d/msgid/sympy/d61600ae-f566-44c5-9548-ef79b5e2c423n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>> . >>>>>>>> >>>>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "sympy" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to sympy+un...@googlegroups.com. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/sympy/0e43d682-13d4-4065-98fe-fceb7fd6fd5fn%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/sympy/0e43d682-13d4-4065-98fe-fceb7fd6fd5fn%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- You received this message because you are subscribed to the Google Groups "sympy" group. 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