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 On Tue, Apr 5, 2022 at 3:48 PM praneeth ratna <praneeth.ra...@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+unsubscr...@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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