how to model a system which goes down grade with constant velocity

jillukevin
jillukevin Altair Community Member
edited October 2020 in Community Q&A

hi 

i have given constant velocity for the joint and have given contacts between the roller and floor .so for this model when its  goes down the slope it over rides the initial condition that i have given for the joint, that is it rolls freely as in a free fall .Is there anyway so that i can make the system run with constant velocity even on a slope with down gradient  

 

thank you 

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Answers

  • jillukevin
    jillukevin Altair Community Member
    edited July 2017

    Hi 

    Thank you I found a solution. I used the step function. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2017

    Hi,

     

    You can either use STEP function or create an expression to impose a constant velocity. 

  • jillukevin
    jillukevin Altair Community Member
    edited July 2017

    hi thank you what expression can i impose to maintain a constant velocity in the slope it seems to free fall 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi,

     

    You can use MotionSolve API 'GCON' (general constraint). Please go through the same on help for more information about GCON. 

  • jillukevin
    jillukevin Altair Community Member
    edited August 2017

    hi sorry to trouble you, this sounds too complex,i went through the help.where should iinput this function? should it be written in template,can u give me a example how it should be used.
    1.) My condition is to make the system run with a constant velocity on the slope 
    2.)how to use Gcon for the rear revolute joint in the pic so that entire system runs on a constant velocity in the slope

    lets consider angular velocity of the rear wheel to be 2 rad/sec . so that it runs with the constant velocity on the slope 

    thank you 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi,

     

    You need to create a template in MotionView. 

     

    I will check if there is any example available for the same. 

     

    If possible please share the model file you have. Use the file transfer link in my signature below to share the file. 

  • jillukevin
    jillukevin Altair Community Member
    edited August 2017

    hi prakash i have shared my files with you 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi,

     

    I shared a sample model using GCON with you. Please use that as reference and let us know whether you are able to see constant velocity while rolling. :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'> 

  • jillukevin
    jillukevin Altair Community Member
    edited August 2017

    hi prakash 

    thank you so much .That was a great work ,the example model was built with a great detail   . That model will solve my problem :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' /> 

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